JP3057909B2 - Display tube manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a display tube manufacturing apparatus and, more particularly, to a display tube for sealing an exhaust hole of an airtight envelope such as a fluorescent display tube or a plasma display with a lid member through low-melting glass. It relates to a manufacturing device.

[0002]

2. Description of the Related Art As shown in FIG. 3, a conventional manufacturing apparatus uses an O-ring 5 to surround an exhaust hole 3 formed in a substrate 2 before exhausting the inside of an envelope of a display tube 1. A mechanism for bringing the envelope into a vacuum atmosphere or a specific gas atmosphere, a mechanism for heating the display tube 1 by using the heater 11, and a method for vertically moving the exhaust system structure. The movable heater tower 9 is provided with a heater 21 for moving and melting the low melting point glass 8 on the lid member 7.

[0003]

In such a conventional display tube manufacturing apparatus, the low melting point glass 8 on the surface of the vertically moving lid member 7 provided in the exhaust system is softened by the heater 21. When the glass is melted, part of the components of the low melting point glass 8 evaporates and adheres to the electrodes and the like inside the display tube which are in close contact with the exhaust system structure, causing problems such as uneven brightness and reduced brightness. there were.

An object of the present invention is to provide a display tube manufacturing apparatus capable of obtaining a display tube free from defects such as uneven brightness and reduced brightness.

[0005]

According to the present invention, a display surface glass and an anode substrate glass on which a display pattern is formed are sealed with a low melting point glass to a predetermined position of a glass hermetic envelope formed. In a display tube manufacturing apparatus, an outlet is provided, an outer exhaust port is sealed with a lid member through low-melting glass, and the inside of the envelope is formed in one of a vacuum atmosphere and a specific gas atmosphere. A mechanism for closely contacting the periphery of the exhaust port with a vacuum exhaust device using an O-ring, and forming the inside of the envelope in one of the vacuum atmosphere and the specific gas atmosphere; the and a mechanism for heating from the outside, before
The evacuation device uses a lid member to which low-melting glass is temporarily fixed.
The low melting point gas is placed on the exhaust
A vertical movement mechanism having a heater for heating the lath;
A plurality of auxiliary exhaust side passages are provided on the outer periphery of the airway,
The auxiliary exhaust side passage is a low melting point glass temporarily fixed on the lid member.
The opening provided in the exhaust passage wall at the position corresponding to the
And is connected to the exhaust passage via

[0006]

Next, an embodiment of the present invention will be described with reference to the drawings, taking a fluorescent display tube as an example.

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

In the first embodiment, as shown in FIG. 1, a fluorescent display tube (hereinafter referred to as a display tube) 1 incorporates various electrodes, filaments and the like (not shown) and a substrate 2 The exhaust hole 3 is provided at a predetermined position. The internal gas and the gas generated during filament decomposition are exhausted through the exhaust hole 3 and the exhaust path 4. The display tube 1 and the vacuum evacuation device 20 are connected to each other by the O-ring 5 in close contact with each other, and the display tube 1 is kept airtight. As the vacuum pump 6, a rotary pump, an oil diffusion pump, an ion pump, or the like is used as necessary. A low-melting glass 8 is applied to the surface of the lid member 7 in advance and temporarily fixed. The lid member 7 is placed on the upper part of the movable heater tower 9, and the exhaust hole 3 of the display tube 1 can be sealed with the lid member 7 by melting the low melting glass 8 and pushing it upward.
A plurality of openings are formed in the wall of the exhaust passage 4 corresponding to the stop position of the lid member 7, and an auxiliary exhaust side passage 10 is provided in connection with the openings.

First, the display tube 1 and the vacuum exhaust device 20 are brought into close contact with the O-ring 5 and suctioned by the vacuum pump 6 to cause the vacuum exhaust device 20 to adsorb around the exhaust hole 3 of the display tube 1.

