JPS6111910Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a cathode ray tube socket board that is attached to a cathode ray tube of a TV receiver.

Since a fairly high voltage is applied to the anode electrode of a cathode ray tube, spark discharge may occur between the anode electrode and other electrodes due to impurities that enter the tube during the manufacturing process of the cathode ray tube. Such spark discharges can damage the cathode coating inside the tube and destroy external electronic components, especially transistors, so the discharge is usually caused outside the tube. Such measures are being taken. In other words, conventionally, a discharge element as a discrete component consisting of a pair of lead wires facing each other with a predetermined gap is connected between the terminal of a socket into which the pin terminal of the cathode ray tube is inserted and the ground. This has been done by using a cathode ray tube socket with an internal discharge mechanism, or by providing a through hole for discharge in the insulating substrate to which the cathode ray tube socket is attached, and by providing a discharge electrode across this through hole. . However, when using discharge elements as discrete components, typically 5 to 7 elements are required, which requires a considerable amount of installation space, which prevents the miniaturization of cathode ray tube socket boards.
There is a problem in that the installation work is also complicated. In addition, when using a cathode ray tube socket equipped with a discharge mechanism, the socket itself becomes expensive due to the complicated internal structure, and the socket becomes large due to the complicated internal structure, and the size of the board to which it is attached increases. There is a problem in that miniaturization is prevented. Furthermore, in the case where a through hole is provided in the board to which the cathode ray tube socket is attached, the through hole is exposed to the outside, so dust can adhere to the vicinity of the through hole due to the electrostatic attraction of the discharge electrode part. This poses a problem in that the discharge action becomes unstable and leakage current flows, resulting in a loss of image quality. In addition, when a discharge element is used as a discrete component or when a through hole is simply provided in a substrate, there are problems such as the generation of spark noise when discharge occurs, which gives an unpleasant sensation.

The present invention has been developed in view of these points, and it can be configured extremely compactly, the discharge action is stable, and the spark noise when discharge occurs is reduced, thereby eliminating unpleasant sensations. The purpose of the present invention is to provide a cathode ray tube socket board that does not require a conventional cathode ray tube socket.

An embodiment of the present invention will be described in detail below with reference to the drawings.

Fig. 1 is a cross-sectional side view of the main part of the cathode ray tube socket board, and Figs. 2 and 3 are partial plan views showing the main part of the board surface. Fig. 2 shows the front side, and Fig. 3 shows the back side. show. In these figures, 1 is an insulating substrate made of alumina porcelain etc., 2, 3, 4, 5,
Reference numerals 6, 7, 8, and 9 are through holes provided in a circular arc shape at predetermined positions on the substrate 1, into which pin terminals of a cathode ray tube socket, which will be described later, are inserted.
10, 11, 12, 13, 14, 15, 16, 1
Terminal electrodes 18, 19, 20, 2 provided on the surface of the substrate 1 so as to surround the through holes, respectively.
Terminal electrodes 1, 22, 23, 24, and 25 are provided on the back surface of the substrate 1 so as to surround the through holes, respectively. Here, the through hole 3 is used to insert a pin terminal for grounding the cathode ray tube, and the electrode 19 on the back side of the board is a ring-shaped ground electrode provided at the center of the back side of the board surrounded by the through holes 2 to 9. 2
6. 27, 28, 29, 30,
31, 32, and 33 are the terminal electrodes 18 and 20 to 25 on the back side of the board, respectively, and the ground electrode 2.
6, and these recesses are provided with discharge electrodes drawn out from each of the electrodes 18, 20 to 25, and 26. There is. Although not shown, on the insulating substrate 1 there are necessary cathode ray tube peripheral circuits such as a color output circuit in the case of a color TV receiver, and necessary cathode ray tube peripheral circuits such as a video output circuit in the case of a monochrome TV receiver. Electronic components such as transistors, resistors, and capacitors constituting the tube are arranged, and the required output terminals of each are connected to the electrodes of the through holes into which the pin terminals of the cathode ray tube socket are inserted. 34 is a cathode ray tube socket attached to the front side of the board 1, and pin terminals 35 led out to the back side of the socket body are inserted into respective predetermined through holes 2 to 9, and solder is applied to the terminal electrodes around each through hole. It is attached and fixed. A dustproof cover 36 is attached to the back side of the insulating substrate 1, and is formed to cover the recesses 27 to 33 forming the discharge gap. This dustproof cover 36 has a fourth
As shown in the figure, the recesses 27 to 3 on the back surface of the substrate 1
A recess 37 is formed at a location corresponding to the discharge electrode portion provided at 3. Board 1 of this dustproof cover
Although not shown, the attachment to the dust cover 3
6 and the cathode ray tube socket 34, or by directly fixing them to the substrate 1 with an adhesive.

