JPH0562401B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lamp in which a lens made of a plurality of prism elements is provided in a frame of a lamp chamber.

[Prior art]

Examples of conventional lamps of this type include those shown in Figures 4 to 8 (see Service Bulletin No. 440, page 258, published by Nissan Motor Co., Ltd., June 1980). The ones shown in FIGS. 5 to 5 are lamps used for rear combination lamps such as turn signal lamps and stop lamps of vehicles.
The housing 101 has a rectangular shape as a whole, and a groove-shaped outer frame portion 103 having parallel outer frame pieces 103a and inner frame pieces 103b is formed around the housing 101. An intermediate frame piece 105 is formed in parallel inside the outer frame part 103, and the housing 101 is connected to a plurality of light chambers 1 by this intermediate frame piece 105.
It is divided into 07 sections. That is, the intermediate frame piece 105 and the outer frame portion 103 constitute a frame 109 of each lamp chamber 107. Each lamp chamber 107 is provided with a bulb 111 as a light source and a reflector 113 that reflects the light rays from the bulb 111. Furthermore, a lattice-shaped lens 115 made up of a plurality of prism elements 117 is provided on the front surface of the housing 101 . Each prism element 117 is formed into a square shape with good light distribution performance and little light distribution loss.
Each prism element 117 is provided parallel to each side of the frame 109, with a plane facing outside and a convex surface 117a facing inside, which is the reflector 113 side. Around the lens 115 is the reflector 11
A supported portion 119 is formed by bending toward the third side, and this supported portion 119 is bent toward the outer frame portion 10.
3 and fixed with adhesive 121. Then, the inner frame piece 103b and the intermediate frame piece 105
A frame 109 consisting of the following is disposed at the position of the convex surface 117a (see FIG. 5).

The light emitted from the bulb 111 and reflected by the reflector 113 becomes parallel light rays as shown by the arrows in FIG. 5, enters the lens 115, and is diffused by each prism element 117 of the lens 115. At this time, since each prism element 117 is formed in a square shape, it is possible to perform diffusion with good light distribution performance and little light distribution loss.

[Problem that the invention seeks to solve]

However, the frame 1 consisting of the inner frame piece 103b and the intermediate frame piece 105 of the conventional lamp configured as described above.
09 is disposed at the position of the convex surface 117a of the prism element 117, and is emitted from the bulb 111,
Parallel rays reflected by the reflector 113 and incident on the lens 115 are blocked by the frame 109 and are not incident on the entire prism element 117. Therefore, each prism element 117 where the frame 109 is located becomes dark as a whole, as shown in the shaded area in FIG.
09 There was a problem that the inner peripheral edge became dark.

Therefore, as shown in FIG.
Each prism element 217 is square like the above one, and when the lamp chamber 207 is formed into a parallelogram, each prism element 217 located at the periphery of the frame 209 is Frame piece 20
3b, 205 as a boundary, the incidence of light rays is blocked and becomes dark, so that the inner part located within the frame 209 also becomes dark in a stepwise manner, resulting in a problem that the appearance is poor.

In order to solve this problem, it is proposed that each prism element 317 of the lens 315 be made into a parallelogram to match the shape of the lamp chamber 307, as shown in FIG. Although this device can prevent stepwise darkness at the position of the frame 309, since each prism element 317 is a parallelogram, it is not possible to obtain the normally required square or rectangular light distribution. As shown in the light distribution pattern shown in Figure 8, while the light distribution in the B part is redundant compared to the square one, the light distribution in the A part is insufficient, resulting in poor light distribution performance and large light distribution loss. There was a problem.

[Purpose of the invention]

In view of the problems of the prior art, it is an object of the present invention to provide a lamp that can prevent darkness at the periphery of the frame and has good light distribution efficiency.

