JP7000695B2 - Vehicle lighting - Google Patents

Description

The present invention relates to a vehicle lamp.

Patent Document 1 describes a vehicle lighting device provided with a lighting device unit capable of forming both a low beam light distribution pattern and a high beam light distribution pattern. For the high beam light distribution pattern, a plurality of light emitting chips are used. Disclosed are vehicle lighting fixtures capable of variable high beam (Adaptive Driving Beam) control that changes the light distribution pattern according to the position of a preceding vehicle or an oncoming vehicle.

Japanese Unexamined Patent Publication No. 2016-39020

By the way, in the case of a configuration in which a large number of light emitting chips are arranged side by side in this way, the light emitting chips are also present at a position away from the lens focal point of the projection lens, and due to off-axis aberrations, the light emitted is located outside the light emitting chips. The light distribution pattern due to the light from the chip may be distorted, but the vehicle lighting fixture of Patent Document 1 does not consider the problem of this off-axis aberration.

The present invention has been made in view of such circumstances, and is a lamp for a vehicle provided with a lamp unit capable of forming both a low beam light distribution pattern and a high beam light distribution pattern. It is an object of the present invention to provide a suppressed vehicle lamp.

The present invention is grasped by the following configurations in order to achieve the above object.
(1) The vehicle lighting equipment of the present invention includes a first light emitting chip for low beam light distribution, a plurality of second light emitting chips arranged horizontally for high beam light distribution, the first light emitting chip, and the second light emitting chip. The lens is provided with a lens that irradiates the front side of the light, a reflector that reflects the light from the first light emitting chip toward the lens, and a shade that blocks a part of the light reflected by the reflector. Includes an upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focal point of the lens, and a lower incident surface on the lower side in the vertical direction from the basic optical axis. The lower incident surface has a shape in which the radius of curvature increases from the optical axis side toward the outer edge of the upper incident surface, and the lower incident surface has a larger radius of curvature from the central side in the horizontal direction to the outer side in the horizontal direction. At the same time, it has a shape in which the vertical cross section is linear.

(2) In the configuration of (1) above, the second light emitting chip is arranged vertically below the rear basic focus of the lens, and the second light emitting chip passes through the light emitting center. The light emitting surface is arranged so as to be inclined upward in the vertical direction so that the light emitting optical axis intersects the upper incident surface.

(3) In the configuration of the above (1) or (2), the first reflecting portion that reflects a part of the light radiated from the second light emitting chip toward the lower incident surface upward in the vertical direction, and the above. It is provided with a second reflecting unit that reflects a part of the light radiated upward in the vertical direction from the second light emitting chip to the lower side in the vertical direction.

(4) In the configuration of the above (3), the first reflecting portion is incident on the lower incident surface among the light radiated directly from the second light emitting chip toward the lower incident surface. The light is reflected so that the amount of light is 1/3 to 6/7.

(5) In any one of the above (1) to (4), the upper side is provided with a light diffusion structure formed on the lower incident surface and the upper incident surface to scatter the light incident on the lens. The light diffusion structure formed on the horizontal center side of the incident surface is set to have a larger amount of light scattering than the light diffusion structure formed on the lower incident surface.

(6) The vehicle lighting equipment of the present invention includes a first light emitting chip for low beam light distribution, a plurality of second light emitting chips arranged horizontally for high beam light distribution, the first light emitting chip, and the second light emitting chip. The lens is provided with a lens that irradiates the front side of the light, a reflector that reflects the light from the first light emitting chip toward the lens, and a shade that shields a part of the light reflected by the reflector. Includes an upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focal point of the lens, and a lower incident surface on the lower side in the vertical direction from the basic optical axis, and passes through the rear basic focal point of the lens. In the vertical cross section along the basic optical axis, the upper end portion of the upper incident surface is located on the front side of the lower end portion of the lower incident surface.

According to the present invention, it is possible to provide a vehicle lamp equipped with a lamp unit capable of forming both a low beam light distribution pattern and a high beam light distribution pattern, and to provide a vehicle lamp with suppressed light distribution collapse. ..

It is a top view of the vehicle provided with the vehicle lighting fixture of the embodiment which concerns on this invention. It is a top view which looked at the lamp unit of the embodiment which concerns on this invention from the front side. It is sectional drawing of the lamp unit of embodiment which concerns on this invention. It is a figure for demonstrating the shape of the incident surface of the lens of embodiment which concerns on this invention, (a) is the sectional view in the vertical direction along the basic optical axis which passes through the rear basic focal point of a lens, (b). Is a horizontal cross-sectional view along the basic optical axis passing through the rear basic focus of the lens. It is a figure explaining the design method of the incident surface for suppressing the light distribution collapse due to the off-axis aberration. It is a figure which shows the case where the light distribution pattern on a screen is separated in the vertical direction. It is a figure for demonstrating the shape of the emission surface of the lens of embodiment which concerns on this invention, (a) is the figure which looked at the lens from the rear side, (b) is the basic light which passes through the rear basic focus of a lens. It is a vertical sectional view along the axis. It is a figure which shows the light distribution pattern on the screen formed in the state before providing the 1st reflection part and the 2nd reflection part of the embodiment which concerns on this invention, (a) is the light radiated from the upper emission surface. It is a figure which shows the light distribution pattern formed by, (b) is a figure which shows the light distribution pattern formed by the light emitted from the lower emission surface, (c) is a figure which shows (a) and (b). It is a figure which shows the light distribution pattern formed by the light from the 2nd light emitting chip in which the light distribution pattern of is multiplexed. It is a figure for demonstrating the light diffusion structure formed on the incident surface of the embodiment which concerns on this invention. It is a figure which shows the light distribution pattern on the screen of the vehicle lamp of the embodiment which concerns on this invention, (a) is the light distribution pattern formed by the light emitted from the upper emission surface, (b) is It is a light distribution pattern formed by the light emitted from the lower emission surface, and (c) is a light distribution pattern formed by the light from the second light emitting chip in which the light distribution patterns of (a) and (b) are multiplexed. It is a figure which shows. FIG. 2 is a diagram showing a light distribution pattern formed by light from a second light emitting chip arranged at a position far from the vertical axis (Y axis) passing through the rear basic focus of the lens on the leftmost side (inside the vehicle). be.

