Patents by Inventor Kanji Kawakami
Kanji Kawakami 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: 9502698Abstract: Provided is a non-aqueous electrolyte battery including: a power-generating element; and a battery container configured to house the power-generating element. The power-generating element includes: a positive electrode; a negative electrode; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The battery container includes: a battery case having an opening; a sealing plate configured to close the opening; and a gasket interposed between the battery case and the sealing plate. The gasket includes a PFA resin being a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and at least a part of the PFA resin has undergone a melting treatment 2 to 20 times to be a first component. The melting treatment includes heating the PFA resin to a melting temperature of 310° C. to 450° C. for melting and then cooling the PFA resin back to a solid.Type: GrantFiled: September 20, 2013Date of Patent: November 22, 2016Assignee: Panasonic Intellectual Property Management Co., Ltd.Inventors: Tadayoshi Takahashi, Kanji Kawakami
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Publication number: 20150243942Abstract: Provided is a non-aqueous electrolyte battery including: a power-generating element; and a battery container configured to house the power-generating element. The power-generating element includes: a positive electrode; a negative electrode; a separator interposed between the positive and negative electrodes; and a non-aqueous electrolyte. The battery container includes: a battery case having an opening; a sealing plate configured to close the opening; and a gasket interposed between the battery case and the sealing plate. The gasket includes a PFA resin being a copolymer of tetrafluoroethylene and perfluoroalkyl vinyl ether, and at least a part of the PFA resin has undergone a melting treatment 2 to 20 times to be a first component. The melting treatment includes heating the PFA resin to a melting temperature of 310° C. to 450° C. for melting and then cooling the PFA resin back to a solid.Type: ApplicationFiled: September 20, 2013Publication date: August 27, 2015Inventors: Tadayoshi Takahashi, Kanji Kawakami
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Publication number: 20080166631Abstract: A flat organic electrolyte secondary battery includes a negative electrode, a positive electrode, an organic electrolyte, a separator, a sealing plate, and a positive electrode can gasket. The negative electrode includes an oxide capable of reversibly absorbing and desorbing lithium ions as a negative electrode active material. The sealing plate is in contact with the negative electrode and serves as a negative electrode terminal. The gasket is interposed between the positive electrode can and the sealing plate. The gasket is composed of tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer resin having a heat deformation temperature of 70° C. or more at a load of 0.45 MPa and a heat deformation temperature of 60° C. or less at a load of 1.82 MPa.Type: ApplicationFiled: March 20, 2008Publication date: July 10, 2008Inventors: Tadayoshi TAKAHASHI, Hiroyuki AKIYA, Akira KAKINUMA, Kanji KAWAKAMI, Tuyoshi YANAGIMOTO
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Patent number: 6861992Abstract: In an antenna for communicating an electromagnetic wave, a first converger converges the electromagnetic wave. A second converger faces the first converger and includes a conductor plate having a through hole, into which a magnetic flux of the converged electromagnetic wave is converged. The through hole is formed at a center portion of the conductor plate so as to have a size which is sufficiently smaller than a wavelength of the electromagnetic wave. The conductor plate is formed with a cutout extending from a part of the through hole to an outer periphery of the conductor plate. A converter faces the through hole of the conductor plate to convert the converged magnetic flux into voltage.Type: GrantFiled: September 28, 2001Date of Patent: March 1, 2005Assignees: Hitachi Kokusai Electric Inc.Inventors: Kanji Kawakami, Iichi Wako, Nobuyuki Matsui, Yoshiaki Fukuda
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Publication number: 20020053992Abstract: In an antenna for communicating an electromagnetic wave, a first converger converges the electromagnetic wave. A second converger faces the first converger and includes a conductor plate having a through hole, into which a magnetic flux of the converged electromagnetic wave is converged. The through hole is formed at a center portion of the conductor plate so as to have a size which is sufficiently smaller than a wavelength of the electromagnetic wave. The conductor plate is formed with a cutout extending from a part of the through hole to an outer periphery of the conductor plate. A converter faces the through hole of the conductor plate to convert the converged magnetic flux into voltage.Type: ApplicationFiled: September 28, 2001Publication date: May 9, 2002Applicant: HITACHI KOKUSAI ELECTRIC INC.Inventors: Kanji Kawakami, Iichi Wako, Nobuyuki Matsui, Yoshiaki Fukuda
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Patent number: 5719729Abstract: In an inductive-write, magnetoresistive-read type magnetic head having a magnetoresistive read head and an inductive write head superimposed on each other, the magnetic center of the read head is made more coincident with the physical center of the write head by a changing of a magnetization direction of a magnetoresistive element. The recording/reproducing apparatus using this magnetic head can thus have a good S/N ratio even if the track width is narrow.Type: GrantFiled: December 15, 1992Date of Patent: February 17, 1998Assignee: Hitachi, Ltd.Inventors: Naoki Koyama, Yoshihiro Hamakawa, Isamu Yuitoo, Kanji Kawakami, Kazuo Shiiki, Masahiro Kitada
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Patent number: 5671107Abstract: A magnetic disc apparatus has a large recording density of 120 megabits per square inch or more, and defines a relationship among a pole thickness (Pt) of thin-film magnetic heads disposed in the magnetic disc apparatus, and a saturation flux density (Bs) of cores of the heads and a recording wavelength (.lambda.) for the thin film magnetic discs have a coercivity of 1800 Oe or more, wherein a levitation space between the head and the disc is 0.15 .mu.m or less.Type: GrantFiled: March 6, 1995Date of Patent: September 23, 1997Assignee: Hitachi, Ltd.Inventors: Katsuya Mitsuoka, Hiroshi Fukui, Makoto Aihara, Masanori Tanabe, Moriaki Fuyama, Shinji Narishige, Yutaka Sugita, Yoshihiro Shiroishi, Hajime Aoi, Yokuo Saitoh, Kanji Kawakami, Yoshikazu Tsuji, Masaaki Hayashi, Kazuo Nakagoshi
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Patent number: 5541789Abstract: A magnetic recording device includes a magnetic disk for storing information, a magnetic head for writing and reading information relative to the magnetic disk, a device for rotating the magnetic disk relative to the magnetic head in such a manner that speed of said magnetic disk relative to the magnetic head is 6 to 40 m/s at an innermost track of the magnetic disk, and a device for applying a load to the magnetic head so that a gap between the magnetic disk and the magnetic head disposed in opposed relation to the magnetic disk can be kept to not more than 0.1 .mu.m.Type: GrantFiled: May 26, 1995Date of Patent: July 30, 1996Assignee: Hitachi, Ltd.Inventors: Hirotsugu Fukuoka, Hiroshi Fukui, Mitsuo Suda, Yutaka Sugita, Kanji Kawakami
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Patent number: 5307214Abstract: A magnetic recording apparatus for recording information on a magnetic recording medium. A circuit for generates a recording current pulse train and supplies the pulse train to a magnetic head. The last pulse of the recording current pulse train dampled waveform. A ripple current is superposed on the damped waveform.Type: GrantFiled: March 9, 1992Date of Patent: April 26, 1994Assignee: Hitachi, Ltd.Inventors: Kanji Kawakami, Yoshiakira Karakama, Masayuki Takagi, Takayoshi Ohtsu, Hisayasu Honma, Tetsuo Kobayashi, Yutaka Sugita, Katsuya Mitsuoka
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Patent number: 5251083Abstract: A flying head slider has a slider body in which gas bearing rails are formed on a surface thereof disposed in opposed relation to a recording medium. A bleed portion is also provided at the surface of the slider body between a pair of gas bearing rails. The bleed portion is composed of at least a rectangular-shaped deep bleed portion in which the pair of longer sides thereof are directioned in parallel to the longitudinal axis direction of the gas bearing rails.Type: GrantFiled: June 8, 1992Date of Patent: October 5, 1993Assignee: Hitachi, Ltd.Inventors: Yoshinori Takeuchi, Yuzo Yamaguchi, Fumitaka Muranushi, Katsuyuki Tanaka, Kanji Kawakami, Hiroshi Daito, Tetsuo Masukawa
