JP7164164B2 - vehicle lamp - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle lamp, and more particularly to a vehicle lamp using a light guide (for example, a light guide rod) that can be visually recognized as if the outer peripheral surface is emitting light uniformly.

Conventionally, there is known a vehicle lamp using a light guide rod having an outer peripheral surface (side surface) from which light from a light source that has entered from one end surface and the other end surface is emitted (for example, Patent Document 1 (see FIG. 1, etc.) )reference).

European Patent No. 1154198

However, as a result of examination by the present inventors, in the vehicle lamp described in Patent Document 1, it is difficult to uniformly emit the light from the light source, which is incident from one end surface and the other end surface, from the outer peripheral surface. and a low-luminance region are mixed, resulting in luminance unevenness.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and provides a vehicle lamp using a light guide (e.g., a light guide rod) that can be visually recognized as if the outer peripheral surface is emitting light uniformly. for the purpose.

In order to achieve the above object, one aspect of the present invention is to provide a light guide extending in a predetermined direction; a first light source that emits light guided toward the light guide; and a first light source that enters the light guide from the other end surface of the light guide and emits light that is guided toward the one end surface of the light guide. a second light source, wherein the outer peripheral surface of the light guide includes a first surface arranged on the front side and a second surface arranged on the opposite side of the back surface; The surface is a semicircular surface whose cross-section along a plane orthogonal to the predetermined direction is convex toward the front side, and includes a pair of external surfaces that extend in the predetermined direction when viewed from the front and define the external shape of the first surface. wherein the second surface includes a plurality of structures for emitting light from the first light source and light from the second light source guided in the light guide from the first surface ; The pair of external surfaces are flat surfaces, and are arranged at an arbitrary angle within an angle range of greater than 0 degrees and less than or equal to 10 degrees with respect to a reference axis extending in the longitudinal direction of the vehicle, and the first light source. and the light from the second light source is emitted from the first surface including the pair of external surfaces .

According to this aspect, it is possible to provide a vehicle lamp that uses a light guide (for example, a light guide bar) that can be visually recognized as if the outer peripheral surface is emitting light uniformly.

In this method, a pair of outer surfaces extending in a predetermined direction when viewed from the front and defining the outer shape of the first surface are provided, and the pair of outer surfaces emit light relatively brightly, thereby complementing the low luminance region. It is due to becoming

In the above invention, preferably, the first surface includes a first region on one end surface side of the light guide, a second region on the other end surface side of the light guide , the first region and the a third region from which light from the first light source entering from the one end face and light from the second light source entering from the other end face are emitted in a region between the second region; The first area and the second area are configured to diffuse the light from the first light source and the second light source, respectively, in a direction orthogonal to the predetermined direction, and the second surface is configured to diffuse the light from the first light source and the second light source, respectively. It is characterized in that it is configured to diffuse light from the light source and the second light source in the predetermined direction.

Further, in the above invention, in a preferred mode, the first region and the second region each have a plurality of knurls protruding toward the interior of the light guide and extending in the predetermined direction in the circumferential direction of the outer peripheral surface. A plurality of triangular prism-shaped lens cuts extending in a direction perpendicular to the predetermined direction are provided on the second surface in the predetermined direction, and the triangular prism-shaped lens cuts are provided on the guide . It is characterized by including two side surfaces that are convex toward the inside of the light body .

Further, in the above invention, in a preferred aspect, the outer peripheral surface of the light guide further includes a pair of third surfaces connecting the first surface and the second surface, and the first surface extends toward the front side. It is a cylindrical surface that is convex and extends in the predetermined direction, and each of the pair of third surfaces is a curved surface that is convex toward the inside of the light guide .

In the above invention, a preferred aspect is characterized in that the light guide is a light guide rod or a light guide plate.

