JP6228863B2 - Vehicle lighting - Google Patents

Description

  The present invention relates to a vehicular lamp.

  As a vehicular lamp, a light guide plate that allows light from a light source to enter from the rear end surface and exit from the front end surface, and light that has been subjected to light scattering processing on a portion of the surface between the rear end surface and the front end surface of the light guide plate By using a scattering portion, there is one that suppresses the occurrence of spotlight on the front end face (see Patent Document 1).

JP 2013-222675 A

  In the lamp using the light guide plate as described above, there is a problem that visibility is not very good because the emission efficiency from the front end surface of the light guide plate is good, but the area of the front end surface is small. It is also possible to emit light from the side surface of the light guide plate, but the light incident on the light guide plate is strongly emitted from the end surface on the opposite side of the incident end surface, so the emission efficiency at the side surface is low, and good visibility Sex cannot be obtained.

  An object of this invention is to provide the vehicle lamp which can improve the visibility of a lamp, suppressing the fall of the utilization efficiency of light.

The vehicular lamp according to the present invention is:
A light emitting unit;
An incident surface on which the light emitted from the light emitting unit is incident, a plate-shaped light guiding unit that guides the light incident on the incident surface, and an emission that emits the light guided by the light guiding unit A plate-like light guide having a surface, the incident surface provided at the rear end, and the output surface provided at the front end;
With
The plate-shaped light guide is
The light guide part includes a first light guide part and a second light guide part,
A first region portion that is arranged so that the incident surface and the emission surface face each other, and the light guided by the first light guide portion is emitted from the emission surface;
A portion formed continuously adjacent to the first region portion, wherein the second light guide portion includes a curved portion inclined more greatly than the first light guide portion in the front-rear direction; A second region where light guided by the second light guide is emitted from at least a part of the surface of the second light guide;
Have

According to the vehicular lamp having the above-described configuration, the light guided by the first light guide portion is emitted from the exit surface facing the entrance surface in the first region portion of the plate-shaped light guide. For this reason, the light radiate | emitted from the light emission part can be utilized efficiently.
Further, in the second region portion of the plate-like light guide, the light guided by the second light guide portion is emitted from at least a part of the surface of the curved portion. For this reason, surface light can be emitted in an area wider than the emission surface, and visibility can be improved.
Thus, by forming a curved portion in a part of the plate-like light guide and emitting light, the visibility of the lamp can be improved while suppressing a decrease in light use efficiency.

  In the vehicular lamp of the present invention, the emission surface is configured to emit the light guided by the light guide portion toward the front of the lamp in both the first region portion and the second region portion. It is preferable.

  According to the vehicular lamp having the above configuration, the light emitted from the light emitting unit can be used more efficiently. Further, in the second region portion, the design can be enhanced by applying strength to the emitted light from the surface of the second light guide and the emitted light from the exit surface.

  In the vehicle lamp of the present invention, the light emitting portion is a rod-shaped light guide that extends along a predetermined extending direction, and the light emitted from the light source is incident from one end and guided inside, It is preferable that light is emitted from an emission part formed along the extending direction toward the incident surface of the plate-like light guide.

  According to the vehicular lamp configured as described above, by using the rod-shaped light guide, light that is uniform and less uneven in the predetermined extending direction can be incident on the plate-shaped light guide. In addition, the number of light sources can be reduced and the cost can be reduced as compared with a configuration in which a plurality of light sources are arranged in parallel along the incident surface of the plate-like light guide.

In the vehicle lamp of the present invention, a plurality of the plate light guides are provided,
When viewed from the front of the lamp, it is preferable that at least a part of the second region portion of each of the plurality of plate-shaped light guides is disposed so as to overlap each other.

  According to the vehicular lamp configured as described above, the visibility can be further improved by the light emitted from the plurality of plate-shaped light guides. In addition, a three-dimensionally expressed lamp can be realized.

  In the vehicular lamp of the present invention, in the second region portion of the plate-shaped light guide, at least a part of the second light guide is densely diffused as it approaches the exit surface from the entrance surface. Is preferably formed.

  According to the vehicular lamp having the above-described configuration, the light diffusing portion formed in the second light guide portion causes light that becomes brighter and darker as the distance from the incident surface is evenly and uniformly emitted on the surface of the second light guide portion. Can do.

  ADVANTAGE OF THE INVENTION According to this invention, the vehicle lamp which can improve the visibility of a lamp can be provided, suppressing the fall of the utilization efficiency of light.

It is a longitudinal section of the vehicular lamp concerning this embodiment. It is a schematic perspective view of the lamp unit which comprises a vehicle lamp. It is a schematic front view of the lamp unit which comprises a vehicle lamp. It is a figure which shows the lamp unit which comprises a vehicle lamp, Comprising: (a) is a horizontal sectional view of a lamp unit, (b) is the A section enlarged view in (a). It is a longitudinal cross-sectional view of the lamp unit which shows the optical path in a lamp unit. It is a photograph which shows the light emission state of the plate-shaped light guide in a lamp unit.

Hereinafter, an example of an embodiment of a vehicular lamp according to the present invention will be described with reference to the drawings.
FIG. 1 is a longitudinal sectional view of a vehicular lamp 10 according to the present embodiment. FIG. 2 is a schematic perspective view of the lamp unit 20 constituting the vehicular lamp 10. FIG. 3 is a schematic front view of the lamp unit 20 constituting the vehicular lamp 10.
As shown in FIG. 1, a vehicular lamp 10 according to this embodiment includes a lamp body 11 having an opening at the front, and a light-transmitting translucent cover 12 attached so as to cover the opening of the lamp body 11. ing. The vehicular lamp 10 is a tail lamp provided at the rear end of the vehicle.

  In this example, the front is the translucent cover 12 side (left direction in FIG. 1) of the vehicular lamp 10, and the rear is the lamp body 11 side (right direction in FIG. 1) opposite to the front. is there.

  The translucent cover 12 is attached to the lamp body 11 by being adhesively fixed. By attaching the translucent cover 12 to the lamp body 11, a sealed lamp chamber S is formed inside the vehicular lamp 10. A lamp unit 20 is accommodated in the lamp chamber S.

  As shown in FIGS. 1 to 3, the lamp unit 20 includes a support block 21, two light emitting portions 22 </ b> A and 22 </ b> B, and two plate-like light guides 23 </ b> A and 23 </ b> B.

  The support block 21 is formed from a synthetic resin and is supported by the lamp body 11. The support block 21 includes a base plate portion 31, a support plate portion 32 erected on the base plate portion 31, an upper surface plate portion 33 that extends from the upper end of the support plate portion 32 to the back side that is the rear side, and both side portions. And a side plate portion 34 provided. The support plate portion 32 has two light guide plate support portions 35. These light guide plate support portions 35 have support convex portions 36 extending to the back side of the support plate portion 32. The light guide plate support part 35 having the support convex part 36 is formed with an engagement window part 37 penetrating the front and back of the support plate part 32.

By forming the support convex part 36 in the light guide plate support part 35, the area where the inside of the engagement window part 37 and the outside of the plate light guides 23A and 23B come in contact increases, and the plate light guide 23A and 23B and the support plate part 32 are firmly fixed. Note that the support convex portion 36 may protrude forward with respect to the support plate portion 32.
The support plate portion 32 is made of an opaque resin. With this configuration, the rod-shaped light guide 42, the light source 41, and the like can be hidden from the front of the lamp. Alternatively, metal deposition or the like may be performed on the front surface of the support plate portion 32. In this configuration, the light leaked rearward from the plate-like light guides 23A and 23B can be reflected forward and guided forward, and the amount of light emitted to the front of the lamp can be increased.
In addition, although the example which comprises the support plate part 32 with opaque resin was demonstrated in this example, it is not restricted to this example. For example, the support plate portion 32 may be made of a transparent resin. According to this structure, the rod-shaped light guide 42 can be visually recognized from the front of the lamp, and the lamp can be viewed more three-dimensionally. Further, in the case of this configuration, the support plate portion 32 can be made to shine lightly by subjecting at least one of the front surface and the rear surface of the support plate portion 32 to diffusion processing such as embossing. Thereby, the irradiation area of a lamp can be increased and visibility can be improved.

