Patents by Inventor Osamu Kawakubo
Osamu Kawakubo 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: 7940606Abstract: A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.Type: GrantFiled: June 9, 2009Date of Patent: May 10, 2011Assignee: Sony CorporationInventors: Ariyoshi Nakaoki, Naoto Kojima, Koji Sekiguchi, Osamu Kawakubo, Kazuhiko Fujiie
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Publication number: 20100177622Abstract: An optical disk reproducing device includes: a semiconductor laser for sequentially emitting singular peak light and singular slope light as laser light when supplied with a driving pulse formed in a form of a pulse and formed of a predetermined singular voltage; an objective lens for condensing the laser light onto a recording layer disposed in an optical disk, and converting an angle of divergence of return light returned from the recording layer; a detection signal generating section configured to detect respective light intensities in each of wavelength bands in the return light, and respectively generate a plurality of detection signals according to the respective light intensities; and a reproduction processing section configured to reproduce information recorded on the optical disk on a basis of the plurality of detection signals.Type: ApplicationFiled: January 12, 2010Publication date: July 15, 2010Applicant: Sony CorporationInventors: Ariyoshi Nakaoki, Osamu Kawakubo
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Publication number: 20090310446Abstract: A signal detecting device includes: a semiconductor substrate; a near-field light generating section that is provided on the semiconductor substrate and generates near-field light near an interface with the semiconductor substrate; a light source that outputs light having wavelength corresponding to photon energy about a half as large as band-gap energy of a material of the semiconductor substrate; and a current detecting unit that detects a photocurrent generated in the semiconductor substrate when the near-field light is generated.Type: ApplicationFiled: June 9, 2009Publication date: December 17, 2009Applicant: Sony CorporationInventors: Ariyoshi Nakaoki, Naoto Kojima, Koji Sekiguchi, Osamu Kawakubo, Kazuhiko Fujiie
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Patent number: 6418103Abstract: Disclosed are an apparatus for initializing an optical recording medium to be initialized with stability and ease without employing any focus servo means, and a phase-changing optical recording medium initialized by the initializing apparatus to have a recording layer in a uniform crystalline state over an entire area of the medium which takes part in recording and reproduction of an information signal. In the apparatus for initializing a phase-changing optical recording medium, a laser beam emitted from a laser beam source is irradiated to a recording layer, in an amorphous state, formed in an optical recording medium to be initialized, which is a pre-stage member of the phase-changing optical recording medium, for changing the recording layer into a crystalline state. The laser beam source, e.g.Type: GrantFiled: September 9, 1999Date of Patent: July 9, 2002Assignee: Sony CorporationInventors: Kazumine Ito, Manami Nakamura, Osamu Kawakubo, Hiroshi Kawase
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Patent number: 6312780Abstract: A phase change optical recording medium which enables optimum direct overwrite even under high speed high density conditions without degrading repetition durability or storage stability of recorded signals. To this end, the phase change optical recording medium has a recording layer formed at least of a phase change material and is recorded and/or reproduced with a laser light beam having a wavelength ranging between 380 nm and 420 nm. A ratio Ac/Aa, where Ac is the absorption rate of said recording layer in a crystalline state and Aa is the absorption rate of said recording layer in an amorphous state, is not less than 0.9, and a crystallization promoting layer promoting the crystallization of the phase change material is contacted with at least one surface of the recording layer.Type: GrantFiled: February 16, 2000Date of Patent: November 6, 2001Assignee: Sony CorporationInventors: Yutaka Kasami, Osamu Kawakubo, Katsuhiro Seo
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Patent number: 6246656Abstract: An optical recording medium is provided which achieves a higher recording capacity. This optical recording medium includes a base formed of thermoplastic resin which has a thickness ranging from between approximately 0.3 to 1.2 mm, a guide groove formed on the base, an information recording layer formed at least of a reflective film and an organic dye recording layer provided on the guide groove, and a light transmissive layer having a thickness ranging from between approximately 3 to 177 &mgr;m. In this optical recording medium, the unevenness &Dgr;t of the thickness of the light transmissive layer is set within the range of: &Dgr;t≦±5.26(&lgr;/N.A.4)(&mgr;m) wherein N.A. represents a numerical aperture of an optical head device of the optical disk recording and/or reproducing apparatus and &lgr; represents the wavelength of laser light utilized by the optical disk recording and/or reproducing apparatus.Type: GrantFiled: April 20, 1998Date of Patent: June 12, 2001Assignee: Sony CorporationInventors: Osamu Kawakubo, Toshiyuki Kashiwagi, Koichi Yasuda, Masahiko Kaneko
