JP6981161B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp.

An in-vehicle lamp that shields a part of the light incident on a lens from a light source by a shade is known (for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-198037

In the vehicle lighting equipment described in Patent Document 1, the boundary between light and dark light incident on the lens is clearly formed by the edge of the shade. Therefore, the boundary of the light distribution pattern irradiated in front of the lens becomes clear, and the change in brightness becomes clear at the boundary of the light distribution pattern. On the other hand, depending on the location of the light distribution pattern, it may be required to moderate the change in brightness at the boundary.

The present invention has been made in view of the above, and an object of the present invention is to provide a lamp for a vehicle capable of gradual change of light and dark at a boundary of a light distribution pattern.

In order to solve the above-mentioned problems and achieve the object, the vehicle lighting equipment of the present invention is arranged between the light source, the lens into which the light from the light source is incident, and the light source and the lens, and the light source. The light-shielding portion comprises a light-shielding portion that shields a part of the light directed from the lens from the light source, and a shade surrounded by the light-shielding portion and having an opening through which the other part of the light directed from the light source toward the lens passes. Is characterized by having a transmission rate changing portion at an edge portion including an end edge on the opening side, in which the transmission rate in the traveling direction of light from the light source toward the lens decreases as the distance from the opening portion increases. ..

In this configuration, it is preferable that the transmittance changing portions are arranged on both sides in the left-right direction in the vehicle-mounted state with respect to the opening.

In these configurations, the transmittance changing portion becomes thicker in the direction parallel to the optical axis of the lens as the distance from the opening increases, and the light directed from the light source toward the lens increases as the thickness increases. It is preferable that the transmittance in the traveling direction of the lens is reduced.

In a configuration in which the thickness of the transmittance changing portion increases as the distance from the opening increases, the transmittance changing portion has a first surface facing the light source and a second surface facing the lens. The second surface is a plane that intersects the optical axis of the lens, and the first surface is inclined with respect to the second surface in a direction in which the opening side is directed from the light source toward the lens. It is preferable to have.

In a configuration in which the transmittance changing portion has a first surface and a second surface, it is preferable that the first surface has a region in which light from the light source is vertically incident.

It is preferable that the distance from the light source to the shade is longer than the distance from the shade to the lens.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a lighting fixture for a vehicle capable of gradual change of light and dark at the boundary of a light distribution pattern.

FIG. 1 is a perspective view showing a vehicle lamp according to the present embodiment. FIG. 2 is a front view showing a vehicle lamp according to the present embodiment. FIG. 3 is a cross-sectional view showing a vehicle lamp according to the present embodiment. FIG. 4 is an enlarged cross-sectional view showing a vehicle lamp according to the present embodiment. FIG. 5 is an enlarged cross-sectional view showing a shade in the vehicle lamp according to the present embodiment. FIG. 6 is an enlarged explanatory view showing an optical path of a luminous flux passing through a shade transmissivity changing portion in a vehicle lamp according to the present embodiment. FIG. 7 is an enlarged explanatory view showing an optical path of a luminous flux passing near an opening of a shade in a vehicle lamp according to the present embodiment. FIG. 8 is an explanatory diagram showing an optical path of a luminous flux in the vehicle lamp according to the present embodiment. FIG. 9 is an explanatory diagram showing an optical path of a luminous flux in a vehicle lamp according to a comparative example. FIG. 10 is a graph showing an irradiation range curve and an irradiation intensity curve of a vehicle lamp according to the present embodiment and a comparative example.

Hereinafter, embodiments of the vehicle lamp according to the present invention will be described with reference to the drawings. The present invention is not limited to this embodiment. In addition, the components in the following embodiments include those that can be easily replaced by those skilled in the art, or those that are substantially the same. In the following description, each of the front-rear, up-down, and left-right directions is the direction in which the vehicle lamp is attached to the vehicle, and indicates the direction when the traveling direction of the vehicle is viewed from the driver's seat. In this embodiment, it is assumed that the vertical direction is parallel to the vertical direction and the horizontal direction is the horizontal direction.

