JPS59149632A - Color picture tube - Google Patents

Abstract

PURPOSE:To obtain a highly practical color picture tube by welding metal chip at one end of fixing member to the skirt section of at least one of a plurality of masks while that at the other end to the frame or the skirt section of other mask thereby maintaining a plurality of masks at predetermined interval and fixing while maintaining insulation. CONSTITUTION:Two simultaneously pressed masks 7, 8 are applied on a frame 16 then the mask 8 is welded to the frame while the mask 7 is lifted by a vacuum suction system to be set with predetermined interval. An insulator film 31 is inserted through the skirt sections 71, 81 of said masks 7, 8 where the skirt section 81 of first mask 8 is welded directly to the frame 16. While the skirt section 71 of second mask 7 is fixed to the opposite ends of insulator 32 while maintaining insulation against the frame 16 through a fixing member 40 having metal chips 33, 34. The fixing member 40 can be manufactured easily by burrying metal chips 33, 34 at the opposite ends of glass insulator 32.

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. The present invention relates to a color picture tube having a structure arranged such that a mask passes through the color picture tube, and particularly to a mask fixing structure thereof.

[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 applies a predetermined potential difference to a plurality of masks facing each other with a predetermined interval, and forms an electrostatic lens for the electron beam passing through each aperture of the mask. This type of mask focusing color picture tube is disclosed in, for example, U.S. Pat. No. 2,971,1.
No. 17, U.S. Patent No. 3,398,309, Special Publication No. 38
This is disclosed in Japanese Utility Model Publication No.-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. 57575-1983, 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 impact the designated phosphors on the screen, resulting in so-called mislanding, resulting in poor color purity. To prevent this, a two-mask configuration is used to block unnecessary single-beam beams due to the impact of the phosphor, thereby increasing the temperature of the second mask, which is important for the color purity function. It is designed to suppress as much as possible.

In the mask focusing type color picture tube and the color picture tube having 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 with such a structure.

For example, Japanese Patent Publication No. 47-8261, Japanese Patent Publication No. 47-28
A method of manufacturing a mask having the above structure has been proposed in Japanese Patent No. 188, etc., but this method lacks moldability of the mask because an insulator, such as a glass insulator, is disposed over the entire surface of the mask except for the aperture portion. The charging phenomenon caused by the beam impact on the insulator section adversely affects the beam passing through the decoy aperture section, which is impractical.

On the other hand, in JP-A-57, a practical mask forming method was developed in which the apertures of the plurality of masks could be correctly matched one-to-one by overlapping and press-molding a plurality of flat masks at the same time. -13874
This is proposed in Publication No. 6.

In the above mask forming method, when press forming is performed in the same way as a normal mask, and the loose skirt part on the peripheral side of the mask is deeply folded, even if multiple molded masks are fixed at a predetermined interval, each molding in the skirt part will be Masks may come into contact. Therefore, it is not possible to apply different potentials to each of multiple masks,
Even if a plurality of masks are made to have the same potential, since each mask is in contact with each other, a problem arises in that a temperature change in one mask is rapidly transmitted to other masks.

For this reason, there are methods to insert an insulator into the skirt portion of the mask in advance, or to set the skirt portions of multiple masks alternately so that the skirt portions do not overlap, but masks with these structures are press-molded. Each effective part of a multi-layered mask must be fixed at a predetermined interval. At this time, since the plurality of masks must maintain insulation, it is not possible to weld and fix all the masks to the frame at their skirt portions. Even if a good heat-resistant adhesive is used, it is extremely impractical due to its poor workability.

[Purpose of the invention]

SUMMARY OF THE INVENTION An object of the present invention is to provide a highly practical color picture tube in which a plurality of masks are fixed at predetermined intervals and insulating properties in a color picture tube having a plurality of masks.

[Summary of the invention]

The present invention provides at least one of a plurality of molded masks.
One mask is fixed to the frame by its skirt part, and the other masks are kept at a predetermined distance from each other, and then a fixing member having metal pieces at both ends of the insulator is used to connect the skirt part to the frame or the skirt of the other mask. The parts are welded and fixed.

[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 a mask manufactured according to the present invention is applied, and shows a schematic configuration 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 (4) connected to the side wall of the face plate through a funnel (3). , an electron gun (5) installed in the neck (4), and a deflection device (6) installed on the outer wall from the funnel (3) to the neck (4).
and a mask (7) having a large number of apertures (14) facing the screen (1) at predetermined intervals;
The mask (a mask having a large number of aperture groups facing each other at predetermined intervals on the electron gun (5) side from the force)
8), and a conductive film (9) uniformly applied to the inner wall of the funnel part (3) up to a part of the neck part (4). On the screen surface (1), metal-backed three-color phosphors A4 are regularly arranged.

