Dynamic information storage or retrieval – Specific detail of information handling portion of system – Radiation beam modification of or by storage medium
Reexamination Certificate
2006-03-02
2010-10-26
Agustin, Peter Vincent (Department: 2627)
Dynamic information storage or retrieval
Specific detail of information handling portion of system
Radiation beam modification of or by storage medium
C369S112120, C369S044230
Reexamination Certificate
active
07821902
ABSTRACT:
An aberration detection device of the present invention is such that an absolute value of detection sensitivity of an aberration error signal is increased, and variation in detection sensitivity of the aberration error signal is little even when displacement between the center of light beam dividing means and the center of a bundle of light beams occurs due to a shift of a condensing optical system at the time of tracking control. A hologram element (2) divides light beams reflected from an information storage medium into at least two positive first order diffracted light beams. The hologram element (2) has a line (D1) extending in a radial direction and passing through an optical axis (OZ) and a division line (D2) having segments at least both ends thereof and a bulge in a center thereof, wherein the segments are substantially parallel to the line (D1), and the bulge (44) bulges toward the periphery of the hologram element (2) so that a top (D5) of the bulge (44) is substantially parallel to the line (D1).
REFERENCES:
patent: 5301182 (1994-04-01), Komma et al.
patent: 5859818 (1999-01-01), Tateishi et al.
patent: 6407967 (2002-06-01), Odajima et al.
patent: 6956192 (2005-10-01), Ishika
patent: 7206277 (2007-04-01), Ogasawara et al.
patent: 2002/0057359 (2002-05-01), Tadano et al.
patent: 2002/0166945 (2002-11-01), Tadano et al.
patent: 2003/0227859 (2003-12-01), Hirai
patent: 2005/0047292 (2005-03-01), Park et al.
patent: 2006/0262695 (2006-11-01), Tsuchida et al.
patent: 2002-157771 (2002-05-01), None
patent: 2002-334474 (2002-11-01), None
patent: 2003-323735 (2003-11-01), None
patent: 2005-044466 (2005-02-01), None
patent: WO 2004/088645 (2004-10-01), None
Makoto Horiyama et al.; “Optical Pickup using Integrated Optical Unit for Blu-ray disc”; Jun. 5, 2006.
Y. Kanazawa et al.; “Spherical Aberration Error Signal Detection for Blu-ray Disc Optical Pickups(I)”; Extended Abstracts (The 52nd Spring Meeting, 2005); The Japan Society of Applied Physics and Related Societies No. 3; Mar. 29, 2005, 1a-ZH-12; pp. 1315.
Y. Kanazawa et al.; “Spherical Aberration Error Signal Detection for Blu-ray Disc Optical Pickups(II)”; Extended Abstracts (The 52nd Spring Meeting, 2005); The Japan Society of Applied Physics and Related Societies No. 3, Mar. 29, 2005; 1a-ZH-13; pp. 1315.
O. Nobuo et al.; “Spherical Aberration Error Detection for Blu-ray Disc Optical Pickups”; First Optical Disc Meeting, May 19, 2005.
Y. Kanazawa et al.; “Integrated Optical Unit for Blu-ray Disc”; p. 50, Nov. 23, 2005, Optics Japan 2005 Extended Abstracts, Optical Society of Japan (Japanese Society of Applied Physics.
Agustin Peter Vincent
Conlin, Esq. David G.
Edwards Angell Palmer & & Dodge LLP
Hauck Jesse
Sharp Kabushiki Kaisha
LandOfFree
Aberration detection device and optical pickup 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 Aberration detection device and optical pickup device..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Aberration detection device and optical pickup device... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4189966