• 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:
    An optical unit (40) includes a light source (42), a rotatable reflector (44) rotating about its axis of rotation while reflecting light emitted from the light source (42). The light source includes first light emitting portions configured to emit a first light to scan a first region comprising a maximum light intensity region of the light distribution pattern, and second configured light emitting portions. to emit a second light to scan a second region adjacent to the first region. When a sum of the lengths of the first light-emitting portions in a longitudinal direction is expressed by L1 and a sum of the lengths of the second light-emitting portions in a direction parallel to the longitudinal direction of the first portions of light light emission is expressed by L2, a relation of L1> L2 is satisfied.
    公开号:FR3065275A1
    申请号:FR1853247
    申请日:2018-04-13
    公开日:2018-10-19
    发明作者:Hidetada Tanaka；Takayuki Yagi
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    Holder (s): KOITO MANUFACTURING CO., LTD ..
    Agent (s): CABINET BEAU DE LOMENIE.
    FR 3 065 275 - A1 (64) OPTICAL UNIT.
    (© An optical unit (40) comprises a light source (42), a rotary reflector (44) rotating about its axis of rotation while reflecting the light emitted by the light source (42). The light source comprises first light emitting portions configured to emit first light to scan a first region comprising a region of maximum light intensity of the light distribution pattern, and second light emitting portions configured to emit second light to scan a second region adjacent to the first region. When a sum of the lengths of the first light-emitting parts in a longitudinal direction is expressed by L1 and a sum of the lengths of the second light-emitting parts in a direction parallel to the longitudinal direction of the first light-emitting parts is expressed by L2, a relation of L1> L2 is satisfied.

    DOMAIN [0001]
    The present invention relates to an optical unit, and in particular an optical unit used for a vehicle headlight.
    BACKGROUND [0002]
    A device has recently been designed, in which a predetermined light distribution pattern is formed by reflecting the light emitted from a light source towards the front of a vehicle and scanning the region in front of the vehicle with the reflected light. For example, an optical unit is known which includes a rotary reflector and a plurality of light sources. The rotary reflector rotates in a direction around its axis of rotation while reflecting the light emitted by a light source. The plurality of light sources is composed of light emitting elements. The rotary reflector is provided with a reflecting surface so that the light from the light sources reflected by the rotary reflector forms a desired light distribution pattern. The plurality of light sources is arranged so that the lights emitted by the light sources are reflected in a position different from the reflecting surface (see patent document 1).
    [0003]
    Patent document 1: JP 2015-26628 (A) [0004]
    However, when scanning a large area with light reflected from the rotating reflector, there may be a decrease in maximum light intensity and deterioration of the imaging property. Consequently, in the optical unit described above, a light-emitting diode diffusion unit is provided so that the scattered light radiates over a wide area, remote from a light-emitting diode concentration unit to achieve a high concentration on the front side in a direction of travel. In addition, light emitted from the light emitting diode focus unit is reflected in a first position of the rotary reflector and then is projected forward by a first projection lens. In addition, the light emitted by the light emitting diode scattering unit is reflected in a second position of the rotary reflector, and then is projected forward by a second projection lens. Therefore, a plurality of projection lenses are required and the whole unit tends to be large.
    SUMMARY
    The present invention has been made taking into account these situations, and its object is to provide a new optical unit for illuminating a large area with a simple configuration.
    [0006]
    In order to solve the above problem, an optical unit according to an aspect of the present invention comprises a first light source, a second light source, a rotary reflector rotating about its axis of rotation while reflecting a first light emitted at from the first light source, and a projection lens for projecting the first light reflected from the rotary reflector in a direction of light radiation from the optical unit. The second light source is arranged so that the second emitted light is incident on the projection lens without being reflected by the rotary reflector, and the projection lens projects the second light in the direction of radiation of the optical unit.
    [οοοη
    According to this aspect, since the second light emitted from the second light source is incident on the projection lens without being reflected by the rotary reflector, it is possible to select optical characteristics of the second light without taking into consideration reflection by the rotary reflector. Therefore, it is possible to radiate a large area, for example, using the second light source having a wider viewing angle than the first light source.
    [0008]
    The second light source can be arranged between a substrate on which the first light source is mounted and the rotary reflector, seen from the front from the front of the vehicle. In this way, the second light source can be placed without widening the width of the optical unit.
    [0009]
    The projection lens can be configured to project the first incident light onto the latter after being reflected by the rotary reflector as a pattern of concentrated light distribution in the direction of light radiation from the optical unit and to project the second light incident on the latter without having been reflected by the rotary reflector as a pattern of distribution of light scattered in the direction of radiation of the optical unit. In this way, it is possible to radiate a large area without greatly reducing the light intensity of the light distribution pattern.
    [0010]
    Another aspect of the present invention is also an optical unit. The optical unit includes a first light source, a rotary reflector rotating about its axis of rotation while reflecting a first light emitted from the first light source, a projection lens for projecting the first light reflected by the reflector rotatable in a direction of light radiation from the optical unit, a second light source disposed between the first light source and the projection lens, and an optical element for modifying an optical path of the second light emitted by the second source of light and direct the second light towards the projection lens. The second light source is arranged so that the second light emitted is incident on the projection lens without having been reflected by the rotary reflector.