FIG. 1 is a perspective view showing a vehicle lamp 10 according to the present embodiment. FIG. 2 is a front view showing a vehicle lamp 10 according to the present embodiment. FIG. 3 is a cross-sectional view showing a vehicle lamp 10 according to the present embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

The L and R directions in FIGS. 1, 2 and 3, the U and D directions in FIGS. 1 and 2, and the F and B directions in FIGS. 1 and 3 are the vehicle lighting fixtures 10 in the vehicle-mounted state, respectively. Indicates the direction. The L direction is the left direction in the vehicle-mounted state. The R direction is the right direction when the vehicle is mounted. The U direction is the upward direction in the vehicle-mounted state. The D direction is the downward direction in the vehicle-mounted state. The F direction is the front direction in the vehicle-mounted state. The B direction is the rear direction in the vehicle mounted state.

In the present embodiment, the vehicle lamp 10 is a headlamp, a fog lamp, or a cornering lamp provided on the left and right sides of the front portion of the vehicle body. The vehicle lamp 10 may be the same as the one provided on the left side of the front part of the vehicle body and the one provided on the right side of the front part of the vehicle body, or may have a difference in shape. .. Hereinafter, the vehicle lighting fixture 10 provided on the left side of the front portion of the vehicle body will be mainly described, and the description of the vehicle lighting fixture 10 provided on the right side of the front portion of the vehicle body will be simplified or omitted.

In the present embodiment, the vehicle lighting fixture 10 will be described as a headlamp provided at the front portion of the vehicle body to illuminate the front of the vehicle, but the present invention is not limited thereto. The vehicle lighting fixture 10 is a fog lamp provided at the front of the vehicle body to supplementally illuminate the front of the vehicle, a front turn signal lamp provided at the front of the vehicle body to light to indicate the traveling direction of the vehicle to the surroundings, and a vehicle body. A cornering lamp provided at the front to indicate the direction of travel of the vehicle in conjunction with the operation of the switch, a tail lamp provided at the rear of the vehicle body and lit in conjunction with the lighting of the head lamp, and a tail lamp provided at the rear of the vehicle body. A stop lamp that lights up in conjunction with the operation of the brake device, a rear turn signal lamp that lights up at the rear of the vehicle to indicate the direction of travel of the vehicle, and a rear turn signal lamp that lights up to indicate the size of the vehicle in the width direction. It can be used for various lighting tools of vehicles such as a clearance lamp that lights up.

As shown in FIGS. 1, 2 and 3, the vehicle lamp 10 includes a light source 20, a lens 30, and a shade 40. The light source 20 is arranged at the central portion of the member arrangement surface in the front direction of the heat sink 21. The light source 20 has a light emitting surface arranged toward the front. The light source 20 is arranged on or near the optical axis AX of the lens 30. The heat sink 21 is provided with heat dissipation fins at the rear. The heat sink 21 is exemplified by a heat sink 21 made of a metal material having high thermal conductivity, a resin member, or the like, and specifically, an aluminum die-cast heat sink 21 is exemplified. The light source 20 emits light so that the light emitting surface forms a Lambersian distribution. The light source 20 is exemplified by a self-luminous semiconductor type light source such as an LED (Light Emitting Diode) and an EL (Electro Luminescence) in which a light emitting chip is mounted on a substrate. When these are used, the shape of the light emitting surface of the light source 20 is changed according to the shape of the light emitting chip.

The lens 30 is arranged in front of the light source 20 as shown in FIGS. 1, 2 and 3. The lens 30 has an incident surface 30a on which the light from the light source 20 is incident, and an emitting surface 30b that emits the light incident on the incident surface 30a toward the front. For the lens 30, a material that allows light from the light source 20 to pass through, for example, a light-transmitting material exemplified by an acrylic resin and a polycarbonate-based resin is used.

