Recording Or Reproducing By Optical Means, E.g. Recording Using A Thermal Beam Of Optical Radiation [n: By Modifying Optical Properties Or The Physical Structure], Reproducing Using An Optical Beam At Lower Power [n: By Sensing Optical Properties]; Record Carriers Therefor; (g9b/11, G9b/13 Take Precedence) [c0406] {g11b 7/00} Patents (Class G9B/7)

  • Publication number: 20100046345
    Abstract: An optical information recording medium includes a recording layer in which a track is formed, the track having recording marks linearly arranged thereon. Each recording mark has a dimension corresponding to a reference mark length, which serves as a reference, in a track direction along which the track extends, the dimension being smaller than dimensions of the recording mark in two directions perpendicular to the track direction.
    Type: Application
    Filed: August 20, 2009
    Publication date: February 25, 2010
    Applicant: Sony Corporation
    Inventors: GORO FUJITA, TAKASHI IWAMURA
  • Publication number: 20100046341
    Abstract: An additionally recordable information recording medium has a complicated management structure for managing an unrecorded area. Therefore, there are problems that it takes a long time for a disk to startup and it is difficult to build a recording/reproducing system. The additionally recordable information recording medium according to the present invention includes a simple data structure for managing a location information for a recorded area located at the rearmost location in a user data area. An additionally recordable apparatus according to the present invention also includes means for updating the location information of the recorded area so that the recorded area located at the rearmost location in the user data area is always managed.
    Type: Application
    Filed: October 29, 2009
    Publication date: February 25, 2010
    Inventors: Hiroshi UEDA, Motoshi ITO
  • Publication number: 20100046332
    Abstract: A signal processing device for optical disks includes a reflected light process section configured to convert reflected light received by an optical pickup into an electric signal based on a first gain, wherein the optical pickup emits laser light to an optical disk and receives reflected light from the optical disk; a servo signal generation section configured to generate a servo signal by using the electric signal generated by the reflected light process section; a servo signal control section configured to control the servo signal so that a change in the amplitude of the servo signal, in response to an increase or decrease of the amount of the reflected light from the optical disk, is suppressed using an attenuator that attenuates the servo signal generated by the servo signal generation section by a factor of a second gain; and a gain setting section configured to set the first gain to the reflected light process section and the second gain to the servo signal control section substantially simultaneously.
    Type: Application
    Filed: November 25, 2008
    Publication date: February 25, 2010
    Inventors: Tatsuo Suzuki, Katsuo Hori, Toshihiko Iga
  • Publication number: 20100046349
    Abstract: A fabrication method of a multilayer optical recording medium having a plurality of recording layers, comprises a step of preparing an optical recording medium having at least one record area; a write-position mark generating step of recording write-position marks in the record area beforehand; a step of preparing an optical system including a common objective lens to focus a data recording beam and a position mark recording beam on different positions in a thickness direction of the record area; a first data writing step of writing data between the write-position marks with following the write-position marks by the data recording beam; a position mark recording step of, in parallel with the first data writing step, recording new write-position marks in the record area by the position mark recording beam; and a second data writing step of writing data between the new write-position marks with following the new write-position marks by the data recording beam.
    Type: Application
    Filed: March 29, 2007
    Publication date: February 25, 2010
    Applicant: Pioneer Corporation
    Inventors: Masaharu Nakano, Masakazu Ogasawara, Makoto Sato
  • Publication number: 20100046353
    Abstract: Light output from a laser is split into a first beam which is reflected light and a second beam which is transmitted light, by a polarization beam splitter. The polarization directions of the first beam and the second beam are orthogonal to each other. A disk includes a recording layer, a quarter wavelength plate layer, and a reflective layer. When information is recorded on the disk, the first beam, which travels inside the recording layer to the side of the reflective layer, and the second beam, which passes through the recording layer and is reflected at the reflective layer and travels inside the recording layer to the side opposite to the reflective layer, are focused on the same position. When information is reproduced from the disk, the second beam is blocked by a shutter, and the first beam reflected at the recording layer is received by a photodetector.
    Type: Application
    Filed: April 8, 2008
    Publication date: February 25, 2010
    Applicant: NEC CORPORATION
    Inventor: Ryuichi Katayama
  • Publication number: 20100039918
    Abstract: A hologram recording/reproducing device includes an optical section which irradiates a holographic recording medium with an optical beam; and a control unit which controls the optical section. The optical section includes a laser light source which emits the optical beam, and a spatial modulator which modulates the optical beam. By controlling the spatial modulator, the control unit displays a tilt-standard reference light pixel and a tilt-standard signal light pixel, and records a tilt-standard hologram.