    [0011]
    According to this aspect, since the second light emitted by the second light source is incident on the projection lens without having been reflected by the rotary reflector, it is possible to select optical characteristics of the second light without taking into account the reflection by the rotary reflector. Therefore, it is possible to radiate a larger area, for example by using the second light source having a wider viewing angle than the first light source. In addition, since the optical element changes the optical path of the second light and directs the second light to the projection lens, it is possible to adjust the location where the second light source is arranged, and therefore the degree of freedom in the arrangement of the parts constituting the optical imity is increased.
    [0012]
    The projection lens can be configured to project the first incident light onto the latter after being reflected by the rotary reflector as a pattern of concentrated light distribution in the direction of light radiation from the optical unit and to project the second light incident on the latter without having been reflected by the rotary reflector as a pattern for distributing light scattered in the direction of light radiation from the optical unit. In this way, it is possible to radiate a large area without greatly reducing the light intensity of the light distribution pattern. [0013]
    The second light source may include a plurality of light emitting elements arranged in an array form. In this way, it is possible to modify the radiation range in steps.
    [0014]
    Yet another aspect of the present invention is also an optical unit. The optical unit includes a first light source, a rotary reflector rotating about its axis of rotation while reflecting a first light emitted from the first light source, a projection lens for projecting the first light reflected by the reflector rotatable in a direction of light radiation from the optical unit, a second light source disposed between the first light source and the projection lens, and an optical element for reflecting the second light emitted by the second light source and directing the second light towards the projection lens. The second light source is arranged so that the second light emitted is incident on the projection lens without having been reflected by the rotary reflector.
    [0015]
    According to this aspect, since the second light emitted by the second light source is incident on the projection lens without having been reflected by the rotary reflector, it is possible to select optical characteristics of the second light without taking into account the reflection by the rotary reflector. Therefore, it is possible to radiate a larger area, for example, using the second light source which has a wider viewing angle than the first light source.
    [0016]
    Yet another aspect of the present invention is also an optical unit. The optical unit includes a light source and a rotary reflector rotating about its axis of rotation while reflecting the light emitted by the light source. The rotary reflector is provided with a reflective surface so that a predetermined light distribution pattern is formed by scanning the front side with the light reflected by the rotating rotary reflector. The light source includes first light emitting portions configured to emit a first light to scan a first region including a region of maximum light intensity of the light distribution pattern and second light emitting portions to emit a second light to scan a second region adjacent to the first region. When the sum of the lengths of the first light-emitting parts in a longitudinal direction is expressed by L1 and the sum of the lengths of the second light-emitting parts in a direction parallel to the longitudinal direction of the first light-emitting parts light is expressed by L2, a relation of L1> L2 is satisfied.
    [0017]
    According to this aspect, since the second light emitting parts for scanning the second region adjacent to the first region are provided in addition to the first light emitting parts for scanning the first region comprising the region of maximum light intensity , a wider area of radiation becomes possible while satisfying the maximum light intensity.
    [0018]
    When the number of light emitting elements constituting the first light emitting parts is expressed by NI and the number of light emitting elements constituting the second light emitting parts is expressed by N2, a relation of NI> N2 is satisfied. In this way, it is possible to suppress the number of light emitting elements in the second light emitting parts which emit the second light to scan the second region not including the region of maximum light intensity.
    [0019]
    The area of the second light-emitting parts may be smaller than that of the first light-emitting parts. In this way, for example, the number of light emitting elements constituting the second light emitting parts can be reduced, compared to the first light emitting parts.
    [0020]
    The second light emitting portions may have a plurality of light emitting regions spaced from each other with a non-light emitting region interposed therebetween. In this way, it is possible to radiate a large area without increasing the size of the second light-emitting parts.
    [0021]
    The plurality of light emitting regions may be provided adjacent to each of the two end portions in the longitudinal direction of the first light emitting portions. In this way, a region having the same width as the first light-emitting parts can be radiated by the second light-emitting parts.
    [0022]
    According to the present invention, it is possible to make a new optical unit capable of illuminating a large area with a simple configuration.
    BRIEF DESCRIPTION OF THE DRAWINGS
    Figure 1 is a horizontal sectional view of a vehicle headlight.
    FIG. 2 is a top view schematically showing a configuration of an optical unit according to an example of reference.
    Figure 3 is a side view of the optical unit according to the reference example.
    Figure 4 is a schematic view of an optical unit according to a first embodiment, seen from above.
    Figure 5 is a schematic view of the optical unit shown in Figure 4, viewed from the side.
    Figure 6 is a schematic view of the optical unit shown in Figure 4, front view.
    Figure 7A is an enlarged schematic view of a main part of a first light source according to the present embodiment, and Figure 7B is an enlarged schematic view of a main part of a light emitting module according to the present embodiment.
    FIG. 8 is a view schematically showing a light distribution pattern formed by a vehicle headlight comprising the optical unit according to the first embodiment.
    Figure 9 is a schematic view of an optical unit according to a second embodiment, seen from above.
    Figure 10 is a schematic view of the optical unit shown in Figure 9, viewed from the side.
    Figure 11 is a schematic view of the optical unit shown in Figure 9, front view.
    Figure 12 is a schematic view of an optical unit according to a third embodiment, seen from above.
    Figure 13 is a schematic view of the optical unit shown in Figure 12, viewed from the side.
