• 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 lamp includes a light source (3) and a projection lens (4) which is configured to project light emitted from the light source (3). The projection lens (4) includes two or more lenses (41) of resin and one or more lenses (43) made of glass, and a refractive ratio R (= Pr / Pt) of a total refraction Pr resin lenses (41) with respect to a Pt refraction of the complete projection lens (4) satisfies a relation of R <1/3. Figure for short: 1
    公开号:FR3078138A1
    申请号:FR1901770
    申请日:2019-02-21
    公开日:2019-08-23
    发明作者:Kazuya Motohashi
    申请人:Koito Manufacturing Co Ltd；
    IPC主号:
    专利说明:

    Title of the invention: Vehicle lamp
    Technical Field [0001] Certain aspects of the present invention relate to a lamp intended for use in a vehicle such as an automobile, and in particular a vehicle lamp suitable for a front light (front lamp) capable of regulating a light distribution d '' an Adaptive Beam-Route (ADB).
    PRIOR ART [0002] As a front lamp for an automobile, ADB light distribution regulation has been proposed as a method for obtaining light distribution in order to prevent the glare of a vehicle (hereinafter referred to as "Front vehicle") in a front area of a personal vehicle, such as a preceding vehicle or an oncoming vehicle in the front area, while increasing the lighting effect of the front area of the personal vehicle. ADB light distribution regulation includes the detection of a front vehicle by a vehicle position detection device, the reduction or extinction of an amount of light in an area in which the detected front vehicle is present, all by intensely illuminating other large areas.
    For several years, ADB light distribution regulation has also been applied to a front lamp using a light emitting element such as an LED as a light source. More specifically, in the headlamp, light from a plurality of LEDs as light sources, i.e., an area of illumination of respective LEDs are combined to form a light distribution in order to '' illuminate the front area of the personal vehicle. In addition, when a front vehicle is detected, LEDs in a lighting area corresponding to the detected front vehicle are dimmed or turned off.
    In ADB light distribution regulation, white light emitted from the plurality of LEDs is projected towards the front area of the personal vehicle by a projection lens to form a plurality of lighting areas, these lighting areas are combined and synthesized appropriately, and an appropriate lighting area is thus formed. However, a pattern shape of the LED light to be projected may vary due to an aberration caused by the projection lens, which makes it difficult to achieve ADB light distribution control with high precision.
    In JP-A-2017-16928, a rear main surface of the projection lens is designed to have a predetermined curvature, so that a direction of aberration of coma is specified and that a uniformity of the pattern of the light to be projected is improved. However, since the technique of JP-A-2017-16928 does not account for aberration, this technique would not take into account a change in a pattern shape of the light caused by the aberration.
    To take account of the aberration, it is envisaged to configure the projection lens with a plurality of lenses, for example, a triple lens. In this case, in order to reduce the weight and the cost of the projection lens, it is also envisaged to configure part of the plurality of lenses with resin lenses. For example, JP-A-H8-68935 provides a technique in which in a camera including a triple lens, a first lens and a second lens are made from resin and a third lens is made from glass.
    Since the lens of JP-A-H8-68935 is applied to a camera which is often used at a so-called normal temperature (or room temperature), a problem caused by a change in room temperature should rarely occur. However, a problem can arise when this type of lens is applied to a projection lens of an automobile lamp. That is, when applied to a projection lens of an automobile lamp, since an ambient temperature varies within a range of 0 ° C to 80 ° C while the lamp is on and off, a change in optical characteristics of the triple lens due to a change in thermal expansion of the lens made from resin, in particular a dot shape due to a spherical aberration should be noted. When the dot shape defined by the projection lens changes with the temperature change, the pattern shape of the lighting area to be projected also changes, and therefore, the reliability of the ADB light distribution control can deteriorate with temperature change.
    Disclosure of the invention [0008] Consequently, one aspect of the present invention provides a vehicle lamp including a projection lens which reduces a change in the shape of a light distribution pattern as a function of a change in temperature, that is, a thermal dependence of a dot shape which represents an imaging performance of the projection lens.
