JP2019067521A - Vehicular lighting fixture - Google Patents

Abstract

To provide a vehicular lighting fixture that comprises a plate-like light guide body arranged extending substantially in lighting fixture front-rear directions and that emits light substantially uniformly with compact constitution.SOLUTION: A plate-like light guide body 22 is so configured that light from a light emitting element 30 which is made incident from a lower surface 22d thereof is totally reflected by a rear end face 22b thereof to be guided to a front end face thereof. Consequently, a projecting body which projecting large from a plate face like a conventional plate-like light guide body is eliminated and the vehicular light fixture can be constituted compactly. Then a partial region of a rear end face 22b of the plate-like light guide body 22 is made into a twice-reflection face 22bA which totally reflects light from the light emitting element 30, having reached the rear end face 22b, at two places in sequence. Consequently, light, which is not totally reflected by the rear end face 22b and exits to a rar-side space, of incident light reaching the rear end face 22b of the plate-like light guide body 22 is eliminated so as to prevent a lower region of the plate-like light guide body 22 from being viewed darkly when the front end face thereof is observed from a lighting fixture front side.SELECTED DRAWING: Figure 6

Description

  The present invention relates to a vehicular lamp provided with a plate-like light guide disposed so as to extend substantially in the longitudinal direction of the lamp.

  DESCRIPTION OF RELATED ART Conventionally, what was provided with the plate-shaped light guide arrange | positioned so that it might be extended in a substantially lamp longitudinal direction as a structure of vehicle lamps, such as a tail lamp and a clearance lamp, is known.

  For example, "Patent Document 1" describes, as such a plate-like light guide, one configured to guide light from a light emitting element incident from the rear end to the front end face thereof.

  The plate-like light guide described in this "patent document 1" is disposed along a horizontal surface, and a light incident portion which causes the light emitted from the light emitting element to be incident as the upward light at the rear end thereof; A light reflecting portion is formed to totally reflect the light incident from the light incident portion toward the front end face of the plate-like light guide.

US Patent Application Publication No. 2014/0204600

  In the plate-like light guide described in the above-mentioned "patent document 1", since the light incident part formed at the rear end part is greatly projected downward from the lower surface of the plate-like light guide, the vehicle It is difficult to make the lamp compact in size.

  On the other hand, as a configuration of the plate-like light guide, after the outgoing light from the light emitting element is made incident from its lower surface, it is totally reflected toward the front end surface by the rear end surface formed in a paraboloid shape. For example, the vehicle lamp can be made compact.

  However, in the case of adopting such a configuration, among the light incident from the lower surface of the plate-like light guide and reaching the rear end surface, the light reaching the lower region of the rear end surface is totally reflected at the rear end surface. Since the light escapes to the rear side space of the plate-like light guide without looking at the front end face of the plate-like light guide from the front side of the lamp, the lower region looks dark. For this reason, it becomes difficult to make the front end face of the plate-like light guide appear to glow substantially uniformly.

  The present invention has been made in view of such circumstances, and provides a compact configuration and substantially uniform light emission in a vehicle lamp provided with a plate-like light guide disposed so as to extend substantially in the longitudinal direction of the lamp. It is an object of the present invention to provide a vehicular lamp capable of realizing the above.

  The present invention achieves the above object by devising the configuration of a plate-like light guide.

That is, the vehicle lamp according to the present invention
A plate-shaped light guide disposed so as to extend substantially in the front-rear direction of the lamp; and a light emitting element disposed to cause light to be incident on the plate-like light guide from the plate surface of the plate-like light guide. In a vehicle lamp provided with
The plate-like light guide totally reflects the light from the light emitting element incident on the plate-like light guide at the rear end face of the plate-like light guide and guides it to the front end face of the plate-like light guide Is configured as
At least a partial region of the rear end surface is characterized in that it is configured as a two-time reflection surface that sequentially totally reflects the light from the light emitting element that has reached the rear end surface at two places.

  The type of the above-mentioned "light emitting element" is not particularly limited, and, for example, a light emitting diode, a laser diode or the like can be adopted.

  The direction of the above "plate surface" is not particularly limited, and, for example, a plate surface facing upward, a plate surface facing downward, or the like can be adopted.

