JPH1125875A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the generation of unwanted discharges when high voltage is applied and enhance voltage resistant characteristic in a color cathode-ray tube, containing an inside magnetic shield. SOLUTION: In order to fix an inside magnetic shield 29 to a color-selecting mechanism 26 of a color cathode-ray tube, a fixing piece 29b is formed in the front opening part of the inside magnetic shield 29, and through-holes 31, 32 are formed in a frame 24 of the color-selecting mechanism 26 with which the fixing piece 29b is brought into contact, the through-holes 31, 32 are communicated, a locking member 30 is inserted into the through-holes 31, 31, and the fixing piece 29b is interposed between the frame 24 and the locking member 30 for holding pinchedly. Thereby, the inside magnetic shield 29 is fixed to the color- selecting mechanism 26.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube having an internal magnetic shield inside.

[0002]

2. Description of the Related Art In a color cathode-ray tube in which a frame is provided with a color selection electrode formed by stretching a color selection electrode thin plate and a phosphor coated on a panel is emitted by three electron beams, an aperture which is a color selection mechanism is provided. The three electron beams corresponding to the three primary colors that have passed through the grille must strike predetermined phosphors located at predetermined positions on a fluorescent screen formed on the inner surface of the panel of the color cathode ray tube, facing the aperture grille, and emit light. Must.

However, when the trajectory of the electron beam changes due to the influence of an external magnetic field such as terrestrial magnetism, the electron beam cannot reach a predetermined position on the phosphor screen. There are problems such as color shift.

As a means for solving such a problem, there is a color cathode ray tube in which an internal magnetic shield member is provided in the inside thereof so as to eliminate the influence of an external magnetic field.

That is, a conventional color cathode ray tube in which an internal magnetic shield member is disposed is configured as shown in FIGS.

FIG. 4 is an exploded view of a conventional color cathode ray tube. This color cathode ray tube 1 has a glass bubble panel 2 and a funnel 3 and a frame 4 on which a color selecting electrode thin plate 5 is stretched. An aperture grill as a color selection mechanism 6 formed by the above, an electron gun 7 built in a neck portion 3a connected to the funnel 3, and an inner surface of the panel 2, that is, an inner surface of the face portion 2a. It comprises a red, green, and blue (R, G, B) fluorescent screen 8. An internal magnetic shield 9 as an internal magnetic shield member is disposed inside the color cathode ray tube 1.

The internal magnetic shield 9 has a truncated pyramid shape following the inner peripheral portion of the funnel 3, and has a front opening 9 a having a size corresponding to the frame 4 of the color selection mechanism 6. A fixing piece 9b is formed to protrude from the long side edge of the mouth 9a. As shown in FIG. 5, the internal magnetic shield 9 is fixed to the frame 4 of the color selection mechanism 6 by abutting the fixed piece 9b against the outer surface of the frame 4 and performing spot welding S.

[0008] The color selection mechanism 6 with the internal magnetic shield 9 fixed as described above, the hole 10a of the plate-like spring 10 fixed to the frame 4 is formed on the inner surface side of the panel 2 by the skirt portion 2a on the side surface of the panel 2. By being inserted and engaged with the pin 11 fixed to the inner surface, it is supported and opposed to the fluorescent screen 8 on the inner surface of the face portion 2 a of the panel 2.

As described above, the color selection mechanism 6 of the color cathode ray tube 1 is magnetically shielded mainly by covering the long side of the frame 4 with the internal magnetic shield 9, thereby eliminating or reducing the influence of the external magnetic field. ing.

Further, in the color cathode ray tube, in order to reduce the influence of an external magnetic field, in addition to the first internal magnetic shield along the inner peripheral surface of the funnel, the first internal shield from the front side of the frame of the color selection mechanism. A color cathode ray tube has been proposed in which a second internal magnetic shield is provided on the inner surface side of the panel so as to surround the outside of a portion leading to a connection portion with the magnetic shield, so as to perform double internal magnetic shield. (Japanese Patent Laid-Open No. 4-3)
No. 57651).

[0011]

As described above, in the color cathode ray tube, in order to reduce the influence of the external magnetic field, the method of magnetically shielding the color selection mechanism by the double internal magnetic shields requires an additional member. However, since the configuration becomes complicated and there is a problem in the internal space, the configuration in which the long side of the frame of the color selection mechanism is covered by the internal magnetic shield as in the color cathode ray tube shown in FIGS. The magnetic shield system is common.