Although the cathode ray tube socket board of the present invention is constructed as described above, the above is just one example and is not limited to the above in any way. For example, the ground electrode 26 does not need to be ring-shaped as in the above embodiments, and can take any suitable shape as necessary. In addition, substrate 1
and the cathode ray tube socket 3 on the dustproof cover 36.
4. If necessary, a through hole having the same diameter as the through hole normally provided in the central portion may be provided coaxially. Further, although the recess 37 formed in the dustproof cover 36 is shown in the form of a single narrow groove in FIG. 4, it may be formed independently for each discharge electrode. Furthermore, it is also possible to form the dustproof cover 36 by dividing it into a plurality of pieces. Furthermore, when the voltage applied to the focus electrode of the cathode ray tube is high, it is not possible to obtain the specified creepage distance by simply forming the discharge gap with a recess. A discharge gap is formed by a recess,
It is also possible to use conventional discharge means for the focus electrode.

As described above, the cathode ray tube socket board of the present invention has a concave part forming a discharge gap on the back side of the board to which the cathode ray tube socket is attached, a discharge electrode is provided in this concave part, and this part is covered with a dustproof cover. Therefore, the discharge means is integrated into an extremely compact structure, which promotes the miniaturization of the cathode ray tube socket board.The discharge gap does not penetrate the board, and is covered with a dustproof cover, which prevents dust from entering the discharge gap. Adhesion is prevented, the discharge action becomes extremely stable, and spark noise when discharge occurs is also reduced, resulting in no unpleasant sensations.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional side view of essential parts of a cathode ray tube socket board according to an embodiment of the present invention, FIGS. 2 and 3 are partial plan views showing essential parts of the insulating board, and FIG. FIG. 3 shows the back side, and FIG. 4 is a perspective view of the dustproof cover used for the cathode ray tube socket board of the present invention. 1...Insulating substrate, 2, 3, 4, 5, 6, 7,
8, 9...Through hole, 10, 11, 12, 13, 1
4, 15, 16, 17, 18, 19, 20, 2
1, 22, 23, 24, 25...terminal electrode, 26
...Earth electrode, 27, 28, 29, 30, 3
1, 32, 33... recess, 34... cathode ray tube socket, 35... pin terminal, 36... dustproof cover, 37... dent.

Claims (1)

[Scope of utility model registration request] An insulating substrate, a plurality of through holes provided in an arc shape at predetermined positions of the insulating substrate, and a plurality of terminal electrodes provided on the front and back surfaces of the substrate so as to surround each of these through holes, respectively; a cathode ray tube socket, in which pin terminals led out to the back side of the socket main body are inserted into each of the through holes from the front side of the board, and are connected and fixed to the terminal electrodes around the through holes, respectively, and attached to the board; a cathode ray tube peripheral circuit configured on an insulating substrate and connected to the required electrode; a ground electrode provided at a position surrounded by a plurality of through holes on the back side of the substrate;
A plurality of discharge electrodes are provided to face each other between this ground electrode and required electrodes on the back side of the substrate among the terminal electrodes surrounding the through hole, and a plurality of discharge electrodes are provided on the substrate surface between these opposing discharge electrodes. A cathode ray tube comprising a plurality of recesses provided therein, and a dustproof cover attached to the back side of the substrate so as to cover these recesses, and having a recess provided in a portion corresponding to the discharge electrode. socket board.