JP2821891B2 - Vehicle signal light with light guide plate - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[Industrial applications]

The present invention relates to a signal light for a vehicle, such as a tail light, a brake light, and the like. Specifically, the signal light is shaped to be turned up to the side surface of the vehicle body, and it is desired that the signal light be illuminated even at the turned-in portion. It is related.

[Prior art]

FIG. 6 shows an example of this type of conventional signal lamp 51. The signal lamp 51 has a turn-in portion 51a as described above. Direct light did not reach, and therefore, it was impossible for the conventionally used inner lens 53 to shine the turn-in portion 51a. Therefore, the light guide 54 is provided to solve this point.
As shown in the figure, the turning-in portion 51 of the inner lens 53
A light collecting portion 54a is provided with a thick portion corresponding to a, and the direct light from the light source 52 incident on the light collecting portion 54a is guided by the light guiding portion 54b, and provided on the front surface or the back surface of the light guiding portion 54b. The light is emitted toward the turn-in portion 51a by a prism cut or frosting process to shine.

[Problems to be solved by the invention]

However, the light guide 54 provided integrally with the inner lens 53 described above
53, which is connected to a part of the structure.Abrupt changes in wall thickness are unavoidable at this connection due to the structure.Therefore, there is a high possibility that distortion such as sink marks will occur during molding. This causes problems such as a decrease in yield and a decrease in performance.
Inevitably causes a problem that it is difficult to shine the turn-in portion 51a as much as expected because the amount of condensed light is small, and solving these problems is an issue. Had become something.

[Means for Solving the Problems]

As a specific means for solving the above-mentioned conventional problems, the present invention provides a vehicle signal lamp in which an outer lens is turned around until the outer lens is substantially parallel to a side surface of a vehicle body and an inner lens is provided on a light source side. Is provided on the front side of the outer lens, and a light guide plate formed separately from the inner lens does not interfere with an optical path incident on the inner lens from the light source on the light source side of the revolving portion of the outer lens. A light guide plate,
A light-collecting portion extending to a position close to the light source, and a radiation light portion provided on a back surface of a turning-in portion of the outer lens.
The light guide plate connecting the two, the light condensing part of the light guide plate is thicker than the light guide part and the radiated light part, and a prism cut is formed on the back side of the radiated light part; The light guide plate at a position close to the inner lens is formed with light scattering processing for overlappingly irradiating a portion at the position of the outer lens irradiated by a portion of the inner lens close to the light guide plate. By providing a vehicular signal lamp equipped with the above, shaping is easy and the amount of condensed light is increased, thereby solving the above-mentioned conventional problems.

【Example】

Next, the present invention will be described in detail based on an embodiment shown in the drawings. In FIG. 1, reference numeral 1 denotes a signal lamp for a vehicle (hereinafter abbreviated as "lamp") which is a main part. 2a is provided in the same manner as the conventional example, but according to the present invention, the light guide plate 3
Is provided. Hereinafter, the light guide plate 3 will be described in more detail. The light guide plate 3 is formed separately and separately from the conventional inner lens 4, unlike the conventional one. The condensing unit 3a is located at a position not interfering with the optical path from the light source 5 to the inner lens 4 and near the light source 5.
Is provided at a position where the light condensed by the light condensing portion 3a can be emitted toward the turning-in portion 2a of the outer lens 2.
3b is provided, and a light guide section 3c is provided so as to connect both of them, that is, the condensing section 3a and the emitted light section 3b. At this time, naturally, the light guide plate 3 is formed using a transparent member such as a resin having a refractive index larger than that of air, so that light from the light source 5 incident on the condensing portion 3a repeats internal reflection. While emitting light 3b via light guide 3c
As shown in the enlarged view of FIG.
The direction can be changed to be equal to or less than the total reflection angle by a prism cut 3d or the like provided on the back side of the lens, and the light can be emitted, and is emitted toward the turn-in portion 2a of the outer lens 2. Here, particularly remarkable functions and effects according to the present invention are described. Since the distance B between the light collector 3a and the light source 5 can be freely set, the distance B can be appropriately adjusted. It is possible to freely adjust the amount of condensed light, and it is possible to freely adjust, for example, equalize the brightness of the front portion 2b of the outer lens 2 that the inner lens 4 covers and the brightness of the turn-in portion 2a that the light guide plate 3 covers. Become. FIG. 3 shows a second embodiment of the present invention, which is not different from the previous embodiment, that is, the first embodiment, but the outer lens which the inner lens 4 covers more. The purpose of the present invention is to prevent the occurrence of a step in brightness between the front portion 2b of the second light-emitting device 2 and the turning-in portion 2a of the light guide plate 3; On the side close to the inner lens 4 at the reflection angle of the inner lens 4, the position irradiated by the inner lens 4 is formed so as to be overlapped. Means to apply and scatter the light so as to reach the position where the inner lens 4 is irradiated, or extend the position where the prism cut 31d is applied to the condensing portion 3a side. The innerle It is intended to eliminate so as to irradiate the back of the FIG. Since the other parts are completely the same as those of the previous embodiment, detailed description thereof will be omitted. FIG. 4 shows a third embodiment of the present invention, in which the amount of light condensed by the light condensing part 31a is related to the distance from the light source 5 as described above. Since the thickness is substantially proportional to the area of the light-collecting portion 31a, the thickness of the light-collecting portion 31a is made larger than that of the other portions, that is, the radiation light portion 3b and the light guide portion 3c, so as to increase the light collection amount. Sometimes, when the wall thickness is simply increased, undesired deformation such as sink marks occurs during molding.Therefore, a slit 3e is provided in the light collector 31a, and the light collector 31a is provided at two or more parallel positions to increase the thickness. The uniformity is maintained, and at this time, a change such as giving each light condensing part 31a its own light condensing characteristic may be added. FIG. 5 shows a fourth embodiment for improving the amount of light condensing as in the previous embodiment.
The light-collecting end face 32a is provided with an end face cut 3f, for example, in the form of a Fresnel lens, so that light from the light source 5 is incident on the light guide plate 3 as substantially parallel light rays. All become equal to or more than the critical angle of the total reflection, and the transmission efficiency is improved by eliminating the light leakage from the light guide unit 3,
This is intended to substantially increase the amount of light. The embodiment described above is based on the first embodiment,
The second and subsequent embodiments have been described with examples of two combinations each independently combined with the first embodiment, but three or more, specifically, the first embodiment and the second embodiment However, as in the fifth embodiment, it is also possible to freely carry out a combination of a plurality of them. At this time, it is natural that each of them acts synergistically to further enhance the effect. Nor. Therefore, it is only necessary to appropriately select and combine them according to the degree of the desired effect. In addition, what is indicated by reference numeral 7 in the drawing is a housing.