    According to an embodiment of the present invention, there is provided a vehicle lamp including a light source; and a projection lens which is configured to project light emitted from the light source. The projection lens includes two or more resin lenses and one or more glass lenses, and a refraction ratio R (= Pr / Pt) of a total refraction Pr of the resin lenses compared to a refraction Pt of the lens of full projection satisfies a relation of R <l / 3.
    The projection lens can be configured by a triple lens including a first lens having a positive refraction, a second lens having a negative refraction and a third lens having a positive refraction in order from an opposite side towards a light source, the first and second lenses are made from resin, and the third lens is made from glass.
    According to the above configuration, since two lenses or several lenses among the plurality of lenses configuring the projection lens are made from resin, the weight of the projection lens can be reduced. Since the ratio of the refraction of the resin lenses to the refraction of the full projection lens is less than 1/3, the thermal dependence of the dot shape which represents the imaging performance of the contact lens projection can be improved and appropriate ADB light distribution regulation can be achieved.
    In one example, the first lens and the second lens are made from a resin having essentially the same coefficient of thermal expansion.
    In one example, light from the light source is projected and ADB light distribution regulation is accomplished.
    BRIEF DESCRIPTION OF THE DRAWINGS The foregoing and other aspects of the present invention will become more apparent and easier to appreciate from the following description of representative embodiments of the present invention considered in association with the above drawings. seals, in which:
    [Fig. 1] The LIG. 1 is a schematic longitudinal sectional view of a front lamp including a light distribution regulating device according to an embodiment of the present invention;
    [Fig.2] The LIG. 2 is a schematic perspective view showing a lamp unit as viewed from the front;
    [Fig.3] The LIG. 3 is a diagram showing a surface configuration of first to third lenses configuring a projection lens of a first embodiment, to be considered with the formula Math.l and the table Tables 1 which respectively present a design formula and the design values thereof;
    [Fig.4-5] The LIG. 4 is a diagram of a light distribution pattern obtained by combining light emitted from LED chips;
    The LIG. 5 is a graph showing a thermal dependence of a refraction ratio and a rate of change of a focal distance;
    [Fig.6A] The LIG. 6A is a simulation diagram showing a change in dot shape due to a change in temperature of the projection lens of the first embodiment;
    [Fig.6B] The LIG. 6B is a simulation diagram showing a change in dot shape due to a change in temperature of a projection lens from a comparative example;
    [Fig.7] The LIG. 7 is a configuration diagram of a projection lens according to a second embodiment;
    [Fig.8] The LIG. 8 is a diagram showing a surface configuration of first to fourth lenses configuring the projection lens of the second embodiment, to be considered with the formula Math.2 and the table Tables2 which respectively present a design formula and the values of design thereof;
    [Fig.9] The LIG. 9 is a simulation diagram showing a change in dot shape due to a change in temperature of the projection lens of the second embodiment.
    Description of the embodiments Thereafter, embodiments of the present invention will be described with reference to the drawings. The LIG. 1 is a schematic longitudinal sectional view of an HL front lamp of an automobile at which ADB light distribution regulation can be accomplished. In the following description, a light source side in the HL front lamp is designated as a rear, and a front side of the HL front lamp is designated as a front.
    In the HL front lamp, a lamp unit 2 is provided in a lamp housing 1 formed by a lamp body 11 and a front cover 12 made from a light transmitting material. The lamp unit 2 includes a light source 3 and a projection lens 4 provided and held in a unit housing 21 whose inner surface is formed as a light reflecting surface. Light emitted from the light source 3 is irradiated to a front area of the automobile by the projection lens 4 so as to obtain a desired light distribution.
