• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A vehicle headlight comprises a reflector unit comprising a plurality of reflectors (20a, 20b, 20c) connected to each other, and base portions (30a, 30b, 30c) to which the reflectors (20a, 20b, 20c) are respectively connected a plurality of light source units (40a, 40b, 40c) arranged on the base portions (30a, 30b, 30c) for the respective reflectors (20a, 20b, 20c), a plurality of heat radiating elements (50a, 50b, 50c) arranged on the respective light source units. The base portions (30a, 30b, 30c) are provided with a plurality of heat radiation element fixing ribs (33) extending to a side opposite the reflectors (20a, 20b, 20c). The heat radiating elements (50a, 50b, 50c) are formed with a plurality of heat radiating element mounting holes (53) having a diameter greater than that of the heat radiating element fixing ribs (33). ). Each of the heat radiating element fixing ribs (33) is inserted through a respective one of the heat radiating element (53) fixing holes and thermally crimped such that a gap is formed between an inner peripheral surface of the heat radiating element fixing hole (53) and an outer peripheral surface of the heat radiating element fixing rib (33).
    公开号:FR3058501A1
    申请号:FR1760479
    申请日:2017-11-08
    公开日:2018-05-11
    发明作者:Hiroyuki Suemitsu；Yusuke Aoki；Koji Okawa
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    ® FRENCH REPUBLIC
    NATIONAL INSTITUTE OF INDUSTRIAL PROPERTY © Publication number:
    (only to be used for reproduction orders) © National registration number
    058 501
    60479
    COURBEVOIE © Int Cl 8 : F21 S 45/47 (2017.01)
    PATENT INVENTION APPLICATION
    A1
    ©) Date of filing: 08.11.17.© Priority: 08.11.16 JP 2016-218007. © Applicant (s): KOITO MANUFACTURING CO., LTD. - JP. ©) Date of availability of the request: 11.05.18 Bulletin 18/19. @ Inventor (s): SUEMITSU HIROYUKI, AOKIYUSUKE and OKAWA KOJI. ©) List of documents cited in the preliminary search report: The latter was not established on the date of publication of the request. (© References to other related national documents: ® Holder (s): KOITO MANUFACTURING CO., LTD .. ©) Extension request (s): © Agent (s): CABINET BEAU DE LOMENIE. © VEHICLE HEADLIGHT.
    heat (33).
    FR 3 058 501 - A1 (P /) A vehicle headlight comprises a reflector unit comprising several reflectors (20a, 20b, 20c) connected to each other, and basic parts (30a, 30b, 30c) to which the reflectors (20a, 20b, 20c) are connected respectively, several light source units (40a, 40b, 40c) arranged on the base parts (30a, 30b, 30c) for the reflectors (20a, 20b, 20c) respective, a plurality of heat radiating elements (50a, 50b, 50c) disposed on the respective light source units. The base portions (30a, 30b, 30c) are provided with a plurality of heat radiating element attachment ribs (33) extending to one side opposite the reflectors (20a, 20b, 20c). The heat radiating elements (50a, 50b, 50c) are formed with a plurality of heat radiating element fixing holes (53) having a diameter larger than that of the heat radiating element fixing ribs (33 ). Each of the heat radiation element fixing ribs (33) is inserted through a respective one of the heat radiation element fixing holes (53) and thermally crimped so that a space is formed between an inner peripheral surface of the heat radiating element fixing hole (53) and an outer peripheral surface of the radiating element fixing rib
    1b 20c
    Aspects of the present invention relate to a vehicle headlight, more particularly to a vehicle headlight with excellent thermal longevity.
    A vehicle headlight, for example, an automotive headlight, includes a plurality of lamps disposed in the headlight. Document JP-A-2015-46235 discloses such a vehicle headlight.
    This vehicle headlight comprises a reflector unit, a substrate on which a light emitting diode is mounted, and a heat radiation plate. The reflector unit includes a plurality of reflectors with reflective surfaces formed on base members. In each reflector, the base element is integrated by resin molding, and reflective surfaces are formed by vapor deposition of aluminum on the respective base elements. The substrate is supported by an upper surface of the reflector unit through the respective reflectors, and a plurality of light-emitting diodes corresponding to the respective reflectors is mounted on the substrate. The upper surface of the reflector unit is formed with holes for guiding the light from the light emitting diodes towards the reflective surfaces of the reflectors. In addition, on one side of the substrate opposite the surface on which the light emitting diodes are mounted, a metal plate of heat radiation is supported by means of an insulation sheet through the mounting positions of the light emitting diodes. The heat generated by each light emitting diode mounted on the substrate is radiated through the heat radiation plate. If a relative position between the substrate, on which the light emitting diodes are mounted, and the reflectors is not aligned, it is difficult to obtain the desired light distribution, and if the substrate and the radiation plate of heat are separated from each other, there are problems due to heat from the light emitting diodes. Therefore, although it is not explicitly described in JPA-2015-4 6235, in general, the reflector unit, the substrate, and the heat radiating plate are fixed to each other by screws. In addition, in a typical vehicle headlight, similar to the vehicle headlight in JP-A-2015-46235, the reflector unit includes a base member made of resin, and the heat radiating plate is made of metal . On the other hand, in general, the resin and the metal have different coefficients of thermal expansion, and the metal has a higher rigidity than the resin.
    In the vehicle headlight of document JP-A-201546235, the heat radiation plate is arranged on the reflector unit, in which the reflectors are integrated with each other, via the substrate and insulating sheet. As described above, the heat radiating plate is arranged through the mounting positions of the respective light emitting diodes, so that the heat radiating plate is arranged through the respective reflectors. [0007] At the same time, in a vehicle headlight, the temperature of the ambient atmosphere in the vehicle headlight may increase due to the heat generated by a lighting circuit or the heat transferred from a motor in addition to the heat generated by light emitting elements such as light emitting diodes. If the thermal conductivity of the reflector unit differs from that of the heat radiating plate and the heat radiating plate has higher rigidity than the reflector unit, when the temperature of the vehicle headlight rises, stress is generated on the reflector unit due to the difference in coefficients of thermal expansion between the reflector unit and the heat radiating plate.
