Method and apparatus for determining position of optical...

Details Method and apparatus for determining position of optical... Method and apparatus for determining position of optical...

2005-04-11

2008-11-25

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

C369S053280

Reexamination Certificate

active

07457208

ABSTRACT:
The displacement of a pick-up head along the radial direction of an optical disk is detected, and the absolute position of the pick-up head is determined by the accumulation of the displacement, hence the apparatus knows which area on the optical disk the pick-up head currently stays. After obtaining control signals for a motor to drive the pick-up head to move along the radial direction, the apparatus calculates the displacement of the pick-up head during every stroke according the control signals. Afterward, the absolute position is determined by the accumulation of the displacement during all strokes.

REFERENCES:
patent: 6407877 (2002-06-01), Mitani
patent: 6504669 (2003-01-01), Janz et al.
patent: 6597530 (2003-07-01), Asano et al.
patent: 6900958 (2005-05-01), Yi et al.
patent: 6922304 (2005-07-01), Nakagawa
patent: 7212481 (2007-05-01), Jeong et al.

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