JP2024024516A - Optical member and vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical member and a vehicular lighting fixture that can apply light to a wide area including a lower part at a near position.

SOLUTION: An optical member (10) comprises: a first reflection part (14a) for reflecting a portion of illumination light; a second reflection part (14b) provided separately from the first reflection part (14a) in at least a height direction, and for reflecting another portion of the illumination light; a rear light guide part (11c) provided so as to extend rearward from the second reflection part (14b); a lower refraction part (15a) provided at an end part of the rear light guide part (11c), and for refracting the illumination light reflected by the first reflection part (14a), at least downward; and a rear illumination part (15b) provided at the end part of the rear light guide part (11c), and for applying the illumination light reflected by the second reflection part (14b), rearward.

SELECTED DRAWING: Figure 1

COPYRIGHT: (C)2024,JPO&INPIT

Description

The present invention relates to an optical member and a vehicle lamp.

2. Description of the Related Art Conventionally, in the technical field of vehicle lamps, combination lamps have been used in which multiple types of lighting functions are housed and integrated into one lamp housing. Examples of such combination lamps include a front combination lamp that accommodates headlights, side marker lights, turn signal lights, etc., and a rear combination lamp that accommodates brake lights, tail lights, side marker lights, turn signal lights, etc. . In addition, the types of lamps housed in these combination lamps have been increasing in recent years.

Furthermore, in recent years, vehicles have become widely used with back cameras that capture an image of the rear of the vehicle when reversing, and monitors that display images captured by the back cameras. In order to assist in checking the rear using the rear camera and monitor, backup lamps are also used that emit light to an imaging range behind the vehicle. Patent Document 1 describes a rear combination lamp that incorporates the function of a backup lamp that illuminates the road surface at the rear of the vehicle. In addition to the backup lamp, it is also envisaged that an auxiliary vehicle lamp that irradiates light around the vehicle may be incorporated into the combination lamp.

JP2022-084313A

However, the combination lamp incorporates multiple functions as described above, and the size and shape of the auxiliary vehicle lamp are often limited depending on the priority of the functions and design requirements. Therefore, it has been difficult to irradiate a wide area around the vehicle with light from the auxiliary vehicle lamp. In particular, in the case of auxiliary vehicle lamps that are long in the horizontal direction and do not have sufficient size in the height direction, it is difficult to irradiate light onto the road surface near the vehicle.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide an optical member and a vehicular lamp that can irradiate light over a wide range including the lower part of a nearby position. shall be.

In order to solve the above problems, the optical member of the present invention includes a first reflecting section that reflects a part of the irradiated light, and the first reflecting section are provided separated at least in the height direction, and the irradiated light a second reflecting section that reflects another part of the second reflecting section; a rear light guiding section provided extending rearward from the second reflecting section; a downward refracting section that refracts at least the irradiation light reflected at the second reflecting section downward; and a downward refraction section provided at the end of the rear light guide section that irradiates the irradiation light reflected at the second reflection section backward. It is characterized by having a rear irradiation part.

In such an optical member of the present invention, the irradiation light reflected by the second reflection part is irradiated from the end of the rear light guide part, and the irradiation light reflected by the first reflection part is directed downward by the downward refraction part. Since the light is refracted and irradiated, it is possible to irradiate a wide area including the lower part of a nearby position.

Further, in one aspect of the present invention, the first reflection section is located above the second reflection section, and the downward refraction section is located below the rear illumination section.

Further, in one aspect of the present invention, the downward refracting section further refracts the irradiated light in the lateral direction.

Further, in one aspect of the present invention, a lower light guiding part is provided extending downward from the first reflecting part and the second reflecting part, and a third reflecting part is provided on one surface of the lower light guiding part. is provided, and the irradiation light reflected by the third reflecting section enters the first reflecting section and the second reflecting section.

Moreover, in one aspect of the present invention, a protrusion that protrudes upward is formed in the rear light guiding part, and at least a part of the first reflection part is provided in the protrusion.

