JPH0532952Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Field of Application) The present invention relates primarily to a cathode ray tube socket for a color television receiver.

(Prior Art and its Problems) Generally, in a cathode ray tube for a color television receiver, it is necessary to reduce the aberration of the electron lens in order to improve its image quality. For this reason, the focus voltage has become significantly higher in recent years.

On the other hand, voltage is introduced into the electrodes of cathode ray tubes, except for the anode, through the contacts of the cathode ray tube socket and from stem pins implanted in a circular arrangement in the stem, but as the focus voltage has become higher in recent years, Dielectric breakdown between the focus contact and other contacts in this cathode tube socket is becoming more likely to occur.

Dielectric breakdown between the focus contact and other contacts includes phenomena such as voltage leakage and discharge, and surface leakage occurs particularly in cathode tube sockets molded with an insulator.

There are the following conventional cathode ray tube sockets that take measures to prevent dielectric breakdown between the focus contact and other contacts.

FIGS. 6 to 9 show an example of a conventional structure. As shown in FIG. A cathode ray tube base 4 is used, which is fitted with the stem pins 3, 3... of be joined to. A cylindrical high-voltage insulating barrier 5 is integrally formed on the cathode ray tube base 4 so as to surround the focus stem pin 2 .

On the other hand, in the cathode ray tube socket, as shown in FIGS. 7 and 8, a cylindrical center hole 11 is opened in the center of the socket body 10 on both sides, and a focus contact receiving hole 12 is formed on the same circle around the cylindrical center hole 11. , and other contact receiving holes 13, 13, . . . are provided. A focus contact 14 is inserted into the focus contact housing hole 12 from the surface side of the socket 10.
The lead wire connecting terminal 14a thereof is connected to a lead wire within a box-shaped insulating barrier 15. In addition, each other contact accommodation hole 13
Insert the contact 1 from the back side of the socket body 10.
6 is inserted, its lead wire connection terminal 16a is led out along the back surface, and its tip is connected to the printed circuit board 1.
7 and soldered to the printed wiring on the back side.

Further, around the focus contact receiving hole 12, a barrier fitting groove 18 is formed from the surface side of the socket 10 into which the high voltage insulation barrier 5 of the base 4 is fitted. Then, as shown in FIG. 8, when the base 4 is attached to the neck tube section 1 and the socket main body 10 is fitted thereto, the periphery of the focus contact 14 and the focus stem pin 2 becomes a high voltage insulating barrier. 5, and the creepage distance between these and other stem pins and contacts is increased to make it difficult for surface leakage to occur.

However, with the surface leak prevention measures using the insulating barrier 5 and the barrier fitting groove 18 as described above, due to the recent increase in focus voltage and miniaturization of devices, the lead wire connection terminal 14a of the focus contact 14 Between the root portion and the end portion on the lead wire connection terminal 16a side of another contact 16 adjacent thereto (the portion indicated by arrow A in FIG. 9), and between the root portion of the lead wire connection terminal 14a of the focus contact 14 and this There is a possibility that surface leakage may occur between the tip portions of other contacts 16 adjacent to each other (the portions B and C in FIG. 9), resulting in a problem that sufficient reliability cannot be obtained.

In order to solve such problems, Figure 10,
As shown in FIG. 11, there is a socket in which recessed portions 19a and 19b are provided between the barrier fitting groove 18 on the surface of the socket body 10 and another contact receiving hole 13 adjacent thereto. In the cathode ray tube socket shown in FIG. 9, the creepage distance in the area indicated by arrow C in FIG. is left behind.

In addition, as shown in FIG. 12, the socket body 10
A recessed notch 20 is formed on the inner surface of the cylindrical center hole 12 on the back side of the
However, in this type of cathode ray tube socket, the creepage distance at the portions indicated by arrows B and C in FIG. 9 is not sufficient, and the above-mentioned problem still remains.