    [0008] It is therefore an aspect of the present invention to provide a vehicle headlight with excellent thermal durability.
    According to one embodiment of the present invention, there is provided a vehicle headlight comprising: a reflector unit comprising a plurality of reflectors connected to each other, and base parts to which the reflectors are connected respective way; a plurality of light source units disposed on the base portions for the respective reflectors; a plurality of heat radiation elements disposed on the respective light source units, wherein the base portions are provided with a plurality of heat radiation element attachment ribs extending to one side opposite to the reflectors, in which the heat radiating elements are formed with a plurality of fixing holes for the radiating heat element having a diameter larger than that of the ribs for fixing the radiating heat element, and wherein each of the heat radiating element fixing ribs is inserted through the respective hole of the heat radiating element fixing holes and thermally crimped so that a space is formed between a surface inner peripheral of the heat radiating element fixing hole and an outer peripheral surface of the radiating element fixing rib heat supply.
    When light is emitted from the light source unit, the light source unit tends to generate heat. The heat is transferred to a heat radiating element disposed on the light source unit and is radiated from the heat radiating element. On the other hand, the reflector unit and the heat radiating element are generally made of different materials, as described above. For example, as in JP-A2015-46235, the reflector unit is made of resin, and the heat radiating element is made of metal. Thus, the reflector unit and the heat radiating element made of different materials tend to have different coefficients of thermal expansion from each other. Therefore, when the temperature of the reflector unit and the heat radiating element increases due to the heat generated by the light source unit, the reflector unit and the heat radiating element expand with different expansion rates. Even when the reflector unit and the heat radiating element have the same coefficient of thermal expansion, the reflector unit and the heat radiating element may expand at different expansion rates due to a difference in temperature between the reflector unit and the heat radiating element. According to the vehicle headlight having the above configuration, the elements of the plurality of heat radiating elements are arranged individually at each of the light source units disposed at each reflector. Therefore, even when the reflector unit expands thermally, and the distance between the reflectors increases, a change in the relative position between the reflectors and the heat radiating elements arranged for the reflectors can be suppressed. In addition, a heat radiation element fixing rib extending from the base part is inserted through the heat radiation element fixing hole of the heat radiation element and thermally crimped. above, so as to fix the heat radiating element. The diameter of the heat radiation element fixing rib is smaller than the diameter of the heat radiation fixing hole. Even in the thermally crimped state, a space is formed between the inner peripheral surface of the heat radiating element fixing hole and the outer peripheral surface of the heat radiating element fixing rib. Therefore, in a thermally crimped state, while movement of the heat radiating elements in the direction of extension of the heat radiating element fixing ribs is limited, there is room for a movement in a direction perpendicular to the direction of extension. Therefore, even when the reflector unit and the heat radiating elements expand with different coefficients of thermal expansion, since the heat radiating element fixing ribs which fix the heat radiating elements are movable in the heat radiating element fixing holes, a constraint on each of the reflectors can be removed.
    In addition, the temperature of the reflector unit increases due to the heat generated by the light source unit and the distance between the reflectors tends to increase. According to the vehicle headlight having the vehicle headlight having the above excellent durability, since the light source unit is disposed at each of the reflectors, a change in the relative positions between the reflector and the The light source unit arranged thereon can be suppressed even as the distance between the reflectors increases.
    Therefore, above thermal configuration.
    In the above, the thermal conductivity of the heat radiating element can be greater than the thermal conductivity of the reflector unit. Thermal crimping refers to a state where the heat radiating element fixing rib which protrudes from the heat radiating element fixing hole is deformed by applying heat to have the diameter larger than that of the heat radiating element fixing hole. Therefore, since the thermal conductivity of the heat radiating element is greater than the thermal conductivity of the reflector unit, the heat for the deformation of the heat radiating element fixing rib at the time of crimping heat is mainly transferred to the heat radiating element. Therefore, deformation of the reflector unit can be suppressed when the heat radiating member is attached to the reflector unit. In the foregoing, the base parts may be provided with a plurality of light source unit fixing ribs extending to the side opposite to the reflectors, the light source units may be formed with a plurality of light source unit fixing holes having a diameter larger than a diameter of the light source unit fixing ribs, and each of the light source unit fixing ribs light can be inserted through the respective hole of the light source unit fixing holes and thermally crimped so that a space is formed between an inner peripheral surface of the light source unit fixing hole and an outer peripheral surface of the light source unit fixing rib.
    The reflector unit and the light source unit are generally made of different materials. For example, in a case where the light source unit comprises a light emitting element and a substrate on which the light emitting element is mounted, and the substrate is made of metal, ceramic, or equivalent, the light source unit tends to have a different coefficient of thermal expansion than that of the reflector unit. In this case, when the temperatures of the reflector unit and the light source unit rise, the reflector unit and the light source unit tend to expand with different expansion rates, and even when the reflector unit and the light source unit have the same coefficient of thermal expansion, they can expand with different expansion rates due to a temperature difference between the reflector unit and the light source unit. According to the vehicle headlight having the above configuration, the light source unit fixing rib is inserted into the light source unit fixing hole which has a larger diameter than that of the fixing rib light source unit and then thermally crimped so that a space is formed between the inner peripheral surface of the light source unit fixing hole and the outer peripheral surface of the light fixing rib light source unit, so that the light source units are fixed to the reflector unit. Therefore, in a thermal crimp state, while movement of the light source units in the direction of extension of the light source unit fixing ribs is limited, there is room for movement in a direction perpendicular to the direction of extension. Therefore, even when the reflector unit and the light source units expand with different coefficients of thermal expansion, since the light source unit fixing ribs are movable in the light unit fixing hole light source, a constraint on the reflectors can be removed. Consequently, the vehicle headlight having this configuration is even higher in thermal longevity.
