KR0112702Y1 - Structure of shield case of cathode ray tube - Google Patents

Abstract

The present invention relates to a shield case fastening structure of a cathode ray tube, and includes an insertion hole into which a neck portion of a cathode ray tube is inserted, and an upper case formed with a coupling hole and a heat dissipation hole, and a coupling protrusion that is fitted to the coupling hole of the upper case. Fixing the circuit board by fixing the circuit board to the lower case in which the first and second support parts protrudingly formed to fix the circuit board without flow and the heat dissipation holes for dissipating heat generated from the circuit board are integrally formed. Material cost and labor are reduced by removing the screw, which is easy to remove the circuit board during post maintenance due to the damage of the circuit board, and the circuit board is inserted into the closed shielded space of the shield case. It is possible to reliably shield the electromagnetic waves, which can improve the reliability of the product.

Description

Shield Case Binding Structure of Cathode Ray Tube

1 is an exploded perspective view schematically showing a shield case binding structure of a conventional cathode ray tube.

2 is an assembled cross-sectional view of the shield case binding structure shown in FIG.

Figure 3 is an exploded perspective view schematically showing the shield case binding structure of the cathode ray tube according to the present invention.

4 is an assembled sectional view showing the shield case binding structure of the cathode ray tube according to the present invention.

* Explanation of symbols for main parts of the drawings

10 cathode ray tube 11 neck portion

12: deflection yoke 13: circuit board

13a: screw hole 14: adhesive member

15: screw 20, 30: shield case

21: side case 22: rear case

22a: coupling hole 23: bending piece

24: engaging projection 31: upper case

31a: insertion hole 31b, 32a: heat dissipation hole

31c: coupling hole 32: lower case

33: engaging projection 34, 35: the first and second support

This invention relates to a shield case binding structure of a cathode ray tube, and more particularly, a circuit attached to a cathode ray tube (CRT) by improving the binding structure of a shield case for shielding electromagnetic waves generated from a circuit board. The present invention relates to a shield case binding structure of a cathode ray tube, which simplifies fixing or detaching of a substrate and reliably shields electromagnetic waves.

In general, the cathode ray tube is shown for the fluorescent film of the cathode ray tube by converting the electrical signal into an electron beam by an electron gun, the shield case for shielding the electromagnetic wave generated from the circuit board attached to the neck portion of the cathode ray tube is essentially used have.

In the conventional shield case, as shown in FIGS. 1 and 2, the fluorescent 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). A deflection yoke 12 is installed at the rear end of the neck portion 11 of the cathode ray tube 10 to deflect the electron beam scanned by the electron gun vertically and horizontally, and at one end of the neck portion 10 is a circuit board. (13) is attached by an adhesive member 14 such as bonding.

In addition, a screw hole 13a is formed at the side surface of the circuit board 13 to fix the plurality of screws 15 to the shielding case 20 for protecting the board, and the shield case 20 has an open side surface. It consists of a side case 21 of the mold and a rear case 22 coupled thereto, and a bent piece 23 bent inward so that the circuit board 13 can be seated on the upper surface of the side case 21. In the bottom surface, a plurality of engaging projections 24 which are forcibly fitted to the engaging holes 22a formed in the rear case 22 are protruded.

The conventional shield case binding structure configured as described above is equipped with a deflection yoke 12 for horizontally and vertically deflecting an electron beam at the rear end of the cathode ray tube 10 and at one end of the neck portion 11 of the cathode ray tube 10. After attaching the circuit board 13 to the adhesive member 14, the shield case 20 is assembled by inserting the circuit board 13 into the side case 22a while being fixed in the monitor case.

Thereafter, the plurality of screw holes 13a formed on all sides of the circuit board 13 and the holes of the bent pieces 23 formed inside the side case 21 coincide with the screw 15 to fix the circuit. The current is applied to the substrate 13 to form an image on the fluorescent surface of the cathode ray tube 10.

However, the conventional shield case coupling structure configured as described above has a large number of screw holes on all sides of the circuit board in order to fix the circuit board to the shield case for shielding electromagnetic waves. Since a large number of screws are used, it is cumbersome to separate them during post maintenance due to the increase of material cost and damage of the circuit board, and the circuit board is mounted on the shield case with one side open, so that the electromagnetic wave generated from the horizontal frequency generator is properly shielded. There was a problem that the reliability of the product is not reduced.

Accordingly, the present invention is to solve the above problems, and the object of the present invention is to install a shield case in the monitor case which can simplify the fixing or detachment of the circuit board. This reduces material costs and labor, and makes it easy to separate circuit boards during post-maintenance due to damage to the circuit board, and inserts into the closed space of the circuit board shield case to shield the electromagnetic waves generated from the horizontal frequency generator. It is to provide a shield case binding structure of the cathode ray tube that can improve the reliability of the.