Moreover, in one aspect of the present invention, a boundary rib is provided at the boundary between the first reflective section and the second reflective section.

Further, in order to solve the above-mentioned problems, a vehicle lamp according to the present invention is characterized in that it includes the optical member according to any one of the above-mentioned items, and a light-emitting part disposed opposite to the light incident part of the optical member. shall be.

According to the present invention, it is possible to provide an optical member and a vehicular lamp that can irradiate light to a wide range including the lower part of a nearby position.

FIG. 1 is a schematic cross-sectional view showing an overview of a vehicle lamp 100 according to a first embodiment. 2A and 2B are diagrams schematically showing an outline of an optical member 10 used in a vehicle lamp 100, in which FIG. 2A is a top view, and FIG. 2(c) is a perspective view seen obliquely from above. 3(a) is a rear front view, and FIG. 3(b) is a perspective view seen diagonally from above; FIG. FIG. 3(c) is a top view. FIG. 2 is a schematic perspective view showing an enlarged view of the vicinity of angle adjustment reflection sections 14a and 14b in the optical member 10. FIG. 5(a) is a top view, and FIG. 5(b) is a perspective view seen from diagonally above. FIG.

(First embodiment)
Embodiments of the present invention will be described in detail below with reference to the drawings. Identical or equivalent constituent elements, members, and processes shown in each drawing are denoted by the same reference numerals, and redundant explanations will be omitted as appropriate. FIG. 1 is a schematic cross-sectional view showing an overview of a vehicle lamp 100 according to the present embodiment. In Figure 1, the right direction is the positive direction of the x-axis direction (vehicle rearward), the downward direction is the positive direction of the z-axis direction (vehicle downward direction), and the depth direction perpendicular to the page is the y-axis direction (vehicle width direction). shall be. As shown in FIG. 1, the vehicle lamp 100 includes an optical member 10 and a light emitting element 20. Further, arrows shown by solid lines, broken lines, etc. in the figure indicate typical optical paths of the irradiation light emitted from the light emitting element 20.

The optical member 10 is made of a material that transmits light, and is a member that guides the light emitted by the light emitting element 20 inside and emits it in a predetermined direction. As shown in FIG. 1, the optical member 10 includes a light guide section 11, a light incidence section 12, a distribution reflection section 13, angle adjustment reflection sections 14a and 14b, a downward refraction section 15a, and a rear illumination section 15b. It includes a boundary rib 16 and a protrusion 17.

The light guide section 11 is made of a material that transmits light, is molded by a known method, and includes an incident light guide section 11a, a lower light guide section 11b, and a rear light guide section 11c. The specific material constituting the light guide section 11 is not limited, and for example, an acrylic resin material or a glass material can be used. The light guide section 11 is formed with a smooth surface so that light that reaches the surface at a critical angle or more is totally reflected due to the refractive index difference between the constituent material and the air.

The incident light guide section 11a is arranged near the light emitting element 20, and is a part that guides the irradiation light that has entered from the light incidence section 12 to the lower light guide section 11b. Although FIG. 1 shows an example in which the yz plane of the incident light guiding section 11a is the light incident section 12 and the light emitting element 20 is arranged in the negative direction of the x axis, the shape and orientation of the light incident section 12 are not limited. Further, a distribution reflection section 13 is provided on the surface of the incident light guide section 11a that faces the light incidence section 12.

The lower light guide section 11b is formed to extend in the vertical direction (z-axis direction), is provided between the incident light guide section 11a and the rear light guide section 11c, and is configured to direct the irradiation light arriving from the incident light guide section 11a. This is a portion that guides light to the rear light guide section 11c. The lower light guide section 11b is provided with a distribution reflection section 13 on a surface facing the incident light guide section 11a. Further, the upper surface of the lower light guiding portion 11b is inclined with respect to the x-axis direction and the z-axis direction, and angle adjustment reflecting portions 14a, 14b and boundary ribs 16 are provided. In other words, the lower light guide portion 11b is provided extending downward from the angle adjustment reflection portions 14a, 14b.

