JP2012022943A - Lamp unit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp unit capable of emitting light in a clear line shape.SOLUTION: The lamp unit 1 includes a light source 10 having an optical axis Ax headed forward, and a light guide body 20 arranged in front of the light source 10 so as to extend in a lateral direction. The light guide body 20 has a first incident section 21 projected at a rear face, emitting surfaces 24 formed in an elongated shape on a front face in the lateral direction, a first reflecting surface 231 for internally reflecting light from the first incident section 21 from the front face to the rear face, a plurality of second reflecting surfaces 232 arranged in parallel with the first incident section 21 in the lateral direction and internally reflecting light from the first reflecting surface 231 to respective corresponding first emitting sections 24a of the emitting surfaces 24, and second incident sections 22 formed between the neighboring second reflecting surfaces 232 and making the light advancing further sideways than the first incident section 21 among the light from the light source 10 incident to the light guide body 20 while advancing to second emitting sections 24b between the neighboring first emitting sections 24a among the emitting surfaces 24.

Description

  The present invention relates to a lamp unit.

  2. Description of the Related Art Conventionally, as a lamp unit used for a vehicle signal lamp, a decorative lamp, or the like, a unit that emits light in a line shape forward as described in Patent Document 1, for example, is known.

As shown in FIG. 6, the lamp unit 900 described in Patent Document 1 includes a light source 901 such as an LED, and a light guide body 902 that is long in the left and right positions disposed in front of the light source 901. The light guide 902 is formed with a pair of left and right first reflecting surfaces 902a and 902a having a paraboloidal shape focusing on the light source 901 at the center of the front surface, and a light emitting surface 902b elongated to the left and right is a first reflecting surface. Are formed on both sides of the surfaces 902a, 902a, and a plurality of second reflecting surfaces 902c,... Are intermittently formed on the surface opposite to the exit surface 902b.
With such a configuration, in the lamp unit 900, light emitted from the light source 901 and incident into the light guide 902 is reflected left and right by the pair of first reflection surfaces 902a and 902a, and a plurality of second reflection surfaces 902c. ,... Are reflected forward and diffused and emitted from the emission surface 902b, so that the emission surface 902b emits light in a line shape.

Japanese Patent No. 4290601

However, in the lamp unit 900 described above, since the light is not actively reflected from the gap portion 902d between the adjacent second reflecting surfaces 902c toward the emitting surface 902b, the emitting surface 902b is viewed from the front (front). Sometimes, the portion located in front of the gap portion 902d was darker (dark portion) than the portion located in front of the second reflecting surface 902c. That is, in the lamp unit 900, luminance unevenness occurs in the light emission of the emission surface 902b, and the emission surface 902b does not emit light in a clear line shape.
In the lamp unit 900, a plurality of V-shaped grooves are provided in the gap portion 902d so that stray light in the light guide 902 can be reflected. However, the portion corresponding to the gap portion 902d is based on this. However, the above-described luminance unevenness cannot be solved.

  The subject of this invention is providing the lamp unit which light-emits in a clear line shape compared with the past.

In order to solve the above problem, the invention according to claim 1 is a lamp unit,
A light source having an optical axis facing forward, and a light guide disposed in front of the light source so as to extend in a direction perpendicular to the optical axis perpendicular to the optical axis,
The light guide is
A first incident portion projecting on one surface of the light source facing the light source;
A plurality of first emission portions arranged along the direction perpendicular to the optical axis, and a second emission portion formed between the adjacent first emission portions, and the other side opposite to the one surface An exit surface formed in a long direction in the direction perpendicular to the optical axis on the surface of
A first reflecting surface formed on the other surface and internally reflecting light incident on the light guide from the first incident portion toward the one surface;
A plurality of lights formed on the one surface so as to be aligned with the first incident portion along the direction orthogonal to the optical axis and internally reflected by the first reflecting surface correspond to the first emitting surface corresponding to the first emitting surface. A second reflecting surface for internal reflection individually toward the part;
Of the light emitted from the light source, the light that is formed between the second reflecting surfaces adjacent to each other and that travels to the side of the first incident portion is the second of the exit surfaces. A second incident part that is incident on the light guide while facing the emission part;
It is characterized by having.

