Patents by Inventor Yasufumi Takasugi
Yasufumi Takasugi 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: 7266065Abstract: It is an object of the present invention is to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is formed with periodical undulation in the circumferential direction thereof. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode 11, a second electrode 12, an alternate current signal generation circuit 13 for applying an alternate current A to the first electrode 11, a detection circuit 14 for detecting a level of an alternate current B appearing at the second electrode 12, and a control circuit 15 for controlling the operations of the alternate current signal generation circuit 13 and the detection circuit 14.Type: GrantFiled: April 25, 2003Date of Patent: September 4, 2007Assignee: TDK CorporationInventors: Yasufumi Takasugi, Kazuo Fukunaga, Toshikazu Hosobuchi, Takashi Namioka, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Patent number: 7200084Abstract: The present invention provides a method and an apparatus for discriminating the type of an optical recording medium and the number of recording layers in the medium. The apparatus includes a first electrode and a second electrode placed in the vicinity of a light transmission layer of the recording medium, an alternating current signal generation circuit for applying an alternating current A to the first electrode, a detection circuit for detecting the level of an alternating current B appearing at the second electrode, and a control circuit for controlling the operations of the alternating current signal generation circuit and the detection circuit, and a table provided in the control circuit.Type: GrantFiled: April 18, 2003Date of Patent: April 3, 2007Assignee: TDK CorporationInventors: Takashi Namioka, Yasufumi Takasugi, Kazuo Fukunaga, Toshikazu Hosobuchi, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Patent number: 7158459Abstract: It is an object of the present invention to provide an apparatus for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped and formed with periodical undulation in the circumferential direction thereof.Type: GrantFiled: April 25, 2003Date of Patent: January 2, 2007Assignee: TDK CorporationInventors: Toshikazu Hosobuchi, Takashi Namioka, Yasufumi Takasugi, Kazuo Fukunaga, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Patent number: 7085213Abstract: It is an object of the present invention to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped.Type: GrantFiled: April 23, 2003Date of Patent: August 1, 2006Assignee: TDK CorporationInventors: Kazuo Fukunaga, Toshikazu Hosobuchi, Takashi Namioka, Yasufumi Takasugi, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa, Tsutomu Kotani
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Publication number: 20050237913Abstract: It is an object of the present invention is to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is formed with periodical undulation in the circumferential direction thereof. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode 11, a second electrode 12, an alternate current signal generation circuit 13 for applying an alternate current A to the first electrode 11, a detection circuit 14 for detecting a level of an alternate current B appearing at the second electrode 12, and a control circuit 15 for controlling the operations of the alternate current signal generation circuit 13 and the detection circuit 14.Type: ApplicationFiled: April 25, 2003Publication date: October 27, 2005Applicant: TDK CorporationInventors: Yasufumi Takasugi, Kazuo Fukunnaga, Toshikazu Hosobuchi, Takashi Namioka, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Publication number: 20050169141Abstract: It is an object of the present invention is to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can quickly discriminate the kind of an optical recording medium. The apparatus for discriminating an optical recording medium according to the present invention includes a first electrode and a second electrode, an alternating current signal generation circuit for applying an alternating current A to the first electrode, a detection circuit for detecting the level of an alternating current B appearing at the second electrode, and a control circuit for controlling the operations of the alternating current signal generation circuit and the detection circuit, and a table provided in the control circuit.Type: ApplicationFiled: April 18, 2003Publication date: August 4, 2005Inventors: Takashi Namioka, Yasufumi Takasugi, Kazuo Fukunaga, Toshikazu Hosobuchi, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Publication number: 20050157621Abstract: It is an object of the present invention to provide an apparatus for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped and formed with periodical undulation in the circumferential direction thereof.Type: ApplicationFiled: April 25, 2003Publication date: July 21, 2005Applicant: TDK CORPORATIONInventors: Toshikazu Hosobuchi, Takashi Namioka, Yasufumi Takasugi, Kazuo Fukunaga, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa
