JPS63301457A - Flat type fluorescent lamp - Google Patents

Abstract

PURPOSE:To avoid damage to a luminous surface in manufacturing processes by forming such a structure that electrode supporting bodies acting as current introducing bodies as well are put between two spacers each composing a square rod of glass and equalizing thickness of the spacers. CONSTITUTION:The device of the title includes a glass box formed by at least four square rods of glass disposed in a rectangle and put between a pair of flat plates of glass 1a, 1b, both fused with glass frit by heat, a pair of electrodes 4 disposed in the glass box, and at least two electrode supporting bodies 5 acting as current introducing bodies as well, each connected with each electrode 4. They form a structure in which each electrode supporting body 5 is put between two square rods of glass 2a, 2b, and thickness of the square rods of glass 2a, 2b is roughly the same. The electrodes 4 are thus diposed roughly in the middle of flat glass plates 1a, 1b, and damage to fluorescent substance 6 in manufacturing processes can be prevented.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to an arc tube structure of a flat fluorescent lamp used as a buff light for a liquid crystal display device, and in particular to a sealing structure of an electrode support that also serves as a current introducing body. It is related to.

[Prior art and its problems]

2. Description of the Related Art Liquid crystal display devices are in great demand as their performance improves and their cost decreases. The liquid crystal display device has two types: reflective type and transmissive type.
They are broadly divided into different types, but the latter type, which is a transmissive type, requires a backlight, and in particular, a light source that emits light with high brightness, uniformity, and evenness is required.

Flat fluorescent lamps satisfy the above conditions and are also thin, making them extremely promising light sources as backlights for liquid crystal display devices.

Figure 5 shows a simple structure of a flat fluorescent lamp formed from pre-formed molded glass and flat glass, and Figure 6 shows a pair of at least four glass prisms arranged in a square. An assembly diagram formed by sandwiching between flat glass plates is shown. In FIG. 5, 51 is a light-emitting surface made of a molded glass coated with a fluorescent substance, 52 is a light-emitting face made of a flat glass plate with a fluorescent substance 56 coated thereon, 53 is an exhaust pipe, and 54
is an electrode, and 55 is an electrode support that also serves as a current introducing body.

Further, in FIG. 6, 61 is a light emitting surface made of flat glass coated with a fluorescent substance, 62 is a spacer made of a glass prism, and 63
numeral 64 is an exhaust pipe, and 64 is an electrode support that also serves as a current introduction member, and an electrode is connected to the inner end thereof.

In the lamp with the structure shown in Fig. 5, the use of molded molded glass inevitably increases the price of the product, and in order to supply a flat fluorescent lamp suitable for the size of the liquid crystal display device, it is necessary to It was necessary to solve the problem of having to prepare enough molded glass to accommodate the various changes in the industry.

On the other hand, the flat fluorescent lamp having the structure shown in FIG. 6 uses flat glass, so it is low cost and has excellent flexibility with respect to changes in shape and dimensions. However, in conventional flat fluorescent lamps of this type, the current introducing body or electrode support is formed by using a flat glass 61 and a glass prism 6.
Since the electrodes are installed and fixed between the electrodes, the flat glass and the electrodes tend to come into contact with each other, which has the disadvantage that the fluorescent material coated on the flat glass is damaged during the manufacturing process.

[Means and actions for solving problems]

In order to eliminate the above-mentioned drawbacks, the present invention provides an electrode support that also serves as a current conductor between two glass prisms in a flat fluorescent lamp formed by sandwiching glass prisms arranged in a rectangular shape between a pair of flat glasses. The present invention provides a flat fluorescent lamp structure in which the electrodes are placed approximately in the center between the flat glasses by installing and fixing them with a glass lift, thereby preventing damage to the fluorescent material during the manufacturing process. A detailed explanation will be given below based on the drawings.

a publishing surface made of glass coated with a fluorescent substance 6, 2a;
2b is a pair of spacers made of prismatic glass made of the same material as the issuing surface; 3 is an exhaust pipe; 4 is an electrode; and 5 is an electrode support that also serves as a current introducing body.

The pair of issuing surfaces 1a and lb are heat welded by a glass lift (not shown) with the surface coated with the fluorescent substance 6 facing inside and spacers 'la and 2b and the exhaust pipe 3 sandwiched therebetween to form an airtight glass box. It is formed. Two pairs of electrode supports 5 are installed between a spacer 2a and another spacer 2b, and are firmly heat-welded by a glass lift at the same time when forming a glass box, and a pair of electrodes 4 are
It is supported by an electrode support 5 which also serves as an electrode introducing body.

In the above structure, if the thickness of each spacer is made the same, the electrode and electrode support will be installed approximately at the center in the thickness direction of the lamp, resulting in a uniform discharge path in a flat fluorescent lamp. It becomes easier to obtain. In addition, since the spacer allows the distance between the electrode and electrode support and the light emitting surface to be appropriately selected, contact with the fluorescent material deposited on the light emitting surface is prevented and damage to the light emitting surface is avoided. . FIG. 27 is a side view of a flat fluorescent lamp according to the present invention in which the spacers have the same thickness. FIG. 3 shows a side view of the lamp. Furthermore, FIG. 4 shows another embodiment of the invention.

It goes without saying that the above-mentioned effect can be obtained even if only the part where the electrode support is fixed is sandwiched between two glass prisms as shown in the figure.

〔Effect of the invention〕

As explained above, in a flat fluorescent lamp, the electrode support, which also serves as a current introducing body, is sandwiched between two spacers made of glass prisms, and the thickness of each spacer is made the same, so that the electrode and electrode support are It is placed approximately in the center of the lamp in the thickness direction, making it easier to obtain a uniform discharge (and also preventing contact with the fluorescent substance adhered to the light emitting surface, thereby preventing damage to the light emitting surface during the manufacturing process). It has great industrial utility value as it can be avoided.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a fluorescent surface showing an embodiment of the present invention. FIG. 4 is an exploded perspective view of a flat fluorescent lamp showing another embodiment of the present invention, and FIGS. 5 and 6 are exploded perspective views or assembled perspective views of conventional flat fluorescent lamps of the same type. . ■... Light emitting surface, 2... Spacer, 3... Exhaust pipe, 4... Electrode, 5... Electrode support, 6... Fluorescent substance, 7... Glass frit, 51 ... molded glass, 5
2... Flat glass, 53... Exhaust pipe, 54... Electrode, 55... Electrode support, 56... Fluorescent substance, 61
...Flat glass, 62...Spacer, 63...
Exhaust pipe, 64... electrode, 65... electrode support. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] A glass box formed by sandwiching at least four glass prisms arranged in a square shape between a pair of flat glasses and thermally welding them with a glass frit, a pair of electrodes installed in the glass box, and each A planar fluorescent lamp having at least two electrode supports that also serve as current introduction bodies connected to an electrode, wherein the electrode supports are sandwiched between two glass prisms, and the glass prisms have approximately the same thickness. A flat fluorescent lamp characterized by the following.