The invention according to claim 2 is the lamp unit according to claim 1,
The first incident portion has a first incident surface formed in a convex shape facing the light source, and the light emitted from the light source is directed to the optical axis direction along the optical axis by the first incident surface. Incident into the light guide while refracting,
The first reflecting surface is positioned in the optical axis direction of the first incident portion, and the other surface is inclined individually to both sides of the optical axis orthogonal direction at an angle of 45 degrees with respect to the optical axis. Are recessed with a pair,
The second reflection surface is disposed on both sides of the first reflection surface in the direction perpendicular to the optical axis, and the first emission portion is disposed so as to be positioned in the optical axis direction of the second reflection surface, Each of the pair of first reflecting surfaces is formed in parallel with the nearby first reflecting surface.

The invention according to claim 3 is the lamp unit according to claim 1 or 2,
The second incident part is:
The second exit portion is disposed so as to be positioned in the optical axis direction of the second entrance portion, and
A second incident surface for allowing light emitted from the light source to enter the light guide, and a second incident surface for internally reflecting light incident from the second incident surface into the light guide in the optical axis direction along the optical axis. 3 reflective surfaces.

The invention according to claim 4 is the lamp unit according to any one of claims 1 to 3,
The light guide is formed symmetrically with respect to the optical axis orthogonal direction about the optical axis.

According to the present invention, after the light emitted from the light source and entering the light guide from the first incident portion is internally reflected by the first reflecting surface and further internally reflected by the plurality of second reflecting surfaces. The light exits forward from a plurality of first exit portions individually corresponding to the plurality of second reflection surfaces of the exit surface. Further, the light emitted from the light source and directed to the side of the first incident portion is incident on the light guide from the second incident portion, and the second incident portion emits the second emission on the emission surface. After being directed to the portion, the light is emitted forward from the second emission portion. In this way, the exit surface that is long in the direction perpendicular to the optical axis emits light in a line shape.
As described above, the second emission part is positively emitted by the second incident part between the plurality of first emission parts from which the light from the second reflecting surface is emitted, so that the second emission part becomes the dark part. Compared to the conventional lamp unit that has been formed, the luminance unevenness of the exit surface can be reduced, and the exit surface can emit light in a clear line shape.

It is a front view of the lamp unit in an embodiment. It is sectional drawing in the II-II line of FIG. It is a figure for demonstrating the optical path in a lamp unit. It is a figure for demonstrating the lamp unit in the modification of embodiment. It is sectional drawing of the lamp unit in the other modification of embodiment. It is a figure for demonstrating the conventional lamp unit.

  Embodiments of the present invention will be described below with reference to the drawings. However, the scope of the invention is not limited to the following embodiments and illustrated examples.

<Configuration of lamp unit>
FIG. 1 is a front view of a lamp unit 1 in the present embodiment, and FIG. 2 is a cross-sectional view taken along line II-II in FIG.
As shown in these drawings, the lamp unit 1 includes a light source 10 and a light guide 20 disposed in front of the light source 10, and is accommodated in a lamp chamber including a housing and a translucent cover (not shown). ing.

  The light source 10 is a light emitter such as a light emitting diode, and is mounted on a substrate (not shown). The light source 10 has an optical axis Ax facing forward, and irradiates light substantially radially forward about the optical axis Ax. The light emitted radially from the light source 10 exhibits a Lambertian light distribution, and is emitted to an angle exceeding 60 ° with respect to the optical axis Ax. The light source 10 is a light source that has a light intensity of 0.5 in an angle range of 40 ° or more with respect to the optical axis Ax when the light intensity of the optical axis Ax is 1.

The light guide 20 is for emitting light emitted from the light source 10 in a line shape. The light guide 20 is formed in a long shape so as to extend in the left-right direction orthogonal to the optical axis Ax. In the present embodiment, the light guide 20 is formed symmetrically about the optical axis Ax.
Specifically, the light guide 20 includes a first incident portion 21 and a second incident portion 22 that allow light emitted from the light source 10 to enter the light guide 20, and light from the light guide 20. An output surface 24 that emits light and a light guide unit 23 that guides light from the first incident unit 21 to the output surface 24 are provided.

Among these, the 1st incident part 21 is protrudingly provided by the rear surface (surface by the side of the light source 10) of the light guide 20 so that the light source 10 may be opposed. A convex (aspherical) first incident surface 211 bulging rearward is formed at the rear end of the first incident portion 21 so as to face the light source 10 with the optical axis Ax as a rotational symmetry axis. . The first incident surface 211 is arranged so that the light source 10 is located at the focal point thereof, and refracts light emitted from the light source 10 in a direction along the optical axis Ax (hereinafter referred to as an optical axis Ax direction). The light is incident into the light guide 20.
Specifically, the light emitted from the light emission center of the light source 10 reaches the first incident surface 211 through the atmosphere and is refracted according to the difference in refractive index between the two. Then, a convex refracting surface composed of a continuous curved surface is designed so that the refracted light goes straight in a direction parallel to the optical axis Ax passing through the emission center. That is, such a continuous curved surface specifies the refractive index of the light guide 20, the position of the light emission center, and the position of the first incident surface 211, and calculates the tangent angle refracted in the optical axis Ax direction at the specific point by simulation. Then, it is determined as a free-form surface continuously connecting those tangents. A convex shape bulging backward obtained by rotating the free-form surface about the optical axis Ax is defined as a first incident surface 211. Further, the tangent at the intersection of the first incident surface 211 and the optical axis Ax is set to 90 ° so as to go straight.
For example, when the light guide 20 is formed of an acrylic resin having a refractive index of 1.47, light emitted at an angle of 10 ° with respect to the optical axis Ax has an incident angle when entering the first incident surface 211. If the angle is 70 ° with respect to the tangent to the incident surface, the refracted light is in the direction of the optical axis Ax.

The light guide unit 23 has a pair of left and right first reflecting surfaces 231 and 231 formed on the front surface of the light guide 20 and a plurality of second reflecting surfaces 232 formed on the rear surface of the light guide 20. is doing.
Among these, the pair of first reflecting surfaces 231 and 231 are recessed in the front surface of the light guide 20 so as to be positioned in the optical axis Ax direction of the first incident portion 21. Specifically, the pair of first reflecting surfaces 231 and 231 are formed in a square shape with a point on the optical axis Ax as a bending point in a side view, and at an angle of 45 degrees with respect to the optical axis Ax. The inclined plane is inclined separately in the left direction and the right direction. The pair of first reflection surfaces 231 and 231 transmits light that enters the light guide 20 from the first incident surface 211 and travels in the direction of the optical axis Ax to the second reflection surfaces 232 and 232 on the rear surface of the light guide 20. Are internally reflected while branching leftward and rightward with the optical axis Ax as a boundary. That is, the light emitted from the light emission center of the light source 10 is refracted by the first incident surface 211 and then travels straight in the direction parallel to the optical axis Ax, and the refracted light is reflected by the first reflecting surface 231. By being reflected, the light beam 20 becomes a parallel light beam in an optical path directed leftward or rightward in the light guide 20.
On the other hand, a plurality of (three in this embodiment) second reflective surfaces 232,... Are formed on the left and right side portions of the rear surface of the light guide 20 so as to be aligned with the first incident portion 21 along the left-right direction. Yes. The second reflecting surfaces 232,... Are stepped forward as they move away from the optical axis Ax while the second reflecting surfaces 232 are alternately connected to the second incident portion 22 in the left-right direction on both the left and right sides. It arrange | positions so that it may be located in. Further, the second reflecting surfaces 232,... Extend uniformly in the thickness direction of the light guide 20 (vertical direction in FIG. 1) and are closer to either of the pair of first reflecting surfaces 231, 231. The first reflecting surface 231 is formed in parallel. That is, each of the second reflecting surfaces 232,... Is an inclined plane that is individually inclined leftward or rightward at an angle of 45 ° with respect to the optical axis Ax. The second reflecting surfaces 232,... Are located on both sides of the first reflecting surfaces 231 and 231 in the left-right direction, and are internally reflected while being branched left and right by the first reflecting surfaces 231 and 231. Are individually internally reflected in the direction of the optical axis Ax, and directed toward a later-described first emission portion 24a of the emission surface 24. The second reflecting surfaces 232,... Are preferably provided at regular intervals in stripes in the vertical direction (front-rear direction) in FIG. By providing the second reflecting surfaces 232,... At equal intervals, the uniformity of brightness on the line-shaped light emitting surface (exit surface 24) is enhanced, and the light emitting surface direction (left and right direction) felt when observing the appearance is increased. A sense of unity can be obtained.

