Patents by Inventor Tsutomu Aoyama
Tsutomu Aoyama 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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Publication number: 20120127610Abstract: A magnetic recording method for a recording layer of a magnetic recording medium uses a thin film magnetic head with a sub-coil or a microwave radiator. In the method, a microwave spread spectrum (SS) signal is applied to the sub-coil or the microwave radiator, the microwave SS signal including a ferromagnetic resonant (FMR) frequency of the recording layer as a carrier wave within a band so as to generate an in-plane high-frequency magnetic field so that a magnetization reversal magnetic field Hsw of the recording layer is lowered. The magnetic recording is performed while the magnetization reversal magnetic field Hsw of the recording layer is lowered.Type: ApplicationFiled: November 16, 2011Publication date: May 24, 2012Applicant: TDK CORPORATIONInventors: Tsutomu AOYAMA, Hiroshi Ikeda, Isamu Sato
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Publication number: 20120100399Abstract: A battery unit includes: a main accommodation casing that includes a power output terminal; at least one sub-module that is accommodated in the main accommodation casing; and a control unit that is accommodated in the main accommodation casing and controls at least one of charging and discharging of a unit battery, wherein in the sub-module, two or more battery blocks are accommodated inside a sub-accommodation casing so that the terminals of the battery blocks each including a plurality of unit batteries are not exposed and the battery blocks are connected to each other through an electric connection member.Type: ApplicationFiled: October 19, 2011Publication date: April 26, 2012Applicant: SONY CORPORATIONInventors: Tatsuya Adachi, Tsutomu Aoyama
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Publication number: 20120064383Abstract: A battery unit includes a battery cell that charges and discharges electric power; and a bracket that has an outer peripheral wall portion surrounding an outer peripheral side of the battery cell, and a support body which is provided inside the outer peripheral wall portion and supports the battery cell, wherein two battery cells are inserted from a front surface side and a back surface side of the bracket into the outer peripheral wall portion and are mounted on both side surfaces of the support body.Type: ApplicationFiled: August 31, 2011Publication date: March 15, 2012Applicant: SONY CORPORATIONInventors: Yasuhiro Tonomura, Tsutomu Aoyama, Tatsuya Adachi, Ryota Isshiki, Tetsuo Inakawa, Munenori Inden, Ryo Tanabe, Tsuyoshi Toukairin
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Publication number: 20110293998Abstract: In one example embodiment, a battery unit includes a battery case, and a plurality of battery blocks stored in the battery case. The plurality of battery blocks are electrically connected together in series. In one example embodiment, a first plurality of the battery blocks form a first column and are arranged in a side-to-side configuration. In one example embodiment, a second plurality of the battery blocks form a second column and are arranged in an end-to-end configuration which is different from the side-to-side configuration.Type: ApplicationFiled: May 23, 2011Publication date: December 1, 2011Applicant: SONY CORPORATIONInventors: Bunya Sato, Tatsuya Adachi, Hiroshi Kano, Tsutomu Aoyama, Tsuyoshi Toukairin, Akira Sanpei
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Patent number: 8068398Abstract: A recording method suitable for high-density recording is provided. When information is recorded on an optical recording medium with irradiation of a write pulse of a laser beam, a length corresponding to 7 T is set to be equal to or less than the spot diameter ?/NA of the laser beam where T is one recording clock cycle, ? is a wavelength of the laser beam, and NA is a numerical aperture of the objective lens, and a specified mark with a length corresponding to 3 T or more is recorded by a single write pulse.Type: GrantFiled: July 23, 2007Date of Patent: November 29, 2011Assignee: TDK CorporationInventors: Tsutomu Aoyama, Tatsuya Kato
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Publication number: 20110248710Abstract: A measuring circuit system in a magnetic field measuring apparatus of the invention has an amplifier and a band-pass filter connected in sequence on an output terminal side of the TMR element, the band-pass filter is a narrow-range band-pass filter such that a peak pass frequency of the filter that is a center is a basic frequency selected from a range of 10 to 40 GHz and a band width centered around the basic frequency is a narrow range of ±0.5 to ±4 GHz; and with the measuring circuit system, an SIN ratio (SNR) of 3 dB or greater is obtained, the SNR being defined by a ratio of an amplitude S of a high-frequency generated signal induced by the TMR element to a total noise N that is a sum of a head noise generated by the TMR element and a circuit noise generated by the amplifier. With such a configuration, an in-plane high-frequency magnetic field generated by a microwave-assisted magnetic head is reliably and precisely measured.Type: ApplicationFiled: April 7, 2010Publication date: October 13, 2011Applicant: TDK CORPORATIONInventors: Isamu SATO, Hiroshi Ikeda, Mikio Matsuzaki, Tetsuya Roppongi, Noboru Yamanaka, Tsutomu Aoyama
