JP2001111918A - Crt display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a shield structure that provides an excellent heat dissipation efficiency of the inside of a CRT display device and where a shield member is not deformed or damaged against an external shock. SOLUTION: The CRT display device of this invention is provided with a deflection coil, a CRT base, signal wires and the shield member covering anode leads, and a connection member that connects this shield member to a lag placed on a reinforcement metallic frame fitted to a panel side wall of a CRT.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

[0001] 1. Field of the Invention [0002] The present invention relates to a CRT display device.

[0002]

2. Description of the Related Art A high-frequency (several MHz to several tens of MHz) pulse signal is input from a computer or the like via a cable to a CRT display device, amplified by a video circuit, and transmitted to a CRT cathode via a signal line. The emission of unnecessary electromagnetic waves is remarkable and adversely affects the operation of computers and other electronic devices. Various regulations have been made to prevent the adverse effects of these unnecessary electromagnetic radiations, and the TCO standards (TCO95, 99) introduced in Europe and other countries also have provisions for the amount of alternating electric field radiation. Therefore, a shield structure for preventing unnecessary radiation of a CRT display device must satisfy these regulations.

FIG. 6 shows an example of a conventional shield structure of a CRT display device.
No. 0 publication. In the figure, 1 is a CRT, 5
Is a shield case of the CRT 1, 14 is a video board for generating a video signal, 17 is a neck portion of the CRT 1, and 18 is a shield fitting for a video board. In the figure, a video board 14 and a neck portion 17 are integrally connected without intervening a signal line, and the video board 14 is screwed through a shock absorber 19 of good conductivity together with a video display board shield fitting 18. To the shield case 5.

In this manner, the video board 14 is
The CRT 1 is integrally connected to the first neck portion 17 and is fixed to the shield case 19 via the shock absorber 19 having good conductivity, thereby covering the CRT 1 without applying stress to the neck portion 17 against external impact. A shield structure is established.

[0005]

The conventional shield structure of a CRT display device has a problem in that the entire inside of the CRT display device is covered with a shield case 5, which leads to an increase in the temperature inside the CRT display device. In addition, a shield structure that covers the entire inside of a CRT display device shields unnecessary portions, and requires a large-area shield component.
This has resulted in increased cost and weight of parts.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and has excellent heat dissipation efficiency inside a CRT display device, and does not deform or break a shield member against an external impact. The purpose is to obtain a shield structure.

[0007]

A CRT display device according to the present invention comprises a CRT, a deflection coil of the CRT, and a CR.
A CRT substrate having a socket connected to the neck of a T, a signal line for transmitting a video signal to the CRT substrate, and a CRT display device having an anode lead, provided with a deflection coil and a shield member that covers only the CRT substrate. is there. A CRT display device according to the present invention is a CRT having a CRT, a deflection coil of the CRT, and a socket connected to a neck portion of the CRT.
In a CRT display device having a substrate, a signal line for transmitting a video signal to the CRT substrate, and an anode lead, a shield member for covering only the deflection coil, the CRT substrate, the signal line, and the anode lead is provided. In the above-described CRT display device, a connecting member for connecting a lug provided on a reinforcing metal frame attached to a side wall portion of the CRT to a shield member is provided. In the CRT display device according to the present invention, the connecting member is a pair of conductive members arranged substantially symmetrically with respect to the CRT tube axis. The connecting member is a plate-shaped conductive member having an opening. The connecting member is a conductive elastic member. The shield member is provided with a conductive leaf spring which is formed in the funnel portion of the CRT and is in contact with the film-shaped conductor connected to the ground.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 FIG. 1 is an assembly configuration diagram showing an outline of the configuration of a CRT display device according to Embodiment 1 of the present invention. In the figure, reference numeral 9 denotes a conductor coated on the funnel portion of the CRT 1 and is connected to the ground (hereinafter, referred to as a coating ground).
Reference numeral 21 denotes an anode lead of the CRT 1. Reference numeral 26 denotes a reinforcing metal frame to which lugs 2 for attaching the CRT 1 to the front member 4 are fixed at four corners. The coating earth 9 and the reinforcing metal frame 26 are made of a conductive member 2 such as aluminum tape.
5 are conductively connected. Reference numeral 23 denotes a deflection coil, and a rear neck portion 17 is connected to a CRT substrate 13 on which a socket for supplying a video signal to the CRT 1 is mounted. The outside of the CRT board 13 is covered with the shield case 7, and a signal line 22 for transmitting a video signal generated on the video board 14 to the CRT board 13 is connected. The video board 14 is covered with a shield case 16, which is fixed to a sheet metal frame 8 attached to the main board 12. Plate springs 32 and 33 having conductivity are fixed to both front side surfaces of the sheet metal frame 8 and come into contact with the coating ground 9.

