KR970005073Y1 - Cathode - ray tube of shield case - Google Patents

Abstract

None.

Description

Cathode ray shield case

1 is an exploded perspective view schematically showing a shield case of a cathode ray tube to which a conventional circuit board is mounted.

2 is an assembled cross-sectional view of the shield case of the cathode ray tube shown in FIG.

3 is an exploded perspective view schematically showing a shield case of a cathode ray tube according to the present invention

4 is an assembly view showing a shield case of a cathode ray tube according to the present invention

5 is a cross-sectional view showing a shield case of a cathode ray tube according to the present invention

6 is a cross-sectional view taken along the line VI-VI of the shield case shown in FIG.

FIG. 7 is an exploded perspective view showing enlarged "B" of the shield case shown in FIG.

8 (a) is a plan view showing a shield case of a cathode ray tube according to the present invention

(b) is an exploded perspective view in which the main part of (a) is enlarged.

* Explanation of symbols for main parts of the drawings

10: cathode ray tube (CRT) 11: neck portion

12: deflection yoke 13, 30: circuit board

13a: fastening hole 14: adhesive member

20, 40: shield case 21: fixing part

22, 41: front case 22a, 41a: vertical slot

23, 42: rear case 24: hinge portion

24a: long hole 30a: fixing hole

42a: engagement hole 42b: prevention hole

43: binding jaw 44: ground spring

45: ground protrusion 46: spring bent portion

46a: reverse jaw 47: support

The present invention relates to a shield case of a cathode ray tube, and more particularly, to improve the shield case for shielding electromagnetic waves generated from a circuit board, thereby simplifying the assembly and disassembly of the shield case during post-repair of the circuit board. The present invention relates to a shield case of a cathode ray tube, which can improve product productivity by preventing unevenness of the ground portion of electromagnetic wave shielding.

In general, a cathode ray tube (CRT) installed in a monitor case converts an electrical signal into an electron beam of three colors by an electron gun and displays it on a cathode ray tube fluorescent film, which is a circuit board attached to the neck portion of the cathode ray tube, that is, a horizontal frequency. In order to shield the electromagnetic waves generated from the generator of the shield case is essentially used.

In the conventional shield case, as illustrated in FIGS. 1 and 2, the surface of the cathode ray tube 10 composed of a panel and a funnel is positioned in the front of the monitor case (not shown). And a deflection yoke 12 that vertically and horizontally deflects R (red), G (green), and B (blue) electron beams scanned from the electron gun at the rear end of the neck portion 11 of the cathode ray tube 10. Is attached, and a circuit board 13 is attached to one end of the neck portion 11 by an adhesive member 14 such as a bone lamp.

In addition, a plurality of fastening holes 13a are formed in the circuit board 13 to fix the circuit board 13 in the shield case 20 for shielding electromagnetic waves, and the shield case 20 is formed on one side thereof. The front case 22 and the rear case 23 each having the fixing portion 21 protruding are integrally formed by a mold.

In addition, a vertical long hole 22a is formed at the center of the front case 22 so that the neck 11 of the cathode ray tube 10 is inserted.

In addition, a hinge portion 24 made of a thin plate is processed into a mold at the boundary between the front case 22 and the rear case 23 so that any one of the front case or the rear case 22 or 23 can be easily folded. On the horizontal surface of the hinge portion 24, a plurality of long holes 24a are arranged at equal intervals.

In the conventional shield case configured as described above, after the deflection yoke 12 is mounted on the rear end of the cathode ray tube 10 to deflect the electron beam horizontally and vertically, the neck 11 of the cathode ray tube 10 is rotated 90 degrees. It is inserted into the vertical slot 22a of the bent front case 22, and then the circuit board 13 is attached to one end of the neck 11 by the adhesive member 14 to fix it without flow.

At this time, the front case 22 can be bent smoothly by a plurality of long holes 24a formed in the hinge portion 24 in the horizontal direction.

Then, the fixing parts 21 protruding from the front case 22 and the rear case 23 are respectively inserted into the fastening holes 13a of the circuit board 13 embedded in the shield case 20, and at the same time, By soldering the end of the front part 21, the circuit board 13 is spaced apart from the required distance by the regulation, and a current is applied to the circuit board 13 to make an image on the fluorescent screen of the cathode ray tube 10.

However, in the conventional shield case configured as described above, since the shield case is processed into a single part by the front and rear case and the hinge part, the quality of the circuit board installed in the shield case cannot be maintained. As the safety standard increases the soldering process of the fixing part to maintain the distance, the productivity is lowered, and the hinge part is damaged by the repeated stress applied to the hinge part when the circuit board is separated, thereby losing the function of electromagnetic shielding.

Therefore, the present invention is to solve the above problems, the object of the present invention is that the front case and the circuit board integrally formed with a vertical hole having one side open so that the neck portion is inserted and a plurality of ground springs divided into the same size on both sides. The shield case is formed by combining the rear case with the fixing part for maintaining the distance of the safety standard, so that the rear case of the front case can be separated and produced to maintain the stability of quality, and the distance of the circuit board installed in the shield case. Productivity is improved by reducing the soldering work process of the fixing part to maintain the voltage, and it is easy to assemble and disassemble the shield case during the post-maintenance of the circuit board, and to shield the electromagnetic waves generated at the horizontal frequency generating part evenly. To provide a shield case for the tube.

