JP2016207348A - Light guide body for vehicle, lighting fixture for vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve uniform light emission of an emission surface of a light guide body having a rod shape.SOLUTION: This invention includes first light guide parts 91F, 91B having a rod shape. The first light guide parts 91F, 91B include: incident surfaces 910, 911; an emission surface 912; a first reflection surface 914; a second reflection surface 913; and a coupling surface 915. Heights H1, H2, H3 of the second reflection surface 913 increase as they go away from the incident surfaces 910, 911. That is, they gradually change so as to increase in a curved manner. Depths T1, T2, T3 of the first reflection surface 914 gradually increase as they go away from the incident surfaces 910, 911. As a result, uniform light emission of the emission surface 912 of the first light guide parts 91F, 91B having a rod shape can be improved.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle light guide. The present invention also relates to a vehicular lamp including a vehicular light guide.

  Conventionally, a vehicular light guide and a vehicular lamp provided with a vehicular light guide have been conventionally used (for example, Patent Document 1 and Patent Document 2). Hereinafter, the conventional vehicle lamp of Patent Documents 1 and 2 will be described.

  The conventional vehicle display of Patent Document 1 includes a light source and a light guide. The light guide has a light incident surface, a light exit surface, and a light redirecting surface disposed on the opposite side of the light exit surface. The light redirecting surface has a plurality of protrusions and intervening lands. Each of the plurality of protrusions has a riser, a plateau, and a facet. An imaginary line constructed by drawing a line through the apex formed at the intersection of the riser and plateau of the protrusion forms an angle with the line drawn through the plane formed by the light exit surface. Light rays from the light source enter the light guide from the light incident surface, are reflected by the light redirecting surface, and are uniformly emitted from the light emitting surface to the outside.

  The conventional vehicular lamp of Patent Document 2 includes a lamp body, a through hole cover, a light guide, and a light emitting diode. The light guide has an incident end surface, an output front surface, and a plurality of reflecting elements and a front displacement portion provided on the rear surface. The forward displacement amount of the forward displacement portion is set to a predetermined value. The light emitted from the light emitting diode enters the light guide from the incident surface, is internally reflected by the plurality of reflecting elements, and is uniformly emitted from the front surface to the outside.

Special table 2003-523536 gazette JP2013-62110A

  In the conventional vehicle display disclosed in Patent Document 1, it is important to improve the uniform light emission on the light emitting surface of the light guide. Moreover, in the conventional vehicle lamp of the said patent document 2, it is important to improve the uniform light emission of the output front surface of a light guide.

  The problem to be solved by the present invention is that it is possible to improve the uniform light emission of the exit surface of the rod-shaped light guide.

  The present invention (invention according to claim 1) is a light guide having a rod shape, and is provided on an end surface of the light guide so that light enters the light guide from the outside, and the light guide An exit surface that is provided on the side of the body and that emits light incident on the light guide from the light guide to the outside, and a light guide that is provided on the side opposite to the exit surface of the light guide A reflecting surface for reflecting light incident on the body into the light guide, and the reflecting surface is a bottom surface recessed from the side surface of the light guide into the light guide and parallel to the longitudinal direction of the light guide Alternatively, it has a first reflecting surface provided substantially in parallel, and a second reflecting surface provided inclined from the first reflecting surface into the light guide in the longitudinal direction of the light guide, A large number of first reflection surfaces and second reflection surfaces are provided continuously in the longitudinal direction of the light guide through the connecting surface, and the height of the second reflection surface is the height of the light guide. The length of the perpendicular from the surface to the intersecting line of the second reflecting surface and the connecting surface is gradually changed so as to increase from the incident surface side to the opposite side to the incident surface. The length of the perpendicular line from the side surface of the light guide to the first reflecting surface is gradually changed so as to increase from the incident surface side to the opposite side to the incident surface. It is characterized by.

  In the present invention (the invention according to claim 2), the light guide has a curved shape, and the gradual change rate of the height of the second reflection surface and the gradual change rate of the depth of the first reflection surface are the same. The larger the radius of curvature of the light body, the smaller.

  The present invention (the invention according to claim 3) is an additional light guide having a plate shape provided between a plurality of light guides and side surfaces other than the exit surface and the reflection surface of the plurality of light guides. It is comprised from these.

  This invention (the invention according to claim 4) is the lamp housing and the lamp lens that define the lamp chamber, the light source disposed in the lamp chamber, and the light from the light source is incident. The vehicle light guide according to Item 1 is provided.

  According to the present invention (the invention according to claim 5), a plurality of light guides having a curved shape are arranged in the front and rear in the optical axis direction in the lamp chamber, and the light guide on the front side in the optical axis direction Is smaller than the curvature radius of the light guide on the rear side in the optical axis direction, the gradual change rate of the height of the second reflection surface of the light guide on the front side in the optical axis direction and the depth of the first reflection surface The gradual change rate of the height is larger than the gradual change rate of the height of the second reflecting surface of the rear light guide in the optical axis direction and the gradual change rate of the depth of the first reflecting surface. .

  In the vehicle light guide and the vehicle lamp according to the present invention, the light incident on the light guide is reflected by the second reflection surface and emitted to the outside from the emission surface, and the light incident on the light guide is The light is reflected by the first reflecting surface and guided to the opposite side with respect to the incident surface. Therefore, in the vehicle light guide and the vehicle lamp according to the present invention, the height of the second reflecting surface gradually changes so as to increase in a curve from the incident surface side toward the opposite side to the incident surface. Further, the amount of light (flux) emitted from the exit surface is changed to the entrance surface side by gradually changing so that the depth of the first reflecting surface increases from the entrance surface side toward the opposite side to the entrance surface. To the opposite side with respect to the incident surface. As a result, the vehicle light guide and the vehicle lamp according to the present invention can improve uniform light emission on the exit surface of the rod-shaped light guide.

FIG. 1 is a front view showing an embodiment of a vehicle light guide and a vehicle lamp according to the present invention. FIG. 2 is a partial cross-sectional explanatory view (partially horizontal cross-sectional explanatory view) showing the vehicle light guide. FIG. 3 is a partial vertical cross-sectional explanatory view (partially vertical cross-sectional explanatory view) showing the vehicle light guide. FIG. 4 is an explanatory diagram showing a gradual change in the height of the second reflecting surface. FIG. 5 is an explanatory diagram showing a gradual change in the amount of light (light flux) guided through the vehicle light guide. FIG. 6 is a partial cross-sectional explanatory view (partially horizontal cross-sectional explanatory view) showing the first reflection surface and the second reflection surface of the vehicle light guide. FIG. 7 is a front view showing the vehicle light guide. FIG. 8 is a plan view (viewed in the direction of arrow VIII in FIG. 7) showing the vehicle light guide. FIG. 9 is a side view (a view taken along arrow IX in FIG. 7) showing the vehicle light guide. FIG. 10 is a cross-sectional explanatory view (cross-sectional explanatory view taken along the line XX in FIG. 7) showing light emitted from the two first light guide portions and one second light guide portion of the vehicle light guide. . FIG. 11 is a cross-sectional explanatory view (cross-sectional explanatory view taken along the line XI-XI in FIG. 7) showing light emitted from the first light guide portion of the light guide for a vehicle and an optical path in the first light guide portion.

