Patents by Inventor Hideyuki Yamakawa

Hideyuki Yamakawa 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).

  • Publication number: 20070087645
    Abstract: A manufacturing method of a display device is disclosed. The display device can include: partition walls, a displaying part sectioned by the partition walls, a display function layer within the displaying part, and a substrate holding the partition walls, and the display function layer. The method can comprise forming at least one layer of the display function layer by an ink droplet supplied by transposition from an ink feed body, wherein the ink droplet is separated from the ink feed body after the ink droplet touches a region sectioned by the partition walls. After ink touched a region sectioned by partition walls, ink separates from ink feed body. Transposition of ink droplet forming the display layer is performed in this way. Therefore, even if a partition wall is not high, a partition wall can prevent ink droplet from scattering to other sections. Therefore, even if a partition wall does not include ink-repellent agent, a partition wall can prevent ink droplet from scattering to other sections.
    Type: Application
    Filed: August 9, 2006
    Publication date: April 19, 2007
    Inventors: Akiko Tsujii, Hideyuki Yamakawa, Takao Shishido
  • Publication number: 20070086301
    Abstract: A disk evaluating device includes a PR equalizer that equalizes reproduced signals from a disk to a response waveform of a partial response of a predetermined class, a maximum likelihood detector that performs maximum likelihood decoding on output signals from the PR equalizer, and an evaluating unit that classifies binary data output from the maximum likelihood detector into bit patterns of strings of consecutive bits, each of the strings having a predetermined length, and obtaines a histogram of amplitudes of the output signals from the PR equalizer for each of the bit patterns.
    Type: Application
    Filed: October 11, 2006
    Publication date: April 19, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventor: Hideyuki YAMAKAWA
  • Publication number: 20070085472
    Abstract: An organic electroluminescent element including a substrate, a first electrode, a partition wall next to the first electrode, an organic luminescent medium layer including an organic luminescent layer on the first electrode and second electrode is provided. The organic luminescent medium layer can be between the first electrode and the second electrode. An area where the organic luminescent medium layer is between the first electrode and the second electrode is a light emitting area. At least one layer among the organic luminescent medium layer is continuously formed from the light emitting area to a top face of the partition wall.
    Type: Application
    Filed: October 11, 2006
    Publication date: April 19, 2007
    Inventors: Hideyuki Yamakawa, Akiko Tsujii, Takao Shishido
  • Publication number: 20070030777
    Abstract: An optical disk device which decodes data recorded on an optical disk, comprises a first measuring unit which measure a cycle of a plurality of first synchronous signal regions VFO contained in a reproduction signal from an optical pickup, a cycle comparing unit which compares the measurement result of the first measuring unit with a first predetermined cycle, a second measuring unit which measures a cycle of a plurality of second synchronous signal regions SYNC which are contained in the reproduction signal from the optical pickup and have the cycle shorter than that of the plurality of first synchronous signal regions VFO, a cycle comparing unit which compares the measurement result of the second measuring unit with a second predetermined cycle, and an oscillator which generates a clock signal CKS for sampling the reproduction signal on the basis of the comparison results of the first and second cycle comparing units.
    Type: Application
    Filed: August 3, 2006
    Publication date: February 8, 2007
    Inventors: Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa, Hiroyuki Moro, Toshihiko Kaneshige, Hiroaki Morino
  • Publication number: 20070025212
    Abstract: According to one embodiment, there is provided an optical disk apparatus including a detecting unit which reads a reflective light from an optical disk and outputs a read signal, a decoder which decodes the read signal from the detecting unit, an extracting unit which extracts from the read signal the first and second specification information of the same content recorded in first and second areas on the optical disk, a processor which compares the first specification information with the second specification information and processes the specification information based on the comparison result, and a controller which controls the detecting unit or the decoder, based on the specification information processed by the processor.