Hereinafter, embodiments for carrying out the present invention (hereinafter referred to as “embodiments”) will be described in detail with reference to the accompanying drawings.
The same elements are numbered the same throughout the description of the embodiment.
Further, in the embodiment and in the drawing, unless otherwise specified, "front" and "rear" indicate the "forward direction" and "reverse direction" of the vehicle, respectively, and "up", "down", and "left", respectively. "," Right "indicate the direction seen from the driver who gets on the vehicle, respectively.

The vehicle lighting fixtures of the embodiment according to the present invention are vehicle headlights (101R, 101L) provided on the left and right in front of the vehicle 102 shown in FIG. 1, and are hereinafter simply referred to as vehicle lighting fixtures.
The vehicle lighting fixture of the present embodiment includes a housing (not shown) opened on the front side of the vehicle and an outer lens (not shown) attached to the housing so as to cover the opening, and is formed by the housing and the outer lens. A lamp unit 10 (see FIG. 2) and the like are arranged in the lamp chamber.
In the following description of the lamp unit 10, the vehicle lamp on the right side of the vehicle will be mainly used as an example, but the parts not otherwise specified are common to the left and right vehicle lamps.

(Lighting fixture unit 10)
FIG. 2 is a plan view of the lamp unit 10 as viewed from the front side, and FIG. 3 is a cross-sectional view of the lamp unit 10.
Note that FIG. 2 is a diagram in which the lens 50 is omitted so that the inside can be seen, and FIG. 3 is a vertical cross-sectional view along the basic optical axis (see the Z axis) passing through the rear basic focal point O of the lens 50.

As shown in FIG. 3, the lamp unit 10 includes a heat sink 20, a first light source 25, a reflector 30, a shade 31, a mounting member 40, a second light source 43, a power supply connector 44, a lens 50, and the like. It mainly includes a first reflecting unit 61 and a second reflecting unit 62.

(Heat sink 20)
The heat sink 20 includes a base portion 21 and a plurality of heat radiation fins 22 integrally formed on the lower side in the vertical direction of the base portion 21 and extending downward in the vertical direction.
Further, a mounting portion 26 on which the first light source 25 is mounted is formed on the upper surface of the base portion 21 in the vertical direction, and the first light source 25 is mounted by the holder 27.

The heat sink 20 is preferably formed of a metal or resin having good thermal conductivity in order to efficiently dissipate the heat generated by the first light source 25. In the present embodiment, the heat sink 20 made of aluminum die-cast is used. There is.

(First light source 25)
The first light source 25 is a light source that radiates light for forming a low beam light distribution pattern, and is a first substrate 23 arranged on the mounting portion 26 and a first light source that radiates light upward in the vertical direction. It includes a first light emitting chip 24 provided on the substrate 23.

In the present embodiment, the LED chip which is a semiconductor type light emitting element is used for the first light emitting chip 24, but the first light emitting chip 24 does not have to be limited to the LED chip, and is, for example, a semiconductor type light emitting element. It may be a certain LD chip (laser diode chip).

(Reflector 30)
The reflector 30 is a member that reflects the light radiated upward from the first light emitting chip 24 toward the lens 50, and the reflecting surface 30a of the reflector 30 is the first light emitting chip 24 so as to open to the front side. It is attached to the base portion 21 of the heat sink 20 so as to cover the top in a semi-dome shape.

(Shade 31)
As shown in FIG. 3, the shade 31 is arranged between the first light source 25 and the lens 50, shields a part of the light reflected on the lens 50 side by the reflector 30, and cuts off the low beam light distribution pattern. It is a member that forms.

More specifically, as shown in FIG. 2, the front edge portion 31a of the shade 31 has a shape adapted to the cut-off line, and the rear basic focus O of the lens 50 is the front edge portion of the shade 31. The shade 31 is arranged so as to be located in the vicinity of the portion forming the upper end portion of the diagonal cut-off line of 31a.
Specifically, as shown in FIG. 3, the shade 31 is arranged so that the rear basic focus O of the lens 50 is located about 1.0 mm rearward from the front edge portion 31a of the shade 31.

(Mounting member 40)
The mounting member 40 is a member to which the shade 31, the second light source 43 described later, the power supply connector 44, the first reflecting portion 61, and the second reflecting portion 62 are mounted.

In the present embodiment, the mounting member 40 is formed as a separate member from the heat sink 20, and the mounting member 40 is fixed to the heat sink 20, but it is not always necessary to configure the mounting member 40 as a separate member from the heat sink 20. A structure corresponding to the mounting member 40 may be integrally built in the structure.

As shown in FIG. 3, in the mounting member 40, the first surface 40a located on the front side is a surface on which the second light source 43 is arranged, and the reason will be described later, but the rear basic focus O of the lens 50 is set. The first surface 40a is formed so as to face diagonally upward in the vertical direction at an angle θ1 with respect to the vertical axis (see the Y axis) through which the lens passes.
In the present embodiment, the first surface 40a is a surface inclined diagonally upward in the vertical direction so that the angle θ1 is about 25 °.

(Second light source 43)
The second light source 43 is a light source that emits light for forming a high beam light distribution pattern, and as shown in FIG. 3, a second substrate 41 arranged on the first surface 40a of the mounting member 40 and a second light source 43. Two second light emitting chips 42 (see FIG. 2) provided so as to be arranged horizontally on the two substrates 41 are provided.

In the present embodiment, the second light emitting chip 42 also uses an LED chip which is a semiconductor type light emitting element like the first light emitting chip 24, but it is not necessary to be limited to the LED chip, for example, a semiconductor type. It may be an LD chip (laser diode chip) which is a light emitting element of the above.

In the present embodiment, as shown in FIG. 2, four pieces are on the outside of the vehicle (left side in the figure) with reference to the vertical axis (see Y axis) passing through the rear basic focal point O of the lens 50 when viewed from the front side of the vehicle. The second light emitting chip 42 is provided, and seven second light emitting chips 42 are provided inside the vehicle (on the right side in the figure), and 11 second light emitting chips 42 are provided so as to be arranged in the horizontal direction. The number of the second light emitting chips 42 may be increased or decreased according to the horizontal light distribution range required for the formed high beam light distribution pattern.