Furthermore, as shown in FIG.
A type of cathode ray tube socket in which the opening on the back side of the socket main body is closed with an insulating material 21 has been devised, but in this type of cathode ray tube socket, although the creepage distances indicated by arrows B and C in Fig. 8 are sufficient, However, the problem mentioned above still remains.

Further, the exhaust pipe section 1a of the neck pipe section 1 needs to be inserted into the cylindrical center hole 11, and the insulating material 21
When the cylindrical center hole 11 is closed with
It is no longer possible to fit the cathode ray tube socket into this, and the overall height of the cathode ray tube socket increases, creating a problem when trying to downsize the receiver.

Further, in the conventional cathode ray tube socket described above, the inner surface of the cylindrical center hole 11 is in contact with the outer surface of the cylindrical portion of the base 4 over the entire circumference at any position, or is in a state in which it is close to the outer surface of the cylindrical portion of the base 4 with a slight gap. Therefore, there is a problem in that condensation is drawn into the gap by capillary action, making it difficult to evaporate, and this condensation becomes a conductor, causing dielectric breakdown.

(Problems to be solved by the invention) In view of the above-mentioned conventional problems, the present invention is designed to prevent the surface leaks indicated by arrows A to C in FIG. The object of the present invention is to provide a more reliable cathode ray tube socket in which dew condensation is less likely to accumulate on the side end surfaces and within the cylindrical center hole, and dielectric breakdown between the focus contact and other contacts is less likely to occur under high pressure.

(Means for Solving the Problems) The feature of the present invention for solving the conventional problems as described above is that it has a cylindrical center hole penetrating the front and back sides,
A focus contact accommodating hole and another contact accommodating hole are arranged concentrically with the cylindrical center hole, and a high voltage insulation barrier for the focus contact provided on the cathode ray tube base is inserted around the focus contact accommodating hole. In a cathode ray tube socket provided with a flexible barrier fitting groove, the cylindrical center hole is provided between the open part of the barrier fitting groove on the inner wall surface of the cylindrical center hole and the other contact receiving hole position adjacent thereto. The central hole has a concave groove with a communicating opening at both ends.

(Function) This cathode ray tube socket has a concave groove formed on the inner wall surface of the cylindrical center hole, which communicates with both ends of the center hole. Since the root also has a groove, the creepage distance between the focus contact and other contacts is sufficient, and when it is attached to a cathode ray tube, the front and back sides of the socket will fit into the groove described above. This serves as a ventilation path, allowing condensation to quickly evaporate, thereby preventing dielectric breakdown of the focus contact.

(Example) Next, an example of implementing the present invention will be described with reference to FIGS. 1 to 4.

In the figure, 10 is a cathode ray tube socket body, and this socket body 10 includes, as in the conventional case,
A focus contact accommodating hole 12 and other contact accommodating holes 13, 13, . . . are provided around the cylindrical center hole 11 and concentrically arranged therewith.

A barrier fitting groove 18 is provided around the focus contact receiving hole 11 . A focus contact 14 is inserted into the focus contact housing hole 11 from the front surface side of the socket body 10. A lead wire connection terminal 14a integrally projected from the lower end of the focus contact 14 is guided into the insulating cover 15 across the bottom of the barrier fitting groove 18, and the lead wire is connected therein.
On the other hand, the contacts 1 are inserted into the other contact housing holes 13, 13 from the back side of the socket body 10.
6, 16... are inserted, and the lead wire connection terminal portions 16a, 16a... integrally protruding from the lower end thereof are led out radially along the back surface of the socket main body 10, and their tips are bent at right angles and printed. It penetrates the board 17 and is soldered to printed wiring on the back surface thereof.

Further, the barrier fitting groove 18 and the adjacent contact receiving holes 13, 13 at both ends are spaced apart to the extent that one contact receiving hole is provided in each, and the back side of the socket body in that area Recesses 22, 22 for reducing the amount of synthetic resin molding material are formed, leaving the peripheral wall of the cylindrical center hole 12 intact. Further, in both of these spaces, a groove 2 is formed on the inner wall surface of the cylindrical center hole 12 toward its center line.
3 and 23 are provided. These grooves 23, 23
are formed so as to be connected from the front surface to the back surface of the socket body 10, and are formed at a depth extending from the inner circumferential surface of the cylindrical center hole 12 to the aforementioned recesses 22, 22.

