Title:
OPTICAL DISK SUBSTRATE
Document Type and Number:
Japanese Patent JP2003020332
Kind Code:
A
Abstract:
To provide an optical disk substrate which comprises an aromatic polycarbonate resin and is a high-precision recording medium with a high transfer ratio.
This optical disk substrate is prepared by molding an aromatic polycarbonate resin prepared by using 2,2-bis(4-hydroxyphenyl)-4-methylpentane as the dihydric phenol component. The distance between groove lines or pit lines formed on the substrate is 0.17 μm-0.8 μm and is in the range of λ/8n-λ/2n (wherein λ is the wavelength of laser light used for recording and reproduction; and n is the refractive index of the substrate).
Inventors:
NISHIDA SHINTARO
ANDO MASATO
HAYASHI KUNIKORE
FUJIMARU SHIGEKI
ANDO MASATO
HAYASHI KUNIKORE
FUJIMARU SHIGEKI
Application Number:
JP2001204375A
Publication Date:
January 24, 2003
Filing Date:
July 05, 2001
Export Citation:
Assignee:
TEIJIN CHEMICALS LTD
International Classes:
C08G64/06; G11B7/2405; G11B7/24079; G11B7/24085; G11B7/2534; G11B7/26; (IPC1-7): C08G64/06; G11B7/24; G11B7/26
Domestic Patent References:
| JPH11166113A | 1999-06-22 | |||
| JPH11269260A | 1999-10-05 |
Foreign References:
| WO1997022649A1 | 1997-06-26 |
Attorney, Agent or Firm:
Masataka Oshima
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