Vehicle lamp

Abstract

Provided is a vehicle lamp capable of emitting light having a large light distribution angle in accordance with laws and regulations relating to an irradiation area of the vehicle lamp. The vehicle lamp includes: a light source portion including a plurality of light emitting portions arranged side by side in a first direction; a first lens disposed apart from the light source unit and transmitting light emitted from the light source unit; and a reflector disposed between the first lens and the light source unit and below the plurality of light emitting units in a second direction orthogonal to the first direction, the reflector including a reflecting surface that reflects light emitted from the light source unit, the first lens includes a first portion having a positive refractive power in a first direction and a second direction, and a second portion having a refractive power in the second direction smaller than that in the first direction, and the refractive power of the first portion in the second direction is larger than that of the second portion in the second direction.

Description

Technical Field

[0001] The present invention relates to a vehicle lamp. Background Art

[0002] Vehicle lamps that include light-emitting elements such as LEDs (Light Emitting Diodes) are known. For example, Patent Document 1 discloses a vehicle lamp that includes a semiconductor-type light source unit including a light-emitting chip; a lens disposed in front of the light source unit; and a reflector disposed between the lens and the light source unit and vertically below the light-emitting chip.

[0003] <Prior Art Literature>

[0004] <Patent Document>

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 2017-195116 Summary of the Invention

[0006] <Problems to be Solved by the Invention>

[0007] Vehicle lamp specifications specify lower and upper limits for the amount of light required for each illumination area, necessitating control of the illumination angle. An embodiment of the present invention is to provide a vehicle lamp that complies with regulations regarding the illumination area of a vehicle lamp and is capable of emitting light with a wide illumination angle.

[0008] <Methods used to solve the problem>

[0009] A vehicle lamp according to one embodiment of the present invention includes: a light source portion, including a plurality of light-emitting portions arranged in a first direction; a first lens, arranged separately from the light source portion, and transmitting light emitted from the light source portion; a reflector, arranged between the first lens and the light source portion and below the plurality of light-emitting portions in a second direction perpendicular to the first direction, the reflector including a reflecting surface for reflecting light emitted from the light source portion, the first lens including a first portion having positive refractive power in the first and second directions, and a second portion having a refractive power in the second direction smaller than that in the first direction, the refractive power of the first portion in the second direction being larger than the refractive power of the second portion in the second direction.

[0010] <Effects of the Invention>

[0011] According to the embodiment of the present invention, it is possible to provide a vehicle lamp that complies with regulations regarding the illumination area of a vehicle lamp and is capable of emitting light with a wide light distribution angle. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1It is a schematic perspective view showing the overall structure of the vehicle lamp according to the first embodiment.

[0013] Figure 2 It is a schematic front view showing the overall structure of the vehicle lamp according to the first embodiment.

[0014] Figure 3 yes Figure 2 Schematic cross-sectional view along line III-III in FIG.

[0015] Figure 4 yes Figure 2 Schematic cross-sectional view along line IV-IV in FIG.

[0016] Figure 5 It is a schematic front view showing the peripheral structure of a light source unit included in the vehicle lamp according to the first embodiment.

[0017] Figure 6 yes Figure 5 Schematic enlargement of region VI in FIG.

[0018] Figure 7 yes Figure 5 Schematic cross-sectional view along line VII-VII in FIG.

[0019] Figure 8 This is a schematic side view of the first lens and the light source unit, showing the positional relationship between the focal points of the first portion and the second portion of the first lens and the light emitting portion of the light source unit in the vehicle lamp according to the first embodiment.

[0020] Figure 9 This is a schematic front view of the light source unit showing the positional relationship between the focal points of the first portion and the second portion of the first lens and the light emitting surface of the light source unit in the vehicle lamp according to the first embodiment.

[0021] Figure 10 This is a schematic side view of the vehicle lamp showing light reflected by the reflector included in the vehicle lamp according to the first embodiment and then transmitted through the first portion of the first lens.

[0022] Figure 11 This is a schematic front view of first irradiation light transmitted through a first portion of a first lens included in the vehicle lamp according to the first embodiment and emitted therefrom.

[0023] Figure 12 This is a schematic side view of the vehicle lamp showing light reflected by the reflector included in the vehicle lamp according to the first embodiment and then transmitted through the second portion of the first lens.

[0024] Figure 13This is a schematic front view of the second irradiation light transmitted through the second portion of the first lens included in the vehicle lamp according to the first embodiment and emitted.

[0025] Figure 14 This is a schematic front view showing a first example of irradiation light of the vehicle lamp according to the first embodiment.

[0026] Figure 15 This is a schematic front view showing a second example of irradiation light of the vehicle lamp according to the first embodiment.

[0027] Figure 16 It is a schematic plan view showing a second example of irradiation light of the vehicle lamp according to the first embodiment.

[0028] Figure 17 It is a schematic front view showing the overall structure of a vehicle lamp according to a second embodiment.

[0029] Figure 18 yes Figure 17 Cross-sectional view along line XVIII-XVIII in FIG.

[0030] Figure 19 This is a schematic front view showing a first example of irradiation light of the vehicle lamp according to the second embodiment.

[0031] Figure 20 This is a schematic front view showing a second example of irradiation light of the vehicle lamp according to the second embodiment.

[0032] Explanation of symbols

[0033] 1. Light source

[0034] 11. Luminous part

[0035] 12 luminous surfaces

[0036] 13 wires

[0037] 14 electrode pads

[0038] 15 2nd end

[0039] 16 package

[0040] 17 resin parts

[0041] 18 virtual planes

[0042] 2First lens

[0043] 2c optical axis

[0044] 21 Part 1

[0045] 211 front surface

[0046] 212 rear surface

[0047] 22 Part 2

[0048] Part 220

[0049] 221 front surface

[0050] 222 rear surface

[0051] 3 reflectors

[0052] 31 reflective surface

[0053] 32 1st end

[0054] 4Second lens

[0055] 4c center axis

[0056] 100 vehicle lamps

[0057] 110 Vehicle lighting

[0058] 200 irradiation surface

[0059] An off-lights area

[0060] Ap1 1st lighting area

[0061] Ap2 second lighting area

[0062] L, L1, L2, L3, L41, L42 light

[0063] Ls irradiation light

[0064] Ls1 first irradiation light

[0065] Ls2, Ls21, Ls22 second irradiation light

[0066] d Width of luminous surface

[0067] F1 Focus Part 1

[0068] F2 Part 2 Focus

[0069] p luminous surface interval DETAILED DESCRIPTION

[0070] The vehicle lamp according to the embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the following examples illustrate the vehicle lamp for embodying the technical concept of the present invention, and the present invention is not limited to the following. In addition, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments do not mean that the scope of the present invention is limited thereto unless otherwise specified, but are merely illustrative examples. In addition, for the purpose of clarity, the size, positional relationship, etc. of the components shown in the drawings may sometimes be enlarged. In addition, in the following description, the same names and symbols represent components of the same or similar nature, and detailed descriptions are appropriately omitted. As a sectional view, an end view showing only the cut surface is sometimes used.