  Hereinafter, an example of an embodiment of a vehicle light guide and a vehicle lamp according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment. In this specification, front, rear, upper, lower, left, and right are front, rear, upper, lower, left, and right when the vehicle lamp according to the present invention is mounted on a vehicle.

  1 and 7 to 9, the symbol “O” indicates the outside of the vehicle. The symbol “I” indicates the inside of the vehicle. The symbol “U” indicates the upper side of the vehicle when the front side F is viewed from the driver side. The symbol “D” indicates the lower side of the vehicle when the front side F is viewed from the driver side. The symbol “F” indicates the front side of the vehicle (the forward direction side of the vehicle). The symbol “B” indicates the rear side of the vehicle.

  In FIG. 2, FIG. 3, FIG. 6, FIG. 10, and FIG. 3A is a cross-sectional view taken along line IIIA-IIIA in FIG. FIG. 3B is a cross-sectional view taken along line IIIB-IIIB in FIG. FIG. 3C is a cross-sectional view taken along line IIIC-IIIC in FIG. In FIG. 4, the vertical axis indicates the height of the second reflecting surface, and the horizontal axis indicates the distance from the incident surface. In FIG. 5, the vertical axis indicates the amount of light (light flux) in the first light guide, and the horizontal axis indicates the distance from the incident surface.

(Description of Configuration of Embodiment)
Hereinafter, the configuration of the vehicle light guide and the vehicle lamp according to this embodiment will be described. In FIG. 1, reference numeral 1 denotes a vehicular lamp according to this embodiment. The vehicle lamp 1 is, for example, a clearance lamp of a front combination lamp such as a vehicle headlamp or a headlamp.

(Description of vehicle lamp 1)
The vehicular lamp 1 is mounted on both the left and right sides of the front portion of a vehicle (not shown). The design surface of the front portion of the vehicle is along the front-rear direction of the vehicle (from the rear side B of the vehicle toward the front side F), in the vertical direction (from the upper side U to the lower side D) and in the left-right direction (outside O It is inclined toward the inner side I). As a result, the design surfaces on the left and right sides of the front portion of the vehicle are formed from three-dimensional curved surfaces.

  In the right vehicle lamp 1 mounted on the right side of the vehicle, the outside O of the vehicle is the right side and the inside I of the vehicle is the left side. On the other hand, in the left vehicle lamp mounted on the left side of the vehicle, the outside O of the vehicle is the left side and the inside I of the vehicle is the right side.

  Hereinafter, the right vehicle lamp 1 mounted on the right side of the vehicle will be described. Note that the left-hand vehicular lamp mounted on the left side of the vehicle is substantially the same as the right-hand vehicular lamp 1 in the left-right direction, and the description thereof is omitted.

  As shown in FIG. 1, the vehicular lamp 1 includes a lamp housing 2, a lamp lens (for example, a transparent outer cover, an outer lens, etc.) 3, an inner lens 4, an inner panel (inner housing) 5, The head lamp unit 6, the turn signal lamp unit 7, light sources 80 and 81, and a light guide 9 as a vehicle light guide according to this embodiment are provided. The light sources 80 and 81 and the light guide 9 constitute a clearance lamp unit.

(Description of the lamp housing 2 and the lamp lens 3)
The lamp housing 2 is composed of a light impermeable member. The lamp housing 2 has a shape in which an outer side O, a front side F, and an upper side U of the vehicle are opened, while an inner side I, a rear side B, and a lower side D of the vehicle are closed.

  The lamp lens 3 is composed of a light transmissive member. The lamp lens 3 has a shape in which the inner side I, the rear side B, and the lower side D of the vehicle are open, while the outer side O, the front side F, and the upper side U of the vehicle are closed. The design surface of the closed portion of the lamp lens 3 extends along the design surface of the front part of the vehicle from the rear side B to the front side F of the vehicle, from the upper side U to the lower side D and the outer side O of the vehicle. Inclined towards I. As a result, the design surface of the lamp lens 3 is composed of a three-dimensional curved surface, like the design surfaces on the left and right sides of the front portion of the vehicle.

  The opening edge of the lamp housing 2 and the opening edge of the lamp lens 3 are fixed. Thereby, the lamp chamber 10 is partitioned. In the lamp chamber 10, the inner lens 4, the inner panel 5, the head lamp unit 6, the turn signal lamp unit 7, the light sources 80 and 81, and the light guide 9 are arranged, respectively.

(Description of inner lens 4 and inner panel 5)
The inner lens 4 is composed of a light transmissive member. Although not shown, the inner lens 4 is disposed between the lamp lens 3 and the light guide 9. The inner lens 4 diffuses and transmits the emitted lights L11, L21, and L31 emitted from the light guide 9 along the optical axis direction Z or substantially along the optical axis direction Z to the lamp lens 3 side. The inner lens 4 is attached to the lamp housing 2 directly or via another member. The optical axis direction Z is parallel or substantially parallel to an axis in the front-rear direction of the vehicle, that is, a number line in the front-rear direction.

  The inner panel 5 is made of a light impermeable member. Although not illustrated, the inner panel 5 is disposed between the lamp lens 3 and the light sources 80 and 81 and the end of the light guide 9. As a result, the end portions of the light sources 80 and 81 and the light guide 9 are covered with the inner panel 5 when viewed from the lamp lens 3. Further, a part of the head lamp unit 6 and a part of the turn signal lamp unit 7 are also covered with the inner panel 5 when viewed from the lamp lens 3. The inner panel 5 is attached to the lamp housing 2 directly or via another member.

(Description of the headlamp unit 6 and the turn signal lamp unit 7)
The head lamp unit 6 switches between a low beam light distribution pattern (not shown) and a high beam light distribution pattern (not shown) and irradiates the front of the vehicle from the lamp lens 3. The headlamp unit 6 is attached to the lamp housing 2 via an optical axis adjusting mechanism (not shown).