    Figure 14 is a schematic view of the optical unit shown in Figure 12, front view.
    Figure 15 is a horizontal sectional view of a vehicle headlight according to a fourth embodiment.
    Figure 16 is a front view of the vehicle headlight according to the fourth embodiment.
    Figure 17 is a top view of a first light emission source according to the present embodiment.
    Figure 18 is a view schematically showing a positional relationship among a plurality of light emitting modules mounted on the first light source.
    Fig. 19 is a view showing a pattern P projected forward by reflecting a light source image with a fixed rotating reflector in a state in which the first light source is fully illuminated.
    FIG. 20 is a view schematically showing a light distribution pattern formed by a vehicle headlight comprising the optical unit according to the fourth embodiment.
    FIGS. 21A to 21C are views showing modifications of a pattern of high beam light distribution by the first light source according to the present embodiment.
    EMBODIMENTS
    Hereinafter, depending on the embodiments, the present invention is described with reference to the drawings. The same elements, members or methods of constitution or the like, on each drawing are designated by the same reference numbers, and repeated explanations are omitted if appropriate. In addition, the embodiments are not intended to limit the invention, but are examples. All the characteristics described in the embodiments and their combinations are not necessarily essential to the invention. [0025]
    An optical unit of the present invention can be used for different vehicle headlights. First, we describe an arrangement of a vehicle headlight. An optical unit according to each embodiment (to be described later) can be mounted on the vehicle headlight.
    [Vehicle headlight]
    Figure 1 is a horizontal sectional view of a vehicle headlight. FIG. 2 is a top view schematically showing a configuration of an optical unit according to an example of reference. Figure 3 is a side view of the optical unit according to the reference example.
    [002η
    A vehicle headlight 10 shown in Figure 1 is a right headlight mounted on the right side of a front end portion of an automobile, and has the same structure as a left headlight mounted on the left side, except that is bilaterally symmetrical to the left headlight. Therefore, hereinafter the right headlight 10 will be described in detail, and the description of the left vehicle headlight is omitted.
    [0028]
    As shown in Figure 1, the vehicle headlight 10 includes a lamp body 12 having a recess opening forward. The front opening of the lamp body 12 is covered by a transparent front cover 14, thereby forming a lamp chamber 16. The lamp chamber 16 functions as a space in which two lamp units 18, 20 are housed in a state in which they are arranged side by side across the width of the vehicle.
    [0029]
    Among the lamp units, the lamp unit arranged on the outer side, i.e. the lamp unit 20 arranged on the upper side in Fig. 1 in the right vehicle headlight 10, is a unit lamp comprising a lens. The lamp unit 20 is configured to radiate a variable high beam. On the other hand, among the lamp units, the lamp unit disposed on the inner side, i.e. the lamp unit 18 disposed on the lower side in Figure 1, in the vehicle headlight right 10 is configured to radiate a low beam. [0030]
    The dipped beam lamp unit 18 includes a reflector 22, a light source bulb (incandescent bulb) 24 supported on the reflector 22 and a screen (not shown). The reflector 22 is supported in an inclined manner relative to the lamp body 12 by known means (not shown), for example, means using a sighting screw and a nut.
    [0031]
    The lamp unit 20 is an optical unit which includes a reflector 26, a light emitting diode 28 and a convex lens 30 as a projection lens disposed in front of the rotating reflector 26. Meanwhile, instead of the light emitting diode 28 , a semiconductor light emitting element such as a light emitting element (EL) or an LD element (laser diode) can be used as a light source. In particular, for the control consisting in masking a part of a light distribution pattern (to be described later), it is desirable to use a light source capable of precisely switching on / off in a short period of time. Although the shape of the convex lens 30 can be appropriately selected, depending on the light distribution characteristics, such as a light distribution pattern or a required lighting pattern, an aspherical lens or a lens is used. with freely curved surface.
    [0032]
    The rotary reflector 26 rotates in a direction around its axis of rotation R by a drive source such as a motor (not shown). Additionally, the rotary reflector 26 has a reflecting surface configured to reflect the light emitted from the light emitting diode 28 while rotating and to form a desired light distribution pattern.
    [0033]
    The rotary reflector 26 is configured so that two blades 26a serving as a reflecting surface and having the same shape are provided around a cylindrical rotary part 26b. The axis of rotation R of the rotary reflector 26 is oblique to an optical axis Ax and is provided in a plane comprising the optical axis Ax and the light-emitting diode 28. In other words, the axis of rotation R is provided substantially parallel to a light scanning plane (radiation beam) of the light emitting diode 28 which scans in a left and right direction by rotation. In this way, the thickness of the optical unit can be reduced. Here, the scanning plane can be considered as a fan-shaped plane which is formed by continuously connecting the geometrical location of the light from the light emitting diode 28 as scanning light, for example. Furthermore, in the lamp unit 20 according to the present embodiment, the light-emitting diode 28 provided is relatively small, and the position where the light-emitting diode 28 is arranged, is located between the rotary reflector 26 and the convex lens 30 and is deviated from the optical axis Ax. Therefore, the dimension in a depth direction (a front-rear direction of the vehicle) of the vehicle headlight 10 can be shortened, compared to the case in which a light source, a reflector and a lens are aligned on an optical axis. as in a conventional projector type lamp unit.