1 is a perspective view of a vehicle lamp 10; FIG. (a) AA sectional view of the light guide rod 20 shown in FIG. 1, (b) BB sectional view. 4 is a partially enlarged perspective view of the light guide rod 20; FIG. 4 is a partially enlarged perspective view of the light guide rod 20; FIG. 5 is a partially enlarged cross-sectional view of the light guide rod 20 shown in FIG. 4 taken along the XY plane; FIG. 5 is a partially enlarged cross-sectional view of the light guide rod 20 shown in FIG. 4 taken along the XY plane; FIG. It is a figure showing the luminance distribution of the light guide stick 20 seen from the front side. FIG. 4 is a schematic diagram showing optical paths of light in respective cross sections A to E of the light guide rod 20; FIG. 9 shows an example in which a pair of outer surfaces 21c1 and 21c2 (see a pair of outer light emitting areas A3 and A4 drawn with thick lines in FIG. 9) are made to emit light relatively brighter than in FIG. It is sectional drawing of 20 A of light guide rods comprised so that a pair of outer surface 21c1 and 21c2 could light-emit relatively brightly. FIG. 11 is an enlarged view of a range surrounded by a dotted circle in FIG. 10; It is a modification of light guide stick 20A.

A vehicle lamp 10 according to an embodiment of the present invention will be described below with reference to the accompanying drawings. The same reference numerals are given to corresponding components in each figure, and duplicate descriptions are omitted.

FIG. 1 is a perspective view of a vehicle lamp 10. FIG.

A vehicle lamp 10 shown in FIG. 1 is, for example, a high mount stop lamp, and is mounted between the rear end portion of the roof of a vehicle (not shown) and the upper end portion of the back window glass. For convenience of explanation, the XYZ axes are defined below. The X-axis extends in the vehicle front-rear direction, the Y-axis extends in the vehicle width direction, and the Z-axis extends in the vertical direction.

As shown in FIG. 1, the vehicle lamp 10 of this embodiment includes a light guide rod 20, a first light source 30A, a second light source 30B, and the like. Although not shown, the vehicle lamp 10 is arranged in a lamp chamber composed of an outer lens and a housing, and is attached to the housing or the like.

The light guide bar 20 is a long light guide extending generally in the Y-axis direction (corresponding to the predetermined direction of the present invention) and includes a flange portion 25 . The light guide rod 20 is attached to a housing or the like by screwing the flange portion 25 to the housing or the like.

2(a) is a cross-sectional view of the light guide rod 20 shown in FIG. 1 along the line AA, and FIG. 2(b) is a cross-sectional view along the line BB.

As shown in FIGS. 1 and 2, the outer peripheral surface (side surface) of the light guide rod 20 includes a first surface 21 arranged on the front side, a second surface 22 arranged on the opposite side of the back surface, A pair of upper and lower third surfaces 23 a and 23 b connecting the first surface 21 and the second surface 22 are included.

The first surface 21 is a cylindrical surface (see FIG. 1) having a semicircular shape (see FIG. 2) that is convex toward the front side in a cross section along the XZ plane, and having a cylinder axis extending generally in the Y-axis direction.

As shown in FIG. 1, the first surface 21 includes a first region 21a on the side of one end surface 24a of the light guide rod 20, a second region 21b on the side of the other end surface 24b of the light guide rod 20, and a first region 21a. a third region 21c from which the light from the first light source 30A entering from the one end face 24a and the light from the second light source 30B entering from the other end face 24b are emitted in a region between the second region 21b; include. Hereinafter, portions of the light guide rod 20 where the first region 21a and the second region 21b are provided are also referred to as run-up sections L21a and L21b, respectively. A portion of the light guide rod 20 where the third region 21c is provided is also referred to as a designed section L21c.

FIG. 3 is a partially enlarged perspective view of the light guide rod 20. FIG.

The first region 21a is configured to diffuse the light from the first light source 30A incident on the first region 21a in the vertical direction (the Z-axis direction in FIG. 2).