    Type: Application
    Filed: July 17, 2009
    Publication date: February 18, 2010
    Applicant: Sony Corporation
    Inventor: Tomiji Tanaka
  • Publication number: 20100039911
    Abstract: A recording method for irradiating a multi-layered optical recording medium with a laser beam to record information thereon. The optical recording medium can form a first information recording layer that is the farthest from a light incident surface, a second information recording layer that is the second farthest from the light incident surface, and at least one third information recording layer that is located closer to the light incident surface than the second information recording layer is. The method is to record information on the second information recording layer when all the information recording layers other than the second information recording layer are either blank or have been completely recorded. This allows for realizing high-quality information recording in consideration of adherence of foreign matters or occurrence of scratches.
    Type: Application
    Filed: March 10, 2008
    Publication date: February 18, 2010
    Inventors: Takashi Kikukawa, Koji Mishima
  • Publication number: 20100039917
    Abstract: An interference-type optical pickup, an optical information detection method, and an optical information recording and reproducing apparatus, which allow easy adjustment of a path difference between two lights, have a high signal amplification effect and are suitable for size reduction of an optical system, are provided. A signal light reflected from an optical disk and a reference light branched from the same light source and guided into detectors without being projected onto the optical disk are caused to interfere with each other on detectors. Detector outputs in four interference states in which phase relationships between the reference light and the signal light are different from each other by degrees are simultaneously obtained and calculated. Accordingly, a readout signal RF that is always stable and amplified with high quality is obtained even when an optical path changes due to disk undulations.
    Type: Application
    Filed: August 11, 2009
    Publication date: February 18, 2010
    Inventor: Tatsuro IDE
  • Publication number: 20100039916
    Abstract: A control device controls a laser irradiation device to record visible information on a medium by irradiation of a laser beam. The control device includes a drawing information storage unit which stores drawing information of line segments contained in line images of characters, numbers, and symbols. A drawing information acquiring unit acquires drawing information of a line image as an object to be drawn. A thickness information acquiring unit acquires thickness information which specifies a thickness of each line segment. An overlapping line segment detecting unit detects a pair of line segments drawing ranges of which, inclusive of the line segment thickness, overlap each other, based on the thickness information and the drawing information. A line dividing/shortening unit divides or shortens at least one of the pair of line segments so that the drawing ranges of the pair of line segments do not overlap each other.
    Type: Application
    Filed: August 7, 2009
    Publication date: February 18, 2010
    Inventors: Fumihiro HASEGAWA, Tomomi ISHIMI
  • Publication number: 20100034059
    Abstract: A recording and reproducing area and a reproduction-only area are formed by wobbling a groove formed in a spiral fashion to form a track to be tracked on a disk. The recording and reproducing area has address information recorded by wobbling of the groove and information recorded and reproduced by phase change marks on the track formed by the groove where the address information is recorded. The reproduction-only area has prerecorded information recorded by wobbling of the groove.
    Type: Application
    Filed: October 13, 2009
    Publication date: February 11, 2010
    Applicant: Sony Corporation
    Inventor: Shoei KOBAYASHI
  • Publication number: 20100034061
    Abstract: An optical storage apparatus includes an optical pickup head, a drive module, a spherical aberration compensator, and a controller module. The drive module is coupled to the optical pickup head for performing a predetermined operation associated with the optical pickup head. The spherical aberration compensator is coupled to the optical pickup head for performing a spherical aberration compensation upon the optical pickup head. The controller module is coupled to the drive module and the spherical aberration compensator for controlling the drive module to perform the predetermined operation during a first period of time and the spherical aberration compensator to perform the spherical aberration compensation during a second period of time. The first period of time overlaps the second period of time.
    Type: Application
    Filed: August 11, 2008
    Publication date: February 11, 2010
    Inventors: CHIH-CHING YU, Chao-Ming Huang, Yu-Chen Kuei
  • Publication number: 20100034066
    Abstract: A method for adjusting recording power of an optical disk apparatus having an output circuit that outputs recording light onto a test writing area of an optical disk, and a control circuit that adjusts the recording power of the recording light outputted from the output circuit, the method including the steps of causing the control circuit to erase a recording mark recorded onto the test writing area, to record a recording mark onto the test writing area in constant recording power lower than threshold power for starting a recording operation, and to record a recording mark onto the test writing area while changing the recording power.