    The LIG. 2 is a schematic perspective view showing the projection lens 4 when viewed from the front. As also shown in the LIG. 1, in the light source 3, a plurality of light emitting elements 30, here, nine light-emitting diode (LED) chips 301 to 309 which emit white light are mounted on a substrate 31 held by a heat sink 32. These LED chips 301 to 309 are arranged in two stages, upper and lower stages, i.e. four LED chips 301 to 304 are mounted in the upper stage and five LED chips 305 to 309 are mounted on the stage lower to be arranged in a horizontal direction. When the LED chips 301 to 309 emit light, the light emitted from the LED chips 301 to 309 is reflected directly or reflected by the interior surface of the unit housing 21 towards the projection lens 4.
    As shown in the LIG. 1, the LED chips 301 to 309 are connected to a light emitting circuit 5 via the substrate 31 and are regulated so that switching on and off, and furthermore a light intensity can be modified individually by the light emitting circuit 5 A lamp switch 51 to be actuated by a conductor is connected to the light-emitting circuit 5, and a distribution of dipped headlights, a distribution of high beams, a distribution of ADB lights can be switched and adjusted by the switch. lamp 51. The light emitting circuit 5 is connected to an on-board camera 52 to accomplish ADB regulation. A front vehicle is detected from a front image of the automobile taken by the on-board camera 52, and light distribution regulation is accomplished so as not to cause glare to the front vehicle.
    As shown in the LIG. 3, in a first embodiment, the projection lens 4 is configured by a triple lens and includes a first lens 41 which is a convex lens having a positive refringence, a second lens 42 which is a concave lens having a negative refringence and a third lens 43 which is a convex lens having positive refringence in order from a front side of the lamp. The first lens 41 to the third lens 43 are arranged coaxially with the optical axes thereof aligned with each other, and the light source 3, that is to say that the LED chips 301 to 309 are arranged in the vicinity of a focal point Eo on a rear side of the lamp of the projection lens 4.
    Among the three lenses configuring the projection lens 4, the first lens 41 and the second lens 42 are made from a light transmitting resin, for example, the first lens is made from PMMA (acrylic resin ) and the second lens 42 is made from PC (polycarbonate resin). The third lens 43 is made from a light-transmitting glass having a refractive index and a dispersion (high Abbe number) lower than that of the second lens 42, for example, N-BK7 (borosilicate crown glass ).
    In order to reduce the aberrations in the projection lens 4, that is to say a chromatic aberration, a spherical aberration, an astigmatism and a coma aberration, among a front surface (first surface) SI and a surface rear (second surface) S2 of the first lens 41, a front surface (third surface) S3 and a rear surface (fourth surface) S4 of the second lens 42, and a front surface (fifth surface) S5 and a rear surface (sixth surface) S6 of the third lens 43, at least the first surface S1 up to the fifth surface S5 are designed as aspherical surfaces. In this embodiment, the first surface SI up to the sixth surface S6 are all designed to be aspherical surfaces on the basis of an aspherical definition formula (1) shown in FIG. 3. Here, z is a quantity of deflection, r is a radial dimension from an optical axis, c is a radius of curvature, k is a conical constant, and al and a2 are aspherical coefficients.
    In the HL front lamp of the first embodiment including the projection lens 4 having the above configuration, the regulation of distribution of low beam or the regulation of distribution of high beam is adjusted by switching the lamp switch 51 by a conductor or the like. In the regulation of dipped beam distribution, the four LED chips 301 to 304 in the upper stage emit light under the regulation of the light emitting circuit 5. The white light emitted from LED chips 301 to 304 is irradiated to a front area of the automobile by the projection lens 4, and in FIG. 4, a light distribution in which lighting zones P1 to P4 are combined, i.e. the distribution of low beams is formed in which a zone below a cut line essentially along a horizontal line H crossing an optical axis Lx of the lens is illuminated.
    In the regulation of high beam distribution, the five LED chips 305 to 309 on the lower floor emit light under the regulation of the light emitting circuit 5. The white light of LED chips 305 to 309 is irradiated towards a front area of the automobile by the projection lens 4 and the light distribution is formed in which lighting areas P5 to P9 are combined. The light distribution is combined with the distribution of low beams PI to P4 described above and the distribution of high beams to illuminate a large area is formed.
