JP3173650B2 - Flat fluorescent lamp device and liquid crystal display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a flat fluorescent lamp device and a liquid crystal display device suitable for illuminating liquid crystal display means and the like.

[0002]

2. Description of the Related Art A conventional fluorescent lamp device is described, for example, in Japanese Utility Model Application Laid-Open No. 58-130352 (conventional example). This fluorescent lamp device will be described with reference to FIG.

FIG. 6 is a perspective view of a conventional fluorescent lamp device. A fluorescent lamp 1 having a substantially U-shaped light emitting portion
At one end thereof, a protective cap 2 attached to the outer periphery of the exhaust pipe is provided. The cap 2 is attached to the mounting base 4 by being held in a holding piece 3 provided on the mounting base 4.

The electrode lead pieces 5... Led out horizontally from the other end of the fluorescent lamp 1 to the outside are mounted on a mounting base 4.
The fluorescent lamp 1 is inserted into each of the insertion openings 6a of the base socket 6 fixed above to fix the other end of the fluorescent lamp 1, and is electrically connected to the lighting circuit via the base socket 6.

[0005]

However, in such a fluorescent lamp device, when it is incorporated in a device such as a liquid crystal display device, both the fluorescent lamp device and a lighting circuit component (not shown) are fixed. Therefore, a wasteful space is easily formed between the two in terms of design. In addition, the proportion of both devices including this space becomes large, and it is difficult to make the entire device compact.

[0006] Further, it is necessary to form fixing means in the equipment to support both of them. As a result, since the assembling work must be performed separately for both, the assembling work is troublesome and takes a long time, and the manufacturing cost increases.

[0007] Further, it is necessary to perform an assembling operation in two stages of an electrical connection operation between the fluorescent lamp and the lighting circuit component and a fixing operation between the printed wiring board and the like and the fluorescent lamp, and the assembling time also becomes long. Furthermore, since a special fixing member is used for fixing, the manufacturing cost increases.

Further, since a fluorescent lamp having a U-shaped light-emitting portion or a straight tube-shaped fluorescent lamp is used, it is difficult to irradiate the flat liquid crystal display means efficiently and uniformly. Compact cannot be achieved.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a flat fluorescent lamp device in which the entire fluorescent lamp device is reduced in size and the assembling time and the manufacturing cost are reduced, and a liquid crystal display device using this device. .

[0010]

SUMMARY OF THE INVENTION According to the present invention, there is provided a transparent glass comprising a flat glass and a refractory shallow dish having a concave portion formed in a peripheral portion joined to the flat glass. A light-tight container, an electrode disposed in the shallow dish-shaped body, and electrically connected to the electrode, a part of which is disposed in a concave portion of the light-transmitting airtight container and led out. And a substrate that is electrically and mechanically connected to the lead wire of the flat fluorescent lamp.

According to a second aspect of the present invention, in the flat fluorescent lamp device according to the first aspect, the substrate has a size substantially equal to an outer dimension of the flat fluorescent lamp, and is provided on a rear surface of the flat fluorescent lamp. It is characterized by being attached.

According to a third aspect of the present invention, in the flat fluorescent lamp device according to the second aspect, electrical components are mainly mounted on a surface of the substrate opposite to the flat fluorescent lamp. .

According to a fourth aspect of the present invention, there is provided a flat-type fluorescent lamp according to any one of the first to third aspects, wherein the flat-type fluorescent lamp is disposed on a back surface of the liquid-crystal display means. And a lamp device.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A flat fluorescent lamp device according to an embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view of a flat fluorescent lamp device showing an embodiment of the present invention, FIG. 2 is a perspective view thereof, FIG. 3 is a plan view thereof, FIG. 4 is a rear view thereof, and FIG. It is a perspective view of a modification.

In the figure, a flat fluorescent lamp device 61 is shown.
A translucent hermetic container 17 including a flat glass 15 and a refractory shallow dish having a concave portion formed in a peripheral portion joined to the flat glass 15; The electrodes 18 and 19 disposed in the
The lead wires 18a, 18b, 19a, 19b are electrically connected to the light-transmitting airtight containers 8 and 19, and are partially disposed in the concave portions of the light-transmitting airtight container 17 and led out to the outside. It has substantially the same external dimensions as the container 17 and
A lighting circuit board 13A, which is a board attached to the back surface of 7;
It mainly has a lighting circuit component 22 which is an electric component mounted on the surface of the substrate opposite to the fluorescent lamp side. The above-mentioned electrodes 18 and 19 are, for example, a pair of electrodes such as hollow cathode type cold cathodes, which are arranged opposite to each other with a space therebetween. Electrode lead pieces 18a, 18b, 19a, and 19b, which are conductors and are strip-shaped lead wires, are electrically connected to both ends of the pair of electrodes in the axial direction.

The translucent airtight container 17 is formed of a front plate 14 which forms a light emitting surface by coating a fluorescent film on the inner surface of a transparent flat glass, and a plate glass of substantially the same shape and size as this. A back plate 15 which is a flat glass which is a flat back surface and is a non-light emitting surface, and a rectangular frame spacer 1
6 and a refractory shallow dish-shaped body.
A predetermined amount of mercury and a rare gas such as argon gas are sealed in the translucent airtight container 17.

A back plate 15 having no light emitting surface is provided.
On the side surface of each of the lead pieces 18a,
Rectangular recesses 62, 62, 62, 62 are formed in portions where the inner surfaces of 18b, 19a, 19b are in contact.

The width of each of the recesses 62 is approximately equal to the width of each of the lead pieces 18a, and the length thereof is formed to be the entire length of the back plate 15 in the thickness direction. The depth of each of the recesses 62 is formed larger than the thickness of each of the lead pieces 18a. As shown in FIGS. When bent, the outer surface of each of the lead pieces 18a... Bites inward from the outer surface of the back plate 15 to prevent it from protruding outward.

