JPH11111186A - Color picture tube and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a color picture tube and a manufacturing method in which the welding strength of the shadow mask does not decrease even when the shadow mask is blackened with the holder attached. SOLUTION: A shadow mask composed of a mask body and a mask frame 25 attached to a peripheral portion thereof is supported by a holder 15 fixed to the mask frame and detachably engaged with a stud pin provided on a panel. In a color picture tube made of metal of a different material from the mask frame, a metal plate 27 of the same material as the mask frame is interposed between the mask frame and the holder, and this metal plate is fixed to the mask frame by welding. The holder was fixed to the metal plate by mechanical means.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color picture tube and a method of manufacturing the same, and more particularly to a color picture tube in which reuse of a recovered shadow mask is stabilized and a method of manufacturing the same.

[0002]

2. Description of the Related Art In general, a color picture tube has an envelope comprising a panel and a funnel-shaped funnel having a cylindrical neck at one end, and a phosphor screen provided on the inner surface of the panel. The shadow mask is arranged opposite to and at a predetermined distance from the inside of the panel by detachably locking a holder fixed by welding to a mask frame of the shadow mask to be described later to a stud pin provided on the panel. It is supported by. On the other hand, an electron gun is arranged in the neck of the funnel. The three electron beams emitted from the electron gun are deflected by a magnetic field generated by a deflection yoke mounted outside the funnel, and the phosphor screen is horizontally and vertically scanned through the shadow mask, so that a color image is obtained. Is formed in a structure for displaying.

As shown in FIG. 6, the shadow mask has a mask body 1 in which a large number of electron beam passage holes are formed in a predetermined arrangement on a surface facing a phosphor screen. Mounted mask frame 2
Consists of The mask body 1 is made of a cold-rolled steel plate such as aluminum-killed steel or a low thermal expansion material such as amber, and the mask frame 2 is made of a cold-rolled steel plate. An oxide film is formed. On the other hand, the holder 5 that detachably supports the shadow mask 3 is made of stainless steel having stable elasticity.

Conventionally, as shown in FIGS. 7 and 8, such a shadow mask 3 is obtained by subjecting a mask frame 2 formed into a predetermined shape to a blackening process to form a black oxide film, and then forming a black oxide film. The holder 5 is welded to the mask frame 2 on which the oxide film has been formed. Thereafter, the mask body 2 is formed into a predetermined shape on the mask frame 2 to which the holder 5 is welded, and then, similarly to the mask frame 2, is manufactured by welding the mask body 1 on which a black oxide film is formed by a blackening process. I have.

In general, when a color picture tube becomes defective after the production process or after the production is completed, the color picture tube is disassembled to take out usable parts and to reuse the same. A shadow mask is one of the components that can be reused.

In particular, when the shadow mask is reused, it is taken out of the panel and then kept in the temperature range of 580 to 600 ° C., preferably 600 ° C. in order to obtain a stable black oxide film with the holder 5 attached. It is subjected to blackening treatment at a temperature of and used for reuse.

[0007]

As described above, the shadow mask incorporated in the color picture tube is formed by blackening a mask frame made of a cold-rolled steel plate to form a black oxide film. It is manufactured by welding a holder made of stainless steel and then welding a mask body which has been previously blackened to the mask frame to which the holder is welded.

On the other hand, when a color picture tube becomes defective after the production process or after the production is completed, the color picture tube is disassembled to take out usable parts and to reuse them.
The shadow mask is one of the parts. Particularly, in the case of the recovered shadow mask that has been taken out, a temperature range of 580 to 600 ° C., preferably a stable black oxide film, is obtained while the holder is attached. It is blackened again at a temperature of ° C. and is reused.

[0009] However, if the black mask is treated at a temperature of about 600 ° C. with the holder attached in order to reuse the shadow mask collected as described above, the welding strength of the holder decreases, and the holder falls off when reused. Sometimes.

That is, since the blackening temperature of 600 ° C. is an area where the material of the holder made of stainless steel is changed, as shown in FIG.
And the welding nugget part 7 of the holder 5 causes a structural change,
The welding nugget 7 is peeled off, and the holder 5 is likely to fall off.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and a color picture tube in which the welding strength of a holder does not decrease even if blackening is performed to reuse a recovered shadow mask, and a method of manufacturing the same. The purpose is to obtain.

[0012]

[Means for Solving the Problems]

(1) A shadow mask comprising a mask main body provided on the inner surface of the panel and facing the phosphor screen and a mask frame attached to a peripheral portion of the mask main body, wherein the shadow mask is fixed to the mask frame and the panel is fixed. In a color picture tube made of metal of a different material from the mask frame, the holder is supported by a holder that detachably locks to the stud pin provided on the
A metal plate of the same material as the mask frame was interposed between the mask frame and the holder, this metal plate was welded to the mask frame, and the holder was fixed to the metal plate by mechanical means.

