With Discs [n0406] {g11b 7/0037} Patents (Class G9B/7.005)
  • Publication number: 20130081069
    Abstract: A stepping-motor-driving circuit for an optical pickup: includes a control-signal-generating circuit to generate a plurality of control signals for supplying driving currents to driving coils having a plurality of phases during energized periods, with a de-energized period therebetween; a plurality of output circuits to supply the currents to the respective coils, in response to the signals; an induced-voltage-detecting circuit to compare a voltage generated each in the coils with a threshold voltage during the de-energized period; a threshold-voltage-setting circuit; and a determining circuit to determine whether a collision state is present where the pickup reaches an end of a movement range, based on an induced-voltage-detecting-circuit-detection result, the threshold voltage set at a voltage between a voltage generated each in the coils during the de-energized period when the stepping motor stops or rotates in the state, and a voltage generated therein in the de-energized period when no collision state is
    Type: Application
    Filed: September 28, 2012
    Publication date: March 28, 2013
    Inventors: Hiroaki Kawakami, Masashi Tanabe
  • Publication number: 20120236695
    Abstract: The optical disk device can stably control an aberration correction lens even when one end of a movable range of the aberration correction lens is set as a reference position. The optical disk device comprises an optical pickup unit including the aberration correction lens and a stepping motor for moving the aberration correction lens, wherein, when an optical disk is inserted into the optical disk device, the aberration correction lens is moved to the reference position within the movable range and near one end thereof, and wherein, when moving the aberration correction lens to the reference position, driving pulses are applied to the stepping motor to press the aberration correction lens against the one end of the movable range, and thereafter a predetermined number of pulses are applied to reversely rotate the stepping motor and to set a stop position where the aberration correction lens stops as the reference position.
    Type: Application
    Filed: March 13, 2012
    Publication date: September 20, 2012
    Inventor: Tomomi OKAMOTO
  • Publication number: 20120176872
    Abstract: An optical media player is described that submits identifying information from an optical disc to network media servers in order to stream related music through the media player upon completion of the music on the optical disc.
    Type: Application
    Filed: June 6, 2011
    Publication date: July 12, 2012
    Applicant: BBY SOLUTIONS, INC.
    Inventor: Nigel Waites
  • Publication number: 20120134251
    Abstract: A method for servoing when reading out a recorded holographic disk or recording in a preformatted holographic disk is disclosed. The method includes detecting a primary signal of a reflected primary beam from a target data track of a target data layer of the holographic disk, wherein the primary beam of radiation has a first wavelength. The method also includes comparing a power measurement of the primary signal with a threshold value of power. The method also includes detecting a tracking signal of a reflected tracking beam from a reference layer of the holographic disk in an event that the power measurement of the primary signal is below the threshold value of power, wherein the tracking beam of radiation has a second wavelength. The method also includes generating a servo error signal based upon the primary signal or the tracking signal.
    Type: Application
    Filed: November 30, 2010
    Publication date: May 31, 2012
    Applicant: GENERAL ELECTRIC COMPANY
    Inventors: Zhiyuan Ren, Xiaolei Shi, Xuefeng Wang
  • Publication number: 20120087223
    Abstract: The invention relates to a method of writing data to a disc (OD). The method comprised: a) performing a plurality of writing actions in which a plurality of data portions are written to the disc, b) performing a plurality of verification actions in which written data portions are at least partly verified and at least part of the data portions are replaced if needed. The method further comprises a2) performing a decision action for each writing action in which a decision whether or not to perform the verification action for a specific written data portion is taken.
    Type: Application
    Filed: December 15, 2011
    Publication date: April 12, 2012
    Applicant: LITE-ON IT CORP.
    Inventors: Marc Angeline Jozef Cas, Johannes Franciscus Petrus Claas, Stefan Geusens
  • Publication number: 20120075983
    Abstract: An information recording medium includes a first information recording layer and a second information recording layer. The first information recording layer is formed at a laser beam entrance surface, and is configured so that information can be recorded thereupon and/or reproduced therefrom using a first objective lens having a numerical aperture NA1 and laser beam of a wavelength ?1. The second information recording layer is formed so as to have a distance to the laser beam entrance surface of 0.05 mm to 1.2 mm and is configured so that information can be recorded thereupon and/or reproduced therefrom using a second objective lens having a numerical aperture NA2 and laser beam of a wavelength ?2. When a diffraction limit ?2, determined by numerical aperture NA2 and wavelength ?2, is taken as ?2=0.61×?2/NA2, a track pitch Tp1 of a track formed on the first information recording layer is Tp1<?2.
