Title:
OPTICAL DISK DEVICE
Document Type and Number:
Japanese Patent JP2002358674
Kind Code:
A
Abstract:
To stabilize the variation in laser power due to the shift of a condenser lens.
The device is provided with a light source, a condenser lens which converges a beam emitted from the light source on an optical disk, a tracking control means which makes a converged light spot follow the track or a guide groove of the optical disk, a beam adjusting means which adjusts the quantity of the beam emitted from the light source, and a pair of photodetecting means symmetrically provided with respect to the following guide groove at the peripheral part of the condenser lens, and the quantity of the emitted beam is adjusted according to a differential output of the pair of the photodetecting means.
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Inventors:
YAMAZAKI MASAHIRO
FUJII NORIAKI
KAGAWA TOSHIO
FUJII NORIAKI
KAGAWA TOSHIO
Application Number:
JP2001165108A
Publication Date:
December 13, 2002
Filing Date:
May 31, 2001
Export Citation:
Assignee:
SHARP KK
International Classes:
G11B7/09; G11B7/125; (IPC1-7): G11B7/09; G11B7/125
Attorney, Agent or Firm:
Hideo Fujiwara
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