JP2001266763A - Color cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem where a whole frame is subjected to vibration, such as the vibration of a chord with a node at the position of a mounting fitting, when vibration or impact is applied to the frame, causing the vibration or shifting of electron beam passing holes in a shadow mask. SOLUTION: A color cathode-ray tube comprises the frame 3, having a pair of long-axis supports 1 and a pair of short-axis supports 2 mounted between the pair of long-axis supports, opposing each other, and the shadow mask 4 having the electron beam passing holes 5, the frame 3 being so constructed for absorbing the vibration propagated, using friction.

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 used for televisions, computer displays, and the like.

[0002]

2. Description of the Related Art In general, a cathode ray tube has a color selecting electrode for color selecting an electron beam emitted from an electron gun and a frame for holding the color selecting electrode.

[0003] As a type of the color selection electrode structure, a press mask formed by pressing a plate member having a large number of rectangular, circular and elliptical electron beam passage holes into a predetermined curved shape and welding it to a frame. (FIG. 4a), a two-dimensional tension mask stretch-welded to a frame in a state where tension is applied to a flat plate member having a similar electron beam passage hole in two-dimensional directions of a long axis and a short axis (FIG. 4b), A one-dimensional tension mask stretch-welded to a frame in a state where tension is applied to only one dimension in either the short axis or the long axis direction to a flat plate member having many similar electron beam passage holes (FIG. 4).
c) or an aperture grill (see Japanese Patent Application Laid-Open No. 4-163830) in which tension is applied to a member made of a number of metal strips and stretch-welded to a frame.

[0004] Of these, the one using a shadow mask is composed of a long shaft support 1 such as a steel material having an L-shaped cross section and a square steel material bent into a U shape as shown in FIG. It comprises a frame 3 formed in a rectangular shape by a short axis support 2 welded to the left and right ends, and a shadow mask 4 having a plurality of electron beam passage holes and being stretched. Then, an electron beam emitted from the electron gun of the cathode ray tube passes through the electron beam passage hole 5 of the shadow mask to cause the phosphor of the panel to emit light, thereby forming a screen as a set of fine light spots. At this time, the positions of the shadow mask 4 and the electron beam passage holes 5 are accurately maintained by attaching the shadow mask 4 to the rigid frame 3 with tension.

However, when vibration or impact force is applied from the outside of the cathode ray tube, the frame 3 vibrates, and the vibration of the frame 3 is transmitted to the shadow mask 4, so that the position of the electron beam passage hole 5 is shifted to the front, rear, left and right. Will be. When the position of the electron beam passage hole 5 moves, the light spot on the screen moves or the focus is blurred, and problems such as color shift and blur occur on the screen, thereby deteriorating the screen quality.

In a color TV, a large loudspeaker may be installed adjacent to a cathode ray tube, and vibrations caused by a sound from the loudspeaker are easily transmitted to a shadow mask through a frame. In particular, TV screens have been increasing in size in recent years, and the shadow mask itself has a large area.
Further, the shadow mask is easily vibrated and moved, which easily affects the screen quality.

In order to prevent the vibration of the conventional shadow mask, Japanese Patent Application No. 10-246913 proposes a technique for suppressing the vibration of the shadow mask by attaching a detachable vibration preventing ring to the shadow mask. ing.

[0008]

By the way, the frame is
It is attached to the front panel of the cathode ray tube with a plurality of mounting brackets arranged on the outer surface. Even if the above-described vibration preventing ring can prevent the vibration or movement of the shadow mask with respect to the frame, when the entire frame vibrates or moves, the electron beam passage holes of the shadow mask move, thereby deteriorating the screen quality. Would. That is, if vibration or impact is applied to the frame in the above state, the entire frame will vibrate in a state like vibration of a string that makes the position of the mounting bracket a node. If the entire frame vibrates, there is a problem that no matter how much the vibration of the shadow mask with respect to the frame is suppressed, the movement of the electron beam passage hole cannot be prevented.

Further, if the rigidity of the frame is increased or the frame is more firmly fixed to the front panel, the possibility of vibration occurring in the frame is reduced. However, a rigid frame increases in weight and outer shape. I will. In order to firmly fix the frame to the front panel, the fixing structure becomes complicated or the number of fixing points increases, so that the efficiency of the fixing operation decreases and the cost increases.

