KR19990086227A - Frame Structure of Cathode Ray Tube - Google Patents

Abstract

The present invention relates to a frame structure of a cathode ray tube, and in particular, in order to prevent shaking of the shadow mask against external vibrations, when the vibration is transmitted, it uses the property of exponentially attenuating according to the length of the transmission path while passing through the medium. Therefore, the object of the present invention is to minimize the effect of vibration on the mask by lengthening the path from the panel to the mask to reach the mask as long as possible.

In order to realize this, the present invention forms a frame, a spring, and a stud pin in a double coupling structure, and the mounting positions of the springs mounted on the respective inner and outer frames are formed at one side of the long / short side and the other side of the corner. .

Description

Frame Structure of Cathode Ray Tube

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color cathode ray tube, and more particularly to a frame structure in which a shadow mask is fixedly supported to maintain a constant distance from an inner surface of a panel.

A general color cathode ray tube is mounted on the front side of the cathode ray tube as shown in FIG. A funnel (2) forming an internal vacuum (10 ^-7 torr) of the tube, a deflection yoke (9) mounted at the rear end of the funnel (2), and a neck (10) of the funnel (2) are encapsulated. An electron gun 8 for emitting an electron beam 11, a frame 4 coupled by a stud pin 6 and a spring 5 formed on the inner surface of the panel 1, and coupled to the frame 4 Inner shield 7 shielding the geomagnetic field such that the shadow mask 3 having numerous circular thin holes for color selection and the electron beam 11 deflected by the deflection yoke 9 are not affected by an external magnetic field. It consists of

In the conventional cathode ray tube configured as described above, the electron beam 11 from the electron gun 8 is deflected by the deflection yoke 9 and passes through the mask hole formed in the shadow mask 3 to correspond to the hole of the mask ( 1) The image is reproduced by striking the phosphor formed on the inner surface to emit light. On the other hand, the shadow mask (3) of the cathode ray tube that is operating as described above because the color selection function of the electron beam (11) should be fixed in position even under the influence of external vibration. When external vibration is transmitted through the panel 1, the vibration is transmitted to the spring 5 connecting the panel 1 and the frame 4 to attenuate the vibration first, and the vibration is passed through the frame 4 secondly. It is attenuated and transmitted to the mask 3 through a welding point, which is a connection between the frame 4 and the mask 3. The vibration of the mask 3 affects the screen and may appear as a screen shake.

In the conventional mask 3, the thickness and material of the spring 5 and the frame 4 are changed to prevent the vibration of the mask 3 due to external vibration, thereby minimizing the transmission of external vibration or the frame 4. Beads were formed to resist vibration.

In particular, in the case of having a mask 3 structure that is planar or close to it, the shape is mostly maintained by applying tension, and since the structure is particularly sensitive to external vibration, the damper wire is formed along the curved surface of the mask 3 as shown in FIG. 4. It was tried to reduce the trembling of the mask (3) against external vibration by connecting and compressing while applying tension to (13).

In this way, the bead is formed in the thickness and material of the spring 5 and the frame 4 and the shape of the frame 4, but the installation of the damper wire 13 along the curved surface of the mask 3 has a fatal adverse effect on the screen. It is provided for the purpose of preventing the shaking of the mask (3) against the external vibration that causes the.

Although the thickness of the spring 5 and the frame 4, the material change, and the bead formation of the frame 4 can increase the strength against the vibration, the effect of the vibration can be seen, but the greatest effect on the damping of the vibration is the transmission path. , The transmission of vibrations decreases exponentially in the length of the path. The conventional spring 5, frame 4 and mask 3 structures have a limited effect since the transmission path from the external vibration to the mask 3 is relatively short.

In addition, the installation of the damper wire 13 may deform the mask 3 itself if it is not completely absorbed by the surface of the mask 3, and the anti-shake effect of the mask 3 against external vibration is also halved. In addition, in order to improve the anti-shake effect, the mask 3 should be compressed by applying sufficient tension to the damper wire 13. When the damper wire 13 is compressed, the mask 3 is partially applied to the mask 3. It may cause deformation of (3). Therefore, the mask 3 and the damper wire 13 are difficult to fully adsorb to the mask 3 surface in the completed cathode ray tube, and the mask 3 and the damper wire 13 are not in contact with each other. Vibration remained and there was a problem that complete improvement was difficult.