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Publication number: 20110242696Abstract: A gap between a main pole and auxiliary pole composing a thin film magnetic head having a microwave assisted function of the present invention is filled with a nonmagnetic dielectric layer to embed a microwave radiator. The nonmagnetic dielectric layer has an inclined surface at a end on a side of an opposing medium surface by which the microwave radiated from the microwave radiator to be bent toward the main pole, whereby the microwave magnetic field generated from the microwave generator can be gathered immediately below the main pole, further improving the microwave assisted effect.Type: ApplicationFiled: March 31, 2010Publication date: October 6, 2011Applicant: TDK CORPORATIONInventors: Hiroshi IKEDA, Isamu Sato, Kiyoshi Noguchi, Tsutomu Aoyama, Takuya Adachi
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Publication number: 20100260026Abstract: In a multi-layer optical disc, having three (3) or more recording layers thereof, for enabling an easy focus lead-in operation onto a desired recording layer, reflectivity of respective recording layers are so determined that a ratio between the reflectivity of the desired recording layer and the reflectivity of other recording layers is equal or greater than a predetermined value, upon basis of the reflectivity of the other recording layers.Type: ApplicationFiled: May 15, 2008Publication date: October 14, 2010Inventors: Yoshinori Ishikawa, Koji Mishima, Tsutomu Aoyama, Takashi Kikukawa
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Patent number: 7787334Abstract: When there is a defect area in a specific recording layer, recording of information is continued and reduction in a recording rate is restrained. In an optical recording method for recording information on a multilayer optical recording medium having a plurality of recording layers by irradiating the recording layer with a beam spot, any recording layer is set as an escape recording layer. When a defect area is detected while information is recorded on another recording layer except for the escape recording layer, the beam spot moves to the escape recording layer to continue recording the information.Type: GrantFiled: November 30, 2007Date of Patent: August 31, 2010Assignee: TDK CorporationInventors: Takashi Kikukawa, Koji Mishima, Tsutomu Aoyama, Hidetake Itoh
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Publication number: 20100074084Abstract: An optical recording medium which includes three or more information layers and has a higher stack density of information layers than before in the direction of thickness while reducing crosstalk during reproduction, and a method for reading the optical recording medium are provided. The optical recording medium has a three-layer structure which includes a substrate, a first information layer, a first spacer layer, a second information layer, a second spacer layer, a third information layer, and a cover layer thinner than the substrate, with these layers being stacked in that order over the substrate, wherein the following Equation (I) is satisfied: (R2×R3×R2)/R1?0.0032 ??Equation (I) where R1 is the reflectivity of the first information layer, R2 is the reflectivity of the second information layer, and R3 is the reflectivity of the third information layer, and the first spacer layer and the second spacer layer are equal to each other in thickness.Type: ApplicationFiled: April 16, 2008Publication date: March 25, 2010Applicant: TDK CORPORATIONInventors: Koji Mishima, Tsutomu Aoyama, Takashi Kikukawa
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Publication number: 20080130444Abstract: When there is a defect area in a specific recording layer, recording of information is continued and reduction in a recording rate is restrained. In an optical recording method for recording information on a multilayer optical recording medium having a plurality of recording layers by irradiating the recording layer with a beam spot, any recording layer is set as an escape recording layer. When a defect area is detected while information is recorded on another recording layer except for the escape recording layer, the beam spot moves to the escape recording layer to continue recording the information.Type: ApplicationFiled: November 30, 2007Publication date: June 5, 2008Inventors: Takashi Kikukawa, Koji Mishima, Tsutomu Aoyama, Hidetake Itoh
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Publication number: 20080025181Abstract: A recording method suitable for high-density recording is provided. When information is recorded on an optical recording medium with irradiation of a write pulse of a laser beam, a length corresponding to 7 T is set to be equal to or less than the spot diameter ?/NA of the laser beam where T is one recording clock cycle, ? is a wavelength of the laser beam, and NA is a numerical aperture of the objective lens, and a specified mark with a length corresponding to 3 T or more is recorded by a single write pulse.Type: ApplicationFiled: July 23, 2007Publication date: January 31, 2008Inventors: Tsutomu Aoyama, Tatsuya Kato
