JPH08264136A - Color television picture tube and its manufacture thereof - Google Patents

Abstract

PURPOSE: To lay a flat shadow mask at high precision, make a mask laying means simple and light, and provide a color television picture tube with high resistance to deformation and vibration. CONSTITUTION: A color television picture tube scans a phosphor screen 8 formed on the opposite to a shadow mask 10 in the inner face of a face plate 1 with electron beams emitted from a plurality of electron guns 16 while the screen being divided into a plurality of regions R1-R20. The shadow mask 10 is composed by arranging a plurality of mask pieces in parallel in a first axial direction, both end parts of each mask piece are fixed in a second axial direction in a plurality of mask frames 11, and a pair of stages 13 whose one end parts are fixed in the inner face of a face plate and the other end parts pass the insides of mask frames and are brought into contact with both end parts of the mask pieces in the second axial direction are installed.

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 for manufacturing the same, and more particularly, to a color picture tube for displaying an image of good quality by accurately adjusting the relative positional relationship between a phosphor screen and a shadow mask. And a manufacturing method thereof.

[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.

Therefore, conventionally, a method of arranging a plurality of independent small picture tubes to obtain a high resolution large screen is disclosed in JP-A-48-90428, JP-A-49-21019, and JP-A-53-53. -117130 gazette etc. are disclosed. This type of method is effective for displaying a huge image with a large number of divisions arranged outdoors, but the screen size is 4
When displaying a medium-sized large image of about 0 inch, the seams of the images between the areas are conspicuous and an unpleasant image is reproduced.
Therefore, when it is used as a home television receiver or as a terminal for graphic display in computer-aided design (CAD), the seam of the screen becomes a fatal defect.

In contrast, US Pat. No. 3,071,7
No. 06 specification, Japanese Utility Model Publication No. 39-25641, Japanese Patent Publication No. 42-4928, Japanese Patent Publication No. 50-17167, etc., have a structure in which a plurality of independent picture tube phosphor cleans are integrated. Is disclosed. A picture tube having a phosphor screen of this integrated structure is a vacuum envelope formed by a face plate on which a phosphor screen is formed, a rear plate arranged facing the face plate, and a plurality of funnels adjacent to the rear plate. Vessels are configured.

However, in such a structure, when the screen surface becomes large, the face plate and the rear plate must be thickened so as to withstand the atmospheric pressure load. It is also necessary to have a large curvature in the tube axis direction. As a result, the weight of the envelope becomes heavy. Further, when the curvature of the face plate becomes large, the screen becomes difficult to see. Furthermore, the distance between the phosphor screen and the electron gun enclosed in the neck becomes large, and the electron lens becomes unfavorable in terms of magnification.

As a picture tube which solves the problems of the picture tube having the phosphor screen of the above-mentioned integrated structure, Japanese Patent Application Laid-Open No. 5-3.
Japanese Patent No. 6363 discloses that a face plate is flattened, and a phosphor screen having an integrated structure formed on the inner surface of the face plate is divided into a plurality of regions and scanned by electron beams emitted from a plurality of electron guns. A picture tube is shown. In this picture tube, a support is arranged inside the envelope to support an atmospheric pressure load applied to the flat face plate.

However, if such a structure is applied to a color picture tube having a shadow mask, the shadow mask arranged so as to face the phosphor screen also has to be flat, which causes the following problems. .

First, the method of locking the shadow mask poses a problem. In the case where the face plate has a spherical shape like the conventional color picture tube, the shadow mask is also formed in a spherical shape. Therefore, by attaching a high-strength frame to its peripheral portion, it is possible to easily impart practical mechanical strength to the shadow mask. Therefore, it is easy to dispose it in a predetermined relationship so as to face the phosphor screen formed on the inner surface of the face plate. However, if the face plate is flat, the shadow mask must also be flat. Therefore, the mechanical strength becomes insufficient, and it is not easy to dispose the frame in a predetermined relationship with the phosphor screen even if a frame is attached to the peripheral portion to reinforce like a conventional shadow mask.

Generally, for a cylindrical shadow mask which is flat or has a curvature only in one direction, it is attached to a frame having a high strength in a state where tension is applied to the shadow mask.
Sufficient mechanical strength can be imparted and the phosphor screen can be arranged in a predetermined relationship through the frame. As such a color picture tube, one in which a large funnel is connected to a face plate is disclosed in Japanese Unexamined Patent Publication No. Hei 2 (1999) -211.
No. 158544.

However, in such a structure, the tension required for the shadow mask must be increased with the increase in the size of the screen, so that a frame having a higher strength is required and the weight of the color picture tube is increased. Moreover, the locking means for locking the shadow mask to the face plate via the frame becomes complicated. Further, there is a problem that a sufficient space for providing the locking means is required.

Second, the accuracy of the shadow mask installation poses a problem. Normally, a phosphor screen of a color picture tube is exposed by a photo printing method using a shadow mask incorporated in the color picture tube as an exposure mask to expose a screen forming member layer such as a phosphor slurry applied and formed on the inner surface of the face plate. It is formed by Therefore, when the distance (q value) between the shadow mask and the inner surface of the face plate deviates from a predetermined value, the arrangement distance of the phosphor layers forming the phosphor screen is affected. However, the continuity on the entire surface of the phosphor screen is not affected. However, in a color picture tube in which the phosphor screen having an integrated structure is divided into a plurality of areas for scanning, the shadow mask is effective in that a large number of electron beam passage holes are formed corresponding to the plurality of areas. Since a plurality of parts are connected through the ineffective part in which the electron beam passage hole is not formed, the phosphor screen is affected by the q value between adjacent regions. When the q value is larger than the predetermined value, the phosphor layers overlap each other between the adjacent regions, and when the q value is smaller than the predetermined value, a gap is formed between the phosphor regions between the adjacent regions.

Also, when the phosphor screen is formed by a master mask method using a photomask or the like, the q value must be set accurately. According to the master mask method, a continuous phosphor screen can be accurately formed, but if the q value is deviated, the electron beam does not land correctly on the phosphor layer when the color picture tube is assembled. So-called mislanding occurs. In addition, images may overlap or a gap may occur between adjacent areas.

Further, apart from the formation of the phosphor screen,
The required accuracy of the q value depends on the horizontal deflection angle and the arrangement pitch of the electron beam passage holes of the shadow mask, but is about 0.01.
It is about mm. This indicates that extremely high precision setting is necessary as compared with the required precision of the q value required in the conventional color picture tube of about 0.5 mm. Therefore, in a color picture tube in which a phosphor screen having an integrated structure formed on the inner surface of a flat face plate is divided into a plurality of areas and scanned, it is substantially impossible to install a shadow mask by known means. Nearly impossible.

