Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Including radiation storage or retrieval
Reexamination Certificate
2007-01-30
2007-01-30
Wellington, Andrea (Department: 2627)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Including radiation storage or retrieval
C369S044410, C369S044320
Reexamination Certificate
active
11079109
ABSTRACT:
An error signal detection method includes detecting light incident through an objective lens after having been reflected and diffracted from a recording medium, as eight light portions in a matrix including four inner light portions and four outer light portions, wherein the rows and columns of the matrix are parallel to the tangential and radial direction of the recording medium, respectively; calculating a first sum signal by summing a detection signal from at least one outer light portion located in a first diagonal direction, and a detection signal from an inner light portion located in a second diagonal direction; calculating second sum signal by summing a detection signal from an inner light portion located in the first diagonal direction, and a detection signal from an outer light portion located in the second diagonal direction; and comparing phases of the first and second sum signals to detect a tilt error signal.
REFERENCES:
patent: 5523989 (1996-06-01), Ishibashi
patent: 5978332 (1999-11-01), Itakura et al.
patent: 6507544 (2003-01-01), Ma et al.
patent: 6510111 (2003-01-01), Matsuura
patent: 357 323 (1990-03-01), None
patent: 953 974 (1999-11-01), None
patent: 1999-81816 (1999-11-01), None
Office Action issued in Korean Patent Application No. 2000-22804 on May 26, 2006.
Choi Byoung-ho
Chung Chong-sam
Doh Tae-yong
Ma Byung-in
Park In-sik
Ortiz-Criado Jorge L.
Samsung Electronics Co,. Ltd.
Stein, McEwen & Bui LLP
Wellington Andrea
LandOfFree
Error signal detection apparatus and method for optical... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Error signal detection apparatus and method for optical..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Error signal detection apparatus and method for optical... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3775333