Accordingly, the present invention is to provide a color cathode ray tube which has solved the above-mentioned problems, and which has a simple structure and efficiently prevents vibration of a frame portion of a shadow mask structure, and provides a screen quality of the cathode ray tube. Is to improve.

[0011]

In order to achieve this object, a color cathode ray tube according to the present invention is a color cathode ray tube comprising a panel and a shadow mask structure, wherein the shadow mask structure comprises a pair of opposing ones. A frame consisting of a long axis support and a pair of short axis supports attached between the pair of long axis supports, and a shadow mask attached to the frame and having an electron beam passage hole, wherein the frame is The structure is such that the propagated vibration is absorbed by friction.

The color cathode ray tube of the present invention is a color cathode ray tube comprising a panel and a shadow mask structure, wherein the shadow mask structure comprises a pair of opposed long axis supports and a pair of long axis supports. A frame consisting of a pair of short axis supports attached between the body, and a shadow mask attached to the frame and having an electron beam passage hole, the long axis support has a laminated structure, and the frame This is a structure that absorbs the generated vibration by friction.

According to these configurations, even if a vibration or an impact force is applied from the outside of the cathode ray tube, the vibration propagated in the frame can be absorbed by friction, so that the position of the electron beam passage hole does not shift from front to back, right and left, and the screen is displayed on the screen. The light spot moves or the focus is blurred, and the screen does not have a problem such as color shift or blur, and the screen quality can be improved.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below with reference to the drawings.

FIG. 1 is a partial sectional view of a color picture tube using a shadow mask structure according to a first embodiment of the present invention.
As shown in FIG. 1, the color picture tube forms an envelope with a front panel 8 having a phosphor screen 7 formed on an inner surface thereof and a funnel 9 connected to the rear of the front panel 8. An electron gun 11 for emitting an electron beam 10 is built in the neck portion 9 a, and a deflection yoke 12 for deflecting the electron beam 10 is mounted on the outer peripheral surface of the funnel 9. Phosphor dots of three colors are applied to the inner surface of the front panel 8, thereby forming a phosphor screen 7. A flat plate-shaped shadow mask 4 is arranged substantially parallel to the phosphor screen 7. I have. The shadow mask 4 is formed by performing an etching process on a flat plate, has a large number of regularly arranged electron beam passage holes, and color-selects three electron beams 10 emitted from an electron gun 11. The shadow mask structure 13 is formed by being held by the frame 3. The shadow mask structure 13 is locked in the envelope by fitting an elastic support 14 attached to the frame 3 and a pin 15 arranged on the front panel 8.

FIG. 2 shows a shadow mask structure according to a first embodiment of the present invention.
Is made of a highly rigid metal such as stainless steel. The shape of the frame 3 has a predetermined dimensional shape such as a rectangular shape in accordance with the dimensional shape of a cathode ray tube such as a TV receiver. The frame 3 can be provided with a fixing portion such as a fixing fitting for attaching to the front panel of the cathode ray tube. The shadow mask 4 is made of a thin iron plate or the like, and has an electron beam passage hole 5 formed of a fine hole or slit penetrating substantially over the front surface.

The damping piece 16 is provided as a damping means, one end of which is attached to the long shaft support 1 by welding or the like, is elastically deformable, and the other end of which is in contact with the short shaft support 2. It extends to the position where it touches. By the way, as a material of the damping member 16, a material having a heat resistance to withstand high heat applied in a manufacturing process of the shadow mask 4 and having an action of absorbing vibration by being elastically deformed, such as a stainless steel plate, is used. In addition to metal, ceramic, glass, or the like can be used. If the damping member 16 is made of a hard-magnetic material, a damping metal, the damping effect is high and the adverse effect due to the magnetization hardly occurs. The hard magnetic material is a material having a high relative magnetic permeability and a small coercive force. Specifically, a material obtained by heat-treating a mild steel material, a stainless steel material specified by JIS such as a 13Cr alloy, or the like can be used.

