G11B7/0917 - CPC Classification Index

ClassID:

198068 ⎘

G11B7/0917 - CPC Classification

Classification description:

Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation , reproducing using an optical beam at lower power ; Record carriers therefor; Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only Focus-error methods other than those covered by -

Sub-classes:

G11B2007/0919 » {Critical angle methods} 0
G11B2007/092 » {Dither methods} 1
G11B2007/0922 » {Far-field methods} 1
G11B2007/0924 » {Skewed beams methods (using an angled beam, i.e. a beam which is reflected from the disc at an angle different from 90°)} 1

Recent Application in this class:

20190341072

2019-11-07

Optical information processing device

20170148478

2017-05-25

Servo Processor Receiving Photodetector Signals

20140369175

2014-12-18

Optical pickup device

20140286148

2014-09-25

Optical disc device

20140064049

2014-03-06

Optical information recording device

20130135978

2013-05-30

Optical information reproducing apparatus

20130107685

2013-05-02

OPTICAL DISC DEVICE

20130015320

2013-01-17

METHOD AND APPARATUS FOR GENERATING FOCUS ERROR SIGNAL, OPTICAL HEAD AND OPTICAL DRIVING APPARATUS

20110255386

2011-10-20

Optical disc device

#10

20110249544

2011-10-13

Reading device

#11

20110176402

2011-07-21

FOCUS CONTROL APPARATUS, FOCUS CONTROL METHOD, OPTICAL PICKUP APPARATUS, DRIVE APPARATUS, AND OPTICAL RECORDING MEDIUM

#12

20110134730

2011-06-09

Recording apparatus and control method

#13

20110063958

2011-03-17

Servo control using digital signal processing for optical disk drive

#14

20100226229

2010-09-09

Optical pickup device

#15

20100008195

2010-01-14

Optical scanning device and method for scanning

#16

20090303852

2009-12-10

Optical scanning device and method for determining focus position

#17

20090213705

2009-08-27

Optical disc device

#18

20090154306

2009-06-18

OPTIMIZING FOCUS CROSSTALK CANCELLING

#19

20090129217

2009-05-21

Optical information recording apparatus

#20

20090080309

2009-03-26

Arithmetic processing circuit unit and disc device

#21

20090059755

2009-03-05

Method for adjusting a focus position on an optical disc and an optical disc apparatus applying the same therein

#22

20090059752

2009-03-05

Optical disc apparatus and method of driving the same

#23

20090046549

2009-02-19

Optical disc apparatus, crosstalk correction method and integrated circuit

#24

20080285424

2008-11-20

Optical pickup apparatus

#25

20080239905

2008-10-02

FOCUSING-ERROR DETECTING DEVICE AND HOLOGRAPHIC DATA-RECORDING/REPRODUCING APPARATUS HAVING THE DEVICE

#26

20080101169

2008-05-01

OPTICAL DISC DEVICE AND METHOD FOR FOCUS CONTROL

#27

20080101167

2008-05-01

Optical drive servo with a servo processor receiving photodetector signals

#28

20080089209

2008-04-17

Optical disc apparatus, focus position control method and optical disc

#29

20080019237

2008-01-24

FOCUS CONTROL IN A MULTIPLE-BEAM DISC DRIVE

#30

20080013417

2008-01-17

Method and apparatus of adjusting focusing servo in optical disc device

#31

20060181973

2006-08-17

Method and apparatus for differing focus between at least two dimensions

#32

20060153024

2006-07-13

Layer-jumping and focusing control method

#33

20060077803

2006-04-13

Method of adjusting a writing focus in an optical disc drive

#34

20050117471

2005-06-02

Optical disc device

#35

20050088923

2005-04-28

Apparatus and method for controlling tracking and focusing servo in a holographic digital data storage system

#36

20050063259

2005-03-24

Optical information recording apparatus

#37

20050030848

2005-02-10

Method for obtaining an optimum focusing point of an optical pickup unit and a servo system of an optical disk drive using this method

#38

13670936

2014-04-01

Method and apparatus for determining the cleanliness of a lens in an optical disc drive