JPS5978428A - Mask for color picture tube - Google Patents

Abstract

PURPOSE:To obtain a mask which provides no deformation and displacement and assures good insulation property by forming the of non-effective part of skirt and curved surface of mask in the opposing side among a plurality of masks thinner than the other part and by disposing an insulator to such portion. CONSTITUTION:A greater part 37 of the non-effective area 36 having no aperture provided at the periphery of effective area 35 having aperture 34 of the first flat mask 31 is formed thinner than the effective area 35 of the intrinsic flat mask by the half-etching process. An insulating film sheet 38 is placed on this thinner part 37, another second flat mask 40 having the reference holes 30 is also placed thereon through alignment with the reference pins 32. Finally an upper plate 41 is placed thereon. Thereby, the mask for a color picture tube which assures excellent insulation characteristics.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention comprises a plurality of masks that face each other at a predetermined distance from each other in close proximity to a screen surface, and each aperture of the plurality of masks is exposed to an electron beam. Concerning a color picture tube mask that has a structure that allows it to pass through,
In particular, it concerns the mask structure.

[Technical background and problems of the invention]

A mask focusing type color picture tube is well known as a color picture tube having a plurality of mask structures.

A mask-focusing color picture tube consists of a plurality of masks C facing each other at regular intervals, each applying a predetermined potential difference to form an electrostatic lens for the electron beam passing through each aperture of the mask. The utilization rate of the electron beam can be significantly increased by this method, and such a mask focusing type color picture tube is disclosed in, for example, U.S. Pat. No. 2.971.
．． No. 117, US Pat. No. 3,398,309, Japanese Patent Publication No. 38-22030, Japanese Utility Model Publication No. 47-20451, etc.

Further, as other examples of color picture tubes having the above structure, there are two masks such as those shown in Japanese Patent Publication No. 55-2698, Japanese Patent Application Laid-open No. 57575-1982, Japanese Utility Model Application No. 93769-1983, etc. There is a color picture tube in the composition.

This is because in a color picture tube with a normal one-mask configuration, the mask is thermally deformed due to the impact of the electron beam on the mask, and the electron beam does not hit the designated phosphor on the screen, causing so-called mislanding. In order to prevent this, the purity is degraded, so in order to prevent this, the first mask blocks unnecessary electron beams due to the impact of the phosphor, and the second mask is equipped with a heavy-duty color purity function. It is designed to suppress the temperature rise as much as possible.

In the mask-focusing color picture tube and the color picture tube with two masks for preventing mislanding, the apertures of the plurality of masks must be arranged in correspondence with each other on the entire surface of the mask. It is extremely difficult to manufacture a mask having such a structure.

For example, Japanese Patent Publication No. 47-8261, Japanese Patent Publication No. 47-28
A method for manufacturing a mask having the above structure has been proposed in Publication No. 188, but this method involves distributing an insulator, such as a glass insulator, over the entire surface of the mask except for the aperture portion, which may result in poor formability of the mask. , a charging phenomenon occurs in the insulator section due to the beam impact, and the beam passes through the aperture section.

In contrast, a practical mask forming method has been proposed in Japanese Patent Application Laid-Open No. 2003-120001 that allows the apertures of the plurality of masks to correspond one-to-one by stacking a plurality of flat masks and performing five nibless molding at the same time. 57-138
No. 746 is proposed.

In the above-mentioned mask molding method No. 2, when press molding is performed in the same way as a normal mask, and the peripheral part of the mask, the so-called skirt part, is deeply folded, even if the plurality of molded masks are fixed at a predetermined interval, the skirt part will not work properly. There is a risk that each molded mask will come into contact with each other. Therefore, it is not possible to apply different potentials to each of multiple masks,
Even if multiple masks are made to have the same potential, since each mask is in contact with each other, problems such as temperature changes in one mask will be quickly transmitted to other masks will occur. To solve this problem, C: A method of inserting an insulator into the skirt portion of the mask in advance can be considered, but in the above-mentioned mask forming method in which multiple flat masks are pressed together and press-molded at the same time, If an insulator is inserted between the masks, the thickness of the insulator may cause deformation or misalignment during press molding.

[Purpose of the invention]

An object of the present invention is to obtain a color picture tube mask that does not deform or shift in position even when a number of masks are brought into close contact with each other and press-molded at the same time, and that maintains good insulation properties.

[Summary of the invention]

According to the present invention, at least one of the several masks includes a skirt portion on the side facing the other mask, or at least a portion of the ineffective portion on the curved surface. The thickness of the mask is made thinner than the original thickness of other parts of the mask, and an insulator is placed in that part.This makes it possible to press multiple masks closely together at the same time, reducing deformation. This is a color picture tube mask with good insulation properties.

