Patents by Inventor Jun Kanehira
Jun Kanehira 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: 7478413Abstract: An optical recording medium includes a plane ring-shaped substrate in which a center hole is opened at the center thereof, a recording-retrieving function layer and a cover layer each having an outer diameter approximately equal to that of the substrate and an inner diameter larger than an outer diameter of the center hole, are stacked on the substrate, and as a separate entity from the cover layer, a clamp portion which is for holding and fixing the substrate and which has an outer diameter smaller than inner diameters of the recording-retrieving function layer and the cover layer, is provided around the center hole in a region where the cover layer is not formed.Type: GrantFiled: August 18, 2004Date of Patent: January 13, 2009Assignees: Hitachi Maxell, Ltd., Mitsubishi Kagaku Media Co., Ltd.Inventors: Jun Kanehira, Osamu Ishizaki
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Patent number: 7001655Abstract: An optical recording medium simultaneously having higher recording characteristics and storage stability than ever, is obtained. An optical recording medium comprising at least a phase change recording layer, a first diffusion preventing layer, a second diffusion preventing layer and a protective layer formed in this order on a substrate, characterized in that the first diffusion preventing layer and the second diffusion preventing layer comprise a non-gas element and nitrogen and/or oxygen as the main components, the non-gas element in each of the first diffusion preventing layer and the second diffusion preventing layer, is the same, and the content (atomic %) of nitrogen and/or oxygen contained in the second diffusion preventing layer, is larger than the content (atomic %) of nitrogen and/or oxygen contained in the first diffusion preventing layer.Type: GrantFiled: December 1, 2004Date of Patent: February 21, 2006Assignees: Mitsubishi Chemical Corporation, Mitsubishi Kagaku Media Co., Ltd.Inventors: Kenjirou Kiyono, Jun Kanehira, Akio Okamuro
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Publication number: 20050079444Abstract: An optical recording medium simultaneously having higher recording characteristics and storage stability than ever, is obtained. An optical recording medium comprising at least a phase change recording layer, a first diffusion preventing layer, a second diffusion preventing layer and a protective layer formed in this order on a substrate, characterized in that the first diffusion preventing layer and the second diffusion preventing layer comprise a non-gas element and nitrogen and/or oxygen as the main components, the non-gas element in each of the first diffusion preventing layer and the second diffusion preventing layer, is the same, and the content (atomic %) of nitrogen and/or oxygen contained in the second diffusion preventing layer, is larger than the content (atomic %) of nitrogen and/or oxygen contained in the first diffusion preventing layer.Type: ApplicationFiled: December 1, 2004Publication date: April 14, 2005Applicants: Mitsubishi Chemical Corporation, Mitsubishi Kagaku Media Corporation Ltd.Inventors: Kenjirou Kiyono, Jun Kanehira, Akio Okamura
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Publication number: 20050044559Abstract: An optical recording medium includes a plane ring-shaped substrate in which a center hole is opened at the center thereof, a recording-retrieving function layer and a cover layer each having an outer diameter approximately equal to that of the substrate and an inner diameter larger than an outer diameter of the center hole, are stacked on the substrate, and as a separate entity from the cover layer, a clamp portion which is for holding and fixing the substrate and which has an outer diameter smaller than inner diameters of the recording-retrieving function layer and the cover layer, is provided around the center hole in a region where the cover layer is not formed.Type: ApplicationFiled: August 18, 2004Publication date: February 24, 2005Applicants: Hitachi Maxell, Ltd., MITSUBISHI CHEMICAL CORPORATION, Mitsubishi Kagaku Media Corporation, Ltd.Inventors: Jun Kanehira, Osamu Ishizaki
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Patent number: 5530641Abstract: A recording film of a recording medium has tracks with a track pitch of 1.6 .mu.m. Each track has a land and a groove, and the width of each of the land and groove is about 0.8 .mu.m. The groove and land differ relatively in height by a degree corresponding to (2n-1)/4 (n: a natural number) times the wavelength of the irradiated beam. At the time of reproduction, reflected diffraction beam components reflected from the land and groove are provided with a phase difference .pi.. Thus, a peak of the diffraction beam is concentrated within the range of the NA of an objective lens, with high intensity. As a result, the presence/absence of pits located at a distance less than a diffraction limit, which have not been detected in the prior art, can be detected.Type: GrantFiled: April 25, 1994Date of Patent: June 25, 1996Assignee: Olympus Optical Co., Ltd.Inventor: Jun Kanehira
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Patent number: 5202878Abstract: According to the present invention, recording laser beam is shot from a semiconductor laser to form a mark set which comprises a pair of marks on the track of an optical recording medium in the track width direction thereof and first information which has been coded corresponding to the interval between the paired marks in the mark set is recorded on the track of the optical recording medium. At the same time, the plural mark sets are formed on the track of the optical recording medium in the track length direction thereof and second information which has been coded corresponding to the interval between these mark sets is recorded on the track of the optical recording medium. The track of the optical recording medium is scanned in the track width direction thereof with reproducing laser beam shot from a semiconductor laser and .+-. first-order diffraction beam of an optical interference pattern which is created from the paired marks in the mark set thus scanned is detected to reproduce the first information.Type: GrantFiled: May 21, 1991Date of Patent: April 13, 1993Assignee: Olympus Optical Co., Ltd.Inventors: Jun Kanehira, Naoyuki Ueno
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Patent number: 5019476Abstract: An optical recording medium such as an optical disk, which is capable of reversibly repeating a recording/erasing cycle. This optical recording medium comprises a transparent substrate and recording layer formed on the substrate. This recording layer comprise a liquid crystalline high polymer having side chains and a dyestuff having a recording-light absorbing property. The side chain may preferably comprises mesogen group, a monocyclic or polycyclic compound such as phenyl, benzyl, naphthyl or anthryl group, and alkyl or aryl group having 1 to 18 carbon atoms.Type: GrantFiled: November 13, 1989Date of Patent: May 28, 1991Assignee: Olympus Optical Co., Ltd.Inventors: Toshiyuki Kanno, Naoyuki Ueno, Seiji Kondo, Yasuji Nagata, Jun Kanehira, Hideshi Takahashi, Yoshiko Uematsu
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Patent number: 4440585Abstract: An amorphous magnetic alloy having the formula Co.sub.x M.sub.y B.sub.z wherein M is zirconium, hafnium and/or titanium. When M is hafnium or zirconium 70.ltoreq.x.ltoreq.80, 8.ltoreq.y.ltoreq.15 and 10.ltoreq.z.ltoreq.16. When M is titanium, 70.ltoreq.x.ltoreq.72, 16.ltoreq.y.ltoreq.25 and 4.ltoreq.z.ltoreq.10. When M is hafnium together with titanium and/or zirconium, 70.ltoreq.x.ltoreq.80, 8.ltoreq.y.ltoreq.20 and 5.ltoreq.z.ltoreq.16.Type: GrantFiled: January 4, 1983Date of Patent: April 3, 1984Assignee: Olympus Optical Co., Ltd.Inventor: Jun Kanehira