Matsushita Electric Industrial Co., Ltd.

Panasonic Intellectual Property Management Co., Ltd.

Panasonic Corporation

Matsushita Electrical Industrial Co., Ltd.

Hidemi Isomura

Eiji Ohno

Tetsuya Akiyama

Kazuya Hisada

Takeo Ohta

Akihiro Moteki

Mamoru Shoji

Kazuo Inoue

Kazuhiro Hayashi

Kazumi Yoshioka

Shuji Tabuchi

Hideo Matsumoto

Yoshihiro Kawasaki

Shigeaki Furukawa

Norihisa Mino

Hiroyuki Ohta

An information recording medium of the present exemplified embodiment is configured by laminating a substrate having a predetermined thickness and a substrate having a predetermined thickness to each other. A film forming region including a recording region, a clamp region and a rib are formed on one surface of the information recording medium. A film forming region including a recording region, a clamp region and a rib are formed on the other surface of the information recording medium. On both surfaces, the components are formed in the order of the rib, the clamp region and the film forming region toward an outer peripheral side from an inner peripheral side.

Disk-shaped information recording medium, disk cartridge and information recording and reproducing apparatus

The disk-shaped information recording medium having an outer diameter and an inner diameter comprises a substrate having a predetermined thickness, a first side that is one side of the substrate, a second side that is the other side of the substrate, a cylindrical portion forming a through hole formed at a center of the substrate, and a thin portion formed so as to surround an outer diameter of the cylindrical portion. The thin portion is thinner than the predetermined thickness and includes a non-inclined surface and an inclined surface formed on an outer diameter side of the non-inclined surface. The inclined surface is inclined at an angle greater than or equal to 25 degrees and less than or equal to 35 degrees with respect to the non-inclined surface.

Disk-shaped information recording medium, disk cartridge, and information recording/reproducing apparatus

The disk-shaped information recording medium having an outer diameter and an inner diameter comprises a substrate having a predetermined thickness, a first side that is one side of the substrate, a second side that is the other side of the substrate, a cylindrical portion forming a through hole formed at a center of the substrate, and a thin portion formed so as to surround an outer diameter of the cylindrical portion. The thin portion is thinner than the predetermined thickness and includes a non-inclined surface and an inclined surface formed on an outer diameter side of the non-inclined surface. The inclined surface is inclined at a predetermined angle to the non-inclined surface and is larger than the non-inclined surface in the thin portion.

An optical information recording medium is manufactured by bonding a first substrate having a first central bore and a second substrate having a second central bore to each other with radiation cure resin. The radiation cure resin is coated on the first substrate. The first and second substrates are brought into close contact with each other so as to form the first and second substrates integrally with the radiation cure resin. A neighborhood of the first and second central bores is radiated. A whole of at least one of opposite outer faces of the integral first and second substrates is irradiated with radiation so as to wholly cure the radiation cure resin.

Optical information recording medium and its manufacturing method and apparatus

An optical information recording medium includes a reflective film, a recording film and a protective film on a substrate. The protective film is provided with a surface layer on a side opposite to the substrate. On an outer layer of at least one selected from the substrate and the protective film, a hard coat resin layer is formed. On an outer layer of the hard coat resin layer, a chemisorptive film including organic silane molecules represented by the general formula R SiR&prime; Z &mdash;(wherein R is a group including a carbon chain with a carbon number of 3 to 25, Z is O, N or S, n is 1, 2 or 3, R&prime; is hydrogen or an alkyl group with a carbon number of 1 to 3, and m is 0, 1 or 2) is formed by covalent bonding with the hard coat layer.

Optical information recording medium and method for manufacturing the same

An optical information recording medium includes a first substrate; at least a first dielectric layer and a recording layer for signal recording provided on a surface of the first substrate; and a second substrate. The first substrate and the second substrate are assembled together in the state of being warped in planar symmetry and flattened. The first dielectric layer and the recording layer is interposed between the first substrate and the second substrate.

Optical information recording medium and method for producing the same

A method for manufacturing an optical information recording medium which is usually stable and is not affected by the environmental condition and an apparatus used therefor. The method comprises the steps of placing a substrate and a member comprising a material for a film opposing each other in a vacuum film forming chamber; forming a plasma by glow discharging a gas between the substrate and the member comprising a material for a film; and supplying a gas mixture containing water to the film forming chamber before forming films or during forming films of the protective layer by the film forming method in which the material for a film freed from the member comprising a material for a film by using the plasma as an energy source are attached or deposited on the substrate.

Method for manufacturing an optical information recording medium

On one surface of a disk substrate, a first dielectric layer, a thin recording layer, a second dielectric layer and a reflecting layer are cumulatively formed. The second dielectric layer is thinner than the first dielectric layer and is 35-70 nm thick. The reflecting layer is 70-120 nm thick. The total thickness of the four layers is 250-430 nm. The compressive stress of the layers is offset by tensile stress generated by an overcoat resin protective layer, formed on the reflecting layer. A method of using the optical recording medium applies the MCAV (Modified Constant Angular Velocity) recording method which records information by changing recording frequencies in accordance with linear velocity. The linear velocity is 5-12 m/s. A ratio of an inner circumference recording pulse width to an outer circumference recording pulse width is 1.2 or more.

Method of recording information

On one surface of a disk substrate, a first dielectric layer, a thin recording layer, a second dielectric layer and a reflecting layer are cumulatively formed. The second dielectric layer is thinner than the first dielectric layer and is 35-70 nm thick. The reflecting layer is 70-120 nm thick. The total thickness of the four layers is 250-430 nm. The compressire stress of the layers is offset by tensile stress generated by an overcoat resin protective layer, formed on the reflecting layer. A method of using the optical recording medium applies the MCAV (Modified Constant Angular Velocity) recording method which records information by changing recording frequencies in accordance with linear velocity. The linear velocity is 5-12 m/s. A ratio of an inner circumference recording pulse width to an outer circumference recording pulse width is 1.2 or more.

Optical recording medium

A phase change type information storage disk in which a reflective layer is formed of an alloy thin film comprising as a main component any one of Ni--Cr, Cr or Ti and a metal having a larger malleability than said main component, being easy to be initialized and strong to thermal shock.

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Okayama, Japan

Hidemi Isomura