Method and device for measuring the tilt of an optical disc

Details Method and device for measuring the tilt of an optical disc Method and device for measuring the tilt of an optical disc

2004-03-10

2008-11-25

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320

Reexamination Certificate

active

07457217

ABSTRACT:
A method and device for measuring the tilt in an optical disc drive (1) is disclosed. The optical disc drive (1) comprises two lasers (31, 41) generating two laser beams (32, 42) having mutually different optical characteristics. One of these laser beams (32) is continuously ON, and is used for writing or reading data to or form the disc. The other laser beam (42) is repeatedly switched ON and OFF. Tilt is measured by comparing a normalized error signal (RES(ON)) during the ON-phase (TON) with a normalized error signal (RES(OFF)) during the OFF-phase.

REFERENCES:
patent: 5751680 (1998-05-01), Ishibashi et al.
patent: 5768232 (1998-06-01), Muramatsu et al.
patent: 6304526 (2001-10-01), Nagashima et al.
patent: 6545958 (2003-04-01), Hirai et al.
patent: 2003/0058758 (2003-03-01), Takeda

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