    Type: Application
    Filed: September 23, 2011
    Publication date: March 29, 2012
    Inventors: Fumitomo Yamasaki, Kanji Wakabayashi, Yoshiaki Komma, Toshiyasu Tanaka
  • Publication number: 20120026854
    Abstract: An optical recording medium including a plurality of recording layers to record/reproduce information using light with a predetermined wavelength, the information being recorded on one of the recording layers using a mark and a space, wherein a channel clock period T is provided for recording the mark on one of the recording layers. A plurality of pulses, including a last pulse arranged at an end of the pulses, are used to record the mark with length 3T, the mark being recorded with a condition that a width of the last pulse is minimum OT and maximum 1.10T, in which a first subsequent level lower than a peak power level of the last pulse is arranged next to the last pulse, and a second subsequent level lower than the peak power level but higher than the first subsequent level is arranged next to the first subsequent level.
    Type: Application
    Filed: October 4, 2011
    Publication date: February 2, 2012
    Inventors: Kazuyo UMEZAWA, Seiji Morita, Koji Takazawa, Naomasa Nakamura, Naoki Morishita, Shinichi Katsuda
  • Publication number: 20120002517
    Abstract: An optical disc includes a reflective film formed on concave and convex marks after the concave and convex marks are synchronized with the integral multiple of a channel bit length and formed in accordance with modulated main information. Thereafter, continuous or intermittent laser light synchronized with the integral multiple of the channel bit length is irradiated at intervals longer than the longest one of the concave and convex marks in accordance with a spiral track formed in a circumferential direction of the concave and convex marks, whereby an optical characteristic of the reflective film is changed to form a recordable mark and sub-information necessary to reproduce the main information is recorded in a superimposition manner.
    Type: Application
    Filed: September 13, 2011
    Publication date: January 5, 2012
    Inventors: MASARU YAMAOKA, Mamoru Shoji, Keiji Nishikiori, Makoto Usui, Mitsuro Moriya
  • Publication number: 20110235484
    Abstract: In one example embodiment, a recording apparatus includes a laser and a controller. In one example embodiment, the recording apparatus records a second recording track on a recording medium which includes a first recording track which was previously recorded on the recording medium. In one example embodiment, the second recording track is gradually enlarged until a first separation distance exceeds a distance which corresponds to at least twice a number of maximum deviation tracks of the first recording track.
    Type: Application
    Filed: March 3, 2011
    Publication date: September 29, 2011
    Applicant: Sony Corporation
    Inventor: Junichi Horigome
  • Publication number: 20110228655
    Abstract: The disclosure discloses a compensation method in a radial direction on a label side of an optical disc. An optical disc is inserted into an optical disk drive. The data side of the optical disc is divided into at least one compensation area. An optical pick-up head (OPU) is moved from inner to outer rings by simulating a writing process. The OPU is moved to some pre-determined points and radial-directional compensation is performed to obtain radial-directional voltage gains at the pre-determined points. The voltage gains are recorded. The label side of an optical disc is inserted into the optical disk drive. The simulated track number is calculated on the basis of the required moving distance for the OPU to write pattern on the label side. The OPU is moved to write the label side by a radial-directional lens driving voltage compensated with a gain obtained from a compensation formula.
    Type: Application
    Filed: December 28, 2010
    Publication date: September 22, 2011
    Applicant: QUANTA STORAGE INC.
    Inventors: Chi-Hsiang Kuo, Chun-Wen Lai, Shih-Jung Huang
  • Publication number: 20110222382
    Abstract: An optical disc drive and optical disc reading method according to the present invention is designed to perform a read operation with good stability even on a slim disc that could produce a significant axial runout. For that purpose, the optical disc drive determines, by the time it has taken for the number of revolutions of a motor that rotates the optical disc loaded to reach a predetermined number, whether the disc loaded is a lightweight disc or not (in Step 202). The drive also determines, by a signal obtained from the optical disc, what the size of the optical disc loaded is (in Step 204). And if the drive decides, based on results of these processing steps, that the disc loaded is a slim disc, then the drive increases the number of revolutions of the optical disc to a predetermined number or more in Step 207 to minimize the influence of axial runout.