  The specific structure of the “twice reflecting surface” is not particularly limited as long as the light having reached the reflecting surface twice is totally totally reflected in two places.

  The vehicle lamp according to the present invention is a plate-like light guide disposed so as to extend substantially in the front-rear direction of the lamp, the light from the light emitting element incident from the plate surface is totally reflected at the rear end face thereof Although it is configured to lead to the front end face, at least a partial region of the rear end face is configured as a two-time reflection surface that sequentially totally reflects the light from the light emitting element reaching the rear end face at two places. The following effects can be obtained.

  That is, since the plate-like light guide is configured to make the outgoing light from the light emitting element incident from the plate surface and then totally reflected by the end face after that, the plate-like light guide is from the plate surface like a conventional plate-like light guide A large protrusion can be eliminated, whereby the vehicle lamp can be made compact.

  Furthermore, since at least a partial region of the rear end surface of the plate-like light guide is configured twice as a reflection surface, the incident light that has reached the rear end surface is not totally reflected by the rear end surface, and thereafter It is possible to eliminate or minimize light coming out of the space. Therefore, when the front end face of the plate-like light guide is observed from the front side of the lamp, it is possible to prevent the lower region from appearing dark or to suppress this effectively, thereby the plate-like light guide It is possible to make the front end face of the body appear to glow substantially uniformly.

  As described above, according to the present invention, in a vehicle lamp provided with a plate-like light guide disposed so as to extend substantially in the longitudinal direction of the lamp, substantially uniform light emission can be realized with a compact configuration.

  In the above configuration, if the twice-reflecting surface of the plate-like light guide is formed so as to extend radially with a wedge-shaped cross-sectional shape, the plate-like light guide can receive incident light that has reached the twice-reflecting surface. Can be efficiently totally reflected toward the front end face of

  In the above configuration, the front end surface is the second reflection surface of the plate-like light guide, provided that the incident light from the plate surface is totally reflected as substantially parallel light toward the front end surface. It can be made to look more uniformly.

  In the above configuration, as a plate-like light guide, a reflecting surface is formed twice at a position near the plate surface at the rear end face, and a region located around the twice reflecting surface at the rear end face is configured as a one-time reflecting surface According to this configuration, it is possible to simplify the shape of the rear end face while eliminating the light which escapes to the rear side space without being totally reflected at the rear end face.

  The above-mentioned "one-time reflection surface" means a reflection surface (that is, a normal total reflection surface) configured to totally reflect the light having reached the one-time reflection surface at one time.

  In the case of adopting such a configuration, the plate-like light guide is configured to refract light emitted from the light emitting element in a direction near the plate surface in a plane orthogonal to the lamp longitudinal direction on the plate surface of the plate-like light guide. The following effects and advantages can be obtained with the configuration in which the polarized light incident portion to be incident on the light body is formed.

  That is, although it becomes difficult for incident light from the plate surface to reach the once-reflecting surface located at a distance from the light emitting element in the plane orthogonal to the lamp longitudinal direction, it reaches the once-reflecting surface due to the formation of the deflection incident part. Since the amount of light can be increased, this makes it possible to make the front end face of the plate-like light guide appear to glow more uniformly.

  At this time, the first reflection surface of the plate-like light guide is constituted by a first reflection area located closer to the light emitting element in the plane and a second reflection area adjacent to the first reflection area. If the reflection area is configured to totally reflect the incident light from the deflection / incidence portion as substantially parallel light toward the front end face of the plate-like light guide, the front end face of the plate-like light guide is further enhanced. It can be made to appear to shine uniformly.

A front view showing a vehicle lamp according to an embodiment of the present invention II-II sectional view of FIG. 1 III-III sectional view of FIG. 1 A diagram showing the main components of the above-described vehicle lamp as viewed obliquely from above and behind Details of the main part of FIG. VI direction arrow view of FIG. 5 Detail of VII part in FIG. 4 The figure similar to FIG. 6 which shows the modification of the said embodiment The figure similar to FIG. 7 which shows the said modification.

  Hereinafter, embodiments of the present invention will be described using the drawings.