The reason is that, when each of the lead pieces 18a... Rises in a substantially vertical direction and protrudes outward from the outer surface of the back plate 15, the outer shape of the flat fluorescent lamp device 61 connecting these protruding ends is changed. This is to increase the size and prevent dead space formed around each protruding end.

As shown in the drawing, an arc-shaped inner concave portion 63a is formed in the upper end surface of the spacer 16 in the figure so that each lead piece 18a is inserted outwardly. In the outer portion, rectangular outer concave portions 63b each having a depth slightly larger than each inner concave portion 63a are formed, and these inner and outer concave portions 63a and 63b are adjacent to the inside and the outside.

Therefore, each of the lead pieces 18a is horizontally inserted into each of the inner recesses 63a and led out to fill the inner and outer recesses 63a and 63b with, for example, frit glass. Can be hermetically sealed.

After the sealing, the protruding ends of the respective lead pieces 18a are bent substantially perpendicularly from the base ends thereof toward the back plate 15 to be substantially upright.

Therefore, since each lead piece 18a rises while being sealed in each of the recesses 63a, 63b, the outer surface of each lead piece 18a is prevented from protruding outward from the outer surface of the back plate 15. can do.

The lighting circuit board 13A is arranged concentrically on the upper end of the back plate 15 as shown in FIG. 4, and each lead piece 18a projecting upward from the upper surface of the lighting circuit board 13A. The protruding end of the lighting circuit board 18
Each of the A electrical terminals 23a, 23a is bent inward at a substantially right angle inward and connected.

As a result, the lighting circuit board 13A is held and integrated by the flat fluorescent lamp by the respective lead pieces 18a, and is electrically connected through the electric terminals 23a. Therefore, in the present embodiment, each of the lead pieces 18a can be inserted into each of the recesses 63a, 63b, and can be prevented from protruding outward from the outer surface of the back plate 15. Further, the dead space of the flat fluorescent lamp device 61 can be eliminated, and the size can be further reduced. As a result, for example, it is possible to save installation space when assembling the liquid crystal display device or the like as a liquid crystal display means.

In this embodiment, as shown in FIG. 2, each lead piece 18a is sealed in each of the recesses 63a and 63b and then raised, and as shown in FIG.
May be filled with the frit glass 64 to electrically insulate the outer surfaces of the lead pieces 18a.

However, in this case, the outer surface of each frit glass 64 is set substantially flush with the outer surfaces of the back plate 15 and the spacer 16 and must not project outward.

[0029]

According to the flat fluorescent lamp device of the first aspect,
Since a part of the lead wire is arranged in the recess formed in the light-transmitting airtight container, the thickness of the entire flat fluorescent lamp can be reduced by the thickness of the lead wire, and the size can be reduced. it can. Further, the substrate can be mechanically connected to the lead wire.

In the flat fluorescent lamp device according to the second aspect, in addition to the effect of the first aspect, since the substrate is attached to the rear surface of the flat fluorescent lamp, the combined thickness of the two can be reduced. Can be. Further, since the distance between the mounting substrate and the fluorescent lamp can be minimized, high-frequency leakage current can be reduced and noise can be reduced. Furthermore, since the fluorescent lamp and the mounting board have substantially the same dimensions, the overall size can be further reduced.

In the flat fluorescent lamp device according to the third aspect, since the electric components are mainly mounted on the surface of the substrate opposite to the flat fluorescent lamp, there is no need to use a separate mounting substrate, and the cost is reduced. And miniaturization can be achieved.

In the liquid crystal display device according to the fourth aspect, the flat fluorescent lamp device in which the fluorescent lamp is disposed on the back of the liquid crystal display means can illuminate the liquid crystal display means from the back.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a flat fluorescent lamp device according to an embodiment of the present invention.

FIG. 2 is a perspective view of the same.

FIG. 3 is a plan view of the same.

FIG. 4 is a rear view of the same.

FIG. 5 is a perspective view of a modification.

FIG. 6 is a perspective view of a conventional fluorescent lamp device.

[Explanation of symbols]

 61 flat fluorescent lamp device 17 translucent airtight container 13A lighting circuit board 18a, 18b, 19a, 19b lead wire 62 recess

Continuation of the front page (56) References JP-A 61-121655 (JP, U) JP-A 63-117050 (JP, U) JP-A 2-78981 (JP, U) JP-A 57-43310 (JP) , Y2) (58) Fields investigated (Int. Cl. ⁷ , DB name) F21V 23/00 390 H01J 61/30 G09F 9/00

Claims (4)

(57) [Claims] 1. A flat glass and a contact with the flat glass.
Refractory shallow dish with a concave part formed on the periphery
Translucent airtight container including the body and this shallow dish
The electrode arranged in the inside and electrically connected to this electrode
And a part is disposed in the concave portion of the translucent airtight container.
Flat fluorescent lamp having a lead wire led out to the outside.
Light lamp; electrical and mechanical to the lead wire of the flat fluorescent lamp
And a substrate connected to the fluorescent lamp. Wherein said substrate, said has outer dimensions substantially equal to the dimensions of the flat fluorescent lamp, the planar form of claim 1, wherein the being spliced to the rear of the plane fluorescent lamp Fluorescent lamp device. 3. The flat fluorescent lamp device according to claim 2 , wherein electric components are mainly mounted on a surface of the substrate opposite to the flat fluorescent lamp. 4. A liquid crystal display device; and a flat type fluorescent lamp device according the any one of from the plane fluorescent lamp claims 1 disposed so as to be positioned 3 to the back of the liquid crystal display unit; the A liquid crystal display device comprising: