JPH0757623A - Manufacture of color picture tube - Google Patents

Abstract

PURPOSE:To provide a color picture tube to regenerate images of excellent grade having no overlapping or disconnection between the images drawn in each zone. CONSTITUTION:In a manufacturing method of a color picture tube in which a fluorescent screen formed on an inner surface of a face plate of a substantially rectangular form are separated into plural zones to be scanned through plural separation masks by electron beams emitted from plural electron guns, the separation masks M1-M5 disposed in parallel through slit parts are integrally connected to each other by connection parts 18 through half etching parts 17. Simultaneously, a shadow mask 9a having positioning holes 19 at connection parts at both end parts is formed, and this shadow mask is engaged with positioning pins installed on a rear plate or the face plate. Each separation mask M1-M5 is then welded with a mask installation means to be fixed.

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 picture tube, and more particularly, it comprises a plurality of divided masks facing a phosphor screen formed on the inner surface of a substantially rectangular face plate. The present invention relates to a method for manufacturing a color picture tube in which a shadow mask is arranged.

[0002]

2. Description of the Related Art In recent years, various studies have been made on high-definition broadcasting or a high-resolution picture tube having a large screen accompanying the broadcasting. Generally, in order to achieve high resolution of the picture tube, the spot diameter of the electron beam on the phosphor screen must be reduced.

On the other hand, conventionally, the electrode structure of the electron gun has been improved, or the electron gun itself has been increased in diameter and length, but sufficient results have not yet been obtained. The main reason for this is that as the tube becomes larger, the distance from the electron gun to the phosphor screen becomes longer and the magnification of the electron lens becomes too large. Therefore, in order to achieve high resolution, it is important to reduce the distance (depth) from the electron gun to the phosphor screen.
Further, in this case, wide-angle deflection causes an increase in the difference in magnification between the center and the periphery of the screen. Therefore, wide-angle deflection is not a good idea for high resolution.

As a picture tube having the above-mentioned large screen and having a short depth and a high resolution, there is disclosed in Japanese Unexamined Patent Publication No. 5-36363.
In the publication, a face plate is flattened, and a phosphor screen having an integral structure formed on the inner surface of the face plate is divided into a plurality of regions and scanned by an electron beam emitted from a plurality of electron guns. A picture tube is shown.

Further, a color picture tube which is divided into a plurality of regions and is scanned by an electron beam emitted from a plurality of electron guns facing a phosphor screen having an integrated structure formed on the inner surface of a flat face plate. As a method, a shadow mask arranged facing the phosphor screen is composed of a plurality of divided masks, and these divided masks are attached to a mask erection means fixed to a flat rear plate facing the face plate. Has been done.

In these picture tubes, the images drawn in the respective areas by the divisional scanning of the electron beam are connected by a signal applied to an electron gun or a deflecting device for deflecting the electron beam, and are overlapped on the phosphor screen having an integrated structure. It is designed to reproduce seamless images. However, especially in this color picture tube, in order to reproduce an image without overlap or break on the phosphor screen as described above, the division masks are accurately set in a predetermined relationship corresponding to each region, and The distance between the body screen and each divided mask must be accurately set to a predetermined value.

That is, a phosphor screen for a normal color picture tube is formed by a photoprinting method using a shadow mask incorporated in the color picture tube to form a phosphor screen such as a phosphor slurry applied on the inner surface of the face plate. It is formed by exposing the member layer. in this case,
Distance between shadow mask and inner face plate (q
If the value) deviates from a predetermined value, the arrangement interval of the phosphor layers forming the phosphor screen is affected, but the continuity over the entire phosphor screen is not affected. However, in a color picture tube in which a phosphor screen having an integrated structure is divided into a plurality of regions for scanning, the shadow mask is divided and scanned by an electron beam in an effective portion where a large number of electron beam passage holes are formed. The phosphor screen is discontinuously formed corresponding to the plurality of regions through the non-effective portion in which the electron beam passage hole is not formed, so that the phosphor screen is affected by the q value between the adjacent regions. That is, when the q value is larger than the predetermined value, the phosphor layers overlap each other between adjacent regions, and when the q value is smaller than the predetermined value, a gap is formed between the phosphor layers between the adjacent regions. Even when the phosphor screen is formed by a master mask formed by using a photomask or a dry plate, in the color picture tube which divides the phosphor screen of the integrated structure into a plurality of regions and scans, it is similarly adjacent. Rasters may overlap or breaks between areas.