  The turn signal lamp unit 7 emits a predetermined light distribution pattern (not shown) of the turn signal lamp from the lamp lens 3 to the front of the vehicle. The turn signal lamp unit 7 is attached to the lamp housing 2 directly or via another member.

(Description of light sources 80 and 81)
As shown in FIG. 1, the light sources 80 and 81 are self-luminous semiconductor light sources such as LEDs, OELs or OLEDs in this example. The light sources 80 and 81 are composed of a light emitting unit and a substrate. The four light sources 80 and 81 are arranged so that the light-emitting portions face the incident surfaces 910 and 911 at both ends of the two first light guide portions 91F and 91B of the light guide body 9, respectively.

  That is, of the four light sources 80, 81, one of the two light sources (hereinafter referred to as “first light source”) 80 is on the outer side O and the rear side B of the vehicle in the lamp chamber 10. And it is arrange | positioned in the location of the upper side U. In FIG. 1, only one first light source 80 is shown. Of the four light sources 80 and 81, the other two light sources (hereinafter referred to as “second light sources”) 81 are inside I and front F and below the vehicle in the lamp chamber 10. It is arranged at the position of D. The light sources 80 and 81 are attached to the lamp housing 2 directly or via other members.

(Description of the light guide 9)
The light guide 9 is a member that guides light from the light sources 80 and 81 from the incident surfaces 910 and 911 to the output surfaces 912 and 922 by using total internal reflection (internal reflection). In this example, the light guide 9 is made of a transparent resin material such as acrylic resin, PC (polycarbonate), or PMMA (polymethyl methacrylate, methacrylic resin). The light guide 9 is attached to the lamp housing 2 directly or via another member.

  As shown in FIGS. 1 and 7 to 9, the light guide 9 has a three-dimensionally complicated long shape along the design surface of the lamp lens 3 constituted by a three-dimensional curved surface. That is, in the front view of FIGS. 1 and 7, the intermediate portion of the light guide 9 is inclined from the outer side O of the vehicle toward the inner side I and from the upper side U of the vehicle toward the lower side D. Similarly, one end portion of the outer side O of the light guide 9 on the vehicle is curved toward the lower side D of the vehicle and twisted in the front-rear direction of the vehicle. Similarly, the other end portion of the inner side I of the light guide 9 is curved toward the outer side O of the vehicle, is curved toward the lower side D of the vehicle, and is twisted in the longitudinal direction of the vehicle. ing.

  In the plan view of FIG. 8, the intermediate portion of the light guide 9 is inclined from the outer side O of the vehicle toward the inner side I and from the rear side B of the vehicle toward the front side F. Similarly, one end portion of the outer side O of the light guide 9 is curved toward the outer side O of the vehicle and twisted in the front-rear direction of the vehicle. Similarly, the other end portion of the light guide 9 on the inner side I of the vehicle is curved so as to be substantially parallel to the intermediate portion of the light guide 9 and is twisted in the front-rear direction of the vehicle.

  In the side view of FIG. 9, the intermediate portion of the light guide 9 is inclined from the rear side B of the vehicle toward the front side F and from the upper side U of the vehicle toward the lower side D. Similarly, one end portion on the rear side B of the light guide 9 is curved toward the lower side D of the vehicle and twisted in the front-rear direction of the vehicle. Similarly, the other end portion of the light guide 9 on the front side F of the vehicle curves toward the rear side B of the vehicle, curves toward the lower side D of the vehicle, and extends in the longitudinal direction of the vehicle. It is twisted.

  The light guide 9 includes first light guides 91F and 91B as light guides having two rod shapes, a second light guide 92 as an additional light guide having a plate shape, Is provided. The two first light guide portions 91F and 91B each have an equivalent or substantially equivalent circular cross section or a substantially circular cylindrical shape, that is, a round bar shape, from one end to the other end. The diameters (diameters) Φ of the two first light guide portions 91F and 91B are about 6 to 10 mm in this example. Also, the length of the two first light guide portions 91F and 91B, that is, one end surface of the first light guide portions 91F and 91B and one of the incident surfaces (hereinafter referred to as “first incident surface”). The distance from 910 to the other incident surface of the first light guide portions 91F and 91B and the other incident surface (hereinafter referred to as “second incident surface”) 911 is about 500 in this example. ~ 1000 mm. Thus, the length of the first light guides 91F and 91B is based on the diameter Φ of the first light guides 91F and 91B. One sheet of the second light guide portion 92 has an equivalent or substantially equivalent cross-sectional rectangular or substantially rectangular plate shape from one end to the other end.

  The first light guides 91F and 91B and the second light guide 92 are formed in a longitudinal direction O1 from the one end to the other end of the first light guides 91F and 91B (the first light guides 91F and 91B). , And a longitudinal direction O2 from one end to the other end of the second light guide 92 (see above). The second light guides 92 are integrally connected to each other along the center line direction of the second light guide 92 (see the point in FIG. 10). That is, one side surface of the first light guide portions 91F and 91B in the longitudinal direction O1 is integrally connected to both side surfaces of the second light guide portion 92 in the longitudinal direction O2. The longitudinal direction O2 of the second light guide unit 92 is not shown by a one-dot chain line like the longitudinal direction O1 of the first light guide units 91F and 91B, but the first light guide unit 91F, It is linear like the longitudinal direction O1 of 91B.

  Bent portions are provided at both end portions of the light guide 9. That is, the longitudinal directions O1 of the first light guide portions 91F and 91B and the longitudinal direction of the second light guide portion 92 are provided at both ends of the first light guide portions 91F and 91B and the second light guide portion 92. A bent portion is provided that is bent so that the direction O2 maintains a relative positional relationship between the inside and the outside in the direction of the radius of curvature.

(Description of the first light guides 91F and 91B)
Two said 1st light guide parts 91F and 91B are respectively the said entrance surfaces 910 and 911, the said output surface 912, the 1st reflective surface 914 as a total reflection surface, and the 2nd reflection as a prism reflective surface. A surface 913 and a connecting surface 915 are provided. The two first light guide portions 91F and 91B each have a curved shape as shown in FIG. Two said 1st light guide parts 91F and 91B are arrange | positioned in the said light chamber 10 at the front-back in the said optical axis Z direction. Of the two first light guide portions 91F and 91B, the curvature radius of the first light guide portion 91F on the front side in the optical axis Z direction (hereinafter referred to as “front side first light guide portion 91F”) is: Of the two first light guide portions 91F and 91B, the radius of curvature of the first light guide portion 91B on the rear side in the optical axis Z direction (hereinafter referred to as “rear side first light guide portion 91B”). Smaller than.

