Patents by Inventor Masayoshi Shioya
Masayoshi Shioya 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: 7277372Abstract: A method for recognizing at least two types of optical discs, which are associated with multiple different numerical apertures, includes the step of setting the numerical aperture of a focusing mechanism equal to a first one of the multiple different numerical apertures. The focusing mechanism is used to focus a light beam on a data storage layer of a given optical disc. The first numerical aperture is smaller than any of the other numerical apertures. The method further includes the step of recognizing the type of the given optical disc by the first numerical aperture that has been selected in the step of setting the numerical aperture.Type: GrantFiled: March 22, 2004Date of Patent: October 2, 2007Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuya Watanabe, Takashi Kishimoto, Rie Takahashi, Masayoshi Shioya
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Patent number: 6965545Abstract: An information recording medium for reproducing information by irradiation with a laser beam condensed by an objective lens with a numerical aperture NA includes a disk-shaped substrate and a recording layer disposed on the substrate. On the surface of the substrate, a plurality of prepit regions and a plurality of data regions are disposed alternately along spiral or concentric virtual track centers. Each prepit region includes a pair of wobble pits for tracking servo, and a length L (?m) of the wobble pit along the virtual track center, a wavelength ? (?m) of the laser beam, and a numerical aperture NA satisfy a relationship: 0.3?L. NA/??0.65.Type: GrantFiled: August 16, 2001Date of Patent: November 15, 2005Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Yasumori Hino, Masayoshi Shioya, Kazumasa Hirano, Shohei Yumita
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Publication number: 20040190417Abstract: A method for recognizing at least two types of optical discs, which are associated with multiple different numerical apertures, includes the step of setting the numerical aperture of a focusing mechanism equal to a first one of the multiple different numerical apertures. The focusing mechanism is used to focus a light beam on a data storage layer of a given optical disc. The first numerical aperture is smaller than any of the other numerical apertures. The method further includes the step of recognizing the type of the given optical disc by the first numerical aperture that has been selected in the step of setting the numerical aperture.Type: ApplicationFiled: March 22, 2004Publication date: September 30, 2004Applicant: Matsushita Electric Industrial Co., Ltd.Inventors: Katsuya Watanabe, Takashi Kishimoto, Rie Takahashi, Masayoshi Shioya
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Publication number: 20040105357Abstract: A recording and reproduction apparatus, for irradiating a recording medium having a track with an optical beam to record information on and reproduce information from the recording medium, includes a tracking error detection section for detecting a positional offset between the optical beam and the track and outputting a tracking error signal corresponding to the positional offset; an amplification section for amplifying, based on a prescribed value of a gain, the tracking error signal to be output, wherein the prescribed value of the gain is adjustable; a tracking control section for controlling a position of the optical beam based on the tracking error signal amplified by the amplification section; and a control section for adjusting the prescribed value of the gain of the amplification section. The control section adjusts the prescribed value of the gain of the amplification section based on a linear velocity of the recording medium.Type: ApplicationFiled: October 23, 2003Publication date: June 3, 2004Applicant: MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.Inventors: Masayoshi SHIOYA, Kiyoshi MASAKI, Shinichi YAMADA
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Publication number: 20030053343Abstract: An information recording medium for reproducing information by irradiation with a laser beam condensed by an objective lens with a numerical aperture NA includes a disk-shaped substrate and a recording layer disposed on the substrate. On the surface of the substrate, a plurality of prepit regions (110) and a plurality of data regions (120) are disposed alternately along spiral or concentric virtual track centers. Each prepit region includes a pair of wobble pits (113) for tracking servo. and a length L (&mgr;m) of the wobble pit along the virtual track center, a wavelength &lgr; (&mgr;m) of the laser beam, and a numerical aperture NA satisfy a relationship: 0.3≦L.NA/&lgr;≦0.Type: ApplicationFiled: August 26, 2002Publication date: March 20, 2003Inventors: Yasumori Hino, Masayoshi Shioya, Kazumasa Hirano, Shohei Yumita
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Patent number: 6449232Abstract: Optical disks compliant with different standards are recorded or reproduced by a single recording/reproducing apparatus by a first step of determining a substrate thickness of the disk based on a focusing error signal, when a focusing section for bringing the light beam into a focus on the disk is moved in such a way as to approach or withdraw from the recording surface of the disk; a second step of performing any one step of determining the number of recording surfaces of the disk when the focusing section is moved in such a way as to approach or withdraw from the recording surface of the disk, and determining whether or not the disk can be recorded and reproduced using a tracking error signal detected when the light beam crosses the track.Type: GrantFiled: August 1, 2000Date of Patent: September 10, 2002Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Masaya Kuwahara, Shinichi Yamada, Hiroyuki Yamaguchi, Masuo Maruyama, Masanari Mohri, Akihiro Sakaguchi, Yasuo Nishihara, Masayoshi Shioya
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Patent number: 6222340Abstract: According to a control device for a stepping motor of the present invention, in a first operation mode, a microstep driving section 16 is selected, and an output of this microstep driving section 16 is applied to a driving section 21 through a command selector 12, whereby a stepping motor 25 is microstep driven by this driving section 21. Furthermore, in a second operation mode, a forced driving section 15 is selected, and an output of this forced driving section 15 is applied to the driving section 21 through the command selector 12, whereby the stepping motor 25 is forced driven by this driving section 21, i.e., a high-speed rotation of a rotor 29 is started from any rotation angle with the microstep driving.Type: GrantFiled: December 10, 1999Date of Patent: April 24, 2001Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Toru Kawabata, Yoshihiro Mushika, Masayoshi Shioya
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Patent number: 5202864Abstract: In an apparatus in which information is reproduced by projecting/receiving an optical beam to/from a recording carrier having a large number of information tracks, tracking control is performed so as to maintain a reproducing position on an information track by supplying a track deviation signal to an actuator. If this track deviation signal becomes asymmetric by an inclination, etc. of the recording carrier so that a shock is applied to the apparatus, jumping out of a track occurs, resulting in slip-off of the optical beam from the reproducing position. This slip-off can be prevented by detecting a position of a movable support member carrying a focusing lens for projecting and receiving the optical beam and feeding back the position signal to the tracking control system, or by extracting a low-frequency component of an output signal of a control circuit and feeding back the extracted signal to the tracking control system.Type: GrantFiled: December 27, 1991Date of Patent: April 13, 1993Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsuro Moriya, Hiroyuki Yamaguchi, Masayoshi Shioya
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Patent number: 5109366Abstract: In an apparatus in which information is reproduced by projecting/receiving an optical beam to/from a recording carrier having a large number of information tracks, tracking control is performed so as to keep a reproducing position on an information track by supplying a track deviation signal to an actuator. If this track deviation signal becomes asymetric by an inclination, etc. of the recording carrier so that a shock is applied to the apparatus, jumping out of a track occurs, resulting in slipping-off of the reproducing position. This slipping-off can be prevented by detecting a position of a movable support member carrying a focusing lens for projecting and receiving the optical beam and feeding back the position signal to the tracking control system, or by extracting a low-frequency component of an output signal of a control circuit and feeding back the extracted signal to the tracking control system.Type: GrantFiled: April 12, 1989Date of Patent: April 28, 1992Assignee: Matsushita Electric Industrial Co., Ltd.Inventors: Mitsuro Moriya, Hiroyuki Yamaguchi, Masayoshi Shioya