JP2016152142A - Vehicular lighting fixture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicular lighting fixture capable of performing surface light emission of a wide range without increasing an outer diameter.SOLUTION: In a rear combination lamp (vehicular lighting fixture) 1 which includes a first light guide body 9 and a second light guide body 10 for emitting light by reflecting light by light guide cuts 9a, 10a formed on a rear surface and emitting it from an emission surface on a front side, in a process of guiding the light entering from an LED (light source) in a longitudinal direction, the second light guide body 10 is constituted by a columnar bar-like part 10A and a plane part 10B extending integrally from the bar-like part 10A, and a light guide cut 10b and a crimp are formed on a rear surface of the plane part 10B. The LED is arranged in the vicinity of one end in the longitudinal direction of the bar-like part 10A of the second light guide body 10, and the plane part 10B of the second light guide body 10 is extended in the direction orthogonal to the light emission direction, at the longitudinal direction other end part of the bar-like part 10A.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicular lamp including a light guide that emits light in the process of guiding light incident from a light source in a longitudinal direction.

  In recent years, an increasing number of vehicular lamps use LEDs (light emitting diodes) with high luminous efficiency and long life as light sources. For example, for tail lamps and the like arranged on the left and right of the rear part of the vehicle, light having a high directivity emitted from the LED is incident on the light guide, and the light incident on the light guide is totally reflected in the longitudinal direction. In the process of guiding the light, a part of the light is reflected by the light guide cut formed on the back surface (the surface opposite to the light emitting surface) of the light guide and emitted from the front emitting surface. The whole body is made to emit light (for example, refer to Patent Document 1).

  By the way, the round bar-shaped light guide 110 which shows the cross-sectional shape in FIG. 5 is exclusively used for the light guide provided in the vehicle lamp. The light guide 110 is long in the direction perpendicular to the paper surface of FIG. 5, and a light guide cut 110a is provided in the longitudinal direction (FIG. 5) on the flat back surface (the surface opposite to the light emitting surface on the front side). In the direction perpendicular to the paper surface).

  In such a light guide 110, when light emitted from an LED (not shown) opposed to the longitudinal end portion thereof enters the light guide 110 from the entrance surface of the longitudinal end portion, the light is In the process of proceeding in the longitudinal direction while repeating total reflection inside the light guide 110, a part of the light is reflected by the light guide cut 110 a formed on the back surface of the light guide 110 and is reflected on the front side of the light guide 110. Since the light is emitted from the emission surface to the outside, the entire light guide 110 emits light uniformly.

JP2013-191212A

  However, the conventional light guide 110 having the cross-sectional shape shown in FIG. 5 basically emits light in the form of a thin rod, and it is necessary to increase its outer diameter in order to emit light over a wide range. There is a problem that the installation space of the light body 110 becomes large.

  In addition, there is also a problem that if a wide range is shined with the bent shape portion of the conventional rod-shaped light guide 110, the center portion becomes darker than the outside.

  The present invention has been made in view of the above problems, and an object thereof is to provide a vehicular lamp that can emit light over a wide range without increasing the outer diameter.

  In order to achieve the above object, according to the first aspect of the present invention, in the process of guiding the light incident from the light source in the longitudinal direction, the light is reflected by the light guide cut formed on the back surface and emitted from the light exit surface on the front side. In the vehicular lamp provided with the light guide that emits light, the light guide is configured by a cylindrical rod-shaped portion and a plane portion integrally extending from the rod-shaped portion, and is guided to the back surface of the plane portion. It is characterized by the formation of light cuts and wrinkles.

  The invention according to claim 2 is the invention according to claim 1, wherein the light source is arranged in the vicinity of one end in the longitudinal direction of the rod-shaped portion of the light guide, and the planar portion of the light guide is arranged in the longitudinal direction of the rod-shaped portion, etc. It is characterized in that the end portion extends in a direction orthogonal to the light emitting direction.

