Information recording medium and method for manufacturing information recording medium
AssigneePanasonic Intellectual Property Management Co., Ltd.
InventorsAkio Tsuchino, Rie Kojima
Life of this patent
Estimating the term…
Abstract
An information recording medium according to the present disclosure is an information recording medium of a write-once-read-many type and records or reproduces information when irradiated with laser light. The information recording medium includes: a substrate; a plurality of information layers at least one information layer of which includes a recording film that is a W—O-based recording film comprising at least tungsten (W) and oxygen (O); and a dielectric film A in contact with the W—O-based recording film, the dielectric film A comprising at least 30 mol % tin oxide.
Claims10
An information recording medium which is of a write-once-read-many type and records or reproduces information when irradiated with laser light, the information recording medium comprising:
- a substrate;
- a plurality of information layers at least one information layer of which includes a recording film that is a W—O-based recording film comprising at least tungsten (W) and oxygen (O);
- and
- a dielectric film A in contact with the W—O-based recording film, the dielectric film A comprising at least 30 mol % tin oxide,
- wherein the at least one information layer includes the dielectric film A, the W—O-based recording film, and an In2O3—SnO2 dielectric film in stated order from a side closer to a surface of the information recording medium irradiated with the laser light, the In2O3—SnO2 dielectric film comprising less than 30 mol % SnO2.
A method for manufacturing an information recording medium, the method comprising
- two or more steps of forming an information layer, wherein
- at least one of the two or more steps of forming the information layer includes:
- (i) forming a W—O-based recording film comprising tungsten (W) and oxygen (O);
- and
- (ii) forming a dielectric film A comprising at least 30 mol % tin oxide,
- the forming of the W—O-based recording film (i) includes sputtering, using a target comprising W and O, and
- the forming of the dielectric film A (ii) includes sputtering, using a target comprising Sn and O.
Dependencies are inferred from the claim text.