摘要:
A method of manufacturing a shadow mask by making use of a coating apparatus, wherein a gravure roll 20 mm to 60 mm in diameter is disposed below a metallic thin plate and any supporting member is not disposed at an opposite side portion of the metallic thin plate to be contacted with the gravure roll. An etching resistant liquid is fed onto the gravure roll being rotated in a direction opposite to that of the metallic thin plate and at a peripheral speed of 4 to 25 times as high as that of a feeding speed of the metallic thin plate, and an excessive portion of the etching resistant liquid is wiped away by the doctor blade before the etching resistant liquid is transferred to the metallic thin plate thereby to form an etching resistant layer on the metallic thin plate.
摘要:
A color cathode ray tube is disclosed in which a coating containing an aluminum-phosphorus compound and fine particles of at least one of tungsten oxide and bismuth oxide is formed on the surface of a shadow mask on the side of an electron gun.
摘要:
An aperture pattern printing plate for manufacturing a shadow mask having an opaque layer form in parts on a surface of a transparent plate. The parts of the opaque layer corresponding to apertures in an effective area of the shadow mask. The opaque layer projecting from the transparent plate, and having a thickness of 30 to 50 .mu.m.
摘要:
A shadow mask is formed by forming two photosensitive resin layers respectively on both major surfaces of a band-like metal sheet. The first resin layer is formed by coating a resin solution on the first major surface with the first major surface directed upward, and drying the solution while maintaining the metal sheet horizontal. Likewise, the second resin layer is formed by coating a resin solution of the second major surface with the second major surface directed upward, and drying the solution while maintaining the metal sheet horizontal. Predetermined openings are made in the first and second resin layers by exposing and developing. Then, the bared portions of metal sheet are etched to form apertures therein.
摘要:
A method of manufacturing a shadow mask comprises the steps of: forming photoresist films on two major surfaces of a sheet made of a shadow mask material; forming latent images by selectively exposing the photoresist films, respectively; developing the latent images to form photoresist film patterns, respectively; and spraying an etching solution for etching the shadow mask sheet having the photoresist film patterns onto the two major surfaces thereof to etch bared portions of the shadow mask sheet, wherein the photoresist film formed on one of the two major surfaces of the shadow mask sheet is thicker than that formed on the other of the two major surfaces. The step of spraying the etching solution comprises a first step and a subsequent second step, wherein an impact of the etching solution against the shadow mask sheet in the first step is greater than that in the second step.
摘要:
A method of manufacturing an aperture pattern printing plate in a limited number of steps using only one original printing plate. The method produces transparent portions on a portion of the printing plate corresponding to a non-effective area of a shadow mask, and opaque portions on a portion of the printing plate corresponding to an effective area of a shadow mask. The method has the steps of bringing a transparent plate having an unexposed transparent photosensitive layer formed on at least one of its principal surfaces into contact with an original plate having opaque areas corresponding to apertures in a to be constructed shadow mask. A first exposure is performed on the photosensitive layer through the original plate. The photosensitive layer is then developed to render exposed portions of the photosensitive layer opaque. These opaque portions are then etched away. A portion of the photosensitive layer corresponding to the non-effective area of a shadow mask is then covered to prevent exposure. A second exposure of the photosensitive layer is then performed; thereby achieving exposure of only the portion of the photosensitive layer corresponding to an effective area of a shadow mask. The photosensitive layer is then developed to render the exposed portions of the photosensitive layer opaque. By etching away the opaque portions produced after development of the first exposure, air passages are produced on the whole surface of the transparent plate.
摘要:
Color picture tube in which a tube element, e.g., the shadow mask, is constituted by an Fe alloy to which 25-45 wt % of Ni and at least some Cr are added. A Cr rich layer is formed on the tube element surface and black oxide film with a spinel structure containing Cr is formed on the surface of this film.
摘要:
A front end element, such as a shadow mask, for a color cathode ray tube is made from an alloy including iron and nickel as its principal components; and a black oxide layer is formed integrally on the alloy base. The black oxide layer consists essentially of a spinel-type oxide with the formula Ni.sub.x Fe.sub.(3-x) O.sub.4, where x is a positive number less than 3. A front end element constructed in this way produces a higher quality picture because of reduced thermal expansion.
摘要:
A method of perforating through pores by etching in the manufacture of a shadow mask. This perforating method comprises the steps of selectively covering both surfaces of a thin metal plate with etching resistant film except a predetermined pore region; performing an etching to form recesses on the opening region of one surface of the metal plate; covering the one surface of the metal plate with an etching resistance material; etching the opening region of the other surface of the metal plate until the bottom of the etching resistance material buried in the recesses of the one surface of the metal plate is exposed; exposing both surfaces of the metal plate including the through holes by removing the etching resistant film and the etching resistant material; and etching the exposed surfaces of the metal plate again by contacting the exposed surface with an etchant.
摘要:
A method of manufacturing a shadow mask having apertures of precise shape and size, comprises the steps of forming an etching-protective film having a pattern of a number of apertures on a surface of a thin metal plate containing iron and nickel as major components, and etching the thin metal plate using an etching solution with a viscosity of 1 to 5 centipoise (cP) so as to form a number of apertures therein.