JPH056508U - Lens for vehicle lighting - Google Patents

Abstract

(57) [Abstract] [Purpose] In the case of a lens for a vehicle lamp in which a conventional lens surface and a frame portion are formed into a substantially box shape, and the frame portion is knurled for light shielding, In order to solve the problem that effective knurling becomes impossible due to manufacturing restrictions such as mold release conditions at the time, and the purpose cannot be fully achieved. [Structure] The knurling process 31 applied to the frame part 3 is performed approximately on the front and back knurls 31a and the back knurls 31b, which are applied to both front and back faces of the frame part 3 and are respectively shifted by ¼ pitch. The same effect as the reduction of the pitch of the knurling 31 is performed, thereby enhancing the diffusion effect and attaining the purpose.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a lens of a vehicular lamp such as a headlight, and more particularly to prevention of light leakage in a direction other than a harmful irradiation direction in the lens.

[0002]

[Prior Art]

 FIGS. 3 and 4 show an example of a conventional lens 90 for a vehicle lamp of this type. The lens 90 is entirely formed of a transparent member of glass or resin, and a parallel light beam from a reflecting mirror 80 or the like. A lens surface 91 provided with a lens cut 91a for giving an appropriate light distribution characteristic to the housing, and a frame portion 92 for mounting the lens surface 91 on the housing 81 at a predetermined position in a substantially box shape. Therefore, the frame portion 92 is subjected to a low-rotation process 92a to diffuse direct light or the like from the light source 82 passing through the frame portion 92 to lose the directionality and reach the driver of the oncoming vehicle. It is designed to prevent dazzling and prevent dazzling.

[0003]

[Problems to be solved by the device]

 However, in the above-mentioned conventional knurling 92a, there are restrictions due to manufacturing conditions such as the direction in which the lens 90 is molded when the lens 90 is molded or the ease with which the lens is released from the mold. In practice, the shape is a crease shape along the mold withdrawal direction, and the pitch P is also about 1 mm, which is insufficient to obtain the expected performance and causes dazzling. However, there is a problem in that the process is complicated, for example, coating is applied to the frame portion 92 in order to prevent it, and the solution to this point has been a problem.

[0004]

[Means for Solving the Problems]

 The present invention is, as a specific means for solving the above-mentioned conventional problems, for a vehicle in which a lens surface and a frame portion are formed into a substantially box shape, and the frame portion is knurled for light shielding. In the lens of the lamp, the knurling process applied to the frame part is performed on both front and back surfaces of at least a part of the frame part, and each is knurled with a shift of about 1/4 pitch. The problem is solved by providing a lens for a vehicle lamp.

[0005]

【Example】

 Next, the present invention will be described in detail based on an embodiment shown in the drawings. In order to facilitate understanding, the same parts as those of the conventional example will be described with the same reference numerals, and the description of the overlapping parts will be partially omitted. Reference numeral 1 in FIG. 1 denotes a lens of a vehicular lamp according to the present invention. The lens 1 is formed in a substantially box shape by a lens surface 2 and a frame portion 3, and the lens surface 2 has a lens cover. The conventional example is that the frame 2 is subjected to a knurling process 31 having a streak shape along the removal direction from the mold for the purpose of shielding light from the light. Similar to that of.

However, according to the present invention, the knurling process 31 is performed as the front knurl 31a and the back knurl 31b having the same pitch P on the front and back surfaces of the frame portion 3, respectively. The positions of the front knurl 31a and the back knurl 31b are offset from each other by 1/4 pitch.

Next, the operation and effect of the lens 1 of the present invention having the above-described structure will be described. It is because the front knurl 31a and the back knurl 31b have a parallel linear shape and the same pitch P. By shifting them by 1/4 pitch, it is possible to obtain the same effect as when one of the surfaces of the frame 3 is knurled with 1/2 pitch P. For example, a light source It is possible to more efficiently diffuse the direct light from 82 and the like, thereby preventing the emission of harmful light such as dazzling light generated from the frame portion 3.

[0008]

[Effect of the device]

 As described above, according to the present invention, the knurling process applied to the frame part is performed on both the front and back surfaces of the frame part, and the knurling process is performed by shifting each by 1/4 pitch. As a result, the knurling process, which could not be performed at a fine pitch enough to obtain a practically sufficient effect due to restrictions on manufacturing conditions such as mold release, was shifted by 1/4 pitch and the front and back surfaces were changed. As a result, it is possible to obtain an effect that is substantially equivalent to the effect of knurling of 1/2 pitch, so that it is possible to obtain an excellent effect of improving the performance of this kind of vehicle lighting such as prevention of light leakage. It plays.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of a lens of a vehicular lamp according to the present invention.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a cross-sectional view showing a conventional example.

FIG. 4 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

 1 ... Lens 2 ... Lens surface 2a ... Lens cut 3 ... Frame part 31 ... Knurl processing 31a ... Front knurl, 31b ... Back knurl

Claims (1)

Claims for utility model registration: 1. A lens for a vehicle lighting device, comprising a lens surface and a frame portion formed into a substantially box shape, and the frame portion is knurled for light shielding. The lens of the vehicle lamp is characterized in that the knurling applied to the portion is applied to both front and back surfaces of at least a part of the frame portion, and each of them is knurled with a shift of approximately 1/4 pitch.