As shown in FIGS. 1, 2 and 3, the lens 30 has a lens body 32, a leg portion 34, and a mounting portion 37. The optical axis AX of the lens 30, that is, the optical axis AX of the lens body 32 is parallel in the front-rear direction. The lens body 32 forms a predetermined light distribution pattern depending on the shape of the incident surface 30a and the shape of the emitting surface 30b. The leg portion 34 is provided so as to extend rearward from each end portion in the left-right direction of the lens body 32, and is provided so as to be curved.

The mounting portion 37 is arranged on the left and right sides of the lens body 32. The mounting portion 37 supports the leg portion 34. The mounting portion 37 has a guide insertion hole 38 and a screw insertion hole 39, respectively. The guide insertion hole 38 is a through hole that penetrates the mounting portion 37, and is provided on the upward side of the mounting portion 37. A guide provided in the heat sink 21 is inserted into the guide insertion hole 38. The screw insertion hole 39 is a through hole that penetrates the mounting portion 37, and is provided on the downward side of the mounting portion 37.

The shade 40 is arranged between the light source 20 and the lens 30 as shown in FIGS. 1, 2 and 3. That is, the shade 40 is arranged in front of the light source 20 and behind the lens 30. The shade 40 blocks a part of the light from the light source 20 toward the lens 30 and passes the other part of the light from the light source 20 toward the lens 30. For the shade 40, a resin material having a high heat resistance is preferably used, and more preferably a resin material having a higher heat resistance than the lens 30 is used in order to mitigate the heat influence from the heat sink 21 side to the lens 30. The shade 40 is provided with a light-shielding property against the light emitted from the light source 20, for example, by adding a coloring material to the resin material.

As shown in FIGS. 1, 2 and 3, the shade 40 has a light-shielding portion 42, an opening portion 44, and a mounting portion 47. The light-shielding unit 42 blocks a part of the light directed from the light source 20 to the lens 30. The opening 44 allows the other part of the light from the light source 20 toward the lens 30 to pass through. The opening 44 is formed in the central region of the shade 40 in the left-right direction and the up-down direction. The light-shielding portion 42 is arranged so as to surround the opening 44 in each of the left, right, up, and down directions of the opening 44. The light-shielding portion 42 has an end side 42c on the opening 44 side.

The light-shielding portion 42 has a transmittance changing portion 46. The transmittance changing portion 46 is formed at the edge portion of the light shielding portion 42 including the end side 42c on the side of the opening 44. In the transmittance changing portion 46, the transmittance of light from the light source 20 decreases as the distance from the opening 44 increases. It is preferable that the transmittance changing portions 46 are arranged on both sides in the left-right direction with respect to the opening 44. The transmittance changing portions 46 may or may not be arranged on both sides in the vertical direction with respect to the opening 44. Hereinafter, a case where the transmittance changing portions 46 are arranged on both sides in the left-right direction with respect to the opening 44 will be described.

The mounting portion 47 has a guide insertion hole 48 and a screw insertion hole 49, respectively. The guide insertion hole 48 is a through hole that penetrates the mounting portion 47, and is provided on the upward side of the mounting portion 47. A guide provided in the heat sink 21 is inserted into the guide insertion hole 48. The screw insertion hole 49 is a through hole that penetrates the mounting portion 47, and is provided on the lower side of the mounting portion 47.

The lens 30 and the shade 40 are overlapped so that the lens 30 is in the front direction and the shade 40 is in the rear direction. Specifically, first, the guide insertion hole 48 of the shade 40 and the guide insertion hole 38 of the lens 30 are inserted into the guide of the heat sink 21. As a result, the screw insertion hole 39 of the lens 30, the screw insertion hole 49 of the shade 40, and the screw hole of the heat sink 21 are arranged in the front-rear direction. After that, the screw is inserted into the screw insertion hole 39 of the lens 30 and the screw insertion hole 49 of the shade 40, and screwed into the screw hole of the heat sink 21. In this way, the lens 30 and the shade 40 are mounted on the heat sink 21.