  According to the present invention, the light incident on the rod-shaped portion of the light guide from the light source travels in the longitudinal direction while totally reflecting the inside of the rod-shaped portion, and the light guide cut formed on the back surface of the rod-shaped portion. And is emitted from the light emitting surface on the front side of the rod-shaped portion to the outside, so that the entire rod-shaped portion emits light. In addition, a part of the light traveling inside the rod-shaped portion of the light guide is incident on the flat portion from the rod-shaped portion, and is reflected and diffused by the light guide cut and wrinkle formed on the back surface of the flat portion. Since the light is emitted from the light emission surface to the outside, the plane portion emits light.

  As described above, according to the vehicular lamp according to the present invention, the planar portion emits surface light along with the rod-shaped portion of the light guide. Therefore, a wide range of surface light can be emitted without increasing the outer diameter of the rod-shaped portion. it can.

1 is a front view of a vehicular lamp according to the present invention. It is a front view of the 2nd light guide of the vehicle lamp which concerns on this invention. It is the sectional view on the AA line of FIG. FIG. 3 is a sectional view taken along line B-B in FIG. 2. It is a cross-sectional view of a conventional light guide.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 is a front view of a vehicular lamp according to the present invention, FIG. 2 is a front view of a second light guide of the vehicular lamp, FIG. 3 is a cross-sectional view taken along line AA in FIG. 2, and FIG. FIG. 2 is a cross-sectional view taken along line BB, and the vehicular lamp 1 according to the present embodiment is a rear combination lamp disposed on the left and right of the rear portion of the vehicle. Since the left and right rear combination lamps 1 are symmetrical and have the same basic configuration, only one (left side) rear combination lamp 1 will be illustrated and described below.

  A rear combination lamp 1 shown in FIG. 1 includes a turn signal lamp 3, a stop lamp 4, and a tail lamp as lamp units having different functions in a lamp chamber defined by a transparent outer lens (not shown) that covers a housing 2 and its opening. 5 is accommodated.

  As shown in FIG. 1, the turn signal lamp 3 and the stop lamp 4 are arranged side by side in a front view. The turn signal lamp 3 receives a bulb 6 as a light source and light from the bulb 6. A reflector 7 is provided to reflect the vehicle rearward (front side in FIG. 1). The stop lamp 4 includes five LEDs (not shown) as light sources and a total of five hexagonal inner lenses 8 that transmit light from each LED while diffusing.

  The tail lamp 5 includes a first light guide body 9 and a second light guide body 10 which are disposed above and below the turn signal lamp 3 and the stop lamp 4 in the lateral direction, and the first light guide body 9 and the second light guide body 10. An LED (not shown) is provided as a light source for causing each of the light bodies 10 to emit light.

  The first light guide body 9 and the second light guide body 10 are made of a transparent resin having a high light guide property, and the first light guide body 9 is formed in the shape of a round bar that is long in the lateral direction. On the incident surface at one end in the longitudinal direction (left end in FIG. 1 (vehicle outer side)), an LED (not shown) is disposed to face. And the front of this 1st light guide 9 comprises the output surface, and the light guide cut not shown is continuously formed in the longitudinal direction at the back surface on the opposite side to this output surface. .

  Thus, in the first light guide 9, when an electric current is supplied to the LED (not shown) disposed opposite to the incident surface at one end in the longitudinal direction and the LED emits light, the light is emitted from the first light guide 9. The light enters the first light guide 9 from the incident surface at one end in the longitudinal direction. Then, the light incident on the inside of the first light guide 9 travels in the longitudinal direction (right side (vehicle inside) in FIG. 1) while repeating total reflection inside the first light guide 9. It is formed on the back surface of the first light guide 9 and is reflected by a light guide cut (not shown) to be emitted from the front emission surface to the outside toward the rear of the vehicle. As a result, the entire first light guide 9 emits light.

  On the other hand, the second light guide 10 is viewed from above in a round bar-like portion 10A extending in the lateral direction and at the longitudinal end of the rod-like portion 10A (the right end portion (vehicle inside) in FIG. 1). It is comprised by the flat plane part 10B integrally extended diagonally upward. Here, as shown in FIG. 3 and FIG. 4, the rod-shaped portion 10 </ b> A is formed as a round bar having a substantially circular cross section, and the arc-shaped surface on the front side forms an emission surface. A plurality of light guide cuts 10a are continuously formed along the longitudinal direction (the direction perpendicular to the plane of FIG. 4) on the back surface opposite to the emission surface. One end in the longitudinal direction of this rod-shaped portion 10A (the left end in FIG. 2 (the vehicle outer side)) forms a flat incident surface, and an LED (not shown) as a light source is disposed so as to face this incident surface. Yes.