  4A and 4B are diagrams showing the lamp unit 20 constituting the vehicular lamp 10, wherein FIG. 4A is a horizontal sectional view passing through the light emitting portion 22A of the lamp unit 20, and FIG. 4B is an enlarged view of a portion A in FIG. It is.

  As shown to (a) of FIG. 4, 22 A of light emission parts have the light source 41 and the rod-shaped light guide 42, and are arrange | positioned at the back surface side of the support plate part 32. As shown in FIG. The light source 41 is made of an LED (Light Emitting Diode) and is mounted on the circuit board 43. The rod-shaped light guide 42 is formed from a resin material having translucency, and is formed in a rod shape that extends while slightly curving.

  The rod-shaped light guide 42 is disposed at a position facing the engagement window 37 of the light guide plate support 35 (see FIG. 1). The rod-shaped light guide 42 has a reflection portion 42a on the opposite side to the engagement window portion 37. As shown in FIG. 4B, the reflection portion 42a of the rod-shaped light guide 42 extends in the extending direction. A plurality of steps 42b are formed along the line. In the light emitting unit 22A, light from the light source 41 enters from one end of the rod-shaped light guide 42, and the light passes through the rod-shaped light guide 42, is reflected in step 42b, and opposes the reflector 42a. The light is emitted from the emission part 42c.

  As shown in FIGS. 1 to 4, the plate-shaped light guide 23 </ b> A is formed from a resin material having translucency, and is formed in a plate shape. The plate-shaped light guide 23 </ b> A has an incident surface 51, a light guide portion 52, and an exit surface 53.

  The incident surface 51 is provided at the rear end of the plate-like light guide 23A, and is formed in a shape that is recessed in an arc shape in a longitudinal sectional view. The plate-like light guide 23 </ b> A has a rear end having an incident surface 51 inserted from the front side into an engagement window portion 37 formed on the light guide plate support portion 35 of the support block 21. Thereby, the plate-shaped light guide 23 </ b> A is supported by the support plate portion 32 of the support block 21, and the portion other than the rear end is disposed on the surface side of the support plate portion 32. In the plate-shaped light guide 23A supported by the support plate portion 32, the incident surface 51 is opposed to the emission portion 42c of the rod-shaped light guide 42 of the light emitting portion 22A. The light emitted from the emission part 42c of the light emitting part 22A is incident on the incident surface 51.

  The light guide 52 is composed of a plate-shaped portion of the plate-shaped light guide 23A, and the light guide 52 guides light incident on the incident surface 51 while reflecting the light from the front and back.

  The emission surface 53 is provided at the front end of the plate-like light guide 23A. The emission surface 53 is composed of the front end surface of the plate-like light guide 23 </ b> A, and emits the light guided by the light guide unit 52. The emission surface 53 is directed forward of the lamp, which is the rear side of the vehicle, and the light guided by the light guide unit 52 is emitted forward of the lamp.

  In the plate-shaped light guide 23 </ b> A, the light guide 52 includes a first light guide 61 and a second light guide 62. The first light guide 61 is formed in a substantially flat plate shape. The second light guide part 62 includes a curved part 63 that is twisted with respect to the first light guide part 61 and is inclined more downward than the first light guide part 61 with respect to the front-rear direction.