[Embodiments of the invention]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is an example of a color picture tube to which the present invention (a mask made from the second method) is applied, and shows the schematic structure of a mask focusing type color picture tube.

The mask focusing type color picture tube shown in FIG. 1 mainly consists of a face plate (2) having a screen surface (1), and a neck (2) connected to the side wall of the face plate (2) with a funnel (8). 4), an electron gun (5) built into the neck (4), and a deflection device f() mounted on the outer wall from the funnel (Ill) to the neck (4).
6) and a mask (γ) having a large number of apertures +14) arranged opposite to the screen (1) at predetermined intervals.
a mask (8) having a large number of apertures (I5) arranged oppositely at a predetermined distance from the mask (γ) toward the electron gun (6); and an inner wall C2 of the funnel portion (8) and the neck portion. (4) and a conductive film (9) uniformly coated with a certain dimension. Three-color metal-backed phosphors (18) are regularly arranged on the screen surface (1). A bin (17) that holds the frame (16) is provided on the bent inner wall of the 7 ace plate (2), and the elastic body θ8) welded to the frame (16) fits into the bin a7) r2. By this frame 06 wins (retained. Frame (16) has mask (8)
is welding 1. The other mask (7) is fixed to the mask (8) with adhesive.

Funnel part (8152 has two buttons α1. (20)
is embedded, and one button α11 has a conductive film (9
), and the other button (a) is insulated with a conductive film (9) so that different potentials can be applied from the outside.
It's two.

The mask (8) on the electron gun side is in contact with the conductive film (9) applied to the funnel part by the connector (21) through the frame (16), and at the same time, through the frame (10) and via the bottle a7). It is also in contact with the screen surface (1), and a high anode voltage is applied from the outside.

On the other hand, the mask (7) on the screen side is in direct contact with the Button Co., Ltd., which is insulated from the conductive film by a connector, and a lightning voltage slightly lower than the anode high voltage is applied from the outside.

In the above configuration, three electron beams 'Qo+, DI), (formerly deflected by the deflection device (6)-) generated from the electron gun (6) are deflected by the first mask (8).
-Cha (15), receives the lens effect, passes through the anode (Q) of the second mask (γ), reaches screen surface (1)C, and causes the corresponding phosphor to emit light by impact. Therefore two masks (7), (for each aperture of 81),
05) must have a one-to-C2 correspondence, respectively. A mask configured as described above can be manufactured, for example, by the following method.

As shown in FIG. 2, a flat first flat mask 131) having two reference holes 1'1tl) is placed on a box-shaped fixed plate (83) having a reference pin 132+ and a reference hole (1'1tl). At this time, the first flat mask (81) is placed around the effective part 9m where the aperture is present (2) and the non-effective part where the aperture is not present (the majority of the size ( 37) is formed by half-etching so that its thickness is thinner than the thickness of the effective part (end), which is the original thickness of the flat mask.
Place the insulating film sheet (881) on 871, then place another flat mask Wζ of Kaku2 which also has a reference hole (size), aligning it with the reference pin a, and place the upper plate on the thread layer. 2 sheets The flat mask 1llll, M and the upper plate fl) are made of iron plate or fixed plate (88)6 stainless steel or the like.

The above-mentioned box-shaped fixed plate (under 83I there is a heater ■, and below it an electromagnet - is set, and there are two flat masks on one foot plate), a seagull and an upper plate...) The placed electromagnet (6) is operated to bring these three iron plates into close contact. After that, the heater was operated and the box-shaped fixed plate 188) was removed.
Heating a sheet of iron plate, then turning it into melted paraffin.)
is injected into the apertures of the two masks.

Next, the heater decoy is stopped, and after the paraffin 4$41 injected into the aperture of the mask is cooled and solidified, the operation of the electromagnet (g) is stopped. After that, two flat masks + 1'lll that were tightly fixed with paraffin,
Take out H from the fixed plate (88). The two flat masks manufactured in this manner have the apertures and inclinations of each mask arranged in a correct one-to-one correspondence as shown in FIG. 3, and two 7-rat masks 1811. The apertures of each of the two masks are filled and solidified with 60 parts of paraffin in a state where they are in close contact with each other on the entire surface of the two flat masks. It is firmly fixed.In addition, the third
The figure is a sectional view taken along the line XX in FIG. 2.