Thirdly, the deformation and vibration of the shadow mask pose a problem. A flat shadow mask is vulnerable to deformation and vibration. When the shadow mask is deformed, the q value shifts, resulting in mislanding. Further, when the shadow mask vibrates, the q value shifts during the period of the vibration, so that mislanding similarly occurs.

Fourth, the deformation that occurs when the shadow mask is attached to the mask frame poses a problem. As described above, since the flat shadow mask imparts mechanical strength, it is fixed to the mask frame by welding in a tensioned state, and the vicinity of the welded portion is easily deformed during the welding. This deformation temporarily melts the vicinity of the welded place under tension, so the stress (tension) is partially relaxed, and after cooling, a stress difference occurs between the welded part and its periphery, It occurs because it remains as a deformation. Therefore, this deformation can be considerably alleviated by optimizing the welding conditions and welding locations. However, it is difficult to completely eliminate the effect, especially in a color picture tube that requires a highly accurate flatness and q value for a shadow mask.
It becomes a fatal defect.

Fifth, there is a problem in setting the relative positional relationship between the shadow mask and the phosphor screen. As described in the second problem above, the space (q value) between the shadow mask and the phosphor screen needs to be set very accurately. Alignment is also important, and the positions of the horizontal axis, the vertical axis, and the rotation direction must be set with high accuracy together with the distance between the shadow mask and the phosphor screen. This setting accuracy depends on the arrangement pitch of the electron beam passage holes of the shadow mask and the phosphor layer of the phosphor screen, but needs to be about 0.01 mm. Furthermore, in setting the relative position of the shadow mask and the phosphor screen, it is desirable to observe them simultaneously and directly for alignment, but in practice, for example, the phosphor screen is observed through the shadow mask. It is difficult to do so, and since the aluminum vapor deposition film is formed on the back surface of the phosphor screen, the position of the phosphor layer cannot be accurately grasped, and the shadow mask and the phosphor screen are simultaneously and simultaneously It is difficult to observe directly.

Therefore, in the conventional relative alignment between the shadow mask and the phosphor screen, the phosphor layer is observed from the outside of the face plate, the position is set on the assembly jig, and the face plate is fixed. Similarly, the electron beam passage hole of the shadow mask is observed, and its position is set on the assembly jig to fix the shadow mask. However, such a method accumulates positioning errors, resulting in high accuracy. Cannot be aligned.

[0019]

As described above, the color picture tube which divides and scans the phosphor screen of the integral structure formed on the inner surface of the flat face plate into a plurality of areas is described as follows. Since the shadow mask placed opposite the screen must also be flat,
Problems with shadow mask locking method, shadow mask installation accuracy, shadow mask deformation and vibration, deformation that occurs when the shadow mask is attached to the mask frame, and setting of the relative positional relationship between the shadow mask and the phosphor screen Becomes In particular, when the color picture tube becomes large, it becomes extremely difficult to install the shadow mask with high accuracy. Further, it becomes difficult to simplify and reduce the weight of the mask erection means. Further, there is a problem that the shadow mask becomes extremely weak against deformation and vibration.

The present invention has been made to solve the above-mentioned problems, and a flat shadow mask can be erected with high accuracy, and the mask erection means for supporting the shadow mask can be simply and lightly weighted to prevent deformation and vibration. The first object is to construct a color picture tube that is strong against light. A second object of the invention is to obtain a manufacturing method capable of easily assembling such a color picture tube.

[0021]

[Means for Solving the Problems]

(1) An envelope having a substantially rectangular face plate having first and second axes orthogonal to each other,
In a color picture tube in which a phosphor screen formed on the inner surface of the face plate facing the shadow mask is divided into a plurality of areas by an electron beam emitted from a plurality of electron guns and scanned, a large number of shadow masks are provided. A plurality of mask pieces having an effective portion having electron beam passage holes are arranged in parallel in the first axial direction, and the second axial end portions of each mask piece have a plurality of mask frames. And a pair of stages, one end of which is fixed to the inner surface of the face plate and the other end of which is in contact with each mask piece or each second axial end of the mask frame.

(2) An envelope having a substantially rectangular face plate having first and second axes orthogonal to each other is provided, and fluorescent light formed on the inner surface of the face plate so as to face the shadow mask. In a color picture tube in which a body screen is divided into a plurality of regions and scanned by electron beams emitted from a plurality of electron guns, a shadow mask is provided with a plurality of effective portions in which a large number of electron beam passage holes are formed. The mask pieces are arranged in parallel in the first axial direction, the second axial end portions of each mask piece are fixed to a plurality of mask frames, and the second mask outside the effective portion of each mask piece is fixed. Positioning holes were provided at both ends in the axial direction, and a plurality of positioning marks corresponding to the positioning holes of each mask piece were provided at both ends in the second axial direction of the phosphor screen.

(3) A plurality of mask pieces having an effective portion in which a large number of electron beam passage holes are formed and having positioning holes formed at both ends in the second axial direction outside the effective portion are the first. A plurality of shadow masks arranged in parallel in the axial direction, a phosphor screen formed on the inner surface of the face plate so as to face the shadow mask, and the mask pieces of the above-mentioned mask pieces at both ends in the second axial direction of the phosphor screen. And a screen portion having a plurality of positioning marks formed corresponding to the positioning apertures, and a plurality of phosphor screens through the effective portion of each mask piece by an electron beam emitted from a plurality of electron guns. In the method of manufacturing a color picture tube which is divided into regions and scanned, the effective portion and the positioning aperture of each mask piece are formed in the same step, and the phosphor screen of the screen portion and the positioning mark are formed. Preparative was formed in the same step, so as to align the phosphor screen and the mask piece by positioning the positioning mark and these positioning apertures coaxially.

As described in (1) above, the shadow mask is formed by horizontally arranging a plurality of mask pieces each having an effective portion in which a large number of electron beam passage holes are formed. By fixing both axial ends of the second mask to a plurality of mask frames, the length of the shadow mask in the first axial direction can be shortened according to the number of mask pieces, and the tension applied to the shadow mask can be reduced. Therefore, by doing so, the structure of the mask frame can be made simple and lightweight.

Further, by providing a pair of stages, one end of which is fixed to the inner surface of the face plate and the other end of which passes through the inside of the mask frame and is in contact with the second axial ends of each mask piece, a shadow mask is formed. The distance (q value) from the phosphor screen formed on the inner surface of the face plate can be set by the height of the stage. Since the height of the stage can be set with high precision by machining, the gap (q value) between the shadow mask and the inner surface of the face plate caused by the precision of the mask frame and the precision of mounting each mask piece on the mask frame. It is possible to avoid the influence of (1) on the effective portion due to the deformation caused when the mask piece is welded to the mask frame. When each mask piece is brought into contact with the stage, the tension applied to the mask piece can be adjusted by adjusting the pressing amount of the mask piece against the stage. Also, by weakening the tension when attaching the mask piece to the mask frame in advance and weakening the tension when welding the mask piece to the mask frame, the deformation during mask piece welding is reduced and the mask piece is applied to the stage. It is also possible to apply a desired tension at the time of contact.

