JP2018156868A - Vehicular lighting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lamp for a vehicle capable of suppressing the occurrence of uneven brightness at a joint portion of light guide members arranged in a line. SOLUTION: One surface 3a on the tip end side of a first light guide member 3 and another surface 5b on the base end side of a second light guide member 5 are arranged so as to face each other, whereby a first light emission is emitted. The first light emitting body 4 and the second light emitting body 6 are provided linearly side by side so that the joint portion T between the surface and the second light emitting surface forms a continuous light emitting surface. It has a shape in which the distance C between one surface 3a of the first light guide member 3 and the other surface 5b of the second light guide member 5 facing each other is constant. [Selection diagram] Fig. 5

Description

  The present invention relates to a vehicular lamp.

  Conventionally, as a vehicular lamp mounted on a vehicle, a combination of a light source such as a light emitting diode (LED) and a long light guide member (light guide) is known (for example, the following patent document). 1).

  In the vehicular lamp, the light emitted from the light source is incident from the base end side of the light guide member, and the light is guided toward the distal end side of the light guide member while repeating reflection inside the light guide member. By emitting light reflected by a plurality of reflection cuts provided on one surface of the light guide member from the other surface of the light guide member, the light emitting surface provided on the other surface side of the light guide member is caused to emit light in a line shape. . Such vehicular lamps are used in, for example, daytime running lamps (DRL) (hereinafter referred to as DRL), tail lamps, and the like.

  Moreover, in the vehicle lamp described in Patent Document 1 below, a part of the rod-shaped second light guide is arranged so as to overlap in the emission direction of a part of the emission surface of the rod-shaped first light guide. In addition, a diffusion step for diffusing light from a part of the first light guide is formed on a part of the emission surface of the second light guide that overlaps with a part of the first light guide.

  Thereby, the light emission width of the portion where the first light guide and the second light guide overlap (joint portion) can be enlarged, and the light emission width similar to or close to that of the other portions can be obtained. ing.

JP2015-204275A

  By the way, in the vehicle lamp described in Patent Document 1 described above, the cross-sectional shape (cross-sectional shape orthogonal to the axial direction) of each other is circular at the joint portion between the first light guide and the second light guide. It has become.

  In this case, in the joint portion between the first light guide and the second light guide, the surfaces facing each other are convex. Therefore, light leaks out from the central part (topmost part) of these convex surfaces without being diffused. On the other hand, the distance between the convex surfaces facing each other changes from the center to the outside. For this reason, there has been a problem that luminance unevenness occurs at the joint portion between the first light guide and the second light guide.

  The present invention has been proposed in view of such conventional circumstances, and provides a vehicular lamp that can suppress the occurrence of luminance unevenness at a joint portion of light guide members arranged in a line. For the purpose.

In order to achieve the above object, the present invention provides the following means.
[1] A first light source and a long first light guide member, and light emitted from the first light source is incident from a proximal end side of the first light guide member, A plurality of reflection cuts provided on one surface of the first light guide member while guiding light toward the distal end side of the first light guide member while repeating reflection inside the one light guide member The first light emitter that emits the first light emitting surface provided on the other surface side of the first light guide member by emitting the light reflected by the other surface of the first light guide member When,
A second light source and a long second light guide member, and the light emitted from the second light source is incident from the base end side of the second light guide member, and the second light guide While repeatedly reflecting inside the optical member, the light is guided toward the distal end side of the second light guide member and reflected by a plurality of reflection cuts provided on one surface of the second light guide member. A second light emitter that emits a second light emitting surface provided on the other surface side of the second light guide member by emitting the emitted light from the other surface of the second light guide member. ,
The first light-emitting surface and the second light-guiding member are disposed so that one surface on the distal end side of the first light-guiding member and the other surface on the proximal end side of the second light-guiding member are opposed to each other. The first light emitter and the second light emitter are arranged in a line so that a joint portion with the light emitting surface forms a continuous light emitting surface,
The vehicular lamp, wherein the joint portion has a shape in which an interval between the one surface of the first light guide member and the other surface of the second light guide member is constant.
[2] In the joint portion, a plane that forms one surface of the first light guide member and a plane that forms the other surface of the second light guide member have shapes that are parallel to each other. The vehicular lamp according to [1].
[3] In the joint portion, a concave surface that forms one surface of the first light guide member and a convex surface that forms the other surface of the second light guide member have a concentric arc shape. The vehicular lamp according to [1], characterized in that it is characterized in that
[4] The shape of the first light guide member continuously changed between the convex surface forming the other surface and the flat surface so that the convex surface forming the other surface becomes a flat surface in the joint portion. It has a shape, The vehicle lamp as described in any one of said [1]-[3] characterized by the above-mentioned.
[5] The vehicular lamp according to any one of [1] to [3], wherein the first light guide member has a shape in which the other surface is a convex surface.
[6] The first light guide member includes a flat surface forming the one surface and a pair of concave surfaces located on both sides of the flat surface in a portion other than the joint portion, and forms the one surface. The vehicular lamp according to any one of [1] to [5], wherein the flat surface is narrower than the other surface.
[7] As described in any one of [1] to [5], the first light guide member has a shape in which the one surface is a convex surface in a portion other than the joint portion. Vehicle lamp.
[8] The second light guide member has a flat surface forming the one surface and a pair of concave surfaces positioned on both sides of the flat surface, and the flat surface forming the one surface is more than the other surface. The vehicular lamp according to any one of [1] to [7], wherein the vehicular lamp has a narrow shape.
[9] As described in any one of [1] to [7], the second light guide member has a shape in which the one surface is a convex surface in a portion other than the joint portion. Vehicle lamp.
[10] The first light guide member and / or the second light guide member have a shape in which a distance between the one surface and the other surface is gradually narrowed from the base end side toward the tip end side. The vehicular lamp according to any one of [1] to [9].

