JPH11224615A - Vibration damper device for color selection electrode for cathode-ray tube - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress a vibration of an aperture grille from the outside without using a damper wire. SOLUTION: A color selection electrode 1 for a cathode-ray tube has a frame 7 with a pair of A members 9 and an aperture grille 5 to which end portions of a tape portion arranged mutually with slits are connected by a joint portion 31, in which the aperture grille 5 is tightly stretched to the pair of A members 9 by fixing the joint portion 31, wherein a comb-shaped member 23 forming a plurality of comb teeth is overlapped on the surface of the joint portion 31 by inserting the comb teeth into the slits. A belt member 25 is overlapped with the surface of the comb-shaped member 23 and both ends in the longitudinal direction are fixed to the frame 7, thereby holding the comb-shaped member 23 between the belt member 25 and the joint portion 31.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration damping device for a color selection electrode for a cathode ray tube, which attenuates the vibration of an aperture grill stretched over the color selection electrode.

[0002]

2. Description of the Related Art On a front panel side of a color cathode ray tube, a color selection electrode for selecting electrons from an electron gun and passing the electrons through a phosphor screen is mounted. As shown in FIG. 8, the color selection electrode 1 supports a metal mask sheet (aperture grill) 5 having a plurality of parallel slits 3 formed thereon and spans the aperture grill 5 under tension. The main part has a substantially square frame 7 to be (stretched).

The frame 7 comprises a pair of parallel A members 9 having a substantially L-shaped cross section and a pair of parallel B members 11 connecting both ends of the A member 9. The aperture grill 5 is stretched by welding edges of both ends in the longitudinal direction of the slit 3 to a pair of A members 9.

In order to stretch the aperture grill 5 on the frame 7, before welding the aperture grill 5 to the frame 7, the pair of A members 9 are pressed in the approaching direction to elastically deform the B members 11. In this state, the aperture grill 5 is welded to the A member 9. Then, by releasing the pressure on the A member 9, the elastic return force of the B member 11
The aperture grill 5 is stretched on the frame 7 under tension.

A frame 7 on which an aperture grill 5 is stretched
Is mounted on a holder 13 fixed to the B member 11, and is supported on a front panel of a cathode ray tube (not shown) via the spring 15. According to such a color selection electrode 1, it is possible to prevent the aperture grill 5 from being loosened due to thermal expansion that occurs during the operation of the cathode ray tube, and to suppress color misregistration.

[0006]

In the above-described color selection electrode, the aperture grill is stretched over the frame, and the frame is supported on the front panel via a spring. The tape portion between the slits may vibrate like a string. Since the inside of the cathode ray tube is close to a vacuum, once such a vibration of the tape portion occurs, the vibration does not stop for a long time. When the tape portion vibrates, the electron beam does not emit light at the correct portion of the fluorescent portion on the front panel, causing image shaking and problems such as contact between adjacent tape portions.

In order to solve such a problem, in a conventional color selection electrode, an extremely thin steel wire of 15 to 22 μm called a damper wire is stretched on an aperture grill in a direction orthogonal to a slit, and the damper wire 17 is formed. And the aperture grille 5 are slightly brought into contact with each other, so that the damping is accelerated by friction, and a mechanism for suppressing image fluctuation is employed.

However, if the contact with the aperture grill is not optimal, the damper wire 17 has no effect on the image fluctuation, and in some cases, the aperture grill becomes uneven and the color selection electrode does not function properly. There was a problem that maintenance was difficult. Also,
During operation of the cathode ray tube, particularly when displaying a white image, the damper line is likely to be visually recognized as a shadow on the image, and there is a possibility that the image quality may be degraded.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration damping device for a color selection electrode for a cathode ray tube, which can prevent vibration of an aperture grill due to an external input without using a damper wire.

[0010]

According to a first aspect of the present invention, there is provided a vibration damping device comprising: a frame having a pair of elastically supported parallel A members; An aperture grille in which ends of both ends in the longitudinal direction of the tape portion alternately arranged with the slits are connected by a continuous portion, and the aperture grill is stretched to the pair of A members by fixing the continuous portion. What is claimed is: 1. A vibration damping device for damping vibration of said aperture grill of a color selection electrode for a cathode ray tube, said comb being formed on a surface of said continuous portion and having a plurality of comb teeth inserted corresponding to said slits. A member and a band-shaped member which is superposed on the surface of the comb-shaped member and holds the comb-shaped member between the continuous portion by fixing both ends in the longitudinal direction to the frame.

In this vibration damping device, the comb teeth of the comb-shaped member are arranged in the slit, and when the tape portion vibrates due to an external input, the vibration of the tape portion is attenuated by the collision and friction with the comb teeth and the band-shaped member. . Thus, the vibration of the color selection electrode is prevented without using a damper wire that may be visually recognized in an image.

According to a second aspect of the present invention, in the vibration damping device, a plurality of concave grooves into which the tape portions are respectively formed are formed on a surface of the band-shaped member facing the continuous portion, and the band-shaped member is formed without using the comb-shaped member. The tape portion is arranged in the groove by directly overlapping the continuous portion.