    The light source units can be formed with a plurality of light source unit fixing holes having a diameter larger than that of the heat radiating element fixing ribs in positions which overlap the heat radiation element fixing holes, and the heat radiation element fixing ribs can be inserted through the light source unit fixing holes.
    Therefore, by fixing the light source unit with the heat radiating element fixing rib, it is possible to reduce the number of ribs and have a simple configuration. In addition, each of the light source units may include a light emitting element and a substrate on which the light emitting element is mounted, and the light source unit fixing holes can be formed in the substrate.
    As described above, according to the above configuration, it is possible to provide a vehicle headlight with excellent thermal longevity.
    The above and other aspects of the present invention will become more evident and will be more readily appreciated from the following description of illustrative embodiments of the present invention made in conjunction with the accompanying drawings, wherein :
    Figure 1 is a front view of a vehicle headlight according to a first embodiment of the present invention;
    Figure 2 is a sectional view along line II - II of Figure 1;
    Figure 3 is an exploded perspective view of a lamp unit of Figure 1;
    Figure 4 is a plan view of a base portion on which a light source unit and a heat radiating member are arranged;
    Figure 5 is a sectional view showing a state of thermal crimping of a heat radiating element fixing rib;
    Fig. 6 is a sectional view showing a state of thermal crimping of a light source unit fixing rib;
    Figures 7A to 7C are diagrams showing a light distribution; and
    Figure 8 is a view showing a lamp unit of a vehicle headlight according to a second embodiment of the present invention, similar to the figure
    3.
    A vehicle headlight according to embodiments of the present invention will be described below with the accompanying drawings. The embodiments described below are to facilitate understanding of the present invention and are not intended to limit the present invention. The present invention can be modified and improved from the following embodiments without departing from the objective thereof.
    (First embodiment)
    Figure 1 is a front view of a vehicle headlight according to a first embodiment. The vehicle headlight 1 according to this embodiment is provided to the left and to the right of a front of a vehicle. The left and right headlights of the vehicle are configured to be approximately symmetrical in the left-right direction. Therefore, in the present embodiment, one of the vehicle headlights will be described.
    Figure 2 is a sectional view along line II - II of Figure 1. As shown in Figures 1 and 2, the vehicle headlight 1 includes a housing 10 and a lamp unit LU housed in the housing 10. Although this is not shown in FIGS. 1 and 2, the vehicle headlight 1 comprises concealing elements intended to hide unnecessary parts of the lamp unit LU when the vehicle headlight 1 is seen forward.
    The housing 10 mainly comprises a lamp housing 11, a front cover letting the light 12 pass, and a rear cover 13. The front of the lamp housing 11 has an opening, and the cover letting the light pass 12 is fixed to the lamp housing 11 so as to close the opening. In addition, the rear of the lamp housing 11 has a smaller opening than the front opening, and the rear cover 13 is fixed to the lamp housing 11 so as to cover the rear opening.
    The space formed by the lamp housing 11, the cover 12 which covers the front opening of the lamp housing 11, and the rear cover 13 which covers the rear opening of the lamp housing 11 is called the lamp chamber LR, and the LU lamp unit is housed in the LR lamp chamber.
    Figure 3 is an exploded perspective view of the LU lamp unit shown in Figure 1. As shown in Figures 1 and 3, the LU lamp unit comprises a plurality of lamps 1a, 1b , the arranged side by side. The lamp 1a mainly comprises a reflector 20a, a base portion 30a connected to the reflector 20a, a light source unit 40a disposed on the base portion 30a, and a heat radiating element 50a disposed on the light source unit. light 40a. The lamp 1b mainly comprises a reflector 20b, a base portion 30b connected to the reflector 20b, a light source unit 40b disposed on the base portion 30b, and a heat radiating element 50b disposed on the light source unit. light 40b. The lamp comprises mainly a reflector 20c, a base portion 30c connected to the reflector 20c, a light source unit 40c disposed on the base portion 30c, and a heat radiating element 50c disposed on the source unit. light 40c.
    The reflector 20a and the reflector 20b are connected to each other, and the reflector 20b and the reflector 20c are connected to each other. In addition, the base part 30a and the base part 30b are connected to each other with a predetermined difference in height between them, and the base part 30b and the base part 30c are connected to each other. the other with a predetermined height difference between them. In this way, the reflector 20a, the reflector 20b, and the reflector 20c are connected to each other, thereby forming a reflector unit RU having a plurality of reflectors and base parts to which the respective reflectors are connected .
    In the present embodiment, each of the lamps 1a, 1b, has approximately the same configuration. Therefore, the reflector 20a, the reflector 20b, and the reflector 20c have approximately the same configuration; the base portion 30a, the base portion 30b, and the base portion 30c have approximately the same configuration; the light source unit 40a, the light source unit 40b, and the light source unit 40c have approximately the same configuration; and the heat radiating element 50a, the heat radiating element 50b, and the heat radiating element 50c have approximately the same configuration. Therefore, the following explanation is made with the lamp lb as an example.
    The reflector 20b comprises a main reflector body 21 and a plated part 23. The main reflector body 21 is made of resin and is divided into a plurality of reflective bearings with a difference in height between the reflective bearings. The plated portion 23 is formed by metal plating of the surface on the front side (front cover side 12) of the main reflector body 21. The surface of the plated portion 23 is made to be a light reflecting surface 23r.
    The reflective surface 23r is formed in a concave shape having a free-curved surface based on a parabola whose opening direction is on the front side. More specifically, the shape of the reflecting surface 23r in the vertical cross section is approximately the shape of a parabola lower than the top thereof, and the shape of the reflecting surface 23r in the horizontal cross section is approximately the shape of a parabola including the top of it. The shape of the dish in the vertical cross section of the reflecting surface 23r and the shape of the dish in the horizontal cross section may be different. In addition, the shape of the reflecting surface 23r in the horizontal cross section may not be a shape based on a parabola, and may be, for example, a shape based on a part of an ellipse or other concave shape. . In the present embodiment, the reflecting surface 23r is formed in a concave shape having a free-form surface based on a parabola with bearings formed thereon.