In the case of the vehicle lighting fixture on the left side of the vehicle, when viewed from the front side of the vehicle shown in FIG. 2, the horizontal axis (see Y axis) passing through the rear basic focus O of the lens 50 is left and right in the horizontal direction. The second light emitting chip 42 may be arranged so as to reverse the arrangement.
However, since the relationship between the inside and outside of the vehicle is also reversed between the left side of the vehicle and the right side of the vehicle, if the arrangement state of the second light emitting chip 42 is explained with reference to the inside of the vehicle and the outside of the vehicle, as described above, the rear basic of the lens 50 Four second light emitting chips 42 are provided on the outside of the vehicle (left side in the figure) with reference to the vertical axis (see Y axis) passing through the focal point O, and seven second light emitting chips 42 are provided on the inside of the vehicle (right side in the figure). It will be provided.

Further, in the present embodiment, specifically, the two second light emitting chips 42 on the innermost side of the vehicle (on the right side in the figure) have different horizontal arrangement pitchs from the remaining nine second light emitting chips 42. Although the pitch is made slightly wider, the horizontal arrangement pitch between the second light emitting chips 42 is such that the light distribution pattern formed by the light from the adjacent second light emitting chips 42 is appropriately formed on the screen. It may be set to overlap.

Further, in the present embodiment, the second light source 43 shows a case where a plurality of second light emitting chips 42 are provided on the second substrate 41 which is one common board, but each of the second light emitting chips 42 There may be a configuration such as a second light source unit provided with a plurality of light sources by providing a substrate on the surface.

Then, in the lighting unit 10 of the present embodiment, by controlling the turning off of the second light emitting chip 42 according to the position of the preceding vehicle or the oncoming vehicle, the generation of glare light to the preceding vehicle or the oncoming vehicle is suppressed. In addition, variable high beam (Adaptive Driving Beam) control that changes the high beam light distribution pattern can be performed.

(Power supply connector 44)
The power supply connector 44 is a connector to which an external connector for supplying power is connected, and as shown in FIG. 3, to a second light emitting chip 42 provided on the second substrate 41 and formed on the second substrate 41. It is electrically connected to the conductive pattern of.

(Lens 50)
The lens 50 is a member formed of glass, resin, or the like, and emits light from the first light emitting chip 24 and the second light emitting chip 42 by controlling the light distribution so as to form a predetermined light distribution pattern on the front side. , Is attached to the heat sink 20 via the lens holder 50a.
The specific configuration for controlling the light distribution in the lens 50 will be described later.

The material for forming the lens 50 is not particularly limited, but the lens 50 is preferably made of a resin from the viewpoint of good moldability.
For example, from the viewpoint of easily suppressing the generation of blue spectrocolor, an acrylic resin having a small wavelength dependence of the refractive index is preferable.

On the other hand, when ADB control is performed, the number of second light emitting chips 42 increases, so that the lens 50 may be required to have heat resistance.
In such a case, a polycarbonate resin having excellent heat resistance may be used.

(First Reflector 61)
The first reflecting unit 61 is a member that reflects a part of the light radiated downward in the vertical direction from each of the second light emitting chips 42, and is attached to the mounting member 40.
The reason will be described later, but in this embodiment, the lens 50 radiates downward in the vertical direction at an angle θ2 larger than about 17 ° with respect to the basic optical axis (see Z axis) passing through the rear basic focal point O. It is designed to reflect the light that is generated.

(Second reflector 62)
The second reflecting unit 62 is a member that reflects a part of the light emitted from each second light emitting chip 42 toward the upper side in the vertical direction.
The second reflective portion 62 is provided on the lower side of the shade 31 in the vertical direction, and is attached to the mounting member 40 together with the shade 31.
In the present embodiment, the second reflecting unit 62 is arranged so that the reflecting surface of the second reflecting unit 62 is substantially parallel to the light emitting optical axis OZ passing through the light emitting center of the second light emitting chip 42.

Next, the configuration related to the light distribution control will be described in more detail.
FIG. 4 is a diagram for explaining the shape of the incident surface 51 of the lens 50, and FIG. 4A is a vertical cross section along the basic optical axis (see Z axis) passing through the rear basic focal point O of the lens 50. FIG. 4B is a horizontal cross-sectional view taken along the basic optical axis (see Z-axis) passing through the rear basic focal point O of the lens 50.

Further, FIG. 5 is a diagram illustrating a method of designing an incident surface for suppressing light distribution collapse due to off-axis aberrations.
The lens L shown in FIG. 5 shows a horizontal cross-sectional view of a lens having a basic shape for forming the lens 50.

FIG. 5 shows an example of a state in which a light ray parallel to the optical axis P of the lens L is incident on the lens L from one surface S1 and emitted from the other surface S2, and is incident on one surface S1. The extension line of the previous ray and the extension line of the ray after emission from the other surface S2 are indicated by a alternate long and short dash line, and the point where the extension lines intersect (see the point where the alternate long and short dash line intersects) is defined as a point D.

Then, when the incident position of the light ray incident on one surface S1 is changed along the one surface S1 and the point D is obtained in the same manner as described above, the locus of the point D is shown by a dotted line. The locus shown by this dotted line is the main surface SML of the lens L.
Further, the point where the optical axis P of the lens L and the principal surface SML intersect is the principal point SP of the lens L.

Then, when the main surface SML is a perfect circle (apollon circle) centered on the basic focal length BF, the off-axis aberration is eliminated. Therefore, in order to suppress the off-axis aberration of the lens L, the basic focal length of the lens L is satisfied. The other surface S2 may be formed so that the distance K between the BF and the point D is constant at the focal length F.

Here, if the sine condition violation amount OSC = KF is defined as the evaluation amount indicating the degree of off-axis aberration, those values are zero when the sine condition violation amount OSC is obtained along the main surface SML. The closer it is, the more the off-axis aberration is suppressed.
Since K = W / sinθ'can be expressed, the sine condition violation amount OSC can be described as the sine condition violation amount OSC = W / sinθ'-F.

When the shape of the incident surface is obtained so that the sine condition violation amount OSC becomes small, the point where the basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50 intersects the incident surface 51. The shape has a shape in which the radius of curvature continuously increases in the radial direction (that is, toward the outer peripheral edge of the lens 50) with reference to M (see FIG. 4).

On the other hand, the lens 50 of the present embodiment is determined based on the sinusoidal condition violation amount OSC in consideration of performing light distribution control for the low beam light distribution pattern and light distribution control for the high beam light distribution pattern. The shape is the basic shape, with some modifications.