(2) In the color picture tube of (1),
The mask frame and metal plate are made of cold-rolled steel plate,
The holder was made of stainless steel.

(3) In the color picture tube of (1) or (2), the holder is fixed to a metal plate by caulking.

(4) In the color picture tube of (3),
The metal plate was provided with a projection, the holder was provided with an opening for fitting the projection, and the projection was caulked to the opening.

(5) A shadow mask including a mask main body provided on the inner surface of the panel and facing the phosphor screen and a mask frame attached to a peripheral portion of the mask main body. In a method for manufacturing a color picture tube made of metal different from the mask frame, the holder is fixed to the mask frame and is supported by a holder which is detachably locked to a stud pin provided on the panel. A metal plate made of a material was welded, and the holder was fixed to the metal plate by mechanical means.

(6) In the method for manufacturing a color picture tube of (5), after a metal plate is welded to the mask frame, the holder is fixed to the metal plate by mechanical means.

(7) In the method for manufacturing a color picture tube according to (6), a projection is provided on the metal plate, an opening is provided in the metal plate for fitting the projection, and the projection is inserted through the opening. The lever projection was swaged.

[0019]

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

FIG. 1 shows a color picture tube which is one embodiment of the present invention. This color picture tube has a substantially rectangular panel 10,
One end has an envelope formed of a funnel-shaped funnel 12 formed of a cylindrical neck 11 having a small diameter. Panel 1
A phosphor screen 13 made of a three-color phosphor layer that emits blue, green, and red light is provided on the inner surface of 0. A substantially rectangular shadow mask 14 (described later), which faces the phosphor screen 13 and is separated by a predetermined distance, is attached to and detached from a stud pin 16 provided on the panel 10 by a holder 15 attached to a mask frame described later. By locking as much as possible, it is supported inside the panel 10. On the other hand, an electron gun 18 for emitting three electron beams 17B, 17G and 17R is arranged in the neck 11 of the funnel 12. A magnetic shield 20 attached to the mask frame is arranged inside the large diameter portion 19 of the funnel 12. The three electron beams 17B, 17G, 17R emitted from the electron gun 18 are applied to the funnel 12
It is formed to have a structure in which a color image is displayed by deflecting by a magnetic field generated by a deflection yoke 21 mounted on the outside and horizontally and vertically scanning the phosphor screen 13 via a shadow mask 14.

As shown in FIG. 2, the shadow mask 14 has a substantially rectangular mask body 24 having a large number of electron beam passage holes formed in a predetermined arrangement on a surface 23 facing the phosphor screen. It comprises a substantially rectangular mask frame 25 attached to the periphery of the main body 24. The mask body 24 is made of a cold-rolled steel plate such as aluminum-killed steel or a low-thermal-expansion material such as amber.
5 is made of a cold-rolled steel plate, and a black oxide film is formed on the surfaces of the mask body 24 and the mask frame 25.

On the other hand, the holder 15 for supporting the shadow mask 14 is made of stainless steel.

In particular, in this embodiment, as shown in FIG. 3, the mask frame 2 made of the cold-rolled steel plate is used.
5, a metal plate 27 of the same material as the mask frame 25;
(Cold rolled steel plate) is welded, and the holder 15 is fixed by mechanical means via the metal plate 27. In particular, in the example shown in FIG.
7 is formed by caulking two projections 28 provided on the holder 7 into openings provided on the holder 15.

The metal plate 27 is formed to have substantially the same size as the mask frame fixing portion 29 (shown in FIG. 2) of the holder 15. The thickness t of the metal plate 27 is, for example, 1.2 mm for the mask frame 22 and the holder 1
When the plate thickness of No. 5 is 0.76 mm, it is set to 0.5 mm.

To assemble the shadow mask 14 as described above, the mask frame 25 formed into a predetermined shape is attached to the shadow mask 580.
After forming a black oxide film on the surface by performing a blackening treatment at ~ 600 ° C, as shown in FIG. 4, it is formed to have substantially the same size as the mask frame fixing portion 29 of the holder 15, and a protrusion is formed by deep drawing. The metal plate 29 formed with 28 is welded. Then, as shown in FIG. 5, an opening 30 (shown in FIG. 4) provided in the mask frame fixing portion 29 is fitted into the projection 28 of the metal plate 27, and the tip of the projection 28 is crushed and caulked. Then, the holder 15 is fixed to the metal plate 27. Next, the mask frame 25 to which the holder 15 is fixed
Then, the mask main body 24 having a black oxide film formed on a surface thereof, which is formed into a predetermined shape and subjected to a blackening treatment in the same manner as the mask frame 25, is welded.

