JPH0750144A - Fluorescent character display tube - Google Patents

Abstract

PURPOSE:To increase the pressure strength of a display tube and to improve the space factor without increasing the thickness of the material of a cover glass sheet by providing a rib on a part of the front glass inner wall of the cover glass sheet. CONSTITUTION:The side surface glass sheet 8 and the front glass sheet 9 of a cover glass sheet are fixed to one another and are formed by a frit glass piece 10, and a rib 12 made of glass is formed on the inner wall of the glass sheet 9. A filament 3 for discharging thermion and a grid 4 for accelerating and controlling the discharged thermion are provided on the inside of the container which is enclosed in vacuum by the cover glass sheet and a glass base 2, and a wiring part 11 and a phosphor 5 are formed on the base 2. In the case of an integrated formation glass sheet, for which a glass plate is heated and softened, and is filled into a mold having a desired outer shape to form the glass sheet, the rib 12 is provided on the inner surface of the integrated formation cover glass simultaneously at the time of forming the cover glass. A fluorescent character display tube of good space factor is thus manufactured, in which the strength of the container is increased. A large display can thus be manufactured from a thin glass plate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluorescent display tube, and more particularly to the structure of a cover glass.

[0002]

2. Description of the Related Art In a conventional fluorescent display tube, as shown in FIG. 4 (a), thermoelectrons emitted from a filament 3 are stored in a container which is vacuum-sealed by a cover glass 1 and a glass substrate 2.
Acceleration was performed by the grid 4 to which a direct current or a pulse voltage was applied, and the fluorescent material 5 applied on the glass substrate 2 in the shape of the pattern to be displayed was caused to emit light.

The cover glass used for this fluorescent display tube is formed by fixing a windshield 9 and a side glass 8 with a seal glass 10 as shown in FIG. 4 (b). Further, the inner wall of the windshield 9 was flat.

On the other hand, the wiring part 11 of the display pattern covered with the phosphor 5 shown in FIG. 5 (b) is formed into a slit or a mesh so that the emitted light is transmitted to the back surface and the desired pattern is displayed from the back surface. As shown in FIG. 5 (a), the cover glass used in the fluorescent display tube of the mold had the windshield 9 and the side glass 8 integrally formed, and the inner wall surface thereof was flat.

[0005]

As described above, in the conventional cover glass for a fluorescent display tube, when the glass substrate and the vacuum container are formed, the container needs to have strength to withstand atmospheric pressure. If the cover glass is made thicker to increase the strength of the vacuum container, the vacuum container becomes heavier and the space factor becomes worse. For example, when the side glass is thickened, there is a problem that the display patternable area becomes small due to the restriction of the space of the contact terminal which is the contact portion between the internal grid or the anode and the external lead.

An object of the present invention is to provide a fluorescent display tube in which the pressure resistance of the display tube can be increased without increasing the thickness of the cover glass and the display patternable area is not reduced. It is in.

[0007]

In the cover glass for a fluorescent display tube according to the present invention, a rib is provided on a part of the inner wall of the windshield. Further, in integrally molded glass formed by heating and softening plate glass into a mold having a desired outer shape, ribs are simultaneously provided on the inner wall of the integrally molded cover glass during formation.

[0008]

The present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a cover glass and a cross-sectional view of a fluorescent display tube according to an embodiment of the present invention. As shown in FIG. 1, on a glass substrate 2, a cover glass 1 and a glass substrate 2 are provided in a vacuum-tight container with a filament 3 that emits thermoelectrons and a grid 4 that accelerates and controls the emitted thermoelectrons. Then, the wiring layer 11 and the phosphor 5 are formed.

Further, in the cover glass 1, a side glass 8 and a windshield 9 are fixedly formed by a seal glass 10, and a rib 12 is provided on the inner wall of the windshield 6 by the glass. FIG. 2 is a perspective view of the cover glass of Example 2 in which the shape of the rib 12 is changed and a cross-sectional view of the fluorescent display tube.

FIG. 3 is a perspective view of the cover glass and a cross-sectional view of the fluorescent display tube of the third embodiment. In the cover glass 1 shown in the figure, a side glass 8 and a windshield 9 are integrally formed, and a rib 12 is formed integrally with the cover glass 1 on the inner wall of the windshield 9.

In the cover glass 1 having the ribs 12 shown in the figure, the wiring portion 11 of the display pattern covered with the phosphor 5 is formed into a slit or a mesh so that the emitted light is transmitted to the back surface and desired from the back. Since it is used for a backside light emitting type fluorescent display tube for displaying the pattern, there is no influence on the displayed pattern.

[0012]

As described above, according to the present invention, by providing the rib on the inner wall of the cover glass used for the fluorescent display tube, the strength of the container can be increased and a fluorescent display tube having a good space factor can be manufactured. .. In other words, it is possible to make a lightweight and large-sized display with thin glass.

[Brief description of drawings]

FIG. 1 is a perspective view of a cover glass for one embodiment of the present invention and a cross-sectional view of one embodiment using the same.

FIG. 2 is a perspective view of a cover glass for another embodiment of the present invention and a sectional view of a fluorescent display tube using the same.

FIG. 3 is a perspective view of a cover glass for a third embodiment of the present invention and a cross-sectional view of a fluorescent display tube using the same.

FIG. 4 is a perspective view of an example of a conventional fluorescent display tube, a perspective view of a cover glass used for the fluorescent display tube, and a cross-sectional view of (a).

FIG. 5 is a perspective view of a cover glass for another example of a conventional fluorescent display tube and a sectional view of a fluorescent display tube using the cover glass.

[Explanation of symbols]

 1 Cover Glass 2 Glass Substrate 3 Filament 4 Grid 5 Phosphor 6 Lead 7 Contact Terminal 8 Side Glass 9 Front Glass 10 Seal Glass 11 Wiring 12 Rib

Claims (2)

[Claims] 1. An anode by accelerating thermoelectrons emitted from a filament by a direct current or a pulse voltage in a container which is vacuum-sealed with a cover glass and a glass substrate.
A fluorescent display tube for displaying a desired pattern by causing a phosphor applied in the shape of the pattern to be displayed to collide and emit light, wherein a rib is provided on the inner wall of the cover glass. 2. The cover glass is an integrally molded cover glass formed by heating and softening a plate glass into a molding die having a desired outer shape, and ribs are simultaneously provided on the inner wall of the integrally molded cover glass. The fluorescent display tube according to claim 1, wherein: