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Browse by Category: Main > Information Technology
Class Information
Number: 369/53.23
Name: Dynamic information storage or retrieval > Condition indicating, monitoring, or testing > Including radiation storage or retrieval > Of record carrier > By detection of storage medium incident radiation > Derived focusing or tracking related signal
Description: Subject matter wherein the detected radiation is converted into a signal indicative of a) a light beam focal point or a focusing error, or b) a crossing of a track by a transducing light beam or a light beam tracking error.










Patents under this class:
1 2 3 4 5 6 7

Patent Number Title Of Patent Date Issued
8665689 Multi-layer optical disc and optical disc apparatus Mar. 4, 2014
8638646 Optical information processing method and optical information processing apparatus Jan. 28, 2014
8599664 Method and apparatus for determining unbalanced disc and optical information storage medium system using the same Dec. 3, 2013
8593922 Optical disc apparatus, focus control method and control program Nov. 26, 2013
8582402 Optical recording medium and recording device Nov. 12, 2013
8576683 Disk decision method and optical disk drive using the disk decision method Nov. 5, 2013
8565056 Method of generating tracking error signal, optical pickup device, and optical disc drive device adopting the method Oct. 22, 2013
8553508 Focus servo control device, and information recording/reproducing device using the same Oct. 8, 2013
8553515 System and method for precise servoing Oct. 8, 2013
8547812 Optical disc device and method for setting playback power of optical disc device Oct. 1, 2013
8547809 Optical disk device Oct. 1, 2013
8542565 Optical drive apparatus Sep. 24, 2013
8526277 Method for determining type of optical disk and optical storage device Sep. 3, 2013
8526287 Optical disk apparatus Sep. 3, 2013
8514680 Recording device and spot position control method Aug. 20, 2013
8509041 Recording apparatus and recording method Aug. 13, 2013
8503276 Optical disk drive and method for determining type of a blu-ray disk Aug. 6, 2013
8483024 Disc discrimination apparatus and method Jul. 9, 2013
8477577 Method for recording on and reading out from optical information recording medium Jul. 2, 2013
8472290 Apparatus and method identifying disc type Jun. 25, 2013
8462600 Optical disc device Jun. 11, 2013
8456974 Recording adjusting method, information recording and reproducing device, and information recording medium Jun. 4, 2013
8446802 Optical drive device and focus servo control method May. 21, 2013
8427923 Optical pickup device, optical disc device and focus adjusting method Apr. 23, 2013
8427918 Optical disk drive Apr. 23, 2013
8427914 Lens pull-in method for near-field optical accessing system Apr. 23, 2013
8427911 Optical pickup Apr. 23, 2013
8422347 Method for determining phase difference of tracking error signal in optical disc drive Apr. 16, 2013
8416662 Optical disc drive and method for detecting vertical deviation thereon Apr. 9, 2013
8411542 Method for controlling layer changes for an optical disk drive Apr. 2, 2013
8411543 Recording apparatus and control method Apr. 2, 2013
8406100 Optical disc device and tracking servo control circuit therefor Mar. 26, 2013
8339907 Optical storage focus servo system and method of controlling same Dec. 25, 2012
8305851 Optical disk apparatus Nov. 6, 2012
8289819 Information reproducing apparatus and information reproducing method Oct. 16, 2012
8274875 Optical disc device and focus control method Sep. 25, 2012
8233365 Methods and apparatuses for detecting a modulation transition in an optical storage medium Jul. 31, 2012
8213279 Optical recording medium and optical recording-reading method Jul. 3, 2012
8203924 Optical information recording/reproducing apparatus Jun. 19, 2012
8184509 Optical pickup device and optical disk device using the same May. 22, 2012
8174946 Optical disk apparatus and method of controlling optical disk apparatus May. 8, 2012
8164999 Optical disc apparatus and method for determining information recording layer in optical disc Apr. 24, 2012
8159924 Optical disc device and media type determination method Apr. 17, 2012
8149668 Optical disk drive and method for determining disk type Apr. 3, 2012
8149670 Optical disk apparatus and method of driving the same Apr. 3, 2012
8130615 Device and method for generating track-crossing signal in optical disc drive Mar. 6, 2012
RE43179 Optical disk drive for discriminating types of optical disks Feb. 14, 2012
8111596 Phase error detection apparatus Feb. 7, 2012
8111603 Optical disk apparatus and its reproducing method Feb. 7, 2012
8111600 Method of vertical deviation disc detection Feb. 7, 2012

1 2 3 4 5 6 7










 
 
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