JPH0373978B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention comprises two masks that are closely opposed to each other with a predetermined distance from each other, and each aperture of the two 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. Furthermore, a molding method in which multiple 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 is disclosed in Japanese Patent Application Laid-Open No. 138746/1983 and Japanese Patent Application No. 1987-138. This method has been proposed in No. 56-137001 and Japanese Patent Application No. 141740/1983.

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, the relative spacing can be adjusted by inserting a spacing setting plate between the bonding material and the reference material to push up one of the masks in the tube axis direction through the bonding material and the reference material before the spacing is set. This is what you set.

[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 setting the mask interval. The outer mask 1 and the inner mask 2 have a spherical surface including an effective part 3 having an electron beam passage aperture, and are spaced uniformly apart from each other by 4.

The skirt portion 5 of the outer mask 1 and the skirt portion 6 of the inner mask 2 are set 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 for a predetermined potential difference. 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.

That is, the mask setting mechanism consists of a reference material 13, a binding material 18, a fixing plate 17, an insulating material 16, and a spacing setting plate 23, and the fixing part 19 side of the binding material 18 to the mask frame has elasticity. There is. The binding material 18 and the fixing plate 17 are embedded in advance or fixed to the insulating material 16 with an adhesive or the like. The reference material 13 and the fixing portion 19 of the bonding material 18 are positioned such that the setting surface 20 of the bonding material 18 is in contact with the reference surface 14 of the reference material 13 . After that, the reference material 13 and the bonding material 1
The fixing parts 19 of 8 are fixed to the frame 12 by resistance welding, laser welding, etc., and the setting of the setting mechanism is completed.

Next, an actual mask interval setting method will be explained. The state shown in FIG. 2 is before the mask interval is set. As mentioned above, the skirt parts 21 and 22, in which a plurality of masks are molded simultaneously, are attached to the frame 12.
The skirt portion 21 of the inner mask 11 is set to be sandwiched between the frame 12 and the fixed plate 17, and
The skirt portion 22 of the outer mask 10 is the fixing plate 17
They are each fixed by resistance welding or laser welding. In this state, the inner mask skirt part 21
The outer mask skirt portion 2 is attached to the mask frame 12.
2 are respectively fixed to the outer mask fixing plate 17. The distance between the inner mask 11 and the outer mask 10 is now fixed at zero, and the same positional relationship is maintained even after the filler or adhesive is removed.

Next, a setting plate 23 for setting the mask interval
is inserted between the reference surface 14 and the bonding material surface 20 after the filler is removed. The state is shown in FIG. 3, and the numbers correspond to those in FIG. That is, the surface 20 of the elastic material moves in the tube axis direction by the thickness of the spacing setting plate 23, 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 mask frame 12, the mask interval 24 at this time is equal to the thickness of the interval setting plate 23. After setting the predetermined mask spacing as described above, the spacing setting plate 23 is fixed to the reference surface 14 and the bonding material surface 20 by welding or the like.

In the above embodiment, an example has been described in which the bonding material 18 is fixed to the mask frame 12 by the mask frame fixing portion 19 and remains in the tube, but the bonding material 18 and the mask frame 12 may not be fixed. In this case, the reference material 13 is temporarily fixed using a jig (not shown) so that its relative position to the mask frame 12 does not move, and the distance setting plate 13 is
3 and push up the outer mask 10 by a predetermined distance in the tube axis direction, then fix the mask frame fixing part 19 of the binding material 18 and the mask frame 12, and then remove the spacing setting plate 23 and the reference material 18. good. Furthermore, the bonding material 18 does not need to be made of an elastic material, but rather preferably has a shape that is strong and difficult to deform. As in the previous embodiment, the purpose can be sufficiently achieved by providing two such bonding materials on the long side and one on the short side of the substantially rectangular mask.

In the above embodiments, the case of two masks has been described, but the spacing between two or more masks can be similarly set using a mask frame or other mask as a reference. In addition, in the case of a two-layer mask configuration to prevent thermal deformation of the mask,
Since there is no need to insulate and arrange two masks,
It is not necessary to use the bonding material 18 through the insulator 16 as in the embodiment shown in FIG.

〔Effect of the invention〕

As described above, according to the present invention, the standard for mask spacing can be easily set, and the spacing can be set simply by inserting a spacing setting plate, so that the entire operation can be made extremely easy and simplified.

On the other hand, the accuracy of mask spacing setting is very good because it only depends on the thickness of the setting plate, and uniform setting is sufficiently possible even if a plurality of mask spacing setting mechanisms are used.

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, A method for producing a color picture tube mask, which comprises at least the step of fixing the plurality of press-molded masks at predetermined intervals with respect to the mask frame using a mask interval setting mechanism,
The mask interval setting mechanism includes a reference material fixed to the mask frame and a binding material fixed to the mask frame, the reference material is fixed to the mask frame, and one end of the binding material is fixed to the mask frame. A part other than this one end is brought into contact with the reference material, the innermost mask of the plurality of masks is fixed to the mask frame, and the other mask is connected to the one end of the binding material. is fixed to another end, and the filler or adhesive is removed, and a predetermined spacing plate is inserted between the bonding material and the reference material to remove the mask fixed to the bonding material. A method for manufacturing a color picture tube mask, comprising the step of pushing up a predetermined distance in the tube axis direction. 2. The binding material is made of an elastic body in which the one end and the other end are electrically insulated and connected via an insulator, and by inserting the spacing setting plate, the binding material is connected to the pipe axis by the mask. 2. The method of manufacturing a color picture tube mask according to claim 1, wherein the spacing setting plate is fixed to both the bonding material and the reference material after being deformed so as to be pushed up in a direction. 3. A step of relatively fixing a plurality of flat masks, each having a large number of beam holes, with a filler or an adhesive, a step of simultaneously press-molding the fixed flat masks, and a step of press-molding the plurality of press-molded masks. In a method for manufacturing a color picture tube mask, the method includes at least the step of fixing two masks at a predetermined distance from each other with a mask frame as a reference using a mask interval setting mechanism,
The mask interval setting mechanism includes a reference material fixed to the mask frame and a binding material fixed to the mask frame, and temporarily fixes the reference material to the mask frame, and sets the innermost part of the plurality of masks. fixing a mask to the mask frame, fixing another mask to one end of the binding material, bringing a part other than the one end into contact with the reference material, and removing the filler or adhesive. and a step of inserting a predetermined spacing plate between the bonding material and the reference material and pushing up the mask fixed to the bonding material a predetermined distance in the tube axis direction. How to make a mask. 4. One end and the other end of the binding material are electrically insulated and coupled via an insulator, and after inserting the spacing setting plate, the other end of the binding material is fixed to the mask frame, and then 4. The method of manufacturing a mask for a color picture tube according to claim 3, wherein the distance setting plate and the reference material are removed.