The rear light guide section 11c is provided near the upper end of the lower light guide section 11b and extends backward (in the x-axis direction) from the angle adjustment reflection section 14b, and directs the irradiation light that has arrived from the lower light guide section 11b to the rear end. This is the part that guides the light up to and irradiates it to the outside. The upper surface and lower surface of the rear light guide portion 11c are formed parallel to the xy plane, and are formed as substantially flat plate-shaped portions. Furthermore, a protrusion 17 is provided on the upper surface of the rear light guide section 11c near the boundary with the lower light guide section 11b. An end surface inclined with respect to the x-axis, y-axis, and z-axis is formed at the rear end of the rear light guide section 11c, and a lower refraction section 15a and a rear illumination section 15b are provided.

The light incidence part 12 is provided in the incidence light guide part 11a facing the light emitting element 20, and is a part that takes in the irradiation light emitted by the light emitting element 20 into the incidence light guide part 11a. In the example shown in FIG. 1, the yz plane is shown as the light incidence part 12, but in order to efficiently take in the irradiated light from the light emitting element 20, it may have a shape protruding in the direction of the light emitting element 20. Further, depending on the directivity of the irradiated light from the light emitting element 20, the light entrance portion 12 may be formed as a concave surface.

The distribution reflection section 13 is provided across the input light guide section 11a and the lower light guide section 11b facing the light incidence section 12, and reflects the irradiated light upward (in the negative direction of the z-axis) and laterally (in the direction of the y-axis). This part corresponds to the third reflecting part in the present invention. The distributed reflection section 13 has a curved shape divided into a plurality of areas as described later, and when the irradiated light is incident at a critical angle or more, the irradiated light is totally reflected. Here, an example is shown in which total reflection due to the difference in refractive index with air is used as the distributed reflection section 13, but a reflective film may be formed of metal or the like on the surface of each region of the distributed reflection section 13.

The angle adjusting reflection part 14a is a part where a part of the irradiation light that has been reflected by the distribution reflection part 13 and has traveled inside the lower light guide part 11b reaches and is reflected, and corresponds to the first reflection part in the present invention. are doing. The angle adjustment reflection section 14a is provided separately above the angle adjustment reflection section 14b in the height direction (z-axis direction), and a part of the angle adjustment reflection section 14a is provided up to the protrusion 17. The angle adjusting reflection section 14a is divided into a plurality of regions in the horizontal direction as described later, and when the irradiated light is incident on each region at a critical angle or more, the irradiated light is totally reflected. In this embodiment, an example is shown in which each region is a flat surface as the angle adjustment reflection section 14a, but it may be configured as a concave surface or a convex surface. Further, although an example is shown here in which total reflection due to the difference in refractive index with air is used as the angle adjustment reflection section 14a, a reflective film made of metal or the like may be formed on the surface of the angle adjustment reflection section 14a.

The angle adjusting reflection part 14b is a part where a part of the irradiation light that has been reflected by the distribution reflection part 13 and has traveled inside the lower light guide part 11b reaches and is reflected, and corresponds to the second reflection part in the present invention. are doing. The angle adjustment reflection section 14b is provided separately below the angle adjustment reflection section 14a in the height direction (z-axis direction). The angle adjusting reflection section 14b is divided into a plurality of regions in the horizontal direction as described later, and when the irradiated light is incident on each region at a critical angle or more, the irradiated light is totally reflected. In this embodiment, an example is shown in which each region of the angle adjusting reflection section 14b is a flat surface, but it may be configured as a concave surface or a convex surface. Further, although an example is shown here in which total reflection due to the difference in refractive index with air is used as the angle adjustment reflection section 14b, a reflective film made of metal or the like may be formed on the surface of the angle adjustment reflection section 14b.