    Meanwhile, when the light distribution regulation ADB is adjusted by the driver, the light emitting circuit 5 regulates the distribution of high beam in principle, and a front vehicle in the front area of the automobile is detected on the basis of the image taken by the on-board camera 52. In addition, light from the LED chips corresponding to a lighting zone overlapping the detected front vehicle, in particular a zone overlapping the lighting zones P5 to P9 is attenuated or extinguished. Thus, the lighting area to which the front vehicle belongs is selectively protected from light so as to avoid glare suffered by the front vehicle, while the distribution of ADB light with better visibility in other lighting areas is accomplished.
    In addition, in the projection lens 4 of the first embodiment, a relative density of the resin configuring the first lens 41 and the second lens 42, here, a relative density of PMMA and PC is approximately 1, 2 (g / cm 3 ), or approximately 1/2 of a relative density (2.0 (g / cm 3 )) of the glass of the third lens. Therefore, a weight of the projection lens 4 can be reduced compared to a projection lens in which the first lens 41 and the second lens 42 are made from glass. In addition, the cost can be reduced. The third lens 43 is fabricated from glass to improve the imaging performance of the projection lens 4 as described below.
    Here, taking into account an ambient temperature of the projection lens 4, when the front lamp HL is off, a temperature of the projection lens 4 is essentially equal to a temperature of an outside air, which is approximately 0 ° C to 40 ° C. Meanwhile, when the HL headlamp is on, the temperature of the projection lens 4 is raised to about 80 ° C due to the heat produced in the LED chips 301 to 309.
    In the projection lens 4 of the embodiment, a coefficient of thermal expansion of PMMA of the first lens 41 is approximately 4.7 × 10 V ° C to 7 × CH 7 ° C, and a coefficient of thermal expansion of PC of the second lens 42 is about 5.6 × 10 V ° C. A coefficient of thermal expansion of N-BK7 of the third lens 43 is approximately 30 × 10 7 / ° C. Therefore, when the first lens 41 and the second lens 42 are deformed due to thermal expansion, the lens refringence of the first lens 41 and the second lens 42 changes, and there is an aberration problem in the projection lens 4. Meanwhile, since the third lens 43 is made from glass and has a coefficient of thermal expansion about two orders of magnitude lower than that of the resin, it influences the refraction by the temperature change of the projection lens 4 can be neglected.
    Therefore, the inventor of the present application has considered the influence of the modification of a refringence of the first lens 41 and the second lens 42 made from resin on the imaging performance of the lens In particular, a correlation between a ratio of total refraction of the first lens 41 and of the second lens 42 relative to a refraction of the complete projection lens 4, and the imaging performance of the lens projection 4 has been reviewed. That is to say that a refraction ratio R of a total refraction Pi > 2 of the first lens 41 and of the second lens 42 with respect to a refraction Pt of the complete projection lens 4 has been calculated, and a thermal dependence of the refractive relationship R (= Pi > 2 / Pt) and of the imaging performance in the projection lens 4 was studied.
    When the positive refringence of the first lens 41 has been set to (+ P1) and the negative refringence of the second lens 42 has been set to (-P2), the total refraction Pi > 2 of the first lens 41 and of the second lens 42 is P 1> 2 = PI - P2. When a focal length of the first lens 41 is set to (+ f 1) and a focal length of the second lens 42 is set to (-f2), the refraction PI of the first lens 41 is (+ l / f 1) and the refringence P2 of the second lens 42 is (-l / f2), so that the total refringence Pi 2 is calculated as being P 1> 2 = (1 / fl) - (l / f2).
    When the positive refraction of the third lens 43 is set to (+ P3), the refraction Pt of the complete projection lens 4 is Pt = PI - P2 + P3. That is, when the focal length of the third lens 43 is set to (+ f3), Pt = (1 / fl) - (l / f2) + (l / f3).