The shield case of the cathode ray tube according to the present invention for achieving the above object is attached to the end of the neck portion of the cathode ray tube by an adhesive member of the circuit board, the electromagnetic wave generated in the circuit board by the internal circuit board In the shield case of the cathode ray tube for shielding the shielding, the vertical hole having one side open so that the neck portion of the cathode ray tube is inserted in order to shield the electromagnetic wave generated from the horizontal frequency generating portion when the current is applied to the circuit board in the enclosed shielded space The front case to be formed is coupled to the rear case in which the fixing part is mounted in order to keep the circuit board at a constant distance on a stable standard.

Hereinafter, a preferred embodiment of the shield case of the cathode ray tube according to the present invention will be described in detail with reference to the accompanying drawings.

3 to 8 are diagrams showing a shield case according to the present invention, and one end of the neck portion 11 of the cathode ray tube 10 is provided with a fixing hole 30a on one surface by an adhesive member 14 such as bonding. A fixed case 30 is provided, and a shield case 40 including a front case 41 and a rear case 42 is provided to shield electromagnetic waves generated from a horizontal frequency generator when a current is applied to the circuit board 30. .

In the center of the front case 41 is formed a vertical long hole (41a) is open one side so that the neck portion 11 of the cathode ray tube 10 is inserted.

In addition, a stepped binding jaw 43 is protruded on one surface of the front case 41 and a plurality of ground springs 44 having one end bent at equal intervals are formed on both sides, and the ground is formed. The ground protrusion 45 is protruded to secure the stability of the contact to the inner surface of the spring (44).

In addition, the front case 41 is formed in the outermost ground spring 44 is convexly formed with a spring bending portion 46 formed with a reverse stopper 46a, one end of which is fixed at the center portion so as to be coupled to the rear case 42. It is.

On the other hand, the upper surface of the rear case 42 is formed with a coupling hole 42a into which the binding jaw 43 of the front case 41 is inserted, and on both sides, a prevention hole 42b into which the reverse blocking jaw 46a is inserted is formed. have.

The support part 47 is inserted into the fixing hole 30a of the circuit board 30 and fixed by soldering on the inner bottom surface of the rear case 42 to maintain the circuit board 30 at a safety standard distance within the shield case 40. ) Is installed.

Referring to Figures 3 and 4 the operation of the shield case of the cathode ray tube configured as described above are as follows.

First, the rear end of the cathode ray tube 10 is equipped with a deflection yoke 12 for horizontally and vertically deflecting three color electron beams scanned from the electron gun, and a circuit at one end of the neck portion 11 of the cathode ray tube 10. Back case of shield case 40 in fixing hole 30a of circuit board 30 in order to keep circuit board 30 at a constant distance in accordance with safety standards while fixing substrate 30 without flow with an adhesive member ( 42) Insert the supporting part 47 installed on the inner bottom and fix it by soldering.

Thereafter, the operation of the circuit board 30 is examined and if there is no abnormality, the end of the binding jaw 43 of the front case 41 is rotated by 90 ° so as to be inserted into the coupling hole 42a of the rear case 42. Next, in the state where the binding jaw 43 is inserted into the coupling hole 42a, the front case 41 is rotated 90 ° to its original position, and one side of the front case 41 is opened with a vertical long hole 41a open at the cathode tube ( The neck 11 of 10 is inserted.

In addition, the ground springs 44 equally spaced on both sides of the front case 41 are brought into contact with the outer circumferential surface of the rear case 42 so that the front case 41 is artificially pressed to cover the rear case 42. The front case 41 is pushed and coupled until the reverse prevention jaw 46a formed at the outermost ground spring 44 is inserted into the prevention hole 42b formed at the rear case 42.

At this time, the contact with the rear case 42 is reliably maintained by the ground protrusion 45 protruding into the ground spring 44 of the front case 41 so as to uniformly shield the electromagnetic waves generated from the generation part of the horizontal frequency. can do.

On the other hand, when the front and rear case 41, 42 is to be separated, the pressing force is applied so that the reverse blocking jaw 46a of the ground spring 44 is separated from the prevention hole 42b of the rear case 42. Run in reverse order to separate.

As described above, according to the shield case according to the present invention, the front case and the rear case are separately produced to maintain the stability of quality, and the soldering work process of the fixing part for maintaining the distance of the circuit board installed in the shield case is reduced. As the productivity is improved, as well as the assembly and separation of the shield case during the post-maintenance of the circuit board, it is possible to uniformly shield the electromagnetic waves generated from the horizontal frequency generator.

Claims (4)

A circuit board is attached to one end of a neck portion of a cathode ray tube by an adhesive member, and the shield case of a cathode ray tube which shields electromagnetic waves generated from the circuit board by incorporating the circuit board, wherein the circuit board is installed in a closed shielded space. Front case in which vertical holes with one side open to insert the neck of the cathode ray tube to shield the electromagnetic waves generated from the generating part of the horizontal frequency when the current is applied, and a fixing part for maintaining the circuit board at a constant distance according to safety standards Shield case of cathode ray tube is coupled to the rear case equipped with. According to claim 1, wherein the front case is the same size at the same time the one side of the vertical hole is formed so that the neck portion of the cathode ray tube is inserted, the binding jaw and one end protruding to one surface to join the rear case Shield case of cathode ray tube composed of grounding spring divided into two parts. According to claim 1, wherein the rear case is a coupling hole formed to insert the binding jaw of the front case and the prevention hole is formed to prevent the separation by inserting a reverse prevention jaw of the front case, the circuit board at a predetermined distance Shield case of cathode ray tube composed of supporting protrusions spaced apart. According to claim 2, The grounding spring has a grounding protrusion protruding to the inner side to secure contact with the rear case, and one end at the fixed end in the center to prevent separation of the rear case coupled to the front case Shield case of the cathode ray tube is formed convex spring bent portion formed integrally with the reverse prevention jaw.