Specifically, as shown in FIG. 3, the first region 21a is convex toward the inside of the light guide rod 20 (for example, the cross section of the XZ plane is an arc with a radius of curvature R1) and extends in the Y-axis direction. A plurality of knurls 21 a 1 (also referred to as knurl cuts or cylindrical surfaces) are provided on the outer peripheral surface of the light guide rod 20 in the circumferential direction. As shown in FIG. 2(a), the light from the first light source 30A entering from the one end surface 24a of the light guide rod 20 is internally reflected by the plurality of knurls 21a1, and is mainly reflected in the vertical direction ( Z-axis direction in FIG. 2). In addition, between the plurality of knurls 21a1 (also referred to as knurl cuts or cylindrical surfaces), there is a recess toward the inside of the light guide rod 20 (for example, a cross section on the XZ plane is an arc with a curvature radius R2) and extends in the Y-axis direction. A plurality of curved surfaces 21a2 are provided. The curved surface 21a2 can suppress the formation of valleys (edges) between the knurls 21a1 and the leakage of light from the valleys (edges).

Similarly, the second region 21b is configured to diffuse the light from the second light source 30B incident on the second region 21b in the vertical direction (the Z-axis direction in FIG. 2).

Specifically, although not shown, in the second region 21b, a plurality of knurls extending in the Y-axis direction are projected toward the inside of the light guide rod 20 (for example, a cross section by the XZ plane is an arc with a curvature radius R1) 21b1 (also referred to as a knurled cut or a cylindrical surface) is provided on the outer peripheral surface of the light guide rod 20 in the circumferential direction. Light from the second light source 30B entering from the other end surface 24b of the light guide rod 20 is internally reflected by the plurality of knurls 21b1, and is diffused mainly in the vertical direction (the Z-axis direction in FIG. 2). be. Further, although not shown, between a plurality of knurls 21b1 (also referred to as knurl cuts or cylindrical surfaces), there is a concave toward the inside of the light guide rod 20 (for example, a cross section by the XZ plane is an arc with a curvature radius R2), and a Y A plurality of curved surfaces 21b2 extending in the axial direction are provided. The curved surface 21b2 can suppress the formation of valleys (edges) between the knurls 21b1 and the leakage of light from the valleys (edges).

The second surface 22 is a plane parallel to the ZY plane.

FIG. 4 is a partially enlarged perspective view of the light guide rod 20. FIG.

The second surface 22 is configured to diffuse the light from the first light source 30A and the second light source 30B incident on the second surface 22 in the horizontal direction (the Y-axis direction in FIG. 6). Specifically, the second surface 22 is configured as follows.

As shown in FIG. 4, the second surface 22 includes a plurality of light guides for emitting the light from the first light source 30A and the light from the second light source 30B guided in the light guide rod 20 from the third region 21c. Including structures. Specifically, the second surface 22 is provided with a plurality of triangular prism-shaped lens cuts 22a extending in the Z-axis direction and having a substantially isosceles triangular cross-sectional shape on the XY plane in the Y-axis direction.

FIG. 5 is a partially enlarged cross-sectional view of the light guide rod 20 shown in FIG. 4 along the XY plane.

As shown in FIG. 5, each triangular prism-shaped lens cut 22a is convex toward the inside of the light guide rod 20 (for example, the cross section on the XY plane is an arc with a curvature radius R3) and extends in the Z-axis direction. It includes sides 22a1 and 22a2.

The light from the first light source 30A entering from one end surface 24a of the light guide rod 20 (and the light from the second light source 30B entering from the other end surface 24b) is cut into each triangular prism-shaped lens cut 22a (two side surfaces 22a1, 22a2), the light is diffused mainly in the horizontal direction (the Y-axis direction in FIG. 6). FIG. 6 is a partially enlarged cross-sectional view of the light guide rod 20 shown in FIG. 4 along the XY plane. Light from the second light source 30B entering from the end face 24b) is diffused in the horizontal direction (the Y-axis direction in FIG. 6).