FIG. 4 is an enlarged cross-sectional view showing a vehicle lamp 10 according to the present embodiment. FIG. 4 is an enlarged view of the region B in FIG. FIG. 5 is an enlarged cross-sectional view showing a shade 40 in the vehicle lamp 10 according to the present embodiment. FIG. 5 is an enlarged view of the region C in FIG. The L direction, the R direction, the F direction, and the B direction in FIGS. 4 and 5 indicate the same directions as those described in the explanations of FIGS. 1 to 3, respectively. In the following, the configuration on the right side of the opening 44 will be described as an example, but the same description can be given for the configuration on the left side of the opening 44 and the like.

As shown in FIGS. 4 and 5, the light-shielding portion 42 has a first surface 42a and a second surface 42b. The first surface 42a faces the light source 20, and the second surface 42b faces the lens 30. The first surface 42a and the second surface 42b are parallel to each other, and both are parallel in the vertical direction and the horizontal direction. The first surface 42a and the second surface 42b are perpendicular to the optical axis AX of the lens 30. Therefore, the distance between the first surface 42a and the second surface 42b is constant. That is, the thickness of the light-shielding portion 42 in the direction parallel to the optical axis AX of the lens 30 is constant. In the present embodiment, the case where the first surface 42a and the second surface 42b are parallel to each other and perpendicular to the optical axis AX of the lens 30 will be described, but the present invention is not limited to this. The first surface 42a and the second surface 42b do not have to be parallel to each other, and may have any form as long as they intersect with the optical axis AX.

[Transmittance change part]
The transmittance of the transmittance changing unit 46 changes according to the position in the extending direction. As shown in FIGS. 4 and 5, the transmittance changing portion 46 has a first surface 46a and a second surface 46b. The first surface 46a faces the light source 20, and the second surface 46b faces the lens 30. The second surface 46b is parallel to the vertical direction and the horizontal direction, and is perpendicular to the optical axis AX of the lens 30. The first surface 46a is inclined with respect to the second surface 46b in the direction from the light source 20 toward the lens 30 on the side of the opening 44. The first surface 46a and the second surface 46b intersect at an end side 42c at an intersection angle θ. The end side 42c may be a straight line, or may be a curved shape exemplified by an arc shape centered on the light source 20. When the end side 42c is curved, it may have a shape different from the arc shape.

The first surface 46a is connected to the first surface 42a, and the second surface 46b is connected to the second surface 42b. The second surface 42b and the second surface 46b form one plane. The first surface 42a and the first surface 46a are connected in a bent state.

Therefore, the distance in the front-rear direction between the first surface 46a and the second surface 46b is 0 at the end side 42c and becomes longer as the distance from the opening 44 increases. Further, the distance in the front-rear direction between the connection portion between the first surface 46a and the first surface 42a and the connection portion between the second surface 46b and the second surface 42b is between the first surface 42a and the second surface 42b. Is equal to the distance of. That is, in the transmittance changing portion 46, the thickness of the transmittance changing portion 46 in the direction parallel to the optical axis AX of the lens 30 is 0 at the end side 42c, and becomes thicker as the distance from the opening 44 increases.

In the transmittance changing portion 46, the rate of change in thickness in the front-rear direction is determined according to the crossing angle θ. As the crossing angle θ of the transmittance changing portion 46 increases, the rate of change in thickness in the front-rear direction increases. As the crossing angle θ of the transmittance changing portion 46 decreases, the rate of change in thickness in the front-rear direction decreases.

The transmittance of the transmittance changing portion 46 changes in the front-rear direction according to the position in the left-right direction (distance from the opening 44), so that the transmittance in the traveling direction of the light from the light source 20 toward the lens 30 is increased. Change. That is, as the thickness of the transmittance changing portion 46 increases in the front-rear direction, the transmittance in the traveling direction of the light from the light source 20 toward the lens 30 decreases. Further, as the thickness of the transmittance changing portion 46 decreases in the front-rear direction, the transmittance in the traveling direction of the light from the light source 20 toward the lens 30 increases.