  As described above, according to the present invention, it is possible to provide a vehicular lamp that can suppress the occurrence of luminance unevenness at the joint portion of the light guide members arranged in a line.

It is a perspective view showing composition of a vehicular lamp concerning one embodiment of the present invention. It is the perspective view which expanded the joint part of the 1st light guide member with which the vehicle lamp shown in FIG. 1 is equipped, and the 2nd light guide member. It is a top view of the joint part shown in FIG. It is a side view of the joint part shown in FIG. It is the cross-sectional view which cut | disconnected the seam part shown in FIG. It is a cross-sectional view which shows the modification of the joint part shown in FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
In the drawings used in the following description, in order to make each component easy to see, the scales of the dimensions may be different depending on the component, and the dimensional ratio of each component is not always the same as the actual. Absent.

  First, as an embodiment of the present invention, for example, a vehicle lamp 1 shown in FIGS. 1 to 5 will be described. FIG. 1 is a side view showing the configuration of the vehicular lamp 1. FIG. 2 is an enlarged perspective view of a joint portion T between the first light guide member 3 and the second light guide member 5 included in the vehicular lamp 1. 3 is a top view of the joint portion T shown in FIG. FIG. 4 is a side view of the seam portion T shown in FIG. FIG. 5 is a cross-sectional view of the seam portion T shown in FIG.

  In the drawings shown below, an XYZ orthogonal coordinate system is set, the X-axis direction is the front-rear direction (length direction) of the vehicle lamp, the Y-axis direction is the left-right direction (width direction) of the vehicle lamp, and the Z-axis direction. Are shown as the vertical direction (height direction) of the vehicular lamp 1.

  The vehicular lamp 1 according to the present embodiment is, for example, one in which the present invention is applied to a DRL that is mounted at both corners on the front end side of a vehicle (not shown) (in this embodiment, the corner portion on the right front end side). It is. In the following description, “front”, “rear”, “left”, “right”, “upper”, and “lower” refer to when the vehicle lamp 1 is viewed from the front (front of the vehicle) unless otherwise specified. Means the respective directions.

  Specifically, the vehicular lamp 1 includes a first light emitter 4 including a first light source 2a, a long first light guide member 3, a second light source 2b, and a long first light source 2b. And a second light emitter 6 including two light guide members 5. The first light emitter 4 and the second light emitter 6 are accommodated inside a lamp body (not shown) constituting the vehicular lamp 1 and are provided at a corner portion on the right front end side of the vehicle. Has been placed.

  The first light source 2a and the second light source 2b are, for example, chip LEDs (SMD LEDs) that emit white light (hereinafter simply referred to as light). Moreover, the high power (high brightness) type thing for vehicle illumination is used for chip LED. The first and second light sources 2 a and 2 b emit light L radially toward the first and second light guide members 3 and 5.

  The first light guide member 3 and the second light guide member 5 are used as inner lenses of the vehicular lamp 1 from rod-shaped light guides disposed in front of the first light source 2a and the second light source 2b, respectively. Become. The first light guide member 3 and the second light guide member 5 may be made of a material having a refractive index higher than that of air, for example, a transparent resin such as polycarbonate or acrylic, or glass.