  The plate-shaped light guide 23A is disposed so that the incident surface 51 and the output surface 53 face each other, and the portion where the light guided by the first light guide unit 61 is output from the output surface 53 is the first region portion. 71. Further, the plate-shaped light guide 23A is a portion formed continuously adjacent to the first region portion 71, and light guided by the second light guide portion 62 including the curved portion 63 is received. A portion emitted from the surface of the second light guide 62 is a second region portion 72.

  A light diffusion portion 64 is formed in the second region portion 72 of the plate-like light guide 23A. The light diffusing portion 64 is provided by forming a total reflection step, a V-groove or a dot on the back surface of the bending portion 63, and is formed densely as it approaches the exit surface 53 from the entrance surface 51. Note that the light diffusion portion 64 may be formed on the surface of the bending portion 63. The plate-shaped light guide 23B has the same configuration as the plate-shaped light guide 23A. The plate-like light guides 23A and 23B are arranged such that a part of each of the second region portions 72 of the plate-like light guides 23A and 23B overlap each other when viewed from the front of the lamp.

  FIG. 5 is a longitudinal sectional view of the lamp unit 20 showing an optical path in the lamp unit 20. FIG. 6 is a photograph showing the light emission state of the plate-shaped light guides 23A and 23B in the lamp unit 20.

  In the vehicular lamp 10 having the structure described above, when the light source 41 of the light emitting units 22A and 22B of the lamp unit 20 is turned on, the light from the light source 41 enters from one end of the rod-shaped light guide 42 as shown in FIG. Then, the light passes through the rod-shaped light guide 42, is reflected at step 42b, and is emitted from the emission part 42c.

  The light emitted from the emission part 42c of the bar-shaped light guide 42 of the light emitting parts 22A and 22B is incident on the incident surface 51 of the plate-like light guides 23A and 23B, and is emitted while being reflected by the front and back surfaces of the light guide part 52. The light is guided to the surface 53 and emitted toward the front of the lamp from the emission surface 53 (see L1 in FIG. 5). In the second region portion 72 of the plate-like light guides 23A and 23B, part of the light guided by the second light guide portion 62 is diffused by the light diffusion portion 64 of the curved portion 63 and emitted from the surface. (See L2 in FIG. 5). As a result, as shown in FIG. 6, in the vehicular lamp 10, the emission surface 53 formed from the front ends of the plate light guides 23A and 23B appears to shine, and the second light guide of the plate light guides 23A and 23B. The curved part 63 of the part 62 appears to shine.

  As described above, according to the vehicular lamp 10 according to the embodiment, in the first region portion 71 of the plate-shaped light guides 23A and 23B, the light guided by the first light guide unit 61 The light is emitted from the opposite emission surface 53. For this reason, the light from the light emitting units 22A and 22B can be used efficiently.

  In addition, in the second region portion 72 of the plate-shaped light guides 23 </ b> A and 23 </ b> B, the light guided by the second light guide unit 62 is emitted from the surface of the bending unit 63. For this reason, surface light can be emitted in an area wider than the emission surface 53, and visibility can be improved.

  In this way, by forming the curved portion 63 in a part of the plate-like light guides 23A and 23B to emit light, the visibility of the lamp is improved while suppressing a decrease in light use efficiency. Can do.

  In the plate-like light guides 23 </ b> A and 23 </ b> B, strong light is emitted from the emission surface 53 having an edge, and relatively weak light is emitted from the surface of the curved portion 63. Therefore, the combination of the emission of these lights can enhance the intensity of the emitted light in addition to the improvement of the visibility, and for example, the flow can be expressed by the emission surface 53 that shines strongly and extends in the left-right direction of the lamp. Thus, the design freedom of the design property of the whole light emission area | region can be improved.

  Moreover, since the emission surface 53 emits the light guided by the light guide 52 toward the front of the lamp in both the first region portion 71 and the second region portion 72, the light from the light emitting portions 22A and 22B. Can be used more efficiently. Moreover, in the 2nd area | region part 72, the design can be improved by attaching strength with the emitted light from the surface of the 2nd light guide part 62, and the emitted light from the output surface 53. FIG.

