JP3104101B2 - Method of manufacturing color selection mask for color cathode ray tube, color selection mask for color cathode ray tube, and color cathode ray tube - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a color selection mask for a color cathode ray tube, and a color selection mask and a color cathode ray tube for a color cathode ray tube manufactured by the method.

[0002]

2. Description of the Related Art A color cathode ray tube (CRT) causes a color shift due to thermal expansion caused by a scanning electron beam. As a measure against this,
A color selection mask to which invar material and tension are added is used.

The color selection mask of this color CRT is made of metal, and two methods for manufacturing the color selection mask are known, one using thermal expansion and one using frame pressing.

[0004] The first method utilizing thermal expansion is described in Zen.
It is an ith company's FTM manufacturing method, which utilizes the difference in thermal expansion between a metal mask and a ceramic frame, and assembles it at a high temperature and applies tension as the metal shrinks at room temperature.

The second method using the pressurizing method of the frame employs a trinitron tube color selecting mechanism aperture grill (A).
G). FIG. 3 is a perspective view showing an example of a trinitron AG manufactured by this method. In this method, as shown in the Trinitron AG manufacturing flowchart of FIG. 4, after mask positioning, scissors (chucking) are applied to the upper and lower surfaces of the mask on an R surface called OTEIKO, tension is applied, and after R molding by frame positioning, the frame Pressurization is performed, and the mask is welded and fixed to the pressurized frame. In this manner, the mask 11 having the aperture grill 11a is stretched over the frame 4. In the drawing, reference numerals 5 and 6 denote springs and spring holders for locking the frame on which the mask is formed to the CRT panel.

[0006]

The first method utilizing thermal expansion requires a large-scale facility for assembling a mask and a frame at a high temperature, a long index, and installation of a ceramic frame in a panel. It is difficult to obtain accuracy.

In the second method using the frame pressing method, it is extremely difficult to manufacture the above-mentioned R-face called an "Oitako" with high accuracy. More. In addition, magnetic leakage occurs because the space (side surface) between the frame and the mask is open.

Therefore, the present invention provides a method for manufacturing a color selection mask for a color cathode ray tube, which can simplify the equipment and improve the drift characteristics of the cathode ray tube, and a color selection mask for a color cathode ray tube manufactured by the manufacturing method. It is an object of the present invention to provide a color cathode ray tube.

[0009]

According to the present invention, a method of manufacturing a color selection mask for a color cathode ray tube according to the present invention is provided on a first rectangular metal frame having a pair of opposed metal plates having substantially the same curve formed at the upper end. Arranging a rectangular mask having a grid for a color cathode ray tube and a second rectangular metal frame composed of two sets of metal plates facing each other substantially in parallel with the first rectangular metal frame; after positioning the mask, Gripping both opposing end portions and applying a tensile force, positioning the first and second rectangular metal frames, and then moving the first rectangular metal frame in the direction of the mask to move the mask into the first rectangular shape. A step of stretching the metal frame, a step of fitting the second rectangular metal frame to the first rectangular metal frame on which the mask is stretched as an outer frame, and It is characterized in that it comprises the step of welding the metallic frame.

[0010] A color selection mask for a color cathode ray tube according to the present invention comprises a first rectangular metal frame having a pair of opposed metal plates having substantially the same curve formed at the upper end, and a rectangular mask having a grid for a color cathode ray tube. And a second rectangular metal frame composed of two sets of metal plates facing each other, wherein the peripheral edge of the mask is fitted by fitting the second rectangular metal frame as an outer frame to the first rectangular metal frame on which the mask is stretched. The part is welded to the first rectangular metal frame. In the color cathode ray tube according to the present invention, a rectangular mask having a grid for a color cathode ray tube is stretched on a first rectangular metal frame having a pair of opposed metal plates having substantially the same curve formed at an upper end thereof. A color selection mask for a color cathode ray tube is provided in which a second rectangular metal frame is fitted as an outer frame to the first rectangular metal frame on which a mask is stretched, and a peripheral portion of the mask is welded to the first rectangular metal frame. It is characterized by the following.

[0011]

In the method of manufacturing a color selection mask for a color cathode ray tube according to the present invention, a rectangular mask and a second rectangular metal frame are arranged substantially in parallel on a first rectangular metal frame, and the mask is positioned. After applying force and then positioning the first and second rectangular metal frames, the first rectangular metal frame is moved in the direction of the mask to stretch the mask over the first rectangular metal frame, and the first rectangular metal frame is stretched. The second rectangular metal frame is fitted to the rectangular metal frame as an outer frame, and the periphery of the mask is welded to the first rectangular metal frame. In the color selection mask for a color cathode ray tube according to the present invention, the first rectangular metal frame on which the mask is stretched is fitted with the second rectangular metal frame as an outer frame, and the peripheral edge of the mask is welded to the first rectangular metal frame. Unlike the conventional case, the space between the metal frame and the mask is not opened, and no magnetic leakage occurs. In the color cathode ray tube according to the present invention, the first
A color selection mask for a color cathode-ray tube in which a second rectangular metal frame is fitted as an outer frame to a rectangular metal frame and a peripheral portion of the mask is welded to the first rectangular metal frame. As described above, the space between the metal frame and the mask is not open, and no magnetic leakage occurs.

