JPH10125119A - Back-light device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a large reflector with multiple small reflector components by dividing the reflector into multiple reflector components. SOLUTION: A reflector 3 is divided into the first and second reflector components 21, 22. The first and second reflector components 21, 22 are formed with a synthetic resin into the same shape. Positioning lugs 13, 13... for positioning and fixing in a chassis 6 are provided at one-side sections of the first and second reflector components 21, 22. The reflector 3 is divided into multiple reflector components 21, 22 in this back-light device, and the large reflector 3 can be formed with multiple small reflector components 21, 22, and a large molding die required for an integrally molded reflector is not required.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device used as a backlight of a liquid crystal panel.

[0002]

2. Description of the Related Art As a backlight device used for a liquid crystal panel or the like, a backlight device shown in a sectional view of FIG. 8 is known. The backlight device 101 includes a plurality of fluorescent tubes 102... 102 as light emitters and these fluorescent tubes 102.
, A diffuser plate (light diffusion plate) 103 disposed on the front side (upper side in FIG. 8), a reflective plate 104 made of synthetic resin disposed on the rear side of the fluorescent tubes 102,. 102, 102, a chassis 105 to which a diffusion plate 103 and a reflection plate 104 are attached, and a cover 106. The fluorescent tubes 102 and 102 and the reflector 10
The light reflected by 4 is diffused by the diffusion plate 103,
It is adapted to be applied to a liquid crystal panel not shown.

The reflection plate 104 made of synthetic resin is integrally formed by injection molding synthetic resin.
In the reflecting plate 104, concave portions 111 to 111 for efficiently reflecting the light of the fluorescent tubes 102 toward the diffusion plate 103 side are formed in parallel on one side surface.

[0004]

As described above, the above-mentioned conventional backlight device 101 includes the reflecting plate 104.
Was formed integrally with a synthetic resin, there were the following problems.

(1) As the size of the reflector 104 increases, the production efficiency deteriorates (the molding time increases) and the production cost increases.

(2) As the size of the reflector 104 increases, warpage or bending occurs, and it becomes more difficult to maintain the quality of the reflector 104.

(3) If the size of the reflection plate 104 becomes large, the size of a mold for molding the same increases, and the cost of the mold also increases.

According to the present invention, the above-mentioned conventional problems can be solved by forming the reflector in a plurality of reflector structures.

[0009]

The present invention comprises a luminous body, a reflector made of synthetic resin for reflecting the light of the luminous body, and a diffuser for diffusing the light from the luminous body and the reflector. In the backlight device, a large-sized reflector can be formed from a plurality of small reflectors by configuring the reflector made of the synthetic resin with a plurality of reflectors.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a backlight device 1 according to the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of the backlight device 1. The backlight device 1 includes a plurality of fluorescent tubes 2... 2 as a plurality of luminous bodies, a reflecting plate 3 that reflects light from these fluorescent tubes 2.
, 2 and a diffusion plate 4 for diffusing light from the reflection plate 3 and hitting a liquid crystal panel (not shown), a drive circuit board 5 for the fluorescent tubes 2,. A chassis 6 for assembling the diffusion plate 4 and the like, and a cover 7 are provided.

The reflecting plate 3 is injection-molded in a rectangular box shape using a synthetic resin. A corrugated reflecting surface portion 3a is provided at a center portion, and both sides of the reflecting surface portion 3a are provided. , Housing portions 3b, 3b of drive circuit board 5
Is provided.

As shown in FIG. 2, the reflection surface portion 3a
The number of recesses 11... 11 corresponding to the number of the fluorescent tubes 2.
, And the fluorescent tubes 2 are respectively arranged in the central portions of the concave portions 11... 11 as shown by a two-dot chain line.

The bottom surface 11a of the recess 11 is formed as a flat surface parallel to the diffusion plate 4, and both side surfaces 11b and 11c of the recess 11 are formed at an angle of approximately 45 ° with respect to the diffusion plate 4. It is formed on an inclined surface. A hook-shaped clamp portion 12 is provided on the bottom surface 11 a of the concave portion 11, and the fluorescent tube 12 is held in the concave portion 11 by the clamp portion 12.

As shown in FIG. 3, the reflection plate 3 is divided into first and second two reflection plate structures 21 and 22. The first and second reflector plate members 21 and 22 are formed in the same shape by a synthetic resin. Positioning protrusions 13 for positioning and fixing in the chassis 6 are provided on one side of the first and second reflecting plate structures 21 and 22.
.. 13 are provided.

Next, an example of a method of assembling the backlight device 1 will be described. As shown in FIG.
The second reflector structures 21 and 22 are inserted into the chassis 6. At this time, the first and second reflector structures 21, 22 are formed.
13 are formed on the side wall 6a of the chassis 6 with projection engaging pieces 14.
And the first and second reflector structures 21 and 22 are positioned. Next, after attaching a U-shaped heat radiator 16 (see FIG. 1) to both ends of the fluorescent tubes 2,... , Clamped by the clamp member 12. Next, the drive circuit board housing portions 3 provided on both sides of the reflection plate 3
b. Next, the backlight device 1 is assembled by placing the diffusion plate 4 on the chassis 6, covering the cover 7, and connecting the chassis 6 and the cover 7 with screws or the like.

FIGS. 6 and 7 show a modification of the reflection plate 3. FIG.
In the first modified example shown in FIG.
It is divided into fourth four reflector structures 31-34. The first to fourth reflecting plate structures 31 to 34 are formed of a synthetic resin in the same shape, and are configured as the reflecting plate 3 by being inserted into the chassis 6.

In the second modification shown in FIG. 7, the reflector 3 is divided into first to sixth reflector structures 41 to 46. The first to sixth reflecting plate structures 41 to 4
Reference numeral 6 is made of a synthetic resin and has the same shape, and is configured as the reflector 3 by being inserted into the chassis 6. In the embodiment shown in the drawings, the reflection plate 3 is divided into two, four, and six parts. However, the reflection plate 3 may be divided more finely. Further, in the embodiment, the case where the reflecting plate constituting the reflecting plate 3 is formed in the same shape is shown, but not all the reflecting plate constitutings need be formed in the same shape.

[0018]

The backlight device of the present invention has the following effects.

(1) In the backlight device of the first aspect, since the reflector is divided into a plurality of reflectors, a large reflector can be formed from a plurality of smaller reflectors. A large molding die such as a molded reflector is not required. Further, the molding time can be shortened and the production efficiency can be increased. In addition, it is possible to prevent bending and the like inevitably occurring in the large reflector integrally molded.

(2) In the backlight device according to the second aspect, since a plurality of reflectors constituting the reflector are formed in the same shape, a large reflector can be formed without increasing the number of parts (types). Can be.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a backlight device.

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

FIG. 3 is an exploded perspective view of a reflection plate structure.

FIG. 4 is a side view showing the assembly of the reflector structure to the chassis.

FIG. 5 is an exploded sectional view of a main part.

FIG. 6 is a perspective view of a first modified example of the reflector structure.

FIG. 7 is a perspective view of a second modified example of the reflector structure.

FIG. 8 is a sectional view of a conventional example.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Backlight device, 2 ... Fluorescent tube, 3 ... Reflector, 4 ...
Diffusion plates, 21, 22,...

Claims (2)

[Claims] 1. A backlight device comprising: a luminous body; a reflecting plate made of a synthetic resin for reflecting light of the luminous body; and a diffusing plate for diffusing light from the luminous body and the reflecting plate. A backlight device characterized in that the reflector made of synthetic resin is formed by combining a plurality of reflector constructs. 2. The backlight device according to claim 1, wherein the reflectors are formed in the same shape.