Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2004-01-20
2008-11-18
Young, Wayne R (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112240, C359S708000, C359S710000, C359S718000, C359S719000
Reexamination Certificate
active
07453788
ABSTRACT:
An optical head is provided that increases the light utilization efficiency and that can be adapted to high-speed recording and double-layer disks. A beam-shaping lens that shapes an elliptical beam emitted from a light source into a substantially circular beam has a pair of cylindrical surfaces that are curved in the same direction. The cylindrical surface that is closer to the light source is an aspherical surface, and the cylindrical surface that is closer to the light source is a spherical surface. Thus, an optical head is obtained, with which aberrations can be kept low, even when the beam-shaping magnifying power is about a factor 2.
REFERENCES:
patent: 5251060 (1993-10-01), Uenishi et al.
patent: 5420722 (1995-05-01), Bielak
patent: 5467335 (1995-11-01), Braat
patent: 5535058 (1996-07-01), Tanaka et al.
patent: 5608708 (1997-03-01), Ophey
patent: 5625402 (1997-04-01), Sarraf
patent: 5917660 (1999-06-01), Ohtaki
patent: 6088170 (2000-07-01), Lee et al.
patent: 6567354 (2003-05-01), Yanagawa
patent: 6721259 (2004-04-01), Yamamoto et al.
patent: 2001/0010583 (2001-08-01), Ando
patent: 2002/0089904 (2002-07-01), Takeshita
patent: 19916573 (2000-10-01), None
patent: 59-109021 (1984-06-01), None
patent: 63-118714 (1988-05-01), None
patent: 2002-208159 (2002-07-01), None
Komma Yoshiaki
Shimizu Yoshiyuki
Tanaka Yasuhiro
Yasuda Akihiro
Bibbins LaTanya
Hamre Schumann Mueller & Larson P.C.
Panasonic Corporation
Young Wayne R
LandOfFree
Optical head, optical information recording/reproducing... 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 head, optical information recording/reproducing..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical head, optical information recording/reproducing... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4047700