JP2020061204A - Vehicular lighting tool - Google Patents

Abstract

To provide a vehicular lighting tool capable of increasing an area of an emission surface without enlarging it.SOLUTION: A vehicular lighting tool 10 includes: a light source 21; and a light guiding body 22 which guides and emits light from the light source 21. The light guiding body 22 has an emission surface 41 for emitting the guided light to the outside, and a reflection surface (44) which reflects the incident light from the light source 21 toward the emission surface 41. The emission surface 41 has a first emission place 45 where the light directly guided by being reflected on the reflection surface is emitted, and a second emission place 46 which is configured by a surface expanded on the same plane as the first emission place 45.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a vehicle lamp.

  Some vehicular lamps allow light from a light source to be guided by a light guide so that the light can be emitted at any position and shape. In such a vehicle lamp, the light guide body is provided with an emission surface (a ring-shaped protrusion 14B3) and a reflection surface (a ring-shaped reflection element 14B1) that reflects light from the light source toward the emission surface. Are considered (for example, refer to Patent Document 1 and the like). In this vehicular lamp, the emission surface and the reflection surface have the same area when viewed on a plane orthogonal to the traveling direction of the light toward the emission surface, so that the emission surface is evenly illuminated.

JP, 2005-203111, A

  However, in the conventional vehicle lamp, if the area of the emission surface is increased in order to increase the area of light emission, it is necessary to increase the area of the reflection surface seen on the above-mentioned surface, and the overall size increases. I will end up.

  The present disclosure has been made in view of the above circumstances, and an object of the present disclosure is to provide a vehicular lamp that can increase the area of the emission surface without increasing the size.

  The vehicular lamp of the present disclosure includes a light source and a light guide body that guides and emits light from the light source, and the light guide body has an emitting surface that emits the guided light to the outside. A reflecting surface that reflects light from the light source toward the emitting surface, the emitting surface emitting a light directly guided by being reflected by the reflecting surface; And a second emission point composed of an enlarged surface on the same plane as the first emission point.

  According to the vehicular lamp of the present disclosure, the area of the emission surface can be increased without increasing the size.

It is an explanatory view showing composition of an example vehicle lamp concerning one embodiment of a vehicle lamp concerning this indication. It is sectional drawing of the light guide obtained along the II line shown in FIG. It is explanatory drawing which shows the structure of the right side wall part in the light guide of FIG. FIG. 5 is an explanatory view similar to FIG. 1, showing a vehicle light fixture of a light guide body according to a second embodiment. FIG. 6 is an explanatory view similar to FIG. 3 showing a side wall portion of a light guide body of Example 2.

  Hereinafter, each example of the vehicle lamp 10 as one embodiment of the vehicle lamp according to the present disclosure will be described with reference to FIGS. 1 to 5. In addition, in FIG. 1, dots are shown at positions corresponding to the respective emission surfaces (411, 412, 413). Further, in FIG. 3 and FIG. 5, the second emission point 46 and the like are emphasized and shown in a simplified manner as a whole in order to facilitate understanding of the configurations of the light guides 22 and 22A. Does not match the configuration of.

  The vehicle lamp 10 is used for a position lamp, a tail lamp, a stop lamp, a turn lamp, a combination lamp, etc. as a lamp of a vehicle such as an automobile. In the first embodiment, as shown in FIGS. The example used for is shown below. The vehicular lamp 10 forms a lamp chamber 13 on both left and right sides of a rear part of a vehicle, with a lamp housing 11 having a front end opened and an outer lens 12 covering the opening (see FIG. 2). The lamp housing 11 has a hollow shape with one end open and the other closed, and constitutes a mounting location of the lamp unit 20 and accommodates a lighting drive device for controlling lighting thereof.

  In the vehicle lamp 10, the lamp unit 20 is provided in the lamp chamber 13. The lamp unit 20 includes a light source 21 (see FIG. 2) and a light guide 22. The lamp unit 20 causes the light emitted from the light source 21 to enter the light guide body 22, and the light guide body 22 emits the light to each emission surface (411, 412, 413) described below provided on the front side in the irradiation direction. By guiding and emitting, each emission surface is made to shine. In the following description, in the vehicular lamp 10, the irradiation direction (front side) is the direction behind the traveling direction when the vehicle is straight ahead and the light is emitted from the lamp unit 20. The vertical direction is the vertical direction, and the direction orthogonal to the irradiation direction and the vertical direction is the width direction.