[0071] In each of the accompanying drawings, directions are represented by orthogonal coordinates including an X-axis, a Y-axis, and a Z-axis. The X-axis, the Y-axis, and the Z-axis are orthogonal to each other. The X-direction along the X-axis corresponds to the first direction. The Y-direction along the Y-axis corresponds to the second direction. The Z-direction along the Z-axis corresponds to the third direction intersecting the first direction and the second direction, respectively. In the following, the X-direction is represented as the first direction X. The Y-direction is represented as the second direction Y. The Z-direction is represented as the third direction Z. The direction indicated by the arrow in the X-direction is represented as the lateral direction. The direction indicated by the arrow in the Y-direction is represented as the upper direction, and the direction opposite to the upper direction is represented as the lower direction. The direction indicated by the arrow in the Z-direction is represented as the front direction, and the direction opposite to the front direction is represented as the rear direction. In the example shown in this specification, the vehicle lamp of the embodiment emits light in the forward direction.

[0072] In this specification, a top view refers to a view of an object from above. A front view refers to a view of an object from the front. A side view refers to a view of an object from the side. In this specification, the term "along the X, Y, and Z axes" includes views where the object is tilted within a range of ±20° relative to these axes.

[0073] In addition, when multiple elements are included in the specification or claims and each element is distinguished, the prefix "first," "second," etc. may be added to the element to indicate the distinction. Furthermore, the objects distinguished in the specification and the claims may differ. Therefore, even if the claims contain the same supplementary structural element as in the specification, the objects identified by the structural element may not be consistent in the specification and the claims.

[0074] [First embodiment]

[0075] <Structure of the Vehicle Lamp of the First Embodiment>

[0076] (Overall structure)

[0077] Reference Figures 1 to 4 The overall structure of the vehicle lamp according to the first embodiment will be described. Figure 1It is a schematic perspective view showing an example of the overall structure of the vehicle lamp 100 according to the first embodiment. Figure 2 This is a schematic front view showing an example of the overall structure of the vehicle lamp 100 according to the first embodiment. Figure 3 yes Figure 2 Schematic cross-section along line III-III. Figure 4 yes Figure 2 Schematic cross-sectional view of line IV-IV in FIG. Figure 1 、 Figure 3 as well as Figure 4 In the illustrated example, the light L1 indicated by the hollow arrow represents the light emitted from the light source unit 1 , and the irradiation light Ls indicated by the hollow arrow represents the irradiation light emitted from the vehicle lamp 100 .

[0078] A vehicle lamp 100 includes a light source unit 1 and a first lens 2. The light source unit 1 includes a plurality of light-emitting units 11 arranged in a first direction X. The first lens 2 is spaced apart from the light source unit 1 and transmits light emitted from the light source unit 1. Furthermore, the vehicle lamp 100 includes a reflector 3 disposed between the first lens 2 and the light source unit 1, below the plurality of light-emitting units 11 in a second direction Y perpendicular to the first direction X. The reflector 3 includes a reflective surface 31 that reflects light L emitted from the light source unit 1. The first lens 2 includes a first portion 21 having positive refractive power in both the first and second directions X and a second portion 22 having a smaller refractive power in the second direction Y than in the first direction X. The refractive power of the first portion 21 in the second direction Y is greater than the refractive power of the second portion 22 in the second direction Y.

[0079] The vehicle lamp 100 is a vehicle lamp that can irradiate light forward in directions intersecting the first direction X and the second direction Y. The vehicle lamp 100 is a lamp such as a headlight mounted on a vehicle such as an automobile. Figures 1 to 4 In the illustrated example, the vehicle lamp 100 can emit light L forward from the light source unit 1 and can irradiate forward the irradiation light Ls emitted from the first lens 2. The light source unit 1 emits the light L as divergent light.

[0080] In the vehicle lamp 100, the refractive power of the second portion 22 in the second direction Y is smaller than the refractive power of the second portion 22 in the first direction X. Therefore, the vehicle lamp 100 can diffuse the irradiation light Ls emitted from the second portion 22 in the second direction Y, which is emitted after the divergent light emitted from the light source unit 1 enters the first lens 2. In this embodiment, by diffusing the irradiation light Ls emitted from the second portion 22 in the second direction Y, the luminous intensity distribution angle of the irradiation light Ls emitted from the first lens 2 in the third direction Z can be increased. This provides the vehicle lamp 100 that complies with regulations regarding the irradiation area of vehicle lamps and can emit light with a wide luminous intensity distribution angle. Regulations regarding the irradiation area of vehicle lamps include, for example, Federal Motor Vehicle Safety Standard (FMVSS) 108 and United Nations Regulations (UNR) 149.

[0081] In the automotive lamp 100, the first portion 21 has positive refractive power in both the first direction X and the second direction Y. This prevents the portion of the illumination light Ls emitted from the first lens 2, which is emitted from the first portion 21, from spreading in both the first direction X and the second direction Y. Furthermore, in the automotive lamp 100, the second portion 22 has a greater refractive power in the first direction X than in the second direction Y. Consequently, the portion of the illumination light Ls emitted from the first lens 2, which is emitted from the second portion 22, from spreading in the first direction X can be reduced compared to the portion of the illumination light Ls emitted from the first lens 2 from spreading in the second direction Y. By preventing the illumination light Ls emitted from the first portion 21 from diffusing in either the first direction X or the second direction Y, and by making the diffusion of the illumination light L in the first direction X smaller than the diffusion of the illumination light Ls emitted from the second portion 22 in the second direction Y, the illumination range of the illumination light L in the first direction X can be limited, thereby improving the luminous intensity of the illumination light Ls emitted from the first lens 2 in the vehicle lamp 100. As described above, in this embodiment, a vehicle lamp 100 can be provided that has a large light distribution angle in the second direction Y and high luminous intensity, and that can emit light that complies with regulations regarding the illumination area of vehicle lamps.

