JPH10134729A - Color selection device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent generation of a morel strip on a screen by damping an aperture (color selection electrode) due to a damper wire employed for a color selection device of a cathode-ray tube. SOLUTION: A spring 6 holding a damper line 4 arranged so as to be orthogonal to a longitudinal direction with a grid element body 3 of an aperture grill 1 attached to a frame 9 constituting a color selection device 10 is fixed to a longitudinal arm 5 of the frame 9, the spring 6 is laminated as a spring constitution, and a resonance frequency is damped during damper line resonance.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a mounting structure of a damper wire for buffering a grid element used for a color selection electrode of a color selection device for a cathode ray tube.

[0002]

2. Description of the Related Art Conventionally, a cathode ray tube (hereinafter referred to as CRT).
A device using a shadow mask as a color sorting device,
A color selection electrode (hereinafter referred to as AG) 1 using a mask called an aperture grill is known. As shown in FIG. 5, the AG 1 has a large number of linear grid elements 3 stretched at a predetermined pitch between a pair of horizontal arms 2 forming a frame.

A vertical arm 5 is fixed between the horizontal arms 2 so as to bridge both side ends thereof to form a frame, which is formed on the inner surface of a panel of a glass tube of a CRT (not shown). A leaf spring for fitting to the pin is fixed.

On the upper surface of the grid element 3 of the AG 1, the grid element 3 resonates due to vibration from the outside and causes color shift.
In order to prevent the image quality from deteriorating, a damper wire 4 composed of a tungsten wire of about 25 μm is fixed to a pair of vertical arms 5 so as to apply an appropriate tension so as to be perpendicular to the longitudinal direction of the grid element 3. As shown in the figure, the damper wire 4 is stretched between a pair of springs 6 and 6 and the damper wire 4 is locked by a seal welding or the like via a thin band 7 of stainless steel or the like.

[0005]

As described above, the grid element body 3 of the AG 1 on which the damper wire 4 is stretched can buffer the resonance against a predetermined frequency vibration from the outside. When an external vibration that matches the resonance frequency of the damper wire 4 is given,
A resonance occurs as shown in the direction of arrow AA 'of FIG.

When such a resonance in the direction in which the damper wire 4 is stretched occurs, the grid element body 3 of the AG 1 that is in contact with the damper wire 4 is displaced, and the light and darkness on the CRT screen 12 is as shown in FIG. There is a problem that moiré fringes 11 occur.

An object of the present invention is to provide a color selecting device which solves the above-mentioned problems, and a problem to be solved is a color selecting device which can suppress the resonance of the damper wire in the extending direction. It is intended to obtain a sorting device.

[0008]

As shown in FIG. 1, a color selection device according to the present invention comprises a frame 9 on which a color selection electrode 1 composed of a plurality of grid elements 3 is stretched. In a color selection device 10 comprising a damper wire 4 which is fixed to a pair of springs 6 fixed to 9 and is stretched so as to be orthogonal to the plurality of grid elements 3 of the color selection electrode 1, the spring 6 has resonance. It is formed by overlapping a plurality of spring pieces having different points.

According to the color selection device of the present invention, a device that does not generate moire fringes on the screen when the damper wire 4 resonates can be obtained only by forming the spring 6 that stretches and locks the damper wire as an overlapping spring. .

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a color selection device used for a CRT according to the present invention will be described below in detail with reference to FIGS.
FIG. 1 is a perspective view of a color selection device of the present invention, FIG. 2 is a perspective view of a spring used in the present invention, and FIG. 3 is a side sectional view showing one embodiment of a spring used in the present invention.

FIG. 1 shows a color sorting apparatus according to the present embodiment, in which a pair of L-shaped cross arms 2 made of stainless steel or the like have a pair of L-shaped cross arms 2 and a vertical arm 5 having a square bar bent at both ends between the two arms. Are welded so as to form a bridge, thereby forming a frame 9 having a square-shaped steel frame.

A color selection electrode in which a vertical stripe-shaped grid element body 3 is formed between the horizontal arms 2 of the frame 9 by an etching method;
That is, the aperture grill (AG) 1 is welded with an appropriate tension.

[0013] 1mm ² per 1 in this grid element 3
Consideration is given so that a tension of 0 kg or more is applied to prevent vibration due to external vibration.

A pair of vertical arms 5 and 5 constituting the frame 9
The spring 6 is fixed to the
And two damper wires 4 and 4 on the side close to the side arms 2 and 2
2 is stretched between the springs 6 and 6 as shown in FIG.

The damper lines 4 and 4 are formed so as to be orthogonal to the longitudinal direction of the grid element 3 of the AG 1 and to be in contact with the grid element and the damper line 4.