[Means for solving problems]

In order to achieve such an object, the present invention provides a light source and its reflecting mirror in a lamp chamber with a frame formed on the front side, and a lens consisting of a plurality of prism elements each having a rectangular shape when viewed from the front. In the lamp installed toward the inside of the lamp chamber, the frame has a portion arranged diagonally with respect to the rectangular prism element, and the prism element is viewed from the front at a location corresponding to the diagonal portion of the frame. The prism element has a parallelogram shape, the frame is located in a recess formed between the convex surfaces of each prism element, and a prism element having a triangular shape in front view is provided between the parallelogram prism element and the square prism element. It is characterized by

[Effect]

In this invention, light rays from a light source are reflected by a reflecting mirror, become parallel rays, enter each prism element of a lens, and are diffused by the prism elements. At this time, the diagonal part of the frame formed on the front side of the light chamber is
By making the prism elements at the corresponding locations parallelogram-shaped when viewed from the front, they can be positioned in the recess formed between the convex surfaces of adjacent prism elements, and the prism elements located at the periphery of the frame are blocked from incident light. Since the light is distributed throughout the entire frame, it is possible to prevent the inner periphery of the frame from becoming dark, and it is possible to obtain efficient light distribution.

〔Example〕

The structure of the present invention will be explained based on an embodiment of a lamp used for a rear combination lamp such as a turn signal lamp or a stop lamp of a vehicle shown in FIGS. 1 to 3.

Housing 1 has top side 1A, bottom side 1B, left oblique side 1
It is formed into a parallelogram consisting of C and a right oblique side (not shown), and a groove-shaped outer frame portion 3 having a parallel oblique outer frame piece 3a and an inner frame piece 3b is formed around the front side of the parallelogram. . A diagonal intermediate frame piece 5 parallel to the left oblique side 1C is formed inside the outer frame portion 3, and the housing 1 is partitioned into a plurality of lamp chambers 7 by this intermediate frame piece 5. That is, the intermediate frame piece 5 constitutes the frame 9 of each lamp chamber 7 together with the inner frame piece 3b. Inside each light chamber 7 is a bulb 1 that is a light source.
1 and a lens 15 which will be described later.
A reflector 13 is provided to reflect the light toward. Although not shown, the bulb 11 is turned on by a switch provided on the dash board.

In addition, the front surface of the housing 1 is formed to have a parallelogram-like outer circumferential shape to match the housing 1.
A lattice-shaped lens 15 made up of a plurality of prism elements 17 is provided. Each prism element 17 is provided with its plane facing outward and its convex surface 19 facing the lamp chamber 7 side. Each prism element 17 has a second shape.
The structure is as shown in Fig. 3 and Fig. 3. First, contact the outer frame piece 3a at the left oblique side 1C position, and the inner frame piece 3
prism element 17A located between b and prism elements 17B, 17 located on both sides of intermediate frame piece 5.
B has a parallelogram shape when viewed from the front and a semicircular shape when viewed from the cross section. These prism elements 17A, 17B
Prism element 17C at the inner peripheral edge position of frame 9 adjacent to
has a triangular shape when viewed from the front and a four-semicircular shape when viewed from the cross section. Furthermore, prism elements 17 adjacent to this prism element 17C are arranged in a grid pattern in the longitudinal direction.
D is formed into a square having sides parallel to the upper side 1A and the lower side 1B when viewed from the front, and semicircular when viewed in cross section.

Then, the convex surfaces 1 of the prism elements 17A and 17C
The inner frame side 3b on the left oblique side 1C side is located in the recess 21a formed between 9a and 19c (see FIG. 2), and the convex surface 19 of the prism elements 17B, 17B
The intermediate frame side 5 is positioned and disposed in the recess 21b formed between b and 19b (see FIG. 2), and further,
Convex surfaces 19d, 19 of prism elements 17D, 17D
The upper side 1A and the lower side 1 are placed in the recess 21d formed between d.
The inner frame side 3b on the B side is positioned and arranged (see FIG. 3).

The periphery of the lens 15 is bent toward the reflector 13 side to form a supported portion 23, which is fitted into the outer frame portion 3 and fixed with an adhesive 25. .