[0082] The vehicle lamp 100 includes a first lens 2 comprising a first portion 21 and a second portion 22. This reduces the volume occupied by the first lens in the vehicle lamp, compared to a configuration in which the first lens having the functions of the first portion 21 and the second portion 22 are separately provided, thereby miniaturizing the vehicle lamp. Furthermore, the reduction in the number of components shortens manufacturing cycle time, thereby reducing manufacturing costs.

[0083] exist Figure 2 and Figure 4 In the illustrated example, the second portion 22 of the first lens 2 in the vehicle lamp 100 is positioned above the first portion 21 in the second direction Y. This configuration allows the vehicle lamp 100 to emit high-beam light directed toward distant locations. As a result, even when using high-beam light, the vehicle lamp 100 can diffuse the illumination light Ls emitted from the second portion 22 in the second direction Y while minimizing the diffusion of the illumination light L in the first direction X compared to the diffusion of the illumination light Ls emitted from the second portion 22 in the second direction Y. Consequently, the vehicle lamp 100 can emit high-beam light with a wide distribution angle in the second direction Y and high brightness, complying with regulations regarding the illumination area of vehicle lamps.

[0084] exist Figure 3 and Figure 4 In the illustrated example, the second portion 22 of the first lens 2 in the automotive lamp 100 is a cylindrical body having positive refractive power in the first direction X and no refractive power in the second direction Y. Since the second portion 22 has no refractive power in the second direction Y, after the light L emitted from the light source unit 1 as divergent light passes through the first lens 2, the portion of the emitted illumination light Ls emitted from the second portion 22 can be diffused in the second direction Y. Consequently, the automotive lamp 100 can increase the luminous intensity distribution angle of the illumination light Ls emitted from the first lens 2 in the second direction Y, thereby emitting light with a wide luminous intensity distribution angle. Furthermore, since the second portion 22 has positive refractive power in the first direction X, the automotive lamp 100 can prevent the portion of the illumination light Ls emitted from the first lens 2 from the second portion 22 from diffusing in the first direction X. Because the illumination light Ls emitted from the second portion 22 does not diffuse in the first direction X, the luminous intensity of the illumination light Ls emitted from the first lens 2 in the automotive lamp 100 can be increased. As described above, the automotive lamp 100 can emit light with a wide luminous intensity distribution angle in the second direction Y, complying with regulations regarding the illumination area of automotive lamps. Furthermore, since the second portion 22 is cylindrical, it is easier to form the second portion 22 than if the second portion 22 had refractive power in both the first direction X and the second direction Y, thereby simplifying the manufacture of the first lens 2 and the automotive lamp 100.

[0085] exist Figure 2 and Figure 4In the illustrated example, the second portion 22 of the first lens 2 in the vehicle lamp 100 includes a portion 220 located below the optical axis 2c of the first lens 2 in the first direction X in the second direction Y. In the vehicle lamp 100, since the second portion 22 includes the portion 220, light can be diffused below the optical axis 2c of the first lens 2 in the first direction X in the second direction Y, thereby increasing the light distribution angle of the vehicle lamp 100.

[0086] exist Figure 2 and Figure 4 In the illustrated example, the first portion 21 of the first lens 2 in the automotive lamp 100 is positioned in the second direction Y below the optical axis 2c of the first lens 2 in the first direction X. This configuration reduces the diffusion of the illumination light Ls that passes through the first portion 21 downward in the second direction Y. Compared to the illumination light Ls that passes through the second portion 22, the illumination light Ls that passes through the first portion 21 is brighter and less diffuse in the first and second directions X and Y. Therefore, for example, when the illumination light Ls that passes through the first portion 21 diffuses downward in the second direction Y, the illumination light Ls reflected from the road surface may cause glare to drivers of oncoming vehicles or preceding vehicles. In the automotive lamp 100, by reducing the diffusion of the illumination light Ls that passes through the first portion 21 downward in the second direction Y, the road surface reflection of the illumination light Ls can be reduced, thereby suppressing glare to drivers of oncoming vehicles or preceding vehicles caused by the road surface reflection.

[0087] exist Figure 1 and Figure 4 In the illustrated example, the reflective surface 31 of the reflector 3 is a cylindrical surface having curvature in the second direction Y and no curvature in the first direction X. Because the reflective surface 31 of the reflector 3 has curvature in the second direction Y, the vehicle lamp 100 can further diffuse the light L incident on the second portion 22 of the first lens 2 in the second direction Y, further increasing the light distribution angle of the illumination light Ls emitted by the first lens 2 in the second direction Y. Furthermore, because the first lens 2 and the reflector 3 share the function of increasing the light distribution angle of the illumination light Ls in the second direction Y, the load on the first lens 2, such as the deflection function and the aberration reduction function, can be reduced, and the design and manufacture of the first lens 2 can be simplified.

[0088] Hereinafter, each component of the vehicle lamp 100 will be described in detail.

[0089] (Light source 1)

[0090] Reference Figures 5 to 7 The light source unit 1 will be described. Figure 5It is a schematic front view showing an example of the structure around the light source unit 1 included in the vehicle lamp 100 according to the first embodiment. Figure 6 yes Figure 5 Schematic enlargement of region VI in FIG. Figure 7 yes Figure 5 Schematic cross-sectional view along line VII-VII in FIG.

[0091] Figures 5 to 7 The light source 1 shown is, for example, an LED. Figure 5 and Figure 7 As shown, the light source unit 1 includes a package 16 , a resin member 17 , and a plurality of light emitting units 11 arranged in a first direction X. Each of the plurality of light emitting units 11 includes a light emitting surface 12 . The light emitting unit 11 can emit light from the light emitting surface 12 .