Further, as in (2), the shadow mask is constructed by arranging a plurality of mask pieces having an effective portion in which a large number of electron beam passage holes are formed in parallel in the first axial direction. By fixing both ends of the second axial direction of the piece to the plurality of mask frames, the length of the shadow mask in the first axial direction can be shortened according to the number of mask pieces, as in the case of (1). The tension applied to the shadow mask can be reduced.
Therefore, by doing so, the structure of the mask frame can be made simple and lightweight.

Further, positioning openings are provided at both ends in the second axial direction outside the effective portion of each mask piece, and a plurality of positioning openings are provided at both ends in the second axial direction of the phosphor screen. By providing the positioning marks individually, the positioning mark and the part of the positioning aperture or the electron beam passage hole are aligned with each other to directly and accurately align the mask piece and the phosphor screen, which are separated from each other by a predetermined distance. can do.

Further, as in (3), the effective portion of each mask piece and the positioning opening are formed in the same step, the phosphor screen of the screen portion and the positioning mark are formed in the same step, and these positioning openings are formed. When the phosphor screen and each mask piece are aligned by coaxially locating the positioning mark and the positioning mark, the positioning aperture and the positioning mark are always placed in a fixed relationship with respect to the effective portion of the mask piece and the phosphor screen. It can be formed with high accuracy, and the phosphor screen and the mask piece can be aligned with high accuracy by coaxially positioning the positioning aperture and the positioning mark.

[0029]

BEST MODE FOR CARRYING OUT THE INVENTION 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 an embodiment of the present invention, and FIG. 2 is an exploded perspective view thereof. This color picture tube connects the divided images obtained in each area by dividing the phosphor screen of the integrated structure into a plurality of areas by an electron beam emitted from a plurality of electron guns and scanning the divided areas. A color picture tube that displays a composite image on a phosphor screen, and has first and second axes orthogonal to each other, for example, horizontal and vertical axes (X axis, Y axis).
Face plate 1 made of substantially rectangular (horizontally long) flat glass having an axis, and this face plate 1
A side wall 2 made of glass that is joined to the peripheral portion of the face plate 1 and extends substantially perpendicularly to the face plate 1, and a substantially rectangular shape that is joined to the side wall 2 and faces the face plate 1 in parallel. The vacuum envelope 5 includes a rear plate 3 made of flat glass and a funnel 4 made of a plurality of glasses joined to the rear plate 3. The plurality of funnels 4 are respectively joined around the plurality of openings 6 formed in the rear plate 3,
In the illustrated example, the rear plate 3 has a horizontal direction of 5 (X direction).
A total of 20 openings 6 are formed, four in the vertical direction (Y direction), and 20 funnels 4 are joined to the openings 6.

On the inner surface of the face plate 1, blue,
The three-color phosphor layers in the form of stripes elongated in the vertical direction (Y-axis direction) that emits green and red are regularly arranged in the horizontal direction, and the black stripes are elongated in the vertical direction so as to fill the phosphor layers between the three colors. An integrated phosphor screen 8 having layers is provided. The face plate 1 made of glass and a plate-like fixing member 9 made of a nickel alloy having a similar thermal expansion coefficient are fixed at both ends in the vertical direction with the phosphor screen 8 interposed therebetween, for example, with frit glass. A shadow mask 10 is arranged inside the phosphor screen 8 so as to face the phosphor screen 8. The shadow mask 10 is composed of a plurality of rectangular flat mask pieces having a longitudinal direction in the vertical direction, and in the illustrated example, five mask pieces M1 to M5. Each mask piece M1 ~
M5 are held by rectangular mask frames 11 each having a vertical direction in the vertical direction, and are arranged in parallel in the horizontal direction at a predetermined interval, and fixing pieces 12 attached to the respective mask frames 11 are attached to the inner surface of the face plate 1. It is held by being fixed to the fixing member 9 fixed to. Further, between the mask pieces M1 to M5 of the shadow mask 10 and the inner surface of the face plate 1, a stage 13 for setting the mask pieces M1 to M5 to the inner surface of the face plate 1 at a predetermined interval (q value). Are arranged. One end of the stage 13 is fixed to the fixing member 9 via a fixing piece 14, and the other end of the stage 13 passes through the insides of the both ends of each mask frame 11 in the vertical direction and is in contact with the mask pieces M1 to M5. The shadow mask 10, the mask frame 11, and the stage 13 will be described later.

On the other hand, each neck 1 of the plurality of funnels 4
Electron guns 16 are arranged in each of the parts 5. Further, between the face plate 1 and the rear plate 3, a plurality of supporting means 17 for supporting the atmospheric pressure load applied to the face plate 1 and the rear plate 3 are arranged.
This supporting means is formed of a metal columnar body having a wedge-shaped tip end portion that abuts the phosphor screen 8 and a base end portion fixed to the rear plate 3 by frit glass, for example.

In this color picture tube, the electron beams emitted from the electron guns 16 arranged in the necks 15 are mounted on the outer sides of the respective funnels 4 to form a plurality of deflecting devices ( The fluorescent screen 8 is deflected in the horizontal and vertical directions by a magnetic field generated by (not shown), and the phosphor screen 8 is divided into a plurality of regions in the horizontal and vertical directions via the shadow mask 10, in the illustrated example, 5 in the horizontal direction (X-axis direction). The area is divided into 20 areas R1 to R20, four in the vertical direction, for scanning. Then, the divided images drawn on the phosphor screen 8 by this division scanning are connected by signals applied to the electron gun 16 and the deflecting device, and a large composite image having no overlap or gap on the phosphor screen 8 is reproduced. ing.

Mask pieces M1 to M1 of the shadow mask 10
M5 is divided into a number corresponding to the number of horizontal divisions of the plurality of regions R1 to R20, and a large number of electron beam passage holes are formed in the longitudinal direction of each mask piece M1 to M5. In the illustrated example, four effective portions 19 are formed corresponding to the number of divisions of the vertical region through the ineffective portion 20 in which the electron beam passage hole is not formed. The mask pieces M1 to M5 are provided with ineffective portions 20 at both end portions in the vertical direction and both side edges in the horizontal direction, and the effective portions 19 are provided.
Are formed in a structure surrounded by ineffective portions 20, respectively.

As shown in FIG. 3A, the mask frame 11 holding the mask pieces M1 to M5 has a pair of side portions 22 having an L-shaped cross section and both end portions of the pair of side portions 22. Is formed in a rectangular frame composed of a pair of mask piece attachment portions 23 having an L-shaped cross section, and a reinforcing portion 24 hung on an intermediate portion of the pair of side edge portions 22. The fixing pieces 12 are attached to the side surfaces of the portion 23, respectively.

The mask pieces M1 to M5 are provided on the upper surface of the mask piece mounting portions 23 at both ends of the mask frame 11, respectively.
For example, laser welding is performed by spot welding at a pitch of 1 mm in a state in which tension is applied, and the mask piece mounting portion 23 is mounted in a state of being floated from the pair of side portions 22. In this structure, each mask piece M1 is attached to the mask frame 11.
It is effective in preventing the mask pieces M1 to M5 from being deformed due to contact with the side edge portion 22 when mounting the mask pieces M1 to M5.

As shown in FIG. 4 (a), the stage 13 is made of a flat plate member such as nickel alloy or stainless steel having a width w substantially equal to the inner distance between the pair of side portions of the mask frame, and its height. h is processed with high precision in order to set the mask pieces at a predetermined interval (q value) with respect to the inner surface of the face plate. Then, as shown in FIG. 5A, the fixing piece 14 attached to the flat plate-like member is fixed to the fixing member 9 fixed to the inner surface of the face plate 1, and attached to the face plate 1 and the mask frame 11. Mask piece M (M1 to M5
) And the mask piece M (M1 ~
M5) is slightly pushed out to the rear plate 2 side, and the mask piece M
Is increased to give a required tension, and the mask pieces M are set at a predetermined interval with respect to the inner surface of the face plate 1.

Specifically, the mask pieces M1 to M5 of such a color picture tube have a vertically long low carbon film having a plate thickness of 0.15 mm, a vertical length of about 340 mm, and a horizontal width of about 80 mm. The low carbon steel plate is made of a steel plate, and four effective portions 19 each having a vertical length of about 60 mm and a horizontal width of about 64 mm are vertically formed through ineffective portions 20.
9 has slit-shaped electron beam passage holes each having a width of about 0.2 mm. The stage 13 is made of nickel alloy or stainless steel having a plate thickness of 0.8 mm and a height of about 8 mm, which is almost equal to the distance 8 mm between the inner surface of the face plate 1 and the mask piece M.

Such a color picture tube can be assembled as follows. The fixing members 9 are attached by frit glass to both ends of the face plate 1 in the vertical direction. Then, the phosphor screen 8 is formed on the inner surface of the face plate 1 to which the fixing member 9 is attached by the master mask method in photo printing. The phosphor screen 8 is formed by first forming a black stripe using a photosensitizer, black paint, etc., and then using a photosensitive phosphor slurry to form the above-mentioned black, as in a normal black stripe type color picture tube. A stripe-shaped three-color phosphor layer is formed in the gap between the stripes. After that, an aluminum film is formed on the back surfaces of the black stripe and the three-color phosphor layer by vapor deposition. On the other hand, apart from the formation of the phosphor screen 8, mask pieces M1 to M5 are formed by a photo-etching method similarly to a shadow mask of a normal color picture tube, and the mask pieces M1 to M5 are assembled using an assembling jig. , A mask piece attachment portion 23 at both ends of the mask frame 11 is applied with a tension weaker than the tension finally applied.
Laser spot welding to 1mm pitch spot welding. The electron gun 16 is sealed in each neck 15 of the plurality of funnels 4.

Then, using the assembly jig, the stage 1 is attached to the fixing member 9 attached to the inner surface of the face plate 1.
Position and mount 3. Further, the mask pieces M1 to M5 attached to the mask frame 11 are arranged at positions contacting the stage 13 and aligned with the phosphor screen 8 formed on the inner surface of the face plate 1 in a predetermined relationship. Aligned mask pieces M1 to M5
Is pushed to a position where the fixing piece 12 attached to the mask frame 11 contacts the fixing member 9, and the fixing piece 12 is welded to the fixing member 9.

Then, using an assembly jig, the face plate 1 to which the mask pieces M1 to M5 are attached, the side wall 2, the rear plate 3, and the plurality of funnels 4 in which the electron gun 16 is sealed are predetermined. Combined in a relationship, they are joined together by frit glass. Then, it is manufactured by subjecting it to exhaustion and other treatments in the same manner as in a normal color picture tube.

As a method of manufacturing this color picture tube, in addition to the above, a plurality of funnels 4 with electron guns 16 sealed in advance are joined to a rear plate 3 and mask pieces M1 to M5 are attached. The face plate 1, the side wall 2, and the rear plate 3 to which the plurality of funnels 4 are joined can be integrally joined to each other to manufacture the same.

If the color picture tube is constructed as described above, the following effects can be obtained. (A) By disposing the stage 13 made of a plate-shaped member between the face plate 1 and each of the mask pieces M1 to M5, the distance between the face plate 1 and the shadow mask 10 can be set with high accuracy.

For example, when the stripe-shaped three-color phosphor layer formed on the inner surface of the face plate 1 has a horizontal arrangement pitch of 0.6 mm and a black stripe width of 0.1 mm, the three-color phosphor layer is formed. In order to be continuously arranged, the overlap or gap at the boundary between the regions R1 to R20, which are divided and scanned by the electron beams emitted from the plurality of electron guns 16, is set to 1 of the width of the black stripe. It is necessary to set it to / 5 or less. If the horizontal size of each of the regions R1 to R20 is 80 mm, the distance (q value) between the inner surface of the face plate 1 and the shadow mask 10 is 8 mm.
mm.

Therefore, the overlapping width of each adjacent portion of the plurality of regions R1 to R20 is D, the distance from the deflection center to the phosphor screen 8 is L, and the horizontal size of each region R1 to R20 is H. Then, the deviation amount Δq from the predetermined q value is represented by Δq = D · (L−q) / (H / 2) + D 2. Therefore, the required accuracy of the q value in the color picture tube of this example is about 0.02 mm, and the stage 13 for setting the q value can be manufactured at a low cost by a general processing method.

(B) By disposing the stage 13 between the inner surface of the face plate 1 and the shadow mask 10 and setting the distance between them, the accuracy of the mask frame 11 holding the mask pieces M1 to M5 is reduced. There is no need to raise it. Moreover, since the shadow mask 10 is divided into a plurality of mask pieces, for example, when it is composed of five mask pieces M1 to M5 as shown in the drawing, the respective mask pieces M1 to M5.
The tension applied to M5 is 1 / the tension applied when the shadow mask 10 is composed of one continuous shadow mask.
The mask frame 11 supporting the tension can have a simple structure. That is, even if a steel plate having a plate thickness of about 0.1 mm is bent into an L shape, sufficient strength can be obtained, and it can be made lighter and lower in cost than the mask frame of the conventional color picture tube.