  FIG. 1 is a front view showing a vehicular lamp 10 according to an embodiment of the present invention. 2 is a cross-sectional view taken along line II-II in FIG. 1, and FIG. 3 is a cross-sectional view taken along line III-III in FIG.

  In these figures, the direction indicated by X is "front" (also "front" as a vehicle) as a lamp, and the direction indicated by Y is "left direction" (also "left" as a vehicle) orthogonal to "front" However, in the lamp front view, it is “right direction”), and the direction indicated by Z is “upper direction”. The same applies to the figures other than these.

  As shown in FIGS. 1 and 2, the vehicle lamp 10 according to the present embodiment is a clearance lamp provided at the right front end of the vehicle, and is formed by the lamp body 12 and the transparent cover 14 in the form of a through hole. The light guide unit 20 and the three light emitting elements 30 are incorporated in the lamp chamber.

  The translucent cover 14 is formed so as to extend rearward and incline from the inner side (left side) in the vehicle width direction toward the outer side in the vehicle width direction.

  FIG. 4 is a view showing the light guide unit 20 and the three light emitting elements 30, which are main components of the vehicular lamp 10, viewed obliquely from above and in the rear.

  As shown also in the figure, the light guide unit 20 is a transparent synthetic resin molded product made of acrylic resin or the like, and is formed to extend in a flat plate shape along a horizontal surface. The light guide unit 20 is supported by the lamp body 12 at flange portions 20a formed on the left and right end surfaces thereof.

  The light guide unit 20 is integrally formed in a state in which three plate-like light guides 22 extending in the front-rear direction of the lamp are arranged side by side in the vehicle width direction. Each plate-like light guide 22 has the same configuration.

  As shown in FIG. 2, the front end face 22 a of each plate-like light guide 22 is inclined rearward from the inner side in the vehicle width direction toward the outer side in the vehicle width direction corresponding to the inclination angle of the light transmitting cover 14. In this case, the plate-like light guides 22 are formed so as to be continuous with each other.

  As shown in FIG. 3, the upper surface (that is, the upper plate surface) 22 c of each plate-like light guide 22 is formed as a single horizontal surface, but the lower surface (that is, the lower plate surface) 22 d is The front region 22d1 is formed as a horizontal surface and the rear region 22d2 is formed as a horizontal surface one step lower than the front region 22d1, and an intermediate region 22d3 is formed as an inclined surface connecting the two.

  At the rear end portion of the light guide unit 20, a rear flange portion 20b which protrudes in a thin plate shape from the lower end portion of the rear end surface 22b of each plate-like light guide 22 is formed. The rear flange portion 20 b is formed to extend horizontally along the rear region 22 d 2 of the lower surface 22 d of each plate-like light guide 22. At this time, the rear flange portion 20 b is formed to have a plate thickness corresponding to a step between the front region 22 d 1 and the rear region 22 d 2 of the lower surface 22 d of each plate-like light guide 22.

  The three light emitting elements 30 are all white light emitting diodes and have the same configuration.

  Each light emitting element 30 is disposed below the rear end of each plate-like light guide 22. At that time, each light emitting element 30 is supported by the lamp body 12 via the substrate 32 with the light emitting surface 30 a directed upward (specifically, in the direction immediately above). Each light emitting element 30 causes the light emitted from the light emitting surface 30a to be incident on the plate-like light guide 22 from the rear region 22d2 of the lower surface 22d. There is.

  Each plate-like light guide 22 totally reflects the light from each light emitting element 30 incident on the plate-like light guide 22 by the rear end face 22 b of the plate-like light guide 22 so as to make the plate-like light guide It is comprised so that it may guide to the 22 front end surface 22a.

  A plurality of fisheye lens elements 22s are formed on the front end face 22a of each plate-like light guide 22. The light guided to the front end face 22a in each of the fisheye lens elements 22s is diffused and emitted in the vertical and horizontal directions It has become.

  In the following, the plate-like light guide 22 located at the innermost side in the vehicle width direction is picked up, and a specific configuration of the rear end face 22b will be described.

  FIG. 5 is a detail view of the main part of FIG. 3, and FIG. 6 is a view taken in the direction of arrow VI in FIG. 7 is a detailed view of a part VII of FIG.