[0013] In this vibration damping device, the tape portion is disposed in the concave groove by directly overlapping the belt-like member on the continuous portion without using the comb-shaped member, and the vibration of the tape portion is caused by the tape portion and the inner surface of the concave groove. Damped by collision and friction. Thus, the tape portion can be attenuated without using a comb-shaped member.

According to a third aspect of the present invention, in the vibration damping device, the comb-shaped member is divided into a plurality in the longitudinal direction of the continuous portion.

In this vibration damping device, the comb-shaped member is divided into a plurality of parts, and the length of each divided comb-shaped member is made into a single module unit or a plurality of module units. There is no need to arrange a plurality of types of members for each size of the aperture grill. Further, even if a part of the comb is damaged, it is good and economical to replace only the damaged part.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of a vibration damping device according to the present invention will be described below in detail with reference to the drawings.
Note that the same members as those shown in FIG. 8 are denoted by the same reference numerals, and redundant description will be omitted. FIG. 1 is a perspective view of a color selection electrode to which a vibration damping device according to the present invention is attached, FIG. 2 is an explanatory view showing the entire aperture grille and an enlarged portion of one end of a slit, and FIG. FIG. 4 is a perspective view of a color selection electrode, FIG. 4 is an explanatory view showing the entire comb-shaped member and an enlarged comb-teeth portion thereof, and FIG.

As shown in FIG. 1, two sets of the vibration damping device 21 according to the present embodiment are attached to the color selection electrode 1 in which the aperture grille 5 is stretched over the A member 9. The vibration damping device 21 includes a comb-shaped member 23 and a band-shaped member 25.

As shown in FIG. 2, the aperture grill 5 made of a thin metal plate has a structure in which end portions at both ends in the longitudinal direction of a tape portion 29 alternately arranged with the slits 3 are connected by a continuous portion 31. . In the aperture grill 5, the continuous portions 31, 31 at the upper end and the lower end are seam-welded to the A member 9 of the frame 7.

As shown in FIG. 3, the comb member 23 is mounted on the surface of the continuous portion 31 of the aperture grill 5 stretched on the frame 7. The comb-shaped member 23 can be attached to the continuous portion 31 having only the upper end, the continuous portion 31 having only the lower end, or the continuous portions 31 having both upper and lower ends.

As shown in FIG. 4, the comb-shaped member 23 is formed of a long strip-shaped thin metal plate along the continuous portion 31. The comb member 23 has a comb shape in which a plurality of comb teeth 33 are juxtaposed at one long edge. The pitch of the comb teeth 33 is equal to the pitch of the slits 3 of the aperture grill 5. The width of the comb teeth 33 is formed to be substantially the same as the width of the slit 3.

The comb-shaped member 23 is overlaid on the continuous portion 31 such that the comb teeth 33 coincide with the slits 3. A band-shaped member 25 made of a thin metal plate is superimposed on the surface of the comb-shaped member 23 superimposed on the continuous portion 31. As shown in FIG.
Both ends in the longitudinal direction of the belt-shaped member 25 are fixed to, for example, the B member 11 via a spring 37. That is, the belt-shaped member 25
It is superimposed on the comb-shaped member 23 with tension. As a result, the band-shaped member 25 is interposed between the
3 is held. The vibration damping device 21 does not appear on the image because it is blocked by the belt-shaped member 25.

As shown in FIG. 5, the comb-shaped member 23 held by the band-shaped member 25 has the comb teeth 33 arranged in the slit 3. In the slit 3 according to this example, since both edges of the tape portion 29 adjacent to the slit 3 are inclined surfaces 29a, the horizontal cross-sectional shape is a bowl shape. The comb teeth 33 are arranged in the bowl-shaped slit space without being in contact with the tape portion 29.

In the vibration damping device 21 configured as described above, the vibration of the tape portion 29 is caused by an external input to move in the horizontal direction parallel to the surface of the aperture grill 5 (the direction of arrow X in FIG. 5).
When vibration occurs, the vibration is attenuated by the collision between the tape portion 29 and the comb teeth 33 and the friction between the tape portion 29 and the band-shaped member 25. When the vibration of the tape portion 29 occurs in a direction perpendicular to the surface of the aperture grill 5 (the direction of the arrow Z in FIG. 5), the collision between the tape portion 29 and the band-shaped member 25 and the friction between the tape portion 29 and the comb teeth 33 are performed. As a result, the vibration is attenuated.

According to the above-described vibration damping device 21, the comb-shaped member 23 is held on the continuous portion 31 by the band-shaped member 25, and the comb teeth 33 of the comb-shaped member 23 are arranged in the slit. The vibration of the tape portion 29 can be attenuated by the collision and friction between the tape portion 29 and the comb teeth 33 and the belt-shaped member 25. As a result, vibration of the aperture grill due to an external input can be prevented without using a damper wire.

Further, since the collision / friction damping mechanism is formed by stacking thin metal plates, it is hardly affected by the heat history due to the high temperature in the furnace process of the cathode ray tube, and the damping effect can be obtained even in a vacuum.