  The first light emitter 4 is incident on the light emitted from the first light source 2 a from the proximal end side of the first light guide member 3, and repeatedly reflects inside the first light guide member 3. While guiding light toward the front end side of one light guide member 3, the light reflected by the plurality of reflection cuts 7 a provided on the back surface (one surface) 3 a of the first light guide member 3 is the first. By emitting light from the surface (other surface) 3b of the light guide member 3, the first light emitting surface S1 provided on the surface 3b side of the first light guide member 3 is caused to emit light in a line shape.

  Similarly, the second light emitter 6 makes the light emitted from the second light source 2 b incident from the base end side of the second light guide member 5 and repeats reflection inside the second light guide member 5. However, the light is guided toward the distal end side of the second light guide member 5 and the light reflected by the plurality of reflection cuts 7b provided on the back surface (one surface) 5a of the second light guide member 5 is reflected. By emitting from the surface (other surface) 5b of the second light guide member 5, the second light emitting surface S2 provided on the surface 5b side of the second light guide member 5 is caused to emit light in a line shape.

  Note that the plurality of reflection cuts 7a and 7b are configured so that the light incident on the back surfaces 3a and 5a of the first light guide member 3 and the second light guide member 5 is the first light guide member 3 and the second light guide member. The shape, size, number, and the like are not particularly limited as long as the light is reflected at an angle that is less than the critical angle with respect to the surfaces 3b and 5b. For example, in the reflective cuts 7a and 7b of the present embodiment, grooves having a substantially triangular cross section extend in the width direction and are arranged in the axial direction (length direction) of the first and second light guide members 3 and 5. It is constituted by.

  In the vehicular lamp 1 according to the present embodiment, the rear surface 3a on the distal end side of the first light guide member 3 and the surface 5b on the proximal end side of the second light guide member are arranged to face each other, When the vehicular lamp 1 is viewed from the front side, the first light emitter 4 and the first light emitter 4 and the seam portion T of the first light emitting surface S1 and the second light emitting surface S2 form a continuous light emitting surface. The second light emitters 6 are provided in a line.

  Further, the first light guide member 3 and the second light guide member 5 are opposed to each other between the back surface 3a of the first light guide member 3 and the surface 5b of the second light guide member 5 at the joint portion T. It has a cross-sectional shape in which the interval C is constant.

  Specifically, in the present embodiment, the first light guide member 3 has a substantially cylindrical cross-sectional shape, and toward the joint portion T so that the cross-sectional shape of the joint portion T is rectangular. The shape has a continuously changing shape. That is, the first light guide member 3 has a shape in which the shape is continuously changed between the convex surface forming the surface 3b and the flat surface so that the convex surface forming the surface 3b becomes a flat surface at the joint portion T. Have.

  Further, the first light guide member 3 has a flat surface that forms the back surface 3a and a pair of concave surfaces 8a located on both sides of the flat surface at portions other than the joint portion T, and forms the back surface 3a. The plane to be formed has a shape that is narrower than the surface 3b. The reflection cut 7a is provided on a plane that forms the back surface 3a, and reflects (totally) light incident on the back surface 3a toward the front surface 3b (first light emitting surface S1).

  In the vehicular lamp 1 of the present embodiment, by adopting such a shape on the back surface 3a side in the first light guide member 3, from the proximal end side to the distal end side of the first light guide member 3. It is possible to guide the guided light more toward the tip side, and more efficiently reflect the light incident on the back surface 3a toward the front surface 3b (first light emitting surface S1).

  The upper surface 3c and the lower surface 3d of the first light guide member 3 form a plane parallel to each other. Moreover, the 1st light guide member 3 has a shape where the space | interval (thickness) of the back surface 3a and the surface 3b becomes narrow gradually toward the front end side from a base end side.

  On the other hand, in the present embodiment, the second light guide member 5 has a substantially cylindrical cross-sectional shape, and the shape of the second light-guiding member 5 toward the joint portion T is such that the cross-sectional shape of the joint portion T is rectangular. It has a continuously changing shape. That is, the second light guide member 5 has a shape in which the shape is continuously changed between the convex surface forming the surface 5b and the flat surface so that the convex surface forming the surface 5b becomes a flat surface at the joint portion T. Have.

  The second light guide member 5 has a plane that forms the back surface 5a and a pair of concave surfaces 8b that are located on both sides of the plane, and the plane that forms the back surface 5a is wider than the surface 5b. It has a narrow shape. The reflection cut 7b is provided on a plane that forms the back surface 5a, and reflects (totally) light incident on the back surface 5a toward the front surface 5b (second light emitting surface S2).