Next, the operation of one embodiment of the present invention configured as described above will be explained.

With the switch installed on the dart board,
When the bulb 11 is turned on, the light rays emitted from the bulb 11 are reflected by the reflector 13, become parallel rays as shown by the arrows in FIG. 2, enter the lens 15, and are diffused by each prism element 17 of the lens 15. be done. At this time, since each prism element 17 is formed into a square prism element 17A on the inside, it is possible to perform diffusion with good light distribution performance and little light distribution loss.

Moreover, the inner frame piece 3b located at the left oblique side 1C is located in the recess 21a formed between the convex surfaces 19a and 19c of the prism elements 17A and 17C, and the intermediate frame piece 5 is disposed on the convex surface of the prism elements 17B and 17B. 1
The inner frame side 3b at the positions of the upper side 1A and the lower side 1B is located in the recess 21b formed between the convex surfaces 19d and 19d of the prism elements 17D and 17D. The prism elements 17</b>B, 17</b>C, and 17</b>D on the inner peripheral edge of the frame 9 are arranged so that light rays are incident on the entire prism elements 17</b>B, 17</b>C, and 17</b>D. Therefore, the inner periphery of the frame 9 can be prevented from becoming dark and the appearance will not deteriorate in this area as well, and moreover, the light distribution performance can be improved and the light distribution can be diffused with less loss.

In the above embodiment, the prism element 17 has a square shape when viewed from the front, but is not limited to this, and may have a rectangular shape.In short, the frame 9 is formed between the convex surfaces 19 of the prism element 17. Any type of material may be used as long as it is placed in the position of the recess.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the prism elements in the portions corresponding to the diagonal portions of the frame of the lamp chamber are shaped like parallelograms when viewed from the front. The prism element corresponding to the diagonal frame allows the light rays from the light source to enter the entire prism element without being blocked, so the lens will not become dark in the diagonal frame area. It can be prevented, looks good, and can be diffused with good light distribution efficiency and little loss of light distribution. Therefore, even if the lamp chamber is obliquely deformed with respect to a rectangular prism element, a good light distribution can be obtained.

Furthermore, by combining triangular prism elements when viewed from the front, parallelogram prism elements can be connected to square prism elements, and the main prism element does not need to be formed to match the shape of the lamp chamber. By forming it into a rectangular shape with good light distribution efficiency, it is possible to perform diffusion with little light distribution loss over the entire area within the frame.

[Brief explanation of drawings]

1 to 3 show an embodiment of the lamp according to the present invention, in which FIG. 1 is an overall plan view, FIG. 2 is a sectional view taken along the line of FIG. 1, and FIG. - line sectional view, Fig. 4 is an overall plan view of the conventional example, Fig. 5 is a - line sectional view of Fig. 4, Fig. 6 is an overall plan view of an improvement plan of the conventional example, and Fig. 7 is an overall plan view of the conventional example. The overall plan view of another improvement plan, FIG. 8, is a light distribution pattern of the improvement plan shown in FIG. 7... Lamp chamber, 9... Frame, 11... Bulb (light source), 13... Reflector (reflector), 15... Lens, 17, 17A, B, C, D... Prism element, 19, 19a , b, c, d... convex surface, 21
a, b, d...concavity.

Claims (1)

[Scope of Claims] 1. A light source and its reflecting mirror are provided in a lamp chamber having a frame formed on the front side, and a lens consisting of a plurality of prism elements each having a rectangular shape when viewed from the front is directed with its convex side toward the inside of the lamp chamber. In the lamp provided in the above, the frame has a portion arranged diagonally with respect to the rectangular prism element, and the prism element has a parallelogram shape when viewed from the front at a portion corresponding to the diagonal portion of the frame, The lamp is characterized in that the frame is located in a recess formed between convex surfaces of each prism element, and a prism element having a triangular shape in front view is provided between the parallelogram prism element and the square prism element. .