    Type: Application
    Filed: May 12, 2009
    Publication date: February 11, 2010
    Inventors: TETSUYA FUSHIMI, ATSUSHI YAMADA, JINYA IKEDA
  • Publication number: 20100034070
    Abstract: To provide a reliable optical pickup device, a pickup case and an optical component including a lens are fixed by laser welding to increase the welding strength and reduce the positional displacement due to environmental changes. In a laser welded portion between a pickup case and an optical component including a lens, the optical component is provided with a joint portion having a convex protrusion at a portion to be joined to the pickup case. Laser beam irradiation is performed extending longer than the protrusion to form a thick welded portion at an end of the protrusion, in order to increase welding strength between the optical component and the pickup case.
    Type: Application
    Filed: April 10, 2009
    Publication date: February 11, 2010
    Inventors: Satoshi Arai, Hiroaki Furuichi, Mitsuo Satake
  • Publication number: 20100034067
    Abstract: Information is recorded on a multi-layered optical recording medium by irradiating it with a laser beam. The recording medium can form a first information recording layer that is the farthest from a light incident surface, a second information recording layer that is the second farthest from the light incident surface, and at least one third information recording layer that is located closer to the light incident surface than the second information recording layer is. At this time, if all the information recording layers other than the first information recording layer are either blank or have been completely recorded, then information is recorded on the first information recording layer. This allows for stabilizing the energy of a recording laser beam during recording and thereby providing improved recording quality.
    Type: Application
    Filed: March 10, 2008
    Publication date: February 11, 2010
    Inventors: Takashi Kikukawa, Koji Mishima
  • Publication number: 20100034062
    Abstract: A tracking apparatus for an optical information reproduction apparatus includes the following: a photoelectric detector (1) in which a far-field pattern of a light spot converged on a recording medium is formed across a divided light-receiving cell; an arithmetic unit (2) for outputting at least a pair of arithmetic signals from the output of the photoelectric detector (1); a phase comparator (4) for detecting a phase difference between the output signals of the arithmetic unit (2); an absolute value detector (8) for detecting an absolute value of the output signal of the phase comparator (4); a level detector (9) for generating a signal that indicates whether or not a convergence position of the light spot is located off an information track by detecting a predetermined number of times or more the output signal of the absolute value detector (8) has become larger than a predetermined value; a sensitivity detector (10) for detecting and outputting the sensitivity of the level detector (9) by observing the out
    Type: Application
    Filed: November 16, 2007
    Publication date: February 11, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Masayoshi Nakamura, Akihiko Nishioka, Yasuo Nakata
  • Publication number: 20100034072
    Abstract: A Fresnel member for an optical system is configured to receive at least reflected light having a first wavelength at a first envelope and reflected light having a second wavelength different from the first wavelength at a second envelope. The Fresnel member includes a plurality of ring zone portions having predetermined surface heights for achieving a maximum diffraction efficiency.
    Type: Application
    Filed: December 12, 2008
    Publication date: February 11, 2010
    Applicant: PANASONIC CORPORATION
    Inventor: Yosuke MIZUYAMA
  • Publication number: 20100034069
    Abstract: A method for controlling focus loop of an optical storage device includes: moving a lens of an optical pick-up head in a first moving direction; performing a focusing operation when a first S-curve sequence appears in a focus error signal; and when a light beam generated from the optical pick-up head is not focused on an optical disc, performing the focusing operation when a second S-curve sequence appears in the focus error signal; wherein the first S-curve sequence and the second S-curve sequence appear in the focus error signal during one revolution of the optical disc.
    Type: Application
    Filed: August 8, 2008
    Publication date: February 11, 2010
    Inventors: Chih-Ching Yu, Yu-Chun Lin
  • Publication number: 20100027405
    Abstract: An optical pickup apparatus is provided with an angle adjusting element. The angle adjusting element changes a propagation direction of luminous fluxes of four luminous flux regions set about an optical axis of the laser light, out of laser light reflected by a disc, and mutually disperses the luminous fluxes. A signal light region in which signal light only is present appears on a detecting surface of a photodetector. A sensor pattern for signal light is placed at a position irradiated with the signal light within this region. A sensor pattern for a spherical aberration detection is placed on an inner side of this region.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 4, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kenji Nagatomi, Katsutoshi Hibino, Seiichiro Takahashi
  • Publication number: 20100027398
    Abstract: There is provided an optical disc device which can evaluate in a short time as to whether an optical disc is recorded with satisfying the standard or not. An optical disc device for measuring a recording deviation amount of data recorded on an optical disc on which physical addresses are previously provided, includes an address detection circuit which detects the physical address and outputs a physical address detection signal, a timer which is operated in synchronization with reproduced data from the optical disc, a recording deviation amount measurement circuit which measures the recording deviation amount of data recorded on the optical disc by using the physical address detection signal and the count value of the timer, a memory which stores the measured recording deviation amount, and a data transfer circuit which transfers the recording deviation amount to the memory.