The color cathode ray tube 1 shown in FIGS.
In order to fix the internal magnetic shield 9 to the color selection mechanism 6 as described above, the fixing piece 9b projecting from the internal magnetic shield 9 is spot-welded to the frame 4 of the color selection mechanism 6. However, the plate thickness of the internal magnetic shield 9 is usually 0.1 mm.
Since the thickness is as thin as 1 to 0.3 mm, welding spatter, burrs, and the like easily occur during welding. Since the inside of the color cathode ray tube 1 is in a state of being applied with a high voltage (20 to 30 KV) during operation, if a welding splash, a burr or the like is generated inside the tube, it causes a discharge at the time of operation, and the pressure resistance of the color cathode ray tube 1 There is a problem that the quality may be deteriorated.

The present invention has been made in view of the above points, and eliminates the occurrence of welding splash, burrs, and the like when the internal magnetic shield is fixed to the frame of the color selection mechanism, thereby preventing discharge during operation. An object of the present invention is to provide a color cathode ray tube capable of improving pressure resistance quality.

[0014]

In order to achieve the above object, the present invention provides a color cathode ray tube having a color selection mechanism formed by stretching a color selection electrode thin plate on a frame and an internal magnetic shield. The internal magnetic shield is fixed to a frame of the color selection mechanism by a fastening member.

Further, according to the present invention, in the above structure, through holes are provided corresponding to each other at portions where the frame and the internal magnetic shield overlap with each other, and a fastening member is used in the through holes to attach the frame to the frame. It is constructed by fixing an internal magnetic shield.

Further, according to the present invention, in the above-mentioned structure, a fastening member having elasticity which is communicated with the frame and the through hole provided in the internal magnetic shield is inserted and elastically engaged, The internal magnetic shield is fixed to the frame.

In the color cathode ray tube according to the present invention having the above-described structure, welding splash, burr, etc. do not occur in fixing the internal magnetic shield to the frame of the color selection mechanism, discharge during operation is prevented, and pressure resistance is reduced. Quality is improved.

[0018]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to FIG.

In this embodiment, a color cathode ray tube according to the present invention is fixed to a frame of a color selection mechanism without welding an internal magnetic shield.

FIG. 1 is a partially cutaway plan view of an example of a color cathode ray tube according to the present invention.
Indicates the entire color cathode ray tube.

This color cathode ray tube 21 is also described in FIG.
As in the conventional color cathode ray tube 1 shown in FIG. 1, a color selection mechanism 2 formed by extending a glass bubble panel 22 and a funnel 23 and a color selection electrode thin plate 25 on a frame 24.
An aperture grille 6 and an electron gun 27 built in a neck 23a connected to the funnel 23;
It is composed of a red, green, and blue (R, G, B) fluorescent screen 28 formed on the inner surface of the panel 22, that is, the inner surface of the face portion 22a. Inside the color cathode ray tube 21, an internal magnetic shield 29 as an internal magnetic shield member is fixedly mounted on the frame 24 of the color selection mechanism 26.

The frame 2 of the color selection mechanism 26
In the embodiment of the present invention, the fastening of the internal magnetic shield 29 to the fourth member 4 is performed by the fastening member 30.

That is, as shown in FIGS. 2 and 3, a front opening 29a of the internal magnetic shield 29 formed similarly to the conventional internal magnetic shield 9 shown in FIGS. 4 and 5 described above.
A through hole 31 is provided in a fixing piece 29b protruding from the long side edge of the frame, and a through hole of the fixing piece 29b is formed in a portion of the frame 24 of the color selection mechanism 26 with which the fixing piece 29b comes into contact. A through hole 32 is provided corresponding to 31. The fixing piece 29b of the internal magnetic shield 29 abuts on the outer surface side of the frame 24 of the color selection mechanism 26 to make the through hole 31 a through hole 32 on the frame 24 side.
The fixing piece 29b is held by the frame 24 in a pressurized state by fitting a clip as the fastening member 30 into the communicating holes 31 and 32. 29 is fixed to the color selection mechanism 26.

As shown in FIGS. 2 and 3, the clip as the fastening member 30 is formed by bending a leaf spring material into two folds.
0a, an intermediate narrow insertion portion 30b, and a pressing surface portion 30c that is bent vertically outside the both ends. The clip as the fastening member 30 is inserted into the communicating holes 31 and 32 from the through hole 31 on the fixing piece 29a side. Are compressed against the elasticity, are elastically expanded by passing through the through holes 32 on the frame 24 side, are engaged with the inner surface side of the frame 24, and the intermediate fitting portion 30b is In this state, the pressing surfaces 30c at both ends are pressed against the outer surface of the fixed piece 29a to hold the fixed piece 29a in a pressed state with the frame 24, and the internal magnetic field is reduced. The shield 29 is fixed to the color selection mechanism 26.

