JPH0641426Y2 - Lighting equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a lighting device for a liquid crystal display device.

[Conventional technology]

Secondly, the illumination device built into the conventional liquid crystal display device is
It is shown in FIG. 2 (a) and FIG. 2 (b). FIG. 2 (a) is a plan view of a conventional lighting device, and FIG. 2 (b) is a rear view. In FIG. 2 (a), the U-shaped fluorescent tube 22 having the bent portion 22b is fixed to the reflecting surface 21a of the reflecting plate 21 by an adhesive tape 26 or silicon adhesive, and further, a sponge tape 25 is used to fix both of them from the top. The end 22a is fixed. Two temperature fuses 23, which measure the temperature of the fluorescent tube 22 to detect the life of the fluorescent tube, are installed in parallel with the fluorescent tube 22, and the exposed terminals of the thermal fuse 23 are protected by a short-circuit prevention tube 24.

In FIG. 2B, the terminal portion of the thermal fuse 23 protected by the short-circuit prevention tube 24 and the fluorescent tube terminal 29 are
The lighting wiring board 28 crimped to the reflector 21 is connected by soldering, and the unprotected terminals of the temperature fuse 23 are connected by soldering. A lead wire 27 is connected from the illumination wiring board 28 to an illumination circuit (not shown).

[Problems to be solved by the device]

The life of the fluorescent tube 22 built into the lighting device of the liquid crystal display device is about 1000 to 2000 hours, and the replacement work of the fluorescent tube 22 must be kept in mind as after-sales service. In the conventional liquid crystal television lighting device shown in FIG.
When replacing 22, adhesive tape 26 and sponge tape 25
However, since the fluorescent tube 22 must be replaced and the positioning of the fluorescent tube 22 is difficult, the entire lighting device must be replaced, and the user was forced to incur an unnecessary repair cost. In addition, the number of parts is large, the cost of the lighting device itself is increased, and the product unit price is affected.

Further, the assemblability was poor, and there were many problems such as difficulty in laterally positioning the fluorescent tube 22.

An object of the present invention is to provide a lighting device which has a smaller number of parts than the conventional lighting device, can be easily assembled by anyone, and enables replacement of only the fluorescent tube in after-sales service.

[Means for solving the problem]

In order to achieve the above-mentioned object, the structure of the present invention is a liquid crystal panel illuminating device in which a liquid crystal panel is built in, and the fluorescent tube is arranged in a plane parallel to the back surface of the liquid crystal panel. A lighting device is constituted by a reflecting member for reflecting the light emitted by the liquid crystal panel side to the liquid crystal panel side, and an illumination wiring board for wiring the terminals of the fluorescent tubes, and the reflecting member has a flat portion. A frame portion, a concave reflecting surface portion formed inside the mounting frame portion and having both ends opened for housing the fluorescent tube, and an end portion of the fluorescent tube formed at one end of the reflecting surface portion and housing the fluorescent tube end portion. A fluorescent tube holding part having a shape, and an illumination wiring board pressing part formed at both ends of the fluorescent tube holding part in the mounting frame part, the fluorescent tube is projected from both end openings of the reflecting surface part, And of the fluorescent tube With the portion positioned in the fluorescent tube holding portion and housed in the reflecting surface portion, the end portion of the fluorescent tube is held between the fluorescent tube holding portion and the lighting wiring substrate by attaching the lighting wiring board to the lighting wiring board pressing portion. It is characterized by what was done.

〔Example〕

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. 1 (a), 1 (b) and 1 (c) all show the lighting device of the present invention, wherein FIG. 1 (a) is a sectional view and FIG. 1 (b). ) Is an external perspective view seen from the upper surface, and FIG. 1C is an external perspective view seen from the lower surface. Fig. 1 (a)
As shown in, a reflective member is provided on the back of the liquid crystal panel 33 and the diffusion plate 34.
11 are arranged, and the fluorescent tube 12 is installed on the upper surface of the reflecting member 11. The liquid crystal panel 33 and the diffusion plate 34 are omitted in FIGS. 1 (b) and 1 (c). As shown in FIG. 1B, the fluorescent tube 12 is supported in the vertical direction by inserting one U-shaped bent portion 12a into the opening portion 11c of the reflecting member 11, and the other end portions 12b of the other fluorescent tube 12 are provided. Is held so as to be sandwiched by the reflecting member 11 via the fluorescent wiring holder 11a and the illumination wiring board 18 inserted in the illumination wiring board pressing portion 11e. The reflection member 11 is formed of a high temperature resistant resin such as white polypropylene having high reflection efficiency and has a reflection surface portion 11b having a quadric surface such as a parabola or a hyperbola or a pseudo quadric surface.

Further, as shown in FIG. 1 (c), the illumination wiring board 18
Is positioned and held by a positioning rib 11d formed on the illumination wiring board pressing portion 11e of the reflection member 11, and the fluorescent tube terminal 14 is connected to the illumination wiring board 18 by soldering.

Further, the lead wire 13a of the thermal fuse 13 makes contact with the end portion of the fluorescent tube 12 through the cutout portion 11f provided in the fluorescent tube holding portion 11a, and is connected and fixed by soldering to the illumination wiring board 18. To be done. The lighting wiring board 18 and a lighting circuit (not shown) are connected by a jumper wire 17.

