Title:
OPTICAL DISC DEVICE AND OPTICAL DISC DISCRIMINATING METHOD
Document Type and Number:
WIPO Patent Application WO/2007/099740
Kind Code:
A1
Abstract:
An objective lens is shifted, while irradiating a disc with laser beams, the maximum value (FEmax) and the minimum value (FEmin) of a focus error signal and the maximum value (FSmax) of the amplitude of a focus sum signal are measured, and the type of the disc is discriminated by comparing the value "(FEmax-FEmin)/FSmax" with a discriminating value.
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Inventors:
HOSOKAWA KOUJI
IKEDA KEI
ASHIHO KOHEI
IKEDA KEI
ASHIHO KOHEI
Application Number:
PCT/JP2007/051978
Publication Date:
September 07, 2007
Filing Date:
February 06, 2007
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
HOSOKAWA KOUJI
IKEDA KEI
ASHIHO KOHEI
HOSOKAWA KOUJI
IKEDA KEI
ASHIHO KOHEI
International Classes:
G11B7/004; G11B7/085; G11B7/09; G11B19/12
Domestic Patent References:
WO2004088656A1 | 2004-10-14 | |||
WO2003063149A1 | 2003-07-31 |
Attorney, Agent or Firm:
ITAGAKI, Takao (10-10 Nishi-Hommachi 1-chom, Nishi-ku Osaka-shi Osaka 05, JP)
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