The downward refraction part 15a is a light exit surface provided at the rear end of the rear light guide part 11c, and the irradiation light reflected by the angle adjustment reflection part 14a reaches the lower refraction part 15a, and the irradiation light is changed due to the difference in refractive index with the air. This is the part that refracts the light downward and laterally to irradiate the light. As shown in FIG. 1, the downward refraction section 15a is located below the rear illumination section 15b at the end of the rear light guide section 11c. Further, the angle of inclination of the downward bending section 15a is different from the angle of inclination of the rear illumination section 15b. The downward refracting portion 15a is divided into a plurality of regions in the horizontal direction, as described later, and the irradiated light is incident on each region at an angle less than the critical angle, so that the irradiated light is not totally reflected and is refracted according to the inclination angle. be done. In this embodiment, an example in which each region is a flat surface as the downward refraction portion 15a is shown, but it may be configured as a concave surface or a convex surface.

The rear irradiation section 15b is a light output surface provided at the rear end of the rear light guide section 11c, and the irradiation light reflected by the angle adjustment reflection section 14b reaches the rear irradiation section 15b, and irradiates the irradiation light to the rear outside. It is a part. The rear irradiation section 15b is divided into a plurality of regions in the horizontal direction, as will be described later, and when the irradiation light enters each region at an angle less than a critical angle, the irradiation light is transmitted without being totally reflected. Although this embodiment shows an example in which each area of the rear irradiation section 15b is a flat surface, it may be configured as a concave surface or a convex surface. Further, although FIG. 1 shows an example in which the irradiation light is irradiated backward from the rear irradiation part 15b for the sake of simplicity, even if the irradiation light is refracted and irradiated according to the inclination angle of the rear irradiation part 15b. good.

The boundary rib 16 is a portion that is provided to protrude at the boundary between the angle adjustment reflecting portions 14a and 14b. The angle adjusting reflection sections 14a and 14b have different inclination angles with respect to the x-axis direction and the y-axis direction in order to make the incident angle and reflection angle of irradiation light different, as will be described later. Therefore, when the angle adjusting reflection parts 14a and 14b are formed of flat inclined surfaces, the boundaries thereof form an apex angle that intersects at a predetermined angle, and there is a possibility that stray light may occur in the irradiated light that reaches the apex angle. Further, when a curved surface shape is formed at the boundary so that no apex angle is formed at the boundary, the area of the curved surface becomes large and the effective reflection area of the angle adjusting reflection parts 14a and 14b becomes small. Therefore, by providing the boundary rib 16 at the boundary between the angle adjustment reflection parts 14a and 14b, it is possible to take the light that has reached the boundary into the boundary rib 16 and suppress the reflection of the irradiated light from the boundary toward the rear light guide part 11c. can. Although FIG. 1 shows an example in which the boundary rib 16 is provided, the boundary rib 16 may be omitted if the influence of stray light is small.

The protrusion 17 is a portion protruding from the upper surface of the rear light guide 11c near the boundary between the lower light guide 11b and the rear light guide 11c. Although the shape of the protrusion 17 is not limited, in order to secure the path of the irradiated light reflected by the angle adjustment reflection part 14a, as described later, it is raised toward the rear of the rear light guide part 11c (in the positive direction of the x-axis). Preferably, the opacity is reduced. Further, the angle adjustment reflection section 14a may be provided in a part of the protrusion 17.

The light emitting element 20 is disposed facing the light incident part 12 of the optical member 10, is mounted on a mounting board (not shown) on which wiring is formed, and is supplied with a current by a drive circuit to produce a predetermined color. It is an electronic component that emits light, and corresponds to the light emitting section in the present invention. Although the specific structure of the light emitting element 20 is not limited, it may be an LED package that combines a light emitting diode (LED) that emits primary light and a wavelength conversion member that converts a part of the primary light into secondary light. can be used. Further, the material of the light emitting diode is not limited either, and known materials and structures can be used. As an example, a GaN-based LED that emits blue light can be used. Further, the material of the wavelength conversion member is not limited, and for example, a YAG-based phosphor material that emits yellow light when excited by blue light can be used. Further, the light emitting element 20 is not limited to an LED, but may be a semiconductor laser or the like.