The springs 6 and 6 according to the present invention are shown in FIG.
The perspective view and is composed of a leaf-shaped spring 6 for retaining the damper lines 4 and 4 as shown in the side sectional view of FIG. 3, the fixing portion 6 ₁ Toko for fixing both ends of the vertical arm 5 and 5 a fixing portion ₆₁ curved portion 6 ₂ which is convexly curved and extends to, the bending portion 6 ₂ is extended is composed of the horizontal portion 6 ₃ bent so as to perpendicular to the frame 9 direction, the spring mutually curved portion ₆₁ of a plurality of different length spring pieces 6a to 6, 6b, 6c ‥‥ are sequentially stacked to constitute a lap spring.

The spring pieces 6a, 6b, 6c ‥‥ is a plate-shaped fixing portion ₆₁ of the respective constant thickness t, made of curved portions 6 ₂ curved in convex and extend into the fixed portion _61, the curved portion the length of the 6 ₂ is made with each _{l 1 ≠ l 2 ≠ l 3} , the fixed portion ₆₁ is fixed by screws or point welding to the vertical arm 5, the bending portion 6 ₂ is made and the mutually free state ing. Resonance frequency at the resonance point by external vibration of the damper line 4 by mutually occurring frictional resistance component between the curved portion 6 ₂ is rapidly becomes a possible damping.

In the above configuration, the springs 6a, 6b, 6c # are arranged between the spring 6 for locking the damper wire 4 and the vertical arm 5 forming the frame 9, but the spring fixing portion 6 _{1 is provided.} Is fixed directly to the vertical arm 5 and this spring 6
A plurality of spring pieces 6a, 6
b, and the free curved portion 6 ₂ 6c ‥‥, the fixed portion ₆₁
The may form so as to secure together the fixed portion ₆₁ of the spring 6.

[0019] Figure 4 shows another configuration example of a rack-clad spring 6 of the damper line 4 for use in the color selection device of the present embodiment, the spring piece 6a in FIG. 3, 6b, bending section 6 ₂ of 6c ‥‥
The lengths l ₁ , l ₂ , l ₃ } are sequentially changed to keep the plate thickness t constant, but as shown in FIG. 4, the spring pieces 6c, 6d, 6e
The thickness of ‥‥ may be changed to control the damping characteristics at the time of resonance. In this case, even in the manner sequentially changing the bending portion 6 a length of ₃ free portion, or that the length may be as varied only thickness is constant is obvious.

As described above, according to the color selection device of the present invention, it is possible to prevent the AG fluctuation due to the resonance phenomenon of the damper wire itself and to obtain a CRT free from moire fringes.

After the damper wire is stretched by the color sorting apparatus, frit sealing and exhausting are performed by a hot gas furnace at about 350 ° C. to 450 ° C. According to the lap spring configuration, such high temperature heat treatment is not possible. And a simple structure that does not increase the number of assembling steps.

[0022]

According to the color selecting apparatus of the present invention, it is possible to provide a CRT with a simple structure in which moire fringes caused by the shaking of the AG grid element caused by the damper line do not occur.

[Brief description of the drawings]

FIG. 1 is a perspective view of a color sorting device of the present invention.

FIG. 2 is a perspective view of a spring used in the color selection device of the present invention.

FIG. 3 is a side sectional view showing one embodiment of a spring used in the color selection device of the present invention.

FIG. 4 is a side sectional view showing another embodiment of the spring used in the color selection device of the present invention.

FIG. 5 is a perspective view of a conventional color selection device.

FIG. 6 is a perspective view of a spring used in a conventional color selection device.

FIG. 7 is an explanatory diagram of a pattern generated on a screen generated by a damper line of a conventional color selection device.

[Explanation of symbols]

1 aperture grill (AG), 2 horizontal arms, 3 grid bodies, 4 damper wires, 5 vertical arms, 6 springs, 6
a, 6b, 6c ‥‥ Spring piece, 7 thin ribbon, 9 frames, 10 color sorting device

Claims (3)

[Claims] A color selection electrode composed of a plurality of grid elements is stretched over a frame, is engaged with a pair of springs fixed to the frame, and is orthogonal to the plurality of grid elements of the color selection electrode. A color selection device comprising a stretched damper wire, wherein the spring is formed by overlapping a plurality of spring pieces having different resonance points. 2. The color sorting device according to claim 1, wherein a spring in which the plurality of spring members are overlapped damps vibration in the direction in which the damper wire extends. 3. The color selection device according to claim 1, wherein the spring members are formed of spring members having different lengths and / or thicknesses.