The first surface 46a of the transmittance changing portion 46 preferably has a region in which the light from the light source 20 is vertically incident. Further, it is preferable that the crossing angle θ in the transmittance changing portion 46 is 25 degrees or more and 50 degrees or less.

[Optical path in the transmittance change part]
FIG. 6 is an enlarged explanatory view showing an optical path of the luminous flux LF passing through the transmittance changing portion 46 of the shade 40 in the vehicle lamp 10 according to the present embodiment. FIG. 7 is an enlarged explanatory view showing an optical path of the luminous flux LF passing near the opening of the shade 40 in the vehicle lamp 10 according to the present embodiment. FIG. 8 is an explanatory diagram showing an optical path of the luminous flux LF in the vehicle lamp 10 according to the present embodiment. FIG. 9 is an explanatory diagram showing an optical path of the luminous flux LF in the vehicle lamp 110 according to the comparative example.

As shown in FIGS. 6, 7 and 8, the luminous flux LF of the light emitted from the light source 20 includes the luminous flux LFi, the luminous flux LFo, the luminous flux LFc, and the luminous flux LFe. The luminous flux LFc passes through the opening 44 of the luminous flux LF and heads toward the lens 30. The luminous flux LFe is shielded from light in the portion of the luminous flux LF excluding the transmittance changing portion 46 of the light shielding portion 42. The luminous flux LFi passes through the innermost portion of the transmittance changing portion 46 of the luminous flux LF, that is, the portion closest to the opening which is the end of the opening 44. The luminous flux LFo passes through the outermost portion of the transmittance changing portion 46 of the luminous flux LF, that is, the portion farthest from the opening which is the end of the opening 44.

As shown in FIG. 6, the luminous flux LFi is incident on the first surface 46a, passes through the inside of the transmittance changing portion 46 by the amount of the interval di, and is emitted from the second surface 46b. The luminous flux LFi reduces the amount of transmitted light according to the length of the interval di, and is refracted toward the outside in the left-right direction. As shown in FIG. 6, the luminous flux LFo is incident on the first surface 46a, passes through the inside of the transmittance changing portion 46 by the amount of the interval do, and is emitted from the second surface 46b. The luminous flux LFo reduces the amount of transmitted light according to the length of the interval do, and is refracted toward the outside in the left-right direction. Here, the interval do is longer than the interval di. Therefore, the transmittance changing portion 46 reduces the amount of light of the luminous flux LFo more than the luminous flux LFi, and refracts the luminous flux LFo more toward the outside in the left-right direction than the luminous flux LFi. As described above, in the transmittance changing portion 46, as the thickness in the front-rear direction increases, the transmittance of the light flux LFi and the light flux LFo from the light source 20 toward the lens 30 decreases.

The first surface 46a of the transmittance changing portion 46 is inclined in a direction closer to the surface orthogonal to the light flux LF with respect to the second surface 46b. Therefore, in the transmittance changing portion 46, the luminous flux LF having a larger amount of light is incident on the first surface 46a as compared with the surface parallel to the first surface 42a. As a result, the transmittance changing portion 46 can partially transmit light.

As shown in FIGS. 7 and 8, the luminous flux LFc passes through the opening 44 and is incident on the incident surface 30a without passing through the transmittance changing portion 46. Therefore, the opening 44 does not reduce the amount of light of the luminous flux LFc, and does not refract the luminous flux LFc in the left-right direction.