As shown in FIG. 1, in the vehicle lamp 100 of this embodiment, the irradiation light emitted from the light emitting element 20 enters the light guide section 11 from the light incidence section 12. In the light guide section 11, the irradiated light travels through the incident light guide section 11a, and a part of it reaches the distribution reflection section 13.

As shown by the broken line arrow in FIG. 1, a part of the irradiation light that reaches the distribution reflection section 13 is totally reflected at an angle according to the curved shape of the distribution reflection section 13, and reaches the angle adjustment reflection section 14a. . The irradiated light that has reached the angle adjustment reflection section 14a is totally reflected at an angle corresponding to the inclination angle of the angle adjustment reflection section 14a, travels obliquely downward through the protrusion 17 and the rear light guide section 11c, and reaches the lower refraction section 15a. reach. Since the downward refraction part 15a is set at an angle at which the reaching irradiation light is not totally reflected, the irradiation light is refracted downward and in the lateral direction due to the difference in refractive index between the material constituting the light guide part 11 and the air. be done.

As shown by the solid line arrow in FIG. 1, a part of the irradiation light that reaches the distribution reflection section 13 is totally reflected at an angle according to the curved shape of the distribution reflection section 13 and reaches the angle adjustment reflection section 14b. . The irradiation light that has reached the angle adjustment reflection section 14b is totally reflected at an angle corresponding to the inclination angle of the angle adjustment reflection section 14b, travels inside the rear light guide section 11c, and reaches the rear illumination section 15b. Since the rear irradiation section 15b is set at an angle at which the reaching irradiation light is not totally reflected, the rear irradiation section 15b transmits the reaching irradiation light, and the rear of the vehicle lamp 100 is irradiated with the irradiation light. At this time, by tilting the rear irradiation part 15b with respect to the x-axis direction, y-axis direction, or z-axis direction, the irradiation light can be directed appropriately due to the refractive index difference between the material constituting the light guide part 11 and the air. It is possible to irradiate by refracting the light in the direction.

As shown in FIG. 1, in the optical member 10 and the vehicle lamp 100 of this embodiment, the angle adjustment reflection section 14a is located above the angle adjustment reflection section 14b, and the downward refraction section 15a is located at the rear illumination section. It is located below 15b. Therefore, the irradiation light emitted from the rear irradiation part 15b travels approximately horizontally within the rear light guide part 11c, whereas the irradiation light emitted from the lower refraction part 15a travels through the protrusion 17 and the rear light guide part 11c. It advances at a predetermined downhill angle. As a result, since the lower refraction portion 15a is inclined at a predetermined angle with respect to the x-axis, the incident angle of the irradiation light to the lower refraction portion 15a becomes large, and the irradiation light is refracted at a large angle with respect to the x-axis. Can be irradiated externally.

FIG. 2 is a diagram schematically showing the outline of the optical member 10 used in the vehicle lamp 100, FIG. 2(a) is a top view, and FIG. 2(b) is a perspective view seen diagonally from below. FIG. 2(c) is a perspective view seen diagonally from above. As shown in FIGS. 2(a) to 2(c), the end portion of the rear light guide portion 11c is also formed to be inclined with respect to the x-axis direction. In addition, in correspondence with the inclination of the rear light guide section 11c, the lower refraction section 15a and the rear illumination section 15b are divided into a plurality of regions having a plurality of steps, and in each region, the The inclination angle with respect to the z-axis direction is set respectively. In the example shown in FIG. 2(c), the rear irradiation part 15b has a curved surface shape curved along the z-axis direction, but the rear irradiation part 15b in each area is further curved along the z-axis direction. It may be divided into a plurality of regions to have a plurality of planar shapes with different inclination angles.