Specifically, as shown in FIG. 4A, the lens 50 has a basic optical axis (see Z-axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50 as an incident surface 51 on which light is incident. The upper incident surface 52 on the upper side in the vertical direction and the lower incident surface 53 on the lower side in the vertical direction from the basic optical axis (see the Z axis) are provided. It is assumed to have a shape in which the radius of curvature increases from the basic optical axis (see Z axis) side toward the outer edge of the upper incident surface 52.

Therefore, when viewed in the cross section shown in FIG. 4A, the upper incident surface 52 having a curved surface shape protruding toward the rear side is the point M (see the Z axis) where the basic optical axis (see Z axis) and the incident surface 51 intersect. On the side (see FIG. 4), the radius of curvature Rvc is about 150 mm, the radius of curvature increases continuously toward the upper side in the vertical direction, and the radius of curvature Rvt becomes about 300 mm on the outer edge side of the upper incident surface 52. It has become.
On the other hand, when viewed in the cross section (vertical cross section) shown in FIG. 4A, with respect to the lower incident surface 53, in order to suppress the influence on the low beam light distribution pattern, the lower end of the lower incident surface 53 from the point M. It is linear up to (lower end Rvb).
It goes without saying that a curve with a sufficiently large radius of curvature is linear, as is clear from the fact that when the radius of curvature approaches infinity, the curve approaches a straight line as much as possible.

For example, in the present embodiment, since the diameter of the lens 50 is about 68 mm, when viewed in a vertical cross section along the basic optical axis (see Z axis) passing through the rear basic focal point O (see FIG. 3) of the lens 50. The width of the lower incident surface 53 in the vertical direction is about 34 mm, and even if the lower incident surface 53 is a curved surface protruding rearward, it has a vertical cross section along the basic optical axis (see Z axis). When the radius of curvature of the lower entrance surface 53 is sufficiently large with respect to the width of the lower entrance surface 53 (for example, when the radius of curvature is 20 times or more the vertical width of the lower entrance surface 53). That is, if the lower incident surface 53 has a sufficiently gentle curved surface having a constant radius of curvature of about 1000 mm, it can be said that the lower incident surface 53 is sufficiently linear.

Since the upper incident surface 52 and the lower incident surface 53 have the above-mentioned shapes, they pass through the rear basic focal point O (see FIG. 3) of the lens as shown in FIG. 4 (a). In the vertical cross section of the basic optical axis (see Z axis), the upper end UE of the upper incident surface 52 is located on the front side of the lower end Rvb of the lower incident surface 53.

On the other hand, in the cross section (horizontal cross section) shown in FIG. 4B, the radius of curvature of the upper incident surface 52 is the radius of curvature on the point M (see FIG. 4) where the basic optical axis (see Z axis) and the incident surface 51 intersect. The Rhc is about 250 mm, the radius of curvature is continuously increased toward the outside in the horizontal direction, and the radii of curvature Rhl and Rhr are both about 450 mm on the outer edge side of the upper incident surface 52.
As for the lower incident surface 53, the radius of curvature of the horizontal cross section also increases continuously toward the outer peripheral edge side.

That is, the upper incident surface 52 has a shape in which the radius of curvature increases from the basic optical axis (see Z axis) side toward the outer edge portion of the upper incident surface 52 (a shape in which the radius of curvature increases radially). ..
On the other hand, the lower incident surface 53 has a larger radius of curvature from the central (Z-axis) side in the horizontal direction to the outer side in the horizontal direction in consideration of affecting the low beam light distribution pattern and suppressing the collapse of the light distribution. , It is assumed that the vertical cross section has a linear shape.

By forming the incident surface 51 on the rear side convex free curved surface having the upper incident surface 52 and the lower incident surface 53 having such a shape, it is possible to suppress the light distribution collapse due to off-axis aberration. ..

By the way, as shown in FIG. 3, it is on the rear side (about 2.1 mm rear side in this example) of the rear basic focus O of the lens 50 and vertically lower than the rear basic focus O of the lens 50 (in this example). The second light emitting chips 42 are arranged on the horizontal line passing through the point at the position (about 1.8 mm lower), and the light emitted from each second light emitting chip 42 is not disturbed by anything, and each second light emitting chip 42 is not disturbed by anything. When the 2 light emitting chips 42 are not tilted diagonally upward in the vertical direction as in the present embodiment and the lens 50 is irradiated with light, a light distribution pattern formed by the light emitted from each of the second light emitting chips 42 is formed. It may be separated in the vertical direction.

Specifically, there are cases where the light distribution patterns are separated in the vertical direction, as in the light distribution pattern on the screen shown in FIG.
Note that FIG. 6 first reflects light from the second light emitting chip 42 arranged close to the left side (inside the vehicle) of the vertical axis (see Y axis) passing through the rear basic focal point O of the lens 50 in FIG. It simulates the case where the second light emitting chip 42 is arranged without being reflected by the unit 61 or the second reflecting unit 62 and is not tilted diagonally upward in the vertical direction, and the light is irradiated toward the incident surface 51. The VU-VL line in FIG. 6 indicates a vertical reference line on the screen, and the HL-HR line indicates a horizontal reference line on the screen.
Further, FIG. 6 shows the light distribution pattern on the screen by isoluminous lines.
In the subsequent drawings showing the light distribution pattern on the screen, the vertical reference line on the screen is indicated by the VU-VL line, and the horizontal reference line on the screen is indicated by the HL-HR line. The pattern shall be indicated by isoluminous lines.

That is, the light distribution pattern formed by the light incident on the lens 50 from the upper incident surface 52 and radiated to the front side appears on the lower side in the vertical direction on the screen, and is incident on the lens 50 from the lower incident surface 53. A light distribution pattern formed by the light emitted to the front side may appear on the upper side in the vertical direction on the screen, and a light distribution pattern separated in the vertical direction may be formed.

Therefore, in the present embodiment, as described below, the direction in which the light of the second light emitting chip 42 is emitted is adjusted, and the amount of light is further adjusted by the first reflecting unit 61 to direct the light of the lens 50 to the front side. By adjusting the shape of the emission surface 54 to irradiate the light, it is possible to form a rectangular and better light distribution pattern as a whole, which will be specifically described below.

FIG. 7 is a diagram for explaining the shape of the exit surface 54 of the lens 50, and FIG. 7 (a) is a view of the lens 50 viewed from the rear side (a view of the incident surface 51 viewed from the front). 7 (b) is a vertical cross-sectional view taken along the basic optical axis (see Z axis) passing through the rear basic focal point O of the lens 50.

