JPH0355985Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to a lighting device for a display part used to display characters, numbers, whether or not to light up, etc. in electrical equipment, and in particular a lighting device that can be formed into a thin and compact size. This is what we propose.

(Prior Art) As shown in the longitudinal side view of FIG. 3, this type of illumination device has a light guide body 2 of uniform thickness attached to the front side of a wiring board 1, and a display area such as a liquid crystal display. 3 is attached to the surface side of the light guide body 2, a light emitter 4 such as a lamp is embedded in the left and right sides of the light guide body 2, and a device 5 for driving the light emitter 4 and the display section 3 is attached. is mounted on the back side of the wiring board 1.

(Problem to be solved by the invention) In the conventional lighting device described above, the light from the left and right light emitters 4 does not reach the center of the light guide 2 sufficiently, so the center of the display section 3 becomes dark. Therefore, the display function is insufficient and the result is a victory.

Moreover, since the device 5 is provided on the back side of the wiring board 1, the problem is that the thickness of the lighting device becomes thicker by the height of the device 5 protruding from the wiring board 1, and the overall size becomes larger. be.

(Means for solving the problem) This idea is designed to allow sufficient light to reach the center of the light guide so that the display area can be displayed with approximately uniform brightness, and to be compact and thin. The present invention proposes a lighting device having a light guide body 9 provided in front of a wiring board 6 on which a device 8 is mounted. Therefore, the arc-shaped concave portion 10, which is a lighting device that illuminates the display section 17 in front of the light guide body 9 and into which the device 8 provided on the front side of the wiring board 6 can enter, is located at the center of the light guide body 9. This is an illumination device for a display section, in which a light reflecting layer 13 is formed on a concave surface section 10, and a light scattering slit 16 is provided at a central portion of a light guide body 9.

(Function) The light from the light emitting bodies 7, 7 on the left and right parts 11, 11 is collected by the concave part 10 and the light reflecting layer 13 of the light guide body 9 on the thin wall part 14 in the central part. The light enters a certain light scattering slit 16, is appropriately scattered by the light scattering slit 16, and is diffused over substantially the entire surface of the light guide body 9.
Thereby, the entire surface of the display section 17 is displayed with substantially uniform brightness.

The device 8 mounted on the front side of the wiring board 6 enters into the concave portion 10 of the light guide body 9, thereby making the lighting device thinner and more compact.

(Example) Next, an example of this invention will be demonstrated based on the drawings.

FIG. 1 shows a compliant side surface in an assembled state, and FIG. 2 shows an exploded perspective view thereof. Light emitters 7, 7, such as lamps, are attached to the left and right parts of the front surface side of the wiring board 6, and A device 8 for driving 7 is mounted on the front surface side of wiring board 6. When a light guide body 9 made of transparent or semi-transparent synthetic resin is provided with an arc-shaped concave surface 10 in the center and left and right parts 11, 11 of the light guide body 9 are attached to the surface side of the wiring board 6, the device The size of the concave part 10 is determined so that the light emitting element 8 can fit into this concave part 10, and the left and right parts 11, 11 are provided with concave parts 12, 12 into which the light emitting body 7 can enter.

A light reflecting layer 13 is provided in the concave portion 10 to prevent the light from the light emitter 7 that has entered the concave portion 12 from leaking out from the concave portion 10 (by pasting a metal plate or coating it with silver, etc.). ), the thin wall portion 14 at the center of the light guide body 9 has left and right portions 11, 11.
A plurality of light scattering slits 16 are carved for scattering light flowing into the thin portion 14 from the thin wall portion 14 onto the front surface side 15.

The display portion 17 is formed in a thin plate shape with a size that can cover the front side 15, and the display portion 17 is formed on the front side 15.
join. The light guide body 9 is attached to the wiring board 6, the display part 17 is joined to the display side 15 of the light guide body 9, and the wiring board 6, the light guide body 9, and the display part 17 are joined to the frame-shaped holder 18. Use the attached one.

Therefore, the light from the light emitters 7, 7 is transmitted through the light guide body 9.
The light traveling inside toward the center and toward the back side is reflected by the light reflection layer 13 toward the front side 15, and this light is diffused by the light scattering slit 16 provided in the center. Since the light is dispersed over substantially the entire surface of the display section 17, the display section 17 has uniform brightness over substantially the entire surface.

The display section 17 may be formed of a liquid crystal that can itself emit light, and in the case where the display section is formed of a liquid crystal in this way, although not shown, it can be displayed using appropriate wiring from the device 8. voltage will be applied to the section.

(Effect of the invention) Since the illumination device of the display unit according to this invention is configured as described above, the light from the light emitters 7 provided on the left and right parts 11, 11 is transmitted to the concave surface of the light guide body 9. 10 and the light reflecting layer 13, the light is concentrated in the thin part 14 in the central part, and is diffused by the light scattering slit 16, so that almost the entire surface of the display part 17 is displayed with uniform brightness, so that the display part as in the conventional case is not This invention solved the problem of light not reaching the center of the screen. A wiring board 6 is mounted on the concave portion 10 of the light guide body 9.
Since the device 8 mounted on the front side of the device fits in, the thickness of the lighting device becomes thinner.
It has become compact.

[Brief explanation of the drawing]

FIG. 1 is a vertical side view of an embodiment of this invention, FIG. 2 is an exploded perspective view of FIG. 1, and FIG. 3 is a vertical side view of a conventional lighting device. 6... Wiring board, 7... Light emitting body, 8... Device, 9... Light guide body, 10... Concave portion, 11...
... left and right parts, 13 ... light reflection layer, 16 ... light scattering slit, 17 ... display section.

Claims (1)

[Scope of utility model registration request] A lighting device that illuminates a display section in front of the light guide by a light guide provided in front of a wiring board on which a device is mounted, with light emitters on the left and right sides, the front side of the wiring board An arc-shaped concave portion into which the device provided on the light guide can enter is provided in the central portion of the light guide, a light reflecting layer is formed in the concave portion, and a light scattering slit is provided in the central portion of the light guide. Display lighting device.