Further, the angle adjustment reflecting sections 14a and 14b are divided into a plurality of regions along the y-axis direction, and the inclination angles with respect to the x-axis direction, the y-axis direction, and the z-axis direction are respectively set in each region. . Further, the angle adjustment reflection section 14a is formed in a part of the light guide section 11 in the y-axis direction, and a boundary rib 16 is formed in a corresponding region. Further, the light incidence section 12 is formed to partially protrude from the incidence light guide section 11a.

As shown in FIG. 2(b), the distributed reflection section 13 is divided into a first region 13a, a second region 13b, and a third region 13c. Further, the side surface of the lower light guide portion 11b is an inclined side surface 13d that is inclined with respect to the y-axis direction and the z-axis direction. The angle of inclination of the inclined side surface 13d is set so that the incident irradiation light is totally reflected. Here, an example is shown in which the inclined side surface 13d is inclined at an angle that totally reflects the irradiated light, but a reflective film may be formed of metal or the like on the inclined side surface 13d.

The first region 13a, the second region 13b, and the third region 13c each have a curved shape that is concave in the x-axis direction. The curved shapes of the first region 13a, second region 13b, and third region 13c are not limited, and shapes obtained by partially cutting out a free-form surface, a paraboloid of revolution, an ellipsoid of revolution, etc. can be used. Further, the intersection of the first region 13a, the second region 13b, and the third region 13c is provided at a position facing the light incidence section 12, and the light emitting element 20 is also arranged facing the intersection.

FIG. 3 is a schematic diagram illustrating light irradiation via the rear irradiation part 15b in the optical member 10, FIG. 3(a) is a rear front view, and FIG. 3(b) is a perspective view seen diagonally from above. FIG. 3(c) is a top view. As shown in FIGS. 3(a) and 3(b), the irradiation light incident from the light incidence section 12 is transmitted to the first region 13a, the second region 13b, and the third region 13c, which are the plurality of regions of the distribution reflection section 13. It reaches and is reflected.

The irradiation light incident on the first region 13a is reflected according to the curved shape of the first region 13a, travels upward (in the negative direction of the z-axis) through the lower light guide section 11b, and reaches the angle adjustment reflection section 14b. Here, the region where the irradiation light reflected by the first region 13a reaches is a region located near the center in the y-axis direction among the plurality of regions of the angle adjustment reflection section 14b. The irradiation light that has reached the angle adjustment reflection section 14b is totally reflected, travels approximately horizontally within the rear light guide section 11c, reaches the rear irradiation section 15b, and is irradiated rearward from the rear irradiation section 15b.

The irradiation light that has entered the second region 13b and the third region 13c is reflected according to the curved shape of the second region 13b and the third region 13c, and moves through the lower light guide section 11b in the lateral direction (the negative direction of the y-axis and the negative direction of the y-axis). (forward direction) and reaches the inclined side surface 13d. The irradiated light that has reached the inclined side surface 13d is totally reflected, travels upward within the lower light guide section 11b, and reaches the angle adjustment reflection section 14b. Here, the regions where the light reflected by the second region 13b and the third region 13c reach are regions located near both ends in the y-axis direction of the plurality of regions of the angle adjustment reflection section 14b. The irradiation light that has reached the angle adjustment reflection section 14b is totally reflected, travels approximately horizontally within the rear light guide section 11c, reaches the rear irradiation section 15b, and is irradiated rearward from the rear irradiation section 15b. At this time, the irradiated light reflected by the angle adjustment reflecting portions 14b located near both ends has a component in the lateral direction (y-axis direction) and travels obliquely with respect to the rear (x-axis direction). do.