The two flat masks produced in this manner are simultaneously press-molded to form a shape having a surface 1161 with a constant curvature and a skirt portion supporting the surface 1161, as shown in FIG. At the same time [the two nibless-molded masks were later destroyed in the aperture part of the mask, 06]
The space between the paraffins filled and solidified is removed by thermal dissolution or chemical dissolution (for example, washing with a trichloride solution), the two masks are shifted, and the curved surface portions tia+ of the masks are set and fixed at a predetermined interval C2. At this time, wrinkles ←Q) are formed between some of the corners of the shaped mask due to press distortion, so in order to make it easier to shift the two molded masks, some of the four corners of one mask are cut in advance. It is also possible to leave the mask structure removed. To fix the two masks, first, as shown in Fig. 3, the second mask curve is welded to the frame (frame 81) fixed to the jig, and then the first mask (81 ) may be fixed to the second mask or d frame frame 0) with adhesive or the like. FIG. 5 shows a Z-Z cross section of FIG. 4.

Part 1: Detailed specifications of the embodiment are as follows, for example.

The outline of the flat mask is the first flat mask (31)
is about 421 x 328 m, the second 7-rat mask size is about 423 x 330 m, and the plate thickness is the same as the first. The original thickness of the iron plate for both the second flat mask is 0.3 m,
The thickness of the thin part of the first flat mask is 0.2 m.
, the thickness of the insulating film sheet (■) is 0.1 m, and the length of the skirt portion (b) of the molded first mask is approximately 1 m.
The width of the insulating film sheet on the curved surface of 5 sheaths is approximately 311J
It is.

The distance between the curved parts of two over-molded masks is 1d0.5
It's the same. A polyimide film sheet is used as the insulating film sheet.

The one with two mask composition made by illumination with
, the two masks are insulated by an insulating film sheet at the skirt portion, and different voltages can be easily applied to the two masks. Also, the insulating film sheet) 6M is the skirt part W! Since it extends not only to the + but also to a part of the @ phrase on the curved surface, this part has the advantage of increasing the creepage distance between the two masks.

In the above embodiments, the thickness of the insulating film sheet was set to be equal to the half-etched thickness of the thin part of the first flat mask, but the present invention is not limited to this. It may be thicker than the sheet thickness. In this case, C2 can be made of another metal and the total thickness can be made constant.

Generally, when half-etching a flat mask, it is performed at the same time as etching the apertures in the effective area, so the amount of half-etching is greatly influenced by the progress of etching the apertures in the effective area.

Therefore, it is not necessarily possible to make the amount of half-etching equal to the thickness of the insulating film sheet, so it is preferable to adjust it as described above depending on the etching retention.

Further, in the above embodiment, the thin wall portion is provided on the first flat mask by half etching, but the present invention is not limited to this, and the thin wall portion may be provided on the second flat mask. It's not even until 1.

In the above embodiment, the apertures of the two flat masks are placed in a one-to-one correspondence, brought into close contact with each other by magnetic force, and fixed with paraffin. Even if it is not used, a method such as that described in JP-A-57-138746, for example, may be used.

Furthermore, although the above embodiment is an example in which the mask structure of the present invention is applied to the mask focusing type color picture tube f2, the present invention is not limited to this, and the present invention is not limited to this, but the present invention is also applicable to a two-mask structure for preventing mislanding due to thermal deformation of the mask as described above. It can also be applied to masks.

Although the above embodiment describes a two-mask configuration, the present invention is not limited to this, but it goes without saying that it can also be applied to a plurality of mask configurations.

〔Effect of the invention〕

As described above, according to the present invention, an insulating film sheet is set in advance between each of a plurality of flat masks, and then the plurality of flat masks are laid together to form a uniform thickness over the entire surface. Even with nibless molding, if each mask is brought into gas contact for 1 hour, it can be fixed and held at a predetermined interval, and a highly practical color picture tube having a multi-mask configuration can be obtained.

[Brief explanation of the drawing]

FIG. 1 is a schematic configuration diagram showing an example of a color picture tube to which the present invention is applied, FIG. 2 is a schematic exploded assembly diagram showing a method of assembling a mask to explain the present invention, and FIG. XX sectional view, FIG. 4 is a general view of the mask of the press molding layer, and FIG. 5 is a schematic sectional view for explaining the assembly of a plurality of masks. 31... First mask 36... Ineffective part 37.
・Thin wall part 38 ・Insulator film sheet 40・
・Second mask

Claims (1)

[Claims] A collar in which a plurality of masks are fixedly held at a predetermined IMJ interval, each consisting of an effective part having a large number of apertures on a certain curved surface and a skirt part that has an ineffective part around which there is no aperture and holds them. In the picture tube mask, the front-QiL includes the skirt portion of at least one of the plurality of masks on the side facing the other mask, or the skirt portion and the curve m
For a color picture tube, characterized in that the thickness of at least a part of the mask in the ineffective part on i is formed to be thinner than the original thickness of the mask in other parts, and an insulator is disposed in that part C. mask.