(C) The stage 13 is arranged between the inner surface of the face plate 1 and the shadow mask 10, and one end of the stage 13 is brought into contact with the mask pieces M1 to M5 to apply tension to the mask pieces M1 to M5. It is possible to prevent the effective portion 19 from being deformed by wrinkles or the like caused by welding the to the mask frame 11.

(D) The tension applied to the mask pieces M1 to M5 may be increased by the stage 13 or the mask piece M1 may be attached to the mask frame 11 as shown in the embodiment.
It is possible to adjust the tension applied to each of the mask pieces M1 to M5 by lowering the tension when welding M5 to M5 and finally increasing the tension applied to the mask pieces M1 to M5 by the stage 13.

(E) Since the shadow mask 10 is divided into a plurality of mask pieces, the tension applied to each mask piece is larger than that applied when one shadow mask is formed as described above. Can be made smaller.

(F) Since the shadow mask 10 is composed of a plurality of mask pieces which are horizontally separated from each other, the purity drift caused by thermal expansion of the shadow mask can be prevented. That is, even if each mask piece is heated by the collision of the electron beam, the heat is not transferred to the mask pieces adjacent in the horizontal direction. On the other hand, although it is transmitted in the vertical direction and causes thermal expansion, it does not cause a problem because the phosphor screen is formed by a vertically elongated striped three-color phosphor layer. Purity drift that occurs can be prevented.

The mask frame 11 of this embodiment has a structure in which members having an L-shaped cross section are combined, but the present invention is not limited to this structure. For example, as shown in FIG. This is also applied to the mask frame 11 having a structure in which the materials 51 are combined by welding or the like. In the case of this mask frame 11, strong tension is applied to the shadow mask 10 and the mask frame 11 is not attached to the mask frame 11 but is placed inside. The shadow mask 10 is deformed and a predetermined tension is applied to the shadow mask 10 by the elastic recovery force generated at this time.

When this structure is applied to an ordinary color picture tube, the mask frame 11 can absorb the thermal deformation (thermal expansion) of the shadow mask 10 by the elastic recovery force of the mask frame 11, and the color image display which is required to have high brightness display. The tube has an advantage of being able to reduce a decrease in color purity, but the weight increase and the cost increase of the mask frame 11 are problems. In this embodiment, the screen is horizontally divided into four,
The shadow mask 1 corresponding to each of the divided areas
Since 0 is divided, the mask frame 11 that applies tension to the shadow mask 10 is also divided and separated.
The tension applied to each mask frame 11 is relatively small, and the tension can be sufficiently maintained even with a simple structure. Therefore, in the structure of this embodiment, the increase in weight and the accompanying increase in cost, which are problems in a normal color picture tube, are not large.

The mask frame 11 shown in FIGS. 3A and 3B is, as shown in FIG.
Can be attached to the rear plate 3 side of the shadow mask 10. This mounting position is effective when the distance (q value) between the shadow mask 10 and the screen 8 is narrow.
This is particularly effective when the mask frame 11 shown in FIG. 3B has a three-dimensional structure and a large arrangement space is required.

FIG. 5C shows an embodiment in which the arrangement position of the stage 13 is changed. Stage 13 is shadow mask 10
This is an indispensable structure for maintaining the distance between the screen 8 and the screen 8 with high precision, but the position can be arbitrarily set as long as the above object is achieved. FIG. 5B shows the stage 13 on the mounting surface of the shadow mask 10 of the mask frame 11.
This is an example of arranging. In general, the mask frame 11 having the structure as shown in FIG. 3B is often assembled by welding, and the accuracy (flatness) of the mounting surface of the shadow mask 10 after welding is poor, and it is Processing is performed to improve accuracy. Therefore, in the mask frame 11 thus processed, it is not necessary to maintain and correct the flatness (flat surface) of the shadow mask 10 on the stage 13, and only the interval between the shadow mask 10 and the screen 8 is set with high accuracy. The stage 13 does not necessarily have to be brought into contact with the shadow mask 10,
It suffices to contact the mounting surface of the shadow mask 10 or a reference position having the same accuracy as the mounting surface.

FIGS. 4B and 4C are modified examples of the stage 13. In the example shown in FIG. 4B, the shape of the side in contact with the face plate 1 is two point contacts. This structure 52 reduces the contact area between the stage 13 and the face plate 1 and makes it difficult for the stage 13 to float because residue such as phosphor is trapped between the stage 13 and the face plate 1. As another modification of this structure,
In the case of the mask frame 11 as shown in FIG. 3B, the shadow mask 10 side may be in point contact. Figure 4 (c)
Is an example in which the stage 13 is divided into two and directly attached to the mask frame 11.

FIG. 5D shows an embodiment in which the regulating member 53 is attached to the mask frame 11. In the example of FIG.
Although the shadow mask 10 and the stage 13 can be set to an arbitrary pressing amount, and the tension applied to the shadow mask 10 can be freely adjusted, there is no structure for controlling the pressing amount, and a predetermined amount is pressed by an assembly jig or the like. After that, it is attached to the face plate 1 via the holder. In the embodiment shown in FIG. 5D, a regulating member 53 is provided to regulate the amount of pushing, and the amount of pushing can be set accurately, and in addition to the effect of the stage 13, it is arranged at the center. The holders at the positions can hold the mask frame 11 and the shadow mask 10 in good balance.

In this embodiment, the case where a nickel alloy or stainless steel is used as the material of the stage 13 has been described, but the present invention is also applicable when any material is selected. In the case of the shadow mask 10 made of iron, the stage 13 is used. Is preferably an iron material, and in the case of the shadow mask 10 made of amber material, a nickel alloy having a thermal expansion characteristic similar to that of the shadow mask 10 is preferable, and when magnetic characteristics become a problem, a non-magnetic material may be used.

Also in the color picture tube of the next embodiment, the phosphor screen having an integrated structure is divided into a plurality of regions by the electron beams emitted from the plurality of electron guns and scanning is performed to obtain each region. A color picture tube that connects images and displays a composite image on the phosphor screen,
Since the entire configuration is the same as that of the first embodiment, detailed description thereof will be omitted, and hereinafter, a screen portion, a shadow mask, a mask frame and the like different from the previous embodiment will be described.