On the other hand, as shown in FIG. 9, the vehicle lighting equipment 110 according to the comparative example has a configuration in which the transmittance changing portion 46 is not provided in the shade 40 with respect to the vehicle lighting equipment 10 according to the present embodiment. The shape of the edge is different. The vehicle lamp 110 according to the comparative example is the same as the vehicle lamp 110 according to the present embodiment in other configurations. Hereinafter, the vehicle lamp 110 according to the comparative example will be described with different reference numerals in order to distinguish it from the vehicle lamp 10 according to the present embodiment. The vehicle lamp 110 according to the comparative example includes a light source 120, a lens 130, and a shade 140. The lens 130 has a lens body 132 and legs 134. The lens body 132 has a light distribution surface 136. The shade 140 has a light-shielding portion 142 and an opening portion 144. The light-shielding portion 142 has a first surface 142a, a second surface 142b, and a third surface 142c. The positional relationship between the light source 120, the lens 130, and the shade 140 in the vehicle lamp 110 according to the comparative example is the same as the positional relationship between the light source 20, the lens 30, and the shade 40 in the vehicle lamp 10 according to the present embodiment.

The third surface 142c of the light-shielding portion 142 has a shape along the luminous flux LF from the light source 20. Therefore, the light incident on the edge portion including the end side 142d of the light-shielding portion 142 is shielded by the thickness of the light-shielding portion 142 in the traveling direction of the luminous flux LF. Further, as shown in FIG. 9, the luminous flux LFc passing through the opening 144 passes through the same optical path as in the vehicle lighting tool 10 according to the present embodiment in the vehicle lighting tool 110 according to the comparative example.

FIG. 10 is a graph showing irradiation range curves 51, 151 and irradiation intensity curves 52, 152 of vehicle lamps 10, 110 according to the present embodiment and comparative examples. 0 in the upper graph of FIG. 10 points to a point in the central portion in the left-right direction and the up-down direction. The upper graph in FIG. 10 shows the irradiation range on the right side of the whole. L. in the lower graph in FIG. I. (Luminous Intensity) refers to luminosity. 0 in the lower graph in FIG. 10 is a central portion in the left-right direction, and indicates a point having a luminous intensity of 0. The lower graph in FIG. 10 shows the left-right dependence of luminosity in the central portion in the vertical direction. The upper graph and the lower graph in FIG. 10 correspond to each other in the left-right direction.

In the vehicle lamp 110 according to the comparative example, a part of the luminous flux LF of the light emitted from the light source 120 is shielded by the light-shielding portion 142, and a part of the light flux passes through the opening 144. In this case, the irradiation region of the light distribution pattern irradiated in front of the lens 130 is shown by the irradiation range curve 151 in FIG. Further, the luminous intensity at the boundary of the light distribution pattern (for example, the boundary on the right side) decreases toward the outside (left side of the paper surface in FIG. 10) as shown by the irradiation intensity curve 152 in FIG. In this case, in the light distribution pattern according to the comparative example, the change in luminous intensity at the boundary, that is, the change in brightness at the boundary becomes clear.

On the other hand, in the vehicle lamp 10 according to the present embodiment, the luminous flux LFe from the light source 20 is shielded from the light-shielding portion 42 except for the transmittance changing portion 46. Further, the luminous flux LFc passes through the opening 44, and the luminous flux LFi and the luminous flux LFo pass through the transmittance changing portion 46. In this case, the irradiation region of the light distribution pattern irradiated in front of the lens 30 is the irradiation range curve 151 when the transmittance changing portion 46 is not provided, as shown by the irradiation range curve 51 in FIG. It is in a state of spreading to the outside (the left side of the paper in FIG. 10). Further, the luminous intensity at the boundary of the light distribution pattern (for example, the boundary on the right side) is outside (for example, as shown by the irradiation intensity curve 52 in FIG. 10) as compared with the irradiation intensity curve 152 in the case where the transmittance changing portion 46 is not provided. In FIG. 10, it gradually decreases toward the left side of the paper). That is, in the light distribution pattern according to the present embodiment, the change in luminous intensity at the boundary, that is, the change in brightness at the boundary is gradual with respect to the light distribution pattern according to the comparative example.