In the CRT 1 configured as described above, unnecessary radiation of electromagnetic waves is large, and particularly, the anode lead 21, the deflection coil 23, the CRT substrate 13, and the signal line 22 need to be shielded. Therefore, a shield structure that effectively reduces the radiation of electromagnetic waves from the CRT 1 can be obtained by partially shielding them and conducting conductive connection with other conductive parts.

Hereinafter, a method of shielding these portions will be described. Deflection coil 23 and anode lead 2
1 is shielded by a first shield member 27, and the CRT substrate 13 and the signal line 22 are shielded by a second shield member 28, respectively. The first shield member 27 includes screws 301,
The lug 2 is connected to the lug 2 by screws 304 and 305 via a plate-shaped conductive member 24 having a heat-dissipating opening 24a attached by 302. In the present embodiment, since the anode lead passes through the right side of the funnel portion of the CRT 1, the right side portion of the first shield member 27 is formed wide.
The second shield member 28 is fixed to the video board 1 by screws 306.
4 is fixed to the shield case 6. The first shield member 27 and the second shield member 28 are connected by a screw 303. The first shield member 27 has conductivity,
The leaf springs 30 and 31 each having an end portion formed in a strip shape are fixed together with the plate-shaped conductive member 24.
0, 31 contact the coating ground 9 of the CRT 1. A conductive leaf spring 29 that is in contact with the shield case 7 of the CRT substrate is fixed inside the second shield member 28.

Thus, the first shield member 27,
The second shield member 28, the plate-shaped conductive member 24, the lug 2, the reinforcing metal frame material 26, the video board shield case 6, the sheet metal frame 8 and the coating ground 9 are electrically conductively connected to each other, and a shield is particularly required. CRT1 deflection coil 23, anode lead 21, signal line 22, CR
A shield structure that covers the T substrate 13 is established.

In the present embodiment, the CRT substrate 13 is doubly shielded by the shield case 7 and the second shield member 28. However, if the double shield is not particularly required, the shield case 7 of the CRT substrate 13 is used. The leaf spring 29 fixed to the second shield member 28 may be omitted. Further, the plate-shaped conductive member 24 is formed of a metal component, a non-conductive component plated, a conductive coating, or the like.

Embodiment 2 FIG. FIG. 2 shows Embodiment 2 of the present invention.
1 is an assembly configuration diagram showing a configuration of a CRT display device according to the present invention. In the figure, reference numerals 37 and 38 denote a pair of conductive connecting members for connecting the first shield member 27 to the lug portion 2 and electrically conductively connecting the first shield member 27 to the lug portion 2. It is fixed to the first shield member 27 by 301 and 302. Conductive connecting member 37,
38 is disposed symmetrically with respect to the tube axis of the CRT 1, so that the first shield member 27 receives even force and tends to stop at a stable position even when an external impact or the like is received. Therefore, the plate springs 30 and 31 fixed to the shield member 27 can be stably brought into contact with the coating ground portion 9.

As shown in FIG. 2, the conductive connecting members 37, 3
By forming the member 8 with the members having the openings 37a and 38a, it is possible to reduce the weight of the parts and improve the heat radiation efficiency. The conductive connecting members 37 and 38 can be made of a metal-based component, a non-conductive component plated or a conductive coating. A plurality of conductive holding members may be arranged evenly on the left and right with the tube axis of the CRT 1.

Embodiment 3 FIG. 3 is an assembly configuration diagram showing an outline of the configuration of a CRT display device according to Embodiment 3 of the present invention. In the figure, reference numeral 27 'denotes a first shield member that covers a part of the deflection coil 23 and the anode lead 21 of the CRT 1. The first shield member 27 'has a screw 3
Extension 39 fixed to lug 2 by 09, 310
a, 39b are formed, and the first shield member 39 is connected to the lug portion 2 and electrically connected. As described above, the means for electrically connecting the first shield member 27 'to the lug portion 2 may be integrally formed.

Embodiment 4 FIG. 4 is a configuration diagram showing a configuration of a CRT display device according to Embodiment 4 of the present invention. In the figure, 40 and 41 are the first shield members 2
7 is connected to the lug 2 and is a pair of conductive elastic members that are conductively connected.
The other end is fixed to the first shield member 27 together with the leaf springs 30 and 31 by screws 313 and 314.