    Type: Application
    Filed: July 27, 2006
    Publication date: February 1, 2007
    Inventors: Yukiyasu Tatsuzawa, Takahiro Nango, Hideyuki Yamakawa, Koichi Otake, Toshihiko Kaneshige, Hiroaki Morino
  • Publication number: 20070025213
    Abstract: An information reproducing apparatus according to the present invention is capable of reproducing an information storage medium storing BCA information recorded in a first area and RF information recorded in a second area on an outer side of the first area. The information reproducing apparatus includes an optical pickup to radiate laser light onto the first and second areas and detect reflected light thereof; a reproducing system unit to reproduce an RF signal and a BCA signal on the basis of the reflected light; and a focus control unit to control focusing by setting a focus position to a signal layer of the optical disc when the RF signal is to be reproduced and control defocusing by displacing the focus position from the signal layer when the BCA signal is to be reproduced, thereby equivalently suppressing a high-frequency component of the BCA signal.
    Type: Application
    Filed: July 27, 2006
    Publication date: February 1, 2007
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroaki Morino, Toshihiko Kaneshige, Koichi Otake, Hideyuki Yamakawa, Yukiyasu Tatsuzawa
  • Publication number: 20070025224
    Abstract: According to one embodiment, a frequency detector detects a frequency error between a frequency of a reproduction signal supplied from an analog to digital converter and a frequency of a clock for conversion. A loop filter controls an oscillation frequency of a voltage control oscillator based on the frequency error and a phase error detected by a phase comparator. An adaptive equalizer equalizes a waveform of the reproduction signal supplied from the analog to digital converter to obtain a response of a predetermined PR class. A Viterbi decoder decodes the waveform equalized signal into binary data by maximum likelihood sequence estimation. A clock supply control circuit stops supply of a clock to at least the phase comparator, the adaptive equalizer and the Viterbi decoder in a case where the frequency error is larger than a designated error.
    Type: Application
    Filed: July 27, 2006
    Publication date: February 1, 2007
    Inventors: Yukiyasu Tatsuzawa, Hideyuki Yamakawa, Koichi Otake, Toshihiko Kaneshige, Hiroaki Morino
  • Publication number: 20060092824
    Abstract: According to this invention, an information recording medium has the first and second sides. The information recording medium includes the first information recording layer which includes the first reflecting layer reflecting incident light with a predetermined intensity from the first side, the second information recording layer which includes a second reflecting layer reflecting incident light with a predetermined intensity from the second side, an adhesion layer which adheres the first information recording layer and the second information recording layer, and a unique information recording area which is formed by burst-cutting the first reflecting layer and the second reflecting layer in correspondence with medium unique information, using incident light with an intensity higher than the predetermined intensity from one of the first side and the second side.
    Type: Application
    Filed: October 17, 2005
    Publication date: May 4, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa, Hiroyuki Moro, Nobuhisa Yoshida, Toshihiko Kaneshige
  • Publication number: 20060092804
    Abstract: A signal processing circuit on a stage previous to a maximum likelihood decoder is more stably automatically controlled to have an optimum characteristic. A pre-equalizer, an offset control unit, an asymmetry control unit, an amplitude control unit, an analog digital converter, an adaptive equalizer, and a maximum likelihood decoder are sequentially arranged. A frequency control device and a phase control device are arranged. A sequencer feeds back error information obtained by the maximum likelihood decoder to any two of the offset control unit, the asymmetry control unit, the amplitude control unit, the analog digital converter, and the adaptive equalizer when at least the frequency control and phase control are set in predetermined control ranges, respectively.
    Type: Application
    Filed: October 28, 2005
    Publication date: May 4, 2006
    Inventors: Koichi Otake, Hideyuki Yamakawa, Yukiyasu Tatsuzawa, Hiroyuki Moro, Toshihiko Kaneshige
  • Publication number: 20060092803
    Abstract: A pre-learning section pre-learns whether or not a signal characteristic has been changed by use of at least data in a plurality of data areas, and obtains an optimum equalization coefficient of an adaptive equalizer for the data areas after the signal characteristic has been changed, and then stores the optimum equalization coefficient in a optimum equalization coefficient storage section. On the basis of detection information from a reference information (VFO) area detection section, the optimum equalization coefficient pre-learned in a reference information (VFO) area is preset in the adaptive equalizer, and equalization coefficient learning processing for the adaptive equalizer is started after entering a next data area.