  As also shown in these figures, in the rear end face 22b of the plate-like light guide 22, a part of the region located closer to the lower plate face 22d receives the light from the light emitting element 30 which reaches the rear end face 22b. Is totally reflected at two places sequentially as a twice reflecting surface 22bA.

  On the other hand, in the rear end face 22b of the plate-like light guide 22, a region located around the twice reflective surface 22bA is a single reflection that totally reflects the light from the light emitting element 30 that has reached the rear end face 22b at one time. It is comprised as surface 22bB.

  The boundary surface 22b1 between the twice reflecting surface 22bA and the once reflecting surface 22bB is a vertical plane perpendicular to the front-rear direction of the lamp near the front end edge of the light emitting surface 30a of the light emitting element 30.

  The twice reflecting surface 22bA is formed so as to extend radially with a wedge-shaped cross-sectional shape.

  Specifically, this twice reflection surface 22bA passes an imaginary line B located near the lower side of the light emission center of the light emitting element 30 (that is, the center of the light emission surface 30a) so as to pass an axis Ax extending in the longitudinal direction of the lamp It consists of a plurality of ridges 22bAs extending radially around the center.

  The virtual point B is a virtual point light source with respect to the light emission center A when considering that light emitted from the light emission center A is refracted at the rear region 22d2 of the lower surface 22d when entering the plate-like light guide 22. It is a point that indicates the position of the outline.

  Each ridge 22bAs is formed of a total reflection prism having a wedge-shaped cross section, and a pair of slopes 22bAs1 and 22bAs2 constituting the ridge 22bAs is formed of a convex curved surface. And each protruding part 22bAs is formed so that the section shape may become large gradually as it leaves from axis Ax.

  As a result, each ridge 22bAs causes the light from the light emission center A incident on the plate-like light guide 22 to be totally reflected sequentially by the pair of slopes 22bAs1 and 22bAs2 to form substantially parallel light directed in the front direction of the lamp. It is supposed to

  On the other hand, the one-time reflecting surface 22bB is configured by a paraboloid of revolution having an imaginary point B as a focal point and an axis Ax as a central axis.

  Thereby, the first reflection surface 22bB causes the light from the light emission center A incident on the plate-like light guide 22 to be totally reflected by the first reflection surface 22bB into substantially parallel light directed in the front direction of the lamp. It has become.

  The outer peripheral edge of the boundary surface 22b1 has an arc shape which is slightly larger than the twice-reflecting surface 22bA centered on the axis line Ax.

  Since this boundary surface 22b1 is located in the vicinity of the front end edge of the light emitting surface 30a of the light emitting element 30, light from the light emitting element 30 incident on the plate-like light guide 22 never reaches the boundary surface 22b1. Also, the incident angle when this light reaches the reflecting surface 22bB once has a value greater than or equal to the critical angle.

  Next, the operation and effect of the present embodiment will be described.

  The vehicle lamp 10 according to the present embodiment is the light from the light emitting element 30 that is incident from the lower surface (lower plate surface) 22 d to the plate-like light guide 22 disposed so as to extend in the front-rear direction of the lamp Is totally reflected at the rear end face 22b and guided to the front end face 22a, but a partial region of the rear end face 22b is at two places of light from the light emitting element 30 that has reached the rear end face 22b. Since the reflection surface 22bA is configured to be sequentially totally reflected twice, the following effects can be obtained.

  That is, since the plate-like light guide 22 is configured to make the light emitted from the light emitting element 30 enter from the lower surface 22 d and then be totally reflected by the end face 22 b, it is similar to the conventional plate-like light guide Protrusions that greatly project from the plate surface can be eliminated, whereby the vehicular lamp 10 can be made compact.

  Furthermore, since the plate-like light guide 22 is configured such that a partial region of the rear end surface 22b is formed twice as the reflection surface 22bA, total reflection of the incident light reaching the rear end surface 22b is performed by the rear end surface 22b. It is possible to eliminate the light which escapes to the rear side space without doing it. Therefore, when the front end face 22a of the plate-like light guide 22 is observed from the front side of the lamp, it is possible to prevent the lower region from appearing dark, whereby the front end face 22a of the plate-like light guide 22 becomes It becomes possible to make the light appear to be substantially uniform.

