JPS594821B2 - Color picture tube and its manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a color picture tube and a method for manufacturing the same.

As shown in Fig. 1, a conventional color picture tube consists of a shadow mask 2 attached to the inside of a panel 1 and a fluorescent film (including dots and stripes) 3 formed on the inside of the panel with an extremely precise positional relationship. The shadow mask 3 is connected to a panel pin 4 installed on the inner wall of the panel.
The shadow mask is attached and swung by a mask holder 5 fixed to the side wall of the shadow mask.

On the other hand, the fluorescent film is formed by an exposure method in order to have an accurate positional relationship with the shadow mask.

That is, each time a black coat (not shown) or a phosphor of each color is formed, a shadow mask is attached to the panel.
After exposure, the film is removed, developed, and installed repeatedly.

Therefore, the mask holder 5 and the panel bin 4 are attached to each other with extremely high precision, and the shadow mask 2 has a metal frame with an inverted cross section that has sufficient strength to prevent deformation due to attachment and detachment. (Frame) 6 is attached.

Furthermore, by attaching the metal frame, the thermal expansion of the entire mask cannot be ignored.In order to correct the landing error of the beam due to the thermal expansion of the entire mask, the mask holder 5 is made of bimetallic material with a calculated correction amount. 7 and leaf spring 8
It consists of

For the reasons mentioned above, conventional color picture tubes use glass bulbs (
The panel 1 and the shadow mask were both expensive and heavy, and the fluorescent film forming process required complicated equipment and manpower because the panel 1 and the shadow mask had to be moved as a pair.

As a way to eliminate the above-mentioned drawbacks, various proposals have been made for producing inexpensive color picture tubes by using flat glass in the panel, but in all of them, the process of forming the fluorescent film remains the same as before. Therefore, even if the metal frame is omitted in order to reduce the weight and cost of the mask, it is difficult to prevent the shadow mask from deforming because the shadow mask must be attached and detached, and the equipment and manpower are still the same as before. I needed it.

The object of the present invention is to overcome these drawbacks and provide an inexpensive and lightweight color picture tube by simplifying the method for forming a fluorescent film and improving the method for holding a mask.

The effect of the manufacturing method according to the present invention is further improved by combining it with the flat panel described above.

Next, the present invention will be described in detail using an example in which a flat panel is used.

FIG. 2 is a partially cut away perspective view of a flat panel color picture tube assembled in accordance with the present invention.

In FIG. 2, the fluorescent film 13 on the inner surface of the panel 11 is formed of a black coat, phosphors of various colors, and an aluminum film, as in the conventional case.

The shadow mask 12 has a through-hole surface portion and its periphery formed integrally into a box shape, and a plurality of holders 15 are fixed to the side wall portions 16 of the shadow mask 12 .

As will be described later, the shadow mask does not need to be attached or detached during the fluorescent film forming process, so it does not require a strong metal frame and is molded to have an appropriate side wall portion 16, or the side wall portion 16 is formed as necessary. A thin band-shaped metal plate that goes around the portion 16 may be attached for reinforcement.

On the other hand, on the inner surface of the panel at a position facing the holder 15, a fixing part 14 for fixing the holder 15 is attached and swung by solder glass 17 or the like.

Details of the holding body 15 and the fixing part 14 will be described later.

FIG. 3 is a diagram showing the through-hole surface of the shadow mask 12 shown in FIG. The shape of the reference holes 18, in which one reference hole 18 is bored at any plurality of points on the outside of the outer edge, is not limited to (and may be any shape such as a circle, square, oval, or triangle). But that's fine.

Additionally, it is usually easier to install the mask later by setting the position of the reference hole so that it has a positional relationship of 180 degrees on the vertical and horizontal center lines of the through-hole surface, but it is not necessarily limited to this. do not have.

In this embodiment, a case will be explained in which reference holes 18 are set at one location each on the top and bottom of the vertical center line as shown in FIG. 3.

FIG. 4 shows an example of the holding body 15 and the fixing part 14 adapted to the present invention, and this figure shows a state before the mask and the fixing part are fitted together.

