KR950002078Y1 - Static electricity protection apparatus - Google Patents

Abstract

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Description

Noise canceling static shielding device

1 is a position diagram of the present invention use state.

2 is a mounting state of the present invention.

3 is an exploded perspective view of the main part of the present invention.

4 is a schematic diagram of installation of a metal plate for noise shielding, (a) is a conventional installation state diagram, and (b) is a state diagram for use of the present invention.

5 is a circuit diagram illustrating an operation state of the present invention, (a) is an operation state circuit diagram of the present invention, and (b) is a schematic view showing an electrostatic shield effect.

* Explanation of symbols for main parts of the drawings

1: CRT 2: PCB Board

3: transistor 4: heat sink

5, 5 ': Lead rod 6, 6': Solder

7, 7 ': shielding plate 8, 8': heat dissipation

9, 9 ', 9 ", 10, 10', 10": insertion hole 11: insertion hole

In the present invention, in a computer CRT display device, when a CRT is driven to generate a screen, noise generated by a high frequency signal response is radiated to the outside of the device, thereby generating an electrostatic shielding effect. It relates to a CRT high frequency noise canceling electrostatic shielding device.

In order to shield the noise generated by the high frequency radiation to the outside of the device in order to shield the entire inside of the device to install a weight, the weight of the device is heavy and inconvenient to move, the price of the shield chassis to use a large amount of steel plate price It became a factor.

The present invention solves all these drawbacks by attaching a transistor in which a signal is amplified in a PCB substrate with a built-in image output circuit, embedded in an aluminum heat sink, and a PCB with a built-in image output circuit as a shielded chassis. By covering the bay, a static shielding effect is generated to cancel high frequency noise, and a small amount of shielding steel plate is used to print the price. The purpose of this is as follows. .

Insertion holes (9, 9 ') (9) at the position where the transistor (3) to amplify the signal is attached to the PCB (2) with the image output hero for driving the CRT (1). &Quot;), the outside of the substrate 2 is covered with a shielding chassis 7 in which heat dissipation holes 8 and 8 'are laid, and the shielding chassis 7' in which the CRT insertion opening 11 is formed is inserted and removed. And inserting the insertion holes 10, 10 'and 10 "into which the heat sink 4 and the lead rod 5 are inserted at a position opposite to the insertion holes 9, 9' and 9". The transistor 3 is embedded in the plurality of heat sinks 4 so that one side lead rod 5 of the heat sink 4 is inserted into the PCB 2 insertion hole 9, 9 ′, 9 ″. The other side rod 5 'is inserted into the shielding chassis 7' insertion hole 10, 10 'and 10 ", and then fixed by soldering 6 and 6' and the heat sink 4 is electrostatic shielded. Both sides are in contact with the PCB and the shielding chassis 7 'so that the image output circuit is incorporated into the shielding metal plates 7 and 7'. A high-frequency noise (NOISE) for canceling an electrostatic shield configured to surround only the substrate 2 in the box.

Looking at the operation and effects of the present invention configured as described above are as follows.

The PCB 3 surrounded by the □ shielding metal plate 7 on which a plurality of heat dissipation holes 8 and 8 'are laid, the transistor 3, and the transistor 3 into the insertion holes 9, 9' and 9 ". The heat sink (4) incorporating the heat sink (4) into the lead rod (6) to fix the insertion hole (10) (10 ') (10 ") of the shielding metal plate (7') on one side of the heat sink (4) The heat sink 4 is symmetrically contacted between the PCB and the shielding metal plate 7 'by inserting it in the fixed position and fixed by soldering 6', and the electrostatic shield is placed on the induction side and the induction side. By inserting a grounded conductor between them, the induced noise is bypassed. A grounded heat sink 4 conductor is inserted between the high frequency generating PCB and the shielding metal plate 7 'to prevent the electrostatic shielding effect. As shown in (b) of FIG. 5) and noise is excluded.

The present invention improves the quality of the device by eliminating the high frequency noise by using the electrostatic shielding effect on each of the image output transistors, and the high frequency noise is shielded by using the small shielding metal plate from the large shielding metal plate, thereby greatly reducing the cost. It is an idea.

Claims (1)

In a PCB substrate 2 having an image output circuit for driving a CRT 1, an insertion hole 9, 9 'is provided at a position to which a transistor 3 for amplifying a signal is attached. 9 "), the outside of the board | substrate 2 is covered with the shielding chassis 7 in which the heat dissipation holes 8 and 8 'were laid, and the shielding chassis 7' which formed the CRT insertion opening 11 was removed. Insertion holes 10, 10 'and 10 "into which the heat sink 4 and the lead rod 5' are inserted are positioned at the position opposite to the insertion holes 9, 9 'and 9". The transistor 3 is embedded in the plurality of heat sinks 4 so that the lead rod 5 on one side of the heat sink 4 is inserted into the PCB 2 insertion hole 9, 9 ', 9'. The other lead rod (5 ') is inserted into the shielding chassis (7') insertion hole (10) (10 ') (10 ") and soldered (6) (6'), and the heat sink (4) is electrostatic Both sides of the PCB 2 are in contact with the shielding chassis 7 'so that the shielding effect is generated, and the shielded metal plates 7 and 7' have an image output circuit built therein. High-frequency noise (NOSE) offset for the electrostatic shield, characterized in that is configured to enclose only the non-substrate 2 in the box.