Title:
ディスク再生装置
Document Type and Number:
Japanese Patent JP4067781
Kind Code:
B2
Abstract:
The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.
Inventors:
Kazuhiko Ono
Hirotoshi Fukuda
Takeshi Ikeda
Hirotoshi Fukuda
Takeshi Ikeda
Application Number:
JP2001114767A
Publication Date:
March 26, 2008
Filing Date:
April 13, 2001
Export Citation:
Assignee:
Hitachi LG Data Storage Co., Ltd.
International Classes:
G11B7/004; G11B19/12; G11B5/09; G11B7/00; G11B7/005; G11B7/085; G11B7/09
Domestic Patent References:
| JP11306650A | ||||
| JP2000293932A | ||||
| JP2000315355A | ||||
| JP2001184676A |
Foreign References:
| WO1999040583A1 |
Attorney, Agent or Firm:
Polaire Patent Business Corporation