JPH05314906A - Display tube - Google Patents

Abstract

PURPOSE:To eliminate the irregularity and lowering of brightness and also prevent the imperfection of airtightness by placing a sinter body of glass in annular form on the circumferential edge of the projection part of a lid member having a conical projection part at the center and then fusing the lid member in an exhaust hole hermetically. CONSTITUTION:An annular glass sinter body 8 of PbO-B2O3 series is placed on the circumferential edge of the part 8 of a lid member 7 having a conical projection part at the center. And then the member 7 is placed on the top part of the movable type heater tower of an exhaust device, and the sinter body 8 is fused by directly heating with a heater 4. Next, when gas is adequately exhausted from a display tube 20, a tower 3 is raised and the part 6 of the member 7 is inserted into the exhaust hole 5 of the tube 20 and hermetically sealed. Then, the sinter body 8 may be easily arranged and at the same time the adhesion of evaporated glass components can be prevented, so that the irregularity and lowering of brightness due to the adhesion of glass to an electrode and the like can be eliminated. And also the sealing can be made at the center of the hole 5, so that the imperfection of airtightness can be prevented.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display tube, and more particularly to a display tube in which an exhaust hole is sealed with a lid member.

[0002]

2. Description of the Related Art In a conventional method for manufacturing a display tube, as shown in FIG. 4, first, a low melting point glass 19 is applied to the entire sealing surface of a lid member 1 and preliminarily baked and fixed. Next, the lid member 1 is placed on the upper mounting portion of the movable heater tower 3 which is vertically movable in the exhaust device of the display tube 20 shown in FIG. A heater 4 is arranged in the upper part of the movable heater tower 3, is placed on the upper part of the movable heater tower 3, and melts again the low melting point glass 19 on the lid member 1 which has been pre-calcined in advance. Next, when the gas in the display tube 20 is sufficiently exhausted, the movable heater tower 3 rises and the melted low melting point glass 19 on the lid member 1 seals the exhaust hole 5 of the display tube 20.

[0003]

In the conventional method for manufacturing a display tube as described above, when the low melting glass is softened and melted by the heater of the movable heater tower, the components of the low melting glass are evaporated, There are problems such as adhesion to electrodes inside the display tube and other problems such as uneven brightness and decreased brightness, and misalignment resulting in impaired airtightness.

An object of the present invention is to provide a display tube which does not have unevenness in brightness and deterioration in brightness and does not impair airtightness.

[0005]

The present invention comprises an anode substrate,
In a display tube having a display surface glass that is hermetically sealed to the anode substrate via a spacer glass to form an envelope, an exhaust hole provided in the anode substrate, and a lid member that seals the exhaust hole. The sealing surface of the lid member is flat, and the outer peripheral portion of the sealing surface is annularly sealed with a low melting point glass. Further, the lid member is characterized in that it has a conical projection at the center.

[0006]

Embodiments of the present invention will now be described in detail with reference to the drawings.

FIG. 1 is a sectional view illustrating a method of sealing an exhaust hole according to a first embodiment of the present invention, and FIG. 3 is a schematic configuration diagram of an exhaust device used in the embodiment of the present invention.

In the first embodiment, as shown in FIG.
42% Ni-6% C that has been pre-oxidized as the lid member 1
r- placing a glass sinter annular who mold firing PbO-B ₂ O ₃ -based low melting glass on the residual Fe alloy lid member 1, and fixing the glass 2 and calcined in an oven ..

Next, the lid member 1 is movably mounted on the upper part of the heater tower 3 which moves up and down in the exhaust device shown in FIG. 3, and depending on the heater 4 provided in the upper part of the movable heater tower 3. The fixed glass 2 is remelted.

Next, when the gas in the display tube 20 is sufficiently exhausted, the movable heater tower 3 rises to seal the exhaust hole 5 of the display tube 20 with the lid member 1.

FIG. 2 is a sectional view illustrating a method of sealing an exhaust hole according to a second embodiment of the present invention.

In the second embodiment, as shown in FIG.
The PbO—B ₂ O ₃ -based annular glass sintered body 8 used in the first embodiment is placed on the periphery of the protrusion 6 of the lid member 7 having the conical protrusion 6 in the center in advance.

Next, the lid member 7 is placed on the upper portion of the movable heater tower 3 of the exhaust system shown in FIG.
Is directly heated by the heater 4 and melted.

Next, when the gas in the display tube 20 is sufficiently exhausted, the movable heater tower 3 rises and the conical projection 6 of the lid member 7 is inserted into the exhaust hole 5 of the display tube 20. Closely seal.

[0015]

As described above, according to the present invention, the upper surface of the lid member for sealing the display tube in order to keep it airtight is fixed by annular glass and remelted to seal the lid member in the exhaust hole of the display tube. Due to the attachment, the molten glass does not directly contact or enter the exhaust hole, so that the evaporated glass component is prevented from being adsorbed in the display tube.

Further, by providing the conical protrusion in the center of the lid member, the annular glass sintered body can be easily arranged and the adsorption of the evaporated glass component can be prevented, and the center of the exhaust hole can be prevented. It has the effect of being able to seal to and preventing airtight problems.

[Brief description of drawings]

FIG. 1 is a sectional view illustrating a method of sealing an exhaust hole according to a first embodiment of the present invention.

FIG. 2 is a sectional view illustrating a method for sealing an exhaust hole according to a second embodiment of the present invention.

FIG. 3 is a schematic configuration diagram of an exhaust device used in an embodiment of the present invention.

FIG. 4 is a cross-sectional view illustrating an example of a conventional method for sealing an exhaust hole of a display tube.

[Explanation of symbols]

 1,7 Lid member 2 Fixed glass 3 Movable heater tower 4,17 Heater 5 Exhaust hole 6 Projection part 8 Annular glass sintered body 9 Display segment 10 Grid 11 Filament 12 Display surface glass 13 Anode substrate 14 Spacer glass 16 Exhaust device 18 Vacuum pump 19 Low melting glass 20 Display tube

Claims (2)

[Claims] 1. An anode substrate, a display surface glass that is hermetically sealed to the anode substrate via a spacer glass to form an envelope, an exhaust hole provided in the anode substrate, and the exhaust hole is sealed. In the display tube having a cover member, the cover member has a flat sealing surface, and an outer peripheral portion of the sealing surface is annularly sealed with a low melting point glass. 2. The display tube according to claim 1, wherein the lid member has a conical protrusion at the center.