Next, the heater 1 of the furnace 12 for the display tube 1
In step 1, the display tube 1 is heated, and gas components absorbed in the display tube 1 and decomposition gas generated by energizing the filament are exhausted through an exhaust path 4. At this time, 42% Ni-6% Cr-
P which is applied and temporarily fixed to the lid member 7 made of residual Fe alloy
The bO—B ₂ O ₃ -based low-melting glass 8 is heated and melted by the heater 21. Exhaust corresponding to the stop position of the lid member 7
A plurality of openings are drilled in the wall of the road 4 and connected to the openings.
And the auxiliary exhaust side passage 10 is provided,
Most of the evaporative gas generated when the lower melting glass 8 is melted
The minute is immediately exhausted from the auxiliary exhaust side road 10. Remaining
The evaporative gas is exhausted from the exhaust path 4. Exhaust of this evaporated gas
After the air is over, the lid member 7 is moved by the movable heater tower 9.
The evacuation hole 3 of the raised display tube 1 is sealed to obtain a vacuum display tube.
Can be

FIG. 2 is a schematic configuration diagram showing a reference example of the present invention.

In this reference example, as shown in FIG. 2, a plurality of openings in the wall of the exhaust passage 4 of the first embodiment shown in FIG. The shutter 13 is disposed between the shutter 13 and the exhaust hole 3.

First, the display tube 1 and the exhaust device 20 are brought into close contact with each other by the O-ring 5 to be sucked.

Next, the display tube 1 is heated by the heater 11 of the furnace 12.
Is heated, and the gas in the display tube 1 and the decomposition gas due to the energization of the filament are exhausted by the vacuum pump 6 via the exhaust path 4.

On the other hand, the lid member 7 on the movable heater tower 9 is heated by the heater 21 to melt the low melting point glass 8. When the movable heater tower 9 rises, a shutter 13 having an opening / closing mechanism provided between the cover member 7 at the opening of the auxiliary exhaust side passage 10 and the exhaust hole 3 of the display tube 1 opens, and the movable heater tower 9 is opened. Reference numeral 9 further rises, and the lid member 7 is closely attached and sealed to the exhaust hole 3 of the display tube 1 to obtain a display tube.

[0016]

As described above, according to the present invention, the component gas generated when melting the low-melting glass on the lid member for sealing the display tube is supplied to the auxiliary exhaust side located near the low-melting glass. By suctioning and exhausting from the road, it is possible to prevent evaporation and adsorption into the display tube and to provide a display tube with high display quality without luminance unevenness or reduction in luminance.

Further, by providing an open / close shutter between the lid member and the exhaust hole, the effect can be further enhanced.

[Brief description of the drawings]

FIG. 1 is a schematic configuration diagram of a first embodiment of the present invention.

FIG. 2 is a schematic configuration diagram showing a reference example of the present invention.

FIG. 3 is a schematic configuration diagram of an example of a conventional display tube manufacturing apparatus.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Display tube 2 Substrate 3 Exhaust hole 4 Exhaust path 5 0 Ring 6 Vacuum pump 7 Lid member 8 Low melting glass 9 Movable heater tower 10 Auxiliary exhaust side path 11 Heater 12 Furnace 13 Shutter 20 Vacuum exhaust device 21 Heater

Claims (1)

(57) [Claims] An exhaust hole is provided at a predetermined position of a glass airtight envelope formed by sealing a display surface glass and an anode substrate glass having a display pattern formed thereon with a low melting point glass. In a display tube manufacturing apparatus in which a hole is sealed with a lid member through low-melting glass and the inside of the envelope is formed in one of a vacuum atmosphere and a specific gas atmosphere, the periphery of the exhaust hole is Is brought into close contact with the evacuation device using a O-ring,
A mechanism for forming the inside of the envelope in one of the vacuum atmosphere and the specific gas atmosphere, and a mechanism for heating the envelope from the outside, wherein the vacuum exhaust device has a low melting point glass. A vertical moving mechanism including a heater for heating the low melting point glass while placing the lid member to which the temporarily fixed lid is mounted and moving the inside of the exhaust passage up and down, and a plurality of auxiliary exhaust side passages on an outer peripheral portion of the exhaust passage. The auxiliary exhaust side passage is connected to the exhaust passage through an opening provided in an exhaust passage wall at a position corresponding to a stop position of the low melting point glass temporarily fixed on the lid member. Display tube manufacturing equipment.