Abstract: A slot tension-type shadow mask for the cathode-ray tube (CRT) has slots. Each slot has two openings and a pseudo-bridge between the two opening of the slot. The slots are formed in the X-Y plane that is formed away from the electron gun in the Z-axis. Each pseudo bridge has a pair of protuberances separated by a lacuna. The edges of each protuberance is etched to have various surface profiles in the X, Y, Z directions and/or the shape of the lacuna is also varied to provide effective shielding while overcoming various problems associated with heating and image imperfections appearing on the CRT screen.

Abstract: The present invention provides a shadow mask having an improved resistance to an impact such as vibration or dropping so as to keep a constant quality of a color cathode-ray tube.

Abstract: The invention relates to a magnetostriction control alloy sheet advantageously used as a high resolution shadow mask having a low coefficient of thermal expansion, superior magnetic properties and a high Young's modulus after a blackening process, a manufacturing process for the same, and a part for a color Braun tube such as a shadow mask. The magnetostriction control alloy sheet comprises C at 0.01 wt. % or less, Ni at 30 to 36 wt. %, Co at 1 to 5.0 wt. %, and Cr at 0.1 to 2 wt. %, the remainder Fe and unavoidable impurities, and having a magnetostriction &lgr; after the softening and annealing of (−15×10−6) to (25×10−6).

Abstract: A shadow mask is formed from a plate member comprising an outer frame portion, a body portion of a shadow mask having an outer peripheral line formed through an etching process and a plurality of connection portions through which the body portion of the shadow mask is supported by the outer frame portion. The shadow mask is formed from the plate member by removing the outer frame portion from the body portion of the shadow mask. In this process, a break portion is formed to the shadow mask by removing the outer frame portion so as to be recessed inward from the outer peripheral line of the shadow mask.

Abstract: A slot tension-type shadow mask for the cathode-ray tube, slots of which are provided with a pseudo-bridge, and the pseudo-bridge is provided with the deviation in the Y-axis direction, is disclosed. The deviation in the Y-axis direction means the condition that, in the relation between the width of the etching part at the mask outer peripheral edge part side (outside etching part) in the Y-axis direction and the width of the etching part at the mask center part side (inside etching part) in Y-axis direction on the surface facing to a screen (being opposite in direction to an electron gun) , the inside etching part is longer than the outside etching part. The outside etching part means a part between an endmost point a of the protuberance at the mask outer peripheral side in the Y-axis direction and a surface edge point b of the protuberance at the outer peripheral side in the Y-axis direction on the surface facing to the screen.

Abstract: A process of forming a high-definition pattern by etching is provided. A photosensitive resin layer is formed on a metal substrate material having a center line-average surface roughness Ra of up to 0.10 &mgr;m and a maximum surface roughness Rmax of up to 1.0 &mgr;m to form a resist pattern. Then, the photosensitive resin layer provided on the metal substrate material is exposed to light to form a resist pattern. Finally, etching is carried out to form a pattern on the metal substrate material.

Abstract: A shadow mask comprises a frame member, a mask body formed in a plate shape as a grid element and mounted to the frame member and a plurality of slits formed to the mask body. The mask body is composed of an iron-based alloy containing 31.0-38.0 weight % of nickel and 1.0-6.5 weight % of cobalt and the iron-based alloy contains 0.01-0.10 weight % of carbon.

Abstract: A process of forming a high-definition pattern by etching is provided. A photosensitive resin layer is formed on a metal substrate material having a center line-average surface roughness Ra of up to 0.10 &mgr;m and a maximum surface roughness Rmax of up to 1.0 &mgr;m to form a resist pattern. Then, the photosensitive resin layer provided on the metal substrate material is exposed to light to form a resist pattern. Finally, etching is carried out to form a pattern on the metal substrate material.

Abstract: A shadow mask for a Braun tube is composed of an iron-based alloy plate of a low thermal expansion structure containing nickel and cobalt, and the iron-based alloy plate has a crystal grain size of more than 6.0 and less than 9.0 measured by a grain size measuring method prescribed in JIS (Japanese Industrial Standard) G0551, and 0.2% proof stress of more than 240N/mm2 and less than 320N/mm2.

Abstract: A stretched mask having a high tensile strength and favorable high-temperature creep properties and free from tape twist, and a material for the stretched mask. A low-carbon steel sheet containing 70 ppm to 170 ppm of nitrogen on a weight basis is heat-treated at a temperature at which recrystallization does not take place. The heat-treated material is provided with a resist pattern for forming apertures and subjected to etching to form apertures.

Abstract: A stretched mask for a color picture tube and a material for the stretched mask. The stretched mask is formed from a nickel-iron alloy steel sheet made of a nickel-iron alloy containing 35.0% to 37.0% by weight of nickel and 0.01% to 0.06% by weight of carbon. The nickel-iron alloy steel sheet is provided with apertures by etching using a pattern provided on the sheet. The stretched mask is free from image degradation due to a rise in temperature.