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Patent number: 6023451Abstract: An optical recording medium according to the present invention includes a base layer having an information signal portion formed on a surface on the side on which laser light is incident, and a light transmissive layer formed on the base layer. A thickness t of the light transmissive layer is within the range of t=3 to 177 .mu.m at least in an area of the information signal portion. If unevenness of the light transmissive layer is .DELTA.t, N.A. of an optical system for reproduction or recording and reproduction and a wavelength .lambda. satisfies .DELTA.t.ltoreq..+-.5.26 (.lambda./N.A..sup.4) (.mu.m). A track pitch is P and a skew is .THETA., then P.ltoreq.0.64 .mu.m and .THETA..ltoreq..+-.84.115.degree. (.lambda./N.A..sup.3 /t) are satisfied. The optical recording medium is recorded or reproduced by a recording and reproducing system satisfying .lambda..ltoreq.0.68 .mu.m and N.A./.lambda..gtoreq.1.20. The optical recording medium permits a recording capacity of 8 GB.Type: GrantFiled: March 24, 1998Date of Patent: February 8, 2000Assignee: Sony CorporationInventors: Toshiyuki Kashiwagi, Osamu Kawakubo, Ariyoshi Nakaoki, Masahiko Kaneko
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Patent number: 5972459Abstract: An optical recording medium is provided which achieves a higher recording capacity. This optical recording medium includes a base formed of thermoplastic resin which has a thickness ranging from between approximately 0.3 to 1.2 nm, a guide groove formed on the base, at least a reflective film and a phase-change recording layer successively formed on the guide groove, arid a light transmissive layer having a thickness ranging from between approximately 3 to 177 .mu.m. In this optical recording medium, the unevenness .DELTA.t of the thickness of the light transmission layer is set within the range of:.DELTA.t.ltoreq..+-.5.26(.lambda./N.A..sup.4)(.mu.m)wherein N.A. represents a numerical aperture of an optical head device of the optical disk recording and/or reproducing apparatus and .lambda. represents the wavelength of laser light utilized by the optical disk recording and/or reproducing apparatus.Type: GrantFiled: April 20, 1998Date of Patent: October 26, 1999Assignee: Sony CorporationInventors: Osamu Kawakubo, Toshiyuki Kashiwagi, Koichi Yasuda, Masahiko Kaneko, Mitsuo Naito, Motohiro Furuki
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Patent number: 5923639Abstract: An optical recording medium having a phase-changing material layer served as a recording layer is composed to excellently repeat the rewrite of bits independently of the line speed of the writing light. The amount of the additive to be added to the phase-changing material layer is regulated in relation to the line speed for the write. The additive is added for suppressing the crystallization.Type: GrantFiled: September 24, 1997Date of Patent: July 13, 1999Assignee: Sony CorporationInventors: Koichi Yasuda, Osamu Kawakubo
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Patent number: 4972337Abstract: A rotation control for a magnet used in a magneto-optical recording system having a first coil that rotates a permanent magnet to invert the polarity of its magnetic field applied to an optical recording type disc and a second coil provided at the position displaced from the central line of the first coil and for applying a driving force to the permanent magnet when the permanent magnet begins to rotate, wherein the permanent magnet can be settled in quite a short time after it is inverted in polarity by controlling a drive current applied to the second coil.Type: GrantFiled: December 11, 1987Date of Patent: November 20, 1990Assignee: Sony CorporationInventors: Naoya Eguchi, Osamu Kawakubo, Hitoshi Okada, Tamotsu Maeda, Susumu Tosaka
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Patent number: 4771347Abstract: Disclosed is herein a magneto-optical recording system comprising: preparing a magneto-optical recording medium comprising a magneto-optical recording layer and a bias magnetic field formed on a transparent substrate, the magneto-optical recording layer having Curie temperature higher than room temperature, the bias magnetic layer having compensation temperature higher than Curie temperature, the magneto-optical recording layer and the bias magnetic layer being superposed having a nonmagnetic layer therebetween, and applying heating means to the magneto-optical recording medium having first and second heating power levels, the first heating power level being selected enough to heat the magneto-optical recording layer higher than the Curie temperature of the magneto-optical recording layer and to heat the bias magnetic layer higher than the compensation temperature of the bias magnetic layer, the second heating power level being selected enough to heat the magneto-optical recording layer higher than the CurieType: GrantFiled: December 17, 1986Date of Patent: September 13, 1988Assignee: Sony CorporationInventors: Hideyoshi Horimai, Osamu Kawakubo, Yoshio Aoki
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Patent number: 4600397Abstract: The present invention discloses a method of producing a discharge display device which enables formation of a satisfactory LaB.sub.6 cathode without using a LaB.sub.6 paste containing a glass binder. The method of the present invention comprises the steps of applying a conductive paste containing a glass binder, temporarily drying said conductive paste to form a conductive paste layer, forming a LaB.sub.6 layer containing no glass binder on said conductive paste layer, burning said conductive paste layer and said LaB.sub.6 layer, at the same time, and activating said LaB.sub.6 layer after being burnt, and after an exhausting step by gas discharge with large current to form a LaB.sub.6 cathode.Type: GrantFiled: April 11, 1985Date of Patent: July 15, 1986Assignee: Sony CorporationInventors: Osamu Kawakubo, Eiji Munemoto, Akihiko Okubora