    [0034]
    In addition, the shapes of the blades 26a of the rotary reflector 26 are configured such that a secondary light source of the light emitting diode 28 due to reflection, is formed near a focal point of the convex lens 30. In addition , each of the blades 26a has a twisted shape so that an angle formed by the optical axis Ax and the reflecting surface changes along a circumferential direction with the axis of rotation R as the center. In this way, as shown in Figure 3, scanning using the light from light emitting diode 28 becomes possible.
    (First embodiment)
    In a scanning optical system using the rotary reflector 26, when a scattering (scanning) range expands, there is a possibility that the maximum light intensity will be reduced and the imaging property will be deteriorated. Therefore, a practical scanning range is approximately ± 10 ° from the optical axis (central axis). Since the lamp unit 20 described above forms a pattern of high beam light distribution by a single light source, there is a limit to widening the scanning area. Consequently, in the optical unit according to each of the following embodiments, a plurality of light sources are provided in order to widen the radiation area of the high beam light distribution pattern.
    [0036]
    Figure 4 is a schematic view of an optical unit 40 according to a first embodiment, seen from above. Figure 5 is a schematic view of the optical unit 40 shown in Figure 4, viewed from the side. Figure 6 is a schematic view of the optical unit 40 shown in Figure 4, front view.
    [003η
    The optical unit 40 according to the present embodiment comprises a first light source 42, a rotary reflector 44 rotating about its axis of rotation R while reflecting a first light L1 emitted by the first light source 42, a lens of projection 46 to project the first light L1 reflected by the rotary reflector 44 in a direction of light radiation (on the right in FIG. 4) from the optical unit, a second light source 48 arranged between the first light source 42 and the projection lens 46, an internal lens 50 which is an optical element configured to modify an optical path of a second light L2 emitted by the second light source 48 and to direct the second light L2 towards the projection lens 46, and a heat sink 52 on which the first light source 42 and the second light source 48 are mounted. [0038]
    In the first light source 42, a plurality of light emitting modules are arranged in an array form. Specifically, eight light emitting modules 54 are arranged on three floors. That is to say that four light emission modules 54 are arranged in an upper stage, two light emission modules 54 are arranged in a central stage and two light emission modules 54 are arranged in a inferior stage. The two light emitting modules 54 in the central floor are arranged adjacent to the lower side of the light emitting modules 54 at the two ends of the four light emitting modules 54 in the upper floor. The two light emitting modules 54 in the lower floor are arranged adjacent to the lower side of the two light emitting modules 54 in the central floor.
    [0039]
    Figure 7A is an enlarged schematic view of a main part of a first light source according to the present embodiment, and Figure 7B is an enlarged schematic view of a main part of a light emitting module according to the present embodiment.
    [0040]
    As shown in FIG. 7A, small reflectors 56 in which apertures 56a corresponding to the light emitting surfaces 54a are formed in a lattice shape, are arranged on the side of the light emitting surfaces 54a of the modules. light emission 54. In this way, the light emitted by the light emission modules 54 reaches the reflecting surface of the rotary reflector 44 without being much scattered. [0041]
    As shown in FIG. 7B, each light emitting module 54 has a rectangular light emitting diode 57 mounted on a printed circuit board 55, a light wavelength conversion element 58 mounted on a light emitting surface. light emitting diode 57, and a frame body 59 provided to surround an outer periphery of the light emitting diode 57 and the light wavelength conversion element 58. The light emitting diode 57 is, for example, a semiconductor light emitting element which emits blue light. The light wavelength conversion element 58 is, for example, formed by dispersing YAG ceramics or YAG powder to emit yellow light into a resin. The frame body 59 is a white resin in which white powder is dispersed. The frame body 59 reflects the light emitted from the side surface of the light-emitting diode 57 and the light wavelength conversion element 58.
    [0042]
    In the second light source 48, two light emitting modules 53 are arranged side by side in a horizontal direction in an array form, and each of the light emitting modules 53 can be individually turned on / off. A specific configuration of each light emitting module 53 is the same as that of the light emitting module 54.
    [0043]
    The second light source 48 according to the present embodiment is arranged so that the second light L2 is incident on the projection lens 46 without being reflected by the rotary reflector 44. In this way, it is possible to select optical characteristics of the second light L2 emitted by the second light source 48 without taking into consideration the reflection by the rotary reflector 44. Therefore, it is possible to illuminate a larger area, for example, by using the second light source 48 having a wider viewing angle than the first light source 42. Here, the viewing angle is an index expressed by a light-emitting angle, the two ends of which are placed in positions in which the intensity d the emission represents half of a peak value.
    [0044]
    In addition, since the internal lens 50 modifies the optical path of the second light L2 and directs the second light L2 towards the rotary reflector 44, it is possible to adjust the place where the second light source 48 is arranged. For example, in the optical unit 40 according to the present embodiment, when the internal lens 50 is not provided, the position of the second light source 48 suitable for the projection lens 46 is positioned behind the heat sink 52 , which complicates the layout. However, by arranging an element for modifying the optical path of the light, such as the internal lens 50, in a position between the second light source 48 and the projection lens 46, the second light L2 emitted by the second light source 48 can be considered as if it reaches the projection lens 46 from behind the heat sink 52. Consequently, the flexibility in the arrangement of the parts constituting the optical unit 40 comprising the second light source 48 is increased.
