Patents by Inventor Friedhelm Zucker

Friedhelm Zucker has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 7848195
    Abstract: The invention relates to a method for transmitting a write strategy to a laser driver, and to a pickup and an apparatus for writing to or reading from and writing to optical recording media using such method. According to the invention, the method has the steps of: transmitting an encrypted write strategy to the laser driver; and decrypting the transmitted write strategy with a decryption key stored in a first memory of the laser driver.
    Type: Grant
    Filed: October 10, 2006
    Date of Patent: December 7, 2010
    Assignee: Thomson Licensing
    Inventor: Friedhelm Zucker
  • Patent number: 7466636
    Abstract: In order to obtain a corrected or compensated focus error signal or track error signal, it is proposed to generate primary and secondary scanning beams incident on adjacent tracks of an optical recording medium and to detect the primary and secondary scanning beams reflected from the optical recording medium in order to derive from them primary-beam and secondary-beam focus error signals or primary-beam and secondary-beam track error signals, which are subsequently normalized in order to obtain the compensated focus error signal or track error signal from the normalized primary-beam and secondary-beam error signals by means of weighted combinations. As a result of the normalization, the corrected or compensated focus error signal or track error signal is generated independently of the reflection properties of the respectively scanned track.
    Type: Grant
    Filed: August 14, 2001
    Date of Patent: December 16, 2008
    Assignee: Thomson Licensing
    Inventors: Christian Büchler, Friedhelm Zucker
  • Patent number: 7423563
    Abstract: The invention relates to a serial data transfer in a numerically controlled control system to update an output value of the control system. A variable write depth shift register is used to update an output value of the control system in such a way that only a number of bits of a data word, which has to be updated to form the updated output value via a serial data transfer is transferred to the variable write depth shift register, so that the output value is updated in a shorter time and can be updated more frequently. The variable write depth shift register is applicable in a numerically controlled control system in which long data words and shift register are used to update the output value via serial data transfer.
    Type: Grant
    Filed: December 19, 2006
    Date of Patent: September 9, 2008
    Assignee: Thomson Licensing
    Inventor: Friedhelm Zucker
  • Patent number: 7277363
    Abstract: A magneto-optical recording or reproducing device having an information erasing means for erasing information or data recorded on a magneto-optical recording medium. According to the invention, the information erasing means comprises an erasing magnet having a field strength sufficient to initialize the magneto-optical recording medium without the assistance of a laser and/or an optical scanning device.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: October 2, 2007
    Assignee: Thomson Licensing
    Inventor: Friedhelm Zucker
  • Publication number: 20070162155
    Abstract: The invention relates to a serial data transfer in a numerically controlled control system to update an output value of the control system. A variable write depth shift register is used to update an output value of the control system in such a way that only a number of bits of a data word, which has to be updated to form the updated output value via a serial data transfer is transferred to the variable write depth shift register, so that the output value is updated in a shorter time and can be updated more frequently. The variable write depth shift register is applicable in a numerically controlled control system in which long data words and shift register are used to update the output value via serial data transfer.
    Type: Application
    Filed: December 19, 2006
    Publication date: July 12, 2007
    Inventor: Friedhelm Zucker
  • Publication number: 20070140596
    Abstract: The invention relates to a compatible optical scanner with an improved laser modulator for recording or reproduction apparatuses of optical recording media. Although the input characteristic curves of older and newer optical scanners fundamentally differ on account of different modulator circuits, a circuit arrangement for an optical scanner with an improved laser modulator is specified which is completely compatible with previously used optical scanners. The compatible scanner with an improved laser modulator, which is a laser modulator that at least partly or completely switches the laser current, has, at its input, a means for simulating the input characteristic curve of a laser, which means is formed for example by series?connected diodes D1 . . . Dn or a zener diode that interacts with a current mirror at the input of the optical scanner.
    Type: Application
    Filed: November 26, 2004
    Publication date: June 21, 2007
    Applicant: THOMSON LICENSING
    Inventor: Friedhelm Zucker
  • Publication number: 20070104056
    Abstract: The invention relates to a method for transmitting a write strategy to a laser driver, and to a pickup and an apparatus for writing to or reading from and writing to optical recording media using such method. According to the invention, the method has the steps of: transmitting an encrypted write strategy to the laser driver; and decrypting the transmitted write strategy with a decryption key stored in a first memory of the laser driver.