Here, when vibration or impact is applied to the cathode ray tube, the amplitude of the vibration is zero or extremely small at the position of the fixture in the frame 3 which is firmly fixed to the front panel. However, in a portion not fixed by the fixing bracket, the frame 3 can relatively freely vibrate, and the amplitude increases. At this time, in the frame 3, the portion where the long-axis support 1 and the short-axis support 2 are welded is greatly deformed, so that the vibration damping piece 16 attached to the short-axis support 2 and the long-axis support 1 , A relative displacement occurs in the abutting portion, and the energy of the vibration is absorbed by the frictional contact, and the effect of suppressing the vibration is obtained.

The contact force between the damping piece 16 and the frame 3 is preferably 5 to 20N. If the contact force is smaller than 5N, the frictional force required to suppress the vibration of the frame 3 cannot be obtained. If the contact force is larger than 20N, the vibration damping piece 16 and the frame 3 adhere to each other, and a difference in relative displacement does not occur between the two, and the vibration of the frame 3 cannot be suppressed. is there.

The effect can be further enhanced by providing the damping pieces 16 at the four corners of the frame 3. Further, in this example, the damping member 16 is fixed to the long shaft support 1 by welding, and is provided so as to be in contact with the short shaft support 2. And fixed, and the long shaft support 1
May be provided so as to be in contact with.

FIG. 3 shows a shadow mask structure according to a second embodiment of the present invention. In FIG. 3, the long axis support 1 has a laminated structure. The long shaft support 1 is formed by laminating two L-shaped plates, and is fixed at the center of the long shaft support 1. When vibration is transmitted from the outside to the frame 3 by the long axis support 1 having a laminated structure, friction occurs between the layers of the laminate, and the energy of the vibration is absorbed by the friction and the vibration is suppressed. The effect is obtained.

In this example, the long shaft support 1 is composed of two members. However, the same effect can be obtained even if it is composed of three or more members.

[0023]

As described above, according to the present invention,
A panel and a color cathode ray tube comprising a shadow mask structure, wherein the shadow mask structure is composed of a pair of opposed long axis supports and a pair of short axis supports attached between the pair of long axis supports. Frame, and a shadow mask attached to the frame and having an electron beam passage hole, the frame has a structure in which the transmitted vibration is absorbed by friction. The energy of the vibration is absorbed, and the effect of suppressing the vibration is obtained.

Also, a frame composed of a pair of long axis supports opposed to each other and a pair of short axis supports attached between the pair of long axis supports, and an electron beam passage hole attached to the frame, The long axis support has a laminated structure, and the frame has a structure that absorbs the propagated vibration by friction, and the energy of the vibration is reduced by the friction between the layers of the layer. Absorbed,
The effect of suppressing vibration is obtained.

[Brief description of the drawings]

FIG. 1 is a partial sectional view of a color picture tube using a shadow mask structure according to a first embodiment of the present invention.

FIG. 2 is a perspective view of a shadow mask structure according to the first embodiment of the present invention.

FIG. 3 is a perspective view of a shadow mask structure according to a second embodiment of the present invention.

FIG. 4 is a perspective view showing types of conventional color selection electrodes.

FIG. 5 is a perspective view showing a frame structure of a shadow mask.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Long axis support 2 Short axis support 3 Frame 4 Shadow mask 5 Electron beam passage hole 6 Elastic support 8 Panel 13 Shadow mask structure

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yuwa Shizumi 1006 Kazuma Kadoma, Kazuma, Osaka Matsushita Electric Industrial Co., Ltd. F-term (reference) 5C031 EE08 EE11 EF05

Claims (3)

[Claims] 1. A color cathode ray tube comprising a panel and a shadow mask structure, wherein the shadow mask structure comprises:
A frame consisting of a pair of opposed long axis supports and a pair of short axis supports attached between the pair of long axis supports, a shadow mask attached to the frame and having an electron beam passage hole, One end is attached to one of the short axis support or the long axis support, and the other end is in contact with the other of the long axis support or the short axis support,
A color cathode ray tube, comprising: a damping piece that is elastically deformable. 2. The color cathode ray tube according to claim 1, wherein the contact force at the contact position is 5 to 20 N. 3. A color cathode ray tube comprising a panel and a shadow mask structure, wherein the shadow mask structure comprises:
A frame consisting of a pair of opposed long axis supports and a pair of short axis supports attached between the pair of long axis supports, and a shadow mask attached to the frame and having an electron beam passage hole. Wherein the long-axis support has a laminated structure.