  The light source 21 includes a light emitting element such as an LED (Light Emitting Diode) and is mounted on the substrate 23. The light source 21 of the first embodiment is provided with the optical axis Ae (see FIG. 2) substantially aligned with the irradiation direction. The substrate 23 can appropriately supply the power from the lighting control circuit to the light source 21, and turns on the light source 21. The light source 21 may be composed of a plurality of light emitting elements and is not limited to the structure of the first embodiment.

  The light guide 22 is made of a transparent resin material that allows light to pass therethrough, and is made of an acrylic resin in the first embodiment. The light guide 22 has a hollow shape with one end open and the other end closed, and surrounds the back wall 30 and the back wall 30 that configure the closed other end of the light guide 22. And a side wall portion 40 projecting to the front side in the irradiation direction. Here, the back wall portion 30 and the side wall portion 40 are integrally formed and have no boundary, but in FIG. 2 and FIG. 4, the boundary portions thereof are shown by chain double-dashed lines. The light guide 22 of the first embodiment has a rectangular shape when viewed from the front side in the irradiation direction, the back wall portion 30 has a rectangular shape when viewed from the front side in the irradiation direction, and the top, bottom, left, and right sides of the back wall portion 30 are four. Four sidewalls 40 are supposed to rise from one end (see FIG. 1). Each side wall portion 40 is inclined so that the leading end 40b side standing up from the side wall base portion 40a side continuous to the back wall portion 30 is separated from the optical axis Ae, and the light guide 22 becomes closer to the front side in the irradiation direction. The opening area of is gradually increased.

  The back wall portion 30 is provided so as to extend in a direction intersecting the optical axis Ae of the light source 21 on the front side in the irradiation direction of the light source 21, and in the first embodiment, extends in a substantially orthogonal direction. The inner panel 14 is provided on the back wall portion 30 via a mounting protrusion 31. When viewed from the front side in the irradiation direction, the inner panel 14 has a rectangular shape along an inner side surface 42 (a third inner side surface 423 described later) on the inner side in the width direction of the side wall portion 40 (a side closer to the optical axis Ae) (FIG. 1). ), The interior wall 30 of the light guide 22 is hidden to enhance the design of the vehicular lamp 10.

  The rear wall portion 30 has an incident surface 32 on which the light from the light source 21 is incident, and a rear wall reflecting surface 33 that reflects the incident light toward each side wall portion 40. The incident surface 32 is a flat surface orthogonal to the optical axis Ae of the light source 21, and the light from the light source 21 is incident on it. The back wall reflection surface 33 is provided on the opposite side of the back wall portion 30 from the incident surface 32, and uses the total reflection to reflect the light incident on the back wall portion 30 to the side wall portion 40 (side wall reflection to be described later). The angle is set (optically designed) so as to proceed toward the surface 44) (see arrows L1, L2, L3 in FIG. 3). The back wall reflecting surface 33 of the first embodiment has four side wall portions 40 standing upright from the four upper, lower, left, and right end portions of the back wall portion 30, so that the back, top, bottom, left, right, and centered around the optical axis Ae. Are provided on the optical axis Ae, and each of them is inclined so as to separate from the optical axis Ae toward the front side in the irradiation direction with the optical axis Ae as the center. Therefore, the back wall portion 30 advances the light from the light source 21 toward each of the four side wall portions 40 by reflecting the light from the corresponding back wall reflecting surface 33. The back wall reflection surface 33 may be configured to reflect light by adhering aluminum, silver, or the like by vapor deposition, painting, or the like.

  Each of the side wall portions 40 is a portion for emitting the light guided from the back wall portion 30 to the front side in the irradiation direction, and has a plate shape extending to the front side in the irradiation direction. The side wall portions 40 are connected to each other at the four corners of the back wall portion 30 and have a rectangular shape surrounding the back wall portion 30 when viewed from the front side in the irradiation direction (see FIG. 1). Each side wall portion 40 is provided with a plurality of emission surfaces 41 toward the front side in the irradiation direction. Each emission surface 41 is formed as a surface facing the irradiation direction front side of the corresponding side wall portion 40, and has a rectangular shape surrounding the back wall portion 30 in accordance with each side wall portion 40 (see FIG. 1).