As shown in FIG. 7B, the lens 50 has an upper emission surface 55 vertically above the basic optical axis (see Z axis) passing through the rear basic focus O (see FIG. 3) of the lens 50 as an emission surface 54. And a lower emission surface 56 on the lower side in the vertical direction from the basic optical axis (see the Z axis).
As for the lower emitting surface 56, as shown in FIG. 7A, the first lower emitting surface 56a on the horizontal center side and the left outer side in the horizontal direction (inside the vehicle) when viewed from the incident surface 51 side. Has an emission surface 56b and an emission surface 56c on the right outer side (outside the vehicle) in the horizontal direction.

In the following, when the exit surface 56b and the exit surface 56c are collectively referred to, they may be referred to as the second lower exit surfaces 56b and 56c.
That is, the lower emission surface 56 includes a first lower emission surface 56a on the central side in the horizontal direction and two second lower emission surfaces 56b and 56c located on the outer side in the horizontal direction of the first lower emission surface 56a. have.

The first lower emission surface 56a is a region in which light from the first light emitting chip 24 (see FIG. 3) that emits light for forming a low beam light distribution pattern is mainly emitted toward the front side. The second lower emitting surface 56b, 56c horizontally outside from the first lower emitting surface 56a is a region where the light from the first light emitting chip 24 (see FIG. 3) is not so much irradiated toward the front side, that is, It is a region that does not greatly contribute to the formation of the low beam light distribution pattern.

Specifically, when a point light source is assumed to be the rear basic focus O of the lens 50 (see FIG. 7B), the horizontal spread angle of the light emitted from the point light source (rear of the lens 50). The region where light whose basic optical axis (see Z axis) passing through the basic focal point O is within 28 degrees is incident from the incident surface 51 and is irradiated to the front side is defined as the first lower exit surface 56a. The region outside the horizontal direction is defined as the second lower exit surface 56b, 56c.

As shown in FIG. 6 in the high beam light distribution pattern, the shape of the second lower exit surfaces 56b and 56c, which contribute less to the low beam light distribution pattern, is adjusted so as not to affect the low beam light distribution pattern. The separation is suppressed and the light distribution pattern is close to a rectangular shape.
As will be described later, the same thing is done on the upper exit surface 55.

That is, with respect to the second lower light source surfaces 56b and 56c, as shown in FIG. 7A, the rear side of the lens 50 is from the position Q1 on the side of the first lower light source surface 56a on the upper side in the vertical direction to the outer peripheral edge side. When a point light source is assumed for the basic focal point O (see FIG. 7 (b)), the light from the point light source is formed in a shape that irradiates the lower side in the vertical direction on the screen.

More specifically, the position of the outer peripheral edge portion on the outer side in the horizontal direction from the position Q1 is set as the position Q2, the position of the outer peripheral edge portion on the lower side in the vertical direction from the position Q1 is set as the position Q3, and the straight line connecting the position Q2 and the position Q3. The position that becomes the apex of the right-angled triangle other than the position Q2 and the position Q3 when the right-angled triangle formed by connecting the position Q1, the position Q2, and the position Q3 is line-symmetrical is defined as the position Q4.

Assuming a rectangular shape connecting these four positions (position Q1, position Q2, position Q3 and position Q4), the closer to position Q2 from position Q1, the light is emitted to the lower side in the vertical direction on the screen. At position Q2, the second lower part is shaped to irradiate light 1.5 degrees below the horizontal reference line on the screen (the lower side is shown as a minus in FIG. 7). The side emitting surfaces 56b and 56c are formed.

Similarly, the closer to the position Q1 from the position Q1, the light is emitted to the lower side in the vertical direction on the screen, and at the position Q3, the light is 1.5 degrees below the horizontal reference line on the screen. The second lower exit surfaces 56b and 56c are formed in a shape that irradiates light toward (the lower side is shown as a minus in FIG. 7).

Further, the closer to the position Q1 from the position Q1, the light is irradiated to the lower side in the vertical direction on the screen. However, if the lens 50 is virtually located up to the position of the position Q4, the screen is displayed at the position Q4. The second lower exit surfaces 56b and 56c are formed in a shape that irradiates light toward 1.5 degrees below the horizontal reference line above (the lower side is shown as a minus in FIG. 7). There is.
However, in reality, since the lens 50 does not exist up to the position Q4, the outer peripheral edge portion, which is the end of the actual lens 50, does not reach the lower side of 1.5 degrees.

In the above, the parts from the position Q1 to the position Q2, the position Q3 and the position Q4 have been described, but at each point on the line connecting the position Q1 to the position Q2 and the position Q4 and on the line connecting the position Q4 and the position Q3. The same is true for the direction.
Therefore, with respect to the second lower emission surfaces 56b and 56c, as shown in FIG. 7A, the position Q1 on the first lower emission surface 56a side on the upper side in the vertical direction (that is, the basic optical axis Z side (point M). When a point light source is assumed to be the rear basic focal point O (see FIG. 7 (b)) of the lens 50 radially from the position of the side) to the outer peripheral edge side, the light from the point light source is vertical on the screen. It is formed in a shape that illuminates the lower side in the direction.

Then, the light emitted from the lower emission surface 56 to the front side forms a light distribution pattern that appears on the upper side in the vertical direction on the screen. As described above, the shapes of the second lower emission surfaces 56b and 56c are formed. When is adjusted, the light is distributed so that the upper side of the upper light distribution pattern shown in FIG. 6 is located on the lower side and slightly spreads in the horizontal direction. It is extended to the lower light distribution pattern side that appears on the screen, and the light distribution is controlled in the direction in which the two separated light distribution patterns are integrated.

On the other hand, the light emitted from the upper emitting surface 55 to the front side forms a light distribution pattern that appears on the lower side in the vertical direction on the screen. By adjusting the shape of the upper emitting surface 55, it is shown in FIG. By expanding the light distribution pattern on the lower side to the upper side and making it closer to a rectangular shape, it is integrated with the light distribution pattern that appears on the upper side in the vertical direction on the screen formed by the light from the lower exit surface 56. When two light distribution patterns are multiplexed, the light distribution pattern can be made closer to a rectangular shape.
Hereinafter, the upper exit surface 55 will be described.

