Patents by Inventor Hirotoshi Fukuda
Hirotoshi Fukuda 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: 8179148Abstract: Proposed is a highly reliable information detecting apparatus and method. In an information detecting apparatus and method for detecting transmission information a transmission signal in which a burst period of transmitting a burst signal and a space period as a no-signal period are repeated in a pattern according to the subject matter of the transmission information, whether the absolute value of a signal amplitude level of the transmission signal is not less than a first threshold is detected, whether the absolute value of a signal amplitude level of the transmission signal is not less than a second threshold is detected, and whether the amplitude level displacement of the transmission signal is based on noise or the reception of the transmission information is determined based on the detection results.Type: GrantFiled: April 28, 2010Date of Patent: May 15, 2012Assignee: Hitachi-LG Data Storage, Inc.Inventors: Hirotoshi Fukuda, Junichi Iida, Masato Sano, Toshinori Arai
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Patent number: 8080959Abstract: A motor driving circuit includes at least one set of switching elements, each set of switching elements being two switching elements connected in series to each other, and a diode connected in parallel with one of the two switching elements connected on a power source side, a terminal of a motor to be driven being connected to a junction point between the two switching elements. A voltage transfer element is provided for transferring, from the junction point between the two switching elements, a voltage of a counter electromotive force generated at the motor, to an input end of the other of the two switching elements connected on a ground side.Type: GrantFiled: April 7, 2009Date of Patent: December 20, 2011Assignee: Hitachi-LG Data Storage, Inc.Inventors: Hirotoshi Fukuda, Junichi Iida
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Publication number: 20100329391Abstract: Proposed are a highly reliable information detecting apparatus and an information detecting method.Type: ApplicationFiled: April 28, 2010Publication date: December 30, 2010Inventors: Hirotoshi Fukuda, Junichi Iida, Masato Sano, Toshinori Arai
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Publication number: 20100332695Abstract: Proposed is a highly reliable information detecting apparatus and method. In an information detecting apparatus and method for detecting transmission information a transmission signal in which a burst period of transmitting a burst signal and a space period as a no-signal period are repeated in a pattern according to the subject matter of the transmission information, whether the absolute value of a signal amplitude level of the transmission signal is not less than a first threshold is detected, whether the absolute value of a signal amplitude level of the transmission signal is not less than a second threshold is detected, and whether the amplitude level displacement of the transmission signal is based on noise or the reception of the transmission information is determined based on the detection results.Type: ApplicationFiled: April 28, 2010Publication date: December 30, 2010Inventors: Hirotoshi Fukuda, Junichi Iida, Masato Sano, Toshinori Arai
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Publication number: 20090251088Abstract: A motor driving circuit includes at least one set of switching elements, each set of switching elements being two switching elements connected in series to each other, and a diode connected in parallel with one of the two switching elements connected on a power source side, a terminal of a motor to be driven being connected to a junction point between the two switching elements. A voltage transfer element is provided for transferring, from the junction point between the two switching elements, a voltage of a counter electromotive force generated at the motor, to an input end of the other of the two switching elements connected on a ground side.Type: ApplicationFiled: April 7, 2009Publication date: October 8, 2009Inventors: Hirotoshi Fukuda, Junichi Iida
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Patent number: 7406014Abstract: The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.Type: GrantFiled: October 6, 2004Date of Patent: July 29, 2008Assignees: Hitachi, Ltd., Hitachi-LG Data Storage Co., Ltd.Inventors: Kazuhiko Ono, Hirotoshi Fukuda, Takeshi Ikeda
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Publication number: 20050047300Abstract: The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.Type: ApplicationFiled: October 6, 2004Publication date: March 3, 2005Applicants: Hitachi, Ltd., Hitachi-LG Data Storage, Ltd.Inventors: Kazuhiko Ono, Hirotoshi Fukuda, Takeshi Ikeda
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Patent number: 6822936Abstract: The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD−RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.Type: GrantFiled: July 20, 2001Date of Patent: November 23, 2004Assignees: Hitachi, Ltd., Hitachi-LG Data Storage Co., Ltd.Inventors: Kazuhiko Ono, Hirotoshi Fukuda, Takeshi Ikeda