  The incident surfaces 910 and 911 are provided on both end surfaces of the first light guide portions 91F and 91B. The incident surfaces 910 and 911 are opposed to the light emitting portions of the light sources 80 and 81. The centers of the incident surfaces 910 and 911 and the center of the light emitting part coincide or substantially coincide. The entrance surfaces 910 and 911 are made of a flat surface, a curved surface, or a combination of a flat surface and a curved surface. The incident surfaces 910 and 911 allow light emitted from the light emitting unit to enter the first light guide units 91F and 91B.

  The two first incident surfaces 910 are located at locations where the two first light sources 80 are arranged, that is, at locations outside the vehicle O and rear B and above U in the lamp chamber 10. Has been placed. The two second incident surfaces 911 are located at a place where the two second light sources 81 are arranged, that is, at the inside I, the front F, and the lower D of the vehicle in the lamp chamber 10. Has been placed.

  The emission surface 912 is provided on a side surface of the first light guides 91F and 91B that faces the lamp lens 3 and the inner lens 4. As shown in FIGS. 3 and 10, the emission surface 912 is an arc surface having a substantially circular cross section. The exit surface 912 emits the incident lights L10 and L20 incident on the first light guide portions 91F and 91B from the incident surfaces 910 and 911 and the reflected lights L12 and L22 from the second reflection surface 913. The light beams L11 and L21 are emitted from the first light guide portions 91F and 91B to the outside along the optical axis direction Z or substantially along the optical axis direction Z.

  The first reflecting surface 914, the second reflecting surface 913, and the connecting surface 915 are side surfaces 916 opposite to the emitting surface 912 among the side surfaces of the first light guide portions 91F and 91B (FIG. 2, 3 (see broken lines in FIGS. 3 and 6). The first reflecting surface 914, the second reflecting surface 913, and the connecting surface 915 are from one end portion to the other end portion of the first light guide portions 91F and 91B, that is, the longitudinal direction of the second light guide portion 92. Many are provided alternately and continuously over almost the entire direction O2. In this example, the widths of the first reflecting surface 914, the second reflecting surface 913, and the connecting surface 915 are about 2 mm.

  The first reflecting surface 914, the second reflecting surface 913, and the connecting surface 915 are both end portions of the first light guide portions 91F and 91B, and are located at portions from the incident surfaces 910 and 911 to the distance start point S. Is not provided. Portions from the incident surfaces 910 and 911 to the distance start point S are non-light emitting portions where the emitted lights L11 and L21 are not emitted from the emitting surface 912. Portions from the incident surfaces 910 and 911 to the distance start point S are covered with the inner panel 5.

  On the side surfaces of the two first light guide portions 91F and 91B other than the emission surface 912, the first reflection surface 914, the second reflection surface 913, and the connecting surface 915, the second light guide portion 92 is provided. Both side surfaces of the longitudinal direction O2 are integrally connected.

(Description of the first reflecting surface 914)
The first reflective surface 914 is a bottom surface recessed from the side surface 916 into the first light guides 91F and 91B, and is provided in parallel or substantially parallel to the longitudinal direction O1 of the first light guides 91F and 91B. It has been.

  The first reflecting surface 914 includes one incident light (hereinafter referred to as “first incident light”) incident on the first light guide portions 91F and 91B from the first light source 80 through the first incident surface 910. L10, and the other incident light (hereinafter referred to as “second incident light”) L20 incident from the second light source 81 through the second incident surface 911 into the first light guide portions 91F and 91B. Are totally reflected in the first light guides 91F and 91B and the second light guide 92, respectively.

  The depth of the first reflecting surface 914, that is, the length of the perpendicular line from the side surface 916 to the first reflecting surface 914 of the first light guides 91F and 91B is the incident surface from the incident surfaces 910 and 911 side. It gradually changes so as to increase as it goes to the opposite side to the surfaces 910 and 911 (as it goes away from the incident surfaces 910 and 911).

  In this example, the depth of the first reflecting surface 914 at a location separated from the incident surfaces 910 and 911 by the distance start point S is about 1 to 1 with respect to the diameter Φ of the first light guide portions 91F and 91B. 3%. On the other hand, the depth of the first reflecting surface 914 at a position separated from the incident surfaces 910 and 911 by the distance end point E is about 2 with respect to the diameter Φ of the first light guide portions 91F and 91B. ~ 4%. In this example, the gradual change rate of the depth of the first reflecting surface 914 is linear or almost linear.

  That is, as shown in FIGS. 2 and 3, the depths T1, T2, and T3 of the first reflecting surface 914 go from the first incident surface 910 side to the opposite side to the first incident surface 910. It gradually changes so as to increase (T1 <T2 <T3). 2 and 3, the depths T1, T2, and T3 of the first reflecting surface 914 are shown larger than the actual depth. A solid line arrow L10 in FIG. 2 indicates a direction in which the first incident light L10 is guided in the first light guides 91F and 91B.

  Here, the symbol “T1” indicates the depth of the first reflecting surface 914 in the vicinity of the location separated from the first incident surface 910 by the distance starting point S. The symbol “T3” indicates the depth of the first reflecting surface 914 in the vicinity of the location separated from the first incident surface 910 by the distance end point E. The symbol “T2” indicates the depth of the first reflecting surface 914 in the vicinity of one half of the distance obtained by subtracting the distance start point S from the distance end point E.

  2 and 3, the depths T1, T2, and T3 of the first reflecting surface 914 with respect to the first incident surface 910 are shown. The depth of the first reflective surface 914 with respect to the second incident surface 911 is also the same depth as the depths T1, T2, and T3 of the first reflective surface 914 with respect to the first incident surface 910. That's what it is.

  The gradual change rates of the depths T1, T2, and T3 of the first reflecting surface 914 are smaller as the curvature radii of the first light guide portions 91F and 91B are larger. That is, the gradual change rate of the depths T1, T2, and T3 of the first reflective surface 914 of the front first light guide 91F is the depth of the first reflective surface 914 of the rear first light guide 91B. It is larger than the gradual change rate of T1, T2, and T3.

(Description of the second reflecting surface 913 and the connecting surface 915)
The second reflection surface 913 is provided in the first light guide portions 91F and 91B from the first reflection surface 914 so as to be inclined with respect to the longitudinal direction O1 of the first light guide portions 91F and 91B. . A large number of the first reflecting surfaces 914 and the second reflecting surfaces 913 are provided continuously in the longitudinal direction O1 of the first light guide portions 91F and 91B via the connecting surface 915. That is, the second reflecting surface 913 and the connecting surface 915 are connected to the longitudinal direction O1 of the first light guide portions 91F and 91B from both ends of the first reflection surface 914 into the first light guide portions 91F and 91B. It is inclined with respect to. The second reflecting surface 913 and the connecting surface 915 are composed of two surfaces of a V-shaped or substantially V-shaped prism.