By the way, in the manufacture of a color picture tube in which a phosphor screen having an integral structure formed on the inner surface of the above-mentioned flat face plate is divided into a plurality of regions and scanned, the face plate of the face plate is previously manufactured by a photo printing method. A phosphor screen is formed on the inner surface. Also, after manufacturing a shadow mask in which a plurality of effective portions are connected through ineffective portions by a photo etching method, the shadow mask is divided into a plurality of divided masks, or the divided masks are formed by a photo etching method from the beginning. To manufacture. on the other hand,
For a plurality of mask erection means for attaching the divided mask to the rear plate, and the atmospheric pressure load applied to the flat face plate and the flat rear plate of the vacuum envelope,
A plate supporting means for supporting the face plate and the rear plate is fixed. Then, the divided mask manufactured as described above is welded to the mask erection means fixed to this rear plate. Further, the electron guns are sealed in the necks of the funnels.

Next, the face plate on which the phosphor screen is formed, the side wall, the rear plate on which the split mask mask is attached, and the plurality of funnels sealed by the electron gun are positioned and arranged in a predetermined relationship, and these are arranged. Assembled integrally by applying and firing frit glass. afterwards,
It is manufactured by evacuating the integrally assembled envelope.

However, in the method of individually mounting a plurality of divided masks on the mask erection means as in the method of manufacturing a color picture tube, all the divided masks are divided in correspondence with the area to be divided and scanned by the electron beam. It is extremely difficult to accurately set the interval between the phosphor screen and the phosphor screen, and overlaps and breaks are likely to occur between images drawn in adjacent regions.

[0011]

As described above, a plurality of divided masks are arranged so as to face the phosphor screen having the integrated structure formed on the inner surface of the flat face plate, and the plurality of divided masks are arranged to face each other. By the emitted electron beam,
In a color picture tube that scans the phosphor screen by dividing it into a plurality of areas through the effective part of each division mask, the images drawn in each area are continuously connected, and there is no overlap or break on the phosphor screen. In order to reproduce the image, all division masks must be accurately set in correspondence with the area to be divided and scanned by the electron beam, and the interval with the phosphor screen must be set accurately to a predetermined value. is necessary.

However, in the method of manufacturing the color picture tube, a plurality of divided masks are formed in advance and the divided masks are individually fixed to the mask erection means fixed to the rear plate. It is extremely difficult to accurately set all the division masks corresponding to the areas to be divided and scanned by and to accurately set the interval with the phosphor screen. There is a problem that breaks are likely to occur.

The present invention has been made in view of the above-mentioned problems, and it is possible to accurately set a plurality of division masks corresponding to an area to be divided and scanned by an electron beam, and a phosphor screen and each. It is an object of the present invention to be able to accurately set the distance from the division mask to a predetermined value.

[0014]

Fluorescent light which is divided into a plurality of regions in horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and is scanned on an inner surface of a substantially rectangular face plate. A plurality of division masks in which a body screen is formed and a plurality of effective portions in which a large number of electron beam passage holes are formed are vertically connected through ineffective portions are arranged in parallel in the horizontal direction. In a method of manufacturing a color picture tube in which a mask faces a phosphor screen by being supported by a substantially rectangular rear plate facing the face plate or a mask erection means fixed to the face plate, the split mask is slit horizontally. A plurality of these divided masks are arranged in parallel with each other via a half-etching portion, and the divided masks are connected to each other by connecting portions provided at both end portions in the vertical direction through the half etching portion. And a step of forming a shadow mask, which has a positioning hole formed in the connecting portion at both ends thereof, by a photo-etching method, and positioning for engaging the mask erection means and the positioning hole of the shadow mask on the rear plate or face plate. The step of mounting the pins, the step of engaging the positioning holes of the shadow mask with the positioning pins attached to the rear plate or the face plate to position the shadow mask, and the divided masks of the positioned shadow mask are separated from the rear plate or face. The divided masks are supported by the mask erection means by the step of welding to the mask erection means attached to the plate and the step of separating and removing the connecting portion from each divided mask welded to the mask erection means at the half etching section. I chose

[0015]

When the division mask is attached to the mask erection means attached to the rear plate or the face plate as described above, a plurality of division masks are brought into a predetermined relationship in correspondence with the area to be divided and scanned by the electron beam. It is possible to keep the distance, and it is possible to accurately set the interval between the phosphor screen and each divided mask.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described based on embodiments with reference to the drawings.