[effect]
As described above, the vehicle lamp 10 has a transmittance changing portion 46 in which the transmittance in the traveling direction of the light from the light source 20 toward the lens 30 decreases as the distance from the opening 44 increases. The transmittance of the transmittance changing portion 46 is gradually reduced from the inside to the outside in the left-right direction as compared with the vehicle lamp 110 having no lens. Therefore, the vehicle lamp 10 can moderate the change in brightness at the boundary of the light distribution pattern irradiated in front of the lens 30.

Further, in the present embodiment, the transmittance changing portion 46 of the shade 40 reduces the clarity of the boundary at the end of the light distribution pattern, and the boundary at the end of the light distribution pattern may bring to the driver. Since it is possible to reduce the feeling of strangeness, it is possible to deal with a part that is difficult to deal with in the design of the light distribution pattern by designing the transmittance changing portion 46 of the shade 40.

Further, in the present embodiment, the transmittance changing portions 46 are arranged on both sides in the left-right direction in the vehicle-mounted state with respect to the opening 44. Therefore, in the vehicle lamp 10, the transmittance changing portion 46 can moderate the change in brightness between the left and right boundaries of the light distribution pattern. The transmittance changing portion 46 may be arranged on one side or both sides in the vertical direction in the vehicle mounted state with respect to the opening 44. In this case, the light distribution pattern may be arranged on one side or both sides in the vertical direction. It is possible to reduce the change in the brightness of the boundary between the two.

Further, in the present embodiment, the transmittance changing portion 46 becomes thicker in the direction parallel to the optical axis AX of the lens 30 as the distance from the opening 44 increases, and the thickness increases from the light source 20 to the lens. The transmittance in the traveling direction of the light toward 30 is decreasing. Therefore, by adjusting the thickness of the shade 40 in the direction parallel to the optical axis AX of the lens 30, the transmittance in the traveling direction of the light from the light source 20 toward the lens 30 decreases as the distance from the opening 44 increases. The configuration can be easily realized. The transmittance changing portion 46 is not limited to this form, and may be realized in other shapes, and the material adhesion of the resin material constituting the shade 40 having the transmittance changing portion 46 is controlled. Therefore, it may be in a form in which the transmittance is controlled.

Further, in the present embodiment, the transmittance changing portion 46 has a first surface 46a facing the light source 20 and a second surface 46b facing the lens 30, and the second surface 46b is the lens 30. It is a plane perpendicular to the optical axis AX, and the first surface 46a is inclined toward the lens 30 from the light source 20 on the side of the opening 44 with respect to the second surface 46b. Further, in the present embodiment, the first surface 46a has a region in which the light from the light source 20 is vertically incident. Therefore, the vehicle lamp 10 can reduce the incident angle of the light incident on the first surface 46a from the light source 20. As a result, it is possible to suppress the reflection of the light from the light source 20 on the first surface 46a and efficiently inject the light into the shade 40.

Further, in the present embodiment, the crossing angle θ in the transmittance changing portion 46 is 25 degrees or more and 50 degrees or less. Therefore, the vehicle lamp 10 can more reliably moderate the change in luminous intensity at the boundary, and can reduce glare.

Further, in the present embodiment, the longer the distance between the light source 20 and the shade 40 in the front-rear direction is, the more preferable it is. Further, in the present embodiment, it is preferable that the distance from the light source 20 to the shade 40 is longer than the distance from the shade 40 to the lens 30. In these cases, since the solid angle of the light emitted from the light source 20 and incident on the shade 40 is suppressed to a small size, variations in the manufacturing irradiation range and irradiation intensity, and variations in the region where the luminous intensity at the boundary gradually changes can be observed. Can be reduced.