  As described above, according to the present embodiment, in the vehicular lamp 10 provided with the plate-like light guide 22 disposed so as to extend in the front-rear direction of the lamp, substantially uniform light emission can be realized with a compact configuration.

  At this time, since the twice-reflecting surface 22bA of the plate-like light guide 22 of the present embodiment is formed so as to radially extend in a wedge-shaped cross-sectional shape, incident light reaching the twice-reflecting surface 22bA Total reflection can be efficiently performed toward the front end face 22 a of the plate-like light guide 22.

  Moreover, since the twice reflecting surface 22bA is configured to totally reflect incident light from the lower surface 22d of the plate-like light guide 22 as substantially parallel light toward the front end surface 22a, the front end surface 22a is It can be made to look more uniformly.

  Further, in the plate-like light guide 22 of the present embodiment, the reflecting surface 22bA is formed twice at a position near the lower surface 22d in the rear end face 22b, and the area located around it is a reflecting surface once (that is, normal Since it is configured as a total reflection surface) 22bB, it is possible to simplify the shape of the rear end surface 22b after eliminating the light that escapes to the rear side space without being totally reflected by the rear end surface 22b. .

  Moreover, since the first reflection surface 22bB is configured to totally reflect incident light from the lower surface 22d of the plate-like light guide 22 as substantially parallel light toward the front end surface 22a, the front end surface 22a is It can be made to appear more uniformly in the light.

  At this time, in the present embodiment, since the boundary surface 22b1 between the twice reflecting surface 22bA and the once reflecting surface 22bB is located in the vicinity of the front end edge of the light emitting surface 30a of the light emitting element 30, the once reflecting surface 22bB The light emitted from the light emitting element 30 can be totally totally reflected.

  Further, since this boundary surface 22b1 is formed by a vertical surface perpendicular to the lamp longitudinal direction in the vicinity of the front end edge of the light emitting surface 30a of the light emitting element 30, the light emitted from the light emitting element 30 enters the boundary surface 22b1. It is possible to prevent in advance the generation of stray light by total reflection at the boundary surface 22b1.

  In the above embodiment, each of the twice reflecting surface 22bA and the once reflecting surface 22bB that constitute the rear end face 22b of the plate-like light guide 22 substantially parallels the incident light from the lower surface 22d of the plate-like light guide 22. Although described as being configured to reflect light, one or both of the twice reflecting surface 22 b A and the once reflecting surface 22 b B may be configured to be reflected as diffused light. .

  In the above embodiment, the light emitted from the light emitting element 30 is described as being made to be incident from the lower surface 22 d of the plate-like light guide 22, but it is configured to be incident from the upper surface 22 c It is also possible.

  In the above embodiment, the three sets of plate-like light guides 22 and the light emitting elements 30 are described as being arranged side by side in the vehicle width direction, but two or less or four or more of these may be arranged It is also possible.

  In the said embodiment, although demonstrated as what was formed so that the light guide unit 20 might be extended along a horizontal surface, it is also possible to set it as the structure formed so that it might extend in the other direction.

  In the above embodiment, although the case where the vehicle lamp 10 is a clearance lamp provided at the right front end of the vehicle has been described, a daytime running lamp, a tail lamp, a stop lamp, a turn signal lamp, besides the clearance lamp Regardless of the location or function provided in the vehicle, such as a room lamp, the same function and effect as the above embodiment can be obtained by adopting the same configuration as the above embodiment.

  Next, modifications of the above embodiment will be described.

  FIGS. 8 and 9 are views similar to FIGS. 6 and 7 showing the configuration of this modification.

  As shown in these figures, the basic configuration of this modification is the same as in the above embodiment, but the configuration of each plate-like light guide 122 in the light guide unit 120 is the same as in the above embodiment. Some differences.

  Specifically, the plate-like light guide 122 of this modification is formed with a thinner plate thickness than the plate-like light guide 22 of the above-described embodiment, and the left and right A pair of polarized light incident portions 122e is formed. Furthermore, in the plate-like light guide 122 of this modification, the shape of the rear end face 122 b is partially different from that in the above embodiment.