    Type: Application
    Filed: December 20, 2007
    Publication date: February 4, 2010
    Inventors: Takahiro Ichikura, Hideo Sakon, Yorikazu Takao, Daigo Senoo, Youichi Ogura
  • Publication number: 20100027404
    Abstract: An optical pickup apparatus includes an astigmatic element, an angle adjusting element for contradicting propagation directions of luminous fluxes within four different luminous flux regions out of a reflected light, a polarization adjusting element. Two of the luminous flux regions are placed in a direction in which aligned are a set of opposite angles made by the two mutually crossing straight lines respectively parallel to a first convergence direction and a second convergence direction vertical to the first convergence direction by the astigmatic element, and the remaining two luminous flux regions are placed in a direction in which an alternate set of opposite angles are aligned. The polarization adjusting element differentiates polarization directions of luminous fluxes which are selected out of the luminous fluxes within the four luminous flux regions and which are adjacent in a peripheral direction in which the optical axis of reflected light serves as an axis.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 4, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kenji Nagatomi, Katsutoshi Hibino
  • Publication number: 20100027384
    Abstract: A diffractive optical element generates main and two sub beams from an output light of a light source. An objective lens focuses the main and two sub beams on an optical recording medium. An optical detector receives the main and two sub beams reflected by the optical recording medium. The diffractive optical element is divided into six regions having different optical characteristics by a tangential direction division line corresponding to the tangential direction of the optical recording medium, first and second radial direction division lines corresponding to the radial direction thereof. A light in the first sub beam passing an intersection of the first radial and tangential direction division lines passes a region near the center of the objective lens. A light in the second sub beam passing an intersection of the second radial and the tangential direction division lines passes a region near the center of the objective lens.
    Type: Application
    Filed: September 3, 2007
    Publication date: February 4, 2010
    Inventor: Ryuichi Katayama
  • Publication number: 20100027395
    Abstract: An optical disk device which quickly detects that a transparent disk is loaded is provided. When an optical disk is loaded, a drive controller of an optical disk device drives a spindle motor and checks existence of an optical disk based on a driving result. In addition, the drive controller drives an optical pickup to apply a focus control, to detect whether or not focusing is possible. When it is determined from the driving result that there is an optical disk and that focus is not possible, the drive controller judges that the optical disk (D) is a transparent disk.
    Type: Application
    Filed: July 31, 2009
    Publication date: February 4, 2010
    Applicant: TEAC CORPORATION
    Inventor: Tatsuya Murata
  • Publication number: 20100027385
    Abstract: An aberration correcting device includes: a first transparent electrode; a second transparent electrode; and a liquid crystal layer disposed between the first transparent electrode and the second transparent electrode, having refractive index varying according to an electric field applied to the liquid crystal layer, wherein the first transparent electrode has a first circular dividing line and a second circular dividing line formed outside the first circular division line arranged to be concentric with the second circular dividing line, and wherein a region between the first circular dividing line and the second circular dividing line is radially divided by plural radial dividing lines.
    Type: Application
    Filed: June 26, 2009
    Publication date: February 4, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Kazuhiro Nagata, Katsuo Iwata
  • Publication number: 20100027392
    Abstract: An apparatus for calibrating an optical storage device includes a clock generator, a jitter meter, and a calculation unit. The clock generator is utilized for providing a clock signal; the jitter meter is utilized for obtaining a plurality of data-to-data jitter values of a plurality of radio frequency (RF) signals according to the clock signal; and the calculation unit is utilized for determining a minimum jitter value among the plurality of data-to-data jitter values.
    Type: Application
    Filed: August 4, 2008
    Publication date: February 4, 2010
    Inventors: Gwo-Huei Wu, Yi-Chen Tseng
  • Publication number: 20100027386
    Abstract: An optical pickup apparatus is provided with an angle adjusting element. The angle adjusting element changes a propagation direction of luminous fluxes of four luminous flux regions set about an optical axis of the laser light, out of laser light reflected by a disc, and mutually disperses the luminous fluxes. A signal light region in which signal light only is present appears on a detecting surface of a photodetector. A sensor pattern for signal light is placed at a position irradiated with the signal light within this region. A sensor pattern for a coma aberration detection is placed on an inner side of this region.