[0092] The package 16 is, for example, a wiring substrate in which wiring for connecting the light-emitting portion 11 is provided on a base material composed of a sintered body of aluminum nitride or silicon carbide. Alternatively, the package 16 may be a wiring substrate in which an insulating layer is formed on the surface of a metal and a wiring pattern is provided. The metal is copper, aluminum, or the like. The resin component 17 is arranged so as to surround the light-emitting portion 11. The resin component 17 is a component having a light-shielding property and preferably has light reflectivity. The resin constituting the resin component 17 may be a thermosetting resin, a thermoplastic resin, or the like. Specifically, as the resin component 17, a resin containing particles of a light-reflective substance may be cited.

[0093] The light-emitting portion 11 is composed of a light-emitting element and a wavelength conversion element, and emits light L of a desired color. The light-emitting element is, for example, a semiconductor light-emitting element. A light-emitting element that emits blue light, a light-emitting element that emits green light, or a light-emitting element that emits ultraviolet light can use a semiconductor light-emitting element including a nitride semiconductor. Nitride semiconductors include, for example, GaN-based semiconductors such as GaN, InGaN, and AlGaN. An LED that emits red light can use a GaAs-based semiconductor such as InAlGaP or GaInP, GaAs, or AlGaAs. When the vehicle lamp 100 is used as a headlight, the light-emitting portion 11 can emit white light by using a semiconductor light-emitting element that emits blue light and a wavelength conversion component that converts the wavelength of blue light into yellow light.

[0094] The plurality of light-emitting units 11 are arranged in a row in the first direction X. By arranging the plurality of light-emitting units 11 in a row in the first direction X, the number of light-emitting units 11 can be reduced compared to a case where the plurality of light-emitting units 11 comprises a row of the plurality of light-emitting units 11 arranged in the first direction X. As a result, in the vehicle lamp 100 , the cost of the light source unit 1 can be reduced, thereby reducing the cost of the vehicle lamp 100 .

[0095] For example, when the plurality of light-emitting units 11 are arranged in a row in the first direction X, the width of the light source unit 1 in the second direction Y is narrower than when the plurality of light-emitting units 11 comprise a row of the plurality of light-emitting units 11 arranged in the first direction X. Consequently, the light distribution angle of the vehicle lamp 100 in the second direction Y is smaller. In contrast, because the first lens 2 of the vehicle lamp 100 includes the second portion 22, it can emit illumination light Ls with a wide light distribution angle in the second direction Y. Therefore, the vehicle lamp 100 can reduce the cost of the vehicle lamp 100 while emitting illumination light Ls with a wide light distribution angle in the second direction Y. Furthermore, the plurality of light-emitting units 11 do not necessarily need to be arranged in a row in the first direction X; the plurality of light-emitting units 11 may also comprise multiple rows of light-emitting units 11 arranged in the first direction X.

[0096] Figure 5 The light source unit 1 shown includes 24 light emitting units 11. However, the number of the plurality of light emitting units 11 in the light source unit 1 can be appropriately changed according to the specifications of the vehicle lamp 100 and the like.

[0097] Figure 6 Indicates adjacent light-emitting sections 11-1 and 11-2 among the plurality of light-emitting sections 11. Light-emitting section 11-1 includes light-emitting surface 12-1. Light-emitting section 11-2 includes light-emitting surface 12-2. Light-emitting surface width d refers to the width of each of light-emitting surface 12-1 and light-emitting surface 12-2. Light-emitting surface interval p refers to the interval between the light-emitting surfaces 12 of adjacent light-emitting sections 11 among the plurality of light-emitting sections 11. Figure 6 In the example shown, the light emitting surface interval p is the interval between the light emitting surface 12-1 of the light emitting portion 11-1 and the light emitting surface 12-2 of the light emitting portion 11-2. Figure 6 In the example shown, the outer edge shape of each of the light emitting surface 12-1 and the light emitting surface 12-2 is substantially square when viewed from the front. However, the outer edge shape of the light emitting surface is not limited to a square. Figure 6 The width d of the luminous surface shown is 1.1 mm.

[0098] exist Figure 6 In the example shown, the luminous surface interval p is 0.05 mm or less. If the luminous surface interval p is too wide, the area corresponding to the luminous surface interval p in the irradiated light Ls on the irradiated surface perpendicular to the optical axis 2c of the first lens 2 will become darker, potentially increasing the illuminance variation of the irradiated light Ls. In the vehicle lamp 100, by setting the luminous surface interval p to 0.05 mm or less, the area corresponding to the luminous surface interval p in the irradiated light Ls is reduced, thereby reducing the illuminance variation of the irradiated light Ls. In addition, in the vehicle lamp 100, by setting the luminous surface interval p to 0.05 mm or less, the light source unit 1 can be miniaturized, and thus the vehicle lamp 100 can be miniaturized.

[0099] exist Figure 5 In the example shown, the vehicle lamp 100 includes a plurality of wires 13 corresponding to the plurality of light emitting units 11. The plurality of wires 13 are arranged in the same direction with respect to the light emitting units 11 in the second direction Y. The reflector 3 is arranged on the opposite side of the side where the plurality of wires 13 are located with respect to the light emitting units 11 in the second direction Y. Figure 5 In the example shown, the plurality of conductive wires 13 are respectively arranged above the light emitting portion 11. The reflector 3 is arranged below the light emitting portion 11.

[0100] For example, if multiple wires and reflectors are arranged in the same direction relative to the light-emitting portion in the second direction Y, the reflector needs to be arranged so as to avoid the multiple wires. This may create a distance between the light-emitting portion and the reflector, resulting in an increase in the size of the vehicle lamp. However, in the second direction Y, multiple wires 13 are arranged in the same direction relative to the light-emitting portion 11. By arranging the reflector 3 on the side opposite to the side where the multiple wires 13 are located, the reflector 3 does not need to be arranged so as to avoid the multiple wires 13. This allows for a more compact structure of the vehicle lamp 100.