Abstract: A shadow mask for a color picture tube that is made of an iron-base alloy material containing nickel and has a low coefficient of thermal expansion. The iron-base alloy material has 0.2% proof stress of from 220 to 300 N/mm2. The grain size number measured in conformity to JIS G0551 is not more than 7.5. The degree of texture in each plane measured by X-ray diffraction method is not more than 20%. The difference between the degree of texture in each plane and that in any other plane is not more than 20%. The shadow mask is produced by press forming without undergoing annealing before the press forming.

Abstract: A shadow mask for a color picture tube that is made of an iron-base alloy material containing nickel and has a low coefficient of thermal expansion. The iron-base alloy material has 0.2% proof stress of from 220 to 300 N/mm2. The grain size number measured in conformity to JIS G0551 is not more than 7.5. The degree of texture in each plane measured by X-ray diffraction method is not more than 20%. The difference between the degree of texture in each plane and that in any other plane is not more than 20%. The shadow mask is produced by press forming without undergoing annealing before the press forming.

Abstract: A shadow mask is formed with through holes in a predetermined arrangement or pattern. Each of the through holes has a rear surface side hole portion through which an electron beam enters and a front surface side hole portion through which the electron beam outgoes so as to form a beam spot having a predetermined shape on a surface to be irradiated. The front surface side hole portion of the through hole formed at a peripheral portion of the shadow mask has an opening hole area smaller than that of the front surface side hole portion of the through hole formed at a central portion thereof. The front surface side hole portion of the through hole formed at a peripheral portion of the shadow mask may have substantially an elliptical shape having an opening hole width in a direction normal to a virtual line extending from a center of the shadow mask, and the width is made smaller than that of the front surface side hole portion of the through hole formed at a central portion thereof.

Abstract: The present invention provides a shadow mask having an improved resistance to an impact such as vibration or dropping so as to keep a constant quality of a color cathode-ray tube.

Abstract: The invention relates to a magnetostriction control alloy sheet advantageously used as a high resolution shadow mask having a low coefficient of thermal expansion, superior magnetic properties and a high Young's modulus after a blackening process, a manufacturing process for the same, and a part for a color Braun tube such as a shadow mask. The magnetostriction control alloy sheet comprises C at 0.01 wt. % or less, Ni at 30 to 36 wt. %, Co at 1 to 5.0 wt. %, and Cr at 0.1 to 2 wt. %, the remainder Fe and unavoidable impurities, and having a magnetostriction&lgr; after the softening and annealing of (−15×10−6) to (25×10−6).

Abstract: A stretched mask having a high tensile strength and favorable high-temperature creep properties and free from tape twist, and a material for the stretched mask. A low-carbon steel sheet containing 70 ppm to 170 ppm of nitrogen on a weight basis is heat-treated at a temperature at which recrystallization does not take place. The heat-treated material is provided with a resist pattern for forming apertures and subjected to etching to form apertures.

Abstract: A stretched mask having a high tensile strength and favorable high-temperature creep properties and free from tape twist, and a material for the stretched mask. A low-carbon steel sheet containing 70 ppm to 170 ppm of nitrogen on a weight basis is heat-treated at a temperature at which recrystallization does not take place. The heat-treated material is provided with a resist pattern for forming apertures and subjected to etching to form apertures.

Abstract: An aperture grill for a cathode ray tube is formed with parallel slits by etching a cold-rolled low-carbon steel plate from the opposite sides thereof. Before carrying out the etching, the steel plate is subjected to an annealing step whereby the residual stress is reduced to 7.0 Kg/mm.sup.2 or less. The steel plate is also subjected to a tensile force for imparting a tension in the direction of the rolling of a hoop steel from which the steel plate is produced. Furthermore, the steel plate is so oriented that the direction of tapes of the aperture grill to be produced will coincide with the rolling direction. The above process makes it possible to prevent occurrence of "streaks" and improves the quality of images generated on the cathode ray tube.

Abstract: A method of producing an aperture grill of a CRT display device is disclosed. The aperture grill is of a small thickness of the order of 20 to 100 .mu.m. To a metal plate with front and rear surface resin layers are applied front slit pattern mask with a single broad slit pattern and a rear slit pattern mask with two adjacent, narrow slit patterns. With these two masks disposed in opposition, the slit patterns are printed and developed on the resist layers. Thereafter, etching is carried out on the rear surface of the metal plate via the rear resist layer, and rear cavities are formed in the metal plate. Then, a reinforcing, etchant-proof film is attached to the rear resist layer to cover the rear cavities, and thereafter etching is carried out on the front surface of the metal plate via the front resist layer, to thereby form a front cavity.