KR20030012084A - Mitigate device of shadow mask for CRT - Google Patents

Abstract

PURPOSE: A vibration reduction apparatus is provided to prevent deterioration of color purity and improve screen quality by rapidly damping the vibration of the shadow mask caused due to the impact applied to the shadow mask. CONSTITUTION: A vibration reduction apparatus comprises a flat panel; a shadow mask(18) arranged at the inner surface of the panel; a mask frame(14) for applying a tension force to the shadow mask and supporting the shadow mask; and one or more damper wires(30) for preventing vibration of the shadow mask. The damper wire contacts the shadow mask so as to receive the tension force in a shorter side direction of the shadow mask, and has both ends attached to the mask frame. Each damper wire is spaced apart from a center line of the shadow mask.

Description

Shadow mask vibration reduction device of color cathode ray tube {Mitigate device of shadow mask for CRT}

The present invention relates to a shadow mask vibration reduction device of a color cathode ray tube, and more particularly, when an impact applied to the outside of the color cathode ray tube is transmitted to a shadow mask that serves as a color screen, the shadow mask vibrates. A shadow mask vibration reduction device of a color cathode ray tube equipped with a damper wire for attenuating vibration in a faster time.

In general, a color cathode ray tube emits an image by hitting a fluorescent surface formed in a predetermined pattern on the inner surface of the screen by the electron beam radiated from the electron gun, and maintains a constant distance from the fluorescent surface inside the panel. The shadow mask of the thin film is combined in a state in which a predetermined amount of tensile force is maintained by a mask frame, which is a separate support structure, to perform color selection of the electron beam.

1 is a side cross-sectional view for explaining the structure of a general color cathode ray tube 100, a flat panel on the front surface and a phosphor coated on the inner surface of the panel 12, and a stud pin formed on the rear surface of the panel 12 ( 15 is a rectangular frame-shaped mask frame 14 is coupled to the hook spring 16, the mask frame 14 is fixed in a state in which the tensile force is applied, the slot 17 for the color selection role of the electron beam is provided The formed shadow mask 18, a funnel 22 fixed to the panel 12 by frit glass, and having a neck portion 20 integrally formed at the rear thereof, and a neck portion of the funnel 22 20) and a deflection yoke 26 for enclosing the electron beam 24 to emit three electron beams of red, green and blue, and to be wrapped around the outer circumferential surface of the neck portion 20 to deflect the electron beam. .

Therefore, when power is applied to the cathode of the electron gun 24 and the electron beam is generated, the generated electron beam is accelerated and focused while passing through the accelerating electrode and the focusing electrode, and then is shadowed by the deflection yoke 26. The image is reproduced because the fluorescent material emits light by passing through the slot 17 formed in the N-axis and colliding with the fluorescent surface 10 applied to the inner surface of the panel 12.

The thin shadow mask 18 as described above is spot welded to the mask frame 14 fixed to the back surface of the panel 12 in the state where the tensile force is applied. The reason for applying the tensile force to the shadow mask 18 is that the shadow mask 18 is so thin that an electron beam that has not passed through the slot 17 on the shadow mask 18 impinges on the shadow mask 18. This is to prevent the occurrence of doming).

Therefore, the shadow mask 18 directly fixed to the mask frame 14 is located close to the rear surface of the panel 12 and is sensitive to vibration, so the shadow mask may be exposed to a small amount of energy due to external impact or acoustic vibration of the speaker. 18, the vibration continues for a long time (about 5 to 10 minutes), which is called howling phenomenon.

When the vibration occurs in the shadow mask 18 due to the howling phenomenon, the position of each slot 17 formed in the shadow mask 18 is changed, so that the electron beam passes through each slot 17 formed in the shadow mask 18. The problem is that the corresponding phosphor of the fluorescent surface 10 cannot be hit accurately, but hitting other adjacent phosphors simultaneously to lower the color purity.

Accordingly, the present invention has been made in view of the above problems, and the shadow mask vibration of the color cathode ray tube is appropriately prevented from applying a vibration to the shadow mask due to an external impact to deteriorate the image quality of the image display surface. It is an object of the invention to provide a device.

