JPS63232260A - Plane type fluorescent lamp - Google Patents

Abstract

PURPOSE:To obtain the uniform luminance of a fluorescent lamp eliminating the nonuniformity of luminance even when a reinforcing glass member is used by making the said reinforcing glass member with a cylinder on the inner surface of which a fluorescent film is produced and providing an auxiliary electrode on a discharge electrode so as that the said auxiliary electrode is positioned in the said reinforcing glass member. CONSTITUTION:Reinforcing glass members 9, 9 are made with a cylinder on the inner surface of which a fluorescent film 10 is produced, and auxiliary electrodes 7a, 7a, 7b, 7b are provided on discharge electrodes 7, 7 respectively so as that the said auxiliary electrodes are positioned in the reinforcing glass members 9, 9 respectively. When the lamp is operated, the fluorescent film 10 produced on the inner surface of the reinforcing glass member 9 is excited by the discharge through the 2nd. auxiliary electrode 7b to emit light, and the said light is emitted to the outside through the said glass member 9, uncoated portion 5 and the upper glass plate 1. Thereby the uniform luminance can be obtained over the whole luminous surface eliminating falling off of luminance on the portion faced to the said reinforcing glass member.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a flat fluorescent lamp suitable as a bank light for a liquid crystal display device or a liquid crystal TV device in a word processor or a personal computer.

(b) Prior Art Liquid crystal panels have the advantage of being lightweight and consuming little power, and are therefore widely used as display devices for personal computers, word processors, etc. in addition to liquid crystal TVs. On the other hand, since the liquid crystal itself does not emit light, it is necessary to use a flat fluorescent lamp as described in, for example, Japanese Utility Model Application No. 111985/1985 (93D311) as a backlight.

In addition, the size of the above-mentioned liquid crystal panels has been increasing in recent years, and for example, A4 size panels are now being used, and it has become necessary to increase the size of the flat fluorescent lamps used in such large liquid crystal panels. . However, if the size of the glass container is increased, a thick glass plate must be used to prevent implosion due to atmospheric pressure, which has the disadvantage of hindering lightweight and #-shaped containers.

I am busy trying to solve the above drawbacks, so I filed the patent application in 1986.
No. 1-54194 proposes a flat fluorescent lamp that increases pressure resistance and enables thinning by arranging reinforcing glass between a pair of opposing upper and lower flat glasses.

However, when relatively inexpensive Ng glass, lead glass, borosilicate glass, etc. are used as the reinforcing glass, ultraviolet rays (253
7A) cannot be transmitted. Therefore, since the fluorescent film applied to the inner surface of the upper flat glass that the reinforced glass faces does not emit light, this fluorescent film blocks light, reducing the brightness of the portion of the light emitting surface where the reinforced glass is located. Uneven brightness occurs.

(c) Open chain point to be solved by the invention The present invention has been made in view of the above points, and provides a flat fluorescent lamp that can provide uniform brightness without causing uneven brightness even when reinforced glass is used. It is something to do.

2) Means for solving the problem of rough spots The present invention uses a reinforcing glass having a cylindrical shape with a fluorescent film formed on its inner surface, and an auxiliary electrode ft is provided on the discharge electrode, and this auxiliary electrode is connected to the reinforcing glass. It is located inside the glass.

(E) Function In the present invention, the fluorescent film inside the reinforced glass tube is excited by the discharge of the auxiliary electrode and emits light.

(f) Example An embodiment of the present invention will be described below with reference to the drawings.

Figures 1 (a), (b), and (c) are plan views of the flat fluorescent lamp in this embodiment, A-p: sectional view, B-B' sectional view, and Figure 2 is a perspective view of discharge poles; FIG. 6 is an enlarged sectional view of the reinforced glass.

In the figure, (11 + 21 is an A4 size (278 m x 192 gourd) upper and lower flat glass with a fluorescent film (31 < 41) formed on its inner surface, and the fluorescent film (3) is a slit-shaped uncoated glass * 15 + +5) Furthermore, the upper surface of the upper flat glass (1) is roughened.