  As shown in FIG. 11A, the second reflecting surface 913 reflects the first incident light L10 with the first incident surface 910 as a reference to the exit surface 912 side as reflected light L12. . On the other hand, as shown in FIG. 11 (B), the connecting surface 915 reflects the second incident light L20 with the second incident surface 911 as a reference as reflected light L22 toward the emission surface 912 side. . As described above, in the case of the second incident light L20, the connecting surface 915 serves as a second reflecting surface, and the second reflecting surface 913 serves as a connecting surface. For this reason, hereinafter, the second reflecting surface 913 may include the connecting surface 915 in the case of the second incident light L20, and the connecting surface 915 may be the same as that in the case of the second incident light L20. The second reflecting surface 913 may also be included.

  The height of the second reflecting surface 913, that is, the length of the perpendicular from the side surface 916 of the first light guides 91F and 91B to the intersecting line of the second reflecting surface 913 and the connecting surface 915 is The distance increases from the incident surfaces 910 and 911 toward the opposite side to the incident surfaces 910 and 911 (as the distance from the incident surfaces 910 and 911 increases). For example, it gradually changes so as to increase in a curve.

  In this example, the height of the second reflecting surface 913 at a location separated from the incident surfaces 910 and 911 by the distance start point S is about 4 to about the diameter Φ of the first light guide portions 91F and 91B. 6%. On the other hand, the height of the second reflecting surface 913 at a location separated from the incident surfaces 910 and 911 by the distance end point E is about 18 with respect to the diameter Φ of the first light guide portions 91F and 91B. ~ 22%. In this example, the gradual change rate of the height of the second reflecting surface 913 is exponential or almost exponential as shown in FIG.

  That is, as shown in FIGS. 2, 3, and 4, the heights H1, H2, and H3 of the second reflecting surface 913 are opposite to the first incident surface 910 from the first incident surface 910 side. It gradually changes so as to increase as it goes to (H1 <H2 <H3). 2 and 3, the heights H1, H2, and H3 of the second reflecting surface 913 are shown larger than the actual height.

  Here, the symbol “H1” is the height of the second reflecting surface 913 in the vicinity of the location separated from the first incident surface 910 by the distance start point S, and indicates the minimum height. The symbol “H3” is the height of the second reflecting surface 913 in the vicinity of the location separated from the first incident surface 910 by the distance end point E, and indicates the maximum height. The symbol “H2” indicates the height of the second reflecting surface 913 in the vicinity of one half of the distance obtained by subtracting the distance start point S from the distance end point E.

  2 and 3, the heights H1, H2, and H3 of the second reflecting surface 913 with respect to the first incident surface 910 are shown. The height of the second reflecting surface 913 with respect to the second incident surface 911 is also the same height as the heights H1, H2, and H3 of the second reflecting surface 913 with respect to the first incident surface 910. That's what it is.

  The gradual change rates of the heights H1, H2, and H3 of the second reflecting surface 913 are smaller as the curvature radii of the first light guide portions 91F and 91B are larger. That is, as shown in FIG. 4, the gradual change rates of the heights H1, H2, and H3 of the second reflective surface 913 of the front first light guide 91F are the same as those of the rear first light guide 91B. The rate of gradual change of the heights H1, H2, and H3 of the two reflecting surfaces 913 is larger.

  The heights H1, H2, and H3 of the second reflecting surface 913 are based on the diameter Φ of the first light guide portions 91F and 91B. For example, when the diameter Φ of the first light guides 91F and 91B is about 6 mm, the maximum height H3 of the second reflecting surface 913 is about 1.2 mm. In this case, the distance end point E from the incident surfaces 910 and 911 is about 500 to about 550 mm, and the total length of the first light guide portions 91F and 91B is about 1,000 to about 1,100 mm, which is twice as large. is there.

  In addition, when the diameter Φ of the first light guides 91F and 91B is about 8 mm, the maximum height H3 of the second reflecting surface 913 is about 1.6 mm. In this case, the distance end point E from the incident surfaces 910 and 911 is about 650 to about 700 mm, and the total length of the first light guide portions 91F and 91B is about 1,300 to about 1,400 mm, which is twice as large. is there.

  Further, when the diameter Φ of the first light guides 91F and 91B is about 10 mm, the maximum height H3 of the second reflecting surface 913 is about 2 mm. In this case, the distance end point E from the incident surfaces 910 and 911 is about 800 to about 850 mm, and the total length of the first light guide portions 91F and 91B is about 1,600 to about 1,700 mm, which is doubled. is there.

(Description of the second light guide 92)
The second light guide 92 includes the emission surface 922 and the reflection surface 923.

  The exit surface 922 is provided on the surface of the second light guide 92 that faces the lamp lens 3 and the inner lens 4. A plurality of diffusion prisms 924 having a triangular cross section are provided on the emission surface 922 along the longitudinal direction O2. The diffusing prism 924 may be a plurality of arc-shaped prisms formed along the second light guide portion 92 having a circular arc cross section and having a plate shape. The exit surface 922 is the incident light L10, L20, and the reflected light L32 from the reflection surface 923 is used as the exit light L31 from the second light guide portion 92 to the outside in the optical axis direction Z or substantially the light. The light is emitted along the axial direction Z. The diffusion prism 924 diffuses the emitted light L31 emitted from the emission surface 922 to the outside.

  The reflection surface 923 is provided on a surface of the second light guide 92 that is opposite to the emission surface 922. The reflection surface 923 is provided with a diffusing element group (not shown) that diffuses the reflected light L32, such as a texture. The reflection surface 923 is the incident light L10 and L20, and a part of the light guided from the first light guides 91F and 91B into the second light guide 92 is used as the reflected light L32. The light is diffusely reflected toward the emission surface 922 side. In addition, the reflection surface 923 transmits part of the light guided from the first light guides 91F and 91B into the second light guide 92 and the first light guides 91F and 91B and the second light guides. The light is diffusely reflected in the light portion 92.

(Description of the operation of the embodiment)
A light guide 9 that is a vehicle light guide according to this embodiment and a vehicle lamp 1 according to this embodiment (hereinafter referred to as “light guide 9 according to this embodiment, vehicle lamp 1”) are as follows: The configuration as described above will be described below.