As shown in FIG. 2, the pair of upper and lower third surfaces 23a and 23b are curved surfaces extending in the Y-axis direction, each of which has a cross section along the XZ plane that is convex toward the inside of the light guide rod 20 . As a result, the pair of upper and lower third surfaces 23a and 23b are concave toward the inside of the light guide rod 20 (see the dashed line in FIG. 2(b)) in cross section along the XZ plane, and extend in the Y-axis direction. Compared to the curved surface, the light emitted from the first surface 21 (the design section L21c, that is, the third area 21c) by being internally reflected by the second surface 22 (a plurality of triangular prism-shaped lens cuts 22a) increases.

One end surface 24a and the other end surface 24b of the light guide rod 20 are planes parallel to the XZ plane, for example.

The first light source 30A is, for example, a red LED (when the vehicle lamp 10 is used as a tail lamp), and is fixed to a housing or the like with its light emitting surface (not shown) facing the one end surface 24a of the light guide rod 20. be done. The first light source 30A emits light that enters the light guide rod 20 from one end surface 24a of the light guide rod 20 and is guided toward the other end surface 24b of the light guide rod 20 . Note that the optical axis of the first light source 30A extends in the Y-axis direction.

The second light source 30B is, for example, a red LED (when the vehicle lamp 10 is used as a tail lamp), and is fixed to a housing or the like with its light emitting surface (not shown) facing the other end surface 24b of the light guide rod 20. be done. The second light source 30B emits light that enters the light guide rod 20 from the other end surface 24b of the light guide rod 20 and is guided toward the one end surface 24a of the light guide rod 20 . Note that the optical axis of the second light source 30B extends in the Y-axis direction.

In the vehicle lamp 10 configured as described above, the light from the first light source 30A that enters from the one end surface 24a of the light guide rod 20 (and the light from the second light source 30B that enters from the other end surface 24b of the light guide rod 20) ) is internally reflected by the first surface 21, the second surface 22, and the pair of upper and lower third surfaces 23a and 23b, so that the other end surface 24b of the light guide rod 20 (and the one end surface 24a of the light guide rod 20 ), the light is internally reflected by a plurality of knurls 21a1 provided on the first surface 21 (approach sections L21a and L21b, i.e., the first region 21a and the second region 21b) and is reflected in the vertical direction (Fig. 2 Z-axis direction) and is internally reflected by a plurality of triangular prism-shaped lens cuts 22a provided on the second surface 22 (two side surfaces 22a1 and 22a2 convex toward the inside of the light guide rod 20). A part of the light from the first light source 30A (and the light from the second light source 30B) diffused in the vertical direction and the horizontal direction in this way (and the light from the second light source 30B) is part of the light guide rod 20 is emitted from the first surface 21 (the design section L21c, that is, the third region 21c).

FIG. 7 is a diagram showing the luminance distribution of the light guide rod 20 viewed from the front side. In FIG. 7, a black area A1 indicates a relatively high luminance area (hereinafter referred to as a high luminance area A1), and a white area A2 indicates a relatively low luminance area (hereinafter referred to as a low luminance area A2 ). The maximum width L1 in the Z-axis direction of the low luminance area A2 is approximately 2 mm. Incidentally, the diameter L2 of the light guide rod 20 is approximately 7 mm.

As a result of examination by the present inventors, in the light guide rod 20 having the above configuration, as shown in FIG. , the first surface 21 (the third region 21c) cannot be visually recognized as emitting light uniformly.

FIG. 8 is a schematic diagram showing optical paths of light in each cross section A to E of the light guide rod 20. As shown in FIG.

The reason why luminance unevenness occurs is, for example, as shown in FIG. This is because light with a relatively high intensity (for example, light within the half-value angle) among the light (same as above) is internally reflected within the light guide rod 20 and emitted in different directions for each cross section.

For example, in FIG. 8, in a cross section between the aa cross section and the bb cross section (eg, cross section A), the light from the second light source 30B entering the light guide rod 20 is relatively Light with high intensity is mainly emitted in the front direction. In addition, in FIG. 8, between the bb section and the cc section (for example, section B), the relative intensity of the light from the second light source 30B entering the light guide rod 20 Light with a high λ is emitted mainly in a downward direction with respect to the front direction. The same applies to other sections C to E and the like.

