Title:
光記録媒体
Document Type and Number:
Japanese Patent JP4437727
Kind Code:
B2
Abstract:
An optical recording medium contains a recording layer being composed of a phase-change recording material where at least four elements, Ga, Sb, Sn and Ge are contained and the transfer linear velocity is 20 m/s to 30 m/s , and when the wavelength of a recording/reproducing light is within the range of 650 nm to 665 nm and the recording linear velocity is 20 m/s to 28 m/s, the refractive index Ncand the extinction coefficient Kc in a crystalline state and the refractive index Na and the extinction coefficient Ka in an amorphous state in the recording layer respectively satisfy the following numerical expressions: 2.0 = Nc = 3.0, 4.0 = Kc = 5.0, 4.0 = Na = 5.0, and 2.5 = Ka = 3.1, and information is recordable at the range of 20 m/s to 28 m/s of recording linear velocity.
Inventors:
Sekiguchi Hiroyoshi
Kazunori Ito
Koji Deguchi
Hiroko Tashiro
Masaki Kato
Mikiko Abe
Kazunori Ito
Koji Deguchi
Hiroko Tashiro
Masaki Kato
Mikiko Abe
Application Number:
JP2004261830A
Publication Date:
March 24, 2010
Filing Date:
September 09, 2004
Export Citation:
Assignee:
株式会社リコー
International Classes:
B41M5/26; G11B7/24; G11B7/24035; G11B7/24062; G11B7/24079; G11B7/24082; G11B7/243; G11B7/2433
Domestic Patent References:
| JP2003291534A | ||||
| JP2004174868A |
Attorney, Agent or Firm:
Eiji Tomomatsu