The present invention is invented to solve the problems of the prior art as described above by configuring a frame and a spring structure for supporting the shadow mask in a double coupling structure, the long path of the external vibration transmitted to the shadow mask transfer process It aims to attenuate by using and prevent the shaking of shadow mask against external vibration.

1 is a structural diagram of a typical cathode ray tube.

2 shows a conventional mask frame structure,

(A) The top view.

(B) side view.

Figure 3 is a perspective view of a conventional structure with a damper wire.

4 is a view showing the vibration damping effect according to the distance.

5 is a plan view of the mask frame structure according to the present invention.

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

101 panel 103: shadow mask

104: inner frame 105: outer frame

106: inner spring 107: outer spring

108, 109: stud pins

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

First, the configuration of the mask structure of the present invention will be described with reference to FIG. 5.

The frame structure includes an inner frame 104 directly contacting the shadow mask 103, an inner spring 106 located at a corner connecting the inner frame 104 and the outer frame 105, an outer frame 105 and a panel. It consists of an outer spring 107 which is mounted on the long / short side connecting the inner surface 101.

In the drawings, reference numerals 108 and 109 denote study pins on which springs 106 and 107 are mounted, respectively.

Referring to the operation of the present invention having such a dual structure as follows.

When the external vibration is transmitted from the panel 101 or the funnel, a part of the vibration is attenuated while being transmitted from the stud pin 109 on the surface of the panel 101 to the external frame 105 through the external spring 107. In addition, the inner spring 106 at the long / short side where the outer spring 107 is located when propagating the frame in the process of being transmitted from the outer frame 105 to the inner spring 106 to be delivered to the inner frame 104 is transmitted. It propagates to the corner part where) is located. When the vibration propagates through the medium as shown in [Equation 1], the strength of the vibration decreases exponentially with the propagation length.

[Equation 1]

Where I is the intensity of the transmitted vibration, I ₀ is the intensity of the external vibration transmitted first, and d is the length of the transmitted path, and γ is the distance by which the vibration is reduced by 63% in the medium. to be.)

Therefore, as shown in FIG. 4, as the length of the path through which vibration is transmitted increases, the exponent increases negatively, and the intensity of vibration transmitted decreases exponentially.

The propagation process of the outer frame 105 in the process of the vibration transmitted from the outer spring 107 to the inner spring 106 is greatly reduced by the transmission of the outer frame 105 to the corner at the farthest side in the structure. Can be. Then, when propagating the inner spring 106 that connects the inner frame 104 and the mask 103, the external vibration that is finally attenuated and transmitted to the mask 103 can be greatly reduced.

In another embodiment of the present invention, the position of the outer spring 107 may be located at the corner portion, and the inner spring 106 may be provided at the long / short side, and the outer and inner springs 106 and 107 may be considered only in consideration of the effect of the double spring. ) Can be placed on either side or corner.

In addition, in consideration of the effects of the double frame only, the connection portion of the inner frame 104 and the outer frame 105 and the connection portion of the outer frame 105 and the panel 101 can be applied differently.

As described above, the frame structure of the present invention forms the frame and the spring in a double coupling structure to sufficiently attenuate the external vibration transmitted to the shadow mask by using a long path of the transmission process, thereby preventing the vibration of the mask caused by the external vibration. There is a significant drop effect.

Claims (2)

A panel coated with R, G, and B fluorescent films on the inner surface, a funnel fused to the rear end of the panel, an electron gun encapsulated in the neck portion of the funnel, and an electron beam emitted from the electron gun are used to cover the entire surface of the fluorescent film. A deflection yoke for deflecting the electron beam so as to strike the frame; a frame supported inside the panel; a shadow mask supported by the frame and arranged with openings in slots or dots to pass through the electron beam; In the cathode ray tube consisting of a spring mounted on the outer surface to support the The frame and the spring is a plurality of frame structure of the cathode ray tube, characterized in that composed of a double coupling structure in which one frame is positioned at a predetermined interval on the outside of the other one frame. The method of claim 1, The first spring mounted to one frame of the frame and the spring of the double coupling structure is located at the corner of the frame, The second spring is mounted to the other frame is the frame structure of the cathode ray tube, characterized in that located on each of the long and short sides of the frame.