As shown in FIG. 7B, the upper emission surface 55 irradiates the light from the point light source toward the front side from the lens 50 when a point light source is assumed to be the rear basic focus O toward the upper side in the vertical direction. At the time of this, the light is distributed to the lower side on the center side of the lens 50, and the light is distributed to the upper side on the upper side of the lens 50.

More specifically, on the lower side in the vertical direction of the upper emission surface 55 (the boundary side with the lower emission surface 56), as shown by the light ray L1 (overlapping with the Z axis) shown in FIG. 7 (b), The light from the point light source is emitted almost horizontally, but it is formed in a shape that continuously irradiates the light from the point light source to the lower side in the vertical direction toward the upper side in the vertical direction, and irradiates the lowermost side. As shown by the light beam L2, the light is irradiated at 1.2 degrees below the horizontal reference line on the screen (in FIG. 7, the lower side is shown as a minus). ..

After that, the upper exit surface 55 is further formed in a shape that continuously irradiates the light from the point light source upward in the vertical direction toward the upper side in the vertical direction. As shown by the light beam L3, the light is irradiated toward 0.7 degrees above the horizontal reference line on the screen in the vertical direction.

In this way, when the shape of the upper emission surface 55 is assumed to be a point light source at the rear basic focus O toward the upper side in the vertical direction, the light from the point light source is irradiated downward in the vertical direction. Assuming a shape that illuminates the upper side in the vertical direction, the rounded portion on the lower side in the vertical direction in the lower light distribution pattern shown in FIG. 6 is arranged to distribute light upward, and the lower side in the vertical direction of the light distribution pattern. It is possible to widen the light distribution range to the upper side in the vertical direction while making the light closer to a rectangular shape.

Further, when the light emitted from the upper emitting surface 55 is continuously distributed downward in the vertical direction toward the upper side in the vertical direction and then distributed upward in the vertical direction to form a light distribution pattern, the lens 50 is formed. It is possible to suppress the influence of the spectrum of light, and it is also possible to suppress the spectral color appearing at the lower end of the light distribution pattern formed by the light emitted from the upper emission surface 55.

Then, the exit surface 54 is formed on a convex free curved surface on the front side including the lower exit surface 56 having the above-mentioned shape and the upper exit surface 55, and as shown in FIG. 3, the upper exit surface 55 is formed. The light emitting surface is inclined upward in the vertical direction so that the light emitting optical axis OZ passing through the light emitting center of the second light emitting chip 42 intersects the intermediate portion in the vertical direction of the upper incident surface 52 so as to increase the amount of light emitted from the light emitting chip 42. When the second light emitting chip 42 is arranged so as to do so, the light distribution pattern as shown in FIG. 8 is formed.

FIG. 8 is a diagram showing a light distribution pattern on a screen formed in a state before the first reflecting portion 61 and the second reflecting portion 62 are provided in the present embodiment, and FIG. 8A is a diagram showing an upper emitting surface 55. 8 (b) is a diagram showing a light distribution pattern formed by the light emitted from the lower emission surface 56, and FIG. 8 (b) is a diagram showing a light distribution pattern formed by the light emitted from the lower emission surface 56. c) is a diagram showing a light distribution pattern formed by light from a second light emitting chip 42 in which the light distribution patterns of FIGS. 8 (a) and 8 (b) are multiplexed.

As can be seen from FIG. 8, the light distribution pattern formed by the light emitted from the upper emitting surface 55 (see FIG. 8A) is also the light distribution formed by the light emitted from the lower emitting surface 56. The patterns (see FIG. 8B) also have a shape that is fairly close to a rectangular shape as a whole, and are in a state where they can sufficiently overlap in the vertical direction when these light distribution patterns are multiplexed. ..

Therefore, as shown in FIG. 8 (c), the light distribution pattern formed by multiplexing the light distribution patterns shown in FIGS. 8 (a) and 8 (b) is cracked as shown in FIG. In addition to being something that does not cause light, it is quite close to a rectangular shape as a whole.

On the other hand, looking at the light distribution pattern in FIG. 8 (b), there is a high-intensity band on the upper side in the vertical direction. Therefore, even in the light distribution pattern in FIG. 8 (c), a high-intensity band appears slightly on the upper side in the vertical direction. ing.
Therefore, in the present embodiment, as shown in FIG. 3, the first reflective portion 61 is mainly provided to further suppress the separation of the high luminous intensity band.

Specifically, as described above with reference to FIG. 3, of the light radiated downward from each second light emitting chip 42 in the vertical direction, the basic light passing through the rear basic focal point O of the lens 50. Light emitted downward in the vertical direction at an angle θ2 larger than about 17 ° with respect to the optical axis (see Z axis) is reflected toward the upper incident surface 52 and is reflected from the lower incident surface 53 to the lens 50. I try to limit the incident light.
That is, the first reflecting unit 61 reflects a part of the light emitted from each of the second light emitting chips 42 to the lens 50 toward the lower incident surface 53 upward in the vertical direction, whereby the upper incident surface The amount of light incident on the 52 is greater than the amount of light incident on the lower incident surface 53.

In the present embodiment, the amount of light incident on the lower incident surface 53 is less than half of the light emitted directly from the second light emitting chip 42 toward the lower incident surface 53 in the first reflecting unit 61. Light is reflected toward the upper incident surface 52 so as to be (in this example, almost halved).
The amount of light does not necessarily have to be half or less, and it is preferable that the amount of light is, for example, about 1/3 to 6/7.

By doing so, the amount of light of the light distribution pattern formed by the light incident on the lens 50 from the lower incident surface 53 and emitted from the lower emitting surface 56, that is, the light distribution pattern appearing on the upper side of the screen is halved. can do.

As shown in FIG. 3, the light reflected by the first reflecting unit 61 is emitted from the upper emitting surface 55 about 5 degrees above the horizontal reference line on the screen, and is shown in FIG. The light is distributed on the outer periphery of the upper side in the vertical direction of the light distribution pattern shown in (a).

Further, in the embodiment, a light diffusion structure for diffusing light is provided on the incident surface 51 so that the light distribution is uniform.
FIG. 9 is a diagram for explaining a light diffusion structure formed on the incident surface 51.
In addition, in FIG. 9, a figure showing the shape of the light diffusion structure is also shown as an enlarged view.
As shown in FIG. 9, the light diffusion structure divides the incident surface 51 into four regions (first region 57a, second region 57b, third region 57c, and fourth region 57d) and adjusts the amount of light diffusion. There is.