As described above, among the light from the second light source 30B that has entered the light guide rod 20 (the light from the first light source 30A that has entered the light guide rod 20 is the same), the light with relatively high intensity ( For example, light within a half-value angle) is internally reflected within the light guide rod 20 and emitted in different directions for each cross section. As a result, as shown in FIG. brightness unevenness occurs.

As a result of intensive studies aimed at improving the luminance unevenness, the present inventors provided a pair of outer surfaces 21c1 and 21c2 that define the outer shape of the first surface 21 (third region 21c), as shown in FIG. When the pair of outer surfaces 21c1 and 21c2 are made to emit light relatively brightly (see the pair of outer shape light emitting areas A3 and A4 drawn with thick lines in FIG. 9), the low luminance area A2 is complemented, and the first surface 21 It was found that the (third region 21c) can be visually recognized as if it were emitting light uniformly. FIG. 9 shows an example in which a pair of outer surfaces 21c1 and 21c2 (see a pair of outer light emitting areas A3 and A4 drawn with thick lines in FIG. 9) are made to emit light relatively brighter than in FIG. Hereinafter, the light guide rod 20 provided with the pair of outer surfaces 21c1 and 21c2 will be referred to as a light guide rod 20A.

A configuration example for causing the pair of outer surfaces 21c1 and 21c2 to emit relatively bright light will be described below.

FIG. 10 is a cross-sectional view of a light guide rod 20A configured to make a pair of outer surfaces 21c1 and 21c2 emit relatively bright light.

A light guide rod 20A shown in FIG. 10 differs from the light guide rod 20 shown in FIG. 2B in that the first surface 21 (third region 21c) includes a pair of outer surfaces 21c1 and 21c2. Otherwise, it is the same as the light guide bar 20 shown in FIG. 2(b). Hereinafter, the light guide rod 20A shown in FIG. 10 will be described with a focus on the differences.

The pair of outer surfaces 21c1 and 21c2 respectively extend generally in the Y-axis direction (the direction perpendicular to the plane of FIG. 10) when viewed from the front and define the outer shape of the first surface 21 (third region 21c).

As shown in FIG. 10, one outer surface 21c1 is arranged on one end side (a range of width L3 in FIG. 10) of the first surface 21 (third region 21c) in the XZ plane cross section. The width L3 of one outer surface 21c1 is, for example, 0.2 mm. One outer surface 21c1 is a flat surface or a flat surface (hereinafter referred to as a flat surface), and is arranged at an angle θ1 with respect to a reference axis AX extending in the longitudinal direction of the vehicle. The angle θ1 is, for example, an arbitrary angle within an angle range greater than 0 degrees and 10 degrees or less.

The other outer surface 21c2 is arranged on the other end side (width L4 range in FIG. 10) of the first surface 21 (third region 21c) in the cross section along the XZ plane. The width L4 of the other outer surface 21c2 is, for example, 0.2 mm. The other outer surface 21c2 is a flat surface and is arranged in a state inclined at an angle θ2 with respect to the reference axis AX. The angle θ2 is, for example, an arbitrary angle within an angle range greater than 0 degrees and 10 degrees or less. Note that the angle θ1 and the angle θ2 may be the same or different.

FIG. 11 is an enlarged view of the area surrounded by the dotted line circle in FIG.

In the vehicle lamp 10 configured as described above, the other end surface of the light guide rod 20A is internally reflected by the first surface 21, the second surface 22, and the pair of upper and lower third surfaces 23a and 23b. A part of the light from the first light source 30A (and the light from the second light source 30B) guided toward 24b (and one end surface 24a of the light guide rod 20) is the first surface 21 of the light guide rod 20A. It is emitted from (the design section L _21c , that is, the third region 21c).

