Optical disk apparatus

Details Optical disk apparatus Optical disk apparatus

2006-03-20

2010-11-09

Young, Wayne R (Department: 2627)

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Control of information signal processing channel

C369S047170, C369S053170, C369S053230, C369S053280

Reexamination Certificate

active

07830761

ABSTRACT:
An optical disk apparatus according to the present invention includes: a rotation driving section on which an optical disk is to be mounted and which drives the optical disk so as to be rotated; a light source; an objective lens for converging light from the light source onto an optical disk mounted on the rotation driving section; a photodetector having at least two detection sections for detecting reflected light, from the optical disk, of the light; and an error signal generation section for deriving a difference signal and a sum signal of respective outputs from the two detection sections of the photodetector, adjusting an offset in at least the sum signal among the difference signal and the sum signal, and thereafter dividing the difference signal by the sum signal whose offset has been adjusted to generate a position error signal of the objective lens.

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Office Action dated Oct. 31, 2008 issued in the corresponding Chinese Patent Application No. 200680004359.X and English translation thereof.
International Search Report for corresponding Application No. PCT/JP2006/305550 mailed Jun. 27, 2006.
PCT/ISA/237 with partial English translation.

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