JP2573918Y2 - Instrument lighting structure - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a lighting structure of an instrument,
In particular, the present invention relates to an illumination structure of an instrument for transmitting and illuminating a dial from the back side through a light guide plate.

[0002]

2. Description of the Related Art FIG. 2 shows a dial portion of a conventional automobile meter, for example, a dial plate 2 having a display design 1 such as a character 1 'and a scale 1 "of a speedometer printed on its surface. A light guide plate 3 made of a transparent material is provided on the back surface of the light guide plate 3, and an illumination light bulb (not shown) mounted on a meter case is provided on the back surface side of the light guide plate 3. A light incident surface (not shown) is formed in a portion of the light guide plate 3 corresponding to the illumination light bulb, and the light from the illumination light bulb is diffused through the light incident surface into the light guide plate 3. It is being led.

In the above-mentioned conventional lighting structure, the light guide plate 3
Irradiation light of the lighting bulb guided into the inside is diffused throughout the light guide plate 3 and is emitted to the dial 2 side, whereby the display design 1 on the surface of the dial 2 is displayed on the dial. Light is transmitted through the back side of the plate.

However, since various parts such as a meter internal machine are incorporated in the meter case, such parts become shadows and the irradiation light of the lighting bulb does not sufficiently flow into the light guide plate 3. In some cases, this causes a problem that the display design 1 of the dial 2 is partially darkened.

Therefore, as shown in FIG. 3, conventionally, the light guide plate 3 corresponds to the dark portion 4 of the display design 1 of the dial 2.
A so-called satin portion 3a in which a fine unevenness treatment is performed is partially formed on the back surface of the light guide plate 3.
The light is diffusely reflected at the portion a and actively emitted toward the dial 2 side,
There is one that prevents dark spots in the illumination described above from occurring.

[0006]

However, in the conventional lighting structure of an instrument, the matte portion 3a makes the portion of the display design 4 with dark illumination bright, but the matte portion 3a emits the light toward the dial 2 side. As a result of an extreme difference between the amount of light and the amount of light emitted to the dial 2 side in the smooth portion 3b around the satin portion 3a and not subjected to the satin process, the boundary 5 between the satin portion 3a and the smooth portion 3b is generated. However, as shown in FIG. 3, when the display design 1 (scale 1 ") is located in the middle, the display design 1a on the satin portion 3a side becomes brighter, while the display design 1 on the smooth portion 3b side. 1b does not become so bright that clear illumination unevenness may occur in the display design 1 or the boundary portion 5 may be visually recognized as a shadow in the display design 1, so that it is not possible to obtain a dial illumination with a high-class design. Has the disadvantage of

For this reason, in order to prevent the above-mentioned uneven lighting, it is necessary to adjust the boundary 5 of the satin portion 3a so as not to be located in the middle of the display design 1, as shown in FIG.
As a result, there is an inconvenience that it is not possible to brighten a portion that should be made brighter (in the case of FIG. 3,
The tip of scale 1 "does not light up).

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to provide a lighting structure of an instrument which can prevent uneven lighting of a display design and obtain a high-grade feeling of the design. .

[0009]

In order to achieve the above object, an illumination structure of an instrument according to the present invention is provided with a light guide plate made of a transparent material on a back surface of a dial plate having a display design such as characters on the surface. Then, the irradiation light from the light source disposed on the back side of the light guide plate is guided into the light guide plate, and the display design of the dial is transmitted and illuminated, and the irradiation light does not easily enter the light guide plate, In the lighting structure of the instrument, in which the display design of the dial corresponds to a dark portion, and a fine unevenness processing portion is partially formed on the back surface of the light guide plate, at the boundary portion of the unevenness processing portion on the back surface of the light guide plate. The feature that the unevenness of illumination of the display design occurs, a smoothness increasing portion is formed such that the smoothness of the back surface of the light guide plate is increased from the unevenness processing portion toward the surrounding smooth portion. Is what you do.

[0010]

According to the present invention, the display design of the dial is transmitted and illuminated from the back surface of the dial through the light guide plate, and the unevenness of the back surface of the light guide plate formed corresponding to the dark portion of the display design. The processing unit diffusely reflects the irradiation light and emits the irradiation light to the dial side, thereby preventing a dark portion from being generated in the display design. Further, in the boundary portion of the unevenness processing portion on the back surface of the light guide plate, in the portion where the illumination unevenness of the display design occurs, the smoothness of the light guide plate back surface is increased from the unevenness processing portion to the surrounding smooth portion. Since the smoothness increasing portion is formed, the amount of light emitted toward the dial from the satin portion to the smooth portion can be gradually reduced.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. FIG. 1 shows an embodiment of a lighting structure of a meter according to the present invention, in which a display design 1 such as a character 1 'or a scale 1 "is printed and formed on a back surface of a dial 2 on which a transparent material is provided. An illumination light bulb (not shown) mounted on a meter case is disposed on the back side of the light guide plate 3. The illumination light bulb of the light guide plate 3 is also provided. A light incident surface (not shown) is formed in a portion corresponding to the light emitting device, and the irradiation light of the lighting bulb is diffused through the light incident surface and guided into the light guide plate 3. .

