KR950004319Y1 - Crt inner-shield - Google Patents

Abstract

No content.

Description

Inner shield anti-vibration structure of color CRT

1 is a partial cross-sectional view showing the configuration of the CRT.

2 is a perspective view of a combination of the conventional inner shield and the frame.

3 is a side view of a conventional inner shield and a frame.

Figure 4 is a side view of the inner shield and the frame according to an embodiment of the present invention.

Figure 5 is a side view of the inner shield and the frame according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

6: frame 7: inner shield

8: Clip 10, 10a: Vibration preventing piece

The present invention relates to an inner shield vibration preventing structure of a color brown tube, and particularly, to prevent vibration caused by impact by forming vibration preventing pieces on the frame side of the inner shield, and to prevent damage of the graphite coating film of the inner shield.

In general, a color CRT is formed of a panel 1 and a funnel 2 and a neck portion 3 behind it, as shown in FIGS. 1 to 3, and the neck portion 3 has an electron gun that emits an electron beam ( 4) is installed, and the panel 6 is provided with a frame 6 for fixing and instructing the shadow mask 5 for selectively passing the electron beam, and an inner shield for shielding the electron beam by shielding an external magnetic field. (7) is fixed.

The inner shield 7 is typically elastically fixed to the frame 6 by a fixing clip 8 and is coated on the inner surface of the panel 1 by a phosphor 9 which emits light by collision of an electron beam to reproduce color. It is.

In the CRT, when the electron beam emitted from the electron gun 4 is deflected and passes through the shadow mask 5 to reach the phosphor 9, the phosphor 9 emits light to reproduce colors through the screen.

At this time, the electron beam is affected by the geomagnetic field or the surrounding magnetic field, and thus does not have a normal direction of propagation and is bent irregularly to accurately pass through the hole of the shadow mask 5, thereby causing a problem in color reproduction. The inner shield 7 made of metal foil is attached to the non-passing part.

Inner shield 7 generally uses a low semi-small steel sheet having a thickness of about 0.15 mm in consideration of its weight, formability, and magnetic shielding effect. The inner shield 7 is formed on a frame 6 having a thickness of about 1.0 mm. It is elastically fixed by the fixing clip (8).

In addition, the inner shield 7 of the thin plate is deformed due to the heating rate is higher than the frame 6 at the time of collision of the electron beam and the stress generated during molding.

The heat of the inner shield 7 is transmitted to the frame 6 so as to accelerate the deformation of the temperature rise of the frame 6, thereby shifting the position of the shadow mask 5 fixed to the frame 6, thereby changing the passing position of the electron beam. Departure results in lower color reproduction.

In order to prevent the thermal deformation caused by the temperature rise of the inner shield 7 and the frame 6, the frame 6 and the inner shield, except for the fixing part by the clip 8, are conventionally shown in FIGS. The four corner edges of (7) are spaced at appropriate intervals. That is, to prevent the temperature from being transferred from the inner shield 7 to the frame 6.

However, the CRT is subjected to a lot of vibrations and shocks during the manufacturing process, during the transportation work or when the TV is mounted. In particular, the inner tube 7 is thin and the corner part with the frame 6 is separated from the vibration due to the impact. It causes the generation and deformation, and the graphite film of the frame 6 and the inner shield (7) drop off to cause discharge inside the CRT or to close the hole of the shadow mask (5) has the disadvantage of poor color reproduction.

Meanwhile, the screen shakes due to the shaking of the electron beam caused by the vibration of the inner shield 7 and the frame 6.

The present invention is to suppress the vibration of the inner shield and the frame to prevent the occurrence of deformation and dropping of the graphite film, and to improve the color reproduction by eliminating the discharge inside the CRT or the closing of the shadow mask. The anti-vibration piece is to be in contact with the frame.

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

Panel 1 and funnel 2 and neck portion 3 forming the CRT as shown in FIGS. 1 and 4 and 6, an electron gun 4 which is provided in the neck portion 3 and emits an electron beam, Phosphor 9 applied to the inner surface of the panel 1, the frame 6 fixed to the inner wall of the panel 1, and the electron beam fixed on the front side of the frame 6 and emitted from the electron gun 4 are selected. A shadow mask 5 passing through the phosphor 9 to reach the phosphor 9, an inner shield 7 fixed to the rear side of the frame 6 to shield an external magnetic field, and four sides and the frame 6 of the inner shield 7; It is composed of a vacuum preventing piece (10) formed by cutting the four corner edges of the inner shield (7) in a state in which the four corner portions of the inner space (7) are spaced at appropriate intervals.

In addition, the anti-vibration piece 10 is formed to elastically contact the frame (6).

Therefore, the present invention, when the electron beam emitted from the electron gun 4 as shown in Figs. 1 and 4 and 6 is deflected by the deflector and reaches the phosphor 9 while passing through the shadow mask 5, the phosphor 9 is The light is reproduced and reproduced through the screen, and the CRT is subjected to frequent shocks and vibrations during the manufacturing process, transportation or television mounting.

At this time, the vibration caused by the impact acts most strongly on the thinner inner shield 7, but the anti-vibration piece 10 formed on the inner shield 7

Since it is in elastic contact with the frame 6, it has a suppression ability corresponding to a vibration. In addition, since the anti-vibration piece 10 does not move even when an external shock is applied while the anti-vibration piece 10 is strongly in contact with the frame 6, the inner shield 7 does not easily vibrate and causes deformation. It can maintain a solid state without

In this way, the movement of the inner shield 7 and the contact friction with the frame 6 can be prevented, thereby preventing the graphite coating film from being scratched. The inner shield 7 and the frame 6 can be prevented when the CRT is attached to the television. It is possible to prevent the screen shaking caused by the vibration prevention.

5 shows another embodiment of the inner shield 7 of the present invention.

In this case, the bent state of the anti-vibration piece 10a is formed at an acute angle, and the support state of the inner shield 7 is more firm.

As described above, the present invention prevents vibration caused by the impact of the inner shield by the anti-vibration piece formed on the inner shield, and prevents the movement of the inner shield from the frame, thereby preventing deformation and dropping of the graphite coating film and the discharge phenomenon thereof. It has the effect of being able to remove the screen shake caused by the closing of the shadow mask and mechanical factors.

Claims (2)

By cutting the four corners of the inner shield (7) fixed to the frame (6) to form an anti-vibration piece (10) bent at a right angle, the anti-vibration piece (10) by elastic contact with the frame (6) Inner shield anti-vibration structure of color-brown tube, characterized in that configured to prevent vibration and movement of the inner shield. The inner shield anti-vibration structure according to claim 1, wherein the anti-vibration piece (10a) is bent at an acute angle.