  In the vehicular lamp 1 of the present embodiment, by adopting such a shape on the back surface 5a side in the second light guide member 5, from the proximal end side to the distal end side of the second light guide member 5. The light that is guided can be guided to the front end side, and the light incident on the back surface 5a can be reflected more efficiently toward the front surface 5b (second light emitting surface S2).

  The upper surface 5c and the lower surface 5d of the second light guide member 5 form a plane parallel to each other. Moreover, the 2nd light guide member 5 has a shape where the space | interval (thickness) of the back surface 5a and the surface 5b becomes narrow gradually toward the front end side from the base end side. Further, the second light guide member 5 has a shape in which the base end side with respect to the joint portion T is curved toward the direction away from the first light guide member 3 (the back side of the vehicular lamp 1). ing.

  In the vehicular lamp 1 of the present embodiment having the above-described configuration, the first light emitting surface S1 (first light guide member 3) and the second light emitting surface S2 (first light guide member 3) described above. In the joint portion T, the plane that forms the back surface 3a of the first light guide member 3 and the plane that forms the surface 5b of the second light guide member 5 have shapes that are substantially the same width and parallel to each other. ing.

  In this case, in the joint portion T, the distance C between the back surface 3a of the first light guide member 3 and the front surface 5b of the second light guide member 5 is constant. Thereby, it is possible to prevent light from leaking nonuniformly between the back surface 3 a of the first light guide member 3 and the surface 5 b of the second light guide member 5.

  As described above, in the vehicular lamp 1 according to the present embodiment, it is possible to suppress the occurrence of luminance unevenness at the joint portion T between the first light emitting surface S1 and the second light emitting surface S2. In addition, since the first light emitting surface S1 and the second light emitting surface S2 form a continuous light emitting surface at the joint portion T, it is possible to perform line-like light emission with good appearance.

In addition, this invention is not necessarily limited to the thing of the said embodiment, A various change can be added in the range which does not deviate from the meaning of this invention.
Specifically, in the above-described embodiment, the surface portion 3b of the first light guide member 3 is formed by a flat surface in the joint portion T described above. For example, as illustrated in FIG. In the joint portion T, the surface 3b of the first light guide member 3 can be formed as a convex surface.

  Moreover, in the said embodiment, in the joint part T mentioned above, the plane which forms the back surface 3a of the 1st light guide member 3, and the plane which forms the surface 5b of the 2nd light guide member 5 are mutually parallel. For example, as shown in FIG. 6B, a concave surface forming the back surface 3a of the first light guide member 3 and the second light guide member are formed at the joint portion T. It is good also as a structure which has the shape where the convex surface which forms the surface 5b of 5 becomes a concentric circular arc shape mutually.

  Moreover, the 2nd light guide member 5 has the shape from which the back surface 5a becomes a convex surface by having circular cross-sectional shape. On the other hand, although not shown, the first light guide member 3 may have a configuration in which the back surface 3a has a convex surface in a portion other than the joint portion T.

  Also in this case, the distance C between the back surface 3a of the first light guide member 3 and the front surface 5b of the second light guide member 5 is constant. Thereby, it is possible to prevent light from leaking nonuniformly between the back surface 3 a of the first light guide member 3 and the surface 5 b of the second light guide member 5.

  Therefore, even when such a shape is adopted, similarly to the vehicular lamp 1, it is possible to suppress the occurrence of luminance unevenness at the joint portion T between the first light emitting surface S1 and the second light emitting surface S2. Is possible. In addition, since the first light emitting surface S1 and the second light emitting surface S2 form a continuous light emitting surface at the joint portion T, it is possible to perform line-like light emission with good appearance.

  In the above-described embodiment, the above-described LEDs are used as the first and second light sources 2a and 2b. However, in addition to the LEDs, for example, a light-emitting element such as a laser diode (LD) is used. Can do. Further, the number of the first and second light sources 2a and 2b to be arranged is not particularly limited, and is not limited to the configuration in which the LEDs are arranged one by one, but the first and second light sources 2a and 2b It is good also as a structure which has arrange | positioned several LED for every 2b.

  Further, the color of light emitted from the first and second light sources 2a and 2b is not limited to the above-described white light but is used for the first and second light sources 2a and 2b such as red light and orange light. It is also possible to change as appropriate.

  Moreover, in the said vehicle lamp 1, it is possible to change suitably the shape etc. of the said 1st and 2nd light guide members 3 and 5 according to the design etc. of an actual vehicle. For example, the first and second light guide members 3 and 5 may have a shape branched from the middle thereof. In this case, a configuration in which the second light guide member 5 is spliced to the branched front end side of the first light guide member 3 or a second light guide spliced to the front end side of the first light guide member 3. The member 5 can be branched. Furthermore, in the said vehicle lamp 1, the joint part T is one, However, By increasing the joint part T, it is also possible to further increase the number of the light guide members (light-emitting body) joined together.