When the transmittance changing portion 46 is realized by the shape, the thickness in the direction parallel to the optical axis AX of the lens 30 increases as the distance from the opening 44 increases, and the transmittance increases as the thickness increases. Any shape may be used as long as the condition that is reduced is satisfied. For example, the transmittance changing portion may not have a continuous surface as in the first surface 46a of the present embodiment. Specifically, the transmittance changing portion may be formed with a stepped surface on the side of the opening 44 in the direction from the light source 20 toward the lens 30 instead of the first surface 46a of the present embodiment. In this case, the transmittance changing portion has a form in which the thickness in the direction parallel to the optical axis AX of the lens 30 gradually increases as the distance from the opening 44 increases, and the transmittance gradually decreases accordingly. It becomes. Further, instead of the first surface 46a of the present embodiment, the transmittance changing portion may be formed with a curved surface exemplified as a concave surface on the side of the opening 44 in the direction from the light source 20 toward the lens 30. In this case, the transmittance changing portion has a form in which the thickness in the direction parallel to the optical axis AX of the lens 30 increases according to this curved surface as the distance from the opening 44 increases, and the transmittance decreases accordingly. Become.

In the present embodiment, it has been described that the left side and the right side of the vehicle lamp 10 have the same configuration, but the present invention is not limited to this. For example, the crossing angle θ on the left side and the crossing angle θ on the right side may be different values. Specifically, it is preferable to design the crossing angle θ on the side corresponding to the inside of the vehicle to a relatively large value, and to design the crossing angle θ on the side corresponding to the outside of the vehicle to a relatively small value. .. In this case, on the inside of the vehicle, the change in luminous intensity at the boundary can be made large, and when an additional light such as a cornering lamp is turned on, the driver can feel an appropriate lighting feeling and visibility can be improved. Can be improved. On the outside of the vehicle, the area where the luminosity at the boundary changes slowly can be made relatively wide to widen the irradiation range.

10 ... Vehicle lighting, 20 ... Light source, 21 ... Heat sink, 30 ... Lens, 30a ... Incident surface, 30b ... Emission surface, 32 ... Lens body, 34 ... Leg, 37 ... Mounting part, 38 ... Guide insertion hole, 39 ... Screw insertion hole, 40 ... Shade, 42 ... Light-shielding part, 42a ... First surface, 42b ... Second surface, 42c ... Edge, 44 ... Opening, 46 ... Transmittance change part, 46a ... First surface, 46b Second surface, 47 ... mounting part, 48 ... guide insertion hole, 49 ... screw insertion hole, 51 ... irradiation range curve, 52 ... irradiation intensity curve, AX ... optical axis, di ... interval, do ... interval, LF ... luminous flux , LFc ... Luminous flux, LFe ... Luminous flux, LFi ... Luminous flux, LFo ... Luminous flux, θ ... Cross angle.

Claims (5)

Light source and
A lens into which light from the light source is incident and
A light-shielding portion that is arranged between the light source and the lens and blocks a part of the light directed from the light source toward the lens, and is surrounded by the light-shielding portion and passes through another part of the light directed from the light source toward the lens. With a shade with an opening to allow
The light blocking portion, the edge portion including the edge of the opening side, have a transmittance change portion in which the transmittance decreases on the traveling direction of light toward the lens from the light source moves away from the opening,
The thickness of the transmittance changing portion in the direction parallel to the optical axis of the lens increases as the distance from the opening increases, and as the thickness increases, the traveling direction of light from the light source toward the lens increases. A vehicle lamp having a reduced transmittance. The vehicle lighting tool according to claim 1, wherein the transmittance changing portions are arranged on both sides in the left-right direction in a vehicle-mounted state with respect to the opening. The transmittance changing portion has a first surface facing the light source and a second surface facing the lens.
The second surface is a plane that intersects the optical axis of the lens.
The opening side of the first surface is inclined in a direction from the light source toward the lens with respect to the second surface.
The vehicle lamp according to claim 1 or 2. The vehicle lamp according to claim 3 , wherein the first surface has a region in which light from the light source is vertically incident. The vehicle lamp according to any one of claims 1 to 4 , wherein the distance from the light source to the shade is longer than the distance from the shade to the lens.

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