    [0045]
    FIG. 8 is a view schematically showing a light distribution pattern formed by a vehicle headlight comprising the optical unit according to the first embodiment. A high beam light distribution pattern PH shown in Fig. 8 is obtained by combining a concentrated light distribution pattern PHI and a scattered light distribution pattern PH2. The concentrated light distribution pattern PHI is formed so that the first light L1, which is reflected by the rotary reflector 44 and is then incident on the projection lens 46, is projected in the form of a light source image X of the first light source 42 and is scanned in the horizontal direction. On the other hand, the scattered light distribution pattern PH2 is formed so that the second light L2, which is incident on the projection lens 46 without having been reflected by the rotary reflector 44, is projected in the radiation direction of light from the optical unit 40. The scattered light distribution pattern PH2 illuminates the right side region of a right end portion of the concentrated light distribution pattern PHI. In this way, a larger area can be illuminated with a simple configuration without greatly reducing the maximum light intensity of the PH high beam light distribution pattern. [0046]
    Furthermore, the second light source 48 comprises a plurality of light emitting modules 53 arranged in the form of an array and is configured so that the light of the light emitting modules 53 can be individually adjusted. In this way, the radiation area can be enlarged in stages.
    [004η (Second embodiment)
    FIG. 9 is a schematic view of an optical unit 60 according to a second embodiment, seen from above. Figure 10 is a schematic view of the optical unit 60 shown in Figure 9, viewed from the side. Figure 11 is a schematic view of the optical unit 60 shown in Figure 9, front view. During this time, the same components as those of the optical unit according to the first embodiment are designated by the same reference numbers, and their explanation is omitted.
    [0048]
    The optical unit 60 according to the second embodiment comprises the first light source 42, the second light source 48, the rotary reflector 44 rotating about its axis of rotation R while reflecting the first light L1 emitted by the first source of light 42, the projection lens 46 for projecting the first light L1 reflected by the rotary reflector 44 in the direction of light radiation from the optical unit 60, and a heat sink 62 on which the first light source 42 and the second light source 48 are mounted. The second light source 48 is arranged so that the second emitted light L2 is directly incident on the projection lens 46 without having been reflected by the rotary reflector 44. The projection lens 46 projects the second light L2 in the direction of radiation of light from the optical unit 60.
    [0049]
    In this way, it is possible to select optical characteristics of the second light L2 emitted by the second light source 48 without taking into consideration the reflection by the rotary reflector 44. Consequently, it is possible to illuminate a larger area with a simple configuration using the second light source 48 having a wider viewing angle than the first light source 42.
    [0050]
    The second light source 48 is disposed between the printed circuit board 55 on which the first light source 42 is mounted and the rotary reflector 44, in a front view (represented in FIG. 11), observed from the front of the vehicle. In this way, the second light source 48 can be placed without enlarging the width of the optical unit 60. In addition, the optical unit 60 according to the present embodiment can form a high beam light distribution pattern PH shown in Figure 8, similar to the optical unit 40 according to the first embodiment.
    (Third embodiment)
    Figure 12 is a schematic view of an optical unit 80 according to a third embodiment, seen from above. Figure 13 is a schematic view of the optical unit 80 shown in Figure 12, viewed from the side. Figure 14 is a schematic view of the optical unit 80 shown in Figure 12, front view. During this time, the same components as those of the optical units according to the first and second embodiments are designated by the same reference numbers, and their explanation is omitted.
    [0052]
    The optical unit 80 according to the third embodiment comprises the first light source 42, the rotary reflector 44 rotating around the axis of rotation R while reflecting the first light Ll emitted by the first light source 42, the lens projection 46 to project the first light L1 reflected by the rotary reflector 44 in the direction of light radiation from the optical unit 80, the second light source 48 disposed between the first light source 42 and the projection lens 46, and a fixed reflector 66 as an optical element for reflecting the second light L2 emitted by the second light source 48 and directing the second light L2 towards the projection lens 46. The second light source 48 is arranged so that the second light L2 emitted is incident on the projection lens 46 without having been reflected by the rotary reflector 44.
    [0053]
    In this way, it is possible to select optical characteristics of the second light L2 emitted by the second light source 48 without taking into consideration the reflection by the rotary reflector 44. Consequently, it is possible to radiate a wider range with a simple configuration using the second light source 48 having a wider viewing angle than the first light source 42.
    (Fourth embodiment)
    Figure 15 is a horizontal sectional view of a vehicle headlight according to a fourth embodiment. Figure 16 is a front view of the vehicle headlight according to the fourth embodiment. Meanwhile, some parts are not shown in Figure 16.
    [0055]
    A vehicle headlight 100 according to the fourth embodiment is a left headlight mounted on the left side of a front end portion of an automobile and has the same structure as a right headlight mounted on the right side, except that is bilaterally symmetrical with the right headlight. Therefore, the left vehicle headlight 100 is described in detail, and the description of the right vehicle headlight is omitted. In addition, the description of the configuration covering the optical units according to the first, second and third embodiments is also omitted, if appropriate.