    Type: Application
    Filed: March 7, 2011
    Publication date: September 15, 2011
    Inventors: Takahiro SATO, Akihito YOSHIMI, Takeshi SHIMAMOTO, Hiroshi YOSHIDA
  • Publication number: 20110170394
    Abstract: An object of the invention is to improve the quality of a servo signal and a reproduction signal. Shape-wise thicknesses tr1, tr2, . . . , and trN of a cover layer and first through (N?1)-th intermediate layers of an optical recording medium having refractive indexes nr1, nr2, . . . , and nrN are converted into thicknesses t1, t2, . . . , and tN of the respective layers having a predetermined refractive index “no” which makes a divergent amount equal to a divergent amount of a light beam resulting from the thicknesses tr1, tr2, . . . , and trN, a difference DFF between the sum of a thickness “ti” through a thickness “tj”, and the sum of a thickness “tk” through a thickness “tm” is set to 1 ?m or more (where i, j, k, and m are each any positive integer satisfying i?j<k?m?N), and the thicknesses t1, t2, . . . , and tN are calculated by products of a function f(n) expressed by the following formula (1), and the thicknesses tr1, tr2, . . . , and trN: f(n)=?1.088n3+6.1027n2?12.042n+9.
    Type: Application
    Filed: April 14, 2010
    Publication date: July 14, 2011
    Inventors: Yoshiaki Komma, Joji Anzai, Masahiko Tsukuda, Yasumori Hino
  • Publication number: 20100172228
    Abstract: The present invention makes it possible to use an optical pickup in common with conventional optical disks. In a three-dimensional mark recording layer (111v) of a voluminal medium (100v), information is recorded by forming a three-dimensional record mark (RM) in the vicinity of the focus (Fb) of a blue light beam (Lb) according to the blue light beam (Lb) that is concentrated and has a light intensity equal to or larger than a predetermined intensity. The information is reproduced from the three-dimensional mark recording layer (111v) on the basis of a reproducing blue light beam (Lbr) deriving from irradiation of the blue light beam (Lb). A servo layer (114v) of the voluminal medium (100v) reflects at least part of the red light beam (Lr) which is irradiated in order to square the position of the blue light beam (Lb) in the three-dimensional mark recording layer (111v) with an arbitrary target mark position and whose wavelength is different from that of the blue light beam (Lb).
    Type: Application
    Filed: April 2, 2009
    Publication date: July 8, 2010
    Applicant: Sony Corporation
    Inventors: Kimihiro Saito, Hisayuki Yamatsu
  • Publication number: 20100002555
    Abstract: A method is presented for use in determining a degree of quality of a multi-layer optical data carrier in its at least partially recorded state. Predetermined first data is provided being indicative of a qualified, at least partially recorded multi-layer optical data carrier. This data corresponds to an optical response obtainable from a specific data carrier under predetermined conditions of an optical scan of the rotating data carrier. A data carrier being qualified is scanned by at least one optical beam under said predetermined conditions of the scan, and a first control signal from the data carrier is detected and data indicative of the detected control signal is generated. The so generated data is processed to determine a relation with said predetermined data. The determined relation is used for determining a degree of quality of said scanned data carrier.
    Type: Application
    Filed: December 31, 2007
    Publication date: January 7, 2010
    Applicant: MEMPILE INC.
    Inventor: Yair Salomon
  • Publication number: 20090303860
    Abstract: A disk-layer-configuration judging unit (180) of a recording-and-reproducing apparatus (100) judges which of a one-layer disk (10) and a two-layer disk (20) is a disk in which content data is to be recorded. A system controller (280) sets a recording rate to be a conventional recording rate when the disk-layer-configuration judging unit (180) judges that the disk is the one-layer disk (10) while setting the recording rate to be a recording rate that makes the maximum recordable time twice as much as the maximum recordable time of the one-layer disk (10) when the disk-layer-configuration judging unit (180) judges that the disk is the two-layer disk (20).
    Type: Application
    Filed: May 29, 2006
    Publication date: December 10, 2009
    Applicant: Pioneer Corporation
    Inventors: Akira Takahashi, Yasuyuki Umehara, Takashi Hora