Next, a modified example of the vibration damping device according to the present invention will be described. FIG. 6 is a horizontal sectional view of a belt-shaped member and a tape portion showing a modified example of the vibration damping device according to the present invention. In this modified example, a plurality of concave grooves 41 into which the tape portions 29 are respectively formed are formed on the surface of the band-shaped member 25 facing the continuous portion 31 (see FIG. 2). In the same manner as described above, the belt-shaped member 25 has both ends in the longitudinal direction fixed to, for example, the B member 11 (see FIG. 1) via the spring 37 (see FIG. 1).

In this modification, without using the comb-shaped member 23,
By overlapping the belt-like member 25 directly on the continuous portion 31, the groove 4
1, a tape section 29 is arranged. Therefore, the vibration of the tape portion 29 caused by the external input is attenuated by the collision and friction between the tape portion 29 and the inner surface of the concave groove. According to this modification, the comb-shaped member 23 can be omitted, and the same effect as described above can be realized with a small number of parts and a small number of assembly steps.

In the above-described embodiment, the comb-shaped member 2
3 has been illustrated and described as being one having the same overall length as the entire length of the continuous portion 31, but the comb-shaped member is shown in FIG.
As shown in (1), it may be divided into a plurality in the longitudinal direction of the continuous portion 31. In this case, it is desirable that the length of each divided comb-shaped member 51 be a single module unit (one type of common product) or a plurality of module units (two or three types of common product). With such a split type comb-shaped member 51, the number of attachments can be changed to correspond to the aperture grills 5 of different sizes. That is, one kind of comb-shaped member 51 can be used as a common product, and component management can be facilitated.

[0029]

As described above in detail, according to the vibration damping device of the first aspect of the present invention, the comb-shaped member is overlapped on the continuous portion, held by the band-shaped member, and the comb teeth of the comb-shaped member are formed in the slit. , Vibration of the tape section caused by an external input can be attenuated by collision and friction between the tape section, the comb teeth and the band-shaped member. As a result,
Vibration of the aperture grill due to external input can be prevented without using a damper wire.

According to the vibration damping device of the second aspect, a plurality of grooves for receiving the tape portion are formed in the band-shaped member, and the band-shaped member is directly overlapped with the continuous portion without using a comb-shaped member, so that the groove is formed in the groove. Since the tape portion is disposed, the comb-shaped member is omitted, and the attenuation effect of the tape portion can be obtained with a small number of parts and a small number of assembling steps.

According to the vibration damping device of the third aspect, since the comb-shaped member is divided into a plurality of parts in the longitudinal direction of the continuous portion, the number of attachments can be changed to correspond to aperture grills of different sizes. Can be used as a common product to facilitate parts management.

[Brief description of the drawings]

FIG. 1 is a perspective view of a color selection electrode to which a vibration damping device according to the present invention is attached.

FIG. 2 is an explanatory view showing the whole aperture grille and an enlarged portion of one end of a slit thereof.

FIG. 3 is a perspective view of a color selection electrode to which a comb-shaped member is attached.

FIG. 4 is an explanatory view showing the entire comb-shaped member and a comb-teeth enlarged portion thereof.

FIG. 5 is a partial sectional view taken along the line AA in FIG. 1;

FIG. 6 is a horizontal cross-sectional view of a belt-shaped member and a tape portion showing a modified example of the vibration damping device according to the present invention.

FIG. 7 is a front view showing an aperture grill to which a divided comb-shaped member of the vibration damping device according to the present invention is attached.

FIG. 8 is a perspective view showing a conventional color selection electrode.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Color selection electrode, 3 ... Slit, 5 ... Aperture grille, 7 ... Frame, 9 ... A member, 21 ... Vibration damping device, 23 ... Comb member, 25 ... Strip member, 29 ... Tape portion, 31 ... Continuous portion, 33: comb teeth, 41: concave groove

Claims (3)

[Claims] 1. A frame having a pair of elastically supported parallel A members, and ends of both ends in a longitudinal direction of a tape portion formed of a thin metal plate and alternately arranged with slits are connected by a continuous portion. An aperture grille, and the aperture grille is fixed to the pair of A
A vibration damping device for attenuating vibration of the aperture grille of a color selection electrode for a cathode ray tube stretched on a member, comprising a plurality of comb teeth which are superimposed on a surface of the continuous portion and inserted corresponding to each of the slits. A cathode ray, comprising: a formed comb-shaped member; and a band-shaped member that is superimposed on the surface of the comb-shaped member and holds the comb-shaped member between the continuous portion by fixing both ends in the longitudinal direction to the frame. Vibration damping device for tube color selection electrode. 2. A plurality of grooves for receiving the tape portions are formed on a surface of the band-shaped member facing the continuous portion, and the band-shaped member is directly overlapped with the continuous portion without using the comb-shaped member. 2. The vibration damping device for a color selection electrode for a cathode ray tube according to claim 1, wherein said tape portion is arranged in a concave groove. 3. A vibration damping device for a color selection electrode for a cathode ray tube according to claim 1, wherein said comb-shaped member is divided into a plurality in a longitudinal direction of said continuous portion.