JPS59184483A - Electric heat chip off heater and method of producing same - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Technical field of the invention] The present invention seals off glass exhaust pipes of electron tubes, light bulbs, etc.
The present invention relates to an electric tip-off heater (which performs tip-off) and a manufacturing method thereof.

[Technical background of the invention and its problems]

In general, for electron tubes such as cathode rays and light bulbs such as mercury lamps (hereinafter referred to as bulbs), the inside of the bulb is made to a predetermined vacuum via a glass exhaust pipe, and then the glass exhaust pipe is tipped off by an electric tip-off heater.

Next, an example of this step-off process will be explained with reference to FIGS. 1 and 2.

That is, the cathode ray tube (1) has a crow exhaust pipe (4) installed in the center of the stem (3) in which the stem pin (2) is installed.
), vacuum pump (6) and (
7), and the inside is made into a high vacuum. Next, current is passed through the coil-shaped electric temp-off heater (8) that has been placed around the glass exhaust pipe (4).
3) Heat the glass exhaust pipe (A) as shown in Figure 2.
Chip on.

In this case, V'cj is to reduce the gas emission during chimp-on-hatesop-off of the crow exhaust pipe (4), to prevent deterioration of the characteristics of the tube, and to reduce the electric heating of the exhaust pipe (8).
In order to reduce power consumption, it is desirable to reduce the number of turns of the coil and to place it as close to the glass exhaust pipe (4) as possible.

In order to satisfy this condition, the electric tip-off heater (8) is generally used in a tightly wound coil, but in this case, the 1/e3 edge between the layers of the coil poses a problem.

That is, a nichrome wire coated with an oxide film is usually used as the heating element of the electric heating or tip-off heater (8). However, since the temperature of the electric tip-off heater (8) itself is used at a high temperature to chimp off the glass exhaust pipe (3), it may exceed the allowable upper limit temperature of the nichrome wire, resulting in interlayer contact and peeling of the oxide coating. There are many problems such as deterioration of the heating element and breakage of the wire in a short period of time.

Instead of this nichrome wire, Fe, which has a high allowable upper limit temperature, can be used.
-All-Or alloy wires are known, but they have problems in that they are difficult to process and form into electric tip-off heaters, and they are expensive.

[Purpose of the invention]

The object of the present invention is to provide an electric temper-on heater that uses a cheap Nichrome wire coated with an oxide film as a heating element, has a long life, and is easy to be formed into a heat mold, and a method for manufacturing the same.

[Summary of the invention]

The present invention relates to an electric temp-off heater characterized in that a heating element made of a nichrome wire coated with an oxide film and then a μ lath material-film is formed into a nearly tightly coiled coil, and this electric tip-off heater. This is a manufacturing method.

[Embodiments of the invention]

Next, one embodiment of the electric tip-off heater of the present invention will be explained with reference to FIGS. 3 and 4.

That is, the electric chip-off heater A8 is made of a heating element which is coated with an oxide film 02 and a glassy material film θ on the chromium SU oxide film, which is almost tightly wound into a coil shape. It is characterized by what is being done.

Next, a method of manufacturing this electric chip-off heater will be explained.

In other words, a nichrome wire coated with an oxide film is formed into a coarsely pitched coil with a wide gap between layers, and then a current is passed in nitrogen gas to maintain the temperature at a high temperature to sufficiently release the impurity gases contained in the nichrome wire. Let's do it. Next, while keeping the temperature high, I K2 S
An aqueous solution of an inorganic adhesive such as i03, Na2Sio3, or frit glass is applied, held for a while, and then reshaped into a tightly wound coil.
By stopping the current supply, a highly heat-resistant and highly insulating electric tip-off heater with an oxide coating and a glass-like insulating material deposited on the nichrome wire is completed.

The lifespan of the electric tip-off heater obtained in this way is extremely long compared to electric tip-off heaters coated only with an oxide film, and has a lifespan of more than one year when actually used within the heater operating temperature range. .

〔Effect of the invention〕

As described above, according to the present invention, it is possible to provide an electric Y-tube-off heater that prevents disconnection of the nichrome wire, has a long life, 5X, and is easy to manufacture, and its industrial cost is extremely high. It is also

[Brief explanation of the drawing]

Figures 1 and 2 are diagrams showing the exhaust and tip-off periods of a cathode ray tube. Figure 1 is a commercial illustration, and Figure 2 is the relationship between the glass exhaust pipe and electric tip-off heater during tip-off. FIGS. 3 and 4 are diagrams showing the electric temp-off heater of the present invention, FIG. 3 is a sectional view of the main parts, and FIG. 4 is an enlarged view of the main parts of FIG. 3. FIG. 1... Cathode ray tube 4... Glass exhaust pipe 8.18
...Electric chip-off heater 11...Nichrome wire 12...Oxide film 13...Glass-like substance film Agent Patent attorney Inoue - MaleFigure 1Figure 3Figure 2

Claims (2)

[Claims] (1) An electric tip-off heater characterized in that a heating element coated in this order with a nichrome wire VC oxide film and a glassy substance film is formed into a substantially tightly wound coil shape. (2) A step of forming a heating element in which a nichrome wire is coated with J oxide into a coiled VC with coarse pitch winding, a step of maintaining the heating element at a high temperature and letting out gas, and a step of keeping the heating element at a high temperature. 28i03°Na while maintaining
, a step of coating a glassy material film by applying an aqueous solution of an inorganic adhesive such as SiOs or a frit glass, and a step of forming the coarse pitch winding into a substantially tight winding. A method of manufacturing an electric chimp-off heater.