    [0056]
    As shown in Figure 15, the vehicle headlight 100 includes a lamp body 112 having a recess opening forward. The front opening of the lamp body 112 is covered with a transparent front cover 114, thereby forming a lamp chamber 116. The lamp chamber 116 functions as a space in which a single lamp unit 118 is housed. The optical unit 118 is an optical unit configured to project both a variable high beam and a low beam. Here, the variable high beam is for a beam which is controlled to change the shape of a high beam light distribution pattern. For example, a radiation-free region (light masking portion) may be partially generated in the light distribution pattern.
    [005η
    The optical unit 118 according to the present embodiment comprises a first light source 142, a focusing lens 143 as the main optical system (optical element) for modifying an optical path of the first light L1 emitted by the first light source light 142 and direct the first light L1 to a blade 126a of a rotary reflector 126, the rotary reflector 126 rotating about the axis of rotation R while reflecting the first light L1, a convex lens 130 as a projection lens to project the first light L1 reflected by the rotary reflector 126 in a direction of light radiation (on the left in FIG. 15) from the optical unit, a second light source 148 arranged between the first light source 142 and the lens convex 130, a diffusion lens 150 as the main optical system (optical element) for modifying an optical path of the second light 12 emitted by the of uth light source 148 and direct the second light 12 to the convex lens 130, and a heat sink 152 on which the first light source 142 and the second light source 148 are mounted. [0058]
    The rotary reflector 126 has the same structure as the rotary reflector 26 and the rotary reflector 44 described above. The rotary reflector 126 is provided with the blade 126a as a reflective surface so that a predetermined light distribution pattern is formed by scanning the front side with the light reflected by the rotary reflector 126 which rotates. For each light source, a semiconductor light emitting element such as a light emitting diode, an EL element and an LD element is used. Although the shape of the convex lens 130 can be appropriately selected, depending on the light distribution characteristics, such as a light distribution pattern or a required lighting pattern, an aspherical lens or a surface lens freely curved can be used. [0059]
    For example, the convex lens 130 according to the present embodiment can be provided with a cut part 130a in which part of the external periphery of the convex lens 130 is cut in a vertical direction by developing the arrangement of the respective light sources and the rotary reflector 126. Therefore, the size of the optical unit 118 across the width of the vehicle can be reduced. In addition, the presence of the cut-out portion 130a complicates the interference of the blade 126a of the rotary reflector 126 with the convex lens 130, so that the convex lens 130 and the rotary reflector 126 can approach each other. . In addition, since a non-circular part (right) is formed on the outer periphery of the convex lens 130 when the vehicle headlight 100 is viewed from the front, it is possible to make a vehicle headlight with a new design which includes a lens of an external shape in which a curve and a straight line are combined, as observed from the front of the vehicle.
    [0060]
    Figure 17 is a top view of the first light source 142 according to the present embodiment. FIG. 18 is a view schematically showing a positional relationship among a plurality of light emission modules mounted on the first light source 142.
    [0061]
    In the first light source 142 according to the present embodiment, a plurality of light emitting modules 154 is arranged in the form of an array. Specifically, as shown in Figure 17, nine light emitting modules 154 (154a - 154i) are arranged on three stages on a printed circuit board 144. That is, five light emitting modules 154c to 154g are arranged in an upper stage, two light emission modules 154b, 154h are arranged in a central stage, and two light emission modules 154a, 154i are arranged in a lower stage. The two light emission modules 154b, 154h in the central floor are arranged adjacent to the lower side of the light emission modules 154c, 154g at the two ends of the five light emission modules 154c to 154h in the 'upper floor. The two light emitting modules 154a, 154i in the lower floor are arranged adjacent to the lower side of the two light emitting modules 154b, 154h in the central floor. Each of the light emission modules 154a to 154i can be individually turned on / off. Meanwhile, a specific configuration of each light emitting module 154 is the same as that of the light emitting module 54 described above.
    [0062]
    As shown in FIGS. 15 and 16, the concentration lens 143 composed of a plurality of internal lenses corresponding to the respective light-emitting surfaces, is arranged on the side of the light-emitting surfaces of the light-emitting modules. light 154 included in the first light source 142. In this way, the light emitted by the light emitting modules 154 reaches the reflecting surface of the rotary reflector 126 without being deflected much.
    [0063]
    In the second light source 148, two light emitting modules 153 are arranged side by side in the horizontal direction in an array form, and each of the light emitting modules 153 can be individually turned on / off. A specific configuration of each light emission module 153 is the same as that of the light emission module 54.
    [0064]
    The second light source 148 according to the present embodiment is arranged so that the second light L2 is incident on the convex lens 130 without having been reflected by the rotary reflector 126. In this way, it is possible to select optical characteristics of the second light L2 emitted by the second light source 148 without taking into consideration the reflection by the rotary reflector 126. Consequently, for example, the light emitted by the second light source 148 is scattered by the diffusion lens 150 and is then incident on the convex lens 130, so that a larger area can be radiated. Therefore, the second light source 148 can be used as a light source for a low beam light distribution pattern. [0065]
    Fig. 19 is a view showing a pattern P projected forward by reflecting a light source image with the fixed rotary reflector 126 in a state in which the first light source 142 is fully illuminated. FIG. 20 is a view schematically showing a light distribution pattern formed by the vehicle headlight 100 comprising the optical unit according to the fourth embodiment.
