JP3444539B2 - CRT socket - Google Patents

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) used for color televisions, monitors and the like.
-Ray-Tube) structure of a CRT socket, which is particularly effective when applied to secure insulation between focusing terminals of a double focus tube.

[0002]

2. Description of the Related Art A CRT used for a color television or a display monitor has come to be widely used with widening and high definition, and various sockets for it have been proposed. However, in this double focus tube, the voltage applied to the CRT becomes higher due to the demand for wider width, digitization, etc., and the applied voltage difference between the two focusing terminals also increases. I came. However, FIG. 6 is a perspective view showing the arrangement of the focus contact holes of the conventional CRT socket of the double focus cathode ray tube, and FIG. 7 shows the first focus contact holes 107a and the second focus contact holes 107b as shown in the sectional view. The two holes are arranged next to each other, and it is difficult to separate them greatly due to a demand for a smaller CRT neck diameter and a smaller voltage application portion. The creepage distance L0 is short and surface leakage is largely prevented. It has become an issue.

[0003]

SUMMARY OF THE INVENTION According to the present invention, there is provided a CRT socket 2 for preventing surface leakage between a first focusing terminal and a second focusing terminal of a double focus tube.
An object of the present invention is to provide a CRT socket having a high creepage distance between two focus contact holes and a long creepage distance between a focus contact hole and a signal contact hole and having high insulation.

[0004]

In order to solve the above-mentioned technical problem, the invention according to claim 1 is arranged such that a cylindrical central hole penetrating through the front and back and the same outer concentric circle as the cylindrical central hole are arranged.
A ring-shaped portion provided with signal connecting means capable of engaging with the signal terminal of the RT and a high voltage connecting means capable of engaging with the focusing terminal of the CRT arranged in the same concentric circle as the signal connecting means. in CRT socket made of an insulating cover part and the base part with, its focus contact housing chamber to engage two focus terminal and the backside
A focus contact is provided in each of these parts, and a partition wall that communicates with the focus contact storage chamber from the front side and that protrudes toward the CRT side from the mating reference surface with the CRT at the top surface part of the focus contact hole that connects to the focus contact And two focusers with different applied voltage
This is to prevent surface leakage between the power terminals . Such a structure acts to increase the creepage distance between the two focus terminals and the creepage distance between the focus terminal and the signal terminal in the double focus type CRT socket, but in the single focus type CRT socket, the focus distance is increased. It acts to increase the creepage distance between the signal terminal and the signal terminal.

The invention according to claim 2 is provided with a cylindrical central hole penetrating to the front and back and signal connecting means arranged in the same outer concentric circle as the cylindrical central hole and capable of engaging with a signal terminal of a CRT. A CRT socket comprising an insulating cover part and a base part, which comprises a ring-shaped part and a high-voltage connecting means capable of engaging with a focusing terminal of a CRT arranged in the same concentric circle as the signal connecting means. A focus contact storage chamber that engages with each of the second focus terminals is individually provided on the back side, and the focus contacts are respectively disposed in this portion, and the focus terminals of the CRT are connected to the focus contacts from the front side. A convex rib is provided between the first focus contact hole and the second focus contact hole so that the applied voltage difference
The surface leak between the two focus terminals is prevented . This makes it possible to increase the creepage distance between the two focusing terminals.

[0006]

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.
A perspective view of the T-socket 1 is shown in FIG. 2, a plan view thereof, and FIG. 3 is a sectional view taken along the line aa. 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 provided with a plurality of signal contact accommodating chambers 61 concentrically outside the cylindrical central hole on the back side of the housing formed by injection molding of synthetic resin, and the signal contacts 62 made of a conductive metal plate are formed therein. Is provided, and a ground metal 63 is provided with a predetermined discharge gap with the ground metal 63 so that it is discharged to the outside when an abnormal voltage is applied.
A signal contact hole 6 for inserting and connecting the signal terminal 22 of the RT is provided, and the signal contact hole is depressed from the fitting reference surface 8 which fits with the stem base 20 of the voltage applying portion at the neck end of the CRT. The surface 9 is arranged concentrically corresponding to the signal contact storage chamber.