    Type: Application
    Filed: July 30, 2009
    Publication date: February 4, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kenji Nagatomi, Katsutoshi Hibino
  • Publication number: 20100027401
    Abstract: Holographic recording drives encode data for recording into a holographic medium. The steps comprise run length limited encoding three bytes of data into 5×5 matrix information, the data subject to a 4-byte error correction code; and providing the 5×5 matrix information to a spatial light modulator (SLM), as a portion of a two-dimensional pixel matrix of the spatial light modulator, for recording into a holographic image on the holographic medium.
    Type: Application
    Filed: September 22, 2006
    Publication date: February 4, 2010
    Inventors: ALLEN KEITH BATES, Nils Haustein, Craig Anthony Klein, Henry Zheng Liu, Daniel James Winarski
  • Publication number: 20100027402
    Abstract: An optical head device includes: a diffraction unit including a plurality of diffraction portions each diffracting a incident light in a given direction, the light beam being reflected by an optical disc; and a photodetection unit including a plurality of photodetectors each outputting a signal corresponding to an intensity of an irradiated light, wherein the photodetectors include at least two first photodetectors for generating a compensation value to compensate a tracking error signal, and wherein the diffraction portions include at least two first portions for focusing the incident light into the first photodetectors.
    Type: Application
    Filed: June 19, 2009
    Publication date: February 4, 2010
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Katsuo IWATA, Kazuhiro NAGATA
  • Publication number: 20100027393
    Abstract: An optical recording medium, comprising a dye recording layer, wherein a recording mark portion is formed at the dye recording layer by use of a laser light having a wavelength of 640 nm to 680 nm, and a reflectance after recording with respect to the laser light at the recording mark portion is increased compared to a reflectance before recording.
    Type: Application
    Filed: March 12, 2008
    Publication date: February 4, 2010
    Inventors: Tohru Yashiro, Yuki Nakamura, Masahiro Hayashi, Ippei Matsumoto
  • Publication number: 20100020672
    Abstract: An objective lens used for an optical information recording/reproducing apparatus for an optical disc based on a predetermined standard is made of resin and has a numerical aperture larger than or equal to 0.75. When f (unit: mm) represents a focal length at a wavelength ? (unit: nm), d (unit: mm) represents a thickness, and n represents a refractive index of the objective lens at the wavelength ?, the objective lens satisfies following conditions: 1.00<f<1.50 ??(1) 1.55<d·n/f<1.82 ??(2). At least a light source side surface of the objective lens is an aspherical surface. The objective lens satisfies a following condition: 2.80<(SAG1)?MAX·n<4.10 ??(3), where (SAG1)?MAX represents a maximum gradient of a gradient (SAG1)? of a sag amount SAG of the aspherical surface at the light source side within an effective beam diameter.
    Type: Application
    Filed: July 23, 2009
    Publication date: January 28, 2010
    Applicant: HOYA CORPORATION
    Inventors: Naoki YAMAGATA, Shuichi TAKEUCHI
  • Publication number: 20100020660
    Abstract: An information recording apparatus (1) comprises a recording means (11) for recording a data pattern on a recording medium (100), a reading means (11) for reading the data pattern to acquire a read signal, adding means (23, 24) for adding an offset signal to the read signal to acquire an offset-added signal, a measurement means (19) for measuring the jitter of the offset-added signal, and an adjustment means (21) for adjusting a recording condition so that the jitter satisfies a desired condition
    Type: Application
    Filed: February 13, 2007
    Publication date: January 28, 2010
    Applicant: PIONEER CORPORATION
    Inventors: Hiroyuki Uchino, Shogo Miyanabe, Yoshio Sasaki
  • Publication number: 20100020670
    Abstract: An optical pickup device and an optical recording/reproduction device are provided that can suppress a tracking error signal offset generated in the boundary between an unrecorded area and a recorded area. A three-beam diffraction grating is divided into two areas. A division line that divides the diffraction grating into two areas has a step in the direction almost vertical to a groove period structure, and the part of the division line in the step has a staircase shape. The phase difference in the groove period structures between one area and the other area, separated by the division line, is about 180 degrees.
    Type: Application
    Filed: April 2, 2009
    Publication date: January 28, 2010
    Inventor: Kazuyoshi YAMAZAKI
  • Publication number: 20100020669
    Abstract: Systems and methods are provided for recovering data in a holographic memory system. One embodiment of these systems and methods uses homodyne detection to introduce a local oscillator beam into a reconstructed data beam of the recovered hologram. An image of the combined beam comprising the reconstructed data beam and local oscillator beam may be processed to obtain contrast level information for the pixels of the detected image. This contrast level information may then be used to obtain an increased contrast image of the recovered hologram, which may increase the SNR of the recovered data.
    Type: Application
    Filed: October 9, 2009
    Publication date: January 28, 2010
    Applicant: INPHASE TECHNOLOGIES, INC.