    Type: Application
    Filed: October 10, 2006
    Publication date: May 10, 2007
    Inventor: Friedhelm Zucker
  • Publication number: 20050201252
    Abstract: The invention relates to an intrinsically safe pick-up for reproduction or recording devices for different optical recording media, which have at least two lasers with a monitor diode which is used jointly for the lasers, such as a monitor diode which is integrated in a twin laser. The intrinsically safe pick-up has a switching means, which is formed by interlocked switches, by means of which both a reference value, which is associated with one laser diode with the monitor diode, is produced in order to control the light power of the laser diode, while at the same time preventing simultaneous actuation of the laser diodes or incorrect association of a light power adjusting means leading to overloading or to destruction of the twin laser. A reproduction or recording device which is designed with an intrinsically safe pick-up for different optical recording media does not require any additional changeover switches, which would otherwise need to be provided between a DVD/CD circuit and the pick-up.
    Type: Application
    Filed: June 16, 2003
    Publication date: September 15, 2005
    Inventor: Friedhelm Zucker
  • Patent number: 6781948
    Abstract: The present invention relates to a device for reading from and/or writing to optical recording media having a scanning unit, which is equipped with at least two detector units each having a plurality of detector elements, and also an evaluation unit, each of the detector elements being connected to the evaluation unit by means of a line. The object of the present invention is to simplify the structure of a device of this type. This object is achieved by virtue of the fact that detector elements of different detector units are each connected to the evaluation unit via a single line. The device according to the invention is advantageously a device which can read from and/or write to not only optical recording media which correspond to a CD standard but also those which correspond to a DVD standard.
    Type: Grant
    Filed: October 2, 2001
    Date of Patent: August 24, 2004
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Christian Büchler, Lieu-Kim Dang, Friedhelm Zucker
  • Publication number: 20040100841
    Abstract: In order to obtain a corrected or compensated focus error signal or track error signal, it is proposed to generate primary and secondary scanning beams incident on adjacent tracks of an optical recording medium and to detect the primary and secondary scanning beams reflected from the optical recording medium in order to derive from them primary-beam and secondary-beam focus error signals or primary-beam and secondary-beam track error signals, which are subsequently normalized in order to obtain the compensated focus error signal or track error signal from the normalized primary-beam and secondary-beam error signals by means of weighted combinations. As a result of the normalization, the corrected or compensated focus error signal or track error signal is generated independently of the reflection properties of the respectively scanned track.
    Type: Application
    Filed: February 24, 2003
    Publication date: May 27, 2004
    Inventors: Christian Bchler, Friedhelm Zucker
  • Patent number: 6742096
    Abstract: A method of accelerating the identification of the type of data carrier when the data carrier is inserted in a multimode player and/or recorder which accepts different types of data carriers Looking up a table of use statistics allows the present method to determine which data carrier type is most often used, thus most probable to be encountered, and to select a parameter or a set of parameters associated with this type to test the data carrier.
    Type: Grant
    Filed: July 1, 1999
    Date of Patent: May 25, 2004
    Assignee: Thomson Licensing S.A.
    Inventor: Friedhelm Zucker
  • Patent number: 6507549
    Abstract: A device for reading from and/or writing to optical recording media, the device comprising a light source for producing a scanning beam, a photodetector for detecting the scanning beam reflected by the recording medium and a semi-transparent mirror arranged in the beam path for directing the scanning beam onto the recording medium and the reflected scanning beam onto the photodetector. An object of the invention is to improve a device of this type, in particular with regard to reducing the production costs. This object is achieved by the semi-transparent mirror being a plane-parallel plate with a layered structure, and a partially reflective layer being arranged between two small carrier plates.
    Type: Grant
    Filed: December 12, 2000
    Date of Patent: January 14, 2003
    Assignee: Thomson Licensing S.A.
    Inventors: Yasuaki Morimoto, Friedhelm Zucker, Christian Büchler
  • Publication number: 20020009041
    Abstract: The present invention relates to a device for reading from and/or writing to optical recording media having a scanning unit, which is equipped with at least two detector units each having a plurality of detector elements, and also an evaluation unit, each of the detector elements being connected to the evaluation unit by means of a line.
    Type: Application
    Filed: October 2, 2001
    Publication date: January 24, 2002
    Inventors: Christian Buchler, Lieu-Kim Dang, Friedhelm Zucker
  • Patent number: 6285641
    Abstract: A device for writing to and/or reading from optical recording media having different structures is described, for example, a device which is suitable both for writing to/reading from digital videodisks (DVD) and conventional CD's. Provision is made for measuring the intensity of each peak in the mirror signal while the objective lens is moving to the recording medium. The intensity e.g. at the instant of the positive-negative crossing of the focus error signal is taken in this case. The type of optical recording medium is determined from the time characteristic and/or the height distribution of the peaks. In order to identify the type of optical recording medium, different properties of the optical recording medium are taken into account, such as reflectivity of the corresponding reflective surface, reduced intensity modulation due to spherical aberration, time characteristic and the like.