As shown in the enlarged view, the light diffusion structure formed in each region (first region 57a, second region 57b, third region 57c, and fourth region 57d) has a structure in which a plurality of irregularities are formed. In order to adjust the amount of light diffusion, the amount of unevenness (height of unevenness) is set according to each region.
In the present embodiment, the light diffusion structure is shown in which rounded irregularities are formed. However, in the light diffusion structure, the ridgeline may be rectangular or rhombic, and the square pyramid may be concave or convex. It may be a structure.
Further, there may be a portion of the incident surface 51 having the basic shape between the convex portions or the uneven portion, and the amount of light diffusion may be adjusted by adjusting the density of the convex portion or the concave portion and the convex portion.

Specifically, in the first region 57a corresponding to the lower incident surface 53, the unevenness amount is set to 5 μm in consideration of the influence on the low beam light distribution pattern, and the light distribution shown in FIG. 8 (b). A halo is added to the pattern, and the high-intensity band seen in FIG. 8 (b) becomes inconspicuous.
On the other hand, as regions corresponding to the upper incident surface 52, the second region 57b on the central side in the horizontal direction, the third region 57c on the right side (outside the vehicle) in the horizontal direction of the second region 57b, and the horizontal region 57b of the second region 57b. The fourth region 57d on the left side of the direction (inside the vehicle) and the third region 57d are set, and the uneven amount of the second region 57b is set to 6 μm, and the amount of light diffusion is larger than that of the light diffusion structure formed on the lower incident surface 53. Is set large.

By increasing the amount of light diffused in the second region 57b, the halo is strongly applied, and the inside of the light distribution pattern of FIG. 8A is widened outward to make the light distribution shape closer to a rectangular shape. At the same time, the amount of light is made uniform.
On the other hand, in the third region 57c and the fourth region 57d located on the outer side in the horizontal direction of the second region 57b, the amount of unevenness is kept at 4 μm and the amount of blurring is small, and the rectangular shape of the light distribution pattern is maintained and the first region is The uniformity of the light distribution can be improved by combining with the halo in the two regions 57b.

FIG. 10 is a diagram showing a light distribution pattern on the screen of the vehicle lighting fixture of the present embodiment, and FIG. 10A is a light distribution pattern formed by the light emitted from the upper emission surface 55. FIG. 10 (b) is a light distribution pattern formed by the light emitted from the lower emission surface 56, and FIG. 10 (c) shows a plurality of light distribution patterns of FIGS. 10 (a) and 10 (b). It is a figure which shows the light distribution pattern formed by the light from a 2nd light emitting chip 42.

As shown in FIG. 10, by providing the first reflecting portion 61 and the light diffusion structure, the light distribution pattern of FIG. 10A is closer to a rectangular shape than that of FIG. 8A. Similarly, The light distribution pattern of FIG. 10 (b) is closer to a rectangular shape than that of FIG. 8 (b).
As can be seen from FIG. 10 (c), the light distribution pattern in which these light distribution patterns are multiplexed is a good one having one high luminous intensity band and a beautiful rectangular shape as a whole. ..

By the way, all the light distribution patterns so far are close to the left side (inside of the vehicle) of the vertical axis (see Y axis) passing through the rear basic focal point O of the lens 50 when viewed from the front side of the vehicle in FIG. Although the light distribution pattern formed by the light from the arranged second light emitting chip 42 has been shown, the influence of the light distribution collapse due to the off-axis aberration is the vertical axis passing through the rear basic focal point O of the lens 50 (see Y-axis). ), It tends to appear in the light distribution pattern formed by the light from the second light emitting chip 42.

Therefore, in FIG. 11, the lens 50 is arranged at a position farthest to the left (inside the vehicle) from the vertical axis (see Y axis) passing through the rear basic focal point O of the lens 50 when viewed from the front side of the vehicle in FIG. The light distribution pattern formed by the light from the second light emitting chip 42 is shown.

As can be seen from FIG. 11, in the present embodiment, the incident surface 51 is formed in the shape as described above to suppress off-axis aberrations, so that the light distribution pattern has a beautiful rectangular shape. Therefore, the light distribution collapse due to off-axis aberration is greatly suppressed.

Although the present invention has been described above based on specific embodiments, the present invention is not limited to the above embodiments.
For example, in the above embodiment, as described with reference to FIG. 4A, the upper incident surface 52 has a radius of curvature Rvc on the point M (see FIG. 4) side of about 150 mm, and tends toward the upper side in the vertical direction. Since the radius of curvature increases continuously and the radius of curvature Rvt on the outer edge side is about 300 mm, the upper incident surface 52 has an average radius of curvature obtained by averaging the radius of curvature from the point M to the outer edge. It was a relatively small gradually changing curved surface.

On the other hand, the lower incident surface 53 has a linear shape from the point M to the lower end Rvb in order to suppress the influence on the low beam light distribution pattern, and the curvature from the point M to the lower end Rvb. The average radius of curvature obtained by averaging the radius (including a perfect straight line from the point M to the lower end Rvb (infinite radius of curvature)) is larger than the average radius of curvature of the upper incident surface 52.

The lower incident surface 53 may have an average radius of curvature that is larger than the average radius of curvature of the upper incident surface 52 and can suppress the influence on the low beam light distribution pattern, and the lower incident surface 53 may have a point M. The radius of curvature may be gradually changed from the lower end portion Rvb toward the lower end portion Rvb.
For example, the lower incident surface 53 has a radius of curvature Rvc on the point M (see FIG. 4) side of the lower incident surface 53 of about 150 mm, and the radius of curvature gradually increases toward the lower side in the vertical direction. It may be a curved surface whose radius of curvature is gradually changed so that the radius of curvature becomes about 1000 mm at the lower end portion Rvb.

Even in this case, as in the above embodiment, since the lower incident surface 53 has a larger average radius of curvature than the upper incident surface 52, the lower incident surface 53 basically passes through the rear basic focal point O (see FIG. 3) of the lens. In the vertical cross section of the optical axis (see Z axis), the upper end UE (see FIG. 4) of the upper incident surface 52 is located in front of the lower end Rvb (see FIG. 4) of the lower incident surface 53. Become.