The cathode ray tube socket constructed in this way has a lead wire connection terminal portion 1 of the focus contact 14.
As shown in FIG. The length extends from the outer rising surface to the surface of the socket main body of the groove 23 (arrows B and C in the figure), and the creepage distance from the outer rising surface to the lead wire connection terminal part of the other contact 16 is the same as that of the barrier fitting hole. The length extends from the bottom surface of the groove 18 through the concave groove 23 and the concave portion 22 (arrow A in the figure).

Although not shown in the figure, the cylindrical center hole 1
When the central cylindrical portion of the cathode ray tube base 4 is fitted into the socket 2, the concave groove 23 becomes a ventilation path that communicates with the front and back of the socket body, thereby removing dew condensation.

In addition, in the present invention, in addition to the above-mentioned arrangement, the recessed groove 23 may be provided in the recessed portion 19b as shown in FIG.

(Effects of the invention) As mentioned above, the cathode ray tube socket of the invention has the following advantages:
By providing a concave groove in the inner wall surface of the cylindrical center hole that communicates with the front and back sides of the socket, the lead wire connection terminal portion exposed at the bottom of the barrier fitting groove of the focus contact can be connected to the adjacent lead wire connection terminal. The creepage distances of other contacts to the ends on the front side of the socket and the terminals on the back side of the socket become longer.
At the same time, the groove becomes a ventilation path that communicates with the front and back of the socket body when attached to a cathode ray tube, making it difficult for condensation to accumulate and providing a highly reliable cathode ray tube socket that is less prone to dielectric breakdown even when the focus electrode is exposed to high voltage. It has become a thing.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of a cathode ray tube socket according to an embodiment of the present invention seen from above, Fig. 2 is a bottom view of the same, Fig. 3 is a sectional view taken along the line A--A in Fig. FIG. 5 is a partially cutaway perspective view showing creepage distance, FIG. 5 is a partially cutaway perspective view of another embodiment, FIG. 6 is an exploded perspective view of the network tube part and the cathode ray tube base, and FIG. 7 is a perspective view of an example of a conventional product. Fig. 8 is a sectional view of the used state, Fig. 9 is a partially cutaway perspective view showing the creepage distance, Figs. 10 to 12 are partially cutaway perspective views showing other conventional products, and Fig. 13 is the same. FIG. 2...focus pin, 3...other stem pin, 4...base for cathode ray tube, 5...high voltage insulation,
10...Socket body, 11...Cylindrical insulation, 12
...Focus contact accommodation hole, 13...Other contact accommodation hole, 14...Focus contact, 14a...Lead wire connection terminal, 16...Contact, 16a...Lead wire connection terminal, 18...
Barrier fitting groove, 22... recessed portion, 23... recessed groove.

Claims (1)

[Claims for Utility Model Registration] (1) The focus contact has a cylindrical center hole penetrating the front and back sides, and has a focus contact receiving hole and another contact receiving hole arranged concentrically with the cylindrical center hole. A cathode ray tube socket comprising a barrier fitting groove around the accommodation hole into which a high voltage insulating barrier for a focus contact provided on the cathode ray tube base can be freely inserted, wherein the barrier fitting groove is provided on the inner wall surface of the cylindrical center hole. A cathode ray tube socket characterized in that a groove is provided between the open part of the mating groove and the other contact receiving hole position adjacent thereto, and the groove is opened to communicate with both ends of the cylindrical center hole. (2) The cathode ray tube socket according to claim 1, wherein the groove is formed to a depth that reaches a concave portion for reducing the amount of material provided on the outside of the inner wall forming the cylindrical center hole. .