The second incident portions 22 are respectively formed between adjacent second reflecting surfaces 232 on the rear surface of the light guide 20, extend uniformly in the thickness direction of the light guide 20, and are substantially triangular in a side view. It is erected rearward so as to form a shape.
The surface on the side closer to the optical axis Ax of the second incident part 22 allows the light emitted from the light source 10 to enter the light guide body 20 toward the left and right sides of the first incident part 21. The two incident surfaces 221 are configured. The second incident surface 221 is erected substantially vertically downward, and more specifically, is slightly inclined to the left and right sides as a draft from the mold when the light guide 20 is molded. On the other hand, the surface farther from the optical axis Ax in the second incident portion 22 constitutes a third reflecting surface 222 that internally reflects light incident from the second incident surface 221 into the light guide 20 in the direction of the optical axis Ax. is doing.
The second incident portion 22 guides the light emitted from the light source 10 toward the side of the first incident portion 21 toward the second emission portion 24b (described later) of the emission surface 24 while guiding the light. 20 is incident.

Further, the position where the second incident portion 22 is provided is the left side or the right side of the first incident portion 21 and is located adjacent to the second reflecting surface 232. Accordingly, the second incident portion 22 has a function of causing light emitted from the light source 10 and directed to the left or right side of the first incident portion 21 to enter the light guide 20. As described above, the first incident portion 21 uses the light emitted from the light source 10 as light traveling in the direction of the optical axis Ax by the refracting action of the first incident surface 211. Accordingly, among the light emitted from the light source 10, the light traveling in the lateral direction, in other words, the light traveling in the 90 ° direction with respect to the optical axis Ax exceeds the critical angle and cannot be used. . Even when the critical angle is not exceeded, the reflection component at the interface of the incident surface is increased as compared with the incident light component, which is not preferable because the light use efficiency is lowered.
Therefore, for example, when the light guide 20 is formed of an acrylic resin having a refractive index of 1.47, the reflection component relatively increases when it exceeds 30 ° with respect to the optical axis Ax, and therefore does not exceed 30 °. The 1st incident part 21 is provided in the range, and the 2nd incident part 22 is provided in the left side and right side which exceed 30 degrees. As the light source 10, the aforementioned Lambertian light distribution LED light source is used. Therefore, the light intensity of the light source 10 that irradiates the first incident portion 21 inside 30 ° is strong light that is 50% or more of the light intensity of the optical axis Ax, and this strong light enters the light guide 20. Use.

Among the plurality of second incident portions 22,... Adjacent to the first incident portion 21, the tip closest to the light source 10 (rear side) is behind the frontmost side of the first incident surface 211. Located in. As a result, light emitted from the light source 10 and exceeding 30 ° with respect to the optical axis Ax, that is, light having a relative light intensity exceeding 50% can be introduced into the light guide 20, and the first incident surface A part of the light reflected by 211 can also be introduced into the light guide 20.
Furthermore, as described above, a plurality of the second reflecting surfaces 232 are provided on the left side and the right side as planes extending uniformly in the thickness direction of the light guide 20. Therefore, it is preferable that the second incident portion 22 is also provided so as to extend uniformly in the thickness direction of the light guide 20 similarly to the second reflecting surface 232.

