Control unit and optical disk drive including the control unit

Details Control unit and optical disk drive including the control unit Control unit and optical disk drive including the control unit

2007-10-02

2007-10-02

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C369S044250, C369S044270

Reexamination Certificate

active

10596108

ABSTRACT:
An information processing apparatus includes: a converging section for converging light; a shifting section for shifting the focus of the light by moving the converging section perpendicularly to an information storage layer of a storage medium responsive to a drive signal; a position control section for generating a position control signal to move the converging section at variable velocities; a focus control section for generating a focus control signal based on a light amount signal representing reflected light such that the focus is located in a focus controllable range; a switching section for selectively outputting the position control or focus control signal; and a driving section for outputting a drive signal responsive to the output signal.

REFERENCES:
patent: 5060215 (1991-10-01), Kawamura et al.
patent: 5286965 (1994-02-01), Okada
patent: 60-129934 (1985-09-01), None
patent: 62-138315 (1987-09-01), None
patent: 2-42214 (1990-03-01), None
patent: 02-162531 (1990-06-01), None
patent: 04-141830 (1992-05-01), None
International Search Report for corresponding Application No. PCT/JP2004/017469 mailed Jan. 25, 2005.
Fom PCT/ISA/237 and concise explanation, 2005.

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