JP2002008811A - Crt socket - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for a CRT socket with high insulation preventing surface leaks and capable of sufficiently coping with thickness reduction of the CRT socket and enhancement of a focus impressed voltage. SOLUTION: This CRT socket for a color television or the like comprises a cylindrical center hole penetrating from front to back, a ring-like part arranged coaxially outside the cylindrical center hole and provided with a plurality of signal contact housing chambers recessed in a back side for arranging signal contents inside each one and signal contact holes arranged in a front side for allowing low voltage signal terminals of a CRT to communicate with the signal contact housing chambers and connecting them to the signal contacts, and a cover part provided with focus contact housing chambers recessed in a back side of arranging focus contacts inside them and focus contact holes arranged coaxially with the signal contact holes in a front side for communicating high voltage focus terminals of the CRT and connecting them to the focus contacts. Ribs protruding toward a CRT side with respect to an engagement reference plane with the CRT are provided between the signal contact holes and the focus contact holes.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a CRT (between cathode lines; Cathode
More specifically, the present invention relates to a CRT socket having a high insulation property that prevents surface leakage between a high-voltage focus terminal and a low-voltage signal terminal.

[0002]

2. Description of the Related Art A conventional CRT socket, for example, as shown in FIG. 5, has a cylindrical central hole 105 penetrating from the front to the back and a depressed surface concentrically depressed on the outer side thereof in a top surface portion engaging with the CRT. The signal contact recess 109 and a plurality of signal contact holes 1 provided at predetermined intervals in the recessed surface.
6, a focus contact concave portion 110 having a depressed surface formed by depressing a top surface portion engaging with the CRT, and an insulating cover portion 103 including a focus contact hole 107 provided in the depressed surface. The recessed periphery becomes a wall, and the creepage distance between the high-voltage focus terminal and the low-voltage signal terminal can be increased. However, a thin CRT socket is required due to a demand for a thin TV set or the like. For example, as shown in FIG.
When a part of the barrier 13 of the stem base 20 at the tip of the neck portion is cut out and the CRT socket is made thin to shorten the distance between the CRT and the printed wiring board, a low-voltage signal adjacent to the focus terminal to which a high voltage is applied is applied. Insulation distance from the terminal is shortened. On the other hand, as the performance of television sets and the like is required to be higher, the focus application voltage tends to further increase. Therefore, only the wall provided with a depressed surface on the top surface of the socket that engages with the CRT as in the prior art alone has the upper end of the wall around the high voltage focus contact hole and the upper end of the wall around the low voltage signal contact hole. Is located in a substantially horizontal position, so that the insulating properties have become insufficient.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a structure of a CRT socket having a high insulation property and capable of sufficiently reducing the thickness of the CRT socket and sufficiently coping with an increase in the voltage applied to the focus and preventing surface leakage.

[0004]

In order to solve the above-mentioned problems, a CRT socket according to the present invention is arranged in a cylindrical central hole penetrating from the front to the back and in the same outer concentric circle as the cylindrical central hole, and a plurality of holes are provided on the rear side. A signal contact storage chamber is recessed, and signal contacts are respectively disposed therein. A signal contact hole is provided on the front side for connecting a signal terminal for low voltage of the CRT to the signal contact storage chamber and connecting to the signal contact. A focus contact storage chamber is recessed on the back side and a focus contact is provided therein, and a focus contact hole through which a high-voltage focus terminal of a CRT communicates and connects to the focus contact is provided on the front side. In a CRT socket comprising a cover portion and a base portion arranged concentrically with the signal contact hole, the signal contact hole and the CRT between Kas contact holes
And a rib protruding toward the CRT side with respect to the fitting reference surface.

[0005] Further, the outer end of the rib between the focus contact hole and the signal contact hole has a substantially L-shaped rib shape extending in the outer circumferential direction of the signal contact hole in a direction opposite to the focus contact hole. Thereby, the creepage distance in the lateral direction of the rib can be made longer than the creepage distance exceeding the height direction of the rib, and as a result, the creepage distance can be made longer as shown in FIG.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a CR according to the present invention.
FIG. 2 is a perspective view of the T socket 1, FIG. 2 is a plan view, and FIG. The CRT socket according to the present invention includes a ring portion 2, an insulating cover portion 3, a base portion 4, and a cylindrical center hole 5. The ring-shaped portion has a plurality of signal contact storage chambers 61 concentrically recessed outside the cylindrical center hole on the back side of a housing formed by injection molding of a synthetic resin, in which contacts 62 of a conductive metal plate are formed. A ground metal 63 is provided with a predetermined discharge gap with the ground metal 63 so that when an abnormal voltage is applied, the ground metal 63 is discharged to the outside.
A signal contact hole 6 for inserting and connecting a signal terminal of the CRT is provided. The signal contact hole is a recessed surface 9 which is recessed from a fitting reference surface 8 which is fitted to a stem base 20 of a voltage application portion at a neck portion of a CRT. Are arranged concentrically in correspondence with the signal contact storage chamber.