[0101] exist Figure 5 In the example shown, a plurality of electrode pads 14 are arranged along the first direction X on the surface of the package 16 above the light-emitting portion 11. The plurality of electrode pads 14 are electrically connected to the corresponding plurality of light-emitting portions 11. One end of the plurality of wires 13 is electrically connected to the corresponding plurality of electrode pads 14 by wire bonding, and the other ends of the plurality of wires 13 are electrically connected to electrodes provided on a circuit substrate (not shown). The light-emitting portion 11 is driven to emit light based on a driving current or driving voltage supplied from the wires 13 via the electrode pads 14. The wires 13 and the electrode pads 14 can each include Al, Au, or the like.

[0102] like Figure 5 and Figure 7 As shown, in the vehicle lamp 100, when viewed along the third direction Z, the first end 32 of the reflecting surface 31 on the side where the light emitting portion 11 is located overlaps with the second end 15 of the light emitting surface 12 of the light emitting portion 11 on the side where the reflecting surface 31 of the reflector 3 is located. Figure 5 and Figure 7 In the example shown, in order to indicate that the first end portion 32 and the second end portion 15 overlap, the reference numerals of the first end portion 32 and the second end portion 15 are shown together.

[0103] When viewed along the third direction Z, the first end portion 32 overlaps the second end portion 15 . This reduces light loss caused by light L emitted from the light source portion 1 not being reflected by the reflective surface 31 , thereby improving the light extraction efficiency of the vehicle lamp 100 . Furthermore, the light distribution of the illumination light Ls emitted from the first lens 2 in the second direction Y can be controlled based on the position where the first end portion 32 and the second end portion 15 overlap. Consequently, the vehicle lamp 100 can achieve excellent controllability of the light distribution of the illumination light Ls in the second direction Y.

[0104] The light source unit 1 is not limited to a structure in which one package 16 includes a plurality of light emitting units 11 , and may be a structure in which a plurality of packages 16 each including a light emitting unit 11 are arranged, for example.

[0105] (First lens 2)

[0106] exist Figure 2 In the example shown, the outer edge of the first lens 2, as viewed from the front, is formed by cutting away the upper and lower arcuate portions of a substantially circular shape. However, the outer edge of the first lens 2, as viewed from the front, may alternatively be substantially rectangular, substantially circular, substantially elliptical, or substantially polygonal.

[0107] Figures 1 to 4 The front surface 211 of the first portion 21 of the first lens 2 shown has an aspheric shape that is convex toward the front. Furthermore, the rear surface 212 of the first portion 21 has an aspheric shape that is convex toward the rear. The front surface 211 and the rear surface 212 of the first portion 21 differ in at least curvature. However, as long as the first portion 21 has positive refractive power in the first direction X and the second direction Y, the shapes of the front surface 211 and the rear surface 212 of the first portion 21 are not limited to aspheric surfaces, but may also be spherical surfaces, Fresnel lens surfaces, diffraction lens surfaces, etc. The front surface 211 and the rear surface 212 of the first portion 21 may also have substantially the same shape.

[0108] Figures 1 to 4 The front surface 221 of the second portion 22 of the first lens 2 shown is a cylindrical surface that bulges forward in the first direction X. Furthermore, the rear surface 222 of the second portion 22 is a cylindrical surface that bulges rearward in the first direction X. At least the curvature of the cylindrical surface differs between the front surface 221 and the rear surface 222 of the second portion 22. However, as long as the refractive power of the second portion 22 in the second direction Y is less than the refractive power in the first direction X, the shapes of the front surface 221 and the rear surface 222 of the second portion 22 are not limited to cylindrical surfaces and may also include aspherical surfaces, spherical surfaces, Fresnel lens surfaces, diffraction lens surfaces, etc. The shapes of the front surface 221 and the rear surface 222 of the second portion 22 can be substantially the same.

[0109] The first lens 2 is made of a light-transmitting glass material or a resin material. Examples of the resin material include acrylic resin and polycarbonate resin. The first lens 2 can be manufactured by injection molding using a resin material or a glass material.

[0110] Figure 8 This is a schematic side view of the first lens 2 and the light source unit 1 showing an example of the positional relationship between the focal points of the first portion 21 and the second portion 22 of the first lens 2 and the light emitting unit 11 of the light source unit 1 in the vehicle lamp 100 according to the first embodiment. Figure 9 1 is a schematic front view of the light source unit 1 showing an example of the positional relationship between the focal points of the first portion 21 and the second portion 22 of the first lens 2 and the light emitting surface 12 of the light source unit 1 in the vehicle lamp 100 according to the first embodiment. Figure 8 In the illustrated example, a portion of light emitted from the light source unit 1 is represented as light L1 indicated by a solid line and light L2 indicated by a dotted line.

[0111] In the vehicle lamp 100 , the focal point F1 of the first portion 21 of the first lens 2 and the focal point F2 of the second portion 22 of the first lens 2 are respectively located on a virtual plane 18 including the light-emitting surface 12 of the light-emitting portion 11 , and overlap with each other when viewed along the third direction Z.

[0112] exist Figure 8 In FIG, the solid line indicates parallel light incident on the first portion 21 and focused at the focal point F1 of the first portion 21. The dotted line indicates parallel light incident on the second portion 22 and focused at the focal point F2 of the second portion 22. The second portion 22 is a cylinder having a refractive power only in the first direction X. Therefore, the light L2 is focused only in the first direction X and becomes linear light extending in the first direction X. Figure 8 In the example shown, the positions of the focal points F1 and F2 in the third direction Z are almost equal and both are located on the virtual plane 18. Figure 9 As shown in FIG. 1 , when viewed from the front, light L1 becomes a point light focused at the position of focus F1. Light L2 is focused at the position of focus F2 and becomes a linear light with focus F2 continuous in the first direction X. Figure 9 In the example shown, the focus F1 and the focus F2 overlap with each other.

[0113] In the vehicle lamp 100, focal points F1 and F2 are located on the virtual plane 18 and overlap when viewed along the third direction Z. Therefore, the light distribution of the vehicle lamp 100 can be controlled based on the position where the focal points F1 and F2 overlap. This allows for excellent controllability of the light distribution of the vehicle lamp 100. Furthermore, stray light can be suppressed, allowing illumination light Ls to be emitted with no illuminance variations.

[0114] (Reflector 3)

[0115] The reflector 3 is produced by, for example, providing a metal film such as aluminum on the surface of a base material made of a resin material, but is not limited thereto and the reflector 3 can also be produced by cutting and polishing a metal material.