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Publication number: 20050152249Abstract: It is an object of the present invention to provide an apparatus for discriminating an optical recording medium and a method for discriminating an optical recording medium which can reliably discriminate the kind of an optical recording medium even in the case where the optical recording medium to be discriminated is warped.Type: ApplicationFiled: April 23, 2003Publication date: July 14, 2005Applicant: TDK CORPORATIONInventors: Kazuo Fukunaga, Toshikazu Hosobuchi, Takashi Namioka, Yasufumi Takasugi, Giichi Shibuya, Hideki Hirata, Kazuki Suzawa, Tsutomu Kotani
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Publication number: 20050017384Abstract: The present invention provides a substrate for an optical disk using a transparent plastic film having a hard-coating layer on one surface of the film and a method of producing the same.Type: ApplicationFiled: June 8, 2004Publication date: January 27, 2005Inventors: Kiminori Tamai, Chieko Yamada, Katsuhiko Yamazaki, Yasufumi Takasugi, Kazuki Suzawa, Takashi Koshimizu, Shigeyo Miyamori, Kenichi Kitamura
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Publication number: 20040042363Abstract: A record data recording method according to the invention is a method of recording record data (Dd) on a recording medium (OD) such as a removable optical disk. In recording the record data (Dd) on the recording medium (OD), device specification data [serial number data (Ds) concerning an associated recording/reproducing device (1) or authentication program data (Dps) including the serial number data (Ds)] for specifying a recording/reproducing device (1) permitted to read the record data (Dd) is recorded, and at the same time a determination program is recorded which is read out by a recording/reproducing device (1) before the record data (Dd) recorded on the recording medium (OD) is read, so as to determine identity between the recording/reproducing device (1) which read out the determination program and the recording/reproducing device (1) specified based on the device specification data.Type: ApplicationFiled: June 12, 2003Publication date: March 4, 2004Inventors: Nobuyuki Kobayashi, Ken Fujii, Yasufumi Takasugi, Takashi Namioka
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Publication number: 20040028384Abstract: A digital recording/reproducing apparatus according to the present invention is configured to be capable of mounting a removable recording medium (M) therein, and includes a recording control section (10) for recording record data (DS) on the recording medium (M), and a reproducing control section (10) for carrying out reproduction based on the record data (DS) recorded on the recording medium (M). The digital recording/reproducing apparatus (1) comprises an index data generating section (4) for generating index data (DID) for detecting a cue position used to cue a predetermined recording position in the record data (DS) at a time of cue reproduction.Type: ApplicationFiled: June 2, 2003Publication date: February 12, 2004Inventors: Ken Fujii, Yasufumi Takasugi, Takashi Namioka, Nobuyuki Kobayashi
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Patent number: 6605341Abstract: An object of the present invention is to provide functional films which can exhibit a variety of functions using functional fine particles, in particular, a transparent conductive film having a low resistance value using conductive fine particles. The functional film of the present invention is a functional film comprising a support and a functional layer on at least one surface of the support, wherein the above functional layer contains functional fine particles, and a ratio (&sgr;1/&sgr;2) between a dispersion value (&sgr;2) obtainable from the alignment of the functional fine particles at the front surface of the functional layer and a dispersion value (&sgr;1) obtainable from the alignment of the functional fine particles at the opposite surface of the functional layer is from 1.2 to 1.85.Type: GrantFiled: May 16, 2001Date of Patent: August 12, 2003Assignee: TDK CorporationInventors: Kiminori Tamai, Tadayoshi Iijima, Hiroshi Kawahara, Yasufumi Takasugi
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Publication number: 20020051879Abstract: An object of the present invention is to provide functional films which can exhibit a variety of functions using functional fine particles, in particular, a transparent conductive film having a low resistance value using conductive fine particles. The functional film of the present invention is a functional film comprising a support and a functional layer on at least one surface of the support, wherein the above functional layer contains functional fine particles, and a ratio (&sgr;1/&sgr;2) between a dispersion value (&sgr;2) obtainable from the alignment of the functional fine particles at the front surface of the functional layer and a dispersion value (&sgr;1) obtainable from the alignment of the functional fine particles at the opposite surface of the functional layer is from 1.2 to 1.85.Type: ApplicationFiled: May 16, 2001Publication date: May 2, 2002Applicant: TDK CorporationInventors: Kiminori Tamai, Tadayoshi Iijima, Hiroshi Kawahara, Yasufumi Takasugi