  In the above embodiment, the case where the present invention is applied to the above-described DRL is illustrated. However, when the DRL is configured, the first and second light sources 2a and 2b and the first and second inner lenses described above are used. In addition to the light guide members 3 and 5, for example, it is possible to combine with other members such as an extension, an outer lens, and a reflector.

  The vehicle lamp to which the present invention is applied is not limited to the DRL described above. For example, a vehicle headlamp (head lamp), a vehicle width lamp (position lamp), and an auxiliary headlamp (sub headlamp) are used. , Front (rear) fog lights (fog lights), tail lights (tail lights), lid lights, brake lights (stop lights), back lights, turn indicators (winker lights), etc. The present invention can be applied to a wide range of lamps.

  DESCRIPTION OF SYMBOLS 1 ... Vehicle lamp 2a ... 1st light source 2b ... 2nd light source 3 ... 1st light guide member 3a ... Back surface (one surface) 3b ... Front surface (other surface) 4 ... 1st light-emitting body 5 ... 2nd Light guide member 5a ... Back surface (one surface) 5b ... Front surface (other surface) 6 ... Second light emitter 7a, 7b ... Reflection cut 8a, 8b ... Concave surface S1 ... First light emitting surface S2 ... Second light emitting surface T ... Seam part C ... interval

Claims (10)

A first light source and a long first light guide member, the light emitted from the first light source is incident from a proximal end side of the first light guide member, and the first light guide While repeating reflection inside the optical member, the light is guided toward the distal end side of the first light guide member and reflected by a plurality of reflection cuts provided on one surface of the first light guide member. A first light emitter that emits a first light emitting surface provided on the other surface side of the first light guide member by emitting the light from the other surface of the first light guide member;
A second light source and a long second light guide member, and the light emitted from the second light source is incident from the base end side of the second light guide member, and the second light guide While repeatedly reflecting inside the optical member, the light is guided toward the distal end side of the second light guide member and reflected by a plurality of reflection cuts provided on one surface of the second light guide member. A second light emitter that emits a second light emitting surface provided on the other surface side of the second light guide member by emitting the emitted light from the other surface of the second light guide member. ,
The first light-emitting surface and the second light-guiding member are disposed so that one surface on the distal end side of the first light-guiding member and the other surface on the proximal end side of the second light-guiding member are opposed to each other. The first light emitter and the second light emitter are arranged in a line so that a joint portion with the light emitting surface forms a continuous light emitting surface,
The vehicular lamp, wherein the joint portion has a shape in which an interval between the one surface of the first light guide member and the other surface of the second light guide member is constant.   The flat surface forming one surface of the first light guide member and the flat surface forming the other surface of the second light guide member in the joint portion have shapes parallel to each other. Item 2. A vehicle lamp according to Item 1.   In the joint portion, a concave surface that forms one surface of the first light guide member and a convex surface that forms the other surface of the second light guide member have a concentric arc shape. The vehicular lamp according to claim 1.   The first light guide member has a shape in which the shape is continuously changed between the convex surface forming the other surface and the flat surface so that the convex surface forming the other surface becomes a flat surface in the joint portion. The vehicular lamp according to any one of claims 1 to 3.   The vehicular lamp according to any one of claims 1 to 3, wherein the first light guide member has a shape in which the other surface is a convex surface.   The first light guide member has a flat surface forming the one surface and a pair of concave surfaces located on both sides of the flat surface in a portion other than the joint portion, and the flat surface forming the one surface is The vehicular lamp according to any one of claims 1 to 5, wherein the vehicular lamp has a shape that is narrower than the other surface.   The vehicular lamp according to any one of claims 1 to 5, wherein the first light guide member has a shape in which the one surface is a convex surface in a portion other than the joint portion.   The second light guide member has a flat surface forming the one surface and a pair of concave surfaces located on both sides of the flat surface, and the flat surface forming the one surface is narrower than the other surface. The vehicular lamp according to any one of claims 1 to 7, wherein the vehicular lamp has a shape as follows.   The vehicular lamp according to any one of claims 1 to 7, wherein the second light guide member has a shape in which the one surface is a convex surface in a portion other than the joint portion.   The first light guide member and / or the second light guide member have a shape in which an interval between the one surface and the other surface is gradually narrowed from a proximal end side toward a distal end side. Item 10. The vehicular lamp according to any one of Items 1 to 9.

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