    Type: Grant
    Filed: September 3, 1998
    Date of Patent: September 4, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Lieu Kim Dang, Friedhelm Zucker, Heinz-Jörg Schroeder
  • Publication number: 20010006504
    Abstract: The present invention relates to a device for reading from and/or writing to optical recording media (6), which has a light source (1) for producing a scanning beam (2), a photodetector (7) for detecting the scanning beam (2) reflected by the recording medium (6) and a semi-transparent mirror (3) arranged in the beam path for directing the scanning beam (2) onto the recording medium (6) and the reflected scanning beam (2) onto the photodetector (7).
    Type: Application
    Filed: December 12, 2000
    Publication date: July 5, 2001
    Inventors: Yasuaki Morimoto, Friedhelm Zucker, Christian Buchler
  • Patent number: 6198706
    Abstract: The invention relates to a method and an arrangement for a compatible recording and/or reproduction device for the reproduction of information from, and/or for recording on, optical information carriers (CD) having differing information storage densities. A light source is used which is adapted to the highest storage density of the information carriers (CD) to be used as regards wavelength and light spot dimensions and the light directed onto the information carrier (CD) is defocused by a defocusing means for the enlargement of the light spot for information carriers (CD) of lower storage density.
    Type: Grant
    Filed: November 28, 1995
    Date of Patent: March 6, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventor: Friedhelm Zucker
  • Patent number: 6195318
    Abstract: Method for the correction of a tracking error signal during optical scanning of a recording medium in the form of a disc. In the case of MO discs, the Kerr rotation angle is in general very small, so that so-called enhancement is used for processing. This leads to birefringence effects which are thermally induced on the WO disc during the writing process producing a noise level on the track error signal. According to the invention, an optical scanner arrangement is used to determine light intensities from two mutually perpendicular polarization planes. A noise element, which is produced by interfering polarization rotation of the light, in the tracking error signal is compensated by linking the electrical output signals of the scanner arrangement. Applicable both to MO and WO as well as CD audio, CD video and CD-ROM.
    Type: Grant
    Filed: December 8, 1998
    Date of Patent: February 27, 2001
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Stefan Rapp, Heinz-Jörg Schroeder, Friedhelm Zucker
  • Patent number: 5812519
    Abstract: The invention concerns a high storage capacity ROM-RAM disk and a process for reading and writing to the ROM-RAM disk. T he aim of the invention is to devise a ROM-RAM disk and a process making it possible to read ROM and RAM simultaneously, to read the ROM area and at the same time write to the RAM area and to provide the largest possible volume of memory. The invention comprises two alternative designs. In a first design a ROM-RAM disk contains an area having both ROM and RAM memory structures as of a certain radius or diameter, establishing therein, at a constant rotational speed, a scanning/writing speed which ensures a reading/separation of the data stored in the ROM-RAM structures. In a second design, the available storage area is taken up entirely by a ROM-RAM storage area, where RAM memory structures have a reduced data rate in order to form, a length of memory structures necessary for separating the data stored in the ROM-RAM storage area.
    Type: Grant
    Filed: September 20, 1996
    Date of Patent: September 22, 1998
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Akira Kawamura, Yasuaki Morimoto, Friedhelm Zucker
  • Patent number: 5802029
    Abstract: A reproduction and/or recording device for optical recording media which is compatible in respect of varying storage density, despite an interdependence between pit or domain size, and the light spot size. Use is made of a track guidance signal generation device which can be changed over according to the storage density type and is connected to a detector which can be used for recording media of varying storage density, i.e. in the form of the standardized CD, minidisk or MOD, and for optical recording media, which have a comparatively higher information storage density, or smaller track spacings and smaller dimensions of the pits or storage structures.
    Type: Grant
    Filed: July 25, 1996
    Date of Patent: September 1, 1998
    Assignee: Deutsche Thomson Brandt GmbH
    Inventor: Friedhelm Zucker
  • Patent number: 5764605
    Abstract: A system for guidance of an optical scanning device is disclosed in which a gain factor (G factor) is responsive to a track error signal which is a function of the deflection of a scanning device. Deviation of the G factor setting from an optimum setting is automatically determined in conjunction with an open track control loop by driving a servo device (SV) to deflect an actuator from its neutral position and by evaluating a push-pull signal (PPTE). The G-factor is automatically set to an optimum value.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: June 9, 1998
    Assignee: Deutsche Thomson-Brandt GmbH
    Inventors: Friedhelm Zucker, Christian Buchler