Patents by Inventor Yoshiyasu Masuda
Yoshiyasu Masuda 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: 7916600Abstract: When performing writing and/or reading of information to/from an optical disk provided with a wobble including time axis information, an occurrence of a reading error of the time axis information from the wobble is suppressed so that disabled reading of information from the optical disk and an occurrence of a writing error can be prevented. Evaluated parameters such as a CRC error rate of an ATIP signal, an FMDT jitter amount and a phase error between an ATIP synchronization signal and a frame synchronization signal of writing data are evaluated based on a range of set values. When the evaluated parameter is deviated from the range of set values, writing and reading speeds are changed, thereby increasing the reading accuracy of the wobble signal.Type: GrantFiled: November 21, 2002Date of Patent: March 29, 2011Assignee: Sony CorporationInventors: Yoshiyasu Masuda, Takashi Sasaki, Tsunemitsu Takase
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Patent number: 7633847Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: GrantFiled: January 19, 2005Date of Patent: December 15, 2009Assignee: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Patent number: 7630285Abstract: When performing writing and/or reading of information to/from an optical disk provided with a wobble including time axis information, an occurrence of a reading error of the time axis information from the wobble is suppressed so that disabled reading of information from the optical disk and an occurrence of a writing error can be prevented. Evaluated parameters such as a CRC error rate of an ATIP signal, an FMDT jitter amount and a phase error between an ATIP synchronization signal and a frame synchronization signal of writing data are evaluated based on a range of set values. When the evaluated parameter is deviated from the range of set values, writing and reading speeds are changed, thereby increasing the reading accuracy of the wobble signal.Type: GrantFiled: April 12, 2007Date of Patent: December 8, 2009Assignee: Sony CorporationInventors: Yoshiyasu Masuda, Takashi Sasaki, Tsunemitsu Takase
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Publication number: 20070189144Abstract: When performing writing and/or reading of information to/from an optical disk provided with a wobble including time axis information, an occurrence of a reading error of the time axis information from the wobble is suppressed so that disabled reading of information from the optical disk and an occurrence of a writing error can be prevented. Evaluated parameters such as a CRC error rate of an ATIP signal, an FMDT jitter amount and a phase error between an ATIP synchronization signal and a frame synchronization signal of writing data are evaluated based on a range of set values. When the evaluated parameter is deviated from the range of set values, writing and reading speeds are changed, thereby increasing the reading accuracy of the wobble signal.Type: ApplicationFiled: April 12, 2007Publication date: August 16, 2007Applicant: Sony CorporationInventors: Yoshiyasu Masuda, Takashi Sasaki, Tsunemitsu Takase
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Patent number: 7123566Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: GrantFiled: January 19, 2005Date of Patent: October 17, 2006Assignee: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Publication number: 20050128932Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: ApplicationFiled: January 19, 2005Publication date: June 16, 2005Applicant: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Publication number: 20050122873Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: ApplicationFiled: January 19, 2005Publication date: June 9, 2005Applicant: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Patent number: 6856588Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: GrantFiled: July 10, 2003Date of Patent: February 15, 2005Assignee: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Publication number: 20040008601Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: ApplicationFiled: July 10, 2003Publication date: January 15, 2004Applicant: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda
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Patent number: 6614739Abstract: A recording apparatus generates a first pulse (EQEFM signal) in accordance with recording data such as an EFM signal. A second pulse (first overdrive pulse) to be combined with substantially the leading edge of the first pulse is generated. A third pulse (end overdrive pulse) to be combined with substantially the trailing edge of the first pulse is generated. The first, second, and third pulses are combined to synthesize a driving pulse, and the driving pulse is supplied to a laser unit. At least one of the first, second, and third pulses is controlled so that one of the level and the pulse duration thereof is varied in accordance with the length of formed pits and lands.Type: GrantFiled: August 29, 2000Date of Patent: September 2, 2003Assignee: Sony CorporationInventors: Takashi Sasaki, Munetoshi Moriichi, Mitsuyuki Bamba, Yoshiyasu Masuda