    Type: Application
    Filed: October 28, 2005
    Publication date: May 4, 2006
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yukiyasu Tatsuzawa, Hideyuki Yamakawa, Koichi Otake, Hiroyuki Moro, Toshihiko Kaneshige
  • Publication number: 20060023604
    Abstract: There is provided an apparatus which can flexibly cope with both of a signal reproduction process for a region with high recording density and a signal reproduction process for a region with low recording density. The apparatus includes a waveform equalizing circuit which subjects data read out from an optical disk to a waveform equalizing process, a plurality of PRML processors of different classes supplied with an output signal of the waveform equalizing circuit, a switch which selects one of output signals of the plurality of PRML processors and supplies the selected output signal to a decoder, and a controller which controls the switch according to high-density and low-density regions with different recording densities of the optical disk to set a selection state in which a corresponding one of the output signals of the plurality of PRML processors is selected.
    Type: Application
    Filed: July 27, 2005
    Publication date: February 2, 2006
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa, Hiroyuki Moro, Toshihiko Kaneshige
  • Patent number: 6980385
    Abstract: In order to generate a sampling clock having a higher accuracy, a synchronous signal generating circuit is provided with a phase error detector, detecting a phase error of a read out signal digitized on the basis of FDTS algorithm, and a VCO, controlling an oscillation frequency on the basis of a phase error detected by the phase error detector, to generate a synchronous signal by the VCO. On the basis of the synchronous signal generated by the synchronous signal generating circuit, an ADC digitizes the read out signal. The digitized read out signal is then converted to binary data by a detection circuit.
    Type: Grant
    Filed: August 10, 2004
    Date of Patent: December 27, 2005
    Assignees: Hitachi Video and Information System, Inc., Hitachi Global Storage Technologies Japan, Ltd.
    Inventors: Takatoshi Kato, Takushi Nishiya, Hideyuki Yamakawa, Takashi Nara, Nobuaki Nakai, Hiroshi Ide, Shintaro Suzumura, Terumi Takashi
  • Patent number: 6975252
    Abstract: A disk apparatus has a reading unit which reads reflection light from a disk and outputting a read signal, an identifying unit which identifies whether the read signal has been modified in accordance with a first modulation rule or has been modulated in accordance with a second modulation rule and outputs an identification signal, an equalizing unit which applies a waveform equalizing process to the read signal, and a decoding unit which carries out likelihood decoding of the waveform equalized read signal according to the modulation rule indicated by the identification signal from the identifying unit, and outputs a reproduction signal.
    Type: Grant
    Filed: December 21, 2004
    Date of Patent: December 13, 2005
    Assignee: Kabushiki Kaisha Toshiba
    Inventors: Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa, Hiroyuki Moro, Toshihiko Kaneshige
  • Publication number: 20050265185
    Abstract: An optical disc apparatus in this invention includes an offset control unit which selects a parameter in accordance with the type of optical disc, and executes signal processing (offset control) by using the selected parameter.
    Type: Application
    Filed: May 27, 2005
    Publication date: December 1, 2005
    Inventors: Yutaka Kashihara, Akihito Ogawa, Hideyuki Yamakawa, Kazuyo Umezawa, Nobuhisa Yoshida, Noritake Oomachi, Tsukasa Nakai, Takayuki Tsukamoto
  • Publication number: 20050185559
    Abstract: A digital RF signal resulting from A/D conversion of an RF signal reproduced from an optical disk is compared with a plurality of set values, so that a predetermined waveform is detected from the digital RF signal. The wavelength of the detected waveform is measured, and the A/D conversion is controlled based on this wavelength. Comparing the digital RF signal with the plural set values enables high-accuracy waveform detection.