    In addition, in order to evaluate the thermal dependence of the imaging performance of the projection lens 4 when the refringence ratio R is modified, the rate of variation of focal distance closely linked to the aberration was measured . The results are shown in FIG. 5. The abscissa is the refractive relationship R and the ordinate is the rate (%) of variation of focal distance. For the projection lens designed so that the refraction ratio R is 1/6, 1/3 and 1/2, the rate of change of focal distance when the temperature is changed by 40 ° C was measured. As a result, it is found that the rate of change increases as the refractive ratio R increases, but in order to set the focal length change rate which essentially influences the shape of the dot to 0.1 (%) or less. as long as the imaging performance, the refringence ratio R is preferably adjusted to satisfy R <l / 3.
    Therefore, in the first embodiment, the refractive relationship R of the total refractive P 1> 2 of the first lens 41 and the second lens 42 relative to the refractive Pt of the complete projection lens 4 is designed to satisfy R <l / 3. That is, R = (P x 2 / Pt) <1/3.
    In order to achieve the above relationship, in the projection lens 4 of the first embodiment, the shapes of the first lens 41 and the second lens 42 which are made from resin, that is to say say that the first surface SI up to the fourth surface S4 are designed as aspherical surfaces as shown in FIG. 3, and the focal length of the first lens 41 and the focal length of the second lens 42 are essentially equal to each other. Thus, insofar as the focal distance f1 of the first lens 41 and the focal distance f2 of the second lens 42 are essentially equal to each other, the total refractive power Pi > 2 has a low value close to “0”. Consequently, the total refractions Pi > 2 of the first lens 41 and of the second lens 42 can be extremely low compared to the refraction Pt of the total projection lens 4, and it is easy to design the refraction ratio R for be less than 1/3.
    In the projection lens 4 of the first embodiment, the coefficients of thermal expansion of each resin configuring the first lens 41 and the second lens 42 are essentially equal to each other. As a result, the refractions of the first lens and the second lens change in opposite directions as a function of the temperature change, and the total refraction Pi 2 is not changed as much even by the temperature change. Thus, the refractive relationship R is easily maintained at a value less than 1/3.
    Even if the type of resin configuring the first lens 41 and the second lens 42 is different and the coefficients of thermal expansion of the resin are different to some extent, the coefficient of thermal expansion of the resin is naturally very high compared to the coefficient of thermal expansion of the glass, so that a difference in the coefficient of thermal expansion can be overlooked. Therefore, the above described effect of improving thermal dependence can be obtained even in this case. If the first lens 41 and the second lens 42 are made from a resin having the same coefficient of thermal expansion, the thermal dependence can be further improved.
    FIG. 6A shows the dot shape as an imaging performance of the projection lens 4 of the first embodiment simulated by the inventor. In the projection lens 4 of the first embodiment shown in FIG. 3, the first lens 41 and the second lens 42 are made from resin and the third lens 43 is made from glass. The total refringence of the first lens 41 and of the second lens 42 is adjusted to a low value close to “0” and the refringence ratio R is designed to satisfy the condition R <1/3.
    FIG. 6B is a simulation diagram of a projection lens as a comparative example in which the first lens 41 to the third lens 43 are all made from resin although having a lens configuration similar to the lens of projection 4 of the first embodiment. Deformation due to thermal expansion is significant in all of the first lens to the third lens and the refractive ratio R does not satisfy the condition R <l / 3.
    Light beams of a required diameter enter from the side of the first lens 41 to the projection lens 4 of this embodiment and the projection lens of the comparative example to form a point. In addition, all focal lengths, RMS (Root Mean Square) and point shape change when the temperature of the projection lens drops to 0 ° C, ° C, 40 ° C and 80 ° C are obtained. The RMS rays, when an angle to the optical axis is 0 ° and 10 °, are obtained. By comparing the change in focal distance, the change in dot shape and the RMS radius value at each temperature, it is determined that the thermal dependence of the dot shape of the projection lens of the embodiment in FIG. 6A is less than that of the projection lens of the comparative example of FIG. 6B.
