KR910003377Y1 - Cathode assembling absorption apparatus for the neagtive pole tube - Google Patents

Abstract

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Description

Cathode assembly for cathode cable

1 is a cross-sectional view showing a state in which a cathode is inserted into a cathode ray tube electron gun by an assembling suction hole;

2 is a cross-sectional view showing a state in which the cathode is adsorbed in the conventional adsorption port.

3 is a partial cross-sectional view showing a state in which the cathode is adsorbed to the adsorption port according to the present invention.

4 is an enlarged view of a portion A in FIG.

* Explanation of symbols for main parts of the drawings

10: electron gun 11: cathode support

20: cathode 21: sleeve support tube

22: sleeve 23: base metal

24: tape 30a, 30b: suction hole

31a: space part 32a, 32b: air suction passage

33a: adsorption end 33b: small diameter end

33c: stepped large diameter end

The present invention relates to a nozzle-type adsorption port for finally inserting and welding a cathode, which is an electron radiation source, to a cathode ray tube electron gun that forms a structure by a bead glass. The present invention relates to an improvement to firmly hold a fixed position of a sleeve.

The cathode for cathode ray tube is inserted and welded to the cathode support 11 positioned opposite the G1 electrode after the electrodes of the electron gun are configured as an assembly by the bead glass BG as shown in FIG. The heater is subsequently inserted and fixed. At this time, the cathode 20 is adsorbed and held by the air suction suction port 30a, which is shown in FIG. 2 of the sleeve support tube 21 of the cathode 20. As shown in FIG. The suction end 33a is fitted to the inner circumferential surface so as to be connected to a vacuum pump so that low pressure is induced in the opening of the suction end so that the cathode 20 can be temporarily gripped. In addition, as an electrode of the resistance welder, the cathode support 11 and the support tube 21, the cathode support 11 and the support tube 21 to be easily welded to support. This conventional suction port is provided with a space for allowing the sleeve 22 supported by the metallic tapes 24 and 24 to the sleeve support tube 21 to be positioned within a predetermined depth. 31a) is provided at the opening end of the air suction passage 32a so that the sleeve 22 located in the space in the sleeve support tube 21 is not interfered with and shifted in position. However, when air is sucked in through the suction port space 31a and the air suction passage 32a, a low pressure is generated enough to adsorb the sleeve because it passes through the gap formed around the sleeve without great resistance. it's difficult. In fact, this problem in the production line, because the sleeves adsorbed in the adsorption port often falls out during the insertion process, the defect rate of the product was remarkable.

On the other hand, apart from the problems caused by insufficient low pressure as described above, look at the problems from the other side as follows.

The same is true for all electrodes, but the distance between the base metal 23 of the cathode and the G1 electrode, which is inserted into the cathode support opposite the G1 electrode by the adsorption hole, is a factor that can change the cathode current of the electron gun. The set value must remain firm. However, the suction hole cannot maintain this, but rather the sleeve fixed by the tape inside the sleeve support tube is forced by the air flow pressure in the space, thereby leaving the normal position. . In particular, since there is no means for supporting the sleeve in the suction port, there is a problem that the minute positional fluctuation of the sleeve generated when the cathode is fitted to the suction end by the operator's manual operation cannot be corrected.

The present invention is so firmly adsorbed so that there is no fear that the cathode is released during the operation, so that the position of the sleeve located in the support tube can be maintained very firmly and the position thereof can be precisely corrected. The purpose of the present invention is to provide an adsorption hole for cathode assembly for cathode ray tube which can maintain the performance of cathode ray tube electron gun at a predetermined level or more.

In order to achieve the above object, the present invention, in the cathode assembly device having an electron gun holder and a cathode feeder is fixed to the cathode feeder, the air suction passage is provided in the longitudinal direction of the body, It is characterized in that a small diameter end portion into which the sleeve can be fitted and a large diameter end portion into which the sleeve support tube can be fitted are formed at the adsorption end of one side end.

Hereinafter, the present invention will be described in more detail with reference to the accompanying drawings.

Referring to the cathode adsorption port 30b shown in FIGS. 3 and 4, the small diameter end portion 33b fitted to the small diameter sleeve 22 at the adsorption end portion at which the cathode 20 is gripped is A stepped large diameter end portion 33c is formed to have a predetermined length and is subsequently fitted to the sleeve support tube 21 supporting the sleeve 22. At this time, the diameters are such that they can slide freely without great friction with respect to the sleeve or the support tube, respectively.

Looking at the state in which the cathode is adsorbed in the present invention configured as described above, as shown in the enlarged view of FIG. 4, the sleeve 22 and the support tube 21 are firmly supported by the respective ends 33b and 33c. The sleeve 22 is very strongly adsorbed due to the suction of air through the air suction passage 32b. That is, according to the present invention, unlike the conventional one, the suction target is changed into a sleeve, and the sleeve 22 is firmly supported by the small diameter end 33b, and the support tube 21 supporting the suction tube is not dependent on the suction force. It is simply indirectly fitted to the large diameter end portion 33c by the sleeve 22. In this way, the relative position of the sleeve with respect to the G1 electrode of the electron gun can be maintained firmly. In addition, even if the position of the sleeve with respect to the support tube is slightly biased, the small diameter end portion is sucked and gripped, so that it is uniformly corrected according to the specifications of the large diameter end portion and the small diameter end portion.

As such, the present invention is capable of absorbing and holding the cathode very firmly, correcting the relative position of the sleeve with respect to the support tube, and correcting the relative position of the sleeve with respect to the support tube. It does not cause problems like In other words, even if the product is deteriorated due to the detachment of the cathode during the joining operation, even if the cathode is securely attached to the support without being released, the gap between the sleeve cathodes due to the position change of the sleeve due to the air suction pressure Do not cause fluctuations in the position of the sleeve. As a result, the cathode fixation state of each electron gun is very even, so that the cathode-G1 electrode gap between all products is minimized, thereby facilitating subsequent work in the performance tuning process. Directly above a certain level of performance can be expected for all products.

Claims (1)

It is connected to a vacuum generator and used to insert the cathode 20 by vacuum adsorption and insert it into the cathode support 11 of the electron gun. A cathode end tube cathode adsorption assembly, characterized in that the diameter end portion 33b and the large diameter end portion 33c into which the support tube 21 for supporting the sleeve 22 is fitted are formed at the front end portion of the body. .