  In the present embodiment, the second incident portion 22 is not provided on the front side and the rear side of the optical axis Ax. This is because a free-form surface having a cross-sectional shape appearing in a cross section in the left-right direction of the first incident surface 211 on which light in a range of 30 ° with respect to the optical axis Ax is incident, This is because the size and the thickness direction of the light guide 20 (the vertical direction in the drawing in FIG. 1) are the same, and line-like light emission having a narrow dimension in the thickness direction is obtained.

By the way, the actual light source 10 is not a point light source having the size of the light emission center, but a light source similar to a point light source having a size smaller than that of the first reflecting surface 231. Therefore, not only the optical path shown in FIG. 3 but also an optical path deviating from this optical path, specifically, an irradiation light from the light source 10 emitted from a position adjacent to the light emission center. Although these light beams are reflected by the first reflecting surfaces 231 and 231, a part of the light passes through the first reflecting surface and travels forward. In this way, it is possible to generate a light component that passes through the first reflecting surface 231 by using the light source 10 that emits light not from a perfect point light source but from a point other than on the optical axis Ax. It is suitable for obtaining the light emission of the shape.
In addition, it is preferable to form an internal reflection surface using Snell's law without forming a reflection layer such as an aluminum vapor deposition film on either the first reflection surface 231 or the second reflection surface 232. This is because when the reflective layer is formed, the reflective layer is viewed during non-lighting, and the transparency of the entire lamp is impaired.

The emission surface 24 is disposed on both the left and right sides of the front surface of the light guide 20 with the first reflection surfaces 231 and 231 interposed therebetween, and is formed on a flat surface that is long in the left-right direction. The emission surface 24 includes a plurality of first emission portions 24a arranged in the left-right direction and a plurality of second emission portions 24b formed between adjacent first emission portions 24a. Among these, the 1st output part 24a is arrange | positioned so as to be located in the optical axis Ax direction of the said 2nd reflective surface 232, ... corresponding to the 2nd reflective surface 232, respectively. On the other hand, the second emission portion 24b is disposed so as to be positioned in the optical axis Ax direction of the second incident portions 22 corresponding to the second incident portion 22, respectively.
In addition, although the output surface 24 is a flat surface in the present embodiment, for example, cylindrical surfaces that have a bus bar in the thickness direction of the light guide 20 and bulge forward are juxtaposed in the left-right direction. It may be configured such that light is diffused and emitted by the cylindrical surface.
Further, it is preferable that a standing wall 212 exists between the second reflecting surface 232 closest to the optical axis Ax and the first incident portion 21. As described above, the actual light source 10 is not a point light source with the size of the light emission center, but a light source similar to a point light source with a size smaller than that of the first reflecting surface 231. When irradiation light from the light source 10 emitted from a position adjacent to the emission center enters the light guide 20 from the first incident surface 211, a part of the light is internally reflected by the standing wall 212. The light internally reflected by the standing wall 212 is directed to the first reflecting surface 231, and at this time, the light is inclined with respect to the optical axis Ax. Therefore, it is possible to further suppress the increase in the component of the light transmitted through the first reflecting surface 231 and the dark portion on or near the optical axis Ax.