As described above, the color selection mechanism 26 to which the internal magnetic shield 29 is fixed is provided with a plate-like spring 33 fixed to the frame 24 on the inner surface side of the panel 22 in the same manner as in the above-described conventional example. The fluorescent screen 28 on the inner surface of the face portion 22a of the panel 22 is supported by being inserted into and engaged with a pin 34 fixed to the inner surface of the skirt portion 22b.
Is opposed to.

As described above, in the color cathode ray tube 21 according to the embodiment of the present invention, the internal magnetic shield 29 is fixed to the color selection mechanism 26 without using a welding method. By providing through holes 31 and 32 in the piece 29b and the frame 24 of the color selection mechanism 26, the two through holes 31,
32 are connected to each other and fixed by inserting a clip as the fastening member 30, so that welding splash, burr and the like do not occur as in the prior art.
No. 1 can prevent the occurrence of discharge during the operation of applying a high voltage, and can improve the breakdown voltage characteristics.

Further, since the internal magnetic shield 29 is fixed to the color selection mechanism 26 by being held by the fastening member 30 in a pressure-tight manner as described above, welding is performed by the conventional fixing method. This eliminates the need for welding equipment, reduces equipment costs, facilitates fixing and assembling work, improves production efficiency, and enables cost reduction.

The embodiment of the present invention has been described above.
The present invention is not limited to this embodiment,
Various changes can be made without departing from the spirit of the present invention.

For example, the clip as the fastening member is not limited to a leaf spring material, but can be formed of a synthetic resin material having elasticity, and the shape is not limited to the embodiment. Any configuration may be used as long as the fixed piece of the internal magnetic shield can be held in a pressed state by the frame of the color selection mechanism.

The entire shape and configuration of the internal magnetic shield can be changed according to the shape of the funnel, the color selection mechanism, and the like.

[0031]

As described above, the color cathode ray tube according to the present invention is constructed such that the internal magnetic shield is fixed to the color selection mechanism using the fastening member without welding, so that the conventional color cathode ray tube is conventionally used. By the occurrence of such welding splashes, burrs, and the like, discharge that may occur during the operation of applying a high voltage is prevented, and the breakdown voltage characteristics of the cathode ray tube can be improved.

Further, according to the present invention, there is no need for a conventional welding facility for welding in fixing and assembling the color selection mechanism and the internal magnetic shield, and the facility cost can be reduced. The fixing and assembling work is facilitated, the production efficiency is improved, and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a partially cutaway plan view of an example of a color cathode ray tube according to the present invention.

FIG. 2 is an enlarged cross-sectional view of a fixing portion of the color cathode ray tube shown in FIG. 1 to a color selection mechanism of an internal magnetic shield.

FIG. 3 is an exploded perspective view of a fixing portion shown in FIG.

FIG. 4 is an exploded perspective view of a conventional color cathode ray tube.

5 is a perspective view of the color cathode ray tube shown in FIG. 4 in which an internal magnetic shield is fixed to a color selection mechanism.

[Explanation of symbols]

21: color cathode ray tube, 22: panel, 22a: face portion, 22b: skirt portion, 23: funnel, 23a
... Neck part, 24 ... Frame, 25 ... Color selection electrode thin plate, 26 ... Color selection mechanism, 27 ... Electron gun, 28 ... Fluorescent screen,
29: internal magnetic shield, 29a: front opening, 29b: fixing piece, 30: fastening member, 31, 32: through hole, 33: plate spring, 34: pin

Claims (4)

[Claims] 1. A color cathode-ray tube having a color selection mechanism formed by stretching a color selection electrode thin plate on a frame, and a color cathode ray tube having an internal magnetic shield, wherein the frame of the color selection mechanism includes the internal magnetic shield. A color cathode ray tube fixed by a fixing member. 2. A through hole is provided at a portion of the frame and the internal magnetic shield that overlap each other, corresponding to each other,
2. The color cathode ray tube according to claim 1, wherein the internal magnetic shield is fixed to the frame by the fastening member in the through hole. 3. The color cathode ray tube according to claim 1, wherein the fastening member has elasticity. 4. A color cathode ray tube according to claim 2, wherein a fastening member communicating with the through hole and having elasticity is inserted and elastically engaged, and the internal magnetic shield is attached to the frame. A color cathode ray tube characterized in that a color cathode ray tube is fixed.