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Patent number: 6631105Abstract: When a deviated gravity disc is reproduced at a higher rate with the disc reproducing apparatus, an excessive vibration is generated and this vibration gives adverse effect on the disc reproducing apparatus and peripheral components/apparatuses, and/or may represent an annoyance to a user. A vibration information detector for detecting vibration of the disc reproducing apparatus or a deviated gravity information detector for detecting amount of gravity deviation of disc is provided, and as a result of such detection of an imbalance (i.e., excessive vibration or mass eccentricity), and a reproducing rate switching control controls sets and limits the reproducing rate of the disc reproducing apparatus to a substitute speed which is lower or higher than a normal reproducing speed.Type: GrantFiled: April 26, 2000Date of Patent: October 7, 2003Assignee: Hitachi, Ltd.Inventors: Hirotoshi Fukuda, Kazunaga Narita, Kiyonobu Teramoto, Hirohito Ishibashi, Toshihiro Matsunaga, Masato Sano
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Publication number: 20020150017Abstract: The invention relates to a disc discriminating method and an optical disc information reproducing apparatus wherein DVD-RAM which is DVD-RAM1 or DVD-RAM2 and DVDRW which is DVD-RW or DVD+RW which cannot be respectively determined based upon distance from the surface of a disc to the recording face, the number of recording faces and the reflectance can be discriminated. In case an optical disc is DVD-RAM or DVDRW, the amplitude of a push-pull tracking error signal is measured by a microcomputer in a state in which servo control is executed based upon a focus error signal. Determination is performed based upon the amplitude of the push-pull tracking error signal, when the amplitude of the push-pull tracking error signal is larger than a predetermined value, the optical disc is judged as DVD-RAM and when the amplitude is smaller than the predetermined value, the optical disc is judged as DVDRW.Type: ApplicationFiled: July 20, 2001Publication date: October 17, 2002Inventors: Kazuhiko Ono, Hirotoshi Fukuda, Takeshi Ikeda
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Patent number: 6445658Abstract: When a deviated gravity disc is reproduced at a higher rate with the disc reproducing apparatus, an excessive vibration is generated and this vibration gives adverse effect on the disc reproducing apparatus and peripheral components/apparatuses, and/or may represent an annoyance to a user. A vibration information detector for detecting vibration of the disc reproducing apparatus or a deviated gravity information detector for detecting amount of gravity deviation of disc is provided, and as a result of such detection of an imbalance (i.e., excessive vibration or mass eccentricity), and a reproducing rate switching control controls sets and limits the reproducing rate of the disc reproducing apparatus to a substitute speed which is lower or higher than a normal reproducing speed.Type: GrantFiled: November 26, 2001Date of Patent: September 3, 2002Assignee: Hitachi, Ltd.Inventors: Hirotoshi Fukuda, Kazunaga Narita, Kiyonobu Teramoto, Hirohito Ishibashi, Toshihiro Matsunaga, Masato Sano
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Publication number: 20020034140Abstract: When a deviated gravity disc is reproduced at a higher rate with the disc reproducing apparatus, an excessive vibration is generated and this vibration gives adverse effect on the disc reproducing apparatus and peripheral components/apparatuses, and/or may represent an annoyance to a user. A vibration information detector for detecting vibration of the disc reproducing apparatus or a deviated gravity information detector for detecting amount of gravity deviation of disc is provided, and as a result of such detection of an imbalance (i.e., excessive vibration or mass eccentricity), and a reproducing rate switching control controls sets and limits the reproducing rate of the disc reproducing apparatus to a substitute speed which is lower or higher than a normal reproducing speed.Type: ApplicationFiled: November 26, 2001Publication date: March 21, 2002Inventors: Hirotoshi Fukuda, Kazunaga Narita, Kiyonobu Teramoto, Hirohito Ishibashi, Toshihiro Matsunaga, Masato Sano
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Patent number: 6351440Abstract: When a deviated gravity disc is reproduced at a higher rate with the disc reproducing apparatus, an excessive vibration is generated and this vibration gives adverse effect on the disc reproducing apparatus and peripheral components/apparatuses, and/or may represent an annoyance to a user. A vibration information detector for detecting vibration of the disc reproducing apparatus or a deviated gravity information detector for detecting amount of gravity deviation of disc is provided, and as a result of such detection of an imbalance (i.e., excessive vibration or mass eccentricity), and a reproducing rate switching control controls sets and limits the reproducing rate of the disc reproducing apparatus to a substitute speed which is lower or higher than a normal reproducing speed.Type: GrantFiled: July 23, 1997Date of Patent: February 26, 2002Assignee: Hitachi, LtdInventors: Hirotoshi Fukuda, Kazunaga Narita, Kiyonobu Teramoto, Hirohito Ishibashi, Toshihiro Matsunaga, Masato Sano