As shown by the dashed line in FIG. 3C, the irradiation light reflected by the angle adjustment reflection section 14b near the center advances in the x-axis direction. Therefore, the angle of incidence of the irradiation light on the rear irradiation part 15b becomes relatively small, and the irradiation light is transmitted without being refracted in the y-axis direction and is irradiated rearward. The irradiation light along this path is also refracted in the z-axis direction at the rear irradiation section 15b and irradiated onto the road surface at the rear.

On the other hand, as shown by the broken line and the two-dot chain line in FIG. 3(c), the irradiation light reflected by the angle adjustment reflection section 14b near both ends crosses the inside of the rear light guide section 11c in the y-axis direction. As it progresses. Therefore, the angle of incidence of the irradiation light on the rear irradiation section 15b becomes relatively large, and the irradiation light is transmitted after being largely refracted in the y-axis direction. The irradiation light along this path is also refracted in the z-axis direction at the rear irradiation section 15b and irradiated onto the road surface at the rear.

The arrow shown with a solid line in FIG. 3(c) schematically shows the path of the irradiation light reflected by the angle adjustment reflection section 14a. Since the angle adjustment reflection section 14a and the angle adjustment reflection section 14b are separated in the height direction and formed as different slopes, the light is incident on the angle adjustment reflection section 14a and the angle adjustment reflection section 14b, respectively, at the same position in the y-axis direction. The irradiated light is also reflected at different angles and travels inside the rear light guide section 11c. Therefore, by increasing the reflection angle in the y-axis direction at the angle adjustment reflection section 14a, it is possible to further increase the incident angle of the irradiated light on the downward refraction section 15a, thereby further increasing the refraction in the y-axis direction. can.

FIG. 4 is a schematic perspective view showing an enlarged view of the vicinity of the angle adjustment reflection parts 14a and 14b in the optical member 10. As shown in FIG. 4, the angle adjustment reflection section 14a is partially provided in the y-axis direction, and a boundary rib 16 is provided in a region corresponding to the angle adjustment reflection section 14a. In the area where the angle adjustment reflection section 14a is not provided, the angle adjustment reflection section 14a is provided extending up to the protrusion 17. However, in the optical member 10 and the vehicle lamp 100 of this embodiment, the irradiated light is not reflected from the distribution reflector 13 to the upwardly extended region of the angle adjustment reflector 14a. This is because even in the region extending upward, the angle adjustment reflecting section 14a has the same inclination angle as the downward direction, making it difficult for the irradiated light to reach the downward refraction section 15a. Therefore, the angle adjustment reflection section 14a provided in the area where the irradiation light does not reach can be omitted. However, by extending the angle adjustment reflecting portion 14a to a region where the irradiation light does not reach and providing it as a dummy region, the design of the vehicle lamp 100 when viewed from the rear can be improved.

FIG. 5 is a schematic diagram illustrating light irradiation through the downward refraction portion 15a in the optical member 10, FIG. 5(a) is a top view, and FIG. 5(b) is a perspective view seen from diagonally above. It is. As shown by various arrows in FIGS. 5(a) and 5(b), the irradiation light that reaches the angle adjustment reflection section 14a is reflected at a reflection angle according to the inclination angle of each area of the angle adjustment reflection section 14a. , travels inside the rear light guide section 11c and reaches the downward refraction section 15a. At this time, by tilting a part of the angle adjustment reflection section 14a in the lateral direction, the irradiated light travels diagonally across the rear light guide section 11c with respect to the x-axis direction.

FIG. 5 shows an example in which the optical member 10 and the vehicle lamp 100 are arranged at the rear left of the vehicle. The irradiated light reflected by the angle adjustment reflection section 14a and diagonally crossing the x-axis direction reaches the lower refraction section 15a at a large incident angle in the lateral direction (y-axis direction), and is therefore refracted at a larger refraction angle. irradiated. Further, as explained in FIG. 1, the path from the angle adjustment reflection section 14a to the downward refraction section 15a is inclined diagonally downward through the rear light guide section 11c, and is largely refracted downward (in the z-axis direction). be done. As a result, the optical member 10 and the vehicle lamp 100 shown in FIGS. 1 to 5 can effectively irradiate the road surface near the center of the vehicle and close to the vehicle. Furthermore, by using a vehicle lamp 100 that is symmetrical in shape to the optical member 10 shown in FIGS. 1 to 5 as the vehicle lamp 100 placed on the right rear side of the vehicle, it is possible to The irradiation light can be irradiated satisfactorily.