  The light emitting units of the two first light sources 80 and the light emitting units of the two second light sources 81 are respectively turned on. Then, the light emitted from the light sources 80 and 81 enters the two first light guide portions 91F and 91B from the first incident surface 910 and the second incident surface 911 of the two first light guide portions 91F and 91. Incident lights L10 and L20 are respectively incident. Among the incident lights L10 and L20, the first incident light L10 repeats total reflection in the two first light guide portions 91F and 91B from the first incident surface 910 side to the second incident surface 911 side. Led. Of the incident lights L10 and L20, the second incident light L20 repeatedly undergoes total reflection in the two first light guides 91F and 91B from the second incident surface 911 side to the first incident surface 910 side. While being guided.

  Part of the incident light L10 and L20 in the first light guides 91F and 91B is reflected by the second reflection surface 913 and the connection surface 915 of the first light guides 91F and 91B. The reflected lights L12 and L22 are emitted to the outside along the optical axis direction Z or substantially in the optical axis direction Z from the emission surfaces 912 of the first light guides 91F and 91B as emission lights L11 and L21.

  In addition, part of the incident light L10 and L20 in the first light guides 91F and 91B is the first reflection surface 914 of the first light guides 91F and 91B, and in the first light guides 91F and 91B and the second. The light is totally reflected in the light guide unit 92. The reflected light (incident light L10, L20) totally reflected in the first light guides 91F, 91B is further guided in the first light guides 91F, 91B.

  On the other hand, the reflected light (incident light L <b> 10, L <b> 20) totally reflected in the second light guide unit 92 is guided in the second light guide unit 92. A part of the light (incident light L10, L20) guided from the first light guides 91F and 91B into the second light guide 92 is reflected by the reflection surface 923 of the second light guide 92. The reflected light L32 is emitted to the outside from the emission surface 922 of the second light guide 92 as the emitted light L31 along the optical axis direction Z or substantially the optical axis direction Z. A part of the emitted light L31 is diffused by the diffusion prism 924 on the emission surface 922 of the second light guide 92.

  Further, a part of the light (incident light L10, L20) guided from the first light guides 91F and 91B into the second light guide 92 is part of the first light guides 91F and 91B and the second light guide. The portion 92 is guided from the first incident surface 910 side to the second incident surface 911 side and from the second incident surface 911 side to the first incident surface 910 side.

  The emitted lights L11 and L21 emitted to the outside from the emission surfaces 912 of the first light guide portions 91F and 91B and the emitted light L31 emitted to the outside from the emission surfaces 922 of the second light guide portion 92 are transmitted through the inner lens 4. While spreading. The diffused emitted lights L11, L21, and L31 are emitted from the lamp lens 3 to the front of the vehicle in a predetermined light distribution pattern.

  That is, the light distribution pattern of the clearance lamp is formed by the emitted lights L11 and L21 emitted from the emission surfaces 912 of the two first light guides 91F and 91B. A predetermined light distribution pattern is formed between the emission surfaces 912 of the two first light guide portions 91F and 91B by the emitted light L31 emitted from the emission surface 922 of the second light guide portion 92.

(Explanation of effect of embodiment)
The light guide 9 and the vehicular lamp 1 according to this embodiment are configured and operated as described above, and the effects thereof will be described below.

  In the light guide 9 and the vehicular lamp 1 according to this embodiment, light (incident light L10, L20) incident on the light guide 9 is transmitted through the second reflection surface 913 (second reflection surface 913, connection surface 915). Light that is reflected and emitted to the outside from the emission surface 912 and incident on the light guide 9 (incident light L10 and L20) is reflected by the first reflection surface 914 and opposite to the incidence surfaces 910 and 911. Led to. For this reason, in the light guide 9 and the vehicle lamp 1 according to this embodiment, the heights H1, H2, and H3 of the second reflecting surface 913 are opposite to the incident surfaces 910 and 911 from the incident surfaces 910 and 911 side. It gradually changes so as to increase in a curve as it goes to the side, and the depths T1, T2, and T3 of the first reflecting surface 914 go from the incident surfaces 910 and 911 to the opposite side to the incident surfaces 910 and 911. The amount of light (flux) emitted from the exit surface 912 can be made uniform or substantially uniform from the entrance surface 910, 911 side to the opposite side to the entrance surface 910, 911 by gradually changing so as to increase. it can. As a result, the light guide 9 and the vehicular lamp 1 according to this embodiment can improve the uniform light emission of the emission surfaces 912 of the first light guide portions 91F and 91B of the light guide 9 having a rod shape.

  In particular, the light guide 9 and the vehicular lamp 1 according to this embodiment include heights H1, H2, and H3 of the second reflecting surfaces 913 of the two first light guide portions 91F and 91B as shown in FIG. Increases from the incident surfaces 910 and 911 toward the opposite side of the incident surfaces 910 and 911. That is, in this example, the curve gradually changes so as to increase exponentially. On the other hand, as shown in FIG. 5, the light beams of the incident lights L10 and L20 in the two first light guides 91F and 91B go from the incident surfaces 910 and 911 to the opposite sides with respect to the incident surfaces 910 and 911. Decrease. In other words, it is exponentially smaller in this example. As described above, the light guide 9 and the vehicle lamp 1 according to this embodiment include the two first light guides accompanying the attenuation of the incident lights L10 and L20 in the two first light guide portions 91F and 91B. It is possible to increase the amount (light flux) of the outgoing lights L11 and L21 that are reflected by the second reflecting surface 913 (second reflecting surface 913, connecting surface 915) of the light portions 91F and 91B and exit from the exit surface 912 to the outside. . As a result, the light guide 9 and the vehicular lamp 1 according to this embodiment can further improve the uniform light emission of the exit surfaces 912 of the two first light guide portions 91F and 91B having a bar shape.

  Moreover, in the light guide 9 and the vehicular lamp 1 according to this embodiment, the depths T1, T2, and T3 of the first reflecting surface 914 are on the opposite side from the incident surfaces 910 and 911 with respect to the incident surfaces 910 and 911. In this example, it gradually changes so as to increase linearly as it goes. For this reason, since the light guide 9 and the vehicle lamp 1 according to this embodiment can guide the incident lights L10 and L20 in the two first light guide portions 91F and 91B as far as possible, The uniform light emission of the emission surfaces 912 of the two first light guide portions 91F and 91B having a bar shape can be improved.

  Hereinafter, the effect of gradually changing the depths T1, T2, and T3 of the first reflecting surface 914 will be described with reference to FIG. In addition, what is shown with the continuous line in FIG. 6 is the case of the 1st reflective surface 914 from which depth T1, T2, T3 changes gradually. On the other hand, what is indicated by a broken line in FIG. 6 is the case of the first reflecting surface 914 whose depth does not gradually change.