At that time, since the pair of outer surfaces 21c1 and 21c2 are flat surfaces, the light from the first light source 30A entering from the one end surface 24a of the light guide rod 20A is internally reflected by the pair of outer surfaces 21c1 and 21c2. This allows the light to be guided farther. The same applies to the light from the second light source 30B entering from the other end surface 24b of the light guide rod 20A.

Among the light from the first light source 30A (and the light from the second light source 30B) guided in the light guide rod 20A as described above, mainly the second surface 22 (a plurality of triangular prism-shaped lens cuts 22a ) is refracted from the first surface 21 (third region 21c) and emitted from the first surface 21 (third region 21c). is formed.

In addition, among the light from the first light source 30A (and the second light source 30B) guided in the light guide rod 20A, mainly the light Ray1b internally reflected by the third surface 23a (see FIGS. 10 and 11) ) is refracted and emitted from one outer surface 21c1 to form one outer light emitting area A3 that is relatively bright (high luminance) extending substantially in the Y-axis direction, as shown in FIG. The width L5 (see FIGS. 9 and 10) of one outer shape light emitting region A3 can be adjusted by adjusting the angle θ1 of one outer shape surface 21c1 with respect to the reference axis AX.

Similarly, among the light from the first light source 30A (and the second light source 30B) guided in the light guide rod 20A, the light Ray1c (see FIG. 10) internally reflected by the third surface 23b is mainly By emitting from the other outer surface 21c2, as shown in FIG. 9, the other outer shape light-emitting area A4 that is relatively bright (has high brightness) and extends substantially in the Y-axis direction is formed. The width L6 (see FIGS. 9 and 10) of the other outer shape light emitting region A4 can be adjusted by adjusting the angle θ2 of the other outer shape surface 21c2 with respect to the reference axis AX.

The brightness (luminance) emitted by the pair of external surfaces 21c1 and 21c2 can be adjusted, for example, by adjusting the shape (for example, curvature) of the pair of upper and lower third surfaces 23a and 23b. For example, using predetermined simulation software, the shape (e.g., curvature) of the pair of upper and lower third surfaces 23a and 23b is changed (adjusted). A condition that allows the first surface 21 (third region 21c), which is the outer peripheral surface, to be visually recognized as uniformly emitting light by checking whether the region 21c) appears to emit light uniformly. (For example, the shape (eg, curvature) of the pair of upper and lower third surfaces 23a and 23b) can be found.

As described above, according to the present embodiment, the first surface 21 (the third region 21c), which is the outer peripheral surface, can be visually recognized as if it is emitting light uniformly. A lamp 10 can be provided.

A pair of outer surfaces 21c1 and 21c2 extending in the Y-axis direction in a front view and defining the outer shape of the first surface 21 (third region 21c) are provided, and the pair of outer surfaces 21c1 and 21c2 are relatively bright. This is because the low-luminance area A2 is complemented by the light emission.

Next, a modified example will be described.

In the above embodiment, an example in which the vehicle lamp of the present invention is applied to a high mount stop lamp has been described, but the present invention is not limited to this. For example, the vehicle lighting device of the present invention may be applied to general automobile lighting devices such as head lamps, lid lamps (lamps attached to movable parts such as back doors and trunks), interior lights, and the like.

Further, in the above-described embodiment, as shown in FIG. 10, an example in which the vehicle lamp of the present invention is applied to the vehicle lamp 10 using the light guide rod 20A having a ginkgo-shaped cross section has been described, but the present invention is not limited to this. . For example, as shown in FIG. 12, the vehicle lamp of the present invention may be applied to a vehicle lamp using a general light guide rod having a circular cross section. FIG. 12 is a modification of the light guide rod 20A.

Further, in the above-described embodiment, as shown in FIG. 10, an example in which the vehicle lamp of the present invention is applied to the vehicle lamp 10 using the light guide rod 20A has been described, but the present invention is not limited to this. For example, although not shown, the vehicle lamp of the present invention may be applied to a vehicle lamp using a light guide such as a light guide plate.

