JPH0373977B2 - - Google Patents

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 method of manufacturing a color picture tube mask having a structure arranged so as to pass through the mask.

[Technical background of the invention and its problems]

As a color picture tube with two masks,
A mask-focusing color picture tube significantly increases the beam utilization rate by applying a potential difference between two masks and forming an electrostatic lens on the electron beam passing through each aperture. There is a color picture tube provided with a mask for blocking unnecessary electron beams in order to reduce thermal deformation of the mask. The former is US Patent No. 2971117, Special Publication No. 1971-
22030, Japanese Utility Model Publication No. 47-20451, etc., and the latter is disclosed in Japanese Patent Publication No. 55-2698, Japanese Patent Application Laid-open No. 1973.
This is shown in Japanese Utility Model Application Publication No. 48-93769, etc. In addition, a molding method is disclosed in JP-A-57-138746 and Patent Application No. 56, in which a plurality of masks are fixed with a filler or adhesive and then press-molded at the same time, so that each aperture of the mask corresponds correctly one-to-one. -137001 and Japanese Patent Application No. 56-141740.

In the mask forming method described above, the accuracy of each aperture in the mask curved surface direction is resolved, but in order for the electron beam to efficiently pass through each aperture, the spacing between each mask must be set accurately.

[Purpose of the invention]

An object of the present invention is to accurately and easily perform the mask interval setting described above.

[Summary of the invention]

In the present invention, after the masks before the spacing is set are relatively fixed via a bonding material that has been deformed in advance in a direction opposite to the direction in which the mask spacing is widened, the deforming force in the opposite direction is released, and the bonding Relative spacing is set using the elasticity of the materials.

[Embodiments of the invention]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a case of a mask focusing type color picture tube having two masks will be described as an embodiment of the present invention with reference to the drawings.

FIG. 1 is a schematic cross-sectional view showing the positional relationship of each structure after mask spacing is set. 1 is outer mask 1
The inner mask 2 is a spherical surface including an effective part 3 with an electron beam passing aperture, and a uniform interval 4 is set between the inner mask 2 and the inner mask 2 . The skirt portion 5 of the outer mask 1 and the skirt portion 6 of the inner mask 2 are provided so that the thickness 7 of the entire skirt portion is approximately the same as the thickness of the effective portion before setting the interval, and a predetermined potential difference is provided. In contrast, an insulating material 8 is provided, and the inner mask skirt 6 is fixed to a mask frame 9 that supports the entire mask.

FIGS. 2 and 3 are explanatory diagrams before and after setting the mask interval according to the embodiment of the present invention.

The outer mask 10 and the inner mask 11 are still fixed with filler or adhesive. The mask frame 12 is provided with a reference material 13 that serves as a reference for the mask setting mechanism, and has a surface 14 perpendicular to the tube axis direction. The movable part 15 of the binding material 18 serving as a setting mechanism consists of an insulator 16 and an outer mask fixing plate 17 fixed through it.
The mask frame fixing part 19 side is made of an elastic material, and the mask frame fixing part 19 is fixed to the frame 12 so that the surface 20 in contact with the reference surface 14 is pressed against the reference surface 14 with a certain amount of force.
Here, with the mask interval setting plate 23 inserted between the reference surface 14 and the elastic material surface 20, the inner mask skirt portion 21 is fixed to the frame 12, and the outer mask skirt portion 22 is fixed to the outer mask fixing plate 17. be done. The distance between the inner mask 11 and the outer mask 10 is now fixed at zero, and even if the filler or adhesive is removed, the same positional relationship will be maintained. Next, after removing the filler or adhesive, the mask spacing setting plate 23 is removed. FIG. 3 shows this state, and the numbers correspond to those in FIG. 2. The surface 20 of the elastic material moves in the tube axis direction by the amount by which the interval setting plate 23 is removed, and the outer mask 10, which is relatively fixed, also moves in the tube axis direction accordingly. As already explained, since the inner mask 11 is fixed to the frame 12, the mask interval 24 at this time is equivalent to the thickness of the setting plate 23. The purpose can be sufficiently achieved by providing two such bonding materials on the long sides and one on the short side of a substantially rectangular mask.

In the above embodiments, the case of two masks has been described, but it goes without saying that similar settings can be made for the spacing between two or more masks using the mask frame or other masks as a reference.
Furthermore, since the present invention is characterized by utilizing the elasticity of an elastic body, various structures of the mask spacing setting machine can be considered, and the above-mentioned two-layer mask for preventing thermal deformation of the mask is also possible by insulating the two masks. Since there is no need to arrange the insulating material, it can be applied without using an insulating material.
It is not necessary to use the bonding material 18 via the bonding material 18.

〔Effect of the invention〕

As described above, according to the present invention, the mask spacing between a plurality of masks can be easily set, and the spacing can be set simply by removing the spacing setting plate, so that the entire work can be extremely easy and simplified.

On the other hand, the accuracy of mask spacing setting is very good because it depends on the thickness of the setting plate, and even if a plurality of mask spacing setting mechanisms are used, uniform setting is possible. Furthermore, a predetermined mask spacing can be easily obtained by simply changing the thickness of the spacing setting plate.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of essential parts for explaining the positional relationship of mask interval setting, and FIGS. 2 and 3 are schematic diagrams of essential parts for explaining an embodiment of the mask interval setting mechanism of the present invention. be. 1, 10... Outer mask, 2, 11... Inner mask, 3... Effective part, 4, 24... Mask interval,
5, 22... Outer mask skirt part, 6, 21...
...Inner mask skirt part, 7...Mask skirt part thickness, 8...Mask insulating material, 9, 12...Mask frame, 13...Reference material, 14...Reference surface, 1
5... Movable mechanism, 16... Insulator, 17... Outer mask fixing plate, 18... Binding material, 19... Mask frame fixing part, 20... Surface of binding material, 23...
Spacing board.

Claims (1)

[Claims] 1. A step of relatively fixing a plurality of flat masks, each having a large number of beam holes, with a filler or an adhesive, and a step of press-molding the fixed flat masks at the same time, In the method for manufacturing a color picture tube mask, the method includes at least the step of fixing a plurality of press-molded masks at predetermined intervals with respect to the mask frame as a reference, wherein the mask interval setting mechanism comprises: a reference material whose one end is fixed to the mask frame and whose other end extends in the direction opposite to the mask frame with respect to the tube axis; and an elastic material whose one end is in contact with the mask on the side that does not come into contact with the mask frame. a binding material whose other end is fixed to the mask frame; and a spacing plate inserted between the other end of the reference material and the other end of the binding material made of the elastic body. The mask on the side of the plurality of masks that comes into contact with the mask frame is fixed to the mask frame, and between the other end of the reference material and the contacting portion of the binding material made of the elastic body. fixing another mask to the one end of the binding material, removing the filler or adhesive, and removing the spacing plate. A method of manufacturing a color picture tube mask, comprising the step of pushing up the other mask in the tube axis direction until the other end of the binding material made of the elastic body comes into contact with the reference material. 2. The method of manufacturing a color picture tube mask according to claim 1, wherein the one end and the other end of the bonding material are bonded in advance via an insulator.