1 is a side cross-sectional view showing the structure of a conventional color cathode ray tube;

2 is a perspective view schematically showing a conventional shadow mask and a mask frame

3 is a perspective view and an enlarged view illustrating a shadow mask equipped with a damper wire of the present invention;

4 is a plan view of a shadow mask equipped with a damper wire of the present invention;

5 is a cross-sectional view taken along line AA ′ of FIG. 3.

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

10 fluorescent screen 12 panel

14 mask frame 15 stud pin

16: hook spring 17: slot

18: shadow mask 20: neck portion

22 funnel 24 electron gun

26: deflection yoke 30: damper wire

32: center line 34: edge line

36: support groove 38: plate

40: bimetal 100: color cathode ray tube

The present invention for achieving the above object is a flat panel which is an image display surface, a shadow mask which is located on the inner surface of the panel to perform the color selection function of the electron beam, and add a tensile force to the shadow mask and the panel and A mask frame for holding and supporting a predetermined gap and one or more damper wires for preventing shaking of the shadow mask are in contact with one surface of the shadow mask so that the mask mask receives tension force in a short side direction of the shadow mask, and both ends thereof are in contact with the mask frame. In the shadow mask vibration reducing device of the color cathode ray tube which is to be attached to the frame, the damper wire is characterized in that located at a point spaced apart from the centerline of the shadow mask by a predetermined distance.

When the length from the center line of the shadow mask to the edge line is L, the damper wire is located at a distance of 0.6L to 0.8L from the centerline of the shadow mask.

A support groove for supporting the position of the damper wire is formed at an edge portion of the mask frame to which the damper wire is in contact.

One surface of the mask frame to which both ends of the damper wire are attached is attached a bimetal for firmly fixing the damper wire as a cover, wherein one side of the bimetal is made of a material containing nickel and the other side is made of a material containing stainless steel. It is characterized by.

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

According to the present invention, a tensile force is applied to the flat panel 12 which is an image display surface, a shadow mask 18 positioned on the inner surface of the panel 12 to perform color selection of the electron beam, and a shadow mask 18. And a mask frame 14 for supporting and maintaining a predetermined distance from the panel 12, and one or more damper wires 30 for preventing the shadow mask 18 from shaking. In the shadow mask vibration reduction device of the color cathode ray tube 100 which is in contact with one surface of the shadow mask 18 so as to receive a tensile force in the short side direction is attached to the mask frame 14, the damper wire ( 30 is located at a point spaced apart by a predetermined distance from the center line 32 of the shadow mask 18 to the left and right.

When the length from the center line 32 to the edge line 34 of the shadow mask 18 is L, the damper wire 30 is 0.6L to 0.8L from the center line 32 of the shadow mask 18. Located at a distance from each other, a support groove 36 for supporting the position of the damper wire 30 is formed in the corner portion of the mask frame 14 in contact with the damper wire 30.

The damper wire 30 may be formed in a twisted shape in which a plurality of wires are twisted.

Plate 38 is formed at both ends of the damper wire 30 so as to be welded to the support groove 36.

One surface of the mask frame 14 to which both ends of the damper wire 30 are attached is attached a bimetal 40 for firmly fixing the damper wire 30 as a cover, and one side of the bimetal 40 Nickel-containing material, the other side is made of a material containing stainless steel.

In addition, the present invention provides a flat panel 12 which is an image display surface, a shadow mask 18 positioned on the inner surface of the panel 12 to perform color selection of the electron beam, and a tensile force on the shadow mask 18. And a mask frame 14 for supporting and maintaining a predetermined distance from the panel 12, and one or more damper wires 30 for preventing the shadow mask 18 from shaking. In the shadow mask vibration reduction device of the color cathode ray tube (100) which is in contact with one surface of the shadow mask 18 so as to be subjected to a tensile force in the short side direction of the) is attached to the mask frame 14, the damper The wire 30 is located at a point spaced apart by a predetermined distance from the center line 32 of the shadow mask 18 to the left and right, the length from the center line 32 to the edge line 34 of the shadow mask 18 To When L, the damper wire 30 is located at a distance of 0.6L to 0.8L from the center line 32 of the shadow mask 18, the mask frame 14 is in contact with the damper wire 30 A support groove 36 for supporting the position of the damper wire 30 is formed at an edge portion of the damper wire 30, and the damper wire is formed on one surface of the mask frame 14 to which both ends of the damper wire 30 are attached. The bimetal 40 is firmly fixed to the 30, and one side of the bimetal 40 includes a material containing nickel, and the other side includes a material containing stainless steel.

