KR930005788Y1 - Structure of stem and base for braun tube - Google Patents

Abstract

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Description

CRT stem and base structure

1 is a front view showing the configuration of a typical CRT.

2a and b are a front view and a bottom view showing an example of a conventional CRT stem structure.

3a and b are front and bottom views showing another example of a conventional CRT stem structure.

Figures 4b to c shows the tube and stem structure of the present invention, a is a front view showing the configuration of the stem, b is a bottom view showing the configuration of the stem, c is a bottom view showing the configuration of the base.

Figure 5 is a cross-sectional view taken along line A-A of Figure 4c showing the coupling state of the stem and the base structure of the present invention CRT.

* Explanation of symbols for main parts of the drawings

11: CRT 12: High voltage supply pin

13: connection pin 15, 15 ': protrusion

20: base 21: coupling groove

22: boss 24: indent

26: insulator

The present invention relates to a stem and a base structure of the CRT, in particular, a high voltage supply pin fixed to the bottom of the CRT and a protruding portion between the adjacent connection pins, the circumference of the boss on the base to which the high voltage supply pin of the CRT is fitted The present invention relates to a stem and a base structure of a CRT tube which can improve the withstand voltage characteristics by forming a concave indentation to completely separate the high voltage supply pin and the connection pin and to eliminate the gap between the system part and the base.

1 is a front view of the CRT, and FIG. 2A is a front view showing an example of a stem structure of a conventional CRT, and FIG. 2B is a bottom view of the same, and as shown therein, a stem part 1 fixed to the lower side of the CRT 10 ) Is composed of a high voltage supply pin (2), a plurality of connection pins (2) and the like.

Cracks are likely to occur when the high voltage supply pin 2 and the connection pin 3 are bent at the boundary between the high voltage supply pin 2 and the connection pin 3.

Therefore, the periphery of the high voltage supply pin 2 and the connection pin 3 was supported by the annular projection 4 for the purpose of improving the strength to prevent the crack phenomenon.

In addition, since the high voltage supply pin 2 is supplied with a high voltage of 5kv or more, insulation with other connection pins 3 is very important, and therefore, the distance between the high voltage supply pins 2 and the adjacent connection pins 3 is 6 mm. Insulators 5 and 5 'were formed on both sides of the annular projection 4 of the high voltage supply pin 2 to prevent the creeping discharge due to contamination.

However, in such a stem structure, since the high voltage supply pin 2 and the insulators 5 and 5 'on both sides thereof are adjacent to each other, there is a problem in that a discharge route is formed in the insulators 5 and 5'. When 1) is assembled to a base (not shown), the thickness of the insulators 5 and 5 'is maintained between the contact surface of the stem 1 and the contact surface of the base so that the dust is contaminated. Due to this there was a problem that the electrical leakage occurs.

Another example of a conventional stem structure for solving the above problems is as follows.

As shown in FIG. 3, the protrusions 6 and 7 are separated to completely separate the high voltage supply pin 2 from the other connection pins 3 and adjacent to the high voltage supply pin 2. In which the insulators 8 and 8 'are formed, such a stem 1' is provided between the high voltage supply pin 2 and the connecting pin 3 by completely separating the protrusions 6 and 7. The creepage distance is increased to increase the breakdown voltage. However, when the stem portion 1 'is assembled to the base, the contact surface of the base is flat while the stem portion 1' is supplied with a high voltage as shown in FIG. Since the indentations 9 and 9 'are formed around the pin 2, the stem 1 and the base do not come into close contact with each other. Therefore, a small gap is formed between the contact surfaces, and contaminated by dust or the like. There was a problem that can not be excluded due to electrical leakage.

Therefore, the present invention has been devised to solve the conventional problems as described above, fixing the high voltage supply pin and the connecting pin on the bottom of the CRT, and forming a projection between the high voltage supply pin and the adjacent connecting pin, A recess is formed around the boss of the base into which the high voltage supply pin is inserted, and an insulator is filled in the recess to join the stem portion of the CRT so that the high voltage supply pin and the connecting pin are completely separated and the gap between the stem portion and the base is eliminated. It is configured to improve the withstand voltage characteristics, which will be described with reference to the accompanying drawings.

Figure 4a is a front view showing the stem structure of the present invention tube, Figure 4b is a bottom view, Figure 5 is an enlarged cross-sectional view of the coupling state of the stem and the base according to the present invention, 11 is a view of the tube, 12 is A high voltage supply pin is shown, 13 is a plurality of connection pins, 20 is a base.

Protrusions 15 and 15 'are respectively formed between the high voltage supply pin 2 and the adjacent connection pin 13, and the bottom surface 21 of the base 20 has a coupling groove 21 formed therein. A boss 23 having a pin hole 22 into which the high voltage supply pin 12 is inserted is formed at one side of the coupling groove 21, and a fan-shaped recess 24 is formed around the boss 23. ) Is formed, and a plurality of pin holes 25 are formed adjacent to the high voltage supply pin 12.

The structure of the stem and the base according to the present invention configured as described above is first filled with the insulator 26 in the recessed portion 24 of the base 20, and then into the pin holes 22 and 25 of the base 20. The assembly is completed by inserting the high voltage supply pin 12 and the connection pin 13 of the CRT 11.

In this state, the high voltage supply pin 12 is inserted into the pin hole 22 formed in the boss 23 of the base 20 so that the boss 23 surrounds the high voltage supply pin 12 and the cathode tube ( The insulator 26 is filled in the space between the protrusions 15 and 15 'of the 11 and the recess 24 of the base 20, and the protrusions 15 and 15 on both sides of the high voltage supply pin 12. Are respectively positioned and surround the high voltage supply pins 12 as both side walls 24a and 24a 'formed by the recesses 24 of the base 20.

Therefore, as described above, the high-voltage supply pin 12 is surrounded by a stack of quadruple, and thus the withstand voltage characteristic is further improved.

In addition, the bottom surface 11a of the CRT 11 contacts the locking step 21a formed in the coupling groove 21 of the base 20, thereby eliminating the gap between the base 20 and the CRT 11.

In this way, the high voltage supply pin 12 and the other connecting pin 13 is completely blocked and at the same time completely eliminates the gap between the stem portion and the base 20 to prevent electrical leakage due to contamination of dust, etc. It works.

Claims (1)

When the base is coupled to the stem of the CRT, projections 15 and 15 'are respectively formed between the high voltage supply pin 12 fixed to the bottom of the CRT and the connecting pin 13 adjacent thereto. The concave portion 24 is formed around the boss 23 formed at one side of the coupling groove 21 of the base 20 to which the high voltage supply pin 12 is fitted, and the protrusion 15 of the CRT 11 is formed. A stem and a base structure of a CRT tube, characterized in that the insulator 26 is filled in the space between the cavities 15 'and the recesses 24 of the base 20.