    [0066]
    The light distribution pattern shown in Fig. 20 is obtained by combining a high beam light distribution pattern PH and a low beam light distribution pattern PL. In addition, the high beam light distribution pattern PH is a pattern resulting from the scanning of the pattern P shown in FIG. 19.
    [0067]
    As shown in FIG. 19, a concave pattern P is formed by light source images 155a to 155i corresponding to the respective light emitting surfaces of the light emitting modules 154a to 154i. Further, scanning patterns Pa to Pi are formed by scanning the respective light source images 155a to 155i and the high beam light distribution pattern PH is formed by superimposing the respective scanning patterns Pa to Pi. Meanwhile, a space between the light emitting module 154a and the light emitting module 154i is determined so that the scanning pattern Pa and the scanning pattern Pi overlap at least partially. Similarly, a space between the light emitting module 154b and the light emitting module 154h is determined so that the scanning pattern Pb and the scanning pattern Ph overlap at least partially.
    [0068]
    In addition, the light which is emitted by the light emitting modules 153 of the second light source 148 and scattered by the scattering lens 150, passes through the convex lens 130 to radiate the region on the lower side of the line HH and the right side of the line VV, as a pattern for the distribution of the low beam light PL. During this time, it goes without saying that the entire region on the lower side of the line HH is radiated by the pair of left and right vehicle headlights 100. In this way, since the optical unit 118 according to the present mode of embodiment can project the light emitted by the first light source 142 and the second light source 148 forwards using a common convex lens 130, it is possible to radiate an extended area with a simple configuration. [0069]
    The first light source 142 according to the present embodiment comprises the light emitting modules 154c to 154g as a first light emitting part configured to emit light to scan the first region RI comprising the region of maximum light intensity Rmax of the high beam light distribution pattern PH, the light emitting modules 154b, 154h as the second light emitting part configured to emit the light to scan the second region R2 adjacent to the first region R1, and the light emitting modules 154a, 154i as a third light emitting portion configured to emit light to scan a third region R3 adjacent to the second region R2. The maximum light intensity region Rmax of the high beam light distribution pattern PH according to the present embodiment is a region near a point of intersection between the line H-H and the line V-V.
    [0070]
    Furthermore, as shown in FIG. 18, in the first light source 142 according to the present embodiment, when the sum of the lengths of all the light emitting modules 154c to 154g in the longitudinal direction is expressed by L1 and the sum of the lengths of the light emission modules 154b, 154h in the direction parallel to the longitudinal direction of all the light emission modules 154c to 154g is expressed by L2 (L2 '+ L2 ”), a relation of L1 > L2 is satisfied.
    [0071]
    In this way, since the optical imitation 118 includes the light emission modules 154b, 154h to scan the second region R2 adjacent to the first region RI in addition to the light emission modules 154c to 154g to scan the first region RI comprising the region of maximum light intensity, a wider area of radiation becomes possible while satisfying the maximum light intensity.
    [0072]
    Furthermore, in the first light source 142 according to the present embodiment, when the number of light emission modules 154 for scanning the first region RI comprising the region of maximum light intensity is expressed by NI (Nl = 5 ) and that the number of light emission modules 154 for scanning the second region R2 is expressed by N2 (N2 = 2), a relation of NI> N2 is satisfied. In this way, it is possible to suppress the number of light emitting modules 154 which emit light to scan the second region R2 not comprising the region of maximum light intensity Rmax.
    [0073]
    In addition, as shown in FIGS. 17 and 18, the surface of the second light emitting part (light emitting modules 154b, 154h) is smaller than that of the first light emitting part (light modules light emission 154c to 154g). In this way, for example, the number of light emitting modules 154 constituting the second light emitting part can be reduced, compared to the first light emitting part.
    [0074]
    Furthermore, as shown in Fig. 18, the light emitting modules 154b, 154h are a plurality of light emitting regions spaced from each other with a non-light emitting region R4 interposed therebetween. In this way, as shown in FIG. 20, it is possible to radiate the second region R2 over the same extended area as the first region RI only with two scanning patterns Pb, Ph without increasing the size of the light emitting modules. 154b, 154h.
    [0075]
    The light emitting modules 154b, 154h are provided adjacent to each of the light emitting modules 154c, 154g positioned at the two ends of the light emitting modules 154c to 154g in the longitudinal direction. In this way, the light emitting modules 154b, 154h can radiate a region having the same width as the region radiated by the light emitting modules 154c to 154g.
    [0076]
    Figs. 21A to 21C are views showing changes in the pattern of high beam light distribution by the first light source 142 according to the present embodiment.
    [0077]
    A PHI high beam light distribution pattern shown in Fig. 21A is a pattern in which part of the third region R3 is a light masking region (region without radiation). For this purpose, the light emission modules 154a, 154i can be stopped at a predetermined time.
    [0078]
    A high beam light distribution pattern PH2 ’shown in Fig. 21B is a pattern in which part of the first region R1 and the second region R2 is a region of light masking (region without radiation). For this purpose, the light emission modules 154b to 154h can be stopped at a predetermined time.
    [0079]
    A high beam light distribution pattern PH3 ’shown in Fig. 21C is a pattern in which part of the first region RI is a light masking region (ray without radiation). For this purpose, the light emission modules 154c to 154g can be stopped at a predetermined time.