Reference numeral (6) is a mouth-shaped frame glass that maintains a predetermined distance between the upper and lower flat glasses, and constitutes a glass container together with the upper and lower flat glasses.

17) +71 is a discharge electrode with a square cross section as shown in Fig. 2, and on both sides there are flat first auxiliary electrodes (71 (7a) and later described) for promoting discharge at the ends. A rod-shaped second auxiliary electrode (7b) (a part of which is inserted into the reinforced glass)
7b) is formed extensively.

+81+81 are connected to the first auxiliary electrodes by spot welding and protrude to the outside w'rI! It is an IIL-shaped lead piece, and in addition to its electrical function, it also has the function of mechanically supporting the discharge electrode.

+9)! 9) is a cylindrical reinforced glass whose height is equal to the gap between the upper and lower flat glasses, as shown in FIG. 6, to prevent implosion. This reinforcing glass is fixed to the upper flat glass (2) with frit glass, and the uncoated portion is also attached to the upper flat glass (1). 5) Facing along (5). In addition, the inner surface of the reinforced glass (9) has a fluorescent film (
10) is formed, and 110'fi! Due to the discharge of the second auxiliary electrode, light can be emitted even within the reinforced glass tube.

(11) is a tip tube whose tip is sealed by thermal fusion after evacuating the air inside the glass container and allowing argon gas and mercury to flow therein.

Next, I will explain the assembly procedure of the above-mentioned flat curved fluorescent lamp.

First, upper and lower flat glass plates +11 (uncoated portions !51 !5 on each inner surface of 21) are cut and fluorescent films +31 +41 are formed by screen printing. Then, the upper flat glass (2
) in place on the frit glass, reinforced glass T9H9
1 and the chip piece +81 +81 are placed on the discharge electrodes (7) (7), and then the frame glass (6), the chip tube (11) and the upper flat glass (1) are placed together with the frit glass. Then, a sealed glass container is formed by heat fusion.

Finally, the air inside the container is evacuated through Chip Tube Co., Ltd., and argon gas and mercury are introduced into the container, and then the tip is heat-sealed to seal it.

When the flat fluorescent lamp described above is in operation, the fluorescent film 110 inside the reinforcing glass (9) is excited by the discharge of the second auxiliary electrode (7b) and emits light. (5) and the upper flat glass (1) and is emitted to the outside, so on the light emitting surface, the reinforced glass (9) (9)
[The brightness of the area to be repaired will not decrease.]

(G) Effects of the Invention As described above, according to the present invention, since the reinforced glass itself emits light, uniform brightness can be obtained on the light-emitting surface without any reduction in brightness at the portion where the reinforced glass is located. Therefore, it is particularly effective as a butterfly light for display devices such as liquid crystal TVs, personal computers, and word processors.

[Brief explanation of the drawing]

Figures 1 (a), (b), and G = plan view, A-AI' sectional view, and B-13 of a flat fluorescent lamp according to an embodiment of the present invention.
2 is a perspective view of the discharge electrode, and FIG. 6 is an enlarged sectional view of the reinforced glass. (11 (21・l upper flat glass, (31+4) (1G
-...Fluorescent film! 51 (51... uncoated area, (6)
...Frame glass, +71171...Discharge electrode, (7a
) (71)・”First auxiliary electrode, (7b) (7b)・
...Second auxiliary electrode, +9)+9)...Reinforced glass.

Claims (1)

[Claims] (1) A pair of discharge electrodes are disposed facing each other in a glass container in which a pair of flat glasses each having a fluorescent film formed on the inner surface face each other at a predetermined distance, and the distance between the pair of flat glasses is approximately equal to the distance between the pair of flat glasses. In a flat fluorescent lamp in which reinforcing glass having the same height is arranged substantially parallel to a line connecting the pair of discharge electrodes, the reinforcing glass is a cylindrical one having a fluorescent film formed on its inner surface. In addition, a flat fluorescent lamp is provided with an auxiliary electrode on the discharge electrode, and the auxiliary electrode is located inside the reinforcing glass.