Optical pickup, information processing apparatus and signal...

Details Optical pickup, information processing apparatus and signal... Optical pickup, information processing apparatus and signal...

2006-08-22

2008-12-30

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

C369S044410

Reexamination Certificate

active

07470879

ABSTRACT:
An optical pickup for recording or reproducing information to an optical disk, includes: a first photodetector for detecting a return light from the optical disk, wherein the first photodetector is configured so that the first photodetector is divided into three portions in a radial direction corresponding to a radial direction of the optical disk and light receiving elements at both end portions in the radial direction are divided into three portions in substantially a track direction perpendicular to the radial direction, so that the first photodetector includes a light receiving element at a central portion in the radial direction and the three light receiving portions at each of both the end portions to be seven in total to output a light receiving element signal based on light reception of the return light as a track error signal generation signal.

REFERENCES:
patent: 6480456 (2002-11-01), Kawamura et al.
patent: 7180838 (2007-02-01), Park et al.
patent: 7369466 (2008-05-01), Heor
patent: 11-353666 (1999-12-01), None

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