FIG. 1 shows the overall construction of a color picture tube according to the embodiment, and FIG. 2 is an exploded perspective view thereof. This color picture tube is made of a substantially rectangular flat glass face plate 1 and a glass which is joined to the peripheral edge of the face plate 1 by frit glass and extends substantially perpendicularly to the face plate 1. Side wall 2 made of glass, a substantially rectangular flat glass rear plate 3 facing the face plate 1 through the side wall 2 and joined in parallel with frit glass, and joined to the rear plate 3 with frit glass It has a vacuum envelope 5 made up of a plurality of funnels 4 that are formed. The multiple funnels 4
Are joined around a plurality of openings 6 formed in the rear plate 3, respectively, and in the illustrated example, 5 in the horizontal direction (X direction) and 4 in the vertical direction (Y direction), 20 in total. The funnel 4 is joined.

On the inner surface of the face plate 1, blue,
An integrated structure in which vertically-elongated striped three-color phosphor layers emitting green and red are regularly arranged in parallel in the horizontal direction, and a black stripe layer is provided so as to fill the three-color phosphor layers. The phosphor screen 8 is formed. A shadow mask 9 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. The shadow mask 9 is composed of a plurality of divided masks, in the illustrated example, five divided masks M1 to M5 which are arranged in parallel in the horizontal direction at a predetermined distance W from each other. Each division mask M
1 to M5, a plurality of effective portions 10 in which a large number of electron beam passage holes are formed are connected in the vertical direction through four ineffective portions in which no electron beam passage holes are formed.
Each of the divided masks M1 to M5 is attached to a mask erection means 11a having a U-shaped cross section, which is fixed to the inner surfaces of both ends in the vertical direction of the rear plate 3 by frit glass, and the mask erection means 11a and the rear plate 3 are attached.
It is supported in a state where tension is applied by the mask erection means 11b having a U-shaped cross section, which is fixed to the intermediate portion of the inner surface of the rear plate 3 so as to sandwich each of the openings 6 from the vertical direction.

On the other hand, each neck 1 of the plurality of funnels 4
Electron guns 13 are provided in each of the two. Further, a plurality of plate supporting means 14 are provided between the face plate 1 and the rear plate 3. The plate supporting means 14 is for supporting the atmospheric pressure load applied to the face plate 1 and the rear plate 3 of the vacuum envelope 5, and the tip end portion which comes into contact with the phosphor screen 8 is formed in a wedge shape and is a metal columnar body. The base end portion is fixed to the rear plate 3 by the frit glass so that the front end portion is located on each intersection of a plurality of regions of the phosphor screen 8 which is divided and scanned by the electron beam described later. ing. Reference numeral 15 is a positioning pin for positioning the shadow mask when assembling a color picture tube which will be described later.

In this color picture tube, the electron beam emitted from each electron gun 13 is deflected horizontally and vertically by a magnetic field generated by a deflection device (not shown) mounted outside each funnel 4. Each divided mask M1
Through the effective portion 10 of M5 to M5, the phosphor screens 8 are divided into a plurality of regions, five in the horizontal direction and four in the vertical direction in the illustrated example.
A total of 20 areas R1 to R20 are divided and scanned. The images drawn on the phosphor screen 8 by this division scanning are connected by the signal applied to the electron gun 13 and the deflecting device, and one large image having no overlap or discontinuity is reproduced on the entire surface of the phosphor screen 8. Has become.

Next, a method for manufacturing the color picture tube will be described.

First, as for the shadow mask 9, the shadow mask 9a shown in FIG. 3 is prepared by the photoetching method similarly to the conventional shadow mask. That is, a plurality of divided masks in which a plurality of effective portions 10 are vertically connected through ineffective portions are arranged in parallel through a slit portion 16 in the horizontal direction, and these divided masks M1 to M5 pass through a half etching portion 17. Are connected integrally by connecting portions 18 provided at both ends in the vertical direction, and the connecting portion 1
A shadow mask 9a having a positioning hole 19 is formed at a predetermined position of 8. Both ends of the slit portion 16 cross the half etching portion 17 and extend to the connecting portion 18. The width of the slit portion 16 matches the horizontal distance w between the divided masks incorporated in the color picture tube. The half-etched portion 17 is formed by etching only one side of the electron beam passage hole of the effective portion 10 formed by etching from both sides of the mask material, the slit portion 16 and the positioning hole 19. . Further, in this color picture tube, since the shadow mask 9 is used in a flat state, curved surface molding by press molding is not performed unlike the conventional shadow mask.