    Type: Application
    Filed: February 1, 2005
    Publication date: August 25, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hiroyuki Moro, Toshihiko Kaneshige, Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa
  • Publication number: 20050141385
    Abstract: A disk apparatus has a reading unit which reads reflection light from a disk and outputting a read signal, an identifying unit which identifies whether the read signal has been modified in accordance with a first modulation rule or has been modulated in accordance with a second modulation rule and outputs an identification signal, an equalizing unit which applies a waveform equalizing process to the read signal, and a decoding unit which carries out likelihood decoding of the waveform equalized read signal according to the modulation rule indicated by the identification signal from the identifying unit, and outputs a reproduction signal.
    Type: Application
    Filed: December 21, 2004
    Publication date: June 30, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hideyuki Yamakawa, Koichi Otake, Yukiyasu Tatsuzawa, Hiroyuki Moro, Toshihiko Kaneshige
  • Publication number: 20050141370
    Abstract: An optical disk drive apparatus is provided has a reading section which reads the reflection of a laser beam from a disk to produce a read signal, a filter section which filters the read signal with the use of three or more different cutoff frequencies upon receiving a control signal from a two or more bits control line, a reproducing section which playbacks the read signal filtered by the filter, and a control section which provides the filter with the control signal along the two or more bits control line so that the filtering action with the three or more different cutoff frequencies of the filter is carried out throughout three or more consecutive periods respectively.
    Type: Application
    Filed: December 16, 2004
    Publication date: June 30, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Hideyuki Yamakawa, Toshihiko Kaneshige, You Yoshioka
  • Publication number: 20050141378
    Abstract: A disk apparatus has an equalizing unit which performs PR equalization for the read signal from the disk based on a plurality of tap coefficients, a decoding unit which performs a decoding process for the equalized read signal, a calculating unit which obtains an ideal signal of the decoded read signal, and compares the ideal signal with the decoded read signal, thereby calculating an error signal E, and a control unit which groups the tap coefficients into at least a first and second coefficient groups which are groups of tap coefficients at symmetrical locations each, and determines tap coefficients of the first coefficient group in a range of a first limit value K1 according to the calculated error signal, determines tap coefficients of the second coefficient group in a range of a second limit value and supplies the determined tap coefficients to the equalizing unit.
    Type: Application
    Filed: December 15, 2004
    Publication date: June 30, 2005
    Applicant: Kabushiki Kaisha Toshiba
    Inventors: Yukiyasu Tatsuzawa, Koichi Otake, Hideyuki Yamakawa, Hiroyuki Moro, Toshihiko Kaneshige
  • Publication number: 20050141373
    Abstract: A recorded stream generator generates a data block stream in synchronism with the phase of a recording clock, from the input data. The recorded stream generator further generates, for each predetermined data unit constituting the data block stream, a data phase reference pulse indicative of the phase of the data unit. An inserting section inserts a VFO signal into a predetermined amount (32 sectors) of the data block stream, the VFO signal having a length of time corresponding to a difference in phase between an wobble address phase signal and a data phase reference pulse. The inserting section thus provides a data stream DST consisting of the VFO signals and the data block streams. An LD uses light beams to record the data stream on an optical disk.
    Type: Application
    Filed: December 22, 2004
    Publication date: June 30, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Toshihiko Kaneshige, Koichi Otake, Hideyuki Yamakawa, Yukiyasu Tatsuzawa, Hiroyuki Moro
  • Publication number: 20050117484
    Abstract: A disk device includes a reading section which reads reflected light and outputs a read signal according to the read reflected light, a processing section which calculates an adjustment value from the read signal, performs predetermined processing on the read signal based on the adjustment value, and outputs a process signal, a detecting section which detects a reading defect in the reading section based on the read signal, a determining section which determines signal quality of the process signal output from the processing section, a storage section which stores the adjustment value calculated by the processing section, in a memory area, based on a result output from the determining section, and a controller which, when the detecting section detects the reading defect, performs control so that the adjustment value is read out of the storage section and is supplied to the processing section.
    Type: Application
    Filed: November 23, 2004
    Publication date: June 2, 2005
    Applicant: KABUSHIKI KAISHA TOSHIBA
    Inventors: Yukiyasu Tatsuzawa, Koichi Otake, Hideyuki Yamakawa, Hiroyuki Moro, Toshihiko Kaneshige