When the shock is transmitted from the outside of the color cathode ray tube 100 and the vibration is applied to the shadow mask 18, the electron beam radiated from the electron gun 24 opens the slot 17 of the shadow mask 18. It can effectively prevent the screen shake and the color purity degradation caused by not passing smoothly.

That is, by providing a damper wire 30 on the surface of the shadow mask 18, the damper wire 30 absorbs and extinguishes the vibration applied to the shadow mask 18, and thus the shadow mask 18 to which a given copper is applied. It is possible to prevent the position of the slot 17 of the variable.

In addition, according to the position where the damper wire 30 is installed, it is determined how effectively the vibration applied to the shadow mask 18 can be absorbed and extinguished, so in the present invention, the short side of the mask frame 14 is preferably The damper wire 30 is provided, and more preferably, the distance from the center line 32 to the edge line 34 of the shadow mask 18 is L, and the center line 32 is zero, the edge line 34. When 1) is a point of 1L, the damper wire 30 is installed at a position spaced apart by a distance of 0.6L to 0.8L from the center line 32 to the left and right.

If the damper wire 30 is installed in the range of 0 to 0.6L out of the range of 0.6L to 0.8L distance from the center line 32 as described above (hereinafter referred to as '1') or 0.8L to 1.0 Installing the damper wire 30 in the range of L (hereinafter referred to as '2') causes the following problems.

First, when 'case 1', since there is no obstacle for the vibration applied from the edge of the shadow mask 18, that is, the lateral direction of the shadow mask 18 to reach the damper wire 30 of the 'case 1' When the howling phenomenon occurs, even if vibration in the center portion of the shadow mask 18 is properly absorbed and extinguished, vibration on both sides is difficult to suppress, which may cause a problem that the edge of the screen vibrates severely.

In contrast to 'case 1', when 'case 2' is applied, vibration applied from the side of the shadow mask 18 may be blocked to some extent, but the damper wire 30 may not absorb or extinguish the excitation. When passing through the damper wire 30 to the center, the vibration is spread to a wider range, and the howling phenomenon is maintained for a long time.

However, when the damper wire 30 is installed at a position spaced at a distance of 0.6L to 0.8L from the center line 32 of the shadow mask 18 as described above in the present invention, the vibration transmitted from the side surface and the damper The excitation transmitted through the wire 30 to the center portion can be effectively absorbed and extinguished at the left and right sides.

The damper wire 30 may be provided in the long side direction of the mask frame 14. In this case, the distance of the damper wire 30 over the shadow mask 18 increases, so that the slot of the shadow mask 18 increases. (17) is more likely to cover, and in general, the vibration applied to the shadow mask 18 tends to spread in the lateral direction, so in the present invention, the damper wire 30 is preferably installed in the short side direction. Was constructed. However, since the installation of the damper wire 30 in the long side direction of the shadow mask 18 also belongs to the appended claims of the present invention, the installation direction of the damper wire 30 is not limited to a specific direction. .

The structure of the support groove 36 is to improve the problem that the break of the damper wire 30 is welded coupled to cause a relatively large stress to easily break the wire, the damper wire 30 Forming the support groove 36 in the corner portion is contacted to reduce the tensile force of the damper wire 30 can improve the disconnection phenomenon, through which the damping welding requiring high tensile force of the damper wire 30 This would be possible. High damping force due to such damping welding can attenuate the vibration of the shadow mask 18 more quickly to improve the howling phenomenon. In addition, the support groove 36 serves to support the position of the damper wire 30 to improve workability when welding the damper wire 30, and the position of the damper wire 30 due to external impact. Can also be prevented.

Plate 38 is formed at both ends of the damper wire 30 so as to be welded to the support groove 36, and a bimetal (2) is formed on the upper surface of the plate 38 including both ends of the damper wire 30. The plate 38 including the damper wire 30 may be firmly fixed by welding 40.

In addition, the bimetal 40 is made by combining a double metal having a different coefficient of thermal expansion, one side of the material containing nickel, the other side of the material containing stainless, for example, one side is 36% nickel material, the other side is stainless Two metal surfaces made of a material to be bonded together are formed, and a surface made of a material containing stainless steel resistant to thermal expansion is attached to the surface of the mask frame 14, for example, by spot welding, so that the damper wire 30 is formed. And it can be firmly fixed to the plate 38 connected thereto. At this time, the surface of the bimetal (40) made of a nickel-containing material has a small deformation force for thermal expansion, and a surface made of a material containing stainless steel has a large deformation force for thermal expansion, so that when attached to the mask frame 14 The surfaces made of stainless steel are welded in close contact.

As a result, an electron beam that fails to pass through the slot 17 of the shadow mask 18 collides with the shadow mask 18. Even though a thermal expansion phenomenon occurs and the problem that the mask frame 14 is thermally expanded is caused, Since the bimetal 40 is tensioned and contracted in accordance with the tension and contraction of the mask frame 14, it is possible to prevent both ends of the damper wire 30 from falling off from the mask frame 14.

In addition, the damper wire 30 is preferably selected in diameter so as to be disposed between the slot 17 and the slot 17, in order to prevent the passage of the electron beam to block the slot 17.

Accordingly, the present invention can effectively prevent the phenomenon of image blurring and color purity deterioration due to physical shock or acoustic vibration of the speaker from the outside, and improve the image quality.

Claims (5)

A flat panel which is an image display surface, a shadow mask which is located on the inner surface of the panel to perform the color sorting function of the electron beam, and a mask frame that couples and supports the shadow mask to maintain a predetermined distance from the panel by applying tensile force to the shadow mask. And a shadow of a color cathode ray tube in which at least one damper wire for preventing shaking of the shadow mask is in contact with one surface of the shadow mask so as to be tensioned in a short side direction of the shadow mask, and both ends thereof are attached to the mask frame. In the mask vibration reduction device, The damper wire is a shadow mask vibration reduction device of the color cathode ray tube, characterized in that located at a point spaced apart from the centerline of the shadow mask by a predetermined distance. The method of claim 1, When the length from the center line to the edge line of the shadow mask is L, the damper wire is located at a distance of 0.6L to 0.8L from the centerline of the shadow mask to reduce shadow mask vibration of the color cathode ray tube. Device. The method according to claim 1 or 2, Shadow mask vibration reduction device of the color cathode ray tube, characterized in that the support groove for supporting the position of the damper wire is formed in the corner portion of the mask frame in contact with the damper wire. The method according to any one of claims 1 to 3, One surface of the mask frame to which both ends of the damper wire are attached is attached a bimetal for firmly fixing the damper wire as a cover, wherein one side of the bimetal is made of a material containing nickel and the other side is made of a material containing stainless steel. Shadow mask vibration reduction device of the color cathode ray tube, characterized in that. A flat panel which is an image display surface, a shadow mask which is located on the inner surface of the panel to perform the color sorting function of the electron beam, and a mask frame that couples and supports the shadow mask to maintain a predetermined distance from the panel by applying tensile force to the shadow mask. And a shadow of a color cathode ray tube in which at least one damper wire for preventing shaking of the shadow mask is in contact with one surface of the shadow mask so as to be tensioned in a short side direction of the shadow mask, and both ends thereof are attached to the mask frame. In the mask vibration reduction device, The damper wire is located at a point spaced apart from the centerline of the shadow mask by a predetermined distance to the left and right, and when the length from the centerline to the edgeline of the shadow mask is L, the damper wire is separated from the centerline of the shadow mask. The mask frame is spaced apart by a distance of 0.6L to 0.8L, and a support groove for supporting the position of the damper wire is formed at an edge portion of the mask frame to which the damper wire is in contact, and both ends of the damper wire are attached. Shadow mask vibration of the color cathode ray tube, characterized in that a bimetal is attached to one side of the cover to firmly fix the damper wire, one side of the bimetal is made of a material containing nickel, the other side is made of stainless steel. Abatement system.