Also, in the above-described embodiment, an example in which the first region 21a and the second region 21b are provided has been described, but the present invention is not limited to this. For example, the first area 21a and the second area 21b may be omitted. For example, the present invention may be applied to the above conventional light guide bar in which the first region 21a and the second region 21b are omitted, and other light guide bars.

Further, in the above-described embodiment, as the lens cut of the second surface 22, two side surfaces extending in the Z-axis direction are convex toward the inside of the light guide rod 20A (for example, the cross section by the XY plane is an arc with a curvature radius R3) Although the example using the triangular prism-shaped lens cut 22a including 22a1 and 22a2 has been described, the present invention is not limited to this. That is, the lens cut of the second surface 22 has a plurality of structures for emitting the light from the first light source 30A and the light from the second light source 30B guided in the light guide rod 20A from the third region 21c. For example, a general lens cut used in the conventional light guide bar and other light guide bars may be used.

All of the numerical values shown in the above embodiments are examples, and it is of course possible to use other appropriate numerical values.

Each above-mentioned embodiment is only a mere illustration in all respects. The present invention is not limitedly interpreted by the description of each of the above embodiments. The invention can be embodied in various other forms without departing from its spirit or essential characteristics.

Reference Signs List 10 Vehicle lamp 20, 20A, 20B Light guide bar 21 First surface 21a First region 21a1 Knurled surface 21a2 Curved surface 21b Second region 21b1 Knurled 21b2 Curved surface 21c... third area 21c1, 21c2... pair of external surfaces 22... second surface 22a... lens cut 22a1, 22a2... side surface 23a, 23b... third surface 24a... one end surface 24b... other end surface, 30A... First light source, 30B... Second light source

Claims (4)

a light guide extending in a predetermined direction;
a first light source that emits light that enters the light guide from one end surface of the light guide and is guided toward the other end surface of the light guide;
a second light source that emits light that enters the light guide from the other end surface of the light guide and is guided toward one end surface of the light guide;
The outer peripheral surface of the light guide includes a first surface arranged on the front side and a second surface arranged on the opposite side of the back surface,
The first surface is a pair of semicircular surfaces whose cross section along a plane perpendicular to the predetermined direction is convex toward the front side and extends in the predetermined direction when viewed from the front to define the outer shape of the first surface. including the profile surface,
the second surface includes a plurality of structures for emitting light from the first light source and light from the second light source guided in the light guide from the first surface ;
each of the pair of outer contour surfaces is a flat surface, and is arranged in a state inclined at an arbitrary angle within an angle range of greater than 0 degrees and less than or equal to 10 degrees with respect to a reference axis extending in the longitudinal direction of the vehicle;
A vehicle lamp in which light from the first light source and the second light source is emitted from the first surface including the pair of outer surfaces . The first surface comprises a first region on one end face side of the light guide, a second region on the other end face side of the light guide , and a region between the first region and the second region, a third region from which light from the first light source entering from the one end surface and light from the second light source entering from the other end surface are emitted;
The first region and the second region are configured to diffuse the light from the first light source and the second light source, respectively, in a direction orthogonal to the predetermined direction,
2. The vehicle lamp according to claim 1 , wherein the second surface is configured to diffuse light from the first light source and the second light source in the predetermined direction. In the first region and the second region, a plurality of knurls that protrude toward the inside of the light guide and extend in the predetermined direction are provided in the circumferential direction of the outer peripheral surface,
A plurality of triangular prism-shaped lens cuts extending in a direction orthogonal to the predetermined direction are provided on the second surface in the predetermined direction,
3. The vehicle lamp according to claim 2 , wherein the triangular prism-shaped lens cut includes two side surfaces convex toward the interior of the light guide . the outer peripheral surface of the light guide further includes a pair of third surfaces connecting the first surface and the second surface;
The first surface is a cylindrical surface that protrudes toward the front side and extends in the predetermined direction,
4. The vehicular lamp according to claim 2 , wherein the pair of third surfaces are curved surfaces convex toward the interior of the light guide .

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