As described above, in the optical member 10 and the vehicle lamp 100 of the present embodiment, the angle adjustment reflection section 14a and the angle adjustment reflection section 14b are provided separately at least in the height direction. , a rear light guide section 11c, a downward refraction section 15a that refracts the irradiation light at least downward, and a rear irradiation section 15b that irradiates the irradiation light backward. Thereby, the irradiation light reflected by the angle adjustment reflection part 14b is irradiated from the end of the rear light guide part 11c, and the irradiation light reflected by the angle adjustment reflection part 14a is refracted downward by the downward refraction part 15a. Since the light is irradiated from the front, it is possible to irradiate a wide range of areas, including the area below nearby locations.

(Second embodiment)
Next, a second embodiment of the present invention will be described. Description of contents that overlap with those of the first embodiment will be omitted. In the first embodiment, the light incident part 12 is provided in the incident light guide part 11a, and the irradiation light reflected by the distribution reflection part 13 is made to reach the angle adjustment reflection parts 14a, 14b. The reflecting section 13 may be omitted. In this case, various lenses and reflecting mirrors are provided on the light incidence section 12 or the light emitting element 20, and the light amount distribution in the x-axis direction, y-axis direction, and z-axis direction is set, and the angle of the irradiated light is adjusted appropriately at the reflection section. It is preferable to reach 14a and 14b.

The present invention is not limited to the embodiments described above, and various modifications can be made within the scope of the claims, and embodiments obtained by appropriately combining technical means disclosed in different embodiments. are also included within the technical scope of the present invention.

DESCRIPTION OF SYMBOLS 100... Vehicle lamp 10... Optical member 11... Light guide part 11a... Incident light guide part 11b... Lower light guide part 11c... Rear light guide part 12... Light incidence part 13... Distribution reflection part 13a... First region 13b... 2nd region 13c...Third region 13d...Slanted side surfaces 14a, 14b...Angle adjustment reflecting section 15a...Downward bending section 15b...Backward irradiating section 16...Boundary rib 17...Protruding section 20...Light emitting element

Claims (7)

a first reflecting section that reflects a portion of the irradiated light;
a second reflecting section that is provided at least vertically separate from the first reflecting section and that reflects another part of the irradiated light;
a rear light guiding portion extending rearward from the second reflecting portion;
a downward refraction section that is provided at an end of the rear light guide section and refracts the irradiation light reflected by the first reflection section downward at least;
An optical member comprising: a rear irradiation section that is provided at the end of the rear light guiding section and irradiates the irradiation light reflected by the second reflection section to the rear. The optical member according to claim 1,
The first reflecting section is located above the second reflecting section,
The optical member is characterized in that the downward refraction section is located below the rear illumination section. The optical member according to claim 1,
The optical member is characterized in that the downward refraction section further refracts the irradiated light in a lateral direction. The optical member according to claim 1,
a lower light guiding portion extending downward from the first reflecting portion and the second reflecting portion;
A third reflecting section is provided on one surface of the downward light guiding section,
The optical member, wherein the irradiation light reflected by the third reflection section enters the first reflection section and the second reflection section. The optical member according to claim 1,
The rear light guide portion is formed with a protrusion that protrudes upward,
An optical member, wherein at least a portion of the first reflecting section is provided on the protruding section. The optical member according to claim 1,
An optical member characterized in that a boundary rib is provided at a boundary between the first reflection section and the second reflection section. The optical member according to any one of claims 1 to 6,
A vehicular lamp characterized by having a light emitting part disposed opposite to a light incident part of the optical member.

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