    A reinforcing element 29 is connected to the rear surface of the main reflector body 21, and a deformation of the reflector 20b is eliminated by the reinforcing element 29.
    The resin forming the main reflector body 21 can be polycarbonate (PC), an unsaturated polyester resin (BMC), or equivalent. The metal forming the plated part 23 can be nickel, chromium, aluminum, or the like. For example, the coefficient of linear expansion of polycarbonate is from 70xl0 ~ 6 to 80χ10 ~ 6 [/ K]. Since the layer thickness of the clad portion 23 is small, the coefficient of linear expansion of the main reflector body 21 is dominant in the coefficient of linear expansion of the entire reflector 20b.
    The base part 30b is an element made of resin with an approximately flat plate shape and has an opening 30H. The base part 30b is connected to the main reflector body 21 by integral molding. In addition, a plurality of heat radiating element fixing ribs 33 is provided on the upper surface of the base portion 30b on the side opposite the reflector 20b. In the present embodiment, three heat radiating element attachment ribs 33 are provided. In addition, a plurality of light source unit fixing ribs 34 is provided on the upper surface of the base portion 30b. In the present embodiment, two light source unit fixing ribs 34 are provided. The heat radiating element fixing rib 33 and the light source unit fixing rib 34 extend on the side opposite to the reflector 20b.
    In addition, on the upper surface of the base 30b, a plurality of protrusions for positioning the heat radiation element 35 is provided around each of the heat radiation element fixing ribs 33. In the In this embodiment, three protruding parts for positioning the heat radiating element 35 are provided around each of the ribs for fixing the radiating heat element 33. The protruding protruding part for the heat radiating element 35 is provided. an element for arranging the heat radiating element 50b (described later), and the position of the heat radiating element 50b in the height direction is determined by the radiating element positioning projection of heat 35.
    On the upper surface of the base part 30b is provided a plurality of light source unit positioning protrusions 36. In the present embodiment, three light source unit positioning protrusions 36 are provided on the base part 30b. As will be described later, the light source unit positioning portion 36 is a member for arranging the light source unit 40b, and the position of the light source unit 40b in the direction height is determined by the light source unit positioning projection 36.
    The heat radiating element fixing rib 33, the light source unit fixing rib 34, the heat radiating element positioning protrusions 35, and the positioning radiating protrusions d the light source unit 36 is made of resin and fixed to the base part 30b by integral molding.
    The rear side of the reflector 20b is arranged with a CN connector to which is connected a cable for the power supply of the light source unit 40b. Although not specifically shown, the CN connector is connected to the RU reflector unit.
    The reflector 20a, the reflector 20b, and the reflector 20c are connected to each other by integral molding of each of the main body of the reflector 21, and the base part 30a, the base part 30b, and the base part 30c are also connected to each other by integral molding as described above. The light source unit 40b mainly comprises a substrate 41 and a light emitting element 42.
    The substrate 41 is a flat circuit board and is made of metal, ceramic, epoxy glass or equivalent. When the substrate 41 is made of metal, wiring and terminals of electronic components disposed on the substrate 41 are isolated from the substrate 41. A plurality of light source unit mounting holes 44 are formed in the substrate 41. positions of these light source unit fixing holes 44 overlap the positions of the light source unit fixing ribs 34 in plan view when the substrate 41 is disposed on the base portion 30b of the light unit RU reflector. The diameter of the light source unit fixing hole 44 is larger than the diameter of the light source unit fixing rib 34. For example, it is preferable that the diameter of the unit source fixing hole light source 44 is larger than the diameter of the light source unit fixing rib 34 by 0.03 mm or less. The reason for this is as follows. That is, the light distribution changes when the relative position between the light source unit 40b and the reflector 20b changes. Therefore, it is preferable that, when the reflector 20b expands, the light source unit 40b follows the reflector 20b as close as possible. The lamp unit fixing hole 44 determines the position of the lamp unit 40b. On the other hand, it is preferable that a space is formed between the outer peripheral surface of the light source unit fixing rib 34 and the inner peripheral surface of the light source unit fixing hole 44 in view of having the light source unit fixing rib 34 movable in a direction perpendicular to a direction of extension thereof. Therefore, from the point of view of the light distribution requirement and the slight movement of the light source unit fixing rib 34, the diameter of the light source unit fixing hole 44 is preferably larger than the diameter of the light source unit fixing rib 34 in the range above. Note that the shape of the light source unit mounting hole 44 is not limited to a circular shape and may be a shape of a running track, for example. In this case, it is preferable that the largest and smallest diameters of the race track shape fall within the above range.
    The light emitting element 42 is disposed on a surface of the substrate 41. The light emitting element 42 is configured by, for example, the light emitting diodes, and the light emitting surface of the light emitting element 42 is on the side opposite the substrate 41.
    The light source unit 40b is arranged on the base part 30b so that the light emitting element 42 is exposed from the opening 30H of the base part 30b. At this time, the light source unit fixing ribs 34 are inserted through the respective light source unit fixing holes 44, and the substrate 41 is in contact with the positioning projections d the light source unit 36 of the base portion 30b. Therefore, the position of the light source unit 40b in the direction along the upper surface of the base portion 30b is determined by the light source unit fixing rib 34, and the position of the the light source unit 40b in the direction perpendicular to the upper surface of the base portion 30b is determined by the light source unit positioning projection 36.
    The heat radiating element 50b is formed by folding a single sheet of metal approximately vertically and comprises an upper plate 51 and a rear plate 52 which are perpendicular to each other. Examples of the metal which forms the heat radiating element 50b include aluminum, copper, iron or the like. The coefficient of linear expansion of aluminum at 25 ° C is 23xl0 -6 [/ K]. In general, since a metal has a higher thermal conductivity than that of the resin, the thermal conductivity of the heat radiating element 50b is higher than the thermal conductivity of the reflector unit RU. For example, in the case where the RU reflector unit is mainly made of resin as described above, the thermal conductivity of the polycarbonate is 0.18 [W / mK], and the thermal conductivity of the aluminum at approximately 27 ° C is 237 [W / mK].