[0116] Reference Figures 10 to 13 The function of the reflector 3 will be described. Figure 10 This is a schematic side view of the vehicle lamp 100 showing an example of light L3 that is reflected by the reflector 3 included in the vehicle lamp 100 according to the first embodiment and then transmits the first portion 21 of the first lens 2 . Figure 11 This is a schematic front view showing an example of the first irradiation light Ls1 which is reflected by the reflector 3 included in the vehicle lamp 100 according to the first embodiment and then transmits through the first portion 21 of the first lens 2 to be emitted. Figure 12 This is a schematic side view of the vehicle lamp 100 showing an example of light L4 that is reflected by the reflector 3 included in the vehicle lamp 100 according to the first embodiment and then transmits the second portion 22 of the first lens 2 . Figure 13 This is a schematic front view showing an example of the second irradiation light Ls2 which is reflected by the reflector 3 included in the vehicle lamp according to the first embodiment and then transmits through the second portion 22 of the first lens 2 to be emitted.

[0117] exist Figure 10 In the example shown, a portion of the light emitted from the light source unit 1 is represented as light L3 indicated by a solid line. Figure 12 In the illustrated example, a portion of the light emitted from the light source section 1 is represented as light L41 indicated by a solid line and light L42 indicated by a dotted line. Figure 11 This is a conceptual diagram of the first irradiation light Ls1 calculated by simulation. Figure 13 This is a conceptual diagram of the second irradiation light Ls2 calculated by simulation.

[0118] exist Figure 10 In the embodiment, light L3 reflected by the reflecting surface 31 of the reflector 3 among the light L emitted from the light source unit 1 is incident on the first portion 21 of the first lens 2, passes through the first portion 21, and is irradiated onto the irradiation surface as the first irradiation light Ls1.

[0119] like Figure 11As shown in FIG. 1 , the first irradiation light Ls1 is irradiated onto the upper portion of the irradiation surface 200. Figure 11 In the figure, the density of the first irradiation light Ls1 represents the level of luminosity. A higher density in the figure represents a higher luminosity. This also applies to the schematic front views of the irradiation light shown later.

[0120] exist Figure 12 In the figure, among the light L emitted from the light source unit 1, the light L41 reflected in the front area of the reflective surface 31 of the reflector 3 is diffused upward by the reflection on the reflective surface 31. The light L41 is incident on the second portion 22 of the first lens 2, passes through the second portion 22, and then irradiates the irradiation surface as the second irradiation light Ls21. Figure 13 As shown, the second irradiation light Ls21 is irradiated onto the upper side of the irradiation surface 200 .

[0121] exist Figure 12 Among the light L emitted from the light source unit 1, the light L42 reflected by the rear region of the reflective surface 31 of the reflector 3 is diffused downward by the reflection on the reflective surface 31. The light L42 enters the second portion 22 of the first lens 2, passes through the second portion 22, and then irradiates the irradiation surface as the second irradiation light Ls22. Figure 13 As shown, the second irradiation light Ls22 is irradiated to the lower side of the irradiation surface 200 .

[0122] <Light Irradiated by the Vehicle Lamp of the First Embodiment>

[0123] Reference Figure 14 and Figure 15 The irradiation light of the vehicle lamp 100 according to the first embodiment will be described. Figure 14 This is a schematic front view showing a first example of the irradiation light Ls of the vehicle lamp 100 according to the first embodiment. Figure 14 This is a conceptual diagram of the irradiation light Ls calculated by simulation. Figure 14 Yes Figure 11 The first irradiation light Ls1 and Figure 13 A diagram showing the synthesis of the second irradiation light Ls2. Figure 15 This is a schematic front view showing a second example of the irradiation light Ls of the vehicle lamp 100 according to the first embodiment. Figure 16 It is a schematic plan view showing a second example of the irradiation light Ls of the vehicle lamp 100 according to the first embodiment.

[0124] like Figure 14 As shown, the vehicle lamp 100 can irradiate the irradiation surface 200 with the irradiation light Ls having a large light distribution angle in the second direction Y and high luminosity.

[0125] (ADB function)

[0126] The vehicle lamp 100 is capable of individually controlling the lighting of the plurality of light-emitting sections 11 in the light source section 1. By individually controlling the lighting of the plurality of light-emitting sections 11, the vehicle lamp 100 is capable of realizing an ADB (Adaptive Driving Beam) function. Here, the ADB function refers to a function that prevents a portion of the illumination light from the vehicle lamp 100 from being irradiated in order to avoid dazzling the driver of a preceding vehicle or an oncoming vehicle traveling in front of the vehicle on which the vehicle lamp 100 is installed, or pedestrians around the vehicle on which the vehicle lamp 100 is installed. For example, the vehicle lamp 100 uses the ADB function to turn off the light-emitting section 11 that is irradiated to the driver of the preceding vehicle or the oncoming vehicle, or pedestrians. This reduces the amount of light irradiated to the driver of the oncoming vehicle or preceding vehicle, or pedestrians, and prevents the driver or pedestrians from being dazzled.

[0127] exist Figure 15 and Figure 16 In the figure, the irradiated light Ls includes a first illuminated area Ap1, a second illuminated area Ap2, and an off-light area An. The first illuminated area Ap1 and the second illuminated area Ap2 are partially illuminated by the plurality of light-emitting units 11, thereby locally irradiating the irradiated surface 200. The off-light area An, located between the first illuminated area Ap1 and the second illuminated area Ap2, is an area on the irradiated surface 200 where no light is irradiated by partially irradiating the plurality of light-emitting units 11. The vehicle lamp 100 utilizes the ADB function to extinguish the light-emitting units 11 corresponding to the positions of the drivers of oncoming vehicles and preceding vehicles, thereby preventing light from irradiating the drivers.

[0128] [Second embodiment]

[0129] Next, a vehicle lamp according to a second embodiment will be described. The same names and symbols as those in the previously described embodiments represent components or structures that are identical or of similar nature, and detailed descriptions thereof will be omitted as appropriate. This also applies to the embodiments described later.