  As shown in FIG. 6, the length W1 in the longitudinal direction O1 of the first reflecting surface 914 that gradually changes is longer than the length W2 in the longitudinal direction O1 of the first reflecting surface 914 that does not gradually change. For this reason, the length W3 of the second reflecting surface 913 provided from the first reflecting surface 914 that gradually changes is equal to the length W4 of the second reflecting surface 913 provided from the first reflecting surface 914 that does not change gradually. Shorter than.

  Thus, the amount of light (flux) reflected by the gradually changing first reflecting surface 914 is larger than the amount of light (flux) reflected by the first reflecting surface 914 that does not gradually change. On the other hand, the amount (light beam) of light reflected by the second reflecting surface 913 provided from the gradually changing first reflecting surface 914 is the second reflecting surface 913 provided from the first reflecting surface 914 that does not change gradually. Less than the amount of light reflected by the light beam.

  As a result, when it is not gradually changed, on the incident surface side, the second reflecting surface 913 emits a lot of light as the outgoing light, and the first reflecting surface 914 guides a small amount of light to the back. On the other hand, in the case of gradual change, on the incident surface side, a small amount of light is emitted as outgoing light on the second reflective surface 913, and a large amount of light is guided deeply on the first reflective surface 914. As described above, by gradually changing the depths T1, T2, and T3 of the first reflecting surface 914, the incident lights L10 and L20 in the two first light guide portions 91F and 91B can be guided as far as possible. In addition, the uniform light emission of the emission surfaces 912 of the two first light guide portions 91F and 91B having a long bar shape can be improved.

  In the light guide 9 and the vehicle lamp 1 according to this embodiment, the two first light guide portions 91F and 91B have a curved shape, and the second reflection of the two first light guide portions 91F and 91B. The gradual change rates of the heights H1, H2, and H3 of the surface 913 and the gradual change rates of the depths T1, T2, and T3 of the first reflecting surface 914 are the two first light guide portions 91F and 91B of the light guide 9. The larger the radius of curvature, the smaller. That is, as shown in FIG. 4, the gradual change rates of the heights H1, H2, and H3 of the second reflective surface 913 of the front first light guide 91F are the second reflective surfaces 913 of the rear first light guide 91B. It is larger than the gradual change rate of the heights H1, H2, and H3. In addition, the gradual change rates of the depths T1, T2, and T3 of the first reflecting surface 914 of the front first light guide unit 91F are the depths T1, T2, and the depths of the first reflecting surface 914 of the rear first light guide unit 91B. It is larger than the gradual change rate of T3. As a result, the light guide 9 and the vehicular lamp 1 according to this embodiment have the uniform light emission of the emission surface 912 of the front first light guide unit 91F with a small curvature radius and the rear first light guide unit with a large curvature radius. The uniform light emission of the exit surface 912 of 91B can be equivalent or substantially equivalent, and the light emission appearance is improved.

  That is, in the front first light guide 91F having a small radius of curvature, the amounts (light fluxes) of incident light L10 and L20 remaining in the front first light guide 91F are small. On the other hand, in the rear first light guide 91B having a large radius of curvature, the amount of incident light L10 and L20 (light flux) remaining in the rear first light guide 91B is large. For this reason, the gradual change rate of the front first light guide part 91F having a small curvature radius and the gradual change rate of the rear first light guide part 91B having a large curvature radius are made the same. Then, the amount (light flux) of the emitted lights L11 and L21 emitted from the emission surface 912 is incident on the front first light guide 91F having a small radius of curvature, compared to the rear first light guide 91B having a large radius of curvature. Increasing from the surfaces 910 and 911 toward the opposite side of the incident surfaces 910 and 911 (as moving away from the incident surfaces 910 and 911).

  Therefore, in the light guide 9 and the vehicle lamp 1 according to this embodiment, the gradual change rate of the front first light guide unit 91F having a small curvature radius is set to the gradual change rate of the rear first light guide unit 91B having a large curvature radius. Larger than. Thereby, the light guide 9 and the vehicle lamp 1 according to this embodiment are configured to uniformly emit light from the emission surface 912 of the front first light guide unit 91F having a small curvature radius and the rear first light guide unit having a large curvature radius. The uniform light emission of the exit surface 912 of 91B can be equivalent or substantially equivalent, and the light emission appearance is improved.

  The light guide body 9 and the vehicle lamp 1 according to this embodiment include first light guide portions 91F and 91B as two light guide bodies having a bar shape, and two first light guide portions 91F having a bar shape. A second light guide part 92 as an additional light guide having a plate shape provided between side surfaces other than the emission surface 912 of 91B, the first reflection surface 914, the second reflection surface 913, and the connection surface 915; It is comprised from. For this reason, the light guide body 9 and the vehicle lamp 1 according to this embodiment have a predetermined light distribution pattern, in this example, a light distribution pattern of a clearance lamp, by the two first light guide portions 91F and 91B. Since the predetermined light distribution pattern is obtained by the second light guide unit 92, the visibility from a pedestrian is improved, which can contribute to traffic safety.

  In the light guide 9 and the vehicle lamp 1 according to this embodiment, the two first light guide portions 91F and 91B have a bar shape. As a result, in the light guide 9 and the vehicle lamp 1 according to this embodiment, the first incident light L10 from the first light source 80 is transferred from the first incident surface 910 to the second incident surface 911, and the second light source. The second incident light L20 from 81 can be efficiently guided from the second incident surface 911 to the first incident surface 910 side. A part of the first incident light L10 and a part of the second incident light L20 are emitted to the outside as emission lights L11 and L21 from the emission surfaces 912 of the two first light guides 91F and 91B.

  Further, in the light guide 9 and the vehicle lamp 1 according to this embodiment, the single second light guide portion 92 has a plate shape. As a result, the light guide body 9 and the vehicular lamp 1 according to this embodiment include the first incident light L10 and the first incident light L10 guided from the two first light guide portions 91F and 91B into the second light guide portion 92. The two incident lights L20 can be emitted to the outside as the emitted light L31 over almost the entire surface. Part of the first incident light L10 and the second incident light L20 guided into the second light guide 92 from the two first light guides 91F and 91B is from the second light guide 92. It is guided into the first light guides 91F and 91B.

  The light guide 9 according to this embodiment has a complicatedly long shape in three dimensions along the design surface of the lamp lens 3 constituted by a three-dimensional curved surface. As a result, the light guide 9 and the vehicular lamp 1 according to this embodiment are optimal as a clearance lamp for a front combination lamp.