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Patent number: 5245493Abstract: A magnetic head for reading from and/or writing to a magnetic information storage medium has a substrate on which a plurality of thin films are formed in sequence. The films provide a magnetic circuit having a magnetic gap, a bottom pole piece and a top pole piece overlying said bottom pole piece. The top pole piece is formed as a tip portion adjoining the magnetic gap and a rear portion which makes magnetic contact with the tip portion. The rear portion is formed in the sequence after the tip portion. To ensure accurate thickness and width of the tip portion, a non-magnetic protective film is formed on the tip portion after the tip portion is formed and before the rear portion is formed.Type: GrantFiled: March 20, 1990Date of Patent: September 14, 1993Assignee: Hitachi, Ltd.Inventors: Takashi Kawabe, Moriaki Fuyama, Shinji Narishige, Eizi Ashida, Makoto Morijiri, Masanori Tanabe, Hiroshi Fukui, Yutaka Sugita, Hiroshi Ikeda, Masaaki Hayashi, Kazuo Nakagoshi, Kanji Kawakami, Yokuo Saitoh, Shunichiro Kuwatsuka
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Patent number: 5128821Abstract: A flying head slider has gas bearing rails formed on a surface thereof disposed in opposed relation to a recording medium. The flying head slider flies at a microscopic distance above the recording medium by a pressure produced by a stream of gas resulted from the rotation of the recording medium. Each of the gas bearing rails comprises an inflow portion disposed at an inflow side of the gas stream so as to produce a pressure, an outflow portion disposed at an outflow side of the gas stream so as to produce a pressure, and a connective portion interconnecting the inflow portion and the outflow portion in a common plane. The connective portion serves to suppress an excessive compression of the gas, and achieves good damping characteristics.Type: GrantFiled: May 29, 1990Date of Patent: July 7, 1992Assignee: Hitachi, Ltd.Inventors: Yoshinori Takeuchi, Yuzo Yamaguchi, Fumitaka Muranushi, Katsuyuki Tanaka, Kanji Kawakami, Hiroshi Daito, Tetsuo Masukawa
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Patent number: 5079662Abstract: A compound magnetic head includes first and second magnetic poles arranged to face each other to define a recording gap therebetween, a magnetic film arranged between the first and second magnetic poles, a first non-magnetic film arranged between the first magnetic pole and the magnetic film to define a first reproducing gap therebetween, and a second non-magnetic film arranged between the second magnetic pole and the magnetic pole to define a second reproducing gap therebetween. The recording gap and the first and second reproducing gaps have the same width and a common center line of the gap widths parallel to the direction of movement of a magnetic recording medium.Type: GrantFiled: September 27, 1989Date of Patent: January 7, 1992Assignee: Hitachi, Ltd.Inventors: Kanji Kawakami, Yokuo Saitoh, Tetsuo Kobayashi, Takayoshi Ohtsu, Hiroshi Fukui, Yamagata, deceased, Koji, by Tetsuji Yamagata, legal representative, by Reiko Yamagata, legal representative
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Patent number: 4949209Abstract: In a thin-film magnetic head having a magnetic core (upper magnetic layer), in the electromagnetic conversion section, which are composed of an upper first magnetic film, inorganic insulating film, and an upper second magnetic film, the upper first magnetic film is used as a second wiring for electrical continuity between the coil and input/output terminal. The upper first magnetic film is connected to the center of a coil which is of a single-layer structure. The first upper magnetic film is made of a same material as the coil and is formed simultaneously with the latter. In the region in which an input/output terminal backing is formed, the upper first magnetic film of a second wiring is removed. Thus, the electrical continuity is established between the input/output terminal and the center of the coil.Also, the utilization of the upper first magnetic film as second wiring is applicable to a thin-film magnetic head having a coil of a multi-layer structure.Type: GrantFiled: August 12, 1988Date of Patent: August 14, 1990Assignee: Hitachi, Ltd.Inventors: Tadashi Imanaka, Tetsuo Kobayashi, Harunobu Saito, Osamu Hirai, Kanji Kawakami
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Patent number: 4861398Abstract: DC bias currents are applied to a conducting wire of a thin film magnetic head to be inspected. When the DC bias currents (I.sub.0, I.sub.1, I.sub.2) are supplied to the conducting wire, the impedances (Z.sub.0, Z.sub.1, Z.sub.2) corresponding to the DC bias currents are measured. When a ratio (.vertline.Z.sub.1 -Z.sub.0 .vertline./.vertline.Z.sub.2 -Z.sub.0 .vertline.) corresponding to an overwrite characteristic (OW) reaches to a predetermined value by lapping tip portions of an upper magnetic layer and a lower magnetic layer of the magnetic head, the lapping process of the magnetic head is finished.Type: GrantFiled: November 20, 1987Date of Patent: August 29, 1989Assignee: Hitachi, Ltd.Inventors: Hirotsugu Fukuoka, Kanji Kawakami, Makoto Aihara, Mitsuo Suda, Kouji Takeshita, Yukihiro Isono