Further, a dark part 4 of the display design 1 is generated because the irradiation light does not sufficiently enter the light guide plate 3 due to a shadow of an internal meter or the like incorporated in the meter case.
Corresponding to the above, a so-called satin portion 3a subjected to fine unevenness processing is partially formed on the back surface of the light guide plate 3, and the irradiation light guided into the light guide plate 3 is irregularly reflected at the satin portion 3a. As a result, the light is actively emitted toward the dial 2 side.

Further, a boundary portion between the satin-finished portion 3a and the smooth portion 3b around the satin-finished portion 3a, which has not been subjected to the satin-finished process, and the boundary between the satin-finished portion 3a and the smoothed portion 3b corresponds to the display design 1. In a part located in the middle part, a smoothness increasing portion 6 in which the smoothness of the back surface of the light guide plate 3 increases from the satin portion 3a toward the smooth portion 3b (the roughness of the irregularities of the satin portion 3a gradually decreases). Are formed.

Here, to form the satin portion 3a,
What is necessary is just to form a point-like uneven pattern by honing or the like on the mold side for forming the light guide plate 3, and to form the smoothness increasing portion 6, the satin portion extends to a range including the smoothness increasing portion 6. 3a may be formed, and the roughness of the satin finish of the smoothness increasing portion 6 may be removed with a file or the like to gradually reduce the roughness of the roughness.

Next, the operation of this embodiment will be described.
In the present embodiment, the irradiation light of the lighting bulb guided into the light guide plate 3 is diffused throughout the light guide plate 3 and emitted to the dial 2 side. The display design 1 on the front side is transmitted and illuminated from the back side of the dial.

Further, a satin portion 3a is partially formed on the back surface of the light guide plate 3 in correspondence with the portion 4 where the illuminating light is hardly wrapped and the display design 1 is partially darkened. Irradiation light is diffusely reflected at the portion 3a and is actively emitted toward the dial 2 side, so that a dark portion of illumination is prevented from occurring.

Further, a satin portion 3a on the back surface of the light guide plate 3 is provided.
Even if the boundary between the flat part 3a and the surrounding smooth part 3b is located in the middle of the display design 1,
Since the smoothness increasing portion 6 is formed at the boundary with the b, the amount of light emitted to the dial 2 side gradually decreases from the satin portion 3a to the smooth portion 3b. In the display design 1, clear illumination unevenness of the display design 1 or a shadow or the like due to the boundary portion caused by an extremely different amount of light emitted to the dial 2 side between the portion 3a and the smooth portion 3b is visually recognized. It can prevent that.

Therefore, in the present embodiment, even when the boundary between the matte portion 3a on the back surface of the light guide plate 3 and the surrounding smooth portion 3b is located in the middle of the display design 1, the matte portion 3a is Since the smoothness increasing portion 6 is formed at the boundary with the smooth portion 3b, the amount of light emitted toward the dial 2 from the satin portion 3a to the smooth portion 3b can be gradually reduced. It is to be noted that, due to the extreme difference in the amount of light emitted to the dial 2 side between the smoothed portion 3b and the smoothed portion 3b, a clear illumination unevenness of the display design 1 or a shadow due to the boundary portion is visually recognized in the display design 1. It can be prevented, and it is possible to provide a dial lighting with a high-class design.

In the above-described embodiment, the fine irregularities formed on the back surface of the light guide plate 3 are described as the satin-finished portions 3a. As long as it is possible to do so, a grain, a machined pattern or the like may be used.

[0020]

As described above, the illumination structure of the meter according to the present invention is provided at the boundary portion of the unevenness processing portion on the back surface of the light guide plate, where the unevenness of the display design is caused by the unevenness processing portion. Since the smoothness increasing portion is formed so that the smoothness of the back surface of the light guide plate increases toward the surrounding smooth portion, the amount of light emitted toward the dial from the satin portion to the smooth portion can be gradually reduced. As in the prior art, it is possible to prevent a clear illumination unevenness of a display design and to prevent a shadow or the like from being visually recognized in the display design, and to provide a dial illumination with a high-class design. Play.

[Brief description of the drawings]

FIG. 1 is a perspective view of an essential part showing an embodiment of a lighting structure of a meter according to the present invention.

FIG. 2 is a perspective view showing a conventional lighting structure.

FIG. 3 is a perspective view showing another conventional illumination structure.

FIG. 4 is a perspective view showing still another conventional illumination structure.

[Explanation of symbols]

 Reference Signs List 1 display design 2 dial plate 3 light guide plate 3a satin portion 3b smooth portion 4 dark portion of display design 5 boundary portion between satin portion and smooth portion 6 smoothness increasing portion

Claims (1)

(57) [Scope of request for utility model registration] 1. A light guide plate made of a transparent material is provided on the back surface of a dial plate on which a display design such as a character is formed, and light emitted from a light source provided on the back surface side of the light guide plate is applied to the light guide plate. Inside, and illuminate the display design of the dial with transmitted light,
The illuminating light is poorly wrapped into the light guide plate, and the display design of the dial corresponds to a dark portion, and in a lighting structure of an instrument in which a fine unevenness processing portion is partially formed on the back surface of the light guide plate, In the boundary portion of the unevenness processing portion on the back surface of the light guide plate, in the portion where the illumination unevenness of the display design occurs, the smoothness of the back surface of the light guide plate is increased from the unevenness processing portion toward the surrounding smooth portion. An illumination structure for an instrument, wherein a smoothness increasing portion is formed.