  In the light guide 22 of the first embodiment, each of the side wall portions 40 is provided with the three emission surfaces 41, that is, the first emission surface 411, the second emission surface 412, and the third emission surface 413. It is said to be surrounded heavily. The side walls 40 are different in the direction with respect to the optical axis Ae and the design shape, but the basic optical design for guiding the light guided from the back wall 30 to the emission surface 41 and emitting the same is the same. Therefore, the configuration of the side wall portion 40 will be described below with reference to FIG. 3, which is an explanatory diagram schematically showing the side wall portion 40 shown on the right side in FIG. 2.

  The sidewall portion 40 has two step portions (412, 413) formed on the inner side in the width direction. In the side wall portion 40, an end surface on the front side in the irradiation direction, which is located on the outer side in the width direction (the side away from the optical axis Ae), that is, the end surface of the tip end 40b of the side wall portion 40 is the first emission surface 411. Further, in the side wall portion 40, the end face on the front side in the irradiation direction, which constitutes a step portion located inside on the rear side in the irradiation direction, is the second emission surface 412, and inside this, a step portion located on the rear side in the irradiation direction is formed. The end face on the front side in the irradiation direction is a third emission face 413. Accordingly, in the side wall portion 40, the inner side surface 42 on the inner side in the width direction connects the first emission surface 411 and the second emission surface 412 to the first inner side surface 421, the second emission surface 412, and the third emission surface 413. And a third inner side surface 423 that connects the third emission surface 413 and the back wall portion 30 (the front surface 30a thereof). The inner side surfaces (421, 422, 423) are substantially parallel to the outer side surface 43 of the side wall portion 40 on the outer side in the width direction.

  Further, in the side wall portion 40, the side wall base portion 40 a that is continuous with the rear wall portion 30 is provided with the side wall reflective surface 44 at a position facing the rear wall reflective surface 33 of the rear wall portion 30 in the width direction. The side wall reflection surface 44 advances the light guided by the back wall reflection surface 33 toward each emission surface (411, 412, 413) by using total reflection. The side wall reflecting surface 44 is an angle at which the light reflected by the inner wall reflecting surface 33 and directly reaching the side wall reflecting surface 44 is reflected in a direction parallel to the inner side surface 42 and the outer side surface 43 so as to directly reach each emission surface. Is set (optical design) (see arrows L1, L2, L3). Here, to directly reach from one surface to the other surface means to reach from one surface to the other surface without reaching to other surfaces other than the two surfaces. The side wall reflection surface 44 has three emission surfaces (411, 412, 413) when viewed on a plane orthogonal to the traveling direction of the light reflected so as to directly reach each emission surface (see arrows L1, L2, L3). It has the same shape and area as a combination of first emission points 45 described later. The side wall reflecting surface 44 may be configured to reflect light by adhering aluminum, silver, or the like by vapor deposition, painting, or the like.

  Each exit surface (411, 412, 413) has a first exit location 45. Each of the first emission points 45 is a normal emission point that has the same configuration as that of each conventional emission surface and emits normal light as described later. Each of the first emission points 45 emits light (see arrows L1, L2, and L3) that is parallel to the outer surface 43 by the reflection on the sidewall reflection surface 44 and directly reaches each emission surface in a direction along the irradiation direction. As described above, the angle is set (optically designed) in consideration of the refractive index of the light guide 22. The emission surfaces of the first embodiment have the same traveling direction when the light directly reaching the emission surfaces is emitted. In addition, each emission surface of the first embodiment is provided with small rectangular protrusions arranged in an array, and enhances the design from the front side in the irradiation direction and diffuses the emitted light.

  Therefore, in the side wall portion 40, a portion sandwiched between the first inner side surface 421 and the outer side surface 43 and extending from the side wall reflecting surface 44 to the first inner side surface 421 directly reaches the first emitting surface 411 from the side wall reflecting surface 44. It becomes the first optical path P1 through which light passes. Further, in the side wall portion 40, a portion which is sandwiched between the first optical path P1 and the second inner side surface 422 and extends from the side wall reflecting surface 44 to the second inner side surface 422 is a second portion through which the light directly reaching the second emitting surface 412 passes. It becomes the optical path P2. Further, in the side wall portion 40, a portion which is sandwiched between the second optical path P2 and the third inner side surface 423 and extends from the side wall reflecting surface 44 to the third inner side surface 423 is a third portion through which light directly reaching the third emitting surface 413 passes. It becomes the optical path P3. Since the three optical paths (P1, P2, P3) are configured as described above, when viewed on a plane orthogonal to the traveling direction of the light reflected so as to directly reach each emission surface (see arrows L1, L2, L3). The side wall reflecting surface 44 has the same shape and area, and also has the same shape and area as the sum of the first emitting portions 45 of the three emitting surfaces.