(Description of example other than embodiment)
In the above embodiment, the clearance lamp of the front combination lamp will be described. However, in the present invention, a vehicle lamp other than the clearance lamp of the front combination lamp, for example, a daytime running lamp of the front combination lamp, a turn signal lamp, a cornering lamp, a fog lamp, a turn signal lamp of the rear combination lamp, a tail lamp, and a stop lamp. It can also be applied to lamps, tail / stop lamps, backup lamps, etc.

  Moreover, in the said embodiment, the diameter of the 1st light guide parts 91F and 91B of the light guide 9 is about 6-10 mm, and the width | variety of the 1st reflective surface 914, the 2nd reflective surface 913, and the connection surface 915 is the same. About 2 mm. However, in the present invention, the diameter dimensions of the first light guide portions 91F and 91B of the light guide 9 and the width dimensions of the first reflecting surface 914, the second reflecting surface 913, and the connecting surface 915 are not particularly limited.

  Further, in the above-described embodiment, the light guide 9 has a three-dimensionally complicated shape along the design surface of the lamp lens 3 constituted by a three-dimensional curved surface. However, in the present invention, the shape of the light guide 9 is not particularly limited. For example, the shape of the light guide 9 may be a three-dimensional shape and not along the design surface of the lamp lens 3.

  Furthermore, in the above-described embodiment, the lamp lens 3 is constituted by a plain lens. However, in the present invention, the lamp lens 3 may be provided with a diffusion system prism such as a fish-eye prism.

  Furthermore, in the above-described embodiment, the incident surfaces 910 and 911 are respectively provided on both end surfaces of the two first light guide portions 91F and 91B, and the light sources 80 and 81 are disposed on the incident surfaces 910 and 911, respectively. To do. However, in the present invention, an incident surface may be provided on one end surface of the first light guides 91F and 91B, and a light source may be disposed on the incident surface. Moreover, in this invention, an incident surface may be provided in the both end surfaces or one end surface of the 2nd light guide part 92, and a light source may be arrange | positioned in the incident surface.

  Furthermore, in the above-described embodiment, the light guide 9 is composed of two first light guide portions 91F and 91B and one second light guide portion 92. However, in the present invention, the light guide 9 is composed of one first light guide, or one composed of one first light guide and one second light guide, or One consisting of one first light guide part and two second light guide parts, one consisting of three or more first light guide parts and one second light guide part, or It consists of one first light guide and three or more second light guides, or consists of two or more first light guides and two or more second light guides. May be.

  Furthermore, in the above-described embodiment, as the light sources 80 and 81, self-luminous semiconductor light sources such as LEDs, OELs, and OLEDs are used. However, in the present invention, the light source may be a bulb light source or a laser device that emits laser light.

  Furthermore, in the above-described embodiment, the outgoing lights L11, L21, and L31 transmitted from the inner lens 4 are diffused by the inner lens 4. However, in the present invention, the outgoing lights L11, L21 and L31 transmitted from the inner lens 4 may be transmitted as they are without being diffused.

  Furthermore, in the above embodiment, the inner lens 4 is used. However, in the present invention, the inner lens 4 need not be used.

DESCRIPTION OF SYMBOLS 1 Vehicle lamp 2 Lamp housing 3 Lamp lens 4 Inner lens 5 Inner panel 6 Head lamp unit 7 Turn signal lamp unit 80 1st light source (light source)
81 Second light source (light source)
9 light guide 91F front 1st light guide part (1st light guide part)
91B Rear first light guide (first light guide)
910 First entrance surface (incident surface)
911 Second entrance surface (incident surface)
912 exit surface 913 second reflecting surface 914 first reflecting surface 915 connecting surface 916 side surface
92 2nd light guide part 922 Output surface 923 Reflective surface 924 Diffusion prism 10 Lamp chamber L10 1st incident light (incident light)
L20 Second incident light (incident light)
L11, L21, L31 Emitted light L12, L22, L32 Reflected light O Outer side I Inside U Upper side D Lower side F Front side B Rear side Z Optical axis direction O1, O2 Longitudinal direction H1, H2, H3 Height T1, T2, T3 depth S Distance start point E Distance end point W1, W2, W3, W4 Length Φ Diameter

Claims (5)

A light guide having a rod shape,
An incident surface provided on an end surface of the light guide to allow light to enter the light guide from outside;
An exit surface that is provided on a side surface of the light guide and emits light incident on the light guide to the outside from the light guide;
A reflective surface that is provided on a side surface opposite to the light exit surface of the light guide and reflects light incident on the light guide into the light guide;
With
The reflective surface is
A first reflecting surface that is a bottom surface recessed from the side surface of the light guide body into the light guide body and is provided in parallel or substantially parallel to the longitudinal direction of the light guide body;
A second reflecting surface provided at an angle with respect to the longitudinal direction of the light guide in the light guide from the first reflecting surface;
Have
A plurality of the first reflection surface and the second reflection surface are continuously provided in the longitudinal direction of the light guide through the connection surface,
The length of the perpendicular line from the side surface of the light guide to the intersection of the second reflecting surface and the connecting surface is from the incident surface side to the incident surface. As we go to the other side, it gradually changes to increase,
The depth of the first reflecting surface and the length of the perpendicular from the side surface of the light guide to the first reflecting surface increases from the incident surface side to the opposite side to the incident surface. Is gradually changing,
A light guide for a vehicle characterized by the above. The light guide has a curved shape,
The gradual change rate of the height of the second reflective surface and the gradual change rate of the depth of the first reflective surface are smaller as the curvature radius of the light guide is larger,
The light guide for vehicles according to claim 1 characterized by things. A plurality of the light guides;
An additional light guide having a plate shape provided between side surfaces other than the exit surface and the reflection surface of the plurality of light guides;
Composed of,
The light guide for vehicles according to claim 1 or 2 characterized by things. A lamp housing and a lamp lens that partition the lamp chamber;
The light guide for vehicles according to any one of claims 1 to 3, wherein light from the light source disposed in the lamp chamber and light from the light source enter.
With
A vehicular lamp characterized by the above. In the lamp chamber, a plurality of the light guide bodies having a curved shape are arranged back and forth in the optical axis direction,
The curvature radius of the light guide on the front side in the optical axis direction is smaller than the curvature radius of the light guide on the rear side in the optical axis direction,
The gradual change rate of the height of the second reflecting surface of the light guide on the front side in the optical axis direction and the gradual change rate of the depth of the first reflective surface are the light guides on the rear side in the optical axis direction. Greater than the gradual change rate of the height of the second reflective surface of the body and the gradual change rate of the depth of the first reflective surface;
The vehicular lamp according to claim 4.

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