    The upper plate 51 is formed with a plurality of heat radiating element fixing holes 53. When the upper plate 51 of the heat radiating element 50b is disposed on the base portion 30b of the reflector unit RU, the positions of the heat radiation element fixing holes 53 overlap the positions of the heat radiation element fixing ribs 33 in the plan view. The diameter of the heat radiation element fixing hole 53 is larger than the diameter of the heat radiation element fixing rib 33. For example, it is preferable that the diameter of the element heat fixing hole heat radiation 53 is larger than the diameter of the heat radiation element fixing rib 33 from 0.4 to 0.5 mm. With such a size, for example, in a general size vehicle headlight, when the main reflector body 21 is made of polycarbonate and the heat radiating element 50b is made of aluminum as described above, the stress applied to the reflector 20b can be sufficiently removed (this will be described later). The shape of the heat radiating element fixing hole 53 is not limited to a circular shape and may be a shape of a running track, for example. In this case, it is preferable that the largest and smallest diameters of the race track shape fall within the above range.
    The top plate 51 is formed with a plurality of light source unit fixing rib insertion holes 54. The positions of these light source unit fixing rib insertion holes 54 overlap the light source unit fixing ribs 34 in the plan view when the top plate 51 of the heat radiating element 50b is disposed on the base portion 30b of the reflector unit RU. The diameter of the light source unit fixing rib insertion hole 54 is larger than the diameter of the light source unit fixing rib 34. For example, it is preferable that the diameter of the hole Insertion of light source unit fixing rib 54 is larger than the diameter of the light source unit fixing rib 34 from 0.2 to 0.4 mm. The shape of the light source unit mounting rib insertion hole 54 is not limited to a circular shape and may be, for example, a race track shape similar to the shape of the mounting hole d heat radiating element 53. In this case, it is preferable that the largest and smallest diameters of the race track shape fall within the above range. The rear plate 52 is an element positioned on the rear side of the reflector 20b in a state where the upper plate 51 is disposed on the base part 30b of the reflector 20b. The rear plate 52 is formed with an approximately rectangular opening 52H which is in contact with the edge of the upper plate 51. The opening 52H is configured to connect a cable (not shown) to the connector CN.
    The heat radiating element 50b is disposed on the light source unit 40b in a state where the light source unit 40b is disposed on the base portion 30b as described above. above. At this time, in the present embodiment, a heat transfer layer 60 is disposed between the top plate 51 and the light source unit 40b. The heat transfer layer 60 is a layer that transfers heat by filling a space between the top plate 51 and the substrate 41. The heat transfer layer 60 can be heat transfer grease, a heat transfer sheet. heat with flexibility, or equivalent. Unlike the present embodiment, the heat transfer layer 60 can be omitted and the substrate 41 and the top plate 51 can be in direct contact with each other. In a state where the heat radiating element 50b is disposed on the light source unit 40b, the heat radiating element fixing ribs 33 are inserted through the radiating heat element fixing holes heat 53, respectively, and the light source unit fixing ribs 34 are inserted into the light source unit fixing rib insertion holes 54 of the top plate 51, respectively. At this time, the upper plate 51 abuts on each of the heat radiating element positioning protrusions 35 of the base part 30b, and the substrate 41 is clamped between the base part 30b and the upper plate 51 As described above, the heat transfer layer 60 is interposed between the substrate 41 and the top plate 51. Therefore, the position of the heat radiating element 50b along the top surface of the base part 30b is determined by the heat radiating element fixing ribs 33, and the position of the heat radiating element 50b in the direction perpendicular to the upper surface of the base part 30b is determined by the heat radiating element positioning projections 35.
    Figure 4 is a plan view of the base portion 30b in a state where the light source unit 40b and the heat radiating element 50b are disposed on the base portion 30b. In Figure 4, for ease of understanding, the light source unit 40b is indicated by dashes, and the heat radiating element 50b is indicated by a dashed line. As shown in Figure 4, the light source unit 40b is covered with the top plate 51 of the heat radiating element 50b. In addition, in the present embodiment, the heat radiating element attachment ribs 33 on the right and left enclose the light source unit 40b. In other words, the distance between the radiating element fixing ribs provided so that adjacent heat 33 is the thermal heat radiating fixing ribs. The figures of the heat radiating element source unit 33 are arranged on the outer side of the light source unit 40b.
    In a state where the light source unit 40b and the heat radiating element 50b are arranged on the base part 30b as described above, the light source unit 40b and the element 50b are fixed by crimping 1, 3 and 4 show a state where light 40b and the heat radiating element 50b are arranged on the base part 30b but not crimped thermally. The thermal crimping of the present embodiment will be described with reference to Figures 5 and 6. Figure 5 is a sectional view showing a crimping state
    thermal of the rib of fixation of element of radiation of heat 33. In Figure 5, the state of the rib of fixation of element of radiation heat 33
    before thermal crimping is indicated by dashes. Thermal crimping softens an end portion 33t of the heat radiation element fixing rib 33 which protrudes from the heat radiation element fixing hole 53 by heating the end part 33t to form a flange 33f having a diameter larger than the diameter of the heat radiating element fixing hole 53 so that the heat radiating element fixing rib 33 is prevented from coming out of the heat radiating element fixing hole heat radiation 53 by the edge portion 33f. In the present embodiment, a small space is formed between the inner peripheral surface of the heat radiation element fixing hole 53 and the outer peripheral surface of the heat radiation element fixing rib 33 in the a state where the heat radiating element fixing rib 33 is crimped thermally. The heating time and temperature are appropriately set during the thermal crimping process to achieve the above state. "Thermal crimping" is a form of "crimping", and the phrase "is crimped thermally" can indicate the process of thermal crimping or condition after thermal crimping is performed.