  In addition, each emission surface is appropriately provided with the second emission location 46. Each of the second emission points 46 is formed by a surface that is enlarged inward in the width direction on the same plane as the first emission point 45 (enlarged emission point), and in the example of FIG. 2 is provided on the emission surface 412. In the side wall portion 40, the first inner side surface 421 moves from the inner end of the first emission surface 411 (the second emission portion 46) to the second emission surface 412 (the first emission surface thereof) as the second emission portions 46 are provided. The second inner side surface 422 extends from the inner end of the second emission surface 412 (the second emission location 46) to the third emission surface 413 (the first emission location 45). It is assumed that it extends linearly at the outer end of. Of the light reflected by the back wall reflection surface 33, each of the second emission points 46 emits light that is emitted from each of the first emission points 45 and is not subject to optical design (hereinafter referred to as stray light). Let The stray light is mainly reflected by the back wall reflection surface 33 and then reflected (total reflection) by the front surface 30a and the back surface 30b of the back wall portion 30 to reach the side wall reflection surface 44 (see arrow L4). ). The stray light may be any light other than the light that directly travels from the side wall reflection surface 44 to each of the first emission points 45, and is not limited to the above example. The front surface 30a and the back surface 30b of the back wall portion 30 may be made to reflect light by adhering aluminum, silver, or the like by vapor deposition, painting, or the like.

  In the vehicle lamp 10, in the lamp unit 20, electric power from the lighting control circuit is supplied from the substrate 23 to the light source 21 to light the light source 21. Then, the light from the light source 21 travels radially while centering on the optical axis Ae, reaches the incident surface 32, and travels from the incident surface 32 into the inner wall portion 30 of the light guide 22. The light that has traveled into the inner wall portion 30 is totally reflected by the inner wall reflection surface 33 and travels toward the side wall portion 40. A part of the light traveling toward the side wall portion 40 directly reaches the side wall reflecting surface 44, is reflected there, and passes through the three optical paths (P1, P2, P3), and then the first light of each of the emitting surfaces (411, 412, 413). It reaches the emission point 45 and is emitted from the first emission point 45 toward the front side in the irradiation direction (see arrows L1, L2, L3 in FIG. 3). At this time, the vehicle lamp 10 has three emission surfaces when viewed on a plane orthogonal to the traveling direction of the light reflected so as to directly reach each emission surface (the direction parallel to the outer surface 43 in the first embodiment). Since the one obtained by adding the first emission points 45 and the one obtained by adding the side wall reflection surface 44 and the three optical paths have the same shape and area, the first emission points 45 can be evenly illuminated. it can.

  Further, stray light, which is the other part (remaining light) of the light traveling to the side wall portion 40, reaches the side wall reflecting surface 44 in various directions, and after being reflected there, each inner side surface (421, 422, 423) and the outer side surface 43, the light is appropriately totally reflected, reaches the second emission point 46 mainly on the first emission surface 411 and the second emission surface 412, and is emitted from the second emission point 46. At this time, since the side wall portion 40 has an angle set so that the side wall reflecting surface 44 reflects light in a direction parallel to the outer side surface 43, most of the light reaching the outer side surface 43 is completely reflected. It is reflected and does not go out from the outer side surface 43 to the outside of the side wall portion 40. Further, in the side wall portion 40, the first inner side surface 421 and the second inner side surface 422 linearly extend from the outer end of the emission surface 41 on the front side in the irradiation direction to the inner end of the emission surface 41 on the rear side in the irradiation direction. In addition, since the third inner side surface 423 is substantially parallel to the outer side surface 43, most of the light reaching each inner side surface is totally reflected and does not go out of the side wall portion 40 from each inner side surface. . Therefore, the vehicular lamp 10 mainly outputs the stray light that has traveled to the first optical path P1 and the second optical path P2 beyond the third emission surface 413 to each of the first emission surface 411 and the second emission surface 412. The light can be emitted from the place 46, and both the second emission places 46 can be made to shine.

