Title:
OPTICAL INFORMATION DEVICE AND METHOD OF CONTROLLING GAP THEREOF
Document Type and Number:
WIPO Patent Application WO/2012/127831
Kind Code:
A1
Abstract:
An optical disc device according to the present invention is provided with a laser (14) for emitting light, an optical system including a SIL (2) for forming a given sized beam spot on an optical disc (1) by using light from the laser, a detector (26) for generating a laser power detection signal by detecting the emission power of the laser, a laser power control circuit (27) for controlling the emission power of the laser by using the laser power detection signal, a detector (10) for generating a gap detection signal by detecting the gap length between the optical disc and the SIL, and a gap control circuit (15) for controlling the gap length between the optical disc and the SIL by using the gap detection signal, wherein the power control circuit has a gain crossover larger than the gain crossover of the gap control circuit.
Inventors:
FUTAKUCHI RYUTARO
FURUMIYA SHIGERU
FURUMIYA SHIGERU
Application Number:
PCT/JP2012/001844
Publication Date:
September 27, 2012
Filing Date:
March 16, 2012
Export Citation:
Assignee:
PANASONIC CORP (JP)
FUTAKUCHI RYUTARO
FURUMIYA SHIGERU
FUTAKUCHI RYUTARO
FURUMIYA SHIGERU
International Classes:
G11B7/1263; G11B7/09; G11B7/1267
Foreign References:
| JP2002319160A | 2002-10-31 | |||
| JPH06236576A | 1994-08-23 | |||
| JP2002319156A | 2002-10-31 | |||
| JP2002319153A | 2002-10-31 | |||
| JP2004335064A | 2004-11-25 |
Attorney, Agent or Firm:
KOTANI, Etsuji et al. (JP)
Etsuji Kotani (JP)
Etsuji Kotani (JP)
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Claims: