KR910004353Y1 - Noise protection structure of cathode ray tube - Google Patents

Abstract

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Description

Noise prevention structure of cathode ray tube

1 is a schematic cross-sectional view of a common color cathode ray tube.

2 is a side view of a stem part.

3 is a front view of the stem according to the present invention.

4 is a front view of a conventional stem.

* Explanation of symbols for main parts of the drawings

G3: Acceleration grid supply pin 4,12: Ball pin

5: G ₁ pin 8: Red cathode supply pin

11: blue cathode supply pin 15,16: connecting wire

The present invention is to prevent the noise phenomenon generated in the cathode ray tube, in particular, to provide a structure that can fundamentally prevent the noise (noise) on the screen caused by the leakage of the current of the branch supplied to the electron gun mutually. I will.

Stem-pin is embedded at the end of the cathode ray tube and the neck part, and serves as a terminal for transmitting power supplied from the outside to the electron gun inside.

The stem pins are buried at regular intervals of about a dozen, but in the case of the G ₃ pin (accelerating grid), a high voltage of 5 to 7 kV is applied, so that there is a little more space on both sides. The ball pin is embedded.

Conventionally, such a pin structure is standardized, so that the connection with the socket is properly made. However, if the distance between both sides of the G ₃ pin is further arbitrarily considered in consideration of the influence of the high voltage, problems due to the design change may be variously accompanied. putting the gongpin does not use the pin adjacent to the both sides of G ₃ pins.

However, the above ball pins have the following problems.

That is, as shown in FIG. 4, when the high voltage applied to the G ₃ pin leaks, it is conducted to the surrounding empty pin and flows to the R cathode pin and the B cathode pin. There was a defect that caused.

The present inventors have found that the product of the above phenomenon deteriorates, and the present invention has been created for the purpose of resolving it, and it will be apparent from the following description of the preferred embodiments of the present invention.

FIG. 1 is a schematic cross-sectional view of a cathode ray tube showing a conventional panel 9, shadow mast S, corner C, neck N, electron gun E and stem M. FIG.

In the operation of the cathode ray tube, the anode voltage is supplied from the terminal installed in the corner (C), and the cathode (H) cathode G ₁ , when the cathode voltage is supplied to the stem (m) at the end of the neck (N). It is energized by G ₂ and G ₃ to emit the beam.

The present invention is to improve the pin structure of the stem (M) in the above structure, and enlarged the stem in FIG. At the edge of the stem (M) made of T-shaped glass material, a plurality of metal pins are embedded, and the arrangement and functions of the pins are represented in FIG. 3 and a high voltage of 5 to 7 kV is applied to the G ₃ pins. emitting part of the red, green and blue cathode pin 6 8 11 105 ~ 135V, the cathode internal pins connected to the heaters 9 and 10 is a 5 ~ 10kV and the shielding-side G ₁ pin ( 5) The function of applying 320 ~ 370V is given.

Also, in the pin arrangement, unused ball pins 4 and 12 are arranged on both sides of the G ₃ pin, and the connecting line 15 (for the two ball pins 4 and 12 from the G ₁ pin 5, respectively) 16).

Thus, while connecting the G ₁ pin 5 to the ball pin (4) 12, the voltage of the G ₁ pin and the ground voltage on the coin is applied to the ball pin. When the voltage of the G ₁ pin and the voltage on the coin are applied to the ball pins 4 and 12 as described above, the red, blue, and green cathode pins 6, 8, and 11 of the high potential G ₃ pin and the lowest potential are applied. Intermediate potential barriers are formed between them. This potential barrier is such that a potential barrier of intermediate potential is formed between the pin G ₃ pin and the cathode pin 6, 8, 11 of the most potential potential. The potential barrier is located between the fixed-position G ₃ pin and the lowest potential cathode pin (6) (8) (11) to reduce the relative potential difference between the pin and the high potential G ₃ pin and the cathode pin (6) ( 8) Suppress current leakage between (11).

This effect of the potential barrier is particularly effective at the beginning of the operation of the color cathode ray tube, that is, when the potential difference is shockingly induced with an extremely high potential difference in the state where the potential difference is zero, and at this time, some leakage current flows to the ground terminal through the ball pin.

Therefore, the high and low leakage current generated in the G ₃ pin easily flows due to the low voltage of the red and blue cathode pins 8 and 11 to induce the problem that the noise occurs to the ball pins 4 and 12. The present invention can be solved as a countermeasure, and the present invention has been completely eliminated that the abnormal state of the screen appeared for several tens of seconds due to leakage voltage generated momentarily during off-on of the color CRT, thereby providing viewers with a good picture quality at all times. In addition, it is a useful design such as to increase the reliability of the product.

Claims (1)

In a conventional stem portion in which a plurality of terminal pins are arranged to supply power to an electron gun E enclosed in the neck portion N of a cathode ray tube, a low potential G ₁ pin 5 and a high potential G ₃ Two ball pins 4 and 12 positioned between the electrodes are interconnected with the G ₁ pins before the leakage voltage of the G ₃ pin to which the high voltage is applied is small and flows to the blue cathode pins 8 and 11. Noise prevention structure of the cathode ray tube, characterized in that configured to be guided to the ball pin (4) (12) in the middle.