JPS5981837A - Color picture tube - Google Patents

Abstract

PURPOSE:To facilitate permeance of filler to aperture section by forming circumferential section of a plurality of masks linearly into thick section and thin section. CONSTITUTION:Non-effective section 35 of a flat mask 31 is hatched radially and formed into thick section 60 and thin section 61. The flat mask 31 is mounted on a plate 33 then an insulative film sheet 36 is mounted on said section 35 where an aperture 34 does not exist thereafter another flat mask 40 is mounted and finally an upper board 41 is mounted to contact three iron plates tightly. Thereafter the iron plate is warmed by a heater 44 to inject fused paraffin 46 through circumferential sections 35, 43 of two flat masks 31, 40 to permeat to each aperture section. Even if two flat masks 31, 40 are contacted tightly while holding an insulative film 36, paraffin 46 will pass through a recess 61 to reach to the aperture sections 34, 42 in short time thus to fill the space resulting in considerable improvement of workability.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention provides a method in which a plurality of masks are arranged close to each other in opposition to a screen surface, each with a predetermined spacing therebetween, and each aperture of the plurality of masks is irradiated with an electron beam. The invention relates in particular to a mask structure of a color picture tube having a pass-through structure.

[Technical background 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 uses a plurality of masks facing each other with a predetermined interval, each applying a predetermined potential difference to form an electrostatic lens for the electron beam passing through each aperture of the mask. This type of mask focusing color picture tube, which can significantly increase the utilization rate of electron beams, is disclosed in, for example, Japanese Utility Model Publication No. 45-4819, Japanese Utility Model Publication No. 47-20451, and U.S. Pat. No. 2,971,117.
and US Pat. No. 1,339,830.

Further, as another example of a color picture tube having the above structure,
As shown in Japanese Patent Publication No. 55-2698, in a color picture tube equipped with one shadow mask, two shadow masks are used to prevent mislanding caused by thermal deformation of the mask due to temperature rise of the shadow mask. There are color picture tubes with a mask arranged on them.

In the mask focusing type color picture tube and the color picture tube having two masks for preventing mislanding, the corresponding 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 shadow mask having such a structure.

However, a practical mask molding method for a mask having the above structure is disclosed in Japanese Patent Application No. 56-141740 and Japanese Patent Application No. 56-1.
93647, etc.

This is done by overlapping multiple flat masks,
This is a mask molding method in which a plurality of flat masks are simultaneously press-molded after being fixed with a filler, and then the filler that was fixing the masks is removed.

[Problems with background technology]

However, in fixation using the filling material, the filling material is injected into the apertures of each of the multiple masks stacked one on top of the other. If the thickness of the mask in the non-existing portion is uniform, it is difficult to inject the filler from the peripheral portion of the mask, resulting in poor workability.

[Purpose of the invention]

An object of the present invention is to improve workability by providing a mask structure that allows the filler to easily penetrate into the aperture of the mask when injecting the filler from the periphery of the plurality of overlapping masks. It is intended to improve.

[Summary of the invention]

The present invention makes it possible to inject the filler mainly from the thinner portions with good workability by forming the peripheral portions of the plurality of masks into thicker portions and thinner portions in the form of islands or lines. It is something.

[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 (2) via a funnel (3). ), an electron gun (5) built into the neck (4), and a deflection device (6) mounted on the outer wall from the funnel (3) to the neck (4).
), and a mask (with force and
A mask (8) having a large number of apertures (19) arranged oppositely at a predetermined distance from the mask (7) to the electron gun (5), and a neck portion (4) on the inner wall of the funnel portion (3). Conductive film (9) uniformly applied to a part (2)
It is composed of. On the screen surface, metal-backed three-color phosphors (1 row) are arranged regularly.On the inside of the side of the face plate (2) is a frame (1 row).
A pin (17) is provided to hold the frame (
The frame αe is held by fitting the elastic bodies ttS, which are welded to the ends) and ), into the bins aη. A mask (8) is welded and fixed to the frame (1), and another mask (7) is fixed to the mask (8) with adhesive.

The funnel part (3) has two buttons (Ls, (2)
+) is embedded, one button (1) is in contact with the conductive film (9), and the other button (2) is in contact with the conductive film (9).
) so that different potentials can be applied from the outside.

The mask (8) on the electron gun side is in contact with the conductive film (9) applied to the funnel part by the connector (2I) through the frame (1G), and at the same time, the mask (8) is in contact with the conductive film (9) applied to the funnel part through the frame (6) and the bottle α force. The anode 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 (20+) which is insulated from the conductive film by the connector (22), and a voltage slightly lower than the anode high voltage is applied from the outside.

In the configuration shown below, three electron beams (A) and (11) are generated from the electron gun (5), and the deflection device (
6), passes through the aperture 09 of the first mask (8), receives the lens effect, and passes through the second mask (8).
The force passes through the aperture (14) to the Nuclean surface (1) and causes the corresponding phosphor to ignite. Therefore two masks (7).

The apertures Q4) and U in (8) must correspond to each other one-to-one. A mask configured as described above can be manufactured, for example, by the following method.

