Optical recording medium tilt compensation device, tilt...

Details Optical recording medium tilt compensation device, tilt... Optical recording medium tilt compensation device, tilt...

2006-03-14

2009-08-18

Feild, Joseph H (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320

Reexamination Certificate

active

07577070

ABSTRACT:
An optical recording medium tilt compensation device having a tilt compensation unit is disclosed that is able to compensate for a tilt error in servo control when recording or reproducing data in an optical recording medium. The optical recording medium tilt compensation device includes an object lens that condenses light from a light source on a recording surface of an optical recording medium; an object lens tilt actuator that controls a tilt of the object lens; an object lens tilt sensor that detects a tilt of the object lens; an optical recording medium tilt sensor that detects a tilt of the optical recording medium; a control unit that controls the tilt of the object lens in accordance with a tilt value from the optical recording medium tilt sensor so that an aberration of the spot condensed on the recording surface is minimum by driving the object lens tilt actuator; a gain variable unit that changes the magnitude of an output signal from the object lens tilt sensor or the optical recording medium tilt sensor.

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