    Therefore, the heat radiating element fixing ribs 33 are inserted through the heat radiating element fixing holes 53 and crimped thermally, so that the radiating element heat 50b is fixed on the base part 30b. A small space is formed between the inner peripheral surfaces of the heat radiation element fixing holes 53 and the outer peripheral surfaces of the heat radiation element fixing ribs 33. Therefore, the heat radiation element 50b is attached to the base portion 30b in a state where the heat radiating member 50b is prevented from moving in the direction perpendicular to the upper surface of the base portion 30b and is slightly movable in the direction along the upper surface of the base portion 30b.
    Figure 6 is a sectional view of a state of thermal crimping of the light source unit fixing rib 34. As shown in Figure 6, the source unit fixing ribs light 34 of the light source unit 40b are inserted through the light source unit fixing holes 44 of the substrate 41 and the light source unit fixing rib insertion holes 54 of the heat radiating element 50b, and then crimped thermally, so that the light source unit 40b is fixed to the base portion 30b. In the present embodiment, the end portion 34t of the light source unit fixing rib 34 (shown by dashes) which protrudes from the light source unit fixing rib insertion hole 54 (toward the side opposite the substrate 41) is softened by heating to form a flange portion 34f having a diameter larger than the diameter of the light source unit fixing rib insertion hole 54 The rim portion 34f prevents the light source unit fixing rib 34 from coming out of the light source unit fixing rib insertion hole 54. Thus, as a result of the radiating element which is fixed, the light source unit 40b is fixed. That is, the light source unit 40b is fixed by thermal crimping of the light source unit fixing ribs 34 through the heat radiating element 50b. As described above, the diameter of the light source unit fixing hole 44 is larger than the diameter of the light source unit fixing rib 34, and the light source fixing rib light source unit 34 is thermally crimped so that a small gap is formed between the outer peripheral surface of the light source unit fixing rib 34 and the inner peripheral surface of the fixing hole light source unit 44. Therefore, in a similar manner to the heat radiating member 50b, the light source unit 40b is fixed to the base portion 30b in a state where the source unit light 40b is prevented from moving in the direction perpendicular to the upper surface of the base portion 30b and is slightly movable in the direction along the upper surface of the base portion 30b. In addition, the diameter of the light source unit fixing rib insertion hole 54 is larger than the diameter of the light source unit fixing rib 34, and the unit fixing rib light source 34 is thermally crimped such that a small gap is formed between the outer peripheral surface of the light source unit fixing rib 34 and the inner peripheral surface of the light fixing rib light source unit 34. Thus, limiting the slight movement of the heat radiating element 50b by the light source unit fixing ribs 34 in the direction along the upper surface of the base portion 30b is deleted.
    Unlike the present embodiment, without forming the light source unit fixing rib insertion holes 54 in the heat radiating element 50b, the unit fixing ribs light source 34 may be inserted through the light source unit mounting holes 44 and be crimped thermally to secure the light source unit 40b before positioning the light member
    radiation of heat 50b. In this case, the part of ledge of the fixing rib unity of source of light 34 East positioned Between Unity of source of
    light 40b and the heat radiating element 50b. The operations and effects of the vehicle headlight 1 of this embodiment will then be described.
    As described above, the vehicle headlight 1 according to the present embodiment comprises: the reflector unit RU having the plurality of reflectors 20a, 20b, 20c connected to each other and the base parts 30a, 30b, 30c to which the respective reflectors are connected respectively; the plurality of light source units 40a, 40b, 40c disposed on the respective base portions for the reflectors; and the plurality of heat radiating elements 50a, 50b, 50c disposed on the respective light source units. The base portions 30a, 30b, 30c are provided with the plurality of heat radiating element fixing ribs 33 extending on the side opposite to the reflectors, and the heat radiating elements 50a, 50b, 50c are formed with a plurality of heat radiation element fixing holes 53 having a diameter larger than that of the heat radiation element fixing ribs 33. Next, each of the heat radiation element fixing ribs 33 is inserted through the respective heat radiation element fixing holes 53 and thermally crimped so that a space is formed between the inner peripheral surface of the heat radiation element fixing hole 53 and the outer peripheral surface of the heat radiating element fixing rib 33.
    In the vehicle headlight 1, when light is emitted from the light source units 40a, 40b, 40c, the light is reflected by the reflecting surfaces 23r of the reflectors 20a, 20b, 20c, passes through the cover 12 and is irradiated with a desired light distribution. Figures 7A to 7C are diagrams showing the light distribution. For example, if some or all of the lamps 1a to 1 are low beams and low beam irradiation is performed, the light distribution shown in Fig. 7A is formed. In addition, for example, in the case where part of the lamps la to le are low beams and the others are high beams and a high beam irradiation is carried out in addition to the low beam irradiation, the light distribution shown in Figure 7B is formed. In addition, if some of the lamps 1a to 1 are daytime running lights and light for the daytime lighting is irradiated, the light distribution shown in Fig. 7C is formed.
    At this time, the light source units 40a, 40b, 40c tend to generate heat. The heat is transferred to the heat radiating elements 50a, 50b, 50c disposed on the light source units 40a, 40b, 40c and is radiated from the heat radiating elements 50a, 50b, 50c. However, due to the heat from the light source units 40a, 40b, 40c, the heat generated by the lighting circuits for the ignition of the light source units 40a, 40b, 40c, the heat transferred from an engine, or equivalent, the ambient temperature in the LR lamp chamber could rise. The heat in the lamp chamber LR is transferred to the reflector unit RU, and the reflector unit RU tends to thermally expand. Even in the case where the distance between the reflectors increases due to the thermal expansion of the reflector unit RU, in the vehicle headlight 1 of the present embodiment, since the plurality of source units of light 40a, 40b, 40c is arranged on the respective reflectors 20a, 20b, 20c, it is possible to suppress changes in the relative positions between the reflectors 20a, 20b, 20c and the light source units 40a, 40b, 40c arranged on the reflectors 20a, 20b, 20c. In addition, since the plurality of heat radiating elements 50a, 50b, 50c are disposed respectively on the reflectors 20a, 20b, 20c, even when the distance between the reflectors is increased, the heat radiating elements 50a, 50b, 50c can move and follow the reflectors 20a, 20b, 20c. If each of the heat radiating elements 50a, 50b, 50c were integrated, a stress applied on the reflector unit RU would be a concern since the heat radiating elements are generally more rigid than the reflector unit. However, as in the vehicle headlight 1 of the present embodiment, since the plurality of heat radiating elements 50a, 50b, 50c are disposed respectively on the reflectors 20a, 20b, 20c, even in the case where the RU reflector unit expands thermally, a stress applied to the RU reflector unit can be removed.
