Patents by Inventor Yoshiharu Uchihara
Yoshiharu Uchihara 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: 6847590Abstract: A magneto-optical recording medium which includes a reproducing layer. When a laser beam is irradiated to the magneto-optical recording medium, a magnetic domain in a recording layer is transferred, through enlargement, to a reproducing layer increased in temperature. The magneto-optical recording medium further includes a calibration area that has a calibration magnetic domain recorded in a predetermined pattern in the recording layer. In a reproducing apparatus, a laser beam of an optical head is adjusted in output depending upon a reproduced signal obtained by reproducing the calibration magnetic domain.Type: GrantFiled: August 17, 2001Date of Patent: January 25, 2005Assignees: Sanyo Electric Co., Ltd., Hitachi Maxell, Ltd.Inventors: Atsushi Yamaguchi, Naoyuki Takagi, Yoshiharu Uchihara, Satoshi Sumi, Hiroyuki Awano, Hiroshi Shirai, Hitoshi Watanabe, Norio Ohta
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Patent number: 6621772Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.Type: GrantFiled: December 29, 2000Date of Patent: September 16, 2003Assignee: Sanyo Electric Co., Ltd.Inventors: Kenji Asano, Noboru Mamiya, Yoshiharu Uchihara, Satoshi Sumi, Kenji Nakao, Hiroshi Watanabe, Toshiaki Hioki, Yoshihiro Hori, Hisashi Matsuyama, Kenji Torazawa, Kenji Tanase, Sayoko Tanaka, Yoshihisa Suzuki, Shigeki Hori
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Patent number: 6400653Abstract: An magneto-optical disc recording/reproducing apparatus includes an optical head (36) to detect a wobble (46) and an address mark (81 to 84) in an magneto-optical disc (31) and output a wobble signal (WB1, WB2) and an address mark signal (AML, AMG), a PLL circuit (47) to generate a clock signal (CK) in response to wobble signal (WB1), an address mark synchronous signal generation circuit (46) to generate an address mark synchronous signal (AM) in response to address mark signal (AML, AMG), a synchronizing circuit (48) to synchronize clock signal (CK) with address mark synchronous signal (AM) and generate a synchronized clock signal (SCK), and a timing setting circuit (49) to generate a timing pulse signal (TG1) to control a magnetic head driving circuit (34) and a timing pulse signal (TG2) to control a laser driving circuit (35).Type: GrantFiled: August 5, 1999Date of Patent: June 4, 2002Assignee: Sanyo Electric Co. Ltd.Inventors: Kenji Torazawa, Kenji Asano, Satoshi Sumi, Yoshiharu Uchihara, Noboru Mamiya, Toshiaki Hioki
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Publication number: 20020012295Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.Type: ApplicationFiled: March 24, 1999Publication date: January 31, 2002Applicant: Sanyo Electric Co., LtdInventors: KENJI ASANO, NOBORU MAMIYA, YOSHIHARU UCHIHARA, SATOSHI SUMI, KENJI NAKAO, HIROSHI WATANABE, TOSHIAKI HIOKI, YOSHIHIRO HORI, HISASHI MATSUYAMA, KENJI TORAZAWA, KENJI TANASE, SAYOKO TANAKA, YOSHIHISA SUZUKI, SHIGEKI HORI
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Publication number: 20010050885Abstract: A magneto-optical recording medium includes a reproducing layer. When a laser beam is irradiated to the magneto-optical recording medium, a magnetic domain in a recording layer is transferred, through enlargement, to a reproducing layer increased in temperature. The magneto-optical recording medium further includes a calibration area that has a calibration magnetic domain recorded in a predetermined pattern in the recording layer. In a reproducing apparatus, a laser beam of an optical head is adjusted in output depending upon a reproduced signal obtained by reproducing the calibration magnetic domain.Type: ApplicationFiled: August 17, 2001Publication date: December 13, 2001Applicant: Sanyo Electric Co., LtdInventors: Atsushi Yamaguchi, Naoyuki Takagi, Yoshiharu Uchihara, Satoshi Sumi, Hiroyuki Awano, Hiroshi Shirai, Hitoshi Watanabe, Norio Ohta
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Patent number: 6324138Abstract: A meandering groove is formed in a digital disk (10) with a wobble signal that is wobbled to reproduce a clock signal. The wobble signal is read out by an optical head (26). An address detection circuit (40) detects an address signal that is multiplexed with the wobble signal. A PLL oscillation circuit (24) provides a clock signal in synchronization with the wobble signal. Data is modulated by a modulation circuit (16) according to the clock signal and a timing signal based on the address signal, and recorded on the digital disk (10). In reproduction, a RF signal in the wobble signal is converted into a digital signal by an A/D converter (42). The signal is demodulated by a demodulation circuit (44) for data output.Type: GrantFiled: June 23, 2000Date of Patent: November 27, 2001Assignee: Sanyo Electric Co., Ltd.Inventors: Yoshihiro Hori, Hisashi Matsuyama, Akiomi Kunisa, Nobuo Itoh, Seiichiro Takahashi, Toshiaki Hioki, Kenji Asano, Noboru Mamiya, Yoshiharu Uchihara, Kenji Nakao, Satoshi Sumi, Kenji Torazawa
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Publication number: 20010033532Abstract: A magneto-optical record medium and a reproducing apparatus for the same allow data reproduction having good characteristics by a simple structure. The magneto-optical record medium includes a plurality of first grooves (3) each having sidewalls, at least one of which is wobbled in accordance with address information; an address mark (21) formed by changing a width of a land located between second grooves connected to the first grooves; and third grooves wobbled cyclically, formed in a data portion magnetically storing data and connected to the second grooves. The reproducing apparatus reproduces the data from the magneto-optical record medium.Type: ApplicationFiled: December 29, 2000Publication date: October 25, 2001Inventors: Kenji Asano, Noboru Mamiya, Yoshiharu Uchihara, Satoshi Sumi, Kenji Nakao, Hiroshi Watanabe, Toshiaki Hioki, Yoshihiro Hori, Hisashi Matsuyama, kenji Torazawa, Kenji Tanase, Sayoko Tanaka, Yoshihisa Suzuki, Shigeki Hori
