KR200262574Y1 - Mask structure for color cathode ray tube - Google Patents

Abstract

The present invention relates to a mask structure for a color cathode ray tube, and in particular, to reduce the vibration transmitted through the mask structure from the outside to suppress the occurrence of howling phenomenon in the shadow mask and to provide a mask structure for improving image quality degradation through the have.

Vibration dampening structure of the present invention for realizing this is formed a plurality of extensions 13 on the long and short sides of the shadow mask (3), the extension 13 is an elastic material having the same frequency as the shadow mask It is connected by the connecting member 14, the connecting member 14 is provided with a mass 15 that can cause friction.

Description

Mask structure for color cathode ray tube

The present invention relates to a color cathode ray tube, and more particularly, to a structure for attenuating vibration transmission of a mask structure including a shadow mask, a frame, a mask spring, and the like coupled / supported to an inner surface of a cathode ray tube.

A general color cathode ray tube is mounted on the front side of the cathode ray tube as shown in FIG. 1, and a cathode ray tube is fused with frit glass at the rear end of the panel 1 coated with red, blue, and green phosphors. A funnel (2) forming an internal vacuum of the deflection, a deflection yoke (9) mounted at the rear end of the funnel (2), and an electron gun enclosed in the neck (10) of the funnel (2) to fire the electron beam (11) 8), a frame 4 coupled by a stud pin 6 and a mask spring 5 formed on the inner side of the panel 1, and a circular thin hole supported by the frame 4 and serving as color screening. The shadow mask 3 is formed innumerably, and the inner shield 7 is coupled to the frame 4 and shields the geomagnetic field so that the electron beam 11 is not affected by an external magnetic field.

When the image signal is input to the electron gun 8 for the operation of the conventional cathode ray tube configured as described above, thermal electrons are emitted from the cathode (not shown), and the emitted electrons are accelerated and focused toward the panel by a voltage applied to each electrode of the electron gun. It goes through the process.

The electron beam 11 emitted from the electron gun 8 is deflected by the deflection yoke 9 to pass through the mask hole formed in the shadow mask 3, and is formed on the inner surface of the panel 1 corresponding to the hole of the mask. The image is reproduced by striking the formed phosphor to emit light.

On the other hand, in recent years, as the resolution is increased, the size of the sound mask is emphasized by adopting a large-sized speaker and a high-power speaker, and the shadow mask 3 has a large number of holes and a narrow space between the holes for the delicate screen configuration. The thickness must be reduced, resulting in a weakening of the stiffness.

In this case, when the cathode ray tube is operated, the sound from the external vibration or the speaker is transmitted to the frame 4 through the mask spring 5 through the stud pin 6 inside the cathode ray tube and finally to the shadow mask 3. It is transmitted, causing vibration, and as a result, a screening (howling) phenomenon appears, causing a problem of deterioration of image quality.

In particular, when the vibration frequency transmitted from the outside and the natural frequency of the shadow mask coincide with each other, resonance occurs in the shadow mask, and thus, the screen blur phenomenon becomes more serious.

The present invention is designed to solve the problems of the prior art as described above, and provides a separate vibration damping structure for damping vibration transmission to the structure of the mask structure consisting of a shadow mask, a frame, and a mask spring to generate vibration of the shadow mask. The purpose is to suppress.

1 is an internal configuration diagram of a general color cathode ray tube.

2 is a perspective view of a structure of a conventional mask structure.

3 is a perspective view of the configuration of the mask structure according to an embodiment of the present invention.

4 is a block diagram of a mask structure according to another embodiment of the present invention.

*** Explanation of symbols for the main parts of the drawing ***

1 panel 2 funnel

3: shadow mask 4: frame

5: mask spring 6: stud pin

7: inner shield 8: electron gun

9: deflection yoke 10: neck portion

11 electron beam 13 mask extension part

14,14 ': connecting member 15,15': mass

In the vibration damping structure of the present invention for realizing the above object, a member having the same frequency as that of the shadow mask is provided at the long / short sides of the mask.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

In the color cathode ray tube to which the present invention is applied, the overall configuration and operation state except for the mask structure are the same as in the prior art, and thus, the description thereof will be omitted and the same reference numerals will be given.