  Further, the planar portion 10B of the second light guide 10 is erected obliquely upward in a front view in a direction (upward) orthogonal to the light emission direction (rear of the vehicle), and light is transmitted from the front thereof. As shown in FIG. 4, a plurality of light guide cuts 10 b and a number of unshown wrinkles extend over the entire flat back surface opposite to the light exit surface. Is formed.

  Thus, in the second light guide 10, when a current is supplied to the LED as the light source and the LED emits light, the light enters the rod-shaped portion 10A from the incident surface at one end in the longitudinal direction of the rod-shaped portion 10A. Incident. The light that has entered the rod-shaped portion 10A travels toward the other end in the longitudinal direction (the right end (vehicle inside) in FIG. 2) while repeating total reflection inside the rod-shaped portion 10A. The light is reflected by the light guide cut 10a formed on the back surface and emitted from the front reflective surface of the rod-like portion 10A toward the rear of the vehicle. As a result, the rod-shaped portion 10A emits light.

  In addition, a part of the light traveling in the longitudinal direction through the rod-like portion 10A enters the flat portion 10B, and in the process of traveling obliquely upward in front view while totally reflecting the flat portion 10B, the back surface of the flat portion 10B In addition to being reflected by the light guide cut 10b formed in the above, it is diffused by the embossing and emitted from the front emission surface to the rear of the vehicle. As a result, the entire flat portion 10B emits light. Therefore, although the whole 2nd light guide 10 light-emits, 10 A of rod-shaped parts in which the light from LED injects directly shines brighter than the plane part 10B. And in the plane part 10B which light-emits by the light leaked from 10 A of rod-shaped parts, the gradation from which light becomes weak as it distances from 10 A of rod-shaped parts is formed.

  As described above, in the tail lamp 5 provided in the rear combination lamp 1, since the first light guide body 9 and the second light guide body 10 emit light at the same time, the tail lamp 5 performs the original function. In the embodiment, the following effects can be obtained.

  That is, in the second light guide 10 provided in the tail lamp 5, the light incident on the rod-shaped portion 10A from the LED travels in the longitudinal direction while totally reflecting the inside of the rod-shaped portion 10A. The rod-shaped portion 10A emits light from the light, and a part of the light enters the flat portion 10B from the rod-shaped portion 10A to cause the flat portion 10B to emit light. As described above, since the flat portion 10B emits surface light together with the rod-shaped portion 10A of the second light guide 10, the effect that surface emission can be performed in a wide range without increasing the outer diameter of the rod-shaped portion 10A is obtained. .

  Although the present invention has been described with respect to a form in which the present invention is applied to a rear combination lamp, it is needless to say that the present invention can be similarly applied to any other vehicular lamp provided with a light guide. It is.

1 Rear combination lamp (vehicle lamp)
DESCRIPTION OF SYMBOLS 2 Housing 3 Turn signal lamp 4 Stop lamp 5 Tail lamp 6 Bulb 7 Reflector 8 Inner lens 9 1st light guide 10 Second light guide 10A 2nd light guide rod-like part 10B Plane part 10a of 2nd light guide 10b Light guide cut

Claims (2)

In the process of guiding the light incident from the light source in the longitudinal direction, in the vehicular lamp including the light guide that emits light by reflecting the light by the light guide cut formed on the back surface and emitting it from the front exit surface,
The light guide is composed of a cylindrical bar-shaped part and a flat part integrally extending from the bar-shaped part, and a light guide cut and a texture are formed on the back surface of the flat part. Light fixture. The light source is disposed in the vicinity of one end in the longitudinal direction of the rod-shaped portion of the light guide, and the planar portion of the light guide is extended to the other end in the longitudinal direction of the rod-shaped portion in a direction perpendicular to the light emitting direction. The vehicular lamp according to claim 1.

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