Patents by Inventor Yasuhiro Muraoka
Yasuhiro Muraoka 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: 8363527Abstract: A disc apparatus is disclosed that includes a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium. A detrack-value setting unit is configured to set a detrack value for focusing an objective lens in the medium based on the jitter value. A detrack-value adjusting unit is configured to detect the jitter value every time the detrack value is changed stepwise within a predetermined range of the detrack value including a reference value of the detrack value, to obtain an optimum detrack value to be set in the detrack-value setting unit, based on a maximum jitter value and a minimum jitter value of the detected jitter values.Type: GrantFiled: June 10, 2011Date of Patent: January 29, 2013Assignee: Sanyo Electric Co., Ltd.Inventor: Yasuhiro Muraoka
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Patent number: 8053712Abstract: An inspecting method for an object lens driving device including a base, an objective lens, a holder for holding the objective lens on the base, and a drive mechanism for driving the holder so as to move the objective lens in the focus direction, the method comprising the steps of: emitting a laser beam through the objective lens; allowing the laser beam emitted through the objective lens to pass through an aperture having a predetermined diameter; applying to the drive mechanism a drive voltage for moving the holder between a first position closest to a surface of the base and a second position farther than the first position from the surface of the base; performing photoelectric conversion of the laser beam having passed through the aperture; and inspecting the objective lens driving device based on a signal obtained by the photoelectric conversion.Type: GrantFiled: February 20, 2009Date of Patent: November 8, 2011Assignee: Sanyo Electric Co., Ltd.Inventors: Yasuhiro Muraoka, Masaharu Sakazume, Yoshimaru Nakane, Hiroshi Yoshida, Shinya Tsukada
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Publication number: 20110235483Abstract: A disc apparatus is disclosed that includes a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium. A detrack-value setting unit is configured to set a detrack value for focusing an objective lens in the medium based on the jitter value. A detrack-value adjusting unit is configured to detect the jitter value every time the detrack value is changed stepwise within a predetermined range of the detrack value including a reference value of the detrack value, to obtain an optimum detrack value to be set in the detrack-value setting unit, based on a maximum jitter value and a minimum jitter value of the detected jitter values.Type: ApplicationFiled: June 10, 2011Publication date: September 29, 2011Applicant: SANYO ELECTRIC CO., LTD.Inventor: Yasuhiro Muraoka
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Patent number: 7969847Abstract: A disc apparatus comprising: a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium; a defocus-value setting unit configured to set a defocus value for focusing an objective lens in the medium based on the jitter value; and a defocus-value adjusting unit configured to detect the jitter value every time the defocus value is changed stepwise within a predetermined range of the defocus value including a reference value of the defocus value, to obtain an optimum defocus value to be set for the defocus-value setting unit within a predetermined time period, based on a maximum jitter value and a minimum jitter value of the detected jitter values.Type: GrantFiled: January 15, 2008Date of Patent: June 28, 2011Assignee: Sanyo Electric Co., Ltd.Inventor: Yasuhiro Muraoka
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Patent number: 7663988Abstract: An optical disc apparatus is disclosed that comprises a jitter value detecting circuit that detects a jitter value based on the signal read out from an optical disc; and a defocus value setting circuit that adjusts a defocus value used for moving an objective lens along the direction of a light axis when focusing of the objective lens to the optical disc is performed, based on the signal that has gone through the jitter value detecting circuit, and causes a defocus adjustment to be made based on the defocus value.Type: GrantFiled: November 15, 2006Date of Patent: February 16, 2010Assignee: Sanyo Electric Co., Ltd.Inventors: Yasuhiro Muraoka, Tatsushi Arai
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Publication number: 20090206239Abstract: An inspecting method for an object lens driving device including a base, an objective lens, a holder for holding the objective lens on the base, and a drive mechanism for driving the holder so as to move the objective lens in the focus direction, the method comprising the steps of: emitting a laser beam through the objective lens; allowing the laser beam emitted through the objective lens to pass through an aperture having a predetermined diameter; applying to the drive mechanism a drive voltage for moving the holder between a first position closest to a surface of the base and a second position farther than the first position from the surface of the base; performing photoelectric conversion of the laser beam having passed through the aperture; and inspecting the objective lens driving device based on a signal obtained by the photoelectric conversion.Type: ApplicationFiled: February 20, 2009Publication date: August 20, 2009Applicant: SANYO ELECTRIC CO., LTD.Inventors: Yasuhiro Muraoka, Masaharu Sakazume, Yoshimaru Nakane, Hiroshi Yoshida, Shinya Tsukada
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Publication number: 20080175115Abstract: A disc apparatus comprising: a jitter-value detection unit configured to detect a jitter value based on a signal to be read from a medium; a defocus-value setting unit configured to set a defocus value for focusing an objective lens in the medium based on the jitter value; and a defocus-value adjusting unit configured to detect the jitter value every time the defocus value is changed stepwise within a predetermined range of the defocus value including a reference value of the defocus value, to obtain an optimum defocus value to be set for the defocus-value setting unit within a predetermined time period, based on a maximum jitter value and a minimum jitter value of the detected jitter values.Type: ApplicationFiled: January 15, 2008Publication date: July 24, 2008Applicant: Sanyo Electronic Co., Ltd.Inventor: Yasuhiro Muraoka
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Publication number: 20080037123Abstract: An optical disc apparatus is disclosed that comprises a jitter value detecting circuit that detects a jitter value based on the signal read out from an optical disc; and a defocus value setting circuit that adjusts a defocus value used for moving an objective lens along the direction of a light axis when focusing of the objective lens to the optical disc is performed, based on the signal that has gone through the jitter value detecting circuit, and causes a defocus adjustment to be made based on the defocus value.Type: ApplicationFiled: November 15, 2006Publication date: February 14, 2008Applicant: SANYO ELECTRIC CO., LTD.Inventors: Yasuhiro Muraoka, Tatsushi Arai