In the light guide 20 having the above-described configuration, as shown in FIG. 3, the light traveling from the light source 10 toward the first incident portion 21 is directed to the optical axis Ax direction by the first incident surface 211. The light enters the light guide 20 while being converted into parallel light, and is internally reflected while being branched leftward and rightward with the optical axis Ax as a boundary by the pair of first reflecting surfaces 231 and 231. The light is internally reflected in the direction of the optical axis Ax while being dispersed in the left-right direction by the plurality of second reflecting surfaces 232,... And then emitted forward from the first emitting portions 24a of the emitting surface 24.
In the light guide 20, the light emitted from the light source 10 toward the left and right sides of the first incident portion 21 is guided from the second incident surfaces 221 of the second incident portions 22. After entering into the body 20 and internally reflected in the direction of the optical axis Ax by each third reflecting surface 222, the light is emitted forward from the second emitting portions 24b,.
Thus, the emission surface 24 elongated in the left-right direction emits light in a line shape with the pair of first reflection surfaces 231 and 231 interposed therebetween.

<Action and effect>
According to the lamp unit 1 described above, by causing the second incident portion 22 to actively emit light, the second emitting portion 24b between the first emitting portions 24a, ... from which the light from the second reflecting surface 232 is emitted, Compared with the conventional lamp unit in which the second emission part 24b is a dark part, the luminance unevenness of the emission surface 24 can be reduced and the emission surface 24 can emit light in a clear line shape.

  Further, after the light that has entered the light guide 20 from the first incident surface 211 is converted into parallel light in the optical axis Ax direction, the pair of first reflecting surfaces 231 and 231 that form an angle of 45 degrees with the optical axis Ax. Since the parallel light is branched in the left direction and the right direction, when viewed from the front as compared with the conventional lamp unit in which the pair of first reflecting surfaces 231 and 231 are formed in a parabolic shape, respectively. The pair of first reflecting surfaces 231 and 231 that become dark portions can be formed short in the left-right direction.

  In addition, since the pair of first reflecting surfaces 231 and 231 are flat surfaces that form an angle of 45 degrees with the optical axis Ax, the pair of first reflecting surfaces 231 and 231 are formed in a paraboloid shape, respectively. Compared with the conventional lamp unit, the dent of the front surface of the light guide 20 by this pair of 1st reflective surfaces 231 and 231 can be made small, and appearance can be improved.

<Modification>
The embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

  For example, in the said embodiment, although the 2nd reflective surface 232 was provided between the 1st incident part 21 and the 2nd incident part 22 of the first (nearest center), it shows to Fig.4 (a)-(d). As described above, the first incident portion 21 and the first second incident portion 22 may be adjacent to each other without passing through the second reflecting surface 232. Furthermore, in the said embodiment, although the 1st incident part 21 and the 1st reflective surfaces 231 and 231 were provided in the left-right direction position corresponding, the 1st incident surface 21 and the 1st reflective surface 231 and 231 were set in the left-right direction position corresponding to 1st. One incident part 21 and the first second incident part 22 may be provided. By doing in this way, compared with the said embodiment, even if it is a case where the light source 10 is brought closer to the light guide 20, the light quantity component introduced into the light guide 20 can be increased.

  Moreover, although the output surface 24 has been described as a flat surface, as shown in FIG. 5, it may be a stepped surface having a recess 241 such that the second output portion 24b becomes the bottom surface. By providing such a recess 241, the light guide 20 can be reduced in weight and the material cost can be reduced. In addition, it is preferable that the depth of this recessed part 241 is a range which does not impair the optical path to the left-right direction in the light guide 20, and does not impair the appearance from the front.

  In addition, three second reflection surfaces 232,... Are formed on each of the left and right side portions of the rear surface of the light guide 20. However, the number of the second reflection surfaces 232,. Or four or more. However, when the number of the second reflecting surfaces 232,... Is four or more, it is needless to say that it is preferable to provide the second incident portion 22 between all the adjacent second reflecting surfaces 232.

  The pair of first reflecting surfaces 231 and 231 branch light in the left and right directions around the optical axis Ax, but if the light is branched in the left and right directions, The axis Ax may not be the center.

  The lamp unit 1 is composed of a set of the light source 10 and the light guide 20. However, the plurality of sets of the light source 10 and the light guide 20 are connected to the left and right to emit light in a longer line shape. It may be a thing.

  The light source 10 is preferably a wide-angle type rather than a so-called narrow-angle type.