    Inventor: MARK R. AYRES
  • Publication number: 20100020651
    Abstract: Deterioration of error rate at reproduction time is prevented even if a photodetector with a poor characteristic is included. An optical pickup unit (3) is provided with 4 photodetectors. A controller (13) obtains an error correction result of a reproduced signal, which is reproduced based on an RF signal generated while changing combination of the 4 photodetectors at startup time, and determines a combination at reproduction time in accordance with the obtained error correction result, to be given to an RF amplifier unit (10). The controller (13) is provided with a counter that counts for a fixed time period the error correction result per combination of the photodetectors, a comparator that compares a count result of the counter with a threshold set in advance, and an output controller that judges whether or not to use a combination of the photodetectors based on a comparison result of the comparator and performs change control of the combination of the photodetectors, of which there is a plurality.
    Type: Application
    Filed: July 27, 2009
    Publication date: January 28, 2010
    Applicant: NEC ELECTRONICS CORPORATION
    Inventor: Isao Shime
  • Publication number: 20100020668
    Abstract: Provided is a recordable optical recording medium that comprises a substrate, a recording layer, and a reflective layer, wherein the recording layer and the reflective layer are formed on the substrate, the recording layer is formed of an inorganic material, and information is recorded on the recordable optical recording medium by use of an irreversible change at the recording layer caused by irradiating blue laser light.
    Type: Application
    Filed: July 27, 2007
    Publication date: January 28, 2010
    Applicant: Ricoh Company Ltd
    Inventors: Shinya Narumi, Katsuyuki Yamada, Noboru Sasa, Yoshitaka Hayashi, Toshishige Fujii, Masayuki Fujiwara, Masaki Kato, Takeshi Kibe, Takuya Kohda, Hiroshi Miura
  • Publication number: 20100014403
    Abstract: A method for discriminating different types of optical discs includes the steps of focusing a beam spot generated by a laser source on an optical disc, and rotating the optical disc; generating a radio frequency signal and a corresponding first signal of the radio frequency signal; comparing a peak-to-peak value of the corresponding first signal with a predetermined value; determining the optical disc as a high density optical disc when the peak-to-peak value of the first signal is smaller than the predetermined value; and, determining the optical disc as a low density optical disc when the peak-to-peak value of the first signal is greater than the predetermined value.
    Type: Application
    Filed: June 3, 2009
    Publication date: January 21, 2010
    Applicant: SUNPLUS TECHNOLOGY CO., LTD.
    Inventor: WEI-WU LIU
  • Publication number: 20100014393
    Abstract: A high-density recording medium including a first surface and a second surface, the second surface being a light incident surface at a normal mounting condition, a clamping area, an information area including a recording layer provided adjacent to the second surface, a transition area extending between the clamping area and the information area, the transition area being defined from an end position of the clamping area to a beginning of the information area, and a slope being formed in the transition area on the first surface. Further, the slope is formed from the end position of the clamping area to a position placed at least a predetermined distance ahead of the start position of the information area, and a gap as a non-slanted area extends between the information area and a closer end of the slope thereto.
    Type: Application
    Filed: September 24, 2009
    Publication date: January 21, 2010
    Inventors: Jin Yong KIM, Kyung Chan Park
  • Publication number: 20100014409
    Abstract: A holographic data storing method includes the steps of: encoding original data to generate holographic data according to a codeword to symbol relation; and recording a hologram corresponding to the holographic data onto a holographic storage medium. In the codeword to symbol relation, a plurality of sample symbols corresponds to a plurality of codewords. Each of the sample symbols corresponds to a pattern having N*N pixels. There are M bright pixels in the N*N pixels, wherein N and M are positive integers and M is smaller than N*N. A hamming distance of the sample symbols is greater than or equal to 4, and a two-dimensional run-length of the sample symbols is greater than or equal to 2.
    Type: Application
    Filed: March 10, 2009
    Publication date: January 21, 2010
    Applicant: INDUSTRIAL TECHNOLOGY RESEARCH INSTITUTE
    Inventors: Chien-Fu Tseng, Po-Chang Chen, Feng-Hsiang Lo, Jenn-Hwan Tarng
  • Publication number: 20100014407
    Abstract: In an optical information recording medium (1), a light-transmitting layer (10) or a transparent substrate, an information recording layer (20), and a substrate (30) are stacked in this order from a side from which reproducing light (2) enters. The information recording layer (20) includes at least a reproducing film (21) whose complex refractive index at a light source wavelength (?) of the reproducing light (2) is changed by heat. The relationship of 0.67×(?/NA)>TP>0.04×(?/NA) is satisfied, where TP is a track pitch of prepits (31) formed on the substrate (30), and NA is a numerical aperture of an objective lens (55) for converging the reproducing light (2) on the optical information recording medium.