  That is, the upper surface 122c of the plate-like light guide 122 of this modification is set at a lower position than in the case of the above embodiment, and the pair of left and right polarized light incidence parts 122e are in the vertical plane including the axis Ax. It is formed in symmetrical positional relationship.

  Each polarized light incident portion 122 e is configured to refract light emitted from the light emitting element 30 in a direction closer to the lower surface 122 d (that is, a direction farther away from the left and right sides) in a plane orthogonal to the axis Ax. It is supposed to be incident on the

  In order to realize this, each of the polarized light incident portions 122e is formed to extend in the longitudinal direction of the lamp with a wedge-shaped sectional shape, and the slope on the vertical surface side including the axis Ax is formed at an angle close to the vertical surface There is.

  Each deflection incidence part 122e is formed to extend in parallel with the axis Ax over a range from the rear end edge of the rear flange part 120b of the light guide unit 120 to the vicinity of the front end edge of the rear region 122d2.

  Similarly to the plate-like light guide 22 of the above-described embodiment, the plate-like light guide 122 of this modification also has the twice reflecting surface 122 b A formed at a position near the lower surface 122 d in the rear end face 122 b. An area to be formed is configured as a one-time reflection surface 122bB.

  At this time, the twice-reflecting surface 122bA is formed of a plurality of ridges 122bAs as in the above embodiment, and each ridge 122bAs is from the light emission center A incident on the plate-like light guide 122. The light is totally reflected sequentially by the pair of slopes 122bAs1 and 122bAs2 to be approximately parallel light directed in the front direction of the lamp.

  On the other hand, the first reflection surface 122bB is a first reflection region 122bB1 positioned closer to the light emitting element 30 in the left-right direction (that is, closer to the vertical surface including the axis Ax), and a pair of second reflection regions 122bB2 adjacent to the left and right sides thereof. And consists of.

  The first reflection area 122bB1 is configured by a paraboloid of revolution having the imaginary point B as the focal point and the axis Ax as the central axis, as in the case of the single-time reflection surface 22bB of the above-described embodiment.

  On the other hand, the second reflection area 122bB2 is formed of a paraboloid of revolution having an axis extending in the longitudinal direction of the lamp as passing through an imaginary point C located near the upper side of the light emission center A of the light emitting element 30. .

  The virtual point C is a virtual point with respect to the light emission center A, considering that light emitted from the light emission center A is refracted by the deflection light incident part 122e when entering the plate-like light guide 122 at each deflection light incident part 122e. It is a point that indicates a rough position to be a point light source.

  In this modification, mainly from the light emission center A incident on the plate-like light guide 122 from the portion between the left and right pair of the polarization incidence parts 122 e in the rear region 122 d 2 of the lower surface 122 d of the plate-like light guide 122 The light is totally reflected as substantially parallel light toward the lamp front direction in each of the twice reflecting surface 122bA and the first reflecting area 122bB1 of the once reflecting surface 122bB, and a rear area 122d2 of the lower surface 122d of the plate light guide 122 The light from the light emission center A, which is incident on the plate-like light guide 122 from each of the deflection / incidence parts 122e, is totally reflected as substantially parallel light toward the front of the lamp in the second reflection area 122bB2 of the reflection surface 122bB. It has become.

  Also in this modification, the boundary surface 122b1 between the two-time reflection surface 122bA and the one-time reflection surface 122bB is formed by a vertical plane orthogonal to the front-rear direction of the lamp near the front end edge of the light emitting surface 30a of the light emitting element 30 There is.

  As in the present modification, deflection is performed such that light emitted from the light emitting element 30 is refracted toward the lower surface 122 d in the rear region 122 d 2 of the lower surface 122 d of the plate-shaped light guide 122 so as to be refracted toward the lower surface 122 d. With the configuration in which the incident part 122e is formed, the following effects can be obtained.

  That is, although it becomes difficult for incident light from the rear region 122d2 of the lower surface 122d to reach the once-reflecting surface 122bB located away from the light emitting element 30 in the left and right directions, the one-time reflecting surface 122bB The amount of light reaching can be increased, which allows the front end surface of the plate-like light guide 122 to be more uniformly viewed as glowing.

