Stock material or miscellaneous articles – Sheet facing and longitudinally noncoextensive with web or...
Patent
1991-05-31
1993-10-26
Robinson, Ellis P.
Stock material or miscellaneous articles
Sheet facing and longitudinally noncoextensive with web or...
156 67, 156264, 156265, 156281, 427 64, 427 68, 427157, 428195, 428207, 428213, 428409, 428426, 428690, 428691, 428913, 445 30, 445 36, 445 37, 445 47, B32B 314
Patent
active
052564630
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a method for efficiently manufacturing a color phosphor screen, that is a luminescent screen of a color cathode-ray tube (referred to as CRT).
TECHNICAL BACKGROUND
A CRT, representatively a TV Braun tube, is designed to have an electronic gun and a phosphor screen such that the electronic gun emits an electronic beam against the phosphor screen to excite the phosphor to be luminous. Recent developments of electronics make visual equipment more various require correspondingly various kinds of CRTs, such as monochromatic, multicolored, large size and very small.
The phosphor screen, in particular, the color phosphor screen is the most important factor for the efficiency of the CRT. The color phosphor screen is composed of dot-like or stripe-like disposition of red, green and blue phosphors so as to receive an electronic beam emitted by the electronic gun.
As the manufacturing methods for the phosphor screen, there have been conventionally known a photo-curing method employing a shadow mask and a printing method.
The former photo-curing method takes the steps of flowing a slurry having a light-curing resin and a phosphor dispersed therein in a front panel of the CRT, exposing the slurry through the shadow mask, fixing predetermined color phosphors at predetermined locations, and burning fixed resin components except the phosphor. Hence, the shadow mask is essential to this photo-curing method.
The latter printing method takes the steps of directly or indirectly printing color phosphor paste on the front panel of the CRT, fixing predetermined colors at predetermined locations, and burning binder-resin components contained in the paste.
Of the foregoing methods for manufacturing the phosphor screen, the shadow mask with fine patterns being engraved is essential to the former photo-curing method. Hence, as the CRT becomes smaller in size or more high-definition, the photo-curing method requires a finer shadow mask. Hence, when manufacturing a quite high-definition screen, it is technically difficult to manufacture the shadow mask therefor. The manufacturing cost of the shadow mask becomes high in the light of the material and the productivity. Moreover, the method for manufacturing a phosphor screen based on the photo-curing method using the shadow mask has some disadvantages that it is costly in the light of the equipment making it possible to execute the method, it needs a troublesome operation for recovering a phosphor, and it suffers from a loss.
The latter printing method is more industrially advantageous in the light of the equipment cost and loss of the phosphor in comparison with the photo-curing method. However, this printing method has some difficulty in directly forming a phosphor screen on the curve of the CRT or manufacturing a small-size high-resolution color phosphor screen requiring 0.1 mm or less fine stripe pattern in the light of a proper printing. Actually, hence, this printing method is not used for manufacturing a small-sized high-resolution phosphor screen as an industrial manufacturing method.
SUMMARY OF THE INVENTION
This invention is based on the foregoing background. It is an object of the present invention to provide a method which is capable of efficiently manufacturing a fine-patterned phosphor screen for a high-resolution color phosphor screen without using a shadow mask.
A method for manufacturing a phosphor screen for a color CRT includes the steps of;
multilayering a red phosphor layer, a green phosphor layer, a blue phosphor layer, and a non-luminous layer in the sequence of a red phosphor layer, a non-luminous layer, a green phosphor layer, a non-luminous layer, a blue phosphor layer, and a non-luminous layer for forming a multilayered material,
cutting the multilayered material into thin filmy pieces toward the thickness direction,
adhering or pressing those cut pieces onto the glass panel for the front panel of a color CRT, and
burning those cut pieces.
According to an aspect of the present invention, the present manufa
REFERENCES:
patent: 2676112 (1954-04-01), Middleton
patent: 2734013 (1956-02-01), Myers
patent: 2950222 (1960-08-01), Hinson
patent: 3041228 (1962-06-01), MacLeod
patent: 4720655 (1988-01-01), Hinotani
patent: 4743801 (1988-05-01), Yokoyama
Ikegami Yukihiro
Osaka Norihisa
Ahmad Nasser
Mitsubishi Rayon Co. Ltd.
Robinson Ellis P.
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