When the CRT 1 receives vibrations or shocks from the outside, the conductive elastic members 40 and 41 absorb the shocks by expanding and contracting vertically and horizontally. This makes it difficult for the first shield member 27 and the second shield member 28 fixedly connected thereto to be deformed or damaged. The conductive elastic members 40 and 41 are made of conductive parts such as a metal spring and a conductive rubber cord made of a metal fiber.

In this embodiment, the CRT lug 2 and the first
Are directly connected by the conductive elastic members 40 and 41 between the CRT lug portion 2 and the conductive elastic members 40 and 41, and between the first shield member 27 and the conductive elastic member. Another conductive component may be interposed between 40 and 41.

In the first to fourth embodiments of the present invention, the first shield member 27 and the second shield member 28 may be constituted by the same member, and the deflection coil 23 of the CRT 1, a part of the anode lead 21, An integrated shield member 200 or 2 covering the CRT substrate 13 and the signal line 22
It may be 00 '. In some cases, unnecessary radiation can be reduced to a standard level by shielding one of the deflection coil 23 and the anode lead 21 or one of the CRT substrate 13 and the signal line 22. In addition, the leaf spring 3 in contact with the coating ground 9
0 and 31 may be fixed to the first shield member in advance.

[0020]

According to the CRT display device of the present invention, heat radiation of the CRT display device is achieved by partially shielding parts (deflection coils, anode leads, CRT substrates and signal lines) that need to be shielded. The efficiency can be improved, the material cost of the shield member can be reduced, and the cost can be reduced. Further, by providing a leaf spring in contact with the coating ground provided on the funnel portion of the CRT on the shield member, the ground potential of the shield member can be stabilized.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a configuration of a CRT display device according to a first embodiment.

FIG. 2 is a configuration diagram showing a configuration of a CRT display device according to a second embodiment.

FIG. 3 is a configuration diagram showing a configuration of a CRT display device according to a third embodiment.

FIG. 4 is a configuration diagram showing a configuration of a CRT display device according to a fourth embodiment.

FIG. 5 is a configuration diagram illustrating an example of a conventional CRT display device.

[Explanation of symbols]

1 CRT, 2 lugs, 4 front members, 5 shield cover, 6 video board shield case, 7 CRT board shield case, 8 sheet metal frame, 9 CRT coating ground, 10 leaf spring, 11 ground lead, 12 main board, 13 CRT board, 14 Video board, 17 Neck, 18 Shield, 19
Shock absorber, 20 screws, 21 anode lead, 2
2 signal line, 23 CRT deflection coil, 24 plate-shaped conductive member, 24a opening, 25 conductive member, 26 reinforcing metal frame, 27, 27 'first shield member, 28 second
Shield members, 29 to 33 leaf springs, 37, 38 conductive connecting members, 40, 41 conductive elastic members, 200,
200 'integrated shield member, 301-314 screws.

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Hideaki Kikuchi, Inventor 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsui Electric Co., Ltd. (72) Inventor Takumi Takashima 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Rishi Electric Co., Ltd.

Claims (7)

[Claims] 1. A CRT having a CRT, a deflection coil of the CRT, and a socket connected to a neck of the CRT.
A CRT display device comprising a substrate, a signal line for transmitting a video signal to the CRT substrate, and an anode lead, wherein a CRT display device is provided with a shield member that covers only the deflection coil and the CRT substrate. 2. A CRT having a CRT, a deflection coil of the CRT, and a socket connected to a neck of the CRT.
In a CRT display device having a substrate, a signal line for transmitting a video signal to the CRT substrate, and an anode lead, a shield member that covers only the deflection coil, the CRT substrate, the signal line, and the anode lead is provided. Characteristic CRT display device. 3. The CRT display device according to claim 1, further comprising a connecting member for connecting a lug provided on a reinforcing metal frame attached to a side wall of the CRT to a shield member. CRT display device. 4. The CRT display device according to claim 3, wherein the connecting member is a pair of conductive members disposed substantially symmetrically with respect to the CRT tube axis. 5. The CRT display device according to claim 3, wherein the connecting member is a plate-shaped conductive member having an opening. 6. The CRT display device according to claim 3, wherein the connecting member is a conductive elastic member. 7. A CRT according to claim 1,
A CRT display device, comprising: a film-shaped conductor formed in a funnel portion of a CRT and connected to the ground; and a shield member provided with a conductive leaf spring in contact with the film-shaped conductor. .