In assembling the color picture tube, first, the phosphor screen 8 having an integrated structure is formed on the inner surface of the face plate 1 by the photo printing method using the shadow mask 9a or the photo mask or the master mask. Further, as shown in FIG. 4, at a predetermined position on the inner surface of the rear plate 3, mask erection means 11a, 1 for supporting each divided mask.
1b and a plurality of plate supporting means 14 for supporting the atmospheric pressure load applied to the face plate and rear plate of the vacuum envelope, and the shadow mask 9a by engaging with the positioning holes 19 of the shadow mask 9a shown in FIG. The positioning pin 15 for positioning is fixed by applying and baking frit glass. Further, the electron gun 13 is sealed in the necks 12 of the plurality of funnels 4.

Then, the shadow mask 9 is attached to the mask erection means 11a and 11b fixed to the rear plate 3. That is, as shown in FIG. 5, the positioning pins 15 fixed to the rear plate 3 are engaged with the positioning holes 19 of the shadow mask 9a for positioning, and then the divided masks M1 to M5 of the positioned shadow mask 9a are positioned.
Is welded to the mask erection means 11a under tension. The divided masks M1 to M5 are welded by bending and welding the mask erection means 11a in the directions opposite to each other, and then releasing the bending to make the divided masks M1.
Tension can be applied to ~ M5. As a result of this welding, the divided masks M1 to M5 become mask erection means 11a, 11
Flatly supported by b. After that, the connecting portion 18 is separated and removed from the divided masks M1 to M5 supported by the mask erection means 11a and 11b by cutting with the half etching portion 17 provided on the shadow mask 9a.

Next, the face plate 1 having the phosphor screen 8 formed thereon, a plurality of side wall pieces constituting the side wall 2, the plate supporting means, the rear plate 3 to which the divided masks M1 to M5 are fixed, and the electron gun 13 are provided. The plurality of sealed funnels 4 are positioned in a predetermined relationship, and these are joined together by firing the coated frit glass. Then, it is manufactured by exhausting the envelope 5 assembled as one body.

As a method of manufacturing this color cathode ray tube device, in addition to the above, the funnel 4 may be joined to the rear plate 3 and then the electron gun 11 may be sealed in the neck 10 of the rear plate 3, or the side wall 2 may be formed beforehand. It may be bonded to the face plate 1 or the rear plate 3 and can be manufactured by a method other than the above.

By the way, as described above, a plurality of divided masks in which the effective portions 10 are connected in advance in the vertical direction via the ineffective portions 11 are arranged in parallel in the horizontal direction via the slit portions 16, and these divided masks M1 .About.M5 are integrally connected through the half-etched portion 17 by connecting portions 18 provided at both ends in the vertical direction, and a shadow mask 9 in which a positioning hole 19 is formed at a predetermined position of the connecting portion 18.
a is formed on the other hand, on the other hand, the positioning pins 15 are attached to the rear plate 3 together with the mask erection means 11a and 11b, and the positioning holes 19 of the shadow mask 9a are engaged with the positioning pins 15 for positioning. The divided masks M1 to M of the positioned shadow mask 9a
When 5 is welded to the mask erection means 11a under tension, the plurality of divided masks M1 to M5 are kept in a predetermined relationship, and the accuracy can be improved corresponding to a plurality of regions divided and scanned by the electron beam. It can be well supported by the mask erection means 11a and 11b, and the distance between the phosphor screen 8 and each of the divided masks M1 to M5 can be set with high precision. As a result, overlapping and breaks of images drawn in a plurality of areas are prevented by division scanning of electron beams emitted from a plurality of electron guns 13, and a continuous good-quality image is reproduced on the phosphor screen 8. be able to.

In the above embodiment, the mask erection means is directly joined and fixed to the rear plate. However, in this mask erection means, the rear plate is joined with the fixing member and the fixing member is also welded. Good.

In the above embodiment, the case where the shadow mask is attached to the rear plate via the mask erection means has been described. However, the present invention fixes the positioning pins to the face plate together with the mask erection means,
It can also be applied to the case where the divided mask is supported by the mask erection means.

