JP3445222B2 - CRT socket - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention CRT (cathode ray tube used in a color television or a monitor or the like; Cathode
The present invention relates to a structure of a CRT socket for connecting a -Ray-Tube), and particularly to a CRT socket having a high insulating property which prevents surface leakage between a focus terminal having a high voltage and a signal terminal having a low voltage.

[0002]

2. Description of the Related Art A conventional CRT socket 101 has, for example, a cylindrical center hole 105 penetrating through the front and back as shown in FIG. 7, and concentrically formed on the outside thereof is a focus terminal for high voltage of a CRT. Focus contact hole 10
7 and a signal contact hole 106 into which a signal terminal having a low voltage is inserted and connected, and a fitting groove 112 into which the stem base barrier wall of the voltage application portion at the tip of the CRT neck is fitted is provided around the focus contact hole. The structure is such that the through groove 113 is provided in the ring-shaped portion between the focus contact hole and the signal contact hole, and the insulating property between them is secured.

However, in order to reduce the thickness of the CRT socket, a structure in which a part of the barrier wall 13 of the stem base 20 at the tip of the CRT neck portion connected to the CRT socket is cut out is adopted as shown in FIG. And Figure 8 Path (c)
As shown in, the creepage distance between the focus contact hole and the signal contact hole became insufficient. On the other hand, as shown in FIG. 9, in the structure in which a part of the front surface side of the ring-shaped portion between the focus contact hole and the signal contact hole of the CRT socket is cut out, not only the path (d) but also the path on the back surface side ( E) The creepage distance is insufficient.

[0004]

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, which is capable of sufficiently reducing the thickness of the CRT socket and increasing the focus applied voltage, and which prevents surface leakage.

[0005]

In order to solve the above-mentioned problems, the invention according to claim 1 arranges a cylindrical central hole penetrating through the front and back and the same outer concentric circle as the cylindrical central hole, and a plurality of them on the back side. The signal contact storage chamber is formed as a recess, and the signal contacts are arranged in the recesses, and a signal contact hole for connecting the signal terminal of the CRT to the signal contact storage chamber and connecting to the signal contact is provided on the front side. A focus contact storage chamber is provided in a concave portion on the back side and the focus contact is arranged in the recess, and a focus contact hole for connecting the focus terminal of the CRT to the focus contact on the front side is concentric with the signal contact hole. CRT consisting of a cover and a base mounted on the
In the socket, C connected to the CRT socket
It is provided on the stem base provided at the tip of the RT neck .
A part of the outer peripheral side of the focus terminal barrier is cut out, and a groove portion that fits with the focus terminal barrier of the stem base is formed in the CRT socket, and a ring-shaped portion between the focus contact hole and the signal contact hole is formed. By providing a recessed portion so that the front surface side or the back surface side has a concave shape, surface leakage from a partial cutout portion on the outer peripheral side of the focus terminal barrier of the stem base was prevented.

According to the second aspect of the present invention, a cylindrical central hole penetrating through the front and back sides and an outer concentric circle which is the same as the cylindrical central hole are arranged, and a plurality of signal contact storage chambers are provided in the rear side, and the signal contact storage chambers are respectively formed therein. Contact is arranged, CRT on the front side
The ring-shaped part in which the signal terminal communicates with the signal contact storage chamber and is provided with a signal contact hole for connecting to the signal contact, and the focus contact storage chamber is recessed on the back side, and the focus contact is disposed therein. , C on the front
In a CRT socket including a cover portion and a base portion in which a focus contact hole of an RT for communicating with and connecting to a focus contact is arranged concentrically with the signal contact hole, a CRT socket connected to the CRT socket is provided. Stem base provided at the tip of the neck
A part of the outer circumference side of the focus terminal barrier provided on the CRT socket is cut out, and the CRT socket has a front side concave shape and a back side concave shape in the ring-shaped portion between the stem tact hole and the signal contact hole. By forming a recessed portion as described above, surface leakage from a partially cutout portion on the outer peripheral side of the focus terminal barrier of the stem base was prevented.

According to a third aspect of the invention, a through groove is provided between the focus contact hole and the signal contact hole beside the concave contact hole of the first or second aspect. As a result, the route shown in Fig. 2 (a)
It is possible to sufficiently secure the creepage distance on the front surface side as shown in FIG. 4 and the creepage distance on the back surface side as shown in the route (b) in FIG.

[0008]

DETAILED 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, FIG. 3 is a sectional view taken along line aa, and FIG. The CRT socket according to the present invention comprises a ring-shaped portion 2, an insulating cover portion 3, a base portion 4 and a cylindrical central hole 5. The ring-shaped portion is formed by injection molding synthetic resin on the back side of the housing, and a plurality of signal contact storage chambers 61 are formed concentrically outside the cylindrical central hole.
Is provided with a contact 62 made of a conductive metal plate, and a ground metal 63 is provided with a predetermined discharge gap between the contact 62 and the contact 62. The contact 62 is discharged to the outside when an abnormal voltage is applied. It has a structure, and a signal contact hole 6 for inserting and connecting a signal terminal of a CRT to this signal contact is provided on the front side, and the signal contact hole is CR.
Corresponding to the signal contact accommodating chamber, they are concentrically arranged on a recessed surface 9 recessed from the fitting reference surface 8 that fits with the stem base 20 at the voltage application portion of the neck portion of T.