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Patent number: 5837744Abstract: Polyoxymethylene articles having a surface printable with an ultraviolet-curing ink are obtained by molding a polyoxymethylene and treating the molded article by ultraviolet irradiation, corona discharge, or electron-beam radiation until the surface has an X-ray photoelectron spectrum in which the ratio of the ?C--O!.sub.n bond peak at 302 eV to the C--C bond peak at 305 eV, i.e., the ?C--O!.sub.n bond peak/C--C bond peak ratio, is at least 2.5.Type: GrantFiled: July 1, 1996Date of Patent: November 17, 1998Assignee: TDK CorporationInventors: Naoyuki Nagashima, Hitoshi Azegami, Yasufumi Takasugi
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Patent number: 5698286Abstract: A magnetic layer is provided on a nonmagnetic base with a non-ferromagnetic layer interposed between them. Non-ferromagnetic particulate iron oxide is incorporated in the non-ferromagnetic layer. In addition to, or in place of, this iron oxide, non-structural carbon having a mean particle diameter of 10 to 60 nm, a specific surface area of 150 m2/g as measured by the BET method and a DBP oil absorption of 100 ml/100 g or less may be used. This makes it possible to achieve a magnetic recording medium having excellent surface properties and good-enough electromagnetic transducing characteristics.Type: GrantFiled: September 25, 1996Date of Patent: December 16, 1997Assignee: TDK CorporationInventors: Tsunehiko Ikarashi, Yasufumi Takasugi, Tsutomu Aoyama, Akira Saitoh, Yuko Motegi, Takayoshi Kuwajima
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Patent number: 5443913Abstract: In a magnetic recording medium comprising on a non-magnetic substrate a magnetic layer obtained by dispersing ferromagnetic powder in an electron beam-curable resin followed by electron beam curing or a backcoat layer obtained by curing an electron beam-curable resin with electron beams, a combination of an electron beam-curable vinyl chloride resin having a sulfur-containing polar group and an electron beam-curable urethane resin having a phosphorus-containing polar group is used as the electron beam-curable resin. This results in improvements in dispersibility, surface smoothness, and electromagnetic characteristics, as well as a lowering of error rate in high density digital recording. Storage property is good.Type: GrantFiled: October 15, 1993Date of Patent: August 22, 1995Assignee: TDK CorporationInventors: Masahide Kohno, Kazuhiro Kuroda, Yasushi Ishikawa, Hideki Sasaki, Yasufumi Takasugi, Tsunehiko Ikarashi, Osamu Inoue
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Patent number: 4892789Abstract: In a magnetic recording medium comprising a substrate, a ferromagnetic metal thin film formed on the substrate, and a topcoat formed on the thin film, the topcoat comprises a plasma-polymerized film containing carbon and hydrogen with the atomic ratio of carbon to hydrogen being from 1 to 6, and an organic material film deposited on the plasma-polymerized film by evaporation.Type: GrantFiled: December 23, 1985Date of Patent: January 9, 1990Assignee: TDK CorporationInventors: Masatoshi Nakayama, Yasufumi Takasugi, Kunihiro Ueda
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Patent number: 4844978Abstract: In a magnetic recording medium comprising a substrate, a ferromagnetic metal thin film formed on the substrate, and a topcoat formed on the thin film, the topcoat is a plasma-polymerized film containing carbon and hydrogen in an atomic ratio of C/H of from 1 to 6, and having a thickness of 10 to 40 angstroms and a contact angle with water in the range of from 60.degree. to 130.degree..Type: GrantFiled: November 6, 1985Date of Patent: July 4, 1989Assignee: TDK CorporationInventors: Masatoshi Nakayama, Yasufumi Takasugi, Kunihiro Ueda
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Patent number: 4824724Abstract: A magnetic recording medium is provided comprising a non-magnetic substrate, a magnetic metal layer of continuous thin film type deposited on the substrate, and a topcoat film on the magnetic layer. The topcoat film is formed by sputtering or ion plating a fluorocarbon resin so that it consists essentially of carbon and fluorine, and fluorine atoms of the topcoat film are chemically combined with metal atoms of the magnetic layer in proximity to the interface.Type: GrantFiled: May 30, 1986Date of Patent: April 25, 1989Assignee: TDK CorporationInventors: Kunihiro Ueda, Yasufumi Takasugi, Masatoshi Nakayama
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Patent number: 4759954Abstract: In a magnetic recording medium comprising a substrate and a magnetic layer thereon, the magnetic layer is formed by coating a composition of a binder, preferably radiation-curable binder and a needle magnetic material, passing the coating through a magnetic field to forcedly re-orient the magnetic particles to form pores having an average pore area of 6.times.10.sup.-5 to 7.times.10.sup.-1 .mu.m.sup.2, and curing the coating, thereby minimizing output fluctuation and improving durability. Preferably lubricant is present in the pores.Type: GrantFiled: December 8, 1986Date of Patent: July 26, 1988Assignee: TDK CorporationInventors: Yuichi Kubota, Yasufumi Takasugi, Yousuke Hitomi, Tsunehiko Ikarashi, Fuminori Tokuda