Dynamic information storage or retrieval – With servo positioning of transducer assembly over track... – Optical servo system
Reexamination Certificate
2007-01-30
2007-01-30
Tran, Thang V. (Department: 2627)
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
Optical servo system
C369S044230, C369S112020, C369S112160, C369S112240, C369S116000
Reexamination Certificate
active
10527870
ABSTRACT:
A optical scanning device (1) for scanning an information layer (2) with a radiation beam (25) in a writing mode and a reading mode comprises a radiation source (7) for emitting the beam and an objective lens (10) for converging the beam so as to form a scanning spot (19) in the information layer. The device also includes a scanning spot power switch (20) for switching the size of the cross-section of the beam between a first size at the writing mode and a second, larger size at the reading mode so as to switch the rim intensity of the beam between a first intensity level (Irim,writing) at the writing mode and a second, higher intensity level (Irim,reading) at the reading mode, thereby switching the light power of the scanning spot between a first power level (Pwriting) at the writing mode and a second, lower power level (Preading) at the reading mode.
REFERENCES:
patent: 4307929 (1981-12-01), Eveleth et al.
patent: 4363113 (1982-12-01), Taner et al.
patent: 4737906 (1988-04-01), Edwards
patent: 4770507 (1988-09-01), Arimoto et al.
patent: 5398223 (1995-03-01), Tsujioka et al.
patent: 5644413 (1997-07-01), Komma et al.
patent: 5737299 (1998-04-01), Yoo et al.
patent: 6166854 (2000-12-01), Katsuma
patent: 6342976 (2002-01-01), Nomura et al.
patent: 6791934 (2004-09-01), Shimano et al.
patent: 6940794 (2005-09-01), Hayashi
patent: 2004/0257961 (2004-12-01), Nishi et al.
patent: 2005/0117494 (2005-06-01), Nishi et al.
patent: 08102079 (1996-04-01), None
patent: 10269585 (1998-10-01), None
patent: 11259895 (1999-09-01), None
patent: 2001307365 (2001-11-01), None
Hendriks Bernardus Hendrikus Wilhelmus
Kuiper Stein
Liedenbaum Coen Theodorus Hubertus Fransiscus
Tukker Teunis Willem
Belk Michael E.
Koninklijke Philips Electronics , N.V.
LandOfFree
Optical scanning device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Optical scanning device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical scanning device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3786108