A pin (17) for holding the frame αe is provided on the inside side of the face plate (2), and the frame (16)
The frame (1e) is held by the elastic body (1e) being welded to the pin (17). Two masks (8) are fixed to the frame ue while maintaining insulation. ing.

Funnel part (3) has 21 hard buttons,
+20) are embedded, one button (l is in contact with the conductive film (9), and the other button (2@ is in contact with the conductive film (9)
9) so that different potentials can be applied from the outside.

A mask (8) on the electron gun side is connected to a conductive film (9) applied to the funnel part by a connector eυ through a frame uQ.
), and at the same time, it is also in contact with the screen surface (1) via the frame H and pin αη, and a high anode voltage is applied from the outside.

On the other hand, the mask on the screen side (the force is in direct contact with the button (2) which is insulated from the conductive film by the connector@), and a voltage slightly lower than the anode control voltage is applied from the outside.

In the above configuration, three electron beams Cl0), (11), (l) generated from the electron gun (5) are deflected by the deflection device (6), and the aperture (15) of the first mask (8) is deflected by the deflection device (6). ), it passes through the aperture 0 of the second mask (7) and reaches the screen surface (1), receiving the lens effect, causing the corresponding phosphor to emit light. Therefore, the two masks (force, (8 ), each aperture α4),
(15) must have a one-to-one correspondence. A mask constructed in this way can be manufactured, for example, by aligning two flat masks, fixing them with a filler or the like, press-molding them at the same time, and then fixing and holding them at a predetermined interval. At this time, insulation is maintained by inserting an insulating film into the skirt portions of the two masks in advance. To set the predetermined spacing, for example, two masks (
Power, (8) wave frame tmvrc, one mask (
8) is welded and fixed to the frame after vacuum suction device (:!A
This can be done by applying another mask (by increasing the force upward), etc. Then, after setting the two masks (force, (8)) at a predetermined interval, the skirt part (71),
(81) are welded and fixed via a fixing member (not shown) and a mask frame (16), respectively.

FIG. 3 is a schematic enlarged view showing the mask fixing structure. In Figure 3, the skirt portions (71) and (81) of the two masks (7) and (8) are covered with insulating films (3).
]) is inserted, and the skirt portion (81) of the first mask (8) is directly welded and fixed to the frame 4. - Manbou 2 mask (power skirt part (71) is an insulator (metal pieces on both ends of the mask, fixing part with (2) +1 (11 (
It is fixed at I while maintaining insulation from the frame ue. Such a fixing member (4@ is a metal piece N, C34) can be embedded in both ends of the glass insulator 0 and can be easily manufactured.

〔Effect of the invention〕

A plurality of masks having such a mask structure can be firmly fixed and held while maintaining insulation, and only a welding process is required for fixing and holding, so the working time can be significantly shortened. Therefore, it is more practical and economical than a structure in which the skirt portions of a plurality of masks are fixed and held using adhesive.

Although the above embodiment has been described with reference to a two-mask configuration, it goes without saying that the present invention is not limited to this and can be applied to a plurality of mask configurations.

[Brief explanation of drawings]

Fig. 1 is a schematic configuration diagram showing an embodiment of a color picture tube to which the present invention is applied, Fig. 2 is a schematic diagram for explaining the manufacturing process of the mask part in Fig. 1, and Fig. 3 is a fixing of the mask. It is a schematic enlarged view showing a structure. (Force...mask on the screen side (8)...mask on the electron gun side (IQ...frame G rotation...insulator), (b)...metal piece (41...for fixing) Patent attorney representing parts: Kensuke Norichika (and one other person)

Claims (1)

[Scope of Claims] A plurality of masks each comprising a curved surface portion having a large number of apertures on a certain curved surface and a skirt portion connected to the curved surface portion and holding the curved surface portion, and a frame supporting the plurality of masks. The curved surface portions of each mask are set at predetermined intervals, and at least one
In a color picture tube in which one mask is directly fixed to the frame by welding and the other mask is insulated and fixed by a fixing member including an insulator, the fixing member has one metal piece at one end of the insulator and one metal piece at the other end. Another metal piece is fixedly held at each of the ends, and the metal piece at one end is fixed to at least one of the plurality of masks.
A color picture tube, characterized in that the metal piece at the other end is welded and fixed to the skirt portion of one mask, and the metal piece at the other end is fixed to the frame or the skirt portion of another mask.