  Thereby, the vehicular lamp 10 uses the light from the single light source 21 to illuminate the respective first emission points 45 of the respective emission surfaces (411, 412, 413) of the lamp unit 20 over the entire circumference. , The second emission points 46 of both emission surfaces (411, 412) are illuminated over the entire circumference (see FIG. 1). At this time, in the vehicular lamp 10, since the inner wall 14 of the light guide 22 is hidden by the inner panel 14 and the inner side surfaces (421, 422, 423) do not illuminate, each emission surface has a triple rectangular shape. It is visually recognized as light of a shape. For this reason, the vehicular lamp 10 can be visually recognized in the vertical direction and the lateral direction on the rear side of the vehicle by illuminating each emission surface, and functions as a stop lamp in the vehicle.

  Here, a conventional vehicle lamp will be described. The conventional vehicular lamp has the same optical design as the vehicular lamp 10 of the present invention, except that the second emission points 46 are not provided on the emission surfaces (411, 412, 413) of the light guide 22. It is said that. Therefore, in order to facilitate understanding, the following description will be given using the same names and reference numerals as those of the vehicle lamp 10. In the conventional vehicular lamp, the second emission points 46 are not provided on the respective emission surfaces of the light guide body 22, and the first emission points 45 only constitute the respective emission surfaces. This conventional vehicular lamp is similar to the vehicular lamp 10 in that three optical paths (P1, P2, P3) are added together when viewed on a plane orthogonal to the traveling direction of the light traveling to each emission surface. By making the back wall reflection surface 33 and the area of the three emission surfaces equal, each emission surface is uniformly illuminated. As described above, the conventional vehicular lamp considers only the use of light that directly reaches each emission surface. Therefore, in the conventional vehicular lamp, in order to increase the area of each emission surface, it is necessary to increase the thickness of the side wall portion 40 and increase the depth of the back wall reflection surface 33, which leads to an overall increase in size. I will end up.

  On the other hand, in the vehicular lamp 10 of the present invention, in order to positively utilize stray light, which is the other light, in addition to the light directly reaching each emission surface, the first emission location 45 is provided on each emission surface. In addition, the second emission point 46 is provided as appropriate. In the vehicular lamp 10, by making the areas of the three optical paths and the back wall reflection surface 33 on the above-mentioned surfaces equal to the areas of the first emission points 45 of the three emission surfaces, the first emission points 45 are evenly distributed. It's shining. In addition to this, the vehicular lamp 10 illuminates the first emission point 45 by providing the second emission point 46 as a surface enlarged on the same plane of the first emission point 45 to the side closer to the optical axis Ae. The stray light that is not used for is actively used to illuminate the second emission point 46. Therefore, in the vehicular lamp 10, as compared with the conventional vehicular lamp, each emission surface is enlarged without increasing the overall thickness of the side wall portion 40 or increasing the area of the back wall reflecting surface 33. That is, the light emission width can be widened, and the overall size can be prevented from increasing. Further, since the vehicular lamp 10 emits stray light, which is not used to illuminate each first emission point 45, from each second emission point 46, it affects the light emission mode at each first emission point 45. Without increasing the size of each emission surface. In addition, in the vehicular lamp 10, since the thickness of the side wall portion 40 is extremely partially increased by providing the respective second emitting portions 46 in the light guide 22, the light guide 22 can be provided more easily than the conventional configuration. The influence on the molding process (mainly the cooling process) can be minimized.

  The vehicular lamp 10 of the first exemplary embodiment can obtain the following operational effects.

  The vehicular lamp 10 has a first emission surface that emits light that is directly guided by the emission surface 41 that emits light from the light source 21 that is reflected by the reflection surface (side wall reflection surface 44). It is assumed to have a location 45 and a second exit location 46 that is formed by an enlarged surface on the same plane as the first exit location 45. The vehicular lamp 10 can illuminate the first emission point 45 evenly and can also illuminate the second emission point 46 by stray light that is not used for illuminating the first emission point 45. Therefore, in the vehicular lamp 10, the emission surface 41 is enlarged without increasing the overall thickness of the side wall portion 40 or increasing the area of the back wall reflecting surface 33, as compared with the conventional vehicular lamp. Therefore, it is possible to prevent the entire size from increasing.