As described above, the metal plate 27 of the same material is welded to the mask frame 25 made of a cold-rolled steel plate, and the holder 15 made of stainless steel for supporting the shadow mask 14 is mounted on the metal plate 27 by mechanical means. Once fixed, the recovered shadow mask 14 taken out of the defective color picture tube is reused. Therefore, even if the blackening process is performed with the holder 15 attached, the holder is directly mounted on the mask frame like a conventional shadow mask. It is possible to prevent the holder from falling off due to a decrease in welding strength caused by welding.

That is, as described above, when the metal plate 27 is interposed between the mask frame 25 and the holder 15 and the mask frame 25 and the metal plate 27 are welded, the mask frame 25 and the metal plate 27 become Since they are made of the same material, even if they are blackened at a temperature of about 600 ° C., the welding strength does not decrease. On the other hand, holders 1 of different materials
5 is fixed to the metal plate 27 by mechanical means,
It is possible to prevent the holder from falling off due to a decrease in welding strength as in a conventional shadow mask.

Even if the number of parts is increased by using the metal plate 27, the same material as the mask frame 25 is used.
In addition, since the structure is simple, the cost does not increase.

In the above-described embodiment, the holder is fixed to the metal plate by caulking, but the holder may be fixed by other means as long as it is mechanical means.

[0030]

As described above, when a metal plate of the same material as the mask frame is welded to the mask frame and the holder for supporting the shadow mask is fixed to the metal plate by mechanical means, the recovered shadow mask can be reused. To do
Even if the blackening process is performed with the holder attached, the holder can be prevented from falling off due to a decrease in welding strength unlike a conventional shadow mask, and the recovered shadow mask can be reused stably.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration of a color picture tube according to an embodiment of the present invention.

FIG. 2A is a plan view showing a configuration of a shadow mask of the color picture tube, and FIG. 2B is a front view shown in cross section.

FIG. 3 is a view showing a structure for attaching a holder to a mask frame of the shadow mask.

FIG. 4 is a diagram for explaining a method of attaching a holder to the mask frame.

FIG. 5 is a view for explaining a method of attaching a holder to the mask frame.

FIG. 6 is a diagram showing a configuration of a conventional shadow mask of a color picture tube.

FIG. 7 is a view for explaining a method of manufacturing the conventional shadow mask for a color picture tube.

FIG. 8 is a view for explaining a method of manufacturing the conventional shadow mask for a color picture tube.

FIG. 9 is a view for explaining a problem when a holder is directly welded to a mask frame of a conventional color picture tube.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Panel 13 ... Phosphor screen 14 ... Shadow mask 15 ... Holder 16 ... Stud pin 24 ... Mask main body 25 ... Mask frame 27 ... Metal plate 28 ... Projection part 30 ... Opening

Claims (7)

[Claims] 1. A shadow mask comprising a mask main body provided on an inner surface of a panel and facing a phosphor screen, and a mask frame attached to a peripheral portion of the mask main body. In a color picture tube made of a metal different from the mask frame, the holder is supported by a holder which is fixed and is detachably engaged with a stud pin provided on the panel, wherein the holder is provided between the mask frame and the holder. A metal plate of the same material as that of the mask frame, and the metal plate is welded to the mask frame, and the holder is fixed to the metal plate by mechanical means. 2. The color picture tube according to claim 1, wherein the mask frame and the metal plate are made of a cold-rolled steel plate, and the holder is made of a stainless steel plate. 3. The color picture tube according to claim 1, wherein the holder is fixed to the metal plate by caulking. 4. The metal plate according to claim 3, wherein said metal plate is provided with a projection, said holder is provided with an opening for fitting said projection, and said opening is swaged with said projection. Color picture tube. 5. A shadow mask comprising a mask body provided on an inner surface of a panel and facing a phosphor screen and a mask frame attached to a peripheral portion of the mask body, wherein the shadow mask is provided on the mask frame. In a method for manufacturing a color picture tube made of a metal different from the mask frame, the holder is fixed and supported by a holder detachably engaged with a stud pin provided on the panel. A method for manufacturing a color picture tube, comprising welding a metal plate of the same material as a frame and fixing the holder to the metal plate by mechanical means. 6. The method according to claim 5, wherein after the metal plate is welded to the mask frame, the holder is fixed to the metal plate by mechanical means. 7. A metal plate having a projection, an opening for fitting the projection in the holder, and the projection being inserted into the opening and caulking the projection. Item 7. The method for producing a color picture tube according to Item 6.