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Patent number: 4773060Abstract: A film of a crystal - crystal phase transformation type optical recording alloy is formed on an insulating substrate. Information is erased from the alloy film by heating it with an expedient other than a laser beam. Information is read by sensing reflected light of light projected on the alloy film.Type: GrantFiled: December 3, 1985Date of Patent: September 20, 1988Assignee: Hitachi, Ltd.Inventors: Satoshi Shimada, Yoshio Sato, Hiroshi Sasaki, Nobuyoshi Tsuboi, Tetsuo Ito, Hideki Nihei, Norifumi Miyamoto, Hiroaki Koyanagi, Kanji Kawakami
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Patent number: 4760102Abstract: A porous polytetrafluoroethylene material produced by forming a mixture of an adequate amount of a liquid lubricant and polytetrafluoroethylene fine powder having an average molecular weight of at least 6,000,000, an amorphous index larger than 0.1 and a number average primary particle size of 0.1 to 0.8 microns, and a clear endothermic peak at a temperature of 347.+-.3.degree. C. and an another endothermic peak or shoulder at a temperature between 330.degree. C. and the temperature of said clear endothermic peak on a crystalline melting chart recorded by a differential scanning calorimeter, removing the lubricant to obtain an unsintered PTFE material and expanding the unsintered polytetrafluoroethylene material at least monoaxially at a temperature higher than the melting point of polytetrafluoroethylene.Type: GrantFiled: July 15, 1986Date of Patent: July 26, 1988Assignees: Nitto Electric Industrial Co., Ltd., Daikin Kogyo Co., Ltd.Inventors: Yasuhiro Moriyama, Shoji Suzuki, Atsuo Yoshimura, Kanji Kawakami, Jyuzaemon Hoashi, Syozo Fumoto, Kiyoshi Oshita
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Patent number: 4689652Abstract: An image sensor comprises a transparent substrate, an optical lens formed integrally in one major surface of the transparent substrate, and a photosensor provided on the side of the other major surface of the transparent substrate and having output electrodes, wherein light incident on the optical lens is focussed by the lens onto the photosensor through the transparent substrate.Type: GrantFiled: March 11, 1985Date of Patent: August 25, 1987Assignee: Hitachi, Ltd.Inventors: Satoshi Shimada, Kanji Kawakami, Masaharu Tadauchi, Motohisa Nishihara
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Patent number: 4670969Abstract: A method of making a silicon diaphragm pressure sensor includes forming an oxide film on one surface of a monocrystalline silicon substrate. A polycrystalline silicon layer is formed on the oxide film. The oxide film may be partly removed before the formation of the polycrystalline silicon layer. The polycrystalline silicon layer is heated and melt to recrystallize the same, thereby converting the polycrystalline silicon layer into a monocrystalline silicon layer. On the monocrystalline silicon layer may be epitaxially grown an additional monocrystalline silicon layer. By using the oxide film as an etching stopper, a predetermined portion of the substrate is etched over a range from the other surface of the substrate to the oxide film, thereby providing a diaphragm of the pressure sensor.Type: GrantFiled: January 25, 1985Date of Patent: June 9, 1987Assignee: Hitachi, Ltd.Inventors: Kazuji Yamada, Yutaka Kobayashi, Kanji Kawakami, Satoshi Shimada, Masanori Tanabe, Shigeyuki Kobori
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Patent number: 4665282Abstract: A tablet type coordinate input apparatus comprises a flat medium for propagating a longitudinal elastic wave, longitudinal elastic wave detecting elements disposed on part of the end-adjacent side surfaces or of the front surface of the flat medium, a longitudinal elastic wave input member having an end portion terminating in a sharp-pointed end and brought into pressure engagement at that end with any desired position on the surface of the flat medium to radiate the longitudinal elastic wave from that end, an amplifier circuit amplifying electrical signals indicative of the elastic wave detected by the detecting elements, a comparator circuit comparing the signals amplified by the amplifier circuit with a predetermined threshold voltage thereby generating delay pulse signals corresponding to the propagation times of the longitudinal elastic wave, a counter circuit counting the lengths of time elapsed from the time of radiation of the longitudinal elastic wave toward the flat medium as a result of pressure enType: GrantFiled: July 24, 1985Date of Patent: May 12, 1987Assignee: Hitachi, Ltd.Inventors: Ichiya Sato, Takao Yoneyama, Masanori Tanabe, Kanji Kawakami, Hisao Okada, Soji Sasaki, Shigeru Inose, Mareo Suto, Hideo Uzuhashi