JPH0272539A - Cathode ray tube envelope firing equipment - Google Patents

Abstract

PURPOSE:To make a neck section free from a thermal strain due to heating by installing a heater at the tip of a hot air injection nozzle or near there. CONSTITUTION:A heater 9 is installed at the tip of a hot air injection nozzle 8 inserted into a peripheral equipment 3 from an opening of a neck section 4 or near there, air sent from an air blower 10 is heated by this heater 9, and becomes hot air at a temperature of 460 deg.C or more, which is jetted into the tube inside of the peripheral equipment 3. An air which passes through the hot air injection nozzle 8 before it passes through the heater 9 becomes, therefore, still a low temperature, so that the neck section 4 does not receive heat radiation from the injection nozzle 8. Thereby, it is possible to prevent a thermal strain at the neck section due to heating.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a cathode ray tube envelope firing device, and particularly to a hot air injection device.

[Conventional technology]

For example, the manufacturing method for color cathode ray tubes generally involves first depositing a fluorescent film, a filming film, a metal back layer (aluminum vapor deposited film), etc. on the circular surface of the panel, and then applying a conductive layer, etc. on this and the inner surface. When a frit baking process is performed in which the N-coated funnel is welded by heating and baking the two through a bonding material (such as a 7-lit glass composition), polyvinyl alcohol containing a phosphor layer or a filming film is formed. A panel baking process is performed to heat and decompose organic substances forming the panel, followed by sealing, evacuation, and aging processes to complete the panel.

The above frit baking process and panel baking process are not performed separately, but are baked simultaneously in the same heating furnace in order to reduce thermal energy consumption, shorten process time, and improve productivity. Baking methods have been proposed.

Figure 2 shows a baking device used in such a baking method, especially a hot air injection device, where 1 is a hot air generator, 2 is a hot air generator, and 2 is a hot air generator.
The cathode ray tube envelope 3 is placed in a heating furnace (not shown).
This is a hot air injection nozzle that is inserted through the opening η) of the neck portion 4 of.

Here, the hot air heated by the hot air generator 1 is injected from the nozzle 2η) into the envelope tube, and then the panel 5 and the funnel 6 are bonded via the bonding material 7 (frit baking). At the same time, the panel 5 is heated and baked (panel baking).

[Problem to be solved by the invention]

In the above-mentioned conventional device, the hot air injected from the injection nozzle 2) is usually at a temperature of 460°C or higher,
The temperature of the hot air sent from the hot air generator 1) is even higher in consideration of heat loss until it is injected, so the tube wall of the nozzle 2 is heated to a high level of η). ,
The neck portion 4 is heated by the heat radiation, and there is a fear that thermal distortion may occur and cracks may occur.

SUMMARY OF THE INVENTION In view of the above-mentioned conventional problems, an object of the present invention is to provide a hot air injection device in which the neck is not heated and cracks do not occur.

[Means to solve the problem]

The above purpose is to heat the envelope of a cathode ray tube in a heating furnace, which is a combination of a panel with a phosphor layer etc. deposited on the inside surface and a funnel with a conductive layer etc. deposited on the inside surface. , is achieved by providing a heater at or near the tip of the nozzle in a cathode ray tube envelope firing apparatus in which a hot air injection nozzle is inserted into the envelope and hot air is blown into the envelope to fire the envelope. .

[Effect]

By the above means, the injection nozzle in the vicinity of the neck portion is not heated to a high temperature, so that the neck portion is hardly heated by thermal radiation. Therefore, there is no risk of thermal distortion due to heating of the neck portion.

〔Example〕

An embodiment according to the present invention will be described below with reference to FIG.

In FIG. 1, reference numeral 8 denotes a hot air injection nozzle inserted into the envelope 3 through the opening of the neck portion 4. A heater 9 is provided at or near the tip of the hot air injection nozzle, and the air sent from the blower 10 is sent to the heater 9. heated at 460° from nozzle 8711
or higher, and is blown out into the tube of the envelope 3.

With this configuration, the air passing through the injection nozzle 8 before passing through the heater 9 is still at a low temperature, so the neck portion 4 does not receive heat radiation from the injection nozzle 8, so there is no risk of thermal distortion occurring. .

In addition, as shown in FIG.
2 and controlling the current of the power source 13 of the heater 9 using the output signal of the control device 12, it is also possible to appropriately adjust and set the temperature of the hot air to be injected.

[Effects of the Invention]' According to the present invention described above, in the baking process for firing the envelope of a cathode ray tube, the neck portion is heated by the hot air jet nozzle inserted into the envelope, and cracks are generated due to thermal distortion. No inconvenient problems arise.

Further, since the hot air is generated by a heater provided at or near the tip of the injection nozzle, even if hot air is generated at a higher temperature than before, there is no problem of heating the neck portion.

Therefore, it is possible to perform firing at a higher temperature than before, so firing can be performed more reliably and the firing time can be reduced by 1.
It can be shortened by about 0 to 2O4. As a result, there are effects such as reduction in thermal energy and improvement in productivity.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a main part showing an embodiment of a hot air injection device according to the present invention, and FIG. 2 is a sectional view of a main part of a conventional hot air injection device. DESCRIPTION OF SYMBOLS 1... Hot air generator, 2... Hot air injection nozzle, 3... Envelope, 4... Neck part, 5
... Panel, 6... Funnel, 7... Bonding material, 8... Hot air injection nozzle, 9...
Heater, 10... Air blower, 11... Temperature sensor +? -12... Temperature control device, 13... Power supply. 8: 8 Hikaru (mouth shot J Suru 9: Katana 0 Zenhehi 7 0-Passing device: Ta ILA Sensu- 2: A control lambda wholesaler 3: Bushori

Claims (1)

[Claims] 1. A cathode ray tube envelope consisting of a combination of a panel having a phosphor layer etc. deposited on its inner surface and a funnel having a conductive layer etc. deposited on its inner surface is heated in a heating furnace. In a cathode ray tube envelope firing apparatus that heats the envelope and fires the envelope by inserting a hot air injection nozzle into the envelope and blowing hot air into the envelope, a heater may be provided at or near the tip of the nozzle. Features: Cathode ray tube envelope firing equipment. 2. Claims characterized in that a temperature sensor is provided in the front part of the heater, and the output of the temperature sensor is used to operate a temperature control device to control the hot air injected from the injection nozzle to a predetermined temperature. The cathode ray tube envelope firing device according to item 1.