Since the mask does not have a metal frame, the holding body 15 is formed of a spring with appropriate strength (to the extent that it does not deform the mask and does not cause vibration due to impact) without using a bimetal material, and is fitted into the fixed part 14. Convex protrusion 2 on the mating part
1, and is attached to the mask fixing part 14 at a position where the distance between the mask surface and the fluorescent surface becomes a specified value.

On the other hand, with the holding body 15 attached, the fixed part 14 fits into the protruding part 21 of the holding body 15 at a position where the distance between the mask surface and the fluorescent surface is constant, and this protruding part 21 is movable in the lateral direction. A freely horizontally elongated hole 22 is bored.

Further, this fixing portion 14 is fixed in advance at a prescribed position on the inner surface of the panel 11 with solder glass 17 or the like before the fluorescent film forming process.

The holding body 15 and the fixing part 14 may be fitted with each other as shown in the drawings in another embodiment.

Formation of a fluorescent film and attachment of a mask according to the present invention are carried out as follows.

That is, out of a large number of molded masks, several are prepared in advance as reference masks for each exposure process.

These reference masks are held on each exposure table while maintaining a prescribed positional relationship with each light source.

In addition, each exposure table has a panel position regulating section in which the panel is held based on several points out of the two sides that make up approximately 90 of the panels, and these regulating sections regulate the light source, mask, and panel for each exposure process. It is preset to have the following positional relationship.

In other words, the reference side of the panel is always moved so that it is in contact with the position regulating part of the exposure table, so that the photocuring agent (
(black coat pre-treatment), each red, light and green phosphor is exposed and attached to a prescribed position.

As shown in FIG.
5 is attached.

Three reference phosphor dots 25 are attached at one location using the reference holes of the reference mask corresponding to each color, but if the mask attachment described later is complicated, the dots to be used as the reference may be exposed. If the reference hole portions of the masks other than the mask to be used are covered, only one reference phosphor dot 25 will be attached, which is an easy solution.

Next, after the phosphor film is deposited, a metal back is applied. At this time, a shielding mask is placed on the reference phosphor dots so that the aluminum film 23 is not deposited on the reference phosphor dots 25, and vapor deposition is performed.

As a result, as shown at 25, the phosphor film forming process is completed while the reference phosphor dots remain exposed at positions 24 where the aluminum film 23 is not deposited.

To attach the shadow mask, as shown in FIG. 5, first, attach the holder 15 and the fixing part 14 to an arbitrary mask with the holder 14 attached and swayed in advance in the direction facing the fluorescent surface. Combine and place.

Further, the microscope 26 is held at an angle θ that coincides with the axis of the light beam passing through the reference hole calculated from the exposure light source position 27.
, move the shadow mask so that the reference hole 18 of the shadow mask for mounting matches the reference phosphor dot of the phosphor film, and when the reference points match, remove the holder 14 and the fixing part 15.
Fix by spot welding etc.

The shadow mask can be attached more accurately if the shadow mask is attached in combination with a holding jig that allows the mask and panel to move relatively parallel to the inner surface of the panel and a holding jig that moves in the rotational direction.

In FIG.
8 was used for alignment, but it goes without saying that various optical and electrical alignment methods can be applied as is, and alignment, spot welding, etc. can be performed automatically. be.

Further, when the fluorescent film is formed in a stripe shape, the movable direction of the mounting shadow mask by the combination of the holding body and the fixing part is limited to a direction perpendicular to the stripes, so that the holding body and the fixing part There is also an effect that the number of shadow masks can be reduced and the force applied to the shadow mask can be reduced.

Although the above description has been made using a flat panel, there is no difference in operation and structure even if the panel has a curved surface.

By using the structure and manufacturing method of the present invention, compared to conventional color picture tubes, there is no need to attach or detach the shadow mask, which simplifies the structure and holding mechanism of the shadow mask, and prevents any deformation of the shadow mask. It is also possible to save labor, improve the efficiency of the manufacturing process, solve mechanical positional accuracy, improve product quality and performance, and provide a lightweight, high-performance, inexpensive color picture tube.

FIGS. 6 to 11 are perspective views showing modified examples of the fixing part and the holding body used in other embodiments of the present invention. Next, the main parts will be explained with reference to each figure.