    The refraction Pt of the complete projection lens 4 of the first embodiment shown in FIG. 6A is 0.175, and the total refraction Pi 2 of the first lens 41 and the second lens 42 is 0.002. Therefore, the refractive ratio R is approximately 1/80, which satisfies the above condition of R <l / 3. In the case where the refraction ratio R is 1/80, as shown in FIG. 5, the focal length variation rate can be improved to 0.08 (%) or less.
    A range of the value of the refraction ratio R corresponds to a case where the rate of change of focal distance is set to 0.1 (%) or less as described above, and the value of the refraction ratio R is set to a lower range in case the rate of change of focal length is more stringent. On the contrary, in the case where the focal length variation rate can be relaxed, it goes without saying that the value of the refractive ratio R can be adjusted over a larger range. For example, in another stricter case, as shown in FIG. 5, if the refractive ratio R is set to satisfy R <1/6, the focal length variation rate can be improved to be close to 0.08 (%).
    In the first embodiment, an example in which the first to sixth surfaces are all designed as aspherical surfaces has been described, but in the present invention, it suffices that at least the first surface up to at the fifth surface are aspherical surfaces and the sixth surface can be a spherical surface. The present invention can also be applied to a case where the convex lenses of the first lens and the third lens and the concave lens of the second lens are menisci, the two surfaces of which are curved in the same direction.
    FIG. 7 is a diagram of a lens configuration of a projection lens 4A of a second embodiment. In the second embodiment, the projection lens is configured by four lenses. That is, the projection lens is configured by a first lens 41 which is a convex lens having a positive refringence, a second lens 42 which is a concave lens having a negative refringence, and a third lens 43 and a fourth lens 44 each of which is a convex lens having positive refringence, in order from a front side of the lamp. Surfaces S1 to S6 are similar to those in the first embodiment, and surfaces S7 and S8 represent a front surface and a rear surface of the fourth lens 44.
    FIG. 8 is a diagram showing the surface configuration of the projection lens 4A of the second embodiment and a design formula and design values thereof. In the projection lens 4A, the first and second lenses 41, 42 are made from resin, and the third and fourth lenses 43, 44 are made from glass. Furthermore, in the second embodiment, a refraction ratio R of a total refraction of Pi 2 of the first lens 41 and of the second lens 42 with respect to a refraction Pt of the complete projection lens 4A including the first lens 41 to the fourth lens 44 is designed to be 1/6. That is to say that R (= 1/1/6) <1/3, which satisfies the condition described in the first embodiment, R = (P x 2 / Pt) <1/3.
    In the projection lens 4A of the second embodiment, the thermal dependence of the imaging performance, when the refringence ratio R was subject to variation, was evaluated, and the same result as in the first embodiment shown in FIG. 5 has been obtained. Consequently, it has been found that it is also preferable to adjust the refraction ratio R to satisfy R <l / 3 in order to adjust the rate of change of focal distance to 0.1 (%) or less in the lens of projection 4A of the second embodiment.
    FIG. 9 is a simulation diagram showing a change in dot shape due to a change in temperature of the projection lens 4A of the second embodiment. It has been found that the thermal dependence of the dot shape is also low in the projection lens in a similar manner to the projection lens of the first embodiment shown in FIG. 6A.
    According to the observation of the inventor, if a projection lens includes two or more resin lenses and one or more glass lenses, and if a refraction ratio R (= Pr / Pt) of a total refringence Pr of the resin lenses and of a refraction Pt of the complete projection lens 4 including the resin lenses and the glass lenses satisfies a condition of R <l / 3, an operational effect similar to the first and second embodiments can to be obtained.