The insulating cover portion is made of resin so as to close the base portion in which a conductive portion such as a focus contact 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. the first and second focus contact accommodating chamber 71 is recessed in the back side of the portion arranged to focus contact 72 in this portion, first the signal contact hole substantially concentric in response to the focus contact accommodating chamber on the front side A focus contact hole 7a and a second focus contact hole 7b are provided, and a barrier wall provided on the stem base 20 is fitted around the focus contact hole to insulate the focus terminal 23 from the signal terminal. A groove 12 is provided.

Next, the structure of the focus contact hole portion, which is the main part of the present invention, will be described in detail with reference to the perspective view of FIG. 4 and the sectional view of FIG. 5b-b.
A partition wall 10a protruding toward the CRT side from a fitting reference surface that fits the stem base of the CRT neck portion around the focus contact hole 7a and the second focus contact hole 7b,
10b is provided. As a result, not only can the creepage distance between the first focus contact hole and the second focus contact hole be about twice the height of the partition wall, but also the creepage distance can be increased for the signal contact hole. Conventionally, the top surface portion 11 of the focus contact hole
0 and the top surface portion of the signal contact hole are arranged in a substantially horizontal position, but they protrude toward the CRT side from the CRT stem base fitting reference surface, so the creepage distance becomes longer and the insulation resistance becomes higher. Therefore, the present invention is effective not only for double focus tubes but also for single focus tubes.

According to the second aspect of the present invention, a rib 11 having a protruding shape is provided between the first focus contact hole and the second focus contact hole. As a result, the creepage distance can be increased as shown by L1 in FIG. 5, and surface leakage between the two focusing terminals can be prevented.

In the embodiment of the present invention shown in FIGS. 1 to 3, the ring-shaped portion is provided integrally with the base portion, but the ring-shaped portion may be provided integrally with the insulating cover portion. Good.

[0011]

According to the present invention, the creepage distance between the two focus contact holes or between the focus contact hole and the signal contact hole can be made sufficiently long, the CRT socket can be made thin, the voltage of the CRT can be increased, and two It is possible to obtain a CRT socket capable of coping with an increase in voltage difference between the focusing terminals.

[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 perspective view of an essential part of the present invention.

FIG. 5 shows a bb sectional view of the essential part of the present invention.

FIG. 6 is a perspective view of a conventional focus contact hole portion.

FIG. 7 shows a cross-sectional view of a conventional focus contact hole portion.

[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 7a 1st focus contact hole 7b Second focus contact hole 71 Focus contact storage room 72 Focus contact 8 Mating reference surface 9 Depression surface 10a, 10b Focus contact hole partition wall 11 ribs 12 groove 20 stem base 21 Printed wiring board 22 Signal terminal 23 Focusing terminal

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-274960 (JP, A) JP-A-4-206177 (JP, A) Actually open 2-49091 (JP, U) Actually open 6- 29069 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) H01R 33/74

Claims (2)

(57) [Claims] 1. A ring-shaped portion provided with a cylindrical central hole penetrating through the front and back and signal connecting means arranged in the same outer concentric circle as the cylindrical central hole and capable of engaging with a signal terminal of a CRT, CRT placed in the same concentric circle as the signal connection means
CRT comprising an insulating cover part and a base part having a high voltage connecting means capable of engaging with the focusing terminal of
In the socket, the focus contact storage chambers that engage with the two focus terminals are provided on the back side respectively, and the focus contacts are arranged in this portion, and the focus terminals of the CRT communicate with the focus contact storage chambers from the front side. CR on the top surface of the focus contact hole connected to
By providing a partition wall protruding to the T side, there are two
A CRT socket characterized by preventing surface leakage between focusing terminals . 2. A ring-shaped portion provided with a cylindrical central hole penetrating to the front and back and signal connecting means arranged in the same outer concentric circle as the cylindrical central hole and capable of engaging with a signal terminal of a CRT, and the signal. A focus for engaging two focusing terminals in a CRT socket, which is an insulating cover portion and a base portion, having a high-voltage connecting means capable of engaging with a focusing terminal of a CRT arranged in the same concentric circle as the connecting means. The contact housing is provided on the back side, and the focus contact is arranged in this portion. The focusing terminal of the CRT communicates with the focus contact housing from the front side and is connected between the two focus contact holes which are connected to the focus contact. There is a rib and there is a difference in applied voltage
A CRT socket characterized by preventing surface leakage between two focusing terminals .