    Type: Application
    Filed: July 24, 2007
    Publication date: January 21, 2010
    Inventors: Masaki Yamamoto, Hirohisa Yamada, Toshihiko Sakai, Yasuhiro Harada, Go Mori, Hideharu Tajima, Masanori Shimo, Nobuyuki Takamori
  • Publication number: 20100014410
    Abstract: An optical pickup includes: a light source that emits a light beam; an object lens that condenses the light beam on a target recording layer of an optical disk; a lens moving unit; a condensing lens; a hologram element that diffracts, in diffracting a reflected light beam and separating it into reflected zeroth-order and first-order light beams, parts of the reflected first-order light beam in a first direction and sets them as first and second beams, diffracts parts of the reflected first-order light beam in a second direction and sets them as third and fourth beams; and a photodetector that receives the first and second beams and the third and fourth beams and generates light reception signals, and receives interlayer stray light of a part of the light beam reflected by the other recording layers other than the target recording layer and generates a stray light reception signal.
    Type: Application
    Filed: July 13, 2009
    Publication date: January 21, 2010
    Applicant: Sony Corporation
    Inventors: Takashi NAKAO, Fumiaki NAKANO, Noriaki NISHI, Nobuhiko ANDO, Hiroaki NAKAGAWA, Yutaka TENTAKU
  • Publication number: 20100014398
    Abstract: The present invention provides a method of recording identification information in an optical disc, by which specified disc identification information can be uniformly applicable to efficiently cope with the recording/reproducing of the optical disc. The present invention includes the step of recording disc identification information in a management area of the optical disc wherein the disc identification information identifies a disc type identified according to a disc thickness.
    Type: Application
    Filed: July 1, 2009
    Publication date: January 21, 2010
    Inventor: Jin Yong Kim
  • Publication number: 20100014405
    Abstract: A most probable path is selected from a number n (where n?2) of paths of state transitions occurring from a first state Sk?j (where k?3 and j?2) at a time k?j into a second state Sk at a time k. The method includes the steps of detecting predetermined combinations of the first and second states Sk?j and Sk defining the n probable paths in a predetermined period j between the times k?j and k, and evaluating the reliability of a read signal, decoded in the period j, by |Pa?Pb|. Pa and Pb indicate the probabilities of state transition of first and second state transition paths in the period j. The first and second state transition paths are estimated to be the most probable and the second most probable, respectively, among the n probable paths defined by the combinations detected.
    Type: Application
    Filed: July 28, 2009
    Publication date: January 21, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Takeshi NAKAJIMA, Harumitsu MIYASHITA, Hiromichi ISHIBASHI, Shigeru FURUMIYA
  • Publication number: 20100014408
    Abstract: A BCA mark is applied prior to molding of optical recording media. A stamper including a BCA code is formed. The stamper including the BCA code is used in the molding of optical recording discs. This technique can be used in manufacturing of read-only type discs, recordable discs, rewritable discs, hybrid discs, discs readable from both disc sides, discs having multiple information layers, high-density discs, etc.
    Type: Application
    Filed: September 28, 2009
    Publication date: January 21, 2010
    Applicant: CINRAM INTERNATIONAL, INC.
    Inventors: James J. MUSTO, James MYRTLE
  • Publication number: 20100014411
    Abstract: A pickup device includes a diffraction grating 12 for separating a light beam emitted from the light source into at least three light beams. The diffraction grating 12 is divided into four regions by straight lines extending in a direction parallel to a tangential direction of tracks of an optical information recording medium. A periodic structure of a second region 12B has a phase difference of approximately 180 degrees from a periodic structure of a third region 12C, and a periodic structure of a first region 12A has a phase difference of approximately 180 degrees from a periodic structure of a fourth region 12D.
    Type: Application
    Filed: September 6, 2007
    Publication date: January 21, 2010
    Applicant: PANASONIC CORPORATION
    Inventors: Takuya Okuda, Hiroaki Yamamoto, Naoki Nakanishi, Masahiko Nishimoto, Naoto Shimada
  • Publication number: 20100014400
    Abstract: A recording device (200) includes a first recording layer (L0 layer) and a second recording layer (L1 layer) where recording information is recorded by irradiation of a laser beam (LB). Each of the first recording layer and the second recording layer includes: recording means (352) for recording the recording information on a recording medium (100) having a buffer area (102, 109, 118, 119) for preventing erroneous operation and a calibration area (103a, 103b, 113, 113b) for calibrating laser beam power or on a recording medium having a calibration area; setting means (354) for setting a reserved area of a predetermined size for extending or generating a buffer area for each recording unit of the calibration area; calibration means (354) for controlling the recording means so that the recording information is recorded in the reserved area.
