Optical disc drive apparatus, method for measuring tilt of...

Details Optical disc drive apparatus, method for measuring tilt of... Optical disc drive apparatus, method for measuring tilt of...

2006-10-03

2006-10-03

Wellington, Andrea (Department: 2627)

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

C369S044320, C720S674000, C720S675000

Reexamination Certificate

active

07116619

ABSTRACT:
Tilt (θ(r, φ)) is measured in a measuring location (P(r, φ) optical disc (2). A pivotable objective lens (34) is brought to a first focus measuring location such as to focus a light beam (32) in a first anchor point (P1(r−Δr1, φ))having the same angular coordinate φ as said measuring location (P(r, φ)) and having a small radial distance Δr1from said measuring location. The objective lens is brought to a second focus measuring location such as to focus the light beam in a second anchor point (P2(r+Δr2, φ)) having the same angular coordinate φ as said measuring location and having a small radial distance Δr2from said measuring location, wherein said first and second anchor pints are located on opposite sides of said measuring location. Tilt in said measuring location is calculated from the coordinates of said two focus measuring locations of said objective lens.

REFERENCES:
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patent: 2003/0161232 (2003-08-01), Yoshimoto
patent: 2004/0042356 (2004-03-01), Kato et al.
patent: 2004/0125711 (2004-07-01), Sato et al.
patent: 2005/0078574 (2005-04-01), Wada et al.
patent: 2002342963 (2001-05-01), None

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