As described above, according to the present invention, by forming the light guide plate and the inner lens separately, it is possible to firstly prevent an extremely large difference in wall thickness from occurring. It is possible to improve moldability and prevent the occurrence of distortion such as sink marks,
It is possible to improve the accuracy and yield, and to achieve an excellent effect on performance improvement and cost reduction.Secondly, by providing the above-mentioned separate body, the position where the light condensing portion of the light guide plate is provided can be freely set. This makes it possible to freely adjust the amount of incident light, eliminates the difference in brightness between the irradiation surface of the outer lens by the inner lens and the irradiation surface by the light guide plate, improves visibility and improves quality, and provides this type of vehicle signal. This provides an excellent effect of further improving the practicality of the lamp.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a vehicular signal lamp provided with a light guide plate according to the present invention, FIG. 2 is an enlarged sectional view showing an essential part of the same embodiment, and FIG. FIG. 4 is a cross-sectional view showing the second embodiment of the present invention as a main part, FIG. 4 is a perspective view showing the third embodiment as a main part, FIG. 5 is a perspective view showing the fourth embodiment as a main part, FIG. 6 is a sectional view showing a conventional example. DESCRIPTION OF SYMBOLS 1 ... Signal light fixture for vehicles provided with light guide plate 2 ... Outer lens 2a ... Revolution 2b ... Front part 3 ... Light guide plate 3a, 31a, 32a ... Condenser 3b ... Radiation light 3c …… Light guide 3d, 31d …… Prism cut 3e …… Slit 3f …… End face cut 4 …… Fresnel lens 5 …… Light source 7 …… Housing

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A 1-92004 (JP, U) JP-A 53-137782 (JP, U) JP-A 54-180552 (JP, U) JP-A 62- 201407 (JP, U) Actually open 1979-513781 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F21Q 1/00

Claims (4)

(57) [Claims] 1. A vehicle signal lamp in which an outer lens is turned around to be substantially parallel to a side surface of a vehicle body and an inner lens is provided on a light source side, wherein the inner lens is provided on a front side of the outer lens, and the outer lens is provided. A light guide plate formed separately from the inner lens is disposed at a position not interfering with an optical path incident on the inner lens from the light source, and the light guide plate is provided with the light source. A light condensing part extended to a position close to the radiator, a radiation light part provided on the back surface of the diverting part of the outer lens, and a light guide part connecting both of them, and the light condensing part of the light guide plate is It is thicker than the light guide portion and the radiation light portion, a prism cut is formed on the back side of the radiation light portion, and the light guide plate at a position close to the inner lens is close to the light guide plate of the inner lens. The vehicle signal lamp provided with a light guide plate, wherein a diffuser process of irradiating overlapping parts of the position of the outer lens is formed which portion is irradiated. 2. The light guide plate according to claim 1, wherein a portion of the light guide plate extending toward the radiating light portion or the light condensing portion has a prism cut so as to be incident on a rear surface of the inner lens in a position close to the light guide plate. A vehicle signal lamp provided with the light guide plate according to claim 1. 3. The vehicle signal light provided with a light guide plate according to claim 1, wherein the light condensing portions of the light guide plate are provided at two or more parallel positions. 4. The light-collecting end face of the light-collecting portion is cut at least in part to prevent light from being produced in the light-guiding portion. A vehicle signal lamp provided with the light guide plate according to any one of claims 3 to 7.