  In the vehicular lamp 10, the light guide 22 has the inner wall portion 30 and the side wall portion 40, the side wall base 40 a of the side wall portion 40 is provided with a reflection surface (side wall reflection surface 44), and the tip end raised at the side wall portion 40. An emission surface 41 is provided on each of the end surface of 40b and at least one step portion provided on the way of rising. In the vehicle lamp 10, the light guide 22 has the first emission points 45 on all the emission surfaces 41 and the second emission points 46 on at least one emission surface 41. Therefore, the vehicular lamp 10 can increase the size of the emission surface 41 without appropriately increasing the thickness of the entire sidewall 40 or increasing the area of the reflection surface while appropriately illuminating the plurality of emission surfaces 41. It is possible to prevent the entire size from increasing. Further, since the vehicular lamp 10 allows the plurality of emission surfaces 41 located at different positions in the irradiation direction to be illuminated and visually recognized, a sense of depth can be realized and the designability can be improved. In addition, since the vehicular lamp 10 is provided with the plurality of emission surfaces 41 at different positions in the irradiation direction, it is possible to realize a sense of depth even when it is not lit, and it is possible to improve the design.

  The vehicle lamp 10 includes the side wall 40 surrounding the back wall 30 in the light guide 22, and the emission surface 41 has a plurality of independent annular shapes surrounding the back wall 30. Therefore, the vehicular lamp 10 can be visually recognized as a plurality of annular lights that surround the back wall portion 30 by emitting light from each emission surface 41, and the designability can be improved. In particular, since the vehicular lamp 10 has a plurality of independent annular shapes that surround the back wall portion 30 while setting the respective emission surfaces 41 at different positions in the irradiation direction, it is possible to further realize a sense of depth and further enhance designability. be able to.

  In the vehicular lamp 10, the light guide 22 has the side wall portion 40 inclined so that the side of the leading end 40b that rises up more than the side of the side wall base portion 40a separates from the optical axis Ae. Therefore, the vehicular lamp 10 surrounds the inner wall portion 30 while gradually increasing the opening area of the light guide 22 from the inner wall portion 30 toward the tip 40b side of the side wall portion 40. It can be realized more and the designability can be further enhanced.

  The vehicular lamp 10 has the second emission point 46 on each emission surface 41 closer to the optical axis Ae than the first emission point 45. Therefore, the vehicular lamp 10 directly travels from the light source 21 to the back wall portion 30 in the light guide 22 to each first emission point 45 of the light reflected by the reflection surface (side wall reflection surface 44). It is possible to efficiently guide stray light, which is light other than the reflected light, to the second emission point 46 and emit the stray light from the second emission point 46. In addition, in the vehicular lamp 10, as the opening area of the light guide 22 gradually increases as the front side in the irradiation direction increases, the size of the annular emission surface 41 also gradually increases, so that a sense of depth can be further realized. It is possible to improve the design.

  Therefore, the vehicle lamp 10 of the first embodiment as the vehicle lamp according to the present disclosure can increase the area of the emission surface 41 without increasing the size.

  Next, a vehicle lamp 10A of Example 2 which is an embodiment of the present disclosure will be described with reference to FIGS. 4 and 5. The vehicular lamp 10A is obtained by modifying the configuration of the side wall portion 40 of the light guide 22 of the vehicular lamp 10 of the first embodiment. The vehicular lamp 10A has the same basic concept and configuration as the vehicular lamp 10 according to the first embodiment. Therefore, the same components are denoted by the same reference numerals, and detailed description thereof will be omitted.

  First, in the vehicle lamp 10A according to the second embodiment, the second light emitting portion 46 is provided only on the second light emitting surface 412 in the light guide 22A of the lamp unit 20A (see FIG. 5). That is, in the light guide 22A, the first emission surface 411 and the third emission surface 413 are formed only at the first emission location 45, and the second emission surface 412 is formed at the first emission location 45 and the second emission location 46. Has been done.

  In the vehicle lamp 10A, the recess 51 is provided in the outer side surface 43A of the side wall 40A of the light guide 22A. The recess 51 reduces the thickness of the side wall portion 40A, and is provided along the direction in which the side wall portion 40A extends. Reduce the weight of 22A. The recess 51 forms an outer displacement surface 52, a recess exit surface 53, and a recess entrance surface 54 in the side wall portion 40A. The outer displacement surface 52 is a surface in which the outer surface 43 of the first embodiment is translated inward, and the recess emission surface 53 and the recess incidence surface 54 are the directions in which light travels in the side wall portion 40A. They are opposed to each other (in the first embodiment, in a direction parallel to the outer surface 43A). In the first embodiment, the recess 51 is formed by disposing a mold when molding the light guide 22A. Therefore, the recess exit surface 53 and the recess entrance surface 54 are configured such that the distance between the recess exit surface 53 and the recess entrance surface 54 widens toward the outside in the width direction (the side away from the optical axis Ae). The angle formed by the concave exit surface 53 and the concave entrance surface 54 is basically set from the viewpoint of removing the mold, but is set from the viewpoint of forming an external optical path P1o and an internal optical path P1i described later. The possible angle range is defined.