The screen section, as shown in FIG.
The vertically elongated striped three-color phosphor layers, which are formed on the inner surface of the face plate 1 and emit blue, green, and red, are regularly arranged in parallel in the horizontal direction so that the three-color phosphor layers are embedded. In addition to the phosphor screen 8 having an integrated structure in which a black stripe layer elongated in the vertical direction is formed, non-luminous light of a certain width made of the same material as the black stripe layer is provided around the phosphor screen 8 so as to surround the phosphor screen 8. Part 2
8 is provided, and positioning marks 29 are provided in the non-light emitting portions 28 at both ends in the vertical direction. The positioning mark 29 is for setting the relative position between the phosphor screen 8 and the shadow mask, and is composed of five concentric circles having a diameter of 2 mm as the outermost circle and a line width of 0.05 mm. Corresponding to a plurality of mask pieces arranged in parallel in the horizontal direction, the non-light-emitting portions 2 at both ends in the vertical direction.
A plurality of them are formed in each of the eight.

In this color picture tube, a fixing member 9 for mounting a shadow mask, a stage, etc.
Is fixed to the outside of the non-light emitting portion 28 at both ends in the vertical direction.

Even in this color picture tube, the shadow mask is arranged in the horizontal direction corresponding to the number of horizontal divisions of the plurality of areas which are divided and scanned by the electron beams emitted from the plurality of electron guns. It is composed of a plurality of mask pieces arranged in parallel at predetermined intervals. In each of the mask pieces, the vertical direction is the longitudinal direction, and as shown in FIG. 7, a plurality of effective portions 19 corresponding to the number of divisions in the vertical direction of the above-described regions are ineffective portions 20 in which electron beam passage holes are not formed. Is formed in the vertical direction. Then, in the ineffective portions 20 at both ends in the vertical direction, adjacent to the effective portions 19 at both ends thereof, there are provided positioning holes 31 corresponding to the positioning marks 29 of the screen portion. A reference hole 32 for setting a relative position with respect to a mask frame described later is provided on the outer side in the vertical direction. The positioning aperture 31 is a square hole having a side length of 2 mm, which corresponds to the positioning mark having a diameter of 2 mm on the outermost circle. The reference hole 32 is a circular hole having a diameter of 1 mm.

As shown in FIG. 8, the mask frame has a section L similar to the mask frame of the first embodiment (see FIG. 3).
A pair of side portions 22 having a character shape, a pair of mask piece attachment portions 23 having an L-shaped cross section provided so as to cover both end portions of the pair of side portions 22, and an intermediate portion of the pair of side portions 22. The reinforcing piece 24 is formed into a rectangular frame shape and the fixing pieces 12 are attached to the side surfaces of the mask piece attaching portion 23. Further, in the mask frame 11 of this example, a reference hole 33 corresponding to the reference hole 32 of the mask piece is provided on the upper surface of the mask piece attachment portion 23. The reference hole 33 has the same shape and size as the reference hole 32.

A color picture tube having such a screen portion, shadow mask and mask frame is assembled as follows. The fixing members 9 are attached by frit glass to both ends of the face plate 1 in the vertical direction. Then, a screen portion is formed on the inner surface of the face plate 1 to which the fixing member 9 is attached by the master mask method in photo printing. That is, as in the case of a normal black stripe type color picture tube, first, the photosensitizer,
Using black paint or the like, the black stripes of the phosphor screen 8, the non-light emitting portion 28 surrounding the peripheral portion thereof and the positioning marks 2 in the non-light emitting portions 28 at both ends in the vertical direction thereof.
9 is formed. Then, using a photosensitive phosphor slurry, a stripe-shaped three-color phosphor layer is formed in the gap between the black stripes. Then, an aluminum film is vapor-deposited on the back surface of the black stripe and the three-color phosphor layer to form a screen portion.

On the other hand, apart from the formation of the phosphor screen 8, a mask piece is formed by a photo-etching method similarly to the shadow mask of a normal color picture tube, and the mask piece is formed by using an assembling jig. The reference hole 32 formed in the piece M and the reference hole 33 formed in the mask frame 11 are aligned by positioning, and a tension weaker than the tension finally applied to the mask piece M is applied to the mask. Mask piece attachment portions 23 at both ends of the frame 11
Laser spot welding to 1mm pitch spot welding. The electron gun is sealed in each neck of the plurality of funnels 4.

Then, first, using an assembling jig, as shown in FIG.
As shown in, the stage 13 is positioned and attached to the fixing member 9 attached to the inner surface of the face plate 1. Further, the face plate 1 to which the stage 13 is attached is fixed to an assembly jig, and the mask piece M attached to the mask frame 11 is arranged at a position in contact with the stage 13 attached to the fixed face plate 1. Then, the positioning mark 29 of the screen portion 8 formed on the inner surface of the face plate 1 and the positioning opening 31 formed in the mask piece M are aligned as shown in FIG. The fixing piece 12 attached to the fixing member 9 is welded to the fixing member 9. The positioning marks 29 of the screen portion 35 and the positioning holes 31 formed in the mask piece M are aligned with each other by the positioning marks 2
Since 9 and the positioning aperture 31 are located apart from each other,
A bifocal optical system capable of synthesizing images at different focal positions and observing in a plane is used, and the lens system for focusing on the positioning mark 29 of the screen portion is fixed, and the mask piece M is positioned and opened. The measurement can be performed with a measuring device in which the lens system for focusing on the hole 31 has a variable focal position.

After the positioning mark 29 of the screen portion and the positioning opening 31 of the mask piece M are aligned as described above, the fixing piece 12 fixed to the mask frame 11 is fixed to the face plate 1. It is gradually pushed in until it contacts the member 9, and the tension of the mask piece M is increased by the stage 13 and the flatness of the mask piece M is corrected. In this state, the focus of the measuring device using the dual focus optical system is aligned with the positioning mark 29 of the screen portion and the positioning opening 31 of the mask piece M, and the positioning mark 29 and the positioning opening 31 are misaligned. Make sure it is not. In this case, if they are misaligned, the alignment is performed again, and the positioning mark 29 and the positioning aperture 31 are not misaligned, and the fixing piece 12 is welded to the fixing member 9.

Then, using an assembling jig, the face plate 1 to which the mask piece M is attached, the side wall, the rear plate, and the plurality of sealed funnels of the electron gun are combined in a predetermined relationship, and they are combined. Are joined together by frit glass. Then, it is manufactured by subjecting it to exhaustion and other treatments in the same manner as in a normal color picture tube.

In addition to the above, as a method of manufacturing this color picture tube, a plurality of funnels having electron guns sealed in advance are joined to a rear plate, and a face plate 1 to which a mask piece M is attached, It can also be manufactured by other methods, such as joining together a side plate and a rear plate having a plurality of funnels joined together.

10 to 12 show the shadow mask 10
And Fig. 8 is another embodiment for positioning the screen 8. The phosphor screen 8 shown in FIGS. 10A and 10B has almost the same structure as that of the phosphor screen 8 shown in FIG. 6, except that the structure of the positioning mark 29 provided in the non-light emitting portion 28 is different. That is, it has a slit shape.
The positioning mark 29 (slit) is for setting the relative position between the phosphor screen 8 and the shadow mask 10, and is a slit having a line width of 200 μm.