[0030]

EFFECTS OF THE INVENTION A phosphor screen is formed on the inner surface of a substantially rectangular face plate, which is divided into a plurality of regions in horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and is scanned. A plurality of divided masks in which a plurality of effective portions having electron beam passage holes are vertically connected to each other through non-effective portions are arranged in parallel in the horizontal direction. In a method of manufacturing a color picture tube which is supported by a mask erection means fixed to a substantially rectangular rear plate or a face plate facing the fluorescent screen and faces the phosphor screen, the split mask is horizontally aligned through a slit portion. A plurality of these divided masks are arranged in parallel, and these divided masks are integrally connected by connecting portions provided at both ends in the vertical direction through the half-etched portion, A step of forming a shadow mask in which positioning holes are formed in the connecting portions at both ends by a photo-etching method, and a step of attaching mask positioning means and positioning pins that engage with the positioning holes of the shadow mask to the rear plate or face plate. And a step of engaging the positioning holes of the shadow mask with the positioning pins attached to the rear plate or the face plate to position the shadow mask, and the divided masks of the positioned shadow mask are attached to the rear plate or the face plate. When the divided masks are supported by the mask erection means by the step of welding to the mask erection means and the step of separating and removing the connecting portion from each divided mask welded to the mask erection means at the half etching section, the mask erection means is erected. A plurality of divided masses supported by means Can be accurately set in correspondence with a plurality of areas which are divided and scanned by the electron beam, and the interval between the phosphor screen and each divided mass can be set with high accuracy. . As a result, it is possible to prevent overlapping and breaks in the images drawn in the respective areas by the divided scanning of electron beams emitted from a plurality of electron guns, and to reproduce a continuous image of good quality on the phosphor screen. The tube can be easily manufactured.

[Brief description of drawings]

FIG. 1 (a) is a perspective view showing the configuration of a color picture tube according to an embodiment of the present invention, and FIG. 1 (b) is a BB sectional view thereof.

FIG. 2 is an exploded perspective view showing a configuration of the color picture tube.

FIG. 3 is a diagram showing a configuration of a shadow mask used for manufacturing the color picture tube.

FIG. 4 is a view for explaining how to mount the mask erection means, the plate support means, and the positioning pins on the rear plate in the manufacture of the color picture tube.

FIG. 5 is a diagram for explaining attachment of a shadow mask to the rear plate.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 2 ... Side wall 3 ... Rear plate 4 ... Funnel 5 ... Vacuum envelope 8 ... Phosphor screen 9 ... Shadow mask 10 ... Effective part 11a, 11b ... Mask installation means 13 ... Electron gun 14 ... Plate support means 15 ... Positioning pin 16 ... Slit part 17 ... Half etching part 18 ... Connecting part 19 ... Positioning holes M1 to M5 ... Dividing masks R1 to R20 ... Region

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yuji Haraguchi 1-9-2 Harara-cho, Fukaya-shi, Saitama Inside Fukaya Electronics Factory, Toshiba Corporation (72) Eiji Kamaba 1-chome, Harara-cho, Fukaya, Saitama No. 2 inside Toshiba Fukaya Electronics Factory

Claims (1)

[Claims] 1. A phosphor screen is formed on an inner surface of a substantially rectangular face plate, which is divided into a plurality of regions in horizontal and vertical directions by an electron beam emitted from a plurality of electron guns and is scanned. A plurality of divided masks in which a plurality of effective portions having electron beam passage holes are vertically connected to each other through non-effective portions are arranged in parallel in the horizontal direction. In a method of manufacturing a color picture tube, which is supported by a mask erection means fixed to a substantially rectangular rear plate facing the plate or the face plate and faces the phosphor screen, the split mask is horizontally slit. A plurality of divided masks are arranged in parallel with each other, and the divided masks are connected by the connecting portions provided at both end portions in the vertical direction through the half etching portion. A step of forming a shadow mask connected to the body and having positioning holes formed in the connecting parts at both ends thereof by a photo-etching method; and the mask installation means and the positioning holes for the shadow mask on the rear plate or the face plate. Mounting a positioning pin that engages with, positioning the shadow mask by engaging a positioning hole of the shadow mask with a positioning pin attached to the rear plate or face plate,
Welding each divided mask of the positioned shadow mask to the mask erection means attached to the rear plate or the face plate, and for each divided mask welded to the mask erection means in the half etching section. A method of manufacturing a color picture tube, characterized in that the divided mask is supported by the mask erection means by the step of separating and removing the connecting portion.