[0130] <Overall Structure of Vehicle Lamp According to Second Embodiment>

[0131] Reference Figures 17 and 18 , the structure of the vehicle lamp according to the second embodiment will be described.

[0132] Figure 17 It is a front view showing an example of the overall structure of a vehicle lamp 110 according to the second embodiment. Figure 18 yes Figure 17 Cross-sectional view along line XVIII-XVIII in FIG. Figure 19 This is a schematic front view showing an example of the irradiation light Ls of the vehicle lamp 110 according to the second embodiment. Figure 20 : is a schematic front view showing an example of the irradiation light Ls of the vehicle lamp 110 according to the second embodiment. Figure 18 In the example shown, a part of the light emitted from the light source unit 1 is represented as light L1 shown by a solid line and light L2 shown by a dotted line. Figure 18 In the illustrated example, the irradiation light emitted from the vehicle lamp 110 is indicated as the irradiation light Ls indicated by the hollow arrow.

[0133] like Figure 17 and Figure 18 As shown in FIG, this embodiment is different from the first embodiment in that it includes a second lens 4 arranged in front of the first lens 2 in the third direction Z.

[0134] The second lens 4 has a substantially rotationally symmetrical surface with its central axis 4c serving as its rotation axis, which is along the direction of light emitted from the second lens 4. The direction of light emitted from the second lens 4 is, for example, the third direction Z. The second lens 4 is formed of a light-transmitting glass material or resin material. Examples of the resin material include acrylic resin and polycarbonate resin. The second lens 4 can be manufactured using a resin or glass material, for example, by injection molding.

[0135] exist Figure 17 In the example shown, the outer edge shape of the second lens 4 as viewed from the front is a shape obtained by cutting off the upper and lower arcuate portions of a substantially circular shape. However, the outer edge shape of the second lens 4 as viewed from the front may also be a substantially rectangular, substantially circular, substantially elliptical, or substantially polygonal shape.

[0136] Figure 18 The front surface 41 of the second lens 4 shown has a spherical shape that is convex forward. In addition, the rear surface 42 of the second lens 4 has a spherical shape that is convex backward. The front surface 41 and the rear surface 42 of the second lens 4 have at least a different curvature. However, as long as the second lens 4 is a surface that is roughly rotationally symmetrical about the central axis 4c as the rotation axis, the shapes of the front surface 41 and the rear surface 42 are not limited to spherical surfaces, and can also be aspherical surfaces, Fresnel lens surfaces, diffraction lens surfaces, etc. In addition, the front surface 41 and the rear surface 42 can also have roughly the same shape.

[0137] exist Figure 18 In the example shown, light L1 emitted from the light source unit 1 is incident on the first portion 21 of the first lens 2, passes through the first portion 21, and then is emitted from the first portion 21. Light L1 emitted from the first portion 21 is incident on the second lens 4, passes through the second lens 4, and then is emitted from the second lens 4 to be illuminated by the vehicle lamp 110 as part of the illumination light Ls.

[0138] exist Figure 18 In the example shown, light L2 emitted from the light source unit 1 is incident on the second portion 22 of the first lens 2, passes through the second portion 22, and then is emitted from the second portion 22. Light L2 emitted from the second portion 22 is incident on the second lens 4, passes through the second lens 4, and then is emitted from the second lens 4 to be illuminated by the vehicle lamp 110 as part of the illumination light Ls.

[0139] <Light Irradiated by Vehicle Lamp of Second Embodiment>

[0140] Reference Figure 19 and Figure 20 Next, the irradiation light of the vehicle lamp 110 according to the second embodiment will be described.

[0141] Figure 19 This is a schematic front view showing a first example of the irradiation light Ls of the vehicle lamp 110 according to the second embodiment.

[0142] Figure 20 This is a schematic front view showing a second example of the irradiation light Ls of the vehicle lamp 110 according to the second embodiment.

[0143] Figure 19 and Figure 20 Each is a conceptual diagram of the irradiation light Ls calculated by simulation.

[0144] Relative to Figure 19 For the irradiation light Ls of the first example shown, Figure 20 The irradiation light Ls of the second example shown includes a light-off area An on the irradiation surface 200 . Figure 20 The illustrated illumination light Ls includes a first illuminated area Ap1 and a second illuminated area Ap2 on either side of the off-area An in the first direction X. The first illuminated area Ap1 and the second illuminated area Ap2 are light that is locally illuminated on the illumination surface 200 by illuminating a portion of the plurality of light-emitting units 11. The off-area An located between the first illuminated area Ap1 and the second illuminated area Ap2 is an area on the illumination surface 200 that is not illuminated by light due to the off-area of the plurality of light-emitting units 11.

[0145] In this embodiment, by placing the second lens 4 in front of the first lens 2 in the third direction Z, the curvature of each lens surface of the first and second lenses 2, 4 can be made more gradual compared to a case where only the first lens 2 is provided. This more gradual curvature of each lens surface facilitates reduction of lens aberrations, thereby improving the contrast between illuminated areas (such as the first illuminated area Ap1 and the second illuminated area Ap2) and unlit areas An in the illumination light Ls. Consequently, in this embodiment, the amount of light directed at drivers of oncoming vehicles and preceding vehicles, as well as pedestrians, can be reduced, thereby preventing glare for drivers and pedestrians.

[0146] Although preferred embodiments have been described in detail above, the present invention is not limited to the above-described embodiments. Various modifications and substitutions can be made to the above-described embodiments without departing from the scope of the claims.

[0147] The numbers, such as ordinal numbers and quantities, used in the description of the embodiments are all for the purpose of illustrating the technology of the present invention in detail, and the present invention is not limited to the numbers shown. In addition, the connection relationships between the structural elements are for the purpose of illustrating the technology of the present invention in detail, and the connection relationships that realize the functions of the present invention are not limited to these.

[0148] The vehicle lamp of the present invention can emit light with a wide luminous intensity distribution angle and is therefore particularly suitable for use as an automotive lamp. While headlights are exemplified in the embodiments of the present invention, the vehicle lamp is not limited thereto. For example, the vehicle lamp can be used for various purposes, such as communication lights or daytime running lights. Furthermore, the vehicle lamp of the present invention is not limited to automotive use. The vehicle lamp of the present invention is not limited to automotive use and can also be used, for example, as a lamp for aircraft such as helicopters and drones.

