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公开(公告)号：EP1561208A2
公开(公告)日：2005-08-10
申请号：EP03772297.2
申请日：2003-11-03
发明人： RICHTER, Hartmut , HOFMANN, Holger , KNAPPMANN, Stephan , BALLWEG, Christof , BÜCHLER, Christian
CPC分类号： G11B7/24085 , G11B7/007
摘要： The invention relates to a method for storing data in a prerecorded area of an optical recording medium, and to an optical recording medium having at least one prerecorded area in which data is stored according to the method.It is an object to propose a method for storing data in a prerecorded area of an optical recording medium using pits (6) and lands ( 7), whereby the signal obtained from the pits ( 6) and lands (7) is compatible with a high frequency modulated groove signal.According to the invention, the pits ( 6) and lands( 7) adjacent to bit cell signal transitions( 1, 2, 3, 4) are arranged in a predefined manner, either in a fixed recurring sequence of pits 6) and lands (7) or symmetrically to the bit cell signal transitions (1, 2, 3, 4).
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公开(公告)号：EP1979903B1
公开(公告)日：2010-08-04
申请号：EP07703716.6
申请日：2007-01-09
申请人： Thomson Licensing
CPC分类号： G11B20/1816 , G11B19/04 , G11B27/36 , G11B2220/257
摘要： The present invention relates to a method for controlling the quality of storage media, and more specifically to a method for determining if the quality of a storage medium decreases. A method according to the invention has the steps of: - determining (23) one or more quality parameters of the storage medium; and - comparing (25) one or more of the determined quality parameters with previously determined quality parameters of the storage medium stored in a memory in case the quality of the storage medium has been determined before.
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公开(公告)号：EP1886309A1
公开(公告)日：2008-02-13
申请号：EP06754972.5
申请日：2006-05-03
申请人： Thomson Licensing
发明人： KNITTEL, Joachim , RICHTER, Hartmut
CPC分类号： G11B7/121 , G11B7/08576 , G11B7/0932 , G11B7/124 , G11B7/1362
摘要： The invention relates to a compact optical pickup for a micro optical drive, and to a micro optical drive using this compact optical pickup. According to the invention a pickup for optical recording media (8) includes a light source for generating a light beam for reading from and/or writing to an optical recording medium, a flexible arm (12) serving as a focus actuator, an objective lens (7) situated on the flexible arm (12) for focusing the light beam onto the optical recording medium, an optical bench for directing the light beam towards the optical recording medium (8), one or more detectors (11, 12) for detecting the light beam reflected by the optical recording medium, and a mirror (9), which is arranged inclined with respect to a transparent block (10) of the optical bench, for directing the light beam reflected by the optical recording medium (8) towards a first detector (11).
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公开(公告)号：EP1856693A2
公开(公告)日：2007-11-21
申请号：EP06708415.2
申请日：2006-02-21
申请人： Thomson Licensing
IPC分类号： G11B7/0065 , G11B7/007 , G11B7/09 , G11B7/24 , G11B7/095
CPC分类号： G11B7/0065 , G03H1/0252 , G03H1/0256 , G11B7/00745 , G11B7/00781 , G11B7/0956 , G11B7/24041 , G11B7/24044
摘要： The present invention relates to a holographic recording medium (9) adapted to store additional information for the recorded holograms, and to a holographic pickup (1) for a holographic storage system for use with the holographic recording medium (9) . According to the invention, the holographic recording medium (9) has a holographic layer (94) for storing holograms and a servo layer (92) for positioning a light beam for reading and/or recording of a hologram relative to the holographic recording medium, wherein the servo layer (92) is recordable or rewritable. A holographic pickup (1) for use with such a holographic recording medium (9) includes a light source (13) for recording additional data in the servo layer (92) of the holographic recording medium (9) .
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公开(公告)号：EP2074618B1
公开(公告)日：2010-08-04
申请号：EP07820512.7
申请日：2007-09-24
申请人： Thomson Licensing
CPC分类号： G11B7/24079 , G11B7/1374 , G11B2007/24308 , G11B2007/24314
摘要： The optical recording medium has a recording layer sensitive for recording at a first wavelength and sensitive for reading at a second wavelength, the recording layer having a groove structure, wherein at the first wavelength the groove structure has a diffraction efficiency into a first diffraction order sufficiently large to generate a push-pull signal, and at the second wavelength it has a diffraction efficiency into a first diffraction order close to zero. The optical pickup for recording on an optical recording medium intended to be read with a second wavelength and a second numerical aperture is characterized in that it has a light source for generating a light beam at a first wavelength and a numerical aperture given by the second numerical aperture multiplied with a ration of the first wavelength and the second wavelength.