    In the vehicle headlight 1 according to the present embodiment, the element attachment ribs
    heat radiation 33 inserted at through holes fixation of element of radiation of heat 53 of elements of radiation heat 50a, 50b, 50c are crimped of so thermal way so than the elements of radiation heat 50a, 50b, 50c are
    fixed. The heat radiation element fixing ribs 33 are smaller in diameter than the heat radiation element fixing holes 53, so that a space is formed between the inner peripheral surface of the fixing hole d heat radiating element 53 and the outer peripheral surface of the heat radiating element fixing rib 33. Therefore, in a state of thermal crimping, while movement of the heat radiating elements 50a, 50b , 50c in the direction of extension of the heat radiating element fixing ribs 33 is limited, there is room for movement in a direction perpendicular to the direction of extension. Therefore, even when the reflector unit RU and the heat radiating elements 50a, 50b, 50c expand with different coefficients of thermal expansion, since the heat radiating element fixing ribs 33 which fix the elements heat radiation 50a, 50b, 50c are movable in the heat radiation element fixing holes 53, a stress on the reflectors 20a, 20b, 20c can be removed.
    Therefore, the vehicle headlight 1 of the present embodiment has excellent thermal longevity.
    In the vehicle headlight 1 of this embodiment, the thermal conductivity of the heat radiating elements 50a, 50b, 50c is greater than the thermal conductivity of the reflector unit RU.
    As described above, the thermal crimping is achieved by deforming a portion of the heat radiating element fixing rib 33 which protrudes from the heat radiating element fixing hole 53 using heat. Therefore, since the thermal conductivity of the heat radiating elements 50a, 50b, 50c is greater than the thermal conductivity of the reflector unit RU, the heat during thermal crimping is transferred mainly to the heat radiating elements 50a, 50b, 50c and irradiated. Therefore, according to the vehicle headlight 1 of this embodiment, a deformation of the reflector unit RU at the time of fixing the heat radiating elements 50a, 50b, 50c to the reflector unit RU by crimping thermal can be removed.
    In the vehicle headlight 1 according to the present embodiment, the plurality of light source unit fixing ribs 34 extending on the side opposite to the reflector is provided on the base parts 30a, 30b, 30c , and the plurality of light source unit fixing holes 44 having a diameter larger than the light source unit fixing ribs 34 is provided for each of the light source units 40a, 40b, 40c. each of the light source unit fixing ribs 34 is inserted through the respective light source unit fixing hole 44 and thermally crimped so that a space is formed between the inner peripheral surface of the light hole light source unit attachment 44 and the outer peripheral surface of the light source unit attachment rib 34.
    When the temperatures of the reflector unit RU and of the light source units 40a, 40b, 40c increase as described above, the reflector unit RU and the light source units 40a, 40b, 40c tend to expand at mutually different rates of expansion. The light source unit fixing rib 34 is inserted into the light source unit fixing hole 44 which has a larger diameter than that of the light source unit fixing rib 34. Then , the light source unit fixing rib 34 is thermally crimped so that a space is formed between the inner peripheral surface of the light source unit fixing hole 44 and the outer peripheral surface of the light source unit fixing rib 34, so that the light source units 40a, 40b, 40c are fixed to the reflector unit RU. Therefore, in a thermal crimping state, while movement of the light source units 40a, 40b, 40c in the direction of extension of the light source unit fixing ribs 34 is limited, there is room for movement in a direction perpendicular to the direction of extension. Therefore, even when the RU reflector unit and the light source units 40a, 40b, 40c expand with different coefficients of thermal expansion as described above, since the unit fixing ribs of light source 34 are movable in the light source unit mounting hole 44, stress on the reflectors 20a, 20b, 20c can be removed.
    It is preferable that the size of the space between the inner peripheral surface of the light source unit fixing hole 44 and the outer peripheral surface of the light source unit fixing rib 34 is more smaller than the size of the space between the inner peripheral surface of the heat radiation element fixing hole 53 and the outer peripheral surface of the heat radiation element fixing rib 33. In this case, when the the reflector unit RU thermally expands, the heat radiating element fixing ribs 33 move in the heat radiating element fixing holes 53 so that a stress on the reflectors 20a, 20b, 20c can be suppressed, and relative movement between the light source units 40a, 40b, 40c and the reflectors 20a, 20b, 20c can be suppressed.
    Unlike the present embodiment, the diameter of the light source unit fixing hole 44 and the diameter of the light source unit fixing rib 34 may be equal to one the other without forming a space between the inner peripheral surface of the light source unit fixing hole 44 and the outer peripheral surface of the light source unit fixing rib 34. In this case, when the reflector unit RU expands and the position of the light source unit fixing hole 44 moves slightly, the light source unit fixing rib 34 follows the movement of the light source unit fixing hole light 44 more precisely. In this case, a change in light distribution due to relative positional displacements between the light source units 40a, 40b, 40c and the reflectors 20a, 20b, 20c can be further suppressed.
    (Second embodiment)
    A second embodiment of the present invention will then be described in detail with reference to FIG. 8. The same elements or constituent elements equivalent to those of the first embodiment are designated by the same references and explanations in duplicate will be omitted except when specifically described.