The insulating cover portion is formed of resin so as to cover a base portion in which a conductive portion such as a focus contact 72 to which a high voltage of several thousand volts is applied is accommodated, and corresponds to a ring-shaped portion of the insulating cover portion. The focus contact storage chamber 71 is recessed on the back side of the part to be formed, the focus contact is provided in this part, and the focus contact hole 7 is provided on the front side substantially concentrically with the signal contact hole corresponding to the focus contact storage chamber, Further, a barrier wall 1 provided on the stem base 20 is provided around the focus contact hole.
3 is provided with a groove 12 for insulating the focus terminal 23 and the signal terminal 22 from each other.

A rib 11 is provided between the signal contact hole and the focus contact hole so as to protrude toward the CRT from the reference surface 8 for fitting the CRT. At this time, the tip outside the cylindrical center hole of the rib is extended so as to surround the signal contact hole in the circumferential direction of the ring-shaped portion (the outer circumferential direction of the signal contact hole) in the direction opposite to the focus contact hole. It was formed in a substantially L-shape. As a result, the creepage distance becomes longer as shown in FIG. Here, the L-shaped rib is formed because the creepage distance in the lateral direction of the rib may be shorter than the creepage distance in the height direction of the rib. That is, if the height of the rib is increased, the length of the rib in the circumferential direction must be increased in order to increase the creepage distance in the lateral direction of the rib.

In the embodiment of the present invention shown in FIGS. 1 to 3, the case where the ring-shaped portion is provided integrally with the base portion is shown. Good.

[0010]

According to the present invention, the creepage distance between the focus contact hole into which the high voltage focus terminal is inserted and connected and the signal contact hole into which the low voltage signal terminal is inserted and connected is determined by the height of the rib. CRT as it gets longer
Since it protrudes from the fitting reference surface to the CRT side, the creepage distance can be lengthened accordingly. This allows CRT
CR that can respond to thinner sockets and higher voltage CRTs
A T socket is obtained.

[Brief description of the drawings]

FIG. 1 shows a perspective view of a CRT socket 1 according to an embodiment of the present invention.

FIG. 2 shows a plan view of the CRT socket 1. FIG.

FIG. 3 is a sectional view of the CRT socket 1 taken along the line aa.

FIG. 4 is a perspective view of a neck portion tip voltage application portion of the CRT.

FIG. 5 shows a perspective view of a CRT socket according to the prior art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 CRT socket 2 Ring part 3 Insulating cover part 4 Base part 5 Cylindrical center hole 6 Signal contact hole 61 Signal contact storage room 62 Signal contact 63 Grounding metal 7 Focus contact hole 71 Focus contact storage room 72 Focus contact 8 Fitting Reference surface 9 Depressed surface 11 Rib 12 Groove 13 Stem base barrier wall 20 Stem base 21 Printed wiring board 22 Signal terminal 23 Focusing terminal

Claims (2)

[Claims] 1. A cylindrical central hole penetrating on the front and back sides and an outer concentric circle with the cylindrical central hole, and a plurality of signal contact storage chambers are recessed on the back side, and signal contacts are respectively disposed therein. On the front side, a signal terminal of the CRT communicates with the signal contact storage chamber, and a ring-shaped portion in which a signal contact hole for connecting to the signal contact is provided. A CRT focus terminal is provided on the front side, and a focus contact hole connected to the focus contact is connected to the signal contact hole in a CRT socket including a cover portion and a base portion which are arranged concentrically with the signal contact hole. C between focus contact holes
A CRT socket, characterized in that a rib protruding toward the CRT side with respect to a mating reference surface with the RT is provided. 2. The CRT socket according to claim 1, wherein the rib has a substantially L-shaped rib extending outside the signal contact hole in a circumferential direction in a direction opposite to the focus contact hole.