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Class Information
Number: 369/44.23
Name: Dynamic information storage or retrieval > With servo positioning of transducer assembly over track combined with information signal processing > Optical servo system > Optical head servo system structure > Structure for shaping beam or causing astigmatic condition
Description: Subject matter having means to modify the cross-sectional profile or energy distribution of the beam or cause an astigmatic beam condition.

Sub-classes under this class:

Class Number Class Name Patents
369/44.24 Means to mask or shield a portion of the beam 247

Patents under this class:

Patent Number Title Of Patent Date Issued
8659985 Optical pickup and optical read/write drive Feb. 25, 2014
8638646 Optical information processing method and optical information processing apparatus Jan. 28, 2014
8619520 Lens driving unit for optical pickup and optical disc drive including the lens driving unit Dec. 31, 2013
8611198 Method for identifying group of multilayer disc, and optical disc device Dec. 17, 2013
8553515 System and method for precise servoing Oct. 8, 2013
8553508 Focus servo control device, and information recording/reproducing device using the same Oct. 8, 2013
8547814 Semiconductor laser device, optical pickup apparatus, and method of manufacturing semiconductor laser device Oct. 1, 2013
8531926 Optical system for optical pickup Sep. 10, 2013
8526277 Method for determining type of optical disk and optical storage device Sep. 3, 2013
8503272 Recording/reproducing apparatus having an optical pickup device to read from and record information to disks of different thicknesses Aug. 6, 2013
8498190 Optical head using beam dividing element Jul. 30, 2013
8498187 Optical disc apparatus and optical disc discriminating method Jul. 30, 2013
8488434 Objective lens, optical pickup apparatus using the same, and method for manufacturing objective lens Jul. 16, 2013
8477580 Objective lens, optical pickup, and optical drive device Jul. 2, 2013
8477575 Optical disc apparatus Jul. 2, 2013
8477574 Optical disk device Jul. 2, 2013
8472299 Optical element and optical pickup device using the same Jun. 25, 2013
8467282 Optical disc device, optical head, and information processing device Jun. 18, 2013
8441908 Optical pickup device May. 14, 2013
8441900 Objective lens and optical pick-up device using the same May. 14, 2013
8432783 Optical pickup device and position adjusting method for light separating element Apr. 30, 2013
8427924 Optical pickup apparatus Apr. 23, 2013
8427914 Lens pull-in method for near-field optical accessing system Apr. 23, 2013
8427911 Optical pickup Apr. 23, 2013
8416656 Reproducing method and reproducing apparatus Apr. 9, 2013
8411542 Method for controlling layer changes for an optical disk drive Apr. 2, 2013
8400901 Optical pickup device Mar. 19, 2013
8391121 Optical head device and reading system for multi-layered optical recording medium Mar. 5, 2013
8363516 Method and apparatus for compensating astigmatism in an optical storage system Jan. 29, 2013
8358571 Optical pickup device Jan. 22, 2013
8345528 Optical pickup device Jan. 1, 2013
8339907 Optical storage focus servo system and method of controlling same Dec. 25, 2012
8331211 Optical pickup device Dec. 11, 2012
8310910 Optical pickup device Nov. 13, 2012
8305862 Optical information recording and reproducing device Nov. 6, 2012
8300513 Optical head, optical head manufacturing method and optical disc device Oct. 30, 2012
8295143 Aberration correcting device, optical device, and optical head device Oct. 23, 2012
8289828 Optical data recording/reproduction apparatus Oct. 16, 2012
8270280 Optical pickup device Sep. 18, 2012
8270265 Optical pickup device and optical disk device Sep. 18, 2012
8269157 Optical imaging system Sep. 18, 2012
8264922 Optical disc drive having a mechanism to reduce the noise level of a focus error signal Sep. 11, 2012
8254237 Diffraction grating, optical pickup device and optical disc apparatus Aug. 28, 2012
8248891 Near-field transducers for focusing light Aug. 21, 2012
8233364 Method and device for identifying optical disc Jul. 31, 2012
8228778 Optical pickup device and optical disc device Jul. 24, 2012
8223602 Optical disc drive Jul. 17, 2012
8208354 Optical disc apparatus, driving method of optical disc apparatus Jun. 26, 2012
8199614 Aberration correction element for use in reading and writing data on multiple types of optical recording media Jun. 12, 2012
8194522 Aspheric lens and optical pickup including the same Jun. 5, 2012

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