Hitachi Maxell, Limited

Hitachi Maxwell, Ltd.

Hitachi, Ltd.

Seiichi Matsushima

Yoshio Uetani

Osamu Ishida

Masahiro Suzuki

Kenichi Yokoyama

Yasuyoshi Taniguchi

Toshinori Sugiyama

Yasunori Kanazawa

Tetsuo Mizumura

Yoshitane Tuburaya

Shinichi Abe

Mitsuru Shimizu

Nobuyuki Fujimoto

Minoru Ichijo

Ken Yoshizawa

Yoshiyuki Nakamori

Yasuyuki Mori

Sonae Kirihara

Toshio Higashihara

Mitsuyoshi Koyama

Ken-ichirou Nakao

Masahide Yagi

Disclosed is an optical data recording medium provided with a glass substrate and a recording layer carried by the glass substrate, wherein the glass substrate is composed of a glass plate having a mixed layer of metallic tin or a tin compound formed on at least one surface thereof, a content of the metallic tin or tin compound on the surface of the glass substrate being regulated to 1.3 wt % or less and the entire surface of the glass plate being subject to a chemically reinforcing treatment, and also disclosed is a method of manufacturing an optical data recording medium provided with a glass substrate and a recording layer carried by the glass substrate, which comprises the steps of making a glass plate by a float method using melted metallic tin for the glass substrate, cutting the glass plate to a desired configuration and size, polishing at least one surface of the glass plate which is in contact with the melted metallic tin when making the glass plate to regulate a content of tin in the polished surface to 1.3 wt % or less, and subjecting the polished glass plate to a chemically reinforcing treatment.

Optical data recording medium and method of manufacturing the same

There is disclosed an optical information recording medium comprising forming at least a recording or reflecting film on one surface of a substrate, wherein an plasma-polymerized film of a halogen-containing resin is formed on at least one of the surface of the substrate or the outer surface of the recording or reflecting film. The medium may further include an additional UV-curing film which is formed on any of the surface of the substrate or plasma-polymerized film of halogen-containing resin on the surface of the substrate, the recording or reflecting film, or the peripheries of the substrate and protective film.

Optical information recording medium and its production

A disc cartridge comprising a cartridge case, a magnetic recording disc rotatably mounted in the cartridge case, and head insertion openings formed extending to the side portions of the cartridge case, the openings being opened even at one edge of the cartridge case for facilitating insertion of the head mounted in a recording and play back device, the cartridge case being reinforced by at least one reinforcement member having a smaller diameter or a smaller thickness than the thickness of the cartridge case.

Disc cartridge

An optical recording disc comprises a first bonding recess formed near an outside surface of an optical recording disc in a bonding boundary portion between a cylindrical hub and a transparent disc substrate, a disc member bonded with said transparent disc substrate through said cylindrical hub, and a second bonding recess formed near the outside surface of said optical recording disc in a bonding boundary portion between said cylindrical hub and said disc member. Accordingly, said optical recording disc can prevent remainder of a bonding material for bonding a pair of said transparent disc substrates or said transparent disc substrate and said disc member together from pushing out of the outside surface of the optical recording disc, resulting in that focusing for reading and writing an information signal can be properly performed.

Optical recording disc

A cell comprising a positive can and a negative collector fitted in the opening of the positive can, a gasket being set in the space between the positive can and the negative collector to prevent the leakage of liquid material from the cell, characterized in that the gasket is made of a synthetic resin composition comprising glass beads. The cell is much improved in its leak-proof properties.

Cell with gasket comprising glass beads

A leak-proof cell comprising a positive can and a negative collector fitted in the opening of the positive can, a gasket made of a synthetic resin being set in the space between the positive can and the negative collector to prevent the leakage of any liquid material in the cell, characterized in that the degree of crystallinity of the gasket set in the cell is at least 10% higher than that of the gasket immediately after molding.

Leak proof cells provided with a synthetic resin gasket having an

A leak-proof alkaline cell comprising a positive can, a negative cap having a turned-up portion, said cap being fitted at the open end of the positive can and a gasket provided between the positive can and the negative cap, the rim of the positive can being crimped inwardly so as to press the gasket to the negative cap, the negative cap being made of a metal plate laminated with a copper layer which is adapted to be contacted with a negative electrode active material mix and the copper layer also extending to the outer surface of the negative cap facing the gasket, characterized in that the copper layer is eliminated at the ultimate terminal edge of the turned-up portion.

Leak-proof alkaline cell and its production

A leak-proof alkaline cell comprising a positive can and a negative electrode collector kept at the opening end of the positive can with intervention of a gasket so as to make the inside of the cell liquid-tight, characterized in that the gasket is made of an alkali resistant, elastic material and has a moisture content of not more than 0.3% by weight.

Leak-proof alkaline cell and its manufacture

A leak-proof alkaline cell comprising a negative electrode collector and a gasket, characterized in that the negative electrode collector is coated with a film comprising a triazole compound at least at the part faced to the gasket.

Growing community of inventors

Toyonaka, Japan

Seiichi Matsushima