Patents by Inventor Naoya Hotta
Naoya Hotta 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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Publication number: 20120113781Abstract: An optical disk apparatus according to the present invention includes: a drive selector 28 that makes a switch between a setting for sending a drive signal generated by a focus drive generation section 25 to a focus drive section 29, and a setting for sending a drive signal generated by a focus filter 27 to the focus drive section 29; and a lock-in timing detection section 21 that, upon a light amount signal detected by a light amount signal detection section exceeding a predetermined light amount level, determines that an optical spot reaches a vicinity of any of recording layers, and sends to the drive selector 28 a focus lock-in timing instruction for switching to the setting for sending the drive signal generated by the focus filter 27 to the focus drive section 29. Such configuration provides an optical disk apparatus allowing a stable focus lock in operation to be performed without using a layer determination signal when locking a focus into a recording layer of an optical disk.Type: ApplicationFiled: February 28, 2011Publication date: May 10, 2012Inventors: Takamitsu Watanabe, Naoya Hotta
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Patent number: 7508742Abstract: An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (?1, ?2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals. The distance d1 between the center of the photo detecting portion PD0 and the light emitting spot of the first semiconductor laser light source and a distance d2 between the center of the photo detecting portion PD0 and the light emitting spot of the second semiconductor laser light source substantially satisfy the following relationship: ?1/?2=d1/d2.Type: GrantFiled: July 28, 2004Date of Patent: March 24, 2009Assignee: Panasonic CorporationInventors: Yoshiaki Komma, Eishin Mori, Naoya Hotta
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Patent number: 7031247Abstract: Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic waveform generator generates periodic waveform and an inverting element inverts the periodic waveform. The periodic waveform and the inverted waveform are connected to two ends of a potential divider which provides partial voltages. The periodic waveform is connected to a common electrode of the liquid crystal element, and the partial voltages of the potential divider are connected to electrodes opposing the common electrode. A structure of a driver circuit for each direction is simple. Tilt in a plurality of directions can be performed independently of each other. Spherical aberration is also corrected. When the liquid crystal element is mounted to a fixed component, deterioration due to jitters is reduced.Type: GrantFiled: September 24, 2003Date of Patent: April 18, 2006Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuhiko Yasuda, Hidenori Wada, Daisuke Ogata, Kanji Wakabayashi, Naoya Hotta
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Patent number: 6928035Abstract: An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (?1, ?2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals. The distance d1 between the center of the photo detecting portion PD0 and the light emitting spot of the first semiconductor laser light source and a distance d2 between the center of the photo detecting portion PD0 and the light emitting spot of the second semiconductor laser light source substantially satisfy the following relationship: ?1/?2=d1/d2.Type: GrantFiled: July 3, 2001Date of Patent: August 9, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiaki Komma, Eishin Mori, Naoya Hotta
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Publication number: 20050036429Abstract: Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic waveform generator generates periodic waveform and an inverting element inverts the periodic waveform. The periodic waveform and the inverted waveform are connected to two ends of a potential divider which provides partial voltages. The periodic waveform is connected to a common electrode of the liquid crystal element, and the partial voltages of the potential divider are connected to electrodes opposing the common electrode. A structure of a driver circuit for each direction is simple. Tilt in a plurality of directions can be performed independently of each other. Spherical aberration is also corrected. When the liquid crystal element is mounted to a fixed component, deterioration due to jitters is reduced.Type: ApplicationFiled: September 24, 2003Publication date: February 17, 2005Inventors: Katsuhiko Yasuda, Hidenori Wada, Daisuke Ogata, Kanji Wakabayashi, Naoya Hotta
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Publication number: 20050002292Abstract: An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (?1, ?2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals. The distance d1 between the center of the photo detecting portion PD0 and the light emitting spot of the first semiconductor laser light source and a distance d2 between the center of the photo detecting portion PD0 and the light emitting spot of the second semiconductor laser light source substantially satisfy the following relationship: ?1/?2=d1/d2.Type: ApplicationFiled: July 28, 2004Publication date: January 6, 2005Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Yoshiaki Komma, Eishin Mori, Naoya Hotta
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Patent number: 6661415Abstract: Tilt which is inclination of a normal of optical disk relative to optical axis of optical head is corrected with a liquid crystal element. In a driver for the liquid crystal element, a periodic waveform generator generates periodic waveform and an inverting element inverts the periodic waveform. The periodic waveform and the inverted waveform are connected to two ends of a potential divider which provides partial voltages. The periodic waveform is connected to a common electrode of the liquid crystal element, and the partial voltages of the potential divider are connected to electrodes opposing the common electrode. A structure of a driver circuit for each direction is simple. Tilt in a plurality of directions can be performed independently of each other. Spherical aberration is also corrected. When the liquid crystal element is mounted to a fixed component, deterioration due to jitters is reduced.Type: GrantFiled: June 22, 2000Date of Patent: December 9, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuhiko Yasuda, Hidenori Wada, Daisuke Ogata, Kanji Wakabayashi, Naoya Hotta, Yoshihiro Ikawa, Yoshihiro Kanda, Masahiro Inata
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Patent number: 6532202Abstract: An optical element has a phase change layer for changing the phase of light passing therethrough; a plurality of aberration correcting electrodes, arranged on one side of said phase change layer, for correcting optical aberrations, each of said aberration correcting electrodes being split into a plurality of regions; an insulating film interposed between said aberration correcting electrodes; and a specific electrode arranged on the other side of said phase change layer, and wherein: said aberration correcting electrodes, at least other than the outermost aberration correcting electrode as viewed from said phase change layer, have openings formed in prescribed positions, and each of said aberration correcting electrodes, other than the innermost aberration correcting electrode, faces said phase change layer through said openings formed in other aberration correcting electrodes.Type: GrantFiled: July 7, 2000Date of Patent: March 11, 2003Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Hidenori Wada, Shin-ichi Kadowaki, Hiroaki Yamamoto, Tetsuo Saimi, Daisuke Ogata, Naoya Hotta, Sadao Mizuno
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Publication number: 20030007436Abstract: An optical pick-up capable of reproducing information excellently on both CD and DVD, which are significantly different in terms of three kinds of factors, a base material thickness, a wavelength of a light source, and NA, and detecting TE signals by three kinds of methods, that is, the phase difference method, the PP method, and the 3-beam method, which are necessary to record and reproduce information. The optical pick-up is formed by integrating laser light sources having two kinds of wavelengths (&lgr;1, &lgr;2) for detecting TE signals; photodetectors, and hologram for generating the diffracted light for detecting signals.Type: ApplicationFiled: July 3, 2001Publication date: January 9, 2003Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Yoshiaki Komma, Eishin Mori, Naoya Hotta