JPH04322044A - Fluorescent display tube - Google Patents

Abstract

PURPOSE:To thin and lighten a fluorescent display tube by forming cover glass out of a piece of glass plate in an integrated manner, and by providing a thick part on the corner part. CONSTITUTION:In a fluorescent display tube for observing a display pattern from the side of a substrate 1, in which a cover glass 12 is sealed on the translucent anode substrate 1 on which the display pattern is formed, a thick part 13 is provided in the cover glass 12 on the corner part, and the cover glass is thus formed out of a piece of glass plate in an integrated manner. The pressure intensity of the cover glass 12 is improved, and a thickness of a fluorescent display tube correspondent to enlarged panel size is thus thinned and reduced in the weight.

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 a fluorescent display tube in which display patterns are observed from the anode substrate side.

0002

2. Description of the Related Art Conventionally, the cover glass of a fluorescent display tube with a structure in which the display pattern is observed from the anode substrate side is a combination of two types of glass parts, a display surface glass 8 and a spacer glass 9, as shown in FIG. The structure was sealed with low melting point glass.

0003

[Problems to be Solved by the Invention] In order to meet the needs of fluorescent display tubes, where the display capacity is increasing year by year and the panel size is also increasing, it is necessary to improve the pressure resistance of the cover glass and increase the size of the fluorescent display tube. It is essential to keep the thickness as thin as possible even if the size is increased. Moreover, it is no exaggeration to say that this holds the key to making many electronic devices that use fluorescent display tubes more compact and lightweight.

However, in conventional fluorescent display tubes in which display patterns are observed from the anode substrate side, the cover glass used therein has a structure that combines two types of parts: a display surface glass and a spacer glass. As the panel size increases, the only way to improve its pressure resistance is to adjust the thickness of the display glass or the glass used as spacer glass. There were problems in that the display glass and spacer glass of the product were thicker, and the product was also heavier.

An object of the present invention is to provide a fluorescent display tube that can be made thinner and lighter.

[0006]

[Means for Solving the Problems] The present invention includes a translucent anode substrate, a display pattern formed on the anode substrate, a filament stretched across the display pattern at intervals, and a display pattern formed on the anode substrate. and a grid disposed in the middle of the display pattern, and a display surface glass that is sealed to the anode substrate via a spacer glass to form a cover glass, and the display pattern is observed from the anode substrate side. In the display tube, the cover glass is integrally formed from a single glass plate, and has thick-walled portions at the corners.

[0007]

Embodiments Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, an aluminum thin film is formed on a glass substrate 1 by sputtering, an aluminum stripe electrode 3 is formed by photoetching, and an aluminum thin film is formed on the glass substrate 1 by sputtering. Apply powdered glass around the wiring 2 and the aluminum stripe electrode 3 by a printing method, etc.
An insulating layer 4 formed by firing, a phosphor layer 5 formed by coating and firing the aluminum stripe electrode 3 by a printing method, and a plurality of phosphor layers stretched at intervals on the phosphor layer 5. filament 6, phosphor layer 5 and filament 6
a grid 7 disposed between the glass substrate 1 and the cover glass 12 having an arcuate partially thick glass wall portion 13 at the corner portion sealed to the glass substrate 1; and an aluminum stripe electrode 3, respectively. It is composed of an anode lead wire 10, a filament lead wire, and a grid lead wire, which are connected to the filament 6 and the grid 7, pass through the sealing part 11, and are drawn out to the outside.

[0010] Since the arc-shaped thick wall portions 13 at the corner portions of the cover glass 12 are processed at the same time as the molding, the pressure resistance of the cover glass 12 is improved and the panel size is 1.5 mm. It is now possible to use the cover glass 12 with the same thickness even if the thickness is doubled, and the product thickness and weight can be reduced.

FIG. 2 is a cross-sectional view of a second embodiment of the invention.

In the second embodiment, as shown in FIG. 2, a cover glass 12 having a linear thick wall portion 14 at a corner thereof is formed by thermoforming. As a result, as in the first embodiment shown in FIG. 1, the pressure resistance of the cover glass was improved, and the product thickness and weight could be reduced.

[0013]

[Effects of the Invention] As explained above, the present invention uses a cover glass which heat-forms a single glass plate and at the same time provides thick glass wall portions at the corner portions to improve pressure resistance. This has the effect of making it possible to reduce the thickness and weight of the fluorescent display tube as the panel size increases, which was not possible with cover glasses manufactured using conventional manufacturing methods.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a first embodiment of the invention.

FIG. 2 is a sectional view of a second embodiment of the invention.

FIG. 3 is a sectional view of an example of a conventional fluorescent display tube.

[Explanation of symbols]

1 Glass substrate 2 Aluminum wiring 3 Aluminum stripe electrode 4 Insulating layer 5 Phosphor layer 6 Filament 7 Grid 8 Display glass 9 Spacer glass 10 Anode lead wire 11 Sealing part 12 Cover glass 13, 14 Thick part

Claims (1)

[Claims] 1. A translucent anode substrate, a display pattern formed on the anode substrate, a filament stretched across the display pattern at intervals, and disposed between the filament and the display pattern. In the fluorescent display tube, the display surface glass is sealed to the anode substrate via a spacer glass to form a cover glass, and the display pattern is observed from the anode substrate side. It is integrally formed from a single glass plate, and
A fluorescent display tube characterized by having thick sections at the corners.