JP2003100404A - Crt socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an effective structure in down-sizing of a shape of CRT socket by simplifying a high voltage discharging gap constitution of the CRT socket for a CRT having plural focus means. SOLUTION: In the CRT socket for connecting a cathode-ray tube having plural focus means, an electrode A for the high voltage discharging gap is installed at a focus contact to be connected with one focus pin of the cathode- ray tube, and an electrode B of the earth connection side is installed opposing to this, and a low voltage discharging gap part is installed between other focus contacts to be connected with other focus pins and the one focus contact.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT (cathode ray tube; Cathode Ray Tu) used for color televisions, monitors and the like.
The present invention relates to a structure effective for simplifying the structure of a CRT socket connected to be) and further reducing the size.

[0002]

2. Description of the Related Art As CRTs used in color televisions, monitors for displays, and the like have become larger and have higher definition, double and triple focus tubes having a plurality of focusing means have been widely adopted. In order to obtain a higher voltage, wider angle and thinner, and to obtain a high-resolution image across the entire screen, the applied voltage difference between multiple focus terminal pins increases, and these focus terminal pins Further, high frequency dynamic voltage waveforms are being applied repeatedly. In order to prevent the circuit elements from being destroyed by the abnormal discharge energy that may be generated in the CRT tube, such a CRT socket for a plurality of focus tubes is used to short-circuit the abnormal discharge energy to the ground side. A discharge gap is generally built in for each part.

Here, as an example, a CR for a double focus tube
The general structure of the T socket will be described below. FIG. 8 shows a front side external view of a conventional CRT socket, FIG. 7 shows a rear side external view thereof, and FIG. The CRT socket 100 is composed of a ring-shaped portion 102, a cover portion 103, a base portion 104, and a cylindrical central hole 105, and the ring-shaped portion is outside the cylindrical central hole 105 of the housing formed by injection molding synthetic resin. A plurality of signal contact holes 106 are concentrically provided in the signal contact hole, and a signal contact storage chamber 161 is formed in the back side. A contact 162 of a conductive metal plate is disposed in the signal contact storage chamber 161. A ground metal 163 is provided with a gap provided, and is structured to be discharged to the outside when an abnormal voltage is applied.

The cover portion 103 accommodates conductive portions such as focus contacts 172a1 and 172a2 to which a high voltage is applied, and is formed of resin so as to close the base portion 104. Focus contact storage chambers 171a1 and 17 are provided on the back side of the cover portion at a position concentric with the ring-shaped portion.
1a2 is recessed, and the focus contact 17 is
2a1 and 172a2 are provided, grounding side terminals 173b1 and 173b2 are provided by providing a predetermined high voltage discharge gap. On the front side, the focus contact hole 107a1 corresponding to the focus contact storage chamber,
107a2 is arranged. Further, as shown in FIG. 6, focus terminal pins 231 and 232 provided on the CRT 20 to which a high voltage of 5 to 10 KV is applied are connected to the focus contacts 172a1 and 172a2, and 0 to
A plurality of signal terminal pins 22 to which a low voltage of 1000 V is applied are connected to the signal contacts 162, respectively. The ground connection side terminals 173b1 and 173b2 and the connection terminal 621 provided on the signal contact are connected to the circuit board 21 by soldering or the like.

Therefore, in the case of having a plurality of focus parts, conventionally, as shown in the structural diagram of the focus parts in FIG. 5, a high voltage discharge electrode is provided for each focus contact 172a1, 172a2 connected to each focus terminal pin. a1 and a2 are provided, and electrodes b1 and b2 are provided on the ground connection side terminals 173b1 and 173b2 so as to face them.
Was provided. Therefore, the high voltage discharge electrodes a1 and a2 and the ground connection side electrodes b1 and b2 are provided for each focus terminal pin.
Therefore, there is a technical problem that not only the structure of the CRT socket becomes large, but also the number of parts becomes large.

