Hitachi, Ltd.

Other

Yoshiyuki Odaka

Masahiro Nishizawa

Kiyoshi Miura

Nobuaki Hayashi

Toshimasa Ishigaki

Yoshifumi Tomita

Saburo Nonogaki

Hiroshi Yoshioka

Akira Misumi

Michiaki Hashimoto

Hiromitsu Kawamura

Toshio Tojo

Hajime Morishita

Motoo Akagi

Katsumi Kobara

Osamu Sasaya

Masayoshi Ezawa

Takehiko Ueyama

Masato Ito

Hiromi Matsuda

Kouichi Nakazato

A color cathode ray tube of the present invention includes an evacuated envelop that is structured from a panel having a phosphor screen on its inner surface, a neck portion containing therein an electron gun assembly, and a cone-shaped section called the funnel for integrally coupling the panel and the neck together, wherein when the main scanning direction of a display screen formed of the panel is defined as an X direction whereas a direction at right angles to the main scan direction is as a Y-direction, an equivalent radius of curvature R of an outer surface of the panel in the X direction is at least 2.6 times greater than an equivalent curvature radius R of the inner surface while forming on the inner panel surface an inside light absorption layer that is comprised of pigments as its principal component.

Flat face type color cathode ray tube having panel with curved inner surface

A color cathode-ray tube providing a nonglare effect which can be regenerated without degradation of its nonglare function and which can be inexpensively formed. A light scattering film composed of metal containing compound micro-particles having a high index of refraction and a particle size of 0.1 &mgr;m to 2 &mgr;m is formed in contact with the internal surface of a faceplate of the color cathode-ray tube, and a black matrix having a multiplicity of holes is formed on the light scattering film. A red phosphor layer, a green phosphor layer and a blue phosphor-layer are formed in the holes of the black matrix on the light scattering film in such a manner that the phosphor layers of red, green and blue are disposed cyclically in that order. External light incident on the faceplate is partly reflected by the external surface of the faceplate, and the remainder of the external light passes through the faceplate and is made incident on the light scattering film. The external light is scattered by the metal containing compound micro-particles having a high index of refraction, so that no substantial light components of the external light again penetrate into the face plate thereby providing a nonglare effect.

Color cathode-ray tube having nonglare means on internal surface of faceplate

This invention relates to a process for forming a pattern using a photosensitive composition comprising a polymeric azide and a high-molecular weight copolymer or polymer. The photosensitive composition comprises a copolymer containing at least a water-soluble non-photosensitive monomeric unit having an electrolytic functional group, a monomeric unit having an azido group and an electrolytic functional group and a high-soluble high molecular weight copolymer or polymer which exhibits reciprocity law failure characteristic.

Process for forming a pattern using a photosensitive azide and a

The panel face plate of a cathode ray tube is provided with an irregular film which is formed by spraying a mixed solution of silicon hydroxide, alcohol and alkyl acetate onto the panel face plate.

Technique for preventing reflections in a cathode ray tube

Disclosed herein is a method of producing a phosphor screen of color picture tube wherein a light absorbing material is applied onto the inner surface of a panel, a shadow mask is provided, the surface of film of the light absorbing material is scanned and irradiated with a laser beam via the shadow mask so that portions of the light absorbing material irradiated with the laser beam are heated and burned, thereby to form a black matrix. According to this method, the number of steps for forming the black matrix is decreased, and the quality and yield of the phosphor screen are increased.

Method of producing phosphor screen of color picture tube

A method of manufacturing a cathode-ray tube is provided, wherein in forming a phosphor screen on the inner surface of a faceplate of the cathode-ray tube, the inner surface of the faceplate faces downward while the faceplate is rotated about the axis of the cathode-ray tube, and a liquid material for forming a film is sprayed from a supply nozzle arranged to be substantially perpendicular to the inner surface of the faceplate so as to spray the liquid material on the inner surface of the faceplate along all directions, thereby forming a uniform film throughout the inner surface of the faceplate.

Method of manufacturing cathode-ray tube

In forming a fluorescent screen of a black matrix type color picture tube, a light absorptive film is first formed on the inner surface of a face plate of the color picture tube. Formed on the light absorptive film is a light-hardenable photosensitive resin film which in turn is exposed to light through a shadow mask at portions corresponding to phosphor applying portions. The unexposed portion of the light-hardenable photosensitive film is then developed. Finally, the exposed portion of the light-hardenable photosensitive film and portion of the light absorptive film therebeneath are removed to partly perforate the light absorptive film so that in the light absorptive film, openings are formed into which the phosphor is applied.

Method of forming a fluorescent screen of a black matrix type color

Disclosed are a photosensitive composition comprising a copolymer comprising acrylamide, diacetone-acrylamide and a sulfonated vinyl monomer, such as sodium p-styrenesulfonate, and a water-soluble aromatic bisazide compound, and a pattern-forming method using this photosensitive composition. This photosensitive composition has a reciprocity law failure, and when this photosensitive composition is used, the development after light exposure is completed in a short time.

Photosensitive bis-azide composition with acrylic terpolymer and

A light exposing prism system for use in light exposure process for forming a phosphor plane of a color picture tube is disclosed. The prism system is arranged between a panel of the color picture tube and a linear exposing light source and includes a plurality of small prisms which are arranged transversely to an axial line extending through a center of the panel and a center of the light source and to a longitudinal axis of the light source. The prism system is adapted to be oscillated in the direction of arrangement of the small prisms. Pitch of the arrangement of the small prisms is within a range of 0.05 mm to 3.0 mm, preferably 1.0 mm to 3.0 mm.

Growing community of inventors

Isumi, Japan

Yoshiyuki Odaka