    Type: Application
    Filed: January 13, 2006
    Publication date: January 21, 2010
    Inventors: Masayoshi Yoshida, Masahiro Kato, Tsuyoshi Hasebe, Takeshi Koda, Keiji Katata
  • Publication number: 20100008206
    Abstract: Provided are a method and apparatus for recording/reproducing holographic information. The apparatus for recording/reproducing holographic information includes an optical pickup which irradiates light on a holographic information storage medium and receives irradiated light, wherein the optical pickup comprises a focusing optical system having a numerical aperture (NA) during recording that is lower than the NA during reproduction.
    Type: Application
    Filed: July 13, 2009
    Publication date: January 14, 2010
    Applicant: Samsung Electronics Co., Ltd.
    Inventor: Taek-seong Jeong
  • Publication number: 20100008202
    Abstract: An optical information recording apparatus includes a recording layer, wherein nanoparticles having diameters of 100 nm or less are disposed while being surrounded by a medium having a complex dielectric constant which is changed in accordance with an application of light and the degree of local plasmon resonance produced by the nanoparticles is changed in accordance with the change in the complex dielectric constant of the medium.
    Type: Application
    Filed: July 9, 2009
    Publication date: January 14, 2010
    Applicant: SONY CORPORATION
    Inventor: Naoto Kojima
  • Publication number: 20100008196
    Abstract: In optical disc systems, read-out is hampered because of spherical aberrations resulting from cover layer thickness variations or because discs consists of multiple layers. The aberration correcting apparatus (1) of the present invention is arranged to correct such an optical aberration. Therefore, the aberration correcting apparatus (1) comprises a fluid chamber containing a first fluid and a second fluid having different indices of refraction. The first (5) and second fluid (6) are in contact over a meniscus (7) acting as a refractive surface, wherein the shape of the meniscus (7) can be influenced by a magnetic field generated by a magnetizing coil (20).
    Type: Application
    Filed: December 19, 2005
    Publication date: January 14, 2010
    Applicant: KONINKLIJKE PHILIPS ELECTRONICS, N.V.
    Inventors: Helmar Van Santen, Michael Adrianus Henricus Van Der AA
  • Publication number: 20100008197
    Abstract: An optical disk apparatus according to the present invention includes a spindle motor that rotates an optical disk on whose information recording surface a plurality of addresses is recorded, an optical pickup that records/reproduces an information signal on/from the information recording surface of the optical disk rotated by the spindle motor, an strobe light-emitting unit that irradiates a label surface of the optical disk with light, and a control unit that causes the strobe light-emitting unit to emit light based on an address selected from the plurality of addresses as a reference address and a reference signal readable from the optical disk.
    Type: Application
    Filed: June 23, 2009
    Publication date: January 14, 2010
    Applicant: SONY CORPORATION
    Inventors: Yuichiro IKEMOTO, Shintaro TANAKA, Koji ASHIZAKI
  • Publication number: 20100008195
    Abstract: An optical scanning device is adapted for scanning a record carrier having an outer face. The optical scanning device comprises a radiation source for generating a radiation beam, and an objective system having an exit face arranged for evanescent coupling of the radiation beam between the exit face and the outer face and for converging the radiation beam to a focus. A gap servo maintains a distance between the exit face and the outer face at a predetermined gap height. The optical scanning device includes a control unit for setting the predetermined gap height at at least two different values.
    Type: Application
    Filed: July 9, 2009
    Publication date: January 14, 2010
    Inventor: Johannes Leopoldus Bakx
  • Publication number: 20100008203
    Abstract: A semiconductor element is mounted on a rectangular base of a package including the base and ribs provided on a pair of opposite external edges of the base. Electrode pads of the semiconductor element and connection electrodes provided on rib upper surfaces are connected to each other by metal wires. On the rib upper surfaces, spacers are provided at locations closer to the outside than the connection electrodes. A transparent lid adheres to the upper surfaces of the spacers to cover the entire surface of the package. The height of the spacers is greater than the diameter of the metal wires.
    Type: Application
    Filed: March 10, 2008
    Publication date: January 14, 2010
    Inventors: Junya Furuyashiki, Syouzou Moribe, Hiroki Utatsu, Noriyuki Yoshikawa, Toshiyuki Fukuda, Masanori Minamio, Hiroyuki Ishida