  In addition, the plurality of second incident portions 22 provided on the left side and the right side of the second incident portion 22 farther from the optical axis Ax than the second incident portion 22 near the optical axis Ax are light sources 10. It is preferable that the angle at which the light emitted from the light is taken in is increased. The second incident portion 22 on the side farther from the optical axis Ax irradiates in the direction of 90 °, that is, in the lateral direction than the second incident portion 22 near the optical axis Ax. It will take in light. Since the light source 10 has a light distribution pattern indicating a Lambertian light distribution, the light intensity of the light irradiated in the lateral direction is lower than the light intensity of the optical axis Ax. Therefore, by increasing the light take-in angle, the light intensity at the end in the longitudinal direction of the line-shaped light source can be increased compared to the case where the same take-in angle is obtained, and the overall uniformity is felt. Can be increased.

  Moreover, although the 1st incident part 21 was made into the area | region within 30 degrees with respect to the optical axis Ax, it may be within 40 degrees and it is preferable not to exceed 50 degrees. This is because when the angle exceeds 50 °, the surface reflection component on the first incident surface 211 increases, and the reflection component becomes significantly larger than the incident component.

DESCRIPTION OF SYMBOLS 1 Lamp unit 10 Light source 20 Light guide 21 1st incident part 211 1st incident surface 22 2nd incident part 221 2nd incident surface 222 3rd reflective surface 23 Light guide part 231 1st reflective surface 232 2nd reflective surface 24 Outgoing Surface 24a First exit portion 24b Second exit portion 241 Recess Ax Optical axis

Claims (4)

A light source having an optical axis facing forward, and a light guide disposed in front of the light source so as to extend in a direction perpendicular to the optical axis perpendicular to the optical axis,
The light guide is
A first incident portion projecting on one surface of the light source facing the light source;
A plurality of first emission portions arranged along the direction perpendicular to the optical axis, and a second emission portion formed between the adjacent first emission portions, and the other side opposite to the one surface An exit surface formed in a long direction in the direction perpendicular to the optical axis on the surface of
A first reflecting surface formed on the other surface and internally reflecting light incident on the light guide from the first incident portion toward the one surface;
A plurality of lights formed on the one surface so as to be aligned with the first incident portion along the direction orthogonal to the optical axis and internally reflected by the first reflecting surface correspond to the first emitting surface corresponding to the first emitting surface. A second reflecting surface for internal reflection individually toward the part;
Of the light emitted from the light source, the light that is formed between the second reflecting surfaces adjacent to each other and that travels to the side of the first incident portion is the second of the exit surfaces. A second incident part that is incident on the light guide while facing the emission part;
A lamp unit characterized by comprising: The first incident portion has a first incident surface formed in a convex shape facing the light source, and the light emitted from the light source is directed to the optical axis direction along the optical axis by the first incident surface. Incident into the light guide while refracting,
The first reflecting surface is positioned in the optical axis direction of the first incident portion, and the other surface is inclined individually to both sides of the optical axis orthogonal direction at an angle of 45 degrees with respect to the optical axis. Are recessed with a pair,
The second reflection surface is disposed on both sides of the first reflection surface in the direction perpendicular to the optical axis, and the first emission portion is disposed so as to be positioned in the optical axis direction of the second reflection surface, 2. The lamp unit according to claim 1, wherein the lamp unit is formed in parallel with any one of the pair of the first reflecting surfaces in the vicinity thereof. The second incident part is:
The second exit portion is disposed so as to be positioned in the optical axis direction of the second entrance portion, and
A second incident surface for allowing light emitted from the light source to enter the light guide, and a second incident surface for internally reflecting light incident from the second incident surface into the light guide in the optical axis direction along the optical axis. The lamp unit according to claim 1, further comprising three reflecting surfaces.   The lamp unit according to any one of claims 1 to 3, wherein the light guide body is formed symmetrically with respect to the optical axis orthogonal direction about the optical axis.

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