[0006]

SUMMARY OF THE INVENTION In view of the above situation, the present invention is a cathode ray tube C having a plurality of focusing means.
Simplified the high voltage discharge gap structure of RT socket,
The purpose of the present invention is to provide a structure effective for downsizing the RT socket shape.

[0007]

According to the present invention, the focus control high voltage is applied to each of the focus terminal pins. However, a relatively high voltage corresponding to the dynamic voltage is applied between the plurality of focus terminal pins. Focusing on the fact that a small voltage difference is generated, in a cathode-ray tube connection CRT socket having a plurality of focusing means, a high-voltage discharge gap electrode A is provided or provided on a focus contact connected to one focus pin of the cathode-ray tube. The electrode A is connected, and the ground connection side electrode B is provided facing the electrode A,
A low-voltage discharge gap part was provided between the electrode A provided or connected to another focus contact connected to another focus pin and the one focus contact.

Further, in the case of the double focus tube, the high voltage discharge gap electrode A provided or connected to the first focus contact connected to one of the first focus pins of the double focus cathode ray tube is opposed to the earth and grounded. The side electrode B is provided, and the low voltage discharge gap portion is provided between the second focus contact connected to the other second focus pin and the electrode A provided or connected to the first focus contact.

With such a structure, conventionally, when an abnormal backflow tube discharge is generated from the cathode of the cathode ray tube, discharge energy is supplied to the ground connection side through the high voltage discharge gaps W1 and W2. In contrast to the case where the substrate circuit element is protected, in the present invention, for example, in the case of the double focus tube CRT socket shown in FIG. 1, when an abnormal discharge occurs in one of the first focus terminal pins 231. Between the electrode A connected to the first focus contact 72A1 arranged facing the first focus contact hole 7A1 so as to connect one end to the first focus terminal pin 231 and the ground connection side electrode B. When an abnormal discharge occurs in the other second focus terminal pin 232 by flowing to the ground side through the high voltage discharge gap W0 It includes a second focus contact 72A2 which is disposed so as to face the second focus contact hole 7A2 so as to be connected at one end to the second focus terminal pins 232, the first focus contact 72A
1 flows to the electrode A side through the low voltage gap S provided between the electrode A and the electrode A connected to the electrode A, and further flows to the ground side through the high voltage discharge gap W0 between the electrodes A and B. However, the board circuit element is protected.

[0010]

BEST MODE FOR CARRYING OUT THE INVENTION A preferred embodiment of the present invention will be described below based on an example of a double focus tube. FIG. 1 shows a structural view of a main part of a CRT socket 1 according to the present invention, and FIG. 2 shows a housing in which a ring-shaped part 2 and a base part 3 are integrally resin-molded, and FIG. Figure, Figure 2
(B) shows a side view, a cylindrical center hole 5 is provided in the center of the ring-shaped portion 2, and the CRT electron gun portion is inserted. The cover part 3 is shown in FIG. 3, and FIG.
(B) shows an end view of the XX section. As shown in FIG.
An electrode A storage chamber 3A is provided in the cover portion 3 to insert the electrode A therein, and a first focus contact storage chamber 71A1 and a second focus contact storage chamber 71A2 are provided respectively.
The first focus contact 72A1 and the second focus contact 72A2 are housed and arranged in a V shape, the electrode B housing chamber 3B is provided, and the electrode B is inserted. The connection relationship will be described with reference to FIG. The first focus contact 72A1 is disposed so that one end faces the first focus contact hole 7A1 so as to be connected to one of the first focus pins 231 of the CRT socket 1. A lead wire connecting portion 272A1 is provided at the other end of the first focus contact 72A1, and the first focus contact connecting portion 172A1 and the connecting portion AW of the focus contact of the electrode A are pressure-connected. A ground connection side electrode B is provided facing this electrode A via a predetermined high voltage discharge gap W0, and is connected to a ground connection side terminal 73B.

The other second focus pin 232 of the CRT
Second focus contact hole 7A2
To the second focus contact 72A2.
And a lead wire connecting portion 272A2 is provided at the other end. A low voltage discharge electrode portion AS is provided at the other end of the electrode A, one of which is brought into contact with the first focus contact 72A1,
The second focus contact 72A2 is also provided with the low-voltage discharge electrode portion 172A2, and the low-voltage discharge gap S is formed therebetween.

Here, the high-voltage discharge gap W0 is set according to the abnormal discharge energy, but since a high voltage of 5 to 10 KV is normally applied to the focusing terminal pin, it is 3 to 5 KV from this voltage. Set high. The low voltage discharge gap S is usually set to about 2 to 3 KV in consideration of the voltage difference between the two focusing terminal pins and the dynamic voltage width.

In the embodiment of the invention described above, FIG.
Since the electrode A is formed separately from the focus contact and the focus contact connecting portion AW and the low-voltage discharge electrode portion AS are provided on the electrode A as shown in FIG. 3, the first focus contact 72A1 and the second focus contact 72A2 are The shape can be standardized and arranged in a V shape,
The electrode A portion may extend from the first focus contact 72A1 and may be integrally formed. Note that the configuration of the ring-shaped portion (signal portion) is almost the same as that of the conventional CRT socket, and the description thereof will be omitted.

Although the double focus tube has been mainly described in the embodiments of the present invention, the electrode A and the ground connection side electrode B are provided in the center focus contact also in other triple focus tubes.
In addition, the low voltage discharge gap S can be provided between the center focus contact and the other focus contacts on both sides to expand the focus contact.

[0015]

According to the present invention, the high-voltage discharge gap W provided or connected to one focus contact.
Since the low voltage discharge gap S is formed between the zero electrode A and another focus contact, the other focus contact can also use the high voltage discharge gap electrode A, and the electrode component Not only can the number of points be reduced, but the high-voltage discharge gap can be limited to only one place, so the space can be reduced,
The shape of the CRT socket can be made smaller.

[Brief description of drawings]

FIG. 1 is a structural view of a main part of a CRT socket 1 according to the present invention.

FIG. 2 shows a housing of a CRT socket 1.

FIG. 3 shows a cover portion of a CRT socket 1.

FIG. 4 shows a diagram of components arranged in the cover portion of the CRT socket 1.

FIG. 5 shows a structural example of a focus portion of a conventional CRT socket 100.

FIG. 6 shows a cross-sectional view of a main part of a conventional CRT socket 100.

FIG. 7 is a rear side external view of a conventional CRT socket 100.

FIG. 8 shows a front side external view of a conventional CRT socket 100.

[Explanation of symbols]

1 CRT socket 2 according to the present invention 2 ring-shaped part 3 cover part 3A electrode A storage chamber 3B electrode B storage chamber 4 base 5 cylindrical center hole 6 signal contact hole 7A1 first focus contact hole, 7A2 second focus contact hole 72A1 first focus contact, 72A2 second focus contact
Focus contact 172A1 First focus contact connecting part 172A2 Low voltage discharge electrode part 272A1 of second focus contact Lead wire connecting part 272A2 of first focus contact Lead wire connecting part 73B of second focus contact Ground connection side terminal A High voltage discharge gap Electrode B Grounding-side electrode W0 High-voltage discharge gap S Low-voltage discharge gap AW Connection with focus contact AS Low-voltage discharge electrode

Claims (2)

[Claims] 1. In a cathode ray tube connecting CRT socket having a plurality of focusing means, a high voltage discharge gap electrode A is provided or connected to a focus contact connected to one focus pin of the cathode ray tube and is opposed to the electrode A. And a ground connection side electrode B is provided, and a low voltage discharge gap portion is provided between another focus contact connected to another focus pin and the electrode A provided or connected to the one focus contact. CRT socket. 2. In a CRT socket for connecting a double focus cathode ray tube, facing a high voltage discharge gap electrode A provided or connected to a first focus contact connected to one first focus pin of the double focus cathode ray tube, The second focus contact that is provided with the ground connection side electrode B and is connected to the other second focus pin and the first focus contact
A CRT socket, characterized in that a low voltage discharge gap is provided between the focus contact and the electrode A provided or connected to the focus contact.