[0012]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a schematic perspective view for explaining an embodiment of the present invention.

As shown in FIG. 1A, the method of the present invention comprises a mask 1 having a cathode ray tube (especially a trinitron tube) color selection mechanism aperture grill (AG) 1a, a curvature R
Steel plate 21 having the curve of
A rectangular frame 2a composed of two rectangular steel plates 22 and a rectangular frame 2b composed of four rectangular steel plates 25 are used.

FIG. 2 shows a flowchart of the method.

In this method, first, the mask 1 is positioned for assembly by, for example, four pin holes (not shown), and is fixed by a mechanical chuck system.

Next, light tension is applied to the mask 1 in the direction of arrow A in FIG. After the positioning of the frame 2a (set on the lower side) and the frame 2b (set on the upper side) is completed, the frame 2a is brought closer to the mask 1 (raised), and
After “a” comes into contact with the mask 1, the frame 2 a is further raised and the mask 1 is stretched so that the curvature R of the frame 2 a is surely adjusted. On the other hand, the upper frame 2b is lowered toward the mask 1 and fitted to the frame 2a covered by the mask 1. At this time, the tension of the mask 1 is adjusted by raising and lowering the fitting position of the frame 2b to the frame 2a while holding and fixing the mechanical chuck portion holding the mask 1 in the chuck state.

Next, in order to fix the mask 1 to the frame 2a, the mask peripheral portion 1b (peripheral portion) is
a and the frame 2b is welded to the mask 1 (FIG. 1 (b)). At this time, the spring 5 can be directly welded to the frame 2a, and a spring support holder is unnecessary. The above-mentioned welding raises the frame 2a and raises the mask 1
May be partially performed in advance at the time when is covered.

[0019]

As described above, according to the present invention, assembling can be performed at room temperature, and since an Oitaco, which is difficult to produce an R-plane due to accuracy, is not used, equipment can be simplified.

Further, since a frame formed of a plate material can be used as the frame, there is no magnetic leakage unlike the conventional trinitron frame.

Further, since it is not necessary to trim the peripheral portion after welding the mask, the workability is good.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view for explaining one embodiment of the present invention.

FIG. 2 is a flowchart of the embodiment.

FIG. 3 is a perspective view showing a conventional Trinitron aperture grill (AG).

FIG. 4 is a manufacturing flowchart of a conventional trinitron AG.

[Explanation of symbols]

 1,11 Mask 1a, 11a Aperture grill 1b Mask peripheral edge 2a, 2b, 4 Frame 5 Spring 6 Spring holder 21 Steel plate 22,25 Rectangular steel plate

Claims (4)

(57) [Claims] 1. A rectangular mask having a grid for a color cathode ray tube and a pair of metal plates facing each other on a first rectangular metal frame having a pair of metal plates facing each other and having substantially the same curve formed on an upper end thereof. Arranging a second rectangular metal frame substantially parallel to the first rectangular metal frame, comprising: positioning the mask, gripping opposite end portions of the mask, and applying a tensile force; After positioning the second rectangular metal frame,
Moving the first rectangular metal frame in the mask direction to stretch the mask on the first rectangular metal frame; and moving the second rectangular metal frame on the first rectangular metal frame on which the mask is stretched.
A method for manufacturing a color selection mask for a color cathode ray tube, comprising: a step of fitting a rectangular metal frame as an outer frame; and a step of welding a peripheral portion of the mask to the first rectangular metal frame. 2. The color cathode ray tube for a color cathode ray tube according to claim 1, wherein welding of the peripheral portion of the mask to the first rectangular metal frame is partially performed after the mask is stretched on the first rectangular metal frame. Manufacturing method of color selection mask. 3. A first rectangular metal frame having a pair of opposed metal plates having substantially the same curve formed at the upper end, a rectangular mask having a grid for a color cathode ray tube, and two opposed metal plates. A second rectangular metal frame comprising: a first rectangular metal frame on which the mask is stretched;
A color selection mask for a color cathode ray tube, wherein a rectangular metal frame is fitted as an outer frame and a peripheral portion of the mask is welded to the first rectangular metal frame. 4. A rectangular mask having a grid for a color cathode ray tube is stretched on a first rectangular metal frame having a pair of opposed metal plates having substantially the same curve formed at an upper end thereof.
The second rectangular metal frame on which the mask is
A color cathode-ray tube comprising a color selection mask for a color cathode-ray tube in which a rectangular metal frame is fitted as an outer frame and a peripheral portion of the mask is welded to the first rectangular metal frame.