JP3056027B2 - Fluorescent display tube - Google Patents

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 cover glass structure.

[0002]

2. Description of the Related Art As shown in FIG. 4A, a conventional fluorescent display tube emits thermoelectrons emitted from a filament 3 in a container which is vacuum-sealed with a cover glass 1 and a glass substrate 2.
Acceleration is caused by the grid 4 to which a direct current or pulse voltage is applied, and the phosphor 5 applied to the glass substrate 2 in a pattern shape to be displayed on the glass substrate 2 is caused to emit light.

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

[0005] On the other hand, a back surface light emitting device is provided in which a wiring pattern 11 of a display pattern covered with a phosphor 5 shown in FIG. As shown in FIG. 5 (a), the cover glass used in the mold type fluorescent display tube was such that the front glass 9 and the side glass 8 were integrally formed, and the inner wall surface was flat.

[0005]

As described above, in the conventional cover glass for a fluorescent display tube, when a glass substrate and a vacuum container are formed, the container needs to have strength to withstand atmospheric pressure. If the thickness of the cover glass is increased in order to increase the strength of the vacuum container, there is a problem that the vacuum container becomes heavy and the space factor is deteriorated. For example, when the side glass is thickened, there is a problem that the display pattern area is reduced due to the limitation of the contact terminal space, which is the contact portion between the grid and the anode and the external lead, which are present.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a fluorescent display tube which can increase the pressure resistance of the display tube without increasing the thickness of the cover glass and which does not reduce the area where the display pattern can be formed. It is in.

[0007]

SUMMARY OF THE INVENTION The present invention provides a side glass and
Cover formed by fixing the windshield with seal glass material
ー In a container that is vacuum-sealed with glass and a glass substrate,
Thermions emitted from the filament into direct current or pulsed
The pattern to be displayed on the anode accelerated by voltage
The phosphor applied in the shape of the
In a fluorescent display tube for displaying a pattern, the cover cover
At least a part of the windshield and the side
Fixed to a part of the lath and the height is lower than the height of the side glass
A rib is provided. In addition, the present invention
ー In a container that is vacuum-sealed with glass and a glass substrate,
Thermions emitted from the filament into direct current or pulsed
The pattern to be displayed on the anode accelerated by voltage
The phosphor applied in the shape of the
In a fluorescent display tube for displaying a pattern, the cover cover
The lath heats and softens the glass sheet and has the desired external shape
The side glass part and Freon
Cover glass with a glass part integrally molded
When crossing the front wall of the windshield at the center,
Simultaneously form ribs below the height of the side glass along the corner line
It is characterized by being an integrally molded cover glass
You.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described with reference to the drawings. FIG. 1 is a perspective view of a cover glass and a sectional view of a fluorescent display tube according to an embodiment of the present invention. As shown in FIG. 1, in a container vacuum-sealed with a cover glass 1 and a glass substrate 2, a filament 3 for emitting thermoelectrons and a grid 4 for accelerating and controlling the emitted thermoelectrons are provided. Then, the wiring layer 11 and the phosphor 5 are formed.

Further, the cover glass 1 has a side glass 8 and a windshield 9 fixedly formed with a seal glass 10, and ribs 12 are provided on the inner wall of the windshield 6 with glass. FIG. 2 is a perspective view of a cover glass of a second embodiment 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 a cover glass according to a third embodiment and a sectional view of a fluorescent display tube. The cover glass shown in this figure has a side glass 8 and a windshield 9 integrally formed, and intersects the inner wall surface of the windshield 9 at the center.
The ribs 12 are formed integrally with the cover glass 1 along a diagonal line so as to form the ribs.

In the cover glass 1 having the ribs 12 shown in FIG. 1, 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 the desired light is transmitted from behind. Since it is used for a bottom emission type fluorescent display tube for displaying this pattern, there is no effect on the displayed pattern.

[0012]

As described above, according to the present invention, by providing ribs on the inner wall of a cover glass used for a 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 large display with thin glass.

[Brief description of the 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 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 therein, and a sectional view of FIG.

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

[Description of Signs] 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 section 12 Rib

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) H01J 31/15 H01J 29/86 H01J 29/87

Claims (2)

(57) [Claims] 1. A thermoelectron emitted from a filament is accelerated by a direct current or a pulse voltage in a container which is vacuum-sealed with a cover glass and a glass substrate.
In a fluorescent display tube that displays a desired pattern by colliding with the phosphor applied in the shape of the pattern to be displayed above, the side glass and the front glass are sealed glass materials.
Less on the inner wall of the cover glass formed
Also adhered to part of the windshield and part of the side glass
A fluorescent display tube provided with ribs whose height is lower than the height of the side glass . 2. A vacuum seal with a cover glass and a glass substrate.
Electrons emitted from the filament in a sealed container
Is accelerated by direct current or pulse voltage, and anode (anode)
Impact on the phosphor applied in the shape of the pattern to be displayed above
A fluorescent display tube that displays a desired pattern by emitting sudden light
In the above, the cover glass is heated and softened the sheet glass and filled in a mold having a desired outer shape.
Cover with integrally molded side glass and windshield
It is glass and has a medium
The height of the side glass along the diagonal so as to intersect at the center
Integrally formed cover glass with lower ribs formed simultaneously
A fluorescent display tube , characterized in that: