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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:
Patents under this class:
| Patent Number |
Title Of Patent |
Date Issued |
| 7616539 |
Optical disc apparatus, tracking control method, and integrated circuit |
Nov. 10, 2009 |
| 7613097 |
Optical pickup apparatus with bilaterally divided light beams |
Nov. 3, 2009 |
| 7606123 |
Light receiving and emitting integrated device, optical pickup provided therewith, and optical disk apparatus |
Oct. 20, 2009 |
| 7606122 |
Layer-jumping and focusing control method |
Oct. 20, 2009 |
| 7590034 |
Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecti |
Sep. 15, 2009 |
| 7580332 |
Optical pickup, optical disk drive, light detecting apparatus, and signal generating method for optical pickup |
Aug. 25, 2009 |
| 7564749 |
Interface device for optical recording and/or reproducing apparatus |
Jul. 21, 2009 |
| 7558162 |
Optical pick-up head, optical information apparatus, and optical information reproducing method |
Jul. 7, 2009 |
| 7558170 |
Optical pick-up head, optical information apparatus, and optical information reproducing method |
Jul. 7, 2009 |
| 7539090 |
Optical pick-up head, optical information apparatus, and optical information reproducing method |
May. 26, 2009 |
| 7535806 |
Apparatus and method for detecting laser dropout |
May. 19, 2009 |
| 7522487 |
Light receiving amplifier circuit and optical pickup device having the same |
Apr. 21, 2009 |
| 7518976 |
Optical head with light sources of different wavelength |
Apr. 14, 2009 |
| 7499382 |
Method for gain adjustment for production of a lens position signal, and a corresponding appliance for reading from and/or writing to an optical recording medium |
Mar. 3, 2009 |
| 7470879 |
Optical pickup, information processing apparatus and signal processing method |
Dec. 30, 2008 |
| 7466959 |
Apparatus and method for IF switching in a dual-tuner, dual-IF, HD radio and FM/AM radio receiver |
Dec. 16, 2008 |
| 7466636 |
Method for generating a corrected error signal, and corresponding apparatus |
Dec. 16, 2008 |
| 7463560 |
Optical disc device |
Dec. 9, 2008 |
| 7463561 |
Optical pick-up head, optical information apparatus, and optical information reproducing method |
Dec. 9, 2008 |
| 7460448 |
Optical pick-up head, optical information apparatus, and optical information reproducing method |
Dec. 2, 2008 |
| 7450477 |
Optical pickup having a polarization beam splitter |
Nov. 11, 2008 |
| 7450487 |
Optical pickup apparatus |
Nov. 11, 2008 |
| 7440364 |
Tracking error signal generation device and tracking error signal generation method |
Oct. 21, 2008 |
| 7440367 |
Land Pre-Pit data detection apparatus and method thereof |
Oct. 21, 2008 |
| 7432487 |
Device for correcting output of optical pickup |
Oct. 7, 2008 |
| 7426172 |
Optical module and optical pickup including the same |
Sep. 16, 2008 |
| 7420895 |
Signal detection method and apparatus and optical recording and/or reproducing apparatus using the same |
Sep. 2, 2008 |
| 7411872 |
Servo-tracking and three-dimensional alignment in page-based data optical storage |
Aug. 12, 2008 |
| 7409461 |
Dynamic file-based routing in a broadband communications system |
Aug. 5, 2008 |
| 7397736 |
Optical disc device and tracking controlling method therefor |
Jul. 8, 2008 |
| 7394049 |
Optical disk apparatus and pickup unit |
Jul. 1, 2008 |
| 7385888 |
Tracking system with dual differential signals with fraction of A/C signal added back to D/C signal |
Jun. 10, 2008 |
| 7379399 |
Optical disc, and reading system and manufacturing method of the disc |
May. 27, 2008 |
| 7369466 |
Optical pickup apparatus and method for controlling phases of three beams |
May. 6, 2008 |
| 7362689 |
Optical pickup and optical recording and/or reproducing apparatus adopting the same |
Apr. 22, 2008 |
| 7355954 |
Laser module, optical pickup device, optical disk device, focus error detection method and tracking error detection method |
Apr. 8, 2008 |
| 7356311 |
Wireless audio signal and control signal device and method thereof |
Apr. 8, 2008 |
| 7349298 |
Optical disc drive including detection and correction of spherical aberration |
Mar. 25, 2008 |
| 7345964 |
Method and related apparatus for deriving a tracking error signal |
Mar. 18, 2008 |
| 7342854 |
Apparatus for generating tracking error signals |
Mar. 11, 2008 |
| 7319643 |
Method for detecting servo error, apparatus therefor, disk which maintains quality of servo error signal, method of controlling servo of disk recording/reproducing apparatus, method of detecti |
Jan. 15, 2008 |
| 7313061 |
Optical pickup having a plurality of photodetectors divided into four regions used to obtain both focus and tracking error signals |
Dec. 25, 2007 |
| 7310291 |
Method and apparatus for tracking error detection in optical disk driver |
Dec. 18, 2007 |
| 7301859 |
Track error detection device having a function of removing a phase offset, and phase offset removing method thereof |
Nov. 27, 2007 |
| 7298675 |
Multilayer recording medium and optical pickup for recording and/or reproducing the same |
Nov. 20, 2007 |
| 7298676 |
Optical pickup apparatus having optical detection area for compensating for tracking error offset |
Nov. 20, 2007 |
| 7295498 |
Disk apparatus and method of generating a tracking error signal |
Nov. 13, 2007 |
| 7292516 |
Sensor optimized for phase detection in page-based optical data storage |
Nov. 6, 2007 |
| 7289399 |
Tracking error detection apparatus including reduction in false tracking error detection during phase error detection |
Oct. 30, 2007 |
| 7283440 |
Tracking error signal detecting method selectively using a push-pull method, an improved push-pull method, and a three beam method and optical recording/reproducing apparatus using the same |
Oct. 16, 2007 |
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