The insulating cover portion is made of resin so as to close the base portion in which the conductive portion such as the focus contact 72 to which a high voltage of several thousand volts is applied is closed, and corresponds to the ring-shaped portion of the insulating cover portion. A focus contact storage chamber 71 is recessed on the back side of the portion to be formed, and a focus contact 72 is disposed on this portion, and a focus contact hole 7 is provided on the front side in a substantially concentric pattern with the signal contact hole corresponding to the focus contact storage chamber. Further, around the focus contact hole, there is provided a through groove portion 12 for fitting a barrier wall provided on the stem base to insulate the focus terminal 23 and the signal terminal 22 from each other.

A surface cutout portion 11a is formed in a ring-shaped portion between a focus contact hole into which a focus terminal having a high voltage of several thousand volts of a CRT is inserted and connected and a signal contact hole into which a signal terminal having a low voltage is inserted and connected. Alternatively, the back surface undercut portion 11b is provided, or the front surface undercut portion 11a and the back surface undercut portion 11b are provided at the same time (see FIG. 5). As a result, the length of the creepage distance on the front surface side as shown in the route (a) of FIG. 2 and the length of the creepage distance on the rear surface side as shown in the route (b) of FIG. 4 can be sufficiently obtained. Further, the creepage distance between the focus contact hole and the signal contact hole can be increased by using a through groove that penetrates the front surface side recess and the back surface side recess provided in the ring-shaped portion.

[0011]

According to the present invention, the creepage distance can be sufficiently obtained by the recesses on the front surface side, the back surface side, or both surfaces between the focus contact hole and the signal contact hole, and the barrier wall of the stem base fits. By making the portion a through groove, it is possible to secure a longer creepage distance. These make the CRT socket thinner and CRT
It is possible to obtain a CRT socket that can handle higher voltage.

[Brief description of 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 a CRT socket 1.

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

FIG. 4 shows a rear view of the CRT socket 1.

5 shows a bb sectional view of the CRT socket 1. FIG.

FIG. 6 is a perspective view of a CRT neck tip voltage application portion.

FIG. 7 shows a perspective view of a conventional CRT socket 101.

FIG. 8 shows an enlarged cross-sectional view of a through groove portion of the CRT socket 101.

FIG. 9 shows a cross-sectional view between a focus contact hole and a signal contact hole of another conventional CRT socket.

[Explanation of symbols]

1 CRT socket 2 ring-shaped part 3 Insulation cover 4 base part 5 Cylindrical center hole 6 Signal contact hole 61 Signal contact storage room 62 Signal contact 63 Ground bracket 7 Focus contact hole 71 Focus contact storage room 72 Focus contact 8 Mating reference surface 9 Depression surface 11a Surface lacking part 11b Back surface lacking part 12 Through groove 13 Stem base barrier wall 20 stem base 21 Printed wiring board 22 Signal terminal 23 Focusing terminal

─────────────────────────────────────────────────── ─── Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) H01R 33/945

Claims (3)

(57) [Claims] 1. A cylindrical central hole penetrating to the front and back and an outer concentric circle which is the same as the cylindrical central hole, and a plurality of signal contact accommodating chambers are recessed on the back side, and signal contacts are respectively arranged therein. On the front side, a ring-shaped portion in which a signal terminal of a CRT communicates with the signal contact storage chamber and a signal contact hole for connecting to the signal contact is provided, and on the back side, a focus contact storage chamber is provided. A CRT socket that is provided and has a focus contact hole for communicating with a focus contact of a CRT on the front side and connected to a focus contact in a concentric circle with the signal contact hole. the outer periphery of the focus terminal barrier provided on the stem base provided in the CRT neck portion distal end that is connected to Part of is cut out, the CRT
A groove portion that fits with the focus terminal barrier of the stem base is formed in the socket, and a ring-shaped portion between the focus contact hole and the signal contact hole is provided with a recessed portion so that the front surface side or the back surface side becomes a concave shape, A CR characterized in that surface leakage from a part of the cutout portion on the outer peripheral side of the focus terminal barrier of the stem base is prevented.
T socket. 2. A cylindrical central hole penetrating to the front and back and an outer concentric circle which is the same as the cylindrical central hole, and a plurality of signal contact accommodating chambers are recessed in the rear side, and signal contacts are respectively arranged therein. On the front side, a ring-shaped portion in which a signal terminal of a CRT communicates with the signal contact storage chamber and a signal contact hole for connecting to the signal contact is provided, and on the back side, a focus contact storage chamber is provided. A CRT socket that is provided and has a focus contact hole for communicating with a focus contact of a CRT on the front side and connected to a focus contact in a concentric circle with the signal contact hole. the outer periphery of the focus terminal barrier provided on the stem base provided in the CRT neck portion distal end that is connected to Part of is cut out, the CRT
A groove is formed in the socket so as to fit with the focus terminal barrier of the stem base, and a recess is formed in the ring-shaped portion between the focus contact hole and the signal contact hole so as to have a front-side concave shape and a back-side concave shape. And surface leakage from a partial cutout portion on the outer peripheral side of the focus terminal barrier of the stem base is prevented.
RT socket. 3. The CRT socket according to claim 1, wherein a through groove is provided on the focus contact hole side between the focus contact hole and the signal contact hole.