Next, a procedure for assembling the lighting device will be described. First, the reflection member
The reflecting surface 11b of the fluorescent lamp 11 is placed upward, the bent portion 12a of the fluorescent tube 12 is passed through the opening 11c, and then both ends of the fluorescent tube 12 are stored in the fluorescent tube holding portion 11a. The illumination wiring board 18 to which the jumper wires 17 have been soldered in advance is inserted from the direction of arrow A between the illumination wiring board pressing portion 11e and the fluorescent tube holding portion 11a of the reflecting member 11 as shown in FIG. 1 (b). Rib 11d for positioning at this time
Does not interfere with the insertion.
Bend 11e up to make it easier to insert. At this time, the fluorescent tube 12 has a bent portion 12a inserted into the opening 11c to position the longitudinal direction and both ends 12b of the fluorescent tube 12 have a fluorescent tube holding portion 11a.
And the illumination wiring board pressing portion 11e are sandwiched and positioned. Next, as shown in FIG. 1 (c), the lighting device is turned upside down and the fluorescent wiring terminal 14 is arranged so that the fluorescent tube terminal 14 is not slackened.
Solder to. As a result, both ends of the fluorescent tube 12 hit the flange portions 11g of the fluorescent tube holding portion 11a and are positioned. Then, the lead wire 13a of the thermal fuse 13 is passed through the cutout portion 11f provided in the fluorescent tube holding portion 11a, so that the fluorescent tube 12
And the lighting wiring board 18 is soldered to complete.

To replace the fluorescent tube 12, remove the fluorescent tube terminal 14 from the illumination wiring board 18, remove the fluorescent tube 12 from the opening 11c, and replace the new fluorescent tube 1
2 is inserted as described above, and the fluorescent tube terminal 14 is soldered again to the illumination wiring board 18 so that there is no slack, and the process is completed.

[Effect of device]

As described above, according to the present invention, the reflecting member has an opening for holding the bent portion of the fluorescent tube, a fluorescent tube holding portion for holding both ends of the fluorescent tube, and an illumination wiring board. The lighting wiring board pressing portion is integrally formed, the lighting wiring board is sandwiched between the fluorescent tube holding portion and the lighting wiring board pressing portion, and both ends of the fluorescent tube are formed by the fluorescent tube holding portion and the lighting wiring board. Since the structure is sandwiched, the number of parts is smaller than that of the conventional lighting device, the structure is extremely easy to assemble, the cost of the lighting device itself is low, and it is possible to supply cheap products for consumers, and It is possible to provide a lighting device in which the fluorescent tube can be easily replaced even when it reaches the end of its life, and the fluorescent tube can be repaired at the cost of exchanging the fluorescent tube and the cost burden on the consumer can be reduced.

In addition, since the temperature fuse is provided by providing holes, notches, etc. in the fluorescent tube holding portion, when the life of the fluorescent tube is reached,
The temperature of both ends of the fluorescent tube, which becomes high, can be reliably detected, and the reflecting member and the illumination wiring board can be protected from abnormal heat generation of the fluorescent tube.

Further, in the conventional illumination structure, the bent portion of the fluorescent tube is much darker than other portions, and when the image is viewed, the color seems to be different. It is effective for preventing unevenness of the illumination brightness by setting the bent portion having low illumination brightness outside the illumination range.

[Brief description of drawings]

1 (a), 1 (b) and 1 (c) all show the lighting device of the present invention, and FIG.
Is a cross-sectional view, FIG. 1 (b) is an external perspective view seen from the upper surface, FIG. 1 (c) is an external perspective view seen from the lower surface, and FIG. 2 (a) is a plan view of a conventional lighting device. 2 (b) is a rear view. 11 …… Reflecting member 11a …… Fluorescent tube holding part 11d …… Rib part 11e …… Lighting wiring board pressing part 11g …… Brim part 12 …… Fluorescent tube 12a …… Bending part 12b …… Both ends 13 …… Thermal fuse 18: Lighting wiring board

Claims (1)

[Scope of utility model registration request] 1. A lighting device for a liquid crystal panel, comprising a liquid crystal panel and arranging the fluorescent tube in a plane parallel to the back surface of the liquid crystal panel, wherein the fluorescent tube and light emitted from the fluorescent tube are provided on the liquid crystal panel side. And a mounting member having a flat portion, and a mounting member having a flat portion, and a mounting member having a flat portion. A fluorescent tube holding portion having a concave reflecting surface portion formed on the inner side of the fluorescent lamp and having both ends open for housing the fluorescent tube, and a shape formed at one end of the reflecting surface portion for housing the end portion of the fluorescent tube. And an illumination wiring board holding portion formed at both ends of the fluorescent tube holding portion in the mounting frame portion, the fluorescent tube is projected from both end openings of the reflection surface portion, and the end portion of the fluorescent tube is Positioned on the fluorescent tube holder While housed in the reflective surface portion Te, lighting apparatus, characterized in that the ends of the fluorescent tube by attaching the lighting circuit board to the illumination wiring substrate pressing portion and sandwiched between the fluorescent tube holder and the illumination circuit board.