    Here, in the front lamp of the embodiments, an example is shown in which the light source includes nine LED chips to form the light distribution ADB. However, it is not limited to the ADB light distribution and the number of LED chips, the number of lighting areas and furthermore a pattern of each lighting area can be arbitrarily set. The inventive concept of the present invention can also be applied to a lamp using an array of electromechanical microsystems (MEMS) mirrors as a light source. Furthermore, the inventive concept of the present invention can be applied not only to an optical system which projects light directly from the light source but also to a lamp using an optical scanning optical system with light reflected from a rotating mirror and of a swiveling mirror.
    [Math.l]
    : o wwê œ j myrsu-R a * i® w wtçHôfê rawî.e. bone lens c; ““ Bone · ”curvature κ: œmmEWNWE ai. ; eoEFFicœinABi ^ RicuE [0059] [Tables 1]
    Z: OUANTITÉ DE FtêûHlESEMEHT r; DAHE HEIGHT A & RADIAL LENS RECTÎOH e: RADIUS OF CURVATURE k: CONJUGATED CONSTANT “i, -ââ: 'ABPHERIFIC COEFFICIENT [0061] [Tables2]
    AREA RADIUS OF CURVATURE ; Thickness ï CONICAL<12 s IF 41.81 i ss.œ i 0.36 2.81 £ -07 -9.21E -10 î S2 i i w i 43.82 0320-03 1.20EO9 | 83ί 8.80 Ί 5.74E-3S -9.88E-10 ; M § ; 4.39 t o.oô 3 4ÎE-0 4508-09S5i 10.® i -3.02 1.77E-08 4.19E-S5 s SS | gjggg i 1.00 ï 177.73 -4328-08 1.248-18 î sr | 190.60 i 1Q.W î -131.78 s. -357E-Î0 ΐ SS d -46.42 i 40.00 ï -4.S3 ! î 'the -8. 0t-10 S
    权利要求:
    Claims (1)
    [1" id="c-fr-0001]
    Vehicle lamp comprising:
    a light source (3); and a projection lens (4) which is configured to project light emitted from the light source (3), wherein the projection lens (4) includes two or more resin lenses (41) and one or more lenses (43 ) in glass, and a refraction ratio R (= Pr / Pt) of a total refringence Pr of the lenses (41) made of resin with respect to a refraction Pt of the projection lens (4) completes a relation of R < l / 3.
    The vehicle lamp of claim 1, wherein the projection lens (4) is configured by a triple lens including a first lens (41) having positive refraction, a second lens (42) having negative refraction and a third lens ( 43) having positive refringence in an order from an opposite side towards the light source (3), the first lens (41) and the second lens (42) are made from resin, and the third lens (43) is made from glass.
    A vehicle lamp according to claim 1, wherein the projection lens (4) includes a first lens (41) having a positive refraction, a second lens (42) having a negative refraction, a third lens (43) having a positive refraction and a fourth lens (44) having positive refringence in order from an opposite side towards the light source (3), the first lens (41) and the second lens (42) are made from resin, and the third lens (43) and the fourth lens (44) are made from glass.
    Vehicle lamp according to either of Claims 2 and 3, in which the first lens (41) and the second lens (42) are made from a resin having essentially the same coefficient of thermal expansion.
    A vehicle lamp according to any one of claims 1 to 4, in which light from the light source (3) is projected and ADB light distribution control is accomplished.
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    同族专利:
    公开号 | 公开日
    US10753563B2|2020-08-25|
    JP2019145372A|2019-08-29|
    DE102019202434A1|2019-08-22|
    FR3078138B1|2021-08-20|
    CN110186004A|2019-08-30|
    CN110186004B|2021-06-25|
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    法律状态:
    2020-01-02| PLFP| Fee payment|Year of fee payment: 2 |
    2020-12-22| PLFP| Fee payment|Year of fee payment: 3 |
    2021-01-01| PLSC| Publication of the preliminary search report|Effective date: 20210101 |
    2021-12-24| PLFP| Fee payment|Year of fee payment: 4 |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2018-029344|2018-02-22|
    JP2018029344A|JP2019145372A|2018-02-22|2018-02-22|Lighting appliance for vehicle|
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