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Patent number: 6301199Abstract: A magneto-optical recording medium which includes a reproducing layer. When a laser beam is irradiated to the magneto-optical recording medium, a magnetic domain in a recording layer is transferred, through enlargement, to a reproducing layer increased in temperature. The magneto-optical recording medium further includes a calibration area that has a calibration magnetic domain recorded in a predetermined pattern in the recording layer. In a reproducing apparatus, a laser beam of an optical head is adjusted in output depending upon a reproduced signal obtained by reproducing the calibration magnetic domain.Type: GrantFiled: July 1, 1998Date of Patent: October 9, 2001Assignees: Sanyo Electric Co., Ltd., Hitachi Maxell, Ltd.Inventors: Atsushi Yamaguchi, Naoyuki Takagi, Yoshiharu Uchihara, Satoshi Sumi, Hiroyuki Awano, Hiroshi Shirai, Hitoshi Watanabe, Norio Ohta
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Patent number: 6243326Abstract: A magneto-optic disk and a recording/reproduction device therefor adopt optical super-resolution to increase recording capacity. More specifically, the magneto-optic disk has an heat emitting layer (6) on a recording layer (4) and still preferably has an intermediate layer (8) between a reproduction layer (3) and the recording layer (4). The recording/reproduction device includes a circuit (33) for pulsing a laser beam to be radiated to the magneto-optic disk and still preferably includes a polarization rotating unit (50) and a polarizing filter (51) for blocking only the center of the laser beam in reproduction. The heat emitting layer (6) diffusing any heat generated by the laser beam, and the discontinuously radiated laser beam allow small recording domain. The laser beam having its center blocked forms smaller main lobe due to diffraction effect.Type: GrantFiled: October 19, 1998Date of Patent: June 5, 2001Assignee: Sanyo Electric Co., Ltd.Inventors: Satoshi Sumi, Yoshihisa Suzuki, Atsushi Yamaguchi, Kenji Tanase, Yoshiharu Uchihara, Kenji Torazawa, Seiji Murata
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Patent number: 6198710Abstract: A meandering groove is formed in a digital disk (10) with a wobble signal that is wobbled to reproduce a clock signal. The wobble signal is read out by an optical head (26). An address detection circuit (40) detects an address signal that is multiplexed with the wobble signal. A PLL oscillation circuit (24) provides a clock signal in synchronization with the wobble signal. Data is modulated by a modulation circuit (16) according to the clock signal and a timing signal based on the address signal, and recorded on the digital disk (10). In reproduction, a RF signal in the wobble signal is converted into a digital signal by an A/D converter (42). The signal is demodulated by a demodulation circuit (44) for data output.Type: GrantFiled: June 9, 1998Date of Patent: March 6, 2001Assignee: Sanyo Electric Co., Ltd.Inventors: Yoshihiro Hori, Hisashi Matsuyama, Akiomi Kunisa, Nobuo Itoh, Seiichiro Takahashi, Toshiaki Hioki, Kenji Asano, Noboru Mamiya, Yoshiharu Uchihara, Kenji Nakao, Satoshi Sumi, Kenji Torazawa
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Patent number: 5968678Abstract: In magneto-optical recording medium, on a transparent substrate of polycarbonate resin, an SiN film having the thickness of 600 to 800 .ANG. and surface roughness Rmax of at most 10 nm is formed. On the SiN film, a GdFeCo reading layer having the thickness of 800 to 1200 .ANG. with Gd content of 30 to 36 at. % and Co content of 12 to 50 at. % is formed. On the reading layer, a TbFeCo recording layer of which Co content is 10 to 16 at. % is formed. The recording layer is a perpendicular magnetization film, and the reading layer is an in-plane magnetization film. At the time of reading, the reading and recording layers are heated, and the direction of magnetization of the recording layer is transferred to the reading layer only in the prescribed heated area. Information can be read only from the transferred portion, and thus a super resolution effect is obtained. When Kerr rotation angle .theta..sub.Type: GrantFiled: July 30, 1996Date of Patent: October 19, 1999Assignee: Sanyo Electric., Ltd.Inventors: Kenji Tanase, Atsushi Yamaguchi, Yoshihisa Suzuki, Satoshi Sumi, Yoshiharu Uchihara, Seiji Murata, Kenji Torasawa
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Patent number: 4957776Abstract: The method of manufacturing an optical disc related to the invention first forms warp prevention layer on one surface or the other surface of the disc substrate where information is recorded on one surface, and then, recording film covering the surface opposite from the surface having warp prevention layer or beam reflection film covering the information-recorded surface, and finally protection layer covering either the beam reflection film or the recording film, in this order. Thus the optical disc related to this invention can prevent damage and dust from incurring and adhering to the other surface of the disc substrate when forming these films on one surface so that the warp prevention layer can be perfectly level by suppressing swell of the layer itself.Type: GrantFiled: January 3, 1989Date of Patent: September 18, 1990Assignee: Sanyo Electric Co., Ltd.Inventors: Masahiro Higuchi, Sadao Sakamoto, Yoshiharu Uchihara