  In this side wall portion 40A, the first optical path P1 through which the light directly reaches the first emission surface 411 from the side wall reflection surface 44A is outside the light guide body 22A between the recess emission surface 53 and the recess incidence surface 54. It is divided into an external optical path P1o passing through and an internal optical path P1i passing inside the light guide 22A inside the outer displacement surface 52. Accordingly, in the side wall portion 40A, the side wall reflection surface 44A has two first reflection surfaces 44A1 and 44A2.

  The angle at which the first reflection surface 44A1 directly advances the reflected light to the first emission surface 411 through the internal optical path P1i (see arrow L5) and directly to the second emission surface 412 and the third emission surface 413. (Optical design) (see arrow L6). The first reflecting surface 44A1 of the second embodiment is slightly inwardly convex, and the traveling directions of the reflected light are not parallel, but slightly diverge (see arrows L5 and L6).

  The second reflection surface 44A2 is set (optically designed) to an angle that allows it to directly travel to the first emission surface 411 through the external optical path P1o (see arrows L7 and L8). Specifically, the second reflection surface 44A2 refracts the light guide 22A so that the light guided by the back wall reflection surface 33 enters the recess entrance surface 54 after being emitted from the recess exit surface 53. The angle is set considering the rate. In the second embodiment, when the light is emitted from the first emission surface 411, the light that has passed through the external optical path P1o and the light that has passed through the internal optical path P1i are substantially parallel, and the first emission surface 411 and the external optical path P1o. It is formed as a single plane with the internal optical path P1i. Therefore, in the second embodiment, the light before passing through the internal optical path P1i to the first emission surface 411 and the light before passing through the external optical path P1o and entering from the recess incident surface 54 and before reaching the first emission surface 411. , Are parallel, the angles of the first reflecting surface 44A1 and the second reflecting surface 44A2 are set in consideration of the angles of the concave exit surface 53 and the concave entrance surface 54 and the refractive index (optical design). Has been done. Thereby, in the light guide 22A, the external optical path P1o and the internal optical path P1i can be formed in the side wall 40A. The light passing through the internal optical path P1i and the light passing through the external optical path P1o do not have to be parallel to each other, and are not limited to the configuration of the second embodiment.

  In the vehicle lamp 10A, as in the vehicle lamp 10 of the first embodiment, in the lamp unit 20A, light from the light source 21 travels into the inner wall portion 30 of the light guide 22A and heads for the side wall portion 40A. . Then, a part of the light traveling toward the side wall portion 40A directly reaches the side wall reflecting surface 44A, and a part of the light is reflected by the first reflecting surface 44A1 and passes through the two optical paths (P2, P3) to each emission surface (412). 413), another part is reflected by the first reflection surface 44A1 and passes through the internal optical path P1i of the first optical path P1 to reach the first emission surface 411. The other part of the light that directly goes to the side wall portion 40A is reflected by the second reflecting surface 44A2 and is emitted from the recess emitting surface 53 to the outside of the light guide 22A and is guided from the recess incident surface 54 to the light guide. The light enters the inside of 22A, that is, passes through the external optical path P1o of the first optical path P1 and reaches the first emission surface 411. Thereby, even if the recess 51 is provided in the side wall portion 40A, the vehicle lamp 10A can illuminate the respective emission surfaces (411, 412, 413) as in the case where the recess 51 is not provided.

  Since the vehicular lamp 10A of the second embodiment has basically the same configuration as the vehicular lamp 10 of the first embodiment, the same effect as that of the first embodiment can be obtained.

  In addition, in the vehicle lamp 10A, in the light guide 22A, the recess 51 for reducing the thickness is provided in the side wall portion 40A, and the side wall portion 40A is formed with the external optical path P1o and the internal optical path P1i. Therefore, in the vehicular lamp 10A, the emission surface 41 can be increased without increasing the area of the back wall reflection surface 33 while reducing the thickness of the side wall portion 40A as compared with the conventional vehicular lamp. The entire size can be prevented from increasing.

