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Class Information
Number: 369/44.42
Name: Dynamic information storage or retrieval > With servo positioning of transducer assembly over track combined with information signal processing > Optical servo system > Arithmetic operation using plural photodetectors > Beam or detector is not rectangular or circular
Description: Subject matter wherein either the beam or the detector has a shape other than rectangular or circular.
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7447139 |
Light-receiving element, optical head, optical recording/reproducing apparatus, and method of optical recording and reproduction |
Nov. 4, 2008 |
| 7420897 |
Optical head, an optical disk device and an integrated circuit |
Sep. 2, 2008 |
| 7319644 |
Optical head, light-emitting/receiving device, and apparatus for recording/reproducing optical recording/recorded medium |
Jan. 15, 2008 |
| 7313079 |
Method and apparatus for header detection and protection |
Dec. 25, 2007 |
| 7274633 |
Optical pickup |
Sep. 25, 2007 |
| 7095687 |
Optical pickup device that corrects the spot shape of reflected light beams |
Aug. 22, 2006 |
| 7068572 |
Optical head and optical disk apparatus |
Jun. 27, 2006 |
| 7016274 |
Optical pickup system with light receiving portion |
Mar. 21, 2006 |
| RE39013 |
Method and apparatus for optical recording and reproducing with tracking servo reducing track offset |
Mar. 14, 2006 |
| 6967908 |
Optical pickup device with focus error detecting optical element and method for focus error detection |
Nov. 22, 2005 |
| 6940789 |
Optical pickup device that corrects the spot shape of reflected light beams |
Sep. 6, 2005 |
| 6928035 |
Optical pick-up, optical disk apparatus and information processing apparatus |
Aug. 9, 2005 |
| 6879557 |
Optical recording medium having pits disposed in a matrix layout and apparatus for processing thereof |
Apr. 12, 2005 |
| 6873581 |
Semiconductor laser device and optical pickup apparatus |
Mar. 29, 2005 |
| 6807133 |
Optical head and optical disk apparatus |
Oct. 19, 2004 |
| 6801491 |
Focus error detecting apparatus of optical pickup with a light separating and astigmatism generation optical element and detection method thereof |
Oct. 5, 2004 |
| 6801484 |
Method for generating header and transition flags using DPD technology and optical device using the same |
Oct. 5, 2004 |
| 6798723 |
Optical pickup head and information recording/reproducing device |
Sep. 28, 2004 |
| 6744707 |
Optical head device, inclination detection apparatus using the same, and optical information processing apparatus using the same |
Jun. 1, 2004 |
| 6741540 |
Optical pickup device, information reproduction/recording apparatus, and information processing apparatus |
May. 25, 2004 |
| 6674695 |
Tracking controller for recording track of narrow track pitch |
Jan. 6, 2004 |
| 6657930 |
Tracking control circuit for tracking a wobbling track formed on an optical recording medium |
Dec. 2, 2003 |
| 6594221 |
Optical pickup device |
Jul. 15, 2003 |
| 6584049 |
Device for reducing cross talk in signal detecting apparatus used in an optical pickup device |
Jun. 24, 2003 |
| 6507544 |
Error signal detection apparatus and reproduction signal detection apparatus for optical recording/reproducing system and method therefor |
Jan. 14, 2003 |
| 6407966 |
Apparatus and method for differential wax-wane focusing and push-pull tracking for magneto-optical data storage |
Jun. 18, 2002 |
| 6275463 |
Optical head |
Aug. 14, 2001 |
| 6229771 |
Method and apparatus for generating focus error signals in a multi-beam optical disk drive |
May. 8, 2001 |
| 6222804 |
Optical head apparatus |
Apr. 24, 2001 |
| 6212149 |
Modified light-receiving element in an optical pickup for reading optical discs |
Apr. 3, 2001 |
| 6167006 |
Optical information recording/reproducing apparatus based on tracking control of irradiated light |
Dec. 26, 2000 |
| 6160774 |
Position sensor for tracking system for optical data storage |
Dec. 12, 2000 |
| 6147945 |
Recording/reproducing apparatus and method |
Nov. 14, 2000 |
| 6094411 |
Confocal microscope with optical recording and reproducing apparatus |
Jul. 25, 2000 |
| 6023449 |
Optical pickup for adjusting focus error signal offset and having widely separated photodetector elements |
Feb. 8, 2000 |
| 5991249 |
Optical track sensing device |
Nov. 23, 1999 |
| 5909415 |
Positioning control system which generates a servo-error signal in accordance with a difference between detection currents |
Jun. 1, 1999 |
| 5802029 |
Reproduction and/or recording device for optical recording media of varying storage density |
Sep. 1, 1998 |
| 5802037 |
Optical detector with two detecting regions for reproducing and recording information on two kinds of disks having different thicknesses |
Sep. 1, 1998 |
| 5798989 |
Optical pickup device for reproducing information recorded on a recording medium |
Aug. 25, 1998 |
| 5787060 |
Optical data recording/reproducing apparatus for producing data and servo signals using different light receiving areas of a light receiver |
Jul. 28, 1998 |
| 5748599 |
Holographic optical device |
May. 5, 1998 |
| 5719835 |
Light detecting device for receiving light from corresponding portions of a recording medium |
Feb. 17, 1998 |
| 5708634 |
Focussing system and methods for multi-track optical disk apparatus |
Jan. 13, 1998 |
| 5687146 |
Focus control device for use with an optical pickup comprising a refracting means |
Nov. 11, 1997 |
| 5673241 |
Focus detection mechanism and optical head and optical storage device that use it |
Sep. 30, 1997 |
| 5671208 |
Photodetector disposed on both sides of an objective lens for receiving .+-. 1st order diffractive light |
Sep. 23, 1997 |
| 5629911 |
Optical information recording/reproduction apparatus including an integrated photodetector used in the detection of focusing and/or tracking error signals |
May. 13, 1997 |
| 5617389 |
Method of reproducing information of optical disc, method of recording and reproducing the same, apparatus for reproducing the same, and light detecting apparatus used in the reproducing appar |
Apr. 1, 1997 |
| 5612937 |
Optical pickup apparatus having a bisected optical receiving element for tracking control |
Mar. 18, 1997 |
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