In the figure, parts using the same reference numerals as in FIG. 4 indicate the same parts.

That is, FIG. 6 shows two spring members 37.3 as a holding body.
Plate body 34 supported by 8 and having a plurality of protrusions 35,36
In addition, the fixing part 31 has the protruding part 35.3.
The reference hole 18 is also rectangular.

With such a structure, the position of the shadow mask with respect to the panel 11 can be more reliably regulated.

In FIG. 7, a protrusion 44 is formed on the auxiliary holder which is formed integrally with the holder 43 and bent at right angles along a line 45, and the panel 11 has a long hole 42 that fits into the protrusion 44. A fixing portion 41 is provided.

By adopting such a structure, attachment of the shadow mask 12 can be further simplified.

In FIG. 8, a long hole 54 is provided in the holding body 53, and the fixing part 5
1 is provided with a protrusion 52, and FIG.
3 is provided with a circular hole portion 64, a step portion 62 is formed in the fixing portion 61, and a protrusion portion 66 is further provided near one end of the auxiliary fixing piece 65, so that the panel 11 and the shadow mask rotation rear step portion 62 and the auxiliary portion are provided. It has a structure that moves and fixes the fixing piece in the direction of the arrow.

FIG. 10 shows an example in which the panel has a peripheral edge 11, and the holder 73 consists of an inclined part 75 and a part parallel to the panel, and a protruding part 74 is formed in this part. A fixed part having a long hole part 12 that fits into the protrusion part 74 is fixed.

Further, in FIG. 11, the fixing part 81 has a groove at its tip, and the flat plate-shaped holder 82 having no protrusion in this groove is shown by the arrow 8.
It has a simplified structure to be inserted as shown in 3.

[Brief explanation of the drawing]

FIG. 1 is a partially cutaway perspective view for explaining the structure of a conventional color picture tube, FIG. 2 is a partially cutaway perspective view for explaining the structure of an embodiment of the color picture tube of the present invention, and FIG. FIG. 4 is a front view of a reference mask and a mounting shadow mask applied to the color picture tube shown in FIG. , FIG. 5 is an explanatory diagram of a method for fixing the shadow mask for mounting the color picture tube shown in FIG. 2 in a predetermined position, and FIGS.
FIG. 1 is an enlarged perspective view of a main part showing the positional relationship between a holder and a fixing part applied to each of the other embodiments of the color picture tube of the present invention. 1.11.11... Hanel, 2,12...
・Shadow mask for installation, 3, 13... Fluorescent film, 18° 18... Reference hole, 9, 19...
... Electron beam passage hole, 23 ... Aluminum film, 25 ... Reference phosphor dot, 26 ...
...Alignment device, 14,31°41.5L 6L
7L 81・・・Fixed part, 15°34.43
, 53, 63, 73.82...Holding body.

Claims (1)

[Scope of Claims] 1. A mounting shadow mask having a plurality of reference holes for alignment with each of a plurality of reference phosphor dots formed on the inner surface of a panel; A plurality of fixed holding bodies and a fixing part implanted in the panel so as to be relatively movable by fitting with the holding bodies in a plane substantially parallel to the inner surface of the panel. A color picture tube, wherein the holding body and the fixing part are fixed based on the alignment. 2. A reference mask having a reference hole at the same position as a mounting shadow mask to which a plurality of holders are fixed is mounted,
and a step of forming a fluorescent film and reference phosphor dots on the inner surface of the panel using an exposure device having a panel position regulating section, and a step of fitting the holding body and the fixing section implanted in the panel to a step of supporting the mounting shadow mask so as to be movable in a plane substantially parallel to the inner surface of the panel; a step of aligning the reference hole and the reference phosphor dot; and the step of holding the shadow mask. 1. A method of manufacturing a color picture tube, comprising the step of fixing a body and a fixing part. 3. The color image receiving device according to claim 2, wherein the fluorescent film is in the form of stripes, and a holder and a fixing part are provided so that the shadow mask for attachment can be moved in a direction perpendicular to the stripes. Method of manufacturing tubes.