Patents by Inventor Yasushi Hanamoto
Yasushi Hanamoto 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).
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Patent number: 7512042Abstract: In an optical disk recording and reproducing device which uses an optical disk having at least a first recording layer and a second recording layer, a thickness of a spacer section between the first recording layer and the second recording layer is measured, an amount of defocus with respect to the second recording layer is set based on the measured spacer thickness, and a focus servo operation is performed for focusing the laser light irradiated from an optical pickup device on the second recording layer.Type: GrantFiled: July 14, 2005Date of Patent: March 31, 2009Assignee: Sanyo Electric Co., Ltd.Inventors: Hitoshi Ogura, Tsuyoshi Yamamoto, Koji Tsukagoshi, Hideki Osawa, Yasushi Hanamoto, Yasuki Mori
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Patent number: 7304927Abstract: An optical disk apparatus is disclosed which makes accesses on a block-by-block basis to an optical disk having a recording track segmented into first recording areas by first address information correlated with wobbling information of the recording track, the block being a unit for error correction consisting of a plurality of the first recording areas. The optical disk apparatus comprises an access control unit which, when an access is made to a second recording area consisting of a plurality of the first recording areas, provides access control in sequence without applying any data modulation and/or demodulation process to each of the plurality of first recording areas constituting the second recording area.Type: GrantFiled: April 29, 2004Date of Patent: December 4, 2007Assignee: Sanyo Electric Co., Ltd.Inventor: Yasushi Hanamoto
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Patent number: 7184379Abstract: An operation for recording a recording signal onto a disk (1) is interrupted, when an amount of signal data stored in a buffer RAM (11) for temporarily storing the recording signal is less than an interruption setting value during performing of the recording operation. Moreover, when the amount of signal data stored in the buffer RAM (11) increases and indicates a resumption setting value, the signal recorded on the disk (1) before interruption is reproduced, and the recording operation is resumed based on the reproduced signal. Moreover, recording properties are detected by the signal reproduced before resumption of recording.Type: GrantFiled: February 20, 2002Date of Patent: February 27, 2007Assignee: Sanyo Electric Co., Ltd.Inventors: Akira Tsukihashi, Toru Tanaka, Yasushi Hanamoto, Shinji Seki, Toshihiko Hiroshima, Yutaka Imamura
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Patent number: 7149165Abstract: A controller for a data recorder for recording data that records data in a continuous manner regardless of interruptions. An encoder encodes data that is to be written to a recording medium. A synchronizing circuit synchronizes the data read from the recording medium with the encoded data when the writing of data to the recording medium is interrupted. A first retry determination circuit determines whether an address of the data read from the recording medium and an address of the data provided to the encoder match. A second retry determination circuit determines whether the timing for reading data from recording medium and the timing for encoding data match. A restart circuit restarts the writing of data to the recording medium based on the determinations of the first and second retry determination circuits.Type: GrantFiled: December 26, 2000Date of Patent: December 12, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Koji Hayashi, Akira Tsukihashi, Yasushi Hanamoto, Tohru Tanaka
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Patent number: 7149167Abstract: A data recorder for recording data that records data in a continuous manner regardless of interruptions. An encoder encodes data that is to be written to a recording medium. A synchronizing circuit synchronizes the data read from the recording medium with the encoded data when the writing of data to the recording medium is interrupted. A first retry determination circuit determines whether an address of the data read from the recording medium and an address of the data provided to the encoder match. A second retry determination circuit determines whether the timing for reading data from recording medium and the timing for encoding data match. A restart circuit restarts the writing of data to the recording medium based on the determinations of the first and second retry determination circuits.Type: GrantFiled: December 26, 2000Date of Patent: December 12, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Koji Hayashi, Akira Tsukihashi, Yasushi Hanamoto, Tohru Tanaka
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Patent number: 7102974Abstract: To provide a method for optimizing the optical output from an optical head when recording data onto an optical disk, each time a suspension of data recording onto the disk is determined, the optical head reads data recorded onto the disk before the suspension, and recording state of this data is judged. Based on the judged recording state, the optical output from the optical head to be emitted when resuming the data recording is controlled. A timing at which to suspend data recording can be desirably set, so that the recording state of the recorded data in the disk can be judged at desirable timing in data recording operation, so that the optical output from the optical head is controlled based on the judged recording state.Type: GrantFiled: March 5, 2001Date of Patent: September 5, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Akira Tsukihashi, Yasushi Hanamoto, Katsuki Hattori
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Patent number: 7072263Abstract: A pickup control circuit (5) for performing a control operation of an optical pickup (3) and an error detection circuit (14) for detecting an error signal from a servo signal obtained from the pickup control circuit (5) are provided. During an operation to change to a faster recording speed, a playback operation for an already recorded signal is performed at the recording speed after the change, and an error detection level is set on the basis of characteristics of the servo signal in the playback operation state.Type: GrantFiled: January 29, 2003Date of Patent: July 4, 2006Assignee: Sanyo Electric Co., Ltd.Inventors: Yasushi Hanamoto, Toshihiko Hiroshima