As shown in Fig. 2, the first flat mask 01J having a reference hole (to) is placed on a box-shaped fixed plate (c) having a reference bottle containing 0 hot water, and the reference bottle (33) and the reference hole C30 are aligned. Then, place the insulator film sheet (3Q) on the ineffective area 09 where no aperture exists, and then place another second flat mask (4G) with the same reference hole C3CJ on the reference bin (32 Place it on the top board (
41) 3. At this time, the first flat mask Gυ
The ineffective parts (three of them are radially half-etched and are formed of a thick part (60) and a thin part (61) as shown in FIG. 3. It is an enlarged view of a part of the first flat mask Gυ in the figure.
) does not exist (43 is uniformly half-etched and becomes thin, and the insulating film sheet (to) is located in this part. Two flat masks C31), (4G and for the upper plate) are iron plates, and the fixed plate C is made of non-magnetic material, and the insulating film sheet (7
), polyimide film, etc. is suitable.1 Below the box-shaped fixed plate (to) is a heater (44J), and below that is an electromagnet (4!19), and the whole is slightly tilted. After placing two flat masks and an upper plate on the fixed plate, operate the electromagnet (4) to bring these three iron plates into close contact.After that, operate the heater (44) and place the box-shaped fixed plate (to). After heating three iron plates, including the heat, melted paraffin (46) was applied to two flat masks (31).

(The peripheral part of 40 (, (5) , (Inject from 43 and permeate into each aperture part.

The situation at this time will be explained with reference to FIG. Figure 4 is the second
FIG. The paraffin (46) poured from one direction onto the fixed plate penetrates through the small gap between the two flat masks and each aperture C44), (
Fill the space in 4a. At this time, if the present invention is not implemented, it will take a considerable amount of time for the paraffin to penetrate into the aperture because two flat masks sandwich the insulating film and are firmly attached to each other at the paraffin (Tsukuda) infiltration section. In the aperture part, the paraffin penetrates quickly because the apertures are successive.Therefore, the problem is that the penetration time from the first paraffin penetration part to the aperture part is long.When the present invention is implemented, one sheet Because there are irregularities around the flat mask (3υ), two flat masks Oυ, 00 are placed in the concave part of the insulating film (flat mask GI even if the ceramic is sandwiched and firmly attached), that is, the thinner part (61 ) remains as a large gap between the paraffin penetration part (4η) and the aperture part, so
The paraffin poured on the fixed plate (40 is in this recess (61)
) and the aperture part (reaches each aperture C34 in a short time) and fills the space of (J), so the workability is greatly improved.

In this way, paraffin (41) was injected into each aperture (C34), (43 parts), the heater 0 was turned off, the paraffin was cooled and solidified, and two flat masks 4
31).

(Fix 41 closely. After that, stop the operation of the 4 electromagnets, and fix the 2 flat masks 9υ, (4
I is taken out from the fixed plate (c) and simultaneously formed by press molding to form a shape with a surface with a constant curvature and a skirt part that supports it, and then filled and solidified into the aperture parts of two masks. The paraffin is removed by thermal dissolution or chemical dissolution (for example, washing with a trichloride solution), and then the two masks are shifted and the curved portions of the masks are set and fixed at a predetermined interval.

The specifications of the above embodiment are as follows (two types), for example.

The original thickness of the iron plate for both flat masks is 0.3 mm, the thick part of the ineffective part Gω of the first flat mask 0υ is Q, 3 mm, and the thin part is Q, l. mm, the non-effective part of the second flat mask 610 (43 is 0.2 mm, the thickness of the insulator film (column thickness is 0.1 mm).

In the above embodiments, the ineffective portion of the first flat mask is provided with radial irregularities, but the present invention is not limited to this.
For example, the effect of the present invention is the same even if irregularities are provided in the form of islands as shown in FIG.

Further, in the above embodiment, the ineffective portion of the first flat mask on the side facing the second flat mask is provided with unevenness, but the present invention is not limited to this. Roughness may be provided on the ineffective portion on the side facing the mask, or unevenness may be provided on the ineffective portion on the opposing surface side of both masks.

Furthermore, in the above embodiment, two flat masks are manufactured in close contact with each other, but two flat masks as shown in Japanese Patent Application No. 56-193647 are manufactured with a predetermined interval maintained in advance! The present invention is also applicable to such cases.

Further, in the embodiment described above, the present invention is not limited to the case of a two-mask structure (two is described, but it goes without saying that the present invention is also applicable to the case of a plurality of mask structures).

〔Effect of the invention〕

As described above (2) According to the present invention, when a plurality of masks are overlapped and a filler is injected from the mask periphery, the presence of an aperture in the mask periphery on the side of at least one mask facing the other mask. By providing unevenness in the non-effective areas, the penetration of the filling material into the apertures of the mask is significantly accelerated, and the workability can be greatly improved.

[Brief explanation of drawings]

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. 3 is a schematic diagram showing an example of a color picture tube to which the present invention is applied. FIG. 4 is an enlarged sectional view taken along x-x' of FIG. 2, and FIG. 5 is an enlarged schematic diagram showing the main parts of a mask structure according to another embodiment of the present invention. It is a diagram. 011)...First flat mask 051...Ineffective part (60)...Thick wall part (61)
...Thin part C3a...Aperture part of the first flat mask (41...Aperture part of the second flat mask (421...Agent of the aperture part of the second flat mask Patent attorney Noriyuki Chika (and 1 others) given name)

Claims (1)

[Claims] For color picture tubes, comprising a plurality of masks each having a large number of apertures, each having a certain curved surface portion and a skirt portion for holding the curved surface portion, and at least the curved surface portions of each mask are fixedly held at a predetermined interval. wherein the plate thickness of at least one portion of the opposing surface of each mask of the plurality of masks where the aperture does not exist is island-shaped or linear (having two thick portions and a thin portion). color picture tube.