    Figure 8 is a view showing a lamp unit of a vehicle headlight according to the second embodiment of the present invention in the same manner as in Figure 3. The LU lamp unit of the present form is different from the lamp unit of the first embodiment in that it does not include the heat radiating element fixing ribs 33 of the first embodiment. However, as in the first embodiment, the light source unit fixing ribs 34 are inserted through the light source unit fixing holes 44 of the light source unit 40b and the holes inserting light source unit fixing rib 54 of heat radiating member 50b and then thermally crimped. Therefore, the heat radiating member 50b is fixed by the light source unit fixing ribs 34. In this embodiment, light source unit positioning projections 36 are also provided around light source unit fixing ribs 34.
    Since the heat radiating member 50b is fixed by the light source unit fixing ribs 34 in this manner, the light source unit fixing ribs 34 of the present embodiment can also be considered as heat radiating element fixing ribs, and in this case, the light source unit fixing rib inserting holes 54 of the heat radiating element 50b can also be regarded as fixing holes for heat radiating element. Next, in each of the light source units 40a, 40b, 40c, a plurality of light source unit fixing holes 44 having a diameter larger than the heat radiating element fixing ribs is formed in positions overlapping the heat radiating element mounting holes. Then, the heat radiating element fixing ribs are inserted through the light source unit fixing holes 44. Therefore, the light source units 40a, 40b, 40c are fixed by the light ribs fixing of heat radiating element; that is, by fixing the light source units 40a, 40b, 40c and the heat radiating elements 50a, 50b, 50c by thermal crimping of the heat radiating element fixing ribs, the number of ribs can be reduced and a simple configuration can be obtained.
    Although the present invention has been described with reference to the first and second embodiments by way of example, the present invention is not limited to these.
    For example, in the above embodiment, the number of lamps is not particularly limited as long as there are several.
    In addition, the base parts 30a, 30b, 30c may not be connected to each other, and may not have bearings.
    The number of heat radiating element fixing ribs 33 and the number of light source unit fixing ribs 34 are not particularly limited as long as there are several.
    In addition, in the above embodiments, a parabolic type lamp is described as an example, but the lamp is not limited to such a parabolic type lamp.
    According to the present invention, a vehicle headlight with excellent thermal longevity can be provided, and it can be used in the field of vehicle headlights for automobiles or equivalent.
    权利要求:
    Claims (5)
    [1" id="c-fr-0001]
    1. Vehicle headlight characterized in that it comprises:
    a reflector unit (RU) comprising a plurality of reflectors (20a, 20b, 20c) connected to each other, and base parts (30a, 30b, 30c) to which the reflectors (20a, 20b, 20c) are respectively connected;
    a plurality of light source units (40a,
    40b, 40c) arranged on the base parts (30a, 30b, 30c) for the respective reflectors (20a, 20b, 20c); and a plurality of heat radiating elements (50a, 50b, 50c) disposed on the respective light source units (40a, 40b, 40c), wherein the base portions (30a, 30b, 30c) are provided with '' a plurality of heat radiating element fixing ribs (33) extending on a side opposite to the reflectors (20a, 20b, 20c), in which the heat radiating elements (50a, 50b, 50c) are formed with a plurality of heat radiation element fixing holes (53) having a diameter larger than that of the heat radiation element fixing ribs (33), and in which each of the fixing ribs d the heat radiating element (33) is inserted through the respective hole of the heat radiating element fixing holes (53) and thermally crimped so that a space is formed between an inner peripheral surface of the radiator element mounting hole d heat (53) and an outer peripheral surface of the heat radiating element fixing rib (33).
    [2" id="c-fr-0002]
    The vehicle headlight according to claim 1, wherein a thermal conductivity of the heat radiating elements (50a, 50b, 50c) is greater than a thermal conductivity of the reflector unit (RU).
    [3" id="c-fr-0003]
    The vehicle headlight according to claim 1 or 2, wherein the base portions (30a, 30b, 30c) are provided with a plurality of side light source unit fixing ribs (34) extending opposite the reflectors (20a, 20b, 20c), and wherein the light source units (40a, 40b, 40c) are formed with a plurality of light source unit fixing holes (54) having a larger diameter larger than a diameter of the light source unit fixing ribs (34), and in which each of the light source unit fixing ribs (34) is inserted through the respective hole of the fixing holes d light source unit (54) and thermally crimped so that a space is formed between an inner peripheral surface of the light source unit fixing hole (54) and an outer peripheral surface of the rib fixing light source unit (34).
    [4" id="c-fr-0004]
    4. A vehicle headlight according to claim 1 or 2, wherein the light source units (40a,
    40b, 40c) are formed with a plurality of light source unit fixing holes (54) having a diameter larger than that of the heat radiating element fixing ribs (33) in positions overlapping the heat radiation element fixing holes (53), and into which the heat radiation element fixing ribs (33) are inserted through the
    [5" id="c-fr-0005]
    5 light source unit mounting holes (54).
    5. A vehicle headlight according to claim 3 or 4, wherein each of the light source units (40a, 40b, 40c) comprises a light emitting element (42) and a substrate (41) on which the element Light emitting means (42) is mounted, and the light source unit fixing holes (54) are formed in the substrate (41).
    1/6
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    同族专利:
    公开号 | 公开日
    DE102017219839A1|2018-05-09|
    US10054278B2|2018-08-21|
    CN108061277B|2021-03-30|
    CN108061277A|2018-05-22|
    FR3058501B1|2020-01-03|
    US20180128444A1|2018-05-10|
    JP6817031B2|2021-01-20|
    JP2018077981A|2018-05-17|
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    法律状态:
    2018-10-10| PLFP| Fee payment|Year of fee payment: 2 |
    2019-09-27| PLFP| Fee payment|Year of fee payment: 3 |
    2020-10-13| PLFP| Fee payment|Year of fee payment: 4 |
    2021-10-18| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2016218007A|JP6817031B2|2016-11-08|2016-11-08|Vehicle headlights|
    JP2016-218007|2016-11-08|
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