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Patent number: 6992957Abstract: A controller of a data recorder that records data on a recording medium such that the occurrence of buffer underrun errors are prevented. Data encoded by an encoder is recorded on the recording medium. A decoder decodes the data recorded on the recording medium. The data recorder interrupts the recording of data when a buffer underrun is likely to occur. The controller restarts the recording of data when the decoded data and the encoded data are synchronized. When the decoded data is delayed from the encoded data, the controller stops the encoding until the decoded data catches up with the encoded data.Type: GrantFiled: December 26, 2000Date of Patent: January 31, 2006Inventors: Koji Hayashi, Akira Tsukihashi, Yasushi Hanamoto, Tohru Tanaka
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Publication number: 20060013082Abstract: In an optical disk recording and reproducing device which uses an optical disk having at least a first recording layer and a second recording layer, a thickness of a spacer section between the first recording layer and the second recording layer is measured, an amount of defocus with respect to the second recording layer is set based on the measured spacer thickness, and a focus servo operation is performed for focusing the laser light irradiated from an optical pickup device on the second recording layer.Type: ApplicationFiled: July 14, 2005Publication date: January 19, 2006Applicant: Sanyo Electric Co., Ltd.Inventors: Hitoshi Ogura, Tsuyoshi Yamamoto, Koji Tsukagoshi, Hideki Osawa, Yasushi Hanamoto, Yasuhiko Mori
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Patent number: 6925044Abstract: When during the operation of recording a signal onto a disk the amount of signal data stored in a buffer RAM for temporarily storing a recording signal falls below an interruption set value, the recording operation on the disk is interrupted. Subsequently, when the amount of signal data stored in the buffer RAM increases to a resumption set value, a signal recorded on the disk before the interruption is reproduced. On the basis of the reproduced signal, the recording operation is resumed from a position where the recording is interrupted. The operation of resuming recording that is interrupted due to a shock is permitted. The operation of resuming recording after the interruption of the recording is started from a position that is before the position where the recording is interrupted.Type: GrantFiled: August 28, 2002Date of Patent: August 2, 2005Assignee: Sanyo Electric Co., Ltd.Inventors: Yasushi Hanamoto, Toru Tanaka
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Publication number: 20040223432Abstract: An optical disk apparatus is disclosed which makes accesses on a block-by-block basis to an optical disk having a recording track segmented into first recording areas by first address information correlated with wobbling information of the recording track, the block being a unit for error correction consisting of a plurality of the first recording areas. The optical disk apparatus comprises an access control unit which, when an access is made to a second recording area consisting of a plurality of the first recording areas, provides access control in sequence without applying any data modulation and/or demodulation process to each of the plurality of first recording areas constituting the second recording area.Type: ApplicationFiled: April 29, 2004Publication date: November 11, 2004Inventor: Yasushi Hanamoto
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Publication number: 20030151990Abstract: A pickup control circuit 5) for performing a control operation of an optical pickup 3) and an error detection circuit 14) for detecting an error signal from a servo signal obtained from the pickup control circuit 5) are provided. During an operation to change to a faster recording speed, a playback operation for an already recorded signal is performed at the recording speed after the change, and an error detection level is set on the basis of characteristics of the servo signal in the playback operation state.Type: ApplicationFiled: January 29, 2003Publication date: August 14, 2003Applicant: SANYO ELECTRIC CO., LTD.Inventors: Yasushi Hanamoto, Toshihiko Hiroshima
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Publication number: 20030058761Abstract: When during the operation of recording a signal onto a disk the amount of signal data stored in a buffer RAM for temporarily storing a recording signal falls below an interruption set value, the recording operation on the disk is interrupted. Subsequently, when the amount of signal data stored in the buffer RAM increases to a resumption set value, a signal recorded on the disk before the interruption is reproduced. On the basis of the reproduced signal, the recording operation is resumed from a position where the recording is interrupted. The operation of resuming recording that is interrupted due to a shock is permitted. The operation of resuming recording after the interruption of the recording is started from a position that is before the position where the recording is interrupted.Type: ApplicationFiled: August 28, 2002Publication date: March 27, 2003Applicant: Sanyo Electric Co., Ltd.Inventors: Yasushi Hanamoto, Toru Tanaka