  Moreover, in the present modification, the first reflection surface 122bB of the plate-like light guide 122 is constituted by the first reflection region 122bB1 positioned closer to the light emitting element 30 in the left-right direction and the second reflection region 122bB2 adjacent thereto. The second reflection area 122bB2 is formed by a paraboloid of revolution having an axis extending in the longitudinal direction of the lamp as a central axis, passing through an imaginary point C located near the upper side of the light emission center A of the light emitting element 30 Therefore, the following effects can be obtained.

  That is, if it is assumed that the portion of the second reflection area 122bB2 in the one time reflection surface 122bB is formed by a curved surface in which the first reflection area 122bB1 is extended, as indicated by a two-dot chain line in FIG. The light reflected by this portion is not substantially parallel light directed to the front end face of the plate-like light guide 122 but light directed to a direction away obliquely upward from the axis Ax.

  On the other hand, in the present modification, since the second reflection area 122bB2 is configured as a paraboloid whose axis is the axis extending in the front-rear direction of the lamp so as to pass through the imaginary point C, the polarization incidence part 122e Incident light from the light source can be totally reflected as substantially parallel light toward the front end face of the plate-like light guide 122, whereby the front end face of the plate-like light guide 122 can be viewed more uniformly Can.

  The numerical values shown as specifications in the above-described embodiment and the modifications thereof are merely examples, and it goes without saying that these may be appropriately set to different values.

  Moreover, this invention is not limited to the structure described in the said embodiment and its modification example, The structure which added the various change except this is employable.

DESCRIPTION OF SYMBOLS 10 Vehicle lamp 12 Lamp body 14 Light transmission cover 20, 120 Light guide unit 20a Flange part 20b, 120b Rear flange part 22, 122 Plate-like light guide 22a Front end surface 22b, 122b Rear end surface 22bA, 122bA 2 times reflective surface 22bAs, 122bAs ridge 22bAs1, 22bAs2, 122bAs1, 122bAs2 Slope 22bB, 122bB once reflecting surface 22b1, 122b1 boundary surface 22c, 122c upper surface (upper plate surface)
22d, 122d lower surface (lower plate surface)
22d1 front area 22d2, 122d2 rear area 22d3 middle area 22s fisheye lens element 30 light emitting element 30a light emitting surface 122bB1 first reflection area 122bB2 second reflection area 122e polarization incident part A light emission center Ax axis B, C virtual point

Claims (6)

A plate-shaped light guide disposed so as to extend substantially in the front-rear direction of the lamp; and a light emitting element disposed to cause light to be incident on the plate-like light guide from the plate surface of the plate-like light guide. In a vehicle lamp provided with
The plate-like light guide totally reflects the light from the light emitting element incident on the plate-like light guide at the rear end face of the plate-like light guide and guides it to the front end face of the plate-like light guide Is configured as
A vehicle lamp characterized in that at least a partial region of the rear end surface is configured as a two-time reflection surface that sequentially totally reflects the light from the light emitting element reaching the rear end surface at two places.   The vehicular lamp according to claim 1, wherein the twice reflecting surface is formed so as to radially extend in a wedge-shaped cross-sectional shape.   The vehicular lamp according to claim 1 or 2, wherein the twice reflecting surface is configured to totally reflect incident light from the plate surface as substantially parallel light directed to the front end face. The double reflection surface is formed at a position near the plate surface at the rear end surface,
The vehicle lamp according to any one of claims 1 to 3, wherein a region of the rear end surface located around the second reflection surface is configured as a first reflection surface.   On the plate surface, there is formed a deflection incident portion for entering the plate-like light guide in such a manner that light emitted from the light emitting element is refracted in the direction near the plate surface in a plane orthogonal to the lamp longitudinal direction. The vehicle lamp according to claim 4, characterized in that: The one-time reflection surface includes a first reflection area located closer to the light emitting element in the plane, and a second reflection area adjacent to the first reflection area.
6. The vehicular lamp according to claim 5, wherein the second reflection area is configured to totally reflect incident light from the deflection / incidence portion as substantially parallel light traveling toward the front end face.

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