  Further, by using the rod-shaped light guide 42 as the light emitting portions 22A and 22B, uniform and less uneven light can be incident on the plate light guides 23A and 23B. In addition, the number of light sources can be reduced and the cost can be reduced compared to a configuration in which a plurality of light sources are arranged in parallel along the incident surfaces 51 of the plate-like light guides 23A and 23B.

  Further, when viewed from the front of the lamp, at least a part of each of the second region portions 71 of the two plate-shaped light guides 23A and 23B is disposed so as to overlap each other, and thus the two plate-shaped light guides 23A and 23B. Visibility can be further improved by light emitted from the lamp, and a three-dimensionally expressed lamp can be realized.

  Furthermore, since the light diffusing portion 64 is formed densely in the second region portion 71 of the plate-like light guides 23A and 23B from the incident surface 51 toward the exit surface 53, the light diffusing portion 64 causes the incident surface 51 to Light that becomes darker as it gets closer and farther away can be emitted uniformly and uniformly on the surface of the second light guide unit 62.

  In the above-described embodiment, the light source 41A is used as the light emitting unit 22A and 22B that is incident on the rod-shaped light guide 42 and is emitted from the emission unit 42c of the rod-shaped light guide 42. The portions 22A and 22B may have other structures. For example, as the light emitting units 22A and 22B, a light source composed of a plurality of LEDs or the like may be arranged in parallel along the incident surface 51 of the plate-like light guides 23A and 23B, or an organic EL (Electro Luminescence) or the like may be disposed along the incident surface 51 of the plate-like light guides 23A and 23B.

  Moreover, in the said embodiment, although two plate-shaped light guides 23A and 23B were provided, the number of plate-shaped light guides is not restricted to two, Three or more may be sufficient.

10: vehicle lamp, 22A, 22B: light emitting unit, 23A, 23B: plate-shaped light guide, 41: light source, 42: rod-shaped light guide, 42a: emitting unit, 51: incident surface, 52: light guiding unit, 53: outgoing surface, 61: first light guide, 62: second light guide, 63: curved part, 64: light diffusion part, 71: first region part, 72: second region part

Claims (5)

A light emitting unit;
An incident surface on which the light emitted from the light emitting unit is incident, a plate-shaped light guiding unit that guides the light incident on the incident surface, and an emission that emits the light guided by the light guiding unit A plate-like light guide having a surface, the incident surface provided at the rear end, and the output surface provided at the front end;
With
The plate-shaped light guide is
The light guide part includes a first light guide part and a second light guide part,
A first region portion that is arranged so that the incident surface and the emission surface face each other, and the light guided by the first light guide portion is emitted from the emission surface;
A portion formed continuously adjacent to the first region portion, wherein the second light guide portion includes a curved portion inclined more greatly than the first light guide portion in the front-rear direction; A second region where light guided by the second light guide is emitted from at least a part of the surface of the second light guide;
A vehicular lamp.   The said output surface is comprised so that the light guided by the said light guide part may be radiate | emitted toward a lamp front in both the said 1st area | region part and the said 2nd area | region part. Vehicle lamp.   The light emitting unit is a rod-shaped light guide extending along a predetermined extending direction, and is formed along the extending direction while allowing light emitted from a light source to enter from one end and guiding the light inside. The vehicular lamp according to claim 1, wherein the vehicular lamp is arranged so as to emit light from the emitted portion toward the incident surface of the plate-shaped light guide. A plurality of the plate light guides are provided,
The at least one part of each said 2nd area | region part of each of the said some plate-shaped light guides is arrange | positioned so that it may mutually overlap, seeing from the lamp front, The Claim 1 WHEREIN: Vehicle lamp.   The light diffusing part is formed densely in at least a part of the second light guide part from the incident surface toward the emission surface in the second region portion of the plate-like light guide. The vehicular lamp according to any one of claims 1 to 4.