Then, as described above, by making the lower incident surface 53 a gradually changing curved surface, the influence of off-axis aberrations is further suppressed, and the arrangement is closer to a rectangular shape than the light distribution pattern shown in FIG. It can be an optical pattern.

As described above, the present invention includes those modified or improved without departing from the technical idea within the technical scope of the invention, which is described in the scope of claims by those skilled in the art. It is clear from.

The inventions described in the claims originally attached to the application for the application before priority are added below. The claims in the appendix are as specified in the claims originally attached to the application for the application before priority.
<Claim 1>
The first light emitting chip for low beam light distribution and
Multiple second light emitting chips arranged horizontally for high beam light distribution,
A lens that irradiates the light of the first light emitting chip and the second light emitting chip to the front side,
A reflector that reflects light from the first light emitting chip toward the lens, and
With a shade that blocks a part of the light reflected by the reflector,
The lens is
The upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focus of the lens,
A lower incident surface on the lower side in the vertical direction from the basic optical axis is provided.
The upper incident surface has a shape in which the radius of curvature increases from the basic optical axis side toward the outer edge of the upper incident surface.
The lower incident surface is
A vehicle lighting tool characterized in that the radius of curvature increases from the central side in the horizontal direction to the outside in the horizontal direction and the vertical cross section has a linear shape.
<Claim 2>
The lens is
The upper exit surface on the upper side in the vertical direction from the basic optical axis,
A lower exit surface on the lower side in the vertical direction from the basic optical axis is provided.
The upper emission surface is formed so as to distribute the light radiating from the lens to the front side, the central side in the vertical direction of the lens is distributed to the lower side in the vertical direction, and the upper side in the vertical direction of the lens is distributed to the upper side in the vertical direction. And
The lower exit surface is
The first lower exit surface on the horizontal center side,
It has two second lower exit surfaces located on the horizontal outer side of the first lower exit surface.
The second lower emission surface is toward the outer peripheral edge of the second lower emission surface from the position on the basic optical axis side, and the outer peripheral edge side of the second lower emission surface is closer to the rear basic focal point. The vehicle lamp according to claim 1, wherein the lamp is formed in a shape that irradiates light from the light downward in the vertical direction.
<Claim 3>
The second light emitting chip is arranged on the lower side in the vertical direction on the rear side of the rear basic focal point of the lens.
The second light emitting chip is characterized in that the light emitting surface is arranged so as to be inclined upward in the vertical direction so that the light emitting optical axis passing through the light emitting center intersects the upper incident surface. Vehicle lighting equipment described in.
<Claim 4>
A first reflecting portion that reflects a part of the light radiated from the second light emitting chip toward the lower incident surface upward in the vertical direction.
Any of claims 1 to 3, further comprising a second reflecting portion that reflects a part of the light radiated upward in the vertical direction from the second light emitting chip to the lower side in the vertical direction. The vehicle lighting equipment according to item 1.
<Claim 5>
The amount of light incident on the lower incident surface of the first reflecting portion directly from the second light emitting chip toward the lower incident surface is 1/3 to 2/3. The vehicle lighting fixture according to claim 4, wherein the light is reflected.
<Claim 6>
It has a light diffusion structure formed on the lower incident surface and the upper incident surface to diffuse the light incident on the lens.
Claim 1 is characterized in that the light diffusion structure formed on the horizontal center side of the upper incident surface is set to have a larger amount of light diffusion than the light diffusion structure formed on the lower incident surface. The vehicle lighting equipment according to any one of claims 5.

10 Lighting unit 20 Heat sink 21 Base part 22 Heat dissipation fin 23 First board 24 First light emitting chip 25 First light source 26 Mounting part 27 Holder 30 Reflector 30a Reflector 31 Shade 31a Edge 40 Mounting member 40a First surface 41 Second Board 42 Second light emitting chip 43 Second light source 44 Power supply connector 50 Lens 50a Lens holder 51 Incident surface 52 Upper incident surface 53 Lower incident surface 54 Exit surface 55 Upper exit surface 56 Lower exit surface 56a First lower exit surface 56b , 56c Second lower exit surface (exit surface)
57a 1st area 57b 2nd area 57c 3rd area 57d 4th area 61 1st reflection part 62 2nd reflection part 101L, 101R Vehicle headlight 102 Vehicle BF Basic focus D point F Focal length K distance L Lens M point O Rear basic focus OSC Sine condition violation amount OZ Emission optical axis P Optical axis Q1, Q2, Q3, Q4 Position S1 One surface S2 The other surface SML Main surface SP Principal point θ1, θ2 Angle

Claims (5)

The first light emitting chip for low beam light distribution and
Multiple second light emitting chips arranged horizontally for high beam light distribution,
A lens that irradiates the light of the first light emitting chip and the second light emitting chip to the front side,
A reflector that reflects light from the first light emitting chip toward the lens, and
With a shade that blocks a part of the light reflected by the reflector,
The lens is
The upper incident surface on the upper side in the vertical direction from the basic optical axis passing through the rear basic focus of the lens,
A lower incident surface on the lower side in the vertical direction from the basic optical axis is provided.
The upper incident surface has a shape in which the radius of curvature increases from the basic optical axis side toward the outer edge of the upper incident surface.
The lower incident surface is
As the radius of curvature increases from the center side in the horizontal direction to the outside in the horizontal direction,
A vehicle lamp characterized by having a shape with a straight vertical cross section. The second light emitting chip is arranged on the lower side in the vertical direction on the rear side of the rear basic focal point of the lens.
In the second light emitting chip, the light emitting optical axis passing through the light emitting center intersects the upper incident surface.
The vehicle lighting fixture according to claim 1, wherein the light emitting surface is arranged so as to be inclined upward in the vertical direction. A first reflecting portion that reflects a part of the light radiated from the second light emitting chip toward the lower incident surface upward in the vertical direction.
2. Vehicle lighting. Of the light radiated directly from the second light emitting chip toward the lower incident surface, the amount of light incident on the lower incident surface of the first reflecting unit is 1/3 to 6/7. The vehicle lighting fixture according to claim 3, wherein the light is reflected. It has a light diffusion structure formed on the lower incident surface and the upper incident surface to diffuse the light incident on the lens.
Claim 1 is characterized in that the light diffusion structure formed on the horizontal center side of the upper incident surface is set to have a larger amount of light diffusion than the light diffusion structure formed on the lower incident surface. The vehicle lighting equipment according to any one of claims 4.

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