3 illustrates a mask structure according to an embodiment of the present invention, and a plurality of mask extension parts 13 are formed at edges of the shadow mask 3, and a shadow mask is formed between the mask extension parts 13. The first connection member 14 having the same frequency as 3) and having a large internal history loss during vibration, such as magnesium (Mg) or aluminum, is connected, and the shadow mask (3) is connected to the first connection member (14). A cylindrical first mass 15 having the same frequency and capable of causing friction was provided.

The mask structure of the present invention having such a structure has a natural frequency of the frequency region causing the howling of the shadow mask 3.

When the vibration generated by the external shock or sound wave in this configuration is transmitted to the mask structure of the cathode ray tube via the panel (1) → stud pin (6) → mask spring (5), the frame (4) and the shadow mask (3). Vibration transmitted to the spread through the mask extension portion 13 having the same frequency region 13 and the first connecting member 14 formed of a beam or wire to quickly reduce the vibration in the shadow mask (3).

In addition, the vibration can be attenuated by friction between the first mass 15 and the first connecting member 14 having the natural frequency in the frequency region causing the vibration of the shadow mask 3.

4 shows a vibration damping structure according to another embodiment of the present invention, and a second connecting member 14 'is connected between the mask extension 13 and the frame 4, and the second connecting member 14' is connected. It is also provided with a cylindrical second mass 15 'to suppress the howling of the shadow mask (3) by the vibration transmitted through the frame (4) and the shadow mask (3).

On the other hand, Figure 5 illustrates the vibration damping principle of the present invention, the second mass having a relatively small mass with the same frequency (f) on one side of the first mass (M) having a large mass representing the shadow mask of the present invention In the structure in which (m) is supported by the elastic spring, the vibration generated in the first mass body M having a predetermined natural frequency f is transmitted to the second mass body m having the same frequency through the elastic spring. It can be seen that the vibration of the first mass (M) is attenuated. (C symbol means all attenuation such as friction, internal history reduction, collision, etc.)

As described above, the mask structure of the present invention allows the vibration transmitted from the outside to be attenuated by the damping member positioned around the mask, thereby suppressing the howling phenomenon which finally lowers the image quality of the mask.

Claims (8)

The openings through which electron beams are passed are arranged so that the shadow mask 3 performs color discrimination, a frame 4 coupled to and supporting the shadow mask 3, and mounted on an outer surface of the frame 4. In the mask structure consisting of a mask spring (5) coupled to the inside of the panel (1) to support the A plurality of extension parts 13 are formed at long and short sides of the shadow mask 3, The extension part (13) is a mask structure for a color cathode ray tube, characterized in that configured by being connected by a first connection member (14) of elastic material having the same frequency as the shadow mask (3). The method of claim 1, Mask structure for a color cathode ray tube, characterized in that the first connection member (14) is equipped with one or more mass (15) having the same frequency as the shadow mask (3). The method of claim 2, The mass body 15 is a mask structure for a color cathode ray tube, characterized in that made of a material containing magnesium or aluminum. The method of claim 2, The mass body 15 is a mask structure for a color cathode ray tube, characterized in that provided with a mass less than the shadow mask. The openings through which electron beams are passed are arranged so that the shadow mask 3 performs color discrimination, a frame 4 coupled to and supporting the shadow mask 3, and mounted on an outer surface of the frame 4. In the mask structure consisting of a mask spring (5) coupled to the inside of the panel (1) to support the A plurality of extension parts 13 are formed at long and short sides of the shadow mask 3, Mask structure for a color cathode ray tube, characterized in that the second connecting member 14 'of elastic material having the same frequency as the shadow mask 3 is connected between the front end of each of the extension portion 13 and the frame (4). . The method of claim 5, Mask structure for a color cathode ray tube, characterized in that the second connection member (14 ') is suspended one or more mass (15') having the same frequency as the shadow mask (3). The method of claim 6, The mass body 15 'is a mask structure for a color cathode ray tube, characterized in that made of magnesium or aluminum. The method of claim 6, The mass body (15 ') is a mask structure for a color cathode ray tube, characterized in that it is provided so that the mass less than the shadow mask.