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公开(公告)号：EP2074618A1
公开(公告)日：2009-07-01
申请号：EP07820512.7
申请日：2007-09-24
申请人： Thomson Licensing
CPC分类号： G11B7/24079 , G11B7/1374 , G11B2007/24308 , G11B2007/24314
摘要： The optical recording medium has a recording layer sensitive for recording at a first wavelength and sensitive for reading at a second wavelength, the recording layer having a groove structure, wherein at the first wavelength the groove structure has a diffraction efficiency into a first diffraction order sufficiently large to generate a push-pull signal, and at the second wavelength it has a diffraction efficiency into a first diffraction order close to zero. The optical pickup for recording on an optical recording medium intended to be read with a second wavelength and a second numerical aperture is characterized in that it has a light source for generating a light beam at a first wavelength and a numerical aperture given by the second numerical aperture multiplied with a ration of the first wavelength and the second wavelength.
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公开(公告)号：EP1332495A2
公开(公告)日：2003-08-06
申请号：EP01989431.0
申请日：2001-10-29
发明人： HOFMANN, Holger , RICHTER, Hartmut
CPC分类号： G11B7/1263 , G11B7/0052 , G11B7/00718 , G11B7/00736 , G11B7/00745 , G11B7/0903 , G11B7/13 , G11B7/24038 , G11B7/24085 , G11B7/24088 , G11B20/00086 , G11B20/00586 , G11B23/281 , G11B2007/0013
摘要： The invention refers to a device and a method for scanning an optical data carrier (1) by means of a main scanning beam (3) being reflected by the data carrier (1) and being detected by means of a photodetector (10), the data carrier (1) having first and second layers (11,12) to be scanned, the second layer (12) being scanned through the first layer (11), light passing the first layer (11) being shaded dependent on local properties of the first layer (11).An object of the invention is to propose a device having increased performance even for use with multi layer disks (1) having a layer (11) causing light fluctuations on a layer (12) to be scanned, as well as a respective method.According to the invention such device is provided with means (2,7,17) for keeping an output signal (D) of the photodetector (10) independent of variations of shading.
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公开(公告)号：EP1295286A1
公开(公告)日：2003-03-26
申请号：EP01940540.6
申请日：2001-05-29
发明人： DAMBACH, Sören , RICHTER, Hartmut
CPC分类号： G11B7/1353 , G11B2007/0006
摘要： The invention relates to a device for reading and/or writing optical recording media (1) comprising a first laser diode (LD1) for generating a first scanning beam (AS1) of a first wavelength μ1 and comprising a second laser diode (LD2) for generating a second scanning beam (AS2) of a second wavelength μ2. Scanning beams (AS1, AS2) extend along a common optical axis (9), scan an information layer (6) of the recording medium (1), and strike a single photodetector (8) for generating an information signal (IS), whereby a beam combination element is arranged at a point on the optical axis (9) According to the invention, the beam combination element is a diffraction grating (12).
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公开(公告)号：EP1561208B1
公开(公告)日：2013-03-20
申请号：EP03772297.2
申请日：2003-11-03
申请人： Thomson Licensing
发明人： RICHTER, Hartmut , HOFMANN, Holger , KNAPPMANN, Stephan , BALLWEG, Christof , BÜCHLER, Christian
CPC分类号： G11B7/24085 , G11B7/007
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公开(公告)号：EP1332495B1
公开(公告)日：2009-03-25
申请号：EP01989431.0
申请日：2001-10-29
申请人： Thomson Licensing
发明人： HOFMANN, Holger , RICHTER, Hartmut
CPC分类号： G11B7/1263 , G11B7/0052 , G11B7/00718 , G11B7/00736 , G11B7/00745 , G11B7/0903 , G11B7/13 , G11B7/24038 , G11B7/24085 , G11B7/24088 , G11B20/00086 , G11B20/00586 , G11B23/281 , G11B2007/0013
摘要： The invention refers to a device and a method for scanning an optical data carrier (1) by means of a main scanning beam (3) being reflected by the data carrier (1) and being detected by means of a photodetector (10), the data carrier (1) having first and second layers (11,12) to be scanned, the second layer (12) being scanned through the first layer (11), light passing the first layer (11) being shaded dependent on local properties of the first layer (11).An object of the invention is to propose a device having increased performance even for use with multi layer disks (1) having a layer (11) causing light fluctuations on a layer (12) to be scanned, as well as a respective method.According to the invention such device is provided with means (2,7,17) for keeping an output signal (D) of the photodetector (10) independent of variations of shading.
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