  Further, the vehicle lamp 10A is provided with a first reflecting surface 44A1 corresponding to the internal optical path P1i and a second reflecting surface 44A2 corresponding to the external optical path P1o as reflecting surfaces (sidewall reflecting surfaces 44A). That is, in the vehicle lamp 10A, the first reflecting surface 44A1 corresponding to the light passing through the inside of the side wall portion 40A including the internal optical path P1i and the outside of the side wall portion 40A (external optical path due to the provision of the recess 51). The reflecting surface is divided into a second reflecting surface 44A2 corresponding to light passing through P1o). Therefore, in the vehicle lamp 10A, even if the recess 51 is provided to reduce the weight of the side wall portion 40A, each emission surface (411, 412, 413) can be appropriately illuminated as in the case where the recess 51 is not provided. You can

  Therefore, the vehicle lamp 10A according to the second embodiment as the vehicle lamp according to the present disclosure can increase the area of the emission surface 41 without increasing the size.

  Although the vehicular lamp of the present disclosure has been described above based on each embodiment, the specific configuration is not limited to each embodiment, and deviates from the gist of the invention according to each claim of the claims. Unless otherwise, design changes and additions are allowed.

  In each embodiment, the side walls 40, 40A are provided with three emission surfaces (411, 412, 413), but the number of emission surfaces (the number of steps in the side walls 40, 40A) may be set appropriately. Well, it is not limited to the configuration of each embodiment.

  Further, in each of the embodiments, each of the side wall portions 40 and 40A (each of the emission surfaces 41 provided therein) has a rectangular shape surrounding the inner wall portion 30. However, each of the side wall portions 40 and 40A (each of the emission surfaces 41) may surround the back wall portion 30 with another shape, or may not surround the back wall portion 30, and is not limited to the configuration of each embodiment.

  Further, in each of the embodiments, the second emitting portion 46 is provided only on a part of the emitting surface. However, the second emission points 46 may be provided on all the emission surfaces, or may be provided on the emission surfaces which are a combination different from those of the respective embodiments, and are not limited to the configurations of the respective embodiments.

  In each of the embodiments, the second emission location 46 is provided on each emission surface 41 closer to the optical axis Ae than the first emission location 45. However, the second emission location 46 is not limited to the configuration of each embodiment as long as the second emission location 46 is configured by a surface enlarged on the same plane as the first emission location 45.

      10, 10A Vehicle lamp 21 Light source 22, 22A Light guide 30 Back wall part 40, 40A Side wall part 40a Side wall base 40b Tip 41 Exit surface 44, 44A (As an example of a reflective surface) Side wall reflective surface 44A1 First reflective surface 44A2 2nd reflective surface 45 1st emission location 46 2nd emission location 51 Recess Ae Optical axis P1i Internal optical path P1o External optical path

Claims (7)

A light source; and a light guide body for guiding and emitting light from the light source,
The light guide has an emission surface that emits the guided light to the outside, and a reflection surface that reflects the incident light from the light source toward the emission surface,
The emission surface includes a first emission portion that emits light that is directly guided by being reflected by the reflection surface, and a second emission portion that is a surface that is enlarged on the same plane as the first emission portion. And a vehicle lamp. The light guide body has a back wall portion that extends in a direction intersecting the optical axis of the light source while facing the light source, and a sidewall portion that rises from the back wall portion to the front side of the optical axis,
The reflecting surface is provided on a side wall base that is continuous with the inner wall in the side wall,
The emission surface is provided on each of the end surface of the tip that rises in the side wall portion and at least one step portion that is provided during the rise,
The first emission point is provided on all the emission surfaces,
The vehicular lamp according to claim 1, wherein the second emitting portion is provided on at least one of the emitting surfaces. The side wall portion is provided with a recess for reducing the thickness,
The side wall portion passes through the recess and passes through the outside of the side wall portion to reach the emission surface from the reflection surface to the emission surface, and the side wall portion passes inside the side wall portion to reach the emission surface from the reflection surface. The vehicular lamp according to claim 2, wherein an internal optical path is formed.   The vehicular lamp according to claim 3, wherein the reflecting surface has a first reflecting surface corresponding to the internal optical path and a second reflecting surface corresponding to the external optical path. The side wall portion is provided so as to surround the back wall portion,
The vehicular lamp according to any one of claims 2 to 4, wherein each of the emission surfaces has a plurality of independent annular shapes that surround the back wall portion. The light source is provided facing the center of the back wall portion,
The vehicular lamp according to claim 5, wherein the side wall portion is inclined so that a leading end side thereof which is upright rather than the side wall base portion side is separated from the optical axis.   The vehicular lamp according to claim 5 or 6, wherein the second emission point is provided closer to the optical axis than the first emission point.