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Class Information
Number: 369/44.41
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
Description: Subject matter where more than one of addition, subtraction, multiplication, division is performed upon an output signals of plural photodetectors for the purpose of deriving one or more servo signals.










Sub-classes under this class:

Class Number Class Name Patents
369/44.42 Beam or detector is not rectangular or circular 167


Patents under this class:
1 2 3 4 5 6 7 8 9 10 11 12 13 14

Patent Number Title Of Patent Date Issued
8675460 Optical disc device Mar. 18, 2014
8659982 Optical information recording/reproducing apparatus and optical information reproducing apparatus Feb. 25, 2014
8634284 Optical storage system having differential phase detector Jan. 21, 2014
8611200 Photo detecting element, and optical pick-up device and optical disc drive including the photo detecting element Dec. 17, 2013
8605559 Optical pickup device and optical disc apparatus Dec. 10, 2013
8605563 Optical disc device and control method of optical disc Dec. 10, 2013
8599663 High speed forward sense sampling in optical drives using placed data patterns Dec. 3, 2013
8588044 CD/DVD mode selection control using laser diode voltage Nov. 19, 2013
8576677 Optical signal detecting circuit and information reproducing device using the same Nov. 5, 2013
8576684 Compatible optical pickup and optical information storage medium apparatus using the same Nov. 5, 2013
8565056 Method of generating tracking error signal, optical pickup device, and optical disc drive device adopting the method Oct. 22, 2013
8565059 Optical pickup device and optical disc apparatus Oct. 22, 2013
8547815 Optical pickup device and optical disc apparatus Oct. 1, 2013
8531930 Optical pickup device and optical disc apparatus Sep. 10, 2013
8526289 Optical information reproducing apparatus and optical information reproducing method Sep. 3, 2013
8526287 Optical disk apparatus Sep. 3, 2013
8456971 Optical disk driving apparatus, optical disk driving system, vehicle equipped with optical disk driving system, method of correcting spherical aberration in optical disk driving apparatus, pro Jun. 4, 2013
8437231 Servo control device and optical disc device May. 7, 2013
8427917 Optical pickup apparatus, integrated circuit, and method for controlling laser output of optical pickup apparatus Apr. 23, 2013
8427922 Optical pickup device and optical disc device Apr. 23, 2013
8427923 Optical pickup device, optical disc device and focus adjusting method Apr. 23, 2013
8416672 Optical pickup, photodetector, and drive adopting the optical pickup Apr. 9, 2013
8411548 Optical pickup and optical disc apparatus Apr. 2, 2013
8374066 Optical pickup Feb. 12, 2013
8351311 Semiconductor integrated circuit and optical disk device having the same Jan. 8, 2013
8339909 Optical disc device Dec. 25, 2012
8331207 Optical pickup and optical disc unit Dec. 11, 2012
8320230 Processing circuits and methods for optical data Nov. 27, 2012
8310906 Optical disc apparatus and optical disc recording/reproducing method Nov. 13, 2012
8289826 Optical pickup and optical disc apparatus Oct. 16, 2012
8270281 Optical pickup device and optical disc apparatus using same Sep. 18, 2012
8270273 Calibration circuit and method thereof for data recovery Sep. 18, 2012
8254237 Diffraction grating, optical pickup device and optical disc apparatus Aug. 28, 2012
8238220 Pickup device Aug. 7, 2012
8223613 Optical pickup device and optical disc apparatus Jul. 17, 2012
8213278 System comprising an optical disc and an apparatus for reading of respective data Jul. 3, 2012
8203917 Optical pickup apparatus, signal generating method, and optical disk apparatus Jun. 19, 2012
8189436 Optical drive device and amplification rate determining method May. 29, 2012
8189435 Spherical aberration detecting device and an optical pickup device including same May. 29, 2012
8189434 Optical pickup unit and optical pickup device having same and information writing/reading device having same May. 29, 2012
8159908 Photo diode ic Apr. 17, 2012
8149677 Optical pickup unit and optical disk apparatus having a phase-differing periodic structure Apr. 3, 2012
8139450 Amplifier circuit and optical pickup device Mar. 20, 2012
8125862 System and method for controlling tracking in an optical drive Feb. 28, 2012
8111596 Phase error detection apparatus Feb. 7, 2012
8107329 Optical storage system having differential phase detector Jan. 31, 2012
RE43105 Tracking error detection method and optical disc reproduction apparatus using the same Jan. 17, 2012
8098561 Optical disk device and optical receiver IC Jan. 17, 2012
8094527 Optical disk apparatus Jan. 10, 2012
8094531 Apparatus for and method of detecting tracking error signals Jan. 10, 2012

1 2 3 4 5 6 7 8 9 10 11 12 13 14










 
 
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