The shadow mask 10 used in this embodiment has substantially the same structure as that shown in FIG. 11, except that the effective portion 19 of the shadow mask 10 is vertically extended by about 10 mm on one side. The positioning opening 31 (slit) is provided in the slit in the center of the area.
The positioning opening 31 is provided with reference to a portion where the slit width 200 μm of the shadow mask 10 is 50 μm, and the slit has a shape bulging inward, and the length of the bulging portion is about 1 mm.

As shown in FIG. 12, this positioning opening 3
1 (slit) is arranged at a position corresponding to the positioning mark 29 provided on the phosphor screen 8, and the positioning mark 29 and the positioning mark 29 are provided by the measuring device using the bifocal optical system as in the structure shown in FIG. The phosphor screen 8 and the shadow mask 10 are positioned by observing the positioning holes 31 at the same time. At this time, the observation image is observed as if the positioning mark 29 and the positioning aperture 31 completely overlap each other as shown in FIG. The feature of this embodiment compared with the embodiment shown in FIG. 7 is that the positioning aperture 31 has a shape similar to that of the slit array, and the shadow mask 1
When tension is applied to 0, it is possible to prevent tension imbalance or deformation due to the positioning aperture 31.

As described above, the reference is applied in any shape as in the positioning used in the present invention, but it is important to note that the reference on the phosphor screen 8 side is formed at the same time as the manufacture of the phosphor screen 8. It is desirable that the positional relationship between the two is accurately set and that the reference on the side of the shadow mask 10 is also formed simultaneously in the process of forming the slit rows on the shadow mask 10.

By constructing the color picture tube as described above, the following effects can be obtained in addition to the effects (a) to (f) described in the first embodiment. (G) A phosphor screen 8 on the inner surface of the face plate 1
Since the positioning mark 29 is formed at the same time when forming, the positioning mark 29 is always formed in a constant relationship with no displacement with respect to the three-color phosphor layer forming the phosphor screen 8. On the other hand, in the shadow mask, since the positioning aperture 31 is formed at the same time when the effective portion 19 of the mask piece M is formed, the positioning aperture 31 is always displaced with respect to the electron beam passage hole of the effective portion 19. Formed in a constant relationship without. Therefore, the positioning mark 29 of the screen portion and the positioning hole 3 of the mask piece M
By aligning 1 with each other, the phosphor screen 8 and the shadow mask can be aligned with high precision. (H) Since the positioning opening 31 is formed in the mask piece M and the positioning mark 29 of the screen portion can be seen through this positioning opening 31, a composite image of them can be obtained by a simple optical system. Therefore, the phosphor screen 8 and the shadow mask can be easily aligned. (I) Since the phosphor screen 8 and the shadow mask can be aligned with high accuracy by aligning the positioning mark 29 of the screen portion with the positioning opening 31 of the mask piece M, the mask piece M on the mask frame 11 can be accurately aligned. The mounting does not require much accuracy, and the mask frame 11 is masked by a simple means of aligning the reference holes 33 formed in the mask frame 11 and the reference holes 32 formed in the mask piece M. The piece M can be attached.

In the above embodiment, the positioning marks on the screen portion are concentric circles, and the positioning holes on the mask piece are square holes. However, these positioning marks and positioning holes may have other shapes, or cross lines. It is also possible to adopt a configuration in which the components are inserted and aligned.

Further, in the above embodiment, the diameter of the outermost circle of the positioning mark and the length of one side of the square hole of the positioning hole are equal, but the sizes of the positioning mark and the positioning hole may be different. Further, in the above-mentioned embodiment, the shadow mask has the case where the electron beam passing holes have the effective portion and the non-effective portion which are not formed. However, the present invention does not have some or all of the ineffective portions. Also applies to

Further, in the above embodiment, the measuring mark using the bifocal optical system is used to simultaneously observe the positioning mark of the screen portion and the positioning aperture of the mask piece to position the phosphor screen and the shadow mask. The phosphor screen and the shadow mask are aligned by another method, for example, the face plate is positioned and fixed with reference to the positioning mark, and then the mask piece is positioned with reference to the positioning aperture, and then the positioning is performed. The phosphor screen and the shadow mask can be aligned by mechanically aligning the mark and the positioning aperture.

[0076]

EFFECT OF THE INVENTION An envelope having a substantially rectangular face plate having first and second axes orthogonal to each other is provided, and a phosphor formed on the inner surface of the face plate so as to face the shadow mask. In a color picture tube in which a screen is divided into a plurality of regions and scanned by electron beams emitted from a plurality of electron guns, a shadow mask is provided with a plurality of masks having an effective portion in which a plurality of electron beam passage holes are formed. The pieces are arranged in parallel in the first axial direction,
The second axial end portions of each mask piece are fixed to the plurality of mask frames, one end portion is fixed to the inner surface of the face plate, and the other end portion passes through the inside of the mask frame, and the second end portion of each mask piece is fixed. By providing a pair of stages in contact with both axial end portions of the shadow mask, the shadow mask is constituted by a plurality of mask pieces arranged in parallel in the first axial direction, and the second axial end portions of each mask piece are formed. By fixing to the plurality of mask frames, the length of the shadow mask in the first axial direction can be shortened according to the number of mask pieces, and the tension applied to the shadow mask can be reduced. Therefore,
The structure of the mask frame can be made simple and lightweight. Also, by providing a pair of stages, one end of which is fixed to the inner surface of the face plate and the other end of which passes through the inside of the mask frame and contacts the second axial end portions of each mask piece, the shadow mask and the inner surface of the face plate are provided. The interval (q value) from the phosphor screen formed on the can be set by the height of the stage, and the height of the stage can be set with high accuracy by machining, so the accuracy of the mask frame,
It is possible to avoid the deviation of the q value due to the mounting accuracy of each mask piece to the mask frame and the like, and the influence of the deformation that occurs when the mask piece is welded to the mask frame on the effective portion. When each mask piece is brought into contact with the stage, the tension applied to the mask piece can be adjusted by adjusting the pressing amount of the mask piece against the stage. Also, by weakening the tension when attaching the mask piece to the mask frame in advance and weakening the tension when welding the mask piece to the mask frame, the deformation during mask piece welding is reduced and the mask piece is applied to the stage. When you touch
It is also possible to apply a desired tension, and it is possible to obtain a color picture tube that is highly productive and practical.