Features of the shield case binding structure of the cathode ray tube according to the present invention for achieving the above object, the circuit board is attached to one end of the neck portion of the cathode ray tube by an adhesive member, to shield the electromagnetic wave generated from the circuit board In the shield case fastening structure of the cathode ray tube to which the side and the rear case are coupled to each other, the upper case having a coupling hole, the lower portion formed integrally with the fixing projection of the circuit board and the coupling protrusion for interference fit to the coupling hole of the upper case It is provided in the case.

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

Figure 3 relates to the shield case binding structure of the cathode ray tube according to the invention, the circuit board 13 is attached to one end of the neck portion 11 of the cathode ray tube 10 by an adhesive member 14 such as bonding, A shield case composed of an upper case 31 and a lower case 32 having one side open to shield electromagnetic waves generated from the horizontal frequency generator of the circuit board 13 when a current is applied to the circuit board 13 ( 30) is provided in the monitor case.

In addition, an insertion hole 31a into which the neck portion 11 of the cathode ray tube 10 is inserted is formed at the center of the upper case 31, and heat generated from the circuit board 10 around the insertion hole 31a. A plurality of heat dissipation holes 31b are formed to dissipate heat, and a coupling hole 31c is formed on the upper side of the upper case 31 so that the lower case 32 is interfitted and combined.

In addition, a coupling protrusion 33 protrudes from an upper surface of the lower case 32 coupled to the upper case 31, and heat dissipation holes 31a are formed on both sides of the lower case 32 so as to correspond to each other, and the lower case. (32) A first support portion 34, which is a fixing means for fixing the circuit board 10, is formed on the inner inclined surface. In addition, a second support part 35, which is a fixing means having a predetermined gap, protrudes toward the inner side of the lower case 32 in the lower direction of the first support part 34, which is the fixing means.

Referring to Figure 4 the operation of the shield case binding structure of the cathode ray tube configured as described above are as follows.

First, the rear end of the cathode ray tube 10 embedded in the monitor case is equipped with a deflection yoke 12 for horizontally and vertically deflecting three color electron beams scanned from the electron gun, and the neck portion 11 of the cathode ray tube 10. ) Is inserted into the insertion hole 31a formed in the upper case 31 of the shield case 30, and then fixedly installs the circuit board 13 with an adhesive member 14 such as bonding at one end of the neck portion 11. .

In addition, when the circuit board 13 is pressed from the outside to fix the inside of the lower case 32, the bottom surface of the circuit board 23 on the first support portion 34, which is a fixing means protruding from the inner surface of the lower case 32; At the same time, the upper surface of the second support part 35, which is a fixing means, is touched by the pressing force which is continuously pressed. That is, the circuit board 13 is inserted between the first and second support parts 34 and 35, which are fixing means of the lower case 32, so that the circuit board 13 can be easily fixed or separated. .

The shield case 30 is assembled by inserting the coupling protrusion 33 protruding from the lower case 32 into the coupling hole 31c of the upper case 31, and then applying a current to the circuit board 13. At the same time, electromagnetic waves generated from the horizontal frequency generator are shielded by the sealed shield case 30 and heat generated from the circuit board 13 is radiated through the heat dissipation holes 31b formed in the upper and lower cases 31 and 32. 32a), the electrical signal passing through the electron gun is converted into an electron beam to accurately form an image on the fluorescent surface of the cathode ray tube 10.

As described above, according to the shield case fastening structure of the cathode ray tube according to the present invention, the screw, which is a fixing member when fixing the circuit board, is removed by the shield case installed in the monitor case, thereby reducing the material cost and work labor, and damaging the circuit board. It is easy to remove the circuit board during post maintenance, and the circuit board is inserted into the closed shielded space of the shield case, so that the electromagnetic waves generated from the horizontal frequency generator can be shielded to improve the reliability of the product.

Claims (2)

A circuit board is attached to one end of the neck portion of the cathode ray tube by an adhesive member, and in the shield case binding structure of the cathode ray tube for shielding electromagnetic waves generated from the circuit board, a heat dissipation hole and a cathode ray for radiating heat from the circuit board. Shield case fastening structure consisting of an upper case formed with an insertion hole and a coupling hole into which the tube neck part is inserted, and a lower case integrally formed with a fixing protrusion of the circuit board and an engaging protrusion for tightly fitting the coupling hole of the upper case. The shield case fastening structure of claim 1, wherein the fixing means of the lower case comprises first and second supporting parts protruding to fix the circuit board without flow.