[0149] Examples of the present invention are as follows.

[0150] <Item 1> A vehicle lamp, comprising: a light source portion, comprising a plurality of light-emitting portions arranged in a first direction; a first lens, arranged separately from the light source portion, for transmitting light emitted from the light source portion; a reflector, arranged between the first lens and the light source portion, and below the plurality of light-emitting portions in a second direction orthogonal to the first direction, the reflector comprising a reflecting surface for reflecting light emitted from the light source portion, the first lens comprising: a first part, having a positive refractive power in the first direction and the second direction; a second part, having a refractive power in the second direction that is smaller than the refractive power in the first direction, the refractive power of the first part in the second direction being larger than the refractive power of the second part in the second direction.

[0151] <Item 2> The vehicle lamp according to <Item 1> above, wherein the second portion is located above the first portion in the second direction.

[0152] <Item 3> The vehicle lamp according to <Item 1> or <Item 2> above, wherein the first portion is located below the optical axis of the first lens in the second direction.

[0153] <Item 4> The vehicle lamp according to any one of <Item 1> to <Item 3> above, wherein the second portion includes a portion located below the optical axis of the first lens in the second direction.

[0154] <Item 5> The vehicle lamp according to any one of <Item 1> to <Item 4> above, wherein the second portion is a cylindrical body having positive refractive power in the first direction and no refractive power in the second direction.

[0155] <Item 6> The vehicle lamp according to any one of <Item 1> to <Item 5> above, wherein the reflecting surface of the reflector is a cylindrical surface having a curvature in the second direction and having no curvature in the first direction.

[0156] <Item 7> The vehicle lamp according to any one of <Item 1> to <Item 6> above, wherein the plurality of light emitting portions are arranged in a row in the first direction.

[0157] <Item 8> The vehicle lamp according to <Item 7> above, wherein a distance between light emitting surfaces of adjacent ones of the plurality of light emitting portions is 0.05 mm or less.

[0158] <Item 9> The vehicle lamp according to the above <Item 8>, wherein the vehicle lamp further has a plurality of wires corresponding to the plurality of light-emitting parts, respectively, and the plurality of wires are respectively arranged in the same direction in the second direction with the light-emitting parts as the reference, and the reflector is arranged in the second direction on the opposite side of the side where the plurality of wires are located with the light-emitting parts as the reference.

[0159] <Item 10> The vehicle lamp according to any one of <Item 1> to <Item 9>, wherein lighting of the plurality of light emitting portions can be individually controlled.

[0160] <Item 11> A vehicle lamp according to any one of <Item 1> to <Item 10> above, wherein, when viewed along a third direction intersecting the first direction and the second direction, the first end portion of the reflecting surface on the side where the light-emitting portion is located overlaps with the second end portion of the light-emitting surface of the light-emitting portion on the side where the reflecting surface is located.

[0161] <Item 12> The vehicle lamp according to any one of <Item 1> to <Item 11> above, wherein the focus of the first part and the focus of the second part are respectively located on a virtual plane including the light-emitting surface of the light-emitting portion, and overlap with each other when viewed along a third direction that intersects the first direction and the second direction.

[0162] <Item 13> The vehicle lamp according to any one of <Item 1> to <Item 12> above, further comprising a second lens arranged at least one of the front and rear sides of the first lens in a third direction intersecting the first direction and the second direction.

Claims

1. A vehicle lamp, comprising: a light source unit including a plurality of light emitting units arranged in a first direction; a first lens disposed apart from the light source portion and transmitting light emitted from the light source portion; and a reflector disposed between the first lens and the light source and below the plurality of light-emitting portions in a second direction perpendicular to the first direction, the reflector including a reflecting surface for reflecting light emitted from the light source; The first lens comprises: The first portion has positive refractive power in the first direction and the second direction; and The second part has a refractive power in the second direction that is smaller than a refractive power in the first direction. The refractive power of the first portion in the second direction is greater than the refractive power of the second portion in the second direction.

2. The vehicle lamp according to claim 1, wherein: The second portion is located above the first portion in the second direction.

3. The vehicle lamp according to claim 1 or 2, wherein: The first portion is located below the optical axis of the first lens in the second direction.

4. The vehicle lamp according to any one of claims 1 to 3, wherein: The second portion includes a portion located below the optical axis of the first lens in the second direction.

5. The vehicle lamp according to any one of claims 1 to 4, wherein: The second portion is a cylindrical body having a positive refractive power in the first direction and having no refractive power in the second direction.

6. The vehicle lamp according to any one of claims 1 to 5, wherein: The reflecting surface of the reflector is a cylindrical surface having a curvature in the second direction and having no curvature in the first direction.

7. The vehicle lamp according to any one of claims 1 to 6, wherein: The plurality of light emitting sections are arranged in a row in the first direction.

8. The vehicle lamp according to claim 7, wherein: The interval between the light emitting surfaces of adjacent light emitting portions among the plurality of light emitting portions is 0.05 mm or less.

9. The vehicle lamp according to claim 8, wherein: The vehicle lamp further comprises a plurality of wires corresponding to the plurality of light emitting parts. The plurality of conductive wires are arranged in the same direction in the second direction with the light emitting portion as a reference. The reflector is arranged on a side opposite to a side where the plurality of conductive wires are located with reference to the light emitting portion in the second direction.

10. The vehicle lamp according to any one of claims 1 to 9, wherein: The lighting of the plurality of light emitting units can be individually controlled.

11. The vehicle lamp according to any one of claims 1 to 10, wherein: When viewed along a third direction intersecting the first and second directions, a first end of the reflective surface on the side where the light emitting portion is located overlaps a second end of the light emitting surface of the light emitting portion on the side where the reflective surface is located.

12. The vehicle lamp according to any one of claims 1 to 11, wherein: The focus of the first portion and the focus of the second portion are respectively located on a virtual plane including a light-emitting surface of the light-emitting portion, and overlap with each other when viewed along a third direction intersecting the first direction and the second direction.

13. The vehicle lamp according to any one of claims 1 to 12, wherein: The optical system further includes a second lens disposed at least one of in front of and behind the first lens in a third direction intersecting the first direction and the second direction.

Images