Further, an envelope having a substantially rectangular face plate having first and second axes orthogonal to each other is provided, and a luminescent color formed on the inner surface of the face plate so as to face the shadow mask. In a color picture tube in which a phosphor screen composed of a plurality of different types of phosphor layers is divided into a plurality of regions by an electron beam emitted from a plurality of electron guns and scanned, a shadow mask is provided with a large number of electron beam passage holes. A plurality of mask pieces having an effective portion formed with are arranged in parallel in the first axial direction, and the second axial end portions of each mask piece are fixed to the plurality of mask frames, and Positioning holes are provided at both ends in the second axial direction outside the effective portion of each mask piece, and the positioning holes corresponding to the positioning holes in each mask piece are provided at both ends in the second axial direction of the phosphor screen. When the marks are provided, the second axial end portions of each mask piece are fixed to a plurality of mask frames, so that the length of the shadow mask in the first axial direction can be made equal to that of the color picture tube. Can be shortened according to the number of the masks, and the tension applied to the shadow mask can be reduced. Therefore, by doing so, the structure of the mask frame can be made simple and lightweight. Further, positioning openings are provided at both ends in the second axial direction outside the effective portion of each mask piece,
By providing the positioning marks corresponding to the positioning holes of each mask piece on both ends of the phosphor screen in the second axial direction, the masks spaced from each other by a predetermined distance by aligning the positioning holes and the positioning marks. The piece and the phosphor screen can be directly aligned with high precision, and a color picture tube with more mass productivity and practicality can be obtained.

Further, a plurality of mask pieces having an effective portion in which a large number of electron beam passage holes are formed and positioning holes formed in both ends of the second portion in the second axial direction outside the effective portion are formed in the first axis. A plurality of shadow masks arranged side by side in parallel with each other, a phosphor screen formed on the inner surface of the face plate so as to face the shadow mask, and positioning of the mask pieces on both ends of the phosphor screen in the second axial direction. A screen portion having a plurality of positioning marks formed corresponding to the apertures, and a plurality of phosphor screens are provided through an effective portion of each mask piece by an electron beam emitted from a plurality of electron guns. In a method of manufacturing a color picture tube that is divided into regions and scanned, the effective portion and the positioning aperture of each mask piece are formed in the same step, and the phosphor screen and the positioning mark of the screen portion Are formed in the same step, and the phosphor screen and each mask piece are aligned by coaxially positioning the positioning opening and the positioning mark. With respect to the effective portion and the phosphor screen, the phosphor screen and the mask piece can be always formed in a fixed relationship with no positional deviation, and the positioning aperture and the positioning mark are coaxially positioned. The position of the color picture tube can be adjusted with high accuracy, and a color picture tube with excellent mass productivity and practicality 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 sectional view taken along line BB thereof.

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

3 (a) and 3 (b) are perspective views showing a structure of a mask frame of the color picture tube of the embodiment shown in FIG. 1, respectively.

4 (a) to 4 (c) are perspective views showing a structure of a stage of the color picture tube of the embodiment shown in FIG. 1, respectively.

5 (a) to 5 (d) are views showing a main configuration of the color picture tube of the embodiment shown in FIG. 1, respectively.

FIG. 6 (a) is a plan view showing the configuration of a screen portion of a color picture tube of another embodiment of the present invention, and FIG. 6 (b) is a view showing its positioning mark.

7 is a plan view showing the configuration of a mask piece of the color picture tube of the embodiment shown in FIG.

8 is a perspective view showing a structure of a mask frame of the color picture tube of the embodiment shown in FIG.

9 (a) and 9 (b) are diagrams showing a main configuration for explaining a method of manufacturing the color picture tube of the embodiment shown in FIG. 6, respectively.

FIG. 10 (a) is a plan view showing another example of the configuration of the screen portion of the color picture tube of another embodiment of the present invention,
FIG. 10B is a diagram showing the positioning mark.

11 is a plan view showing another example of the configuration of the mask piece of the color picture tube of the embodiment shown in FIG.

12 (a) and 12 (b) are diagrams showing another example of the main configuration for explaining the method of manufacturing the color picture tube of the embodiment shown in FIG. 6, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Face plate 5 ... Envelope 8 ... Phosphor screen 9 ... Fixing member 10 ... Shadow mask 11 ... Mask frame 12 ... Fixing piece 13 ... Stage 14 ... Fixing piece 19 ... Effective part 20 ... Ineffective part 22 ... Side Part 23 ... Mask piece attaching part 24 ... Reinforcing part 28 ... Non-light emitting part 29 ... Positioning mark 31 ... Positioning opening 32 ... Reference hole 33 ... Reference hole 35 ... Screen part M1 to M5 ... Mask piece R1 to R20 ... Area

Claims (3)

[Claims] 1. An envelope having a substantially rectangular face plate having first and second axes orthogonal to each other, and a plurality of masks having an effective portion having a large number of electron beam passage holes formed therein. Shadow masks in which pieces are arranged in parallel in a first axial direction, a plurality of mask frames for fixing the second axial end portions of each mask piece, and one end portion fixed to the inner surface of the face plate. A pair of stages, the other end of which is in contact with each of the mask pieces or the second axial ends of the mask frame, and a phosphor screen formed on the inner surface of the face plate so as to face the shadow mask, A plurality of electron guns for emitting electron beams for scanning by dividing the phosphor screen into a plurality of areas through the effective portion of each mask piece. Image tube. 2. An envelope having a substantially rectangular face plate having first and second axes that are orthogonal to each other, and an effective portion having a large number of electron beam passage holes formed therein. A shadow mask comprising a plurality of mask pieces, each having a plurality of positioning apertures provided at both ends in the second axial direction outside the unit, arranged in parallel in the first axial direction, and the shadow mask on the inner surface of the face plate. A phosphor screen formed to face each other, and a screen portion having a plurality of positioning marks provided at both ends in the second axial direction of the phosphor screen so as to correspond to the positioning openings of the mask pieces, A color picture tube, comprising: a plurality of electron guns for emitting electron beams for scanning by dividing the phosphor screen into a plurality of areas through the effective portion of each mask piece. 3. A plurality of mask pieces each having an effective portion in which a large number of electron beam passage holes are formed, and a plurality of mask pieces having positioning apertures formed at both ends in the second axial direction outside the effective portion are first axes. Direction, a plurality of shadow masks are arranged in parallel, a phosphor screen formed on the inner surface of the face plate so as to face the shadow mask, and the mask pieces of the mask pieces are formed at both ends in the second axial direction of the phosphor screen. A screen portion having a plurality of positioning marks formed corresponding to the positioning openings, and the phosphor screen is moved through the effective portion of each mask piece by an electron beam emitted from a plurality of electron guns. In a method of manufacturing a color picture tube that divides into a plurality of regions and scans, an effective portion and a positioning opening of each mask piece are formed in the same step, and a phosphor screen of the screen portion is formed. And the positioning mark are formed in the same step, and the phosphor screen and the mask pieces are aligned by coaxially positioning the positioning aperture and the positioning mark. Production method.