    [0080]
    As described above, in the optical unit 118 according to the present embodiment, a plurality of light emitting modules are arranged along the first direction so that the light source images are arranged in the direction scanning direction (horizontal direction) in order to increase the maximum light intensity of the central part of the first region RI, and the light emitting modules are also arranged along the second direction intersecting the first direction in order to widen the radiation range in the direction intersecting the scanning direction.
    [0081]
    Above, the present invention has been described with reference to each of the embodiments described above. However, the present invention is not limited to each of the embodiments described above, but it is also intended that an appropriate combination or substitution for the configurations of the embodiment is included in the present invention. Furthermore, depending on the knowledge of the person skilled in the art, the combination or the order of processing in each embodiment may be modified as appropriate, or a modification, such as different design changes, may be added to each embodiment. An embodiment to which such a modification is added may also be included within the scope of the present invention.
    权利要求:
    Claims (5)
    [1" id="c-fr-0001]
    1. An optical unit (40,60,80,118) comprising: a light source, and a rotary reflector (44,126) rotating about its axis of rotation (R) while reflecting the light emitted by the light source, in which the rotary reflector (44,126) is provided with a reflecting surface (126a) so that a predetermined light distribution pattern is formed by scanning a front side with light reflected by the rotating rotary reflector (44,126) in which the source of light includes:
    first light emitting portions (154c-154g) configured to emit a first light to scan a first region (RI) comprising a region of maximum light intensity (Rmax) of the light distribution pattern, and second portions emitting light (154a, 154b, 154h, 154i) configured to emit a second light to scan a second region (R2, R3) adjacent to the first region (RI), and wherein when a sum of the lengths of the first light-emitting parts (154c-154g) in a longitudinal direction is expressed by L1 and that a sum of the lengths of the second light-emitting parts (154a, 154b, 154h, 154i) in a direction parallel to the longitudinal direction of the first light-emitting parts is expressed by L2, a relation of L1> L2 is satisfied.
    [2" id="c-fr-0002]
    2. The optical unit according to claim 1, wherein when a number of light emitting elements constituting the first light emitting parts (154c, 154g) is expressed by NI and a number of elements d the light emission constituting the second light emission parts (154a, 154b, 154h, 154i) is expressed by N2, a relation of NI> N2 is satisfied.
    [3" id="c-fr-0003]
    3. Optical unit according to claim 1 or 2, in which an area of the second light-emitting parts (154a, 154b, 154h, 154i) is smaller than an area of the first light-emitting parts (154c- 154g).
    [4" id="c-fr-0004]
    The optical unit according to any of claims 1 to 3, wherein the second light emitting parts (154a, 154b, 154h, 154i) comprise a plurality of light emitting regions spaced from each other with a region without light emission (R4) interposed between them.
    [5" id="c-fr-0005]
    5. The optical unit according to claim 4, wherein the plurality of light emitting regions (154b, 154h) is provided adjacent to each of the two end parts (154c, 154g) of the first light emitting parts. light in the longitudinal direction.
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    同族专利:
    公开号 | 公开日
    CN108375029B|2021-03-09|
    JP6951076B2|2021-10-20|
    FR3065275B1|2020-06-12|
    CN108375029A|2018-08-07|
    JP2018067523A|2018-04-26|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    CN104976564B|2010-04-13|2017-11-14|株式会社小糸制作所|Optical unit and vehicle monitor apparatus|
    DE102010041096A1|2010-09-21|2012-03-22|Osram Ag|lighting device|
    JP5722702B2|2011-05-19|2015-05-27|スタンレー電気株式会社|Vehicle lighting|
    JP6162497B2|2013-06-21|2017-07-12|株式会社小糸製作所|Lamp unit and vehicle lamp|
    JP2015230769A|2014-06-03|2015-12-21|株式会社小糸製作所|Vehicular lighting tool|JPWO2020066402A1|2018-09-25|2021-08-30|株式会社小糸製作所|Light irradiation device|
    WO2020080134A1|2018-10-19|2020-04-23|株式会社小糸製作所|Vehicular lamp and rotary reflector|
    US20210341127A1|2018-10-19|2021-11-04|Koito Manufaturing Co., Ltd.|Vehicle lamp, lamp unit, and reflector module|
    EP3869092A4|2018-10-19|2021-12-15|Koito Manufacturing Co., Ltd.|Rotating reflector manufacturing method and rotating reflector|
    JPWO2020137636A1|2018-12-25|2021-11-04|株式会社小糸製作所|Optical unit|
    CN112432137A|2019-08-26|2021-03-02|株式会社小糸制作所|Lens and lamp|
    法律状态:
    2018-08-31| PLFP| Fee payment|Year of fee payment: 2 |
    2019-08-28| PLFP| Fee payment|Year of fee payment: 3 |
    2019-11-15| PLSC| Publication of the preliminary search report|Effective date: 20191115 |
    2020-08-26| PLFP| Fee payment|Year of fee payment: 4 |
    2021-09-13| PLFP| Fee payment|Year of fee payment: 5 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2016202551|2016-10-14|
    JP2017001996|2017-01-10|
    JP2017001996A|JP6951076B2|2016-10-14|2017-01-10|Optical unit|
    FR1759599A|FR3057647A1|2016-10-14|2017-10-13|OPTICAL UNIT|
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