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Patent number: 6489740Abstract: To provide a spindle motor control method adapted to an optical disk recording and reproducing apparatus capable of recording a signal onto a disk using a laser applied from an optical pick-up, a reference signal originated from a disk (1) and a reference signal necessary for signal recording are synchronized to each other when resuming signal recording once suspended. The synchronization is established without using a phase error component. Once synchronization is established, a phase error component is added to a servo signal of the spindle motor (2). A gain for a phase error component is begun gradually increasing after a phase error component is begun being added to a servo signal. An upper limit value of the gain of a phase error component to be added is determined depending on the location of a part on the disk (1) at which to resume the once suspended signal recording.Type: GrantFiled: May 10, 2001Date of Patent: December 3, 2002Assignee: Sanyo Electric Co., Ltd.Inventors: Yasushi Hanamoto, Toru Tanaka
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Publication number: 20020150011Abstract: An operation for recording a recording signal onto a disk (1) is interrupted, when an amount of signal data stored in a buffer RAM (11) for temporarily storing the recording signal is less than an interruption setting value during performing of the recording operation. Moreover, when the amount of signal data stored in the buffer RAM (11) increases and indicates a resumption setting value, the signal recorded on the disk (1) before interruption is reproduced, and the recording operation is resumed based on the reproduced signal. Moreover, recording properties are detected by the signal reproduced before resumption of recording.Type: ApplicationFiled: February 20, 2002Publication date: October 17, 2002Applicant: SANYO ELECTRIC CO., LTDInventors: Akira Tsukihashi, Toru Tanaka, Yasushi Hanamoto, Shinji Seki, Toshihiko Hiroshima, Yutaka Imamura
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Patent number: 6356520Abstract: Additional recording data is written continuously with data already recorded on a disk and writing of additional data is started in synch with recorded data. The optical head 1 reads data recorded on the disk just before recording is halted every time the record decision unit 22 judges that recording is to be halted. The record-status detection unit 25 detects the formation status of the recorded data. The head output control unit 14 sets the luminous output of the optical head 1 at the beginning of additional writing according to the recording state judged by the record-state detection unit 25. Thus, the formation status of data recorded on a disk is detected to allow the luminous output of the optical head 1 to be set to an optimum record level.Type: GrantFiled: November 16, 2000Date of Patent: March 12, 2002Assignee: Sanyo Electric Co., Ltd.Inventors: Yasushi Hanamoto, Toshihiko Hiroshima
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Publication number: 20010046378Abstract: To provide a spindle motor control method adapted to an optical disk recording and reproducing apparatus capable of recording a signal onto a disk using a laser applied from an optical pick-up, a reference signal originated from a disk (1) and a reference signal necessary for signal recording are synchronized to each other when resuming signal recording once suspended. The synchronization is established without using a phase error component. Once synchronization is established, a phase error component is added to a servo signal of the spindle motor (2). A gain for a phase error component is begun gradually increasing after a phase error component is begun being added to a servo signal. An upper limit value of the gain of a phase error component to be added is determined depending on the location of a part on the disk (1) at which to resume the once suspended signal recording.Type: ApplicationFiled: May 10, 2001Publication date: November 29, 2001Applicant: SANYO ELECTRIC CO., LTD.Inventors: Yasushi Hanamoto, Toru Tanaka
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Publication number: 20010026517Abstract: To provide a method for optimizing the optical output from an optical head when recording data onto an optical disk, each time a suspension of data recording onto the disk is determined, the optical head reads data recorded onto the disk before the suspension, and recording state of this data is judged. Based on the judged recording state, the optical output from the optical head to be emitted when resuming the data recording is controlled. A timing at which to suspend data recording can be desirably set, so that the recording state of the recorded data in the disk can be judged at desirable timing in data recording operation, so that the optical output from the optical head is controlled based on the judged recording state.Type: ApplicationFiled: March 5, 2001Publication date: October 4, 2001Applicant: SANYO ELECTRIC CO., LTD.Inventors: Akira Tsukihashi, Yasushi Hanamoto, Katsuki Hattori
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Publication number: 20010006495Abstract: A controller of a data recorder that records data on a recording medium such that the occurrence of buffer underrun errors are prevented. Data encoded by an encoder is recorded on the recording medium. A decoder decodes the data recorded on the recording medium. The data recorder interrupts the recording of data when a buffer underrun is likely to occur. The controller restarts the recording of data when the decoded data and the encoded data are synchronized. When the decoded data is delayed from the encoded data, the controller stops the encoding until the decoded data catches up with the encoded data.Type: ApplicationFiled: December 26, 2000Publication date: July 5, 2001Inventors: Koji Hayashi, Akira Tsukihashi, Yasushi Hanamoto, Tohru Tanaka
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Publication number: 20010006498Abstract: A data recorder for recording data on a recording medium such that the occurrence of buffer underrun errors are prevented. Data encoded by an encoder is recorded on the recording medium. A decoder decodes the data recorded on the recording medium. The data recorder interrupts the recording of data when a buffer underrun is likely to occur. The recording of data is restarted when the decoded data and the encoded data are synchronized. When the decoded data is delayed from the encoded data, encoding is stopped until the decoded data catches up with the encoded data.Type: ApplicationFiled: December 26, 2000Publication date: July 5, 2001Inventors: Koji Hayashi, Akira Tsukihashi, Yasushi Hanamoto, Tohru Tanaka