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Publication number: 20080025180Abstract: A recording method suitable for high-density recording is provided to increase the reproduction quality. An optical information recording method is for recording information on an optical recording medium by irradiation of a write pulse of a laser beam to perform reproduction in a production system using a PRML detection scheme. The method includes recording a recording mark by a single write pulse, when the total length of the recording mark to be recorded and a space adjacent to the recording mark is less than a diameter of an effective reproduction spot, being 0.82×(?/NA), where ? is a wavelength of a reproduction laser beam and NA is a numerical aperture.Type: ApplicationFiled: July 23, 2007Publication date: January 31, 2008Inventors: Tsutomu Aoyama, Tatsuya Kato
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Publication number: 20070291621Abstract: A method is provided to enable efficient optimization of write pulse waveforms using a trial writing region. To record information on an optical recording medium using a laser beam, the method includes: recording a specific pattern of multiple record marks on the trial writing region of the optical recording medium; decoding a read signal from the specific pattern using a PRML detection method; and tuning a write pulse waveform for forming the record marks based on the quality of decoded data determined by the PRML detection method.Type: ApplicationFiled: May 23, 2007Publication date: December 20, 2007Inventors: Tsutomu Aoyama, Tatsuya Kato
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Publication number: 20070274185Abstract: An optical disc has a data management area in a region on a radially inward side. Management information is recorded in the data management area as recording marks and spaces. The optical disc also has a data recording area on the outside of the data management area. Data to be read is recoded in the data recording area as recording marks and spaces. The information readout density of the data recording area is higher than that of the data management area. The read power of a readout laser beam during readout can be set smaller in the data management area than in the data recording area. In this manner, the read stability is significantly increased without reducing the information readout density.Type: ApplicationFiled: May 14, 2007Publication date: November 29, 2007Applicant: TDK CORPORATIONInventors: Takashi Kikukawa, Narutoshi Fukuzawa, Tatsuhiro Kobayashi, Tsutomu Aoyama
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Publication number: 20070231682Abstract: A battery pack is disclosed. The battery pack includes one or more battery assemblies and a circuit board connected to the battery assemblies. The battery assembly includes first and second battery cells having the predetermined surfaces overlaid on each other. The first and second battery cells each have battery elements accommodated in a container thereof, and cathode terminals and anode terminals are provided at a same height as the predetermined surfaces at a same side. The cathode terminal and anode terminal of the first battery cell are adjacent respectively to the cathode terminal and anode terminal of the second battery cell.Type: ApplicationFiled: April 2, 2007Publication date: October 4, 2007Applicant: SONY CORPORATIONInventors: Tsutomu Aoyama, Hiromasa Iguchi, Hiroyuki Yamada, Takanori Takei
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Publication number: 20070206482Abstract: When the recording capacity of an optical recording medium is increased, both reproduction characteristics and a tilt margin are improved. Specifically, when a laser beam is projected onto an information recording layer of the optical recording medium to reproduce information, a laser beam having a wavelength of 400 to 410 nm is employed. In addition, an objective lens which converges the laser beam and has a numerical aperture NA of 0.70 to 0.90 is employed. The reproduction is started by projecting the laser beam. A reproduction signal obtained by projecting the laser beam is decoded by means of a PRML detection method to generate reproduction data of the optical recording medium. When the quality of the reproduction data deteriorates, the power of the laser beam is temporarily increased.Type: ApplicationFiled: March 2, 2007Publication date: September 6, 2007Inventors: Tsutomu Aoyama, Toshiki Aoi
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Patent number: 7141330Abstract: The present invention is designed to provide a secondary battery accommodation case with improved exterior surface having no parting line in two or more exterior faces out of four exterior faces encircling the battery accommodation portion. It comprises a substantially rectangular bottom case 11 having a battery accommodation portion 18 for accommodating secondary batteries 13 and a top case 12 to be assembled with the bottom case 11 for closing the battery accommodation portion 18. In the assembled condition of the top case 12 and the bottom case 11, the exterior face of the top case 12 closing the secondary battery accommodation portion 18 is made equal to or lower than two or more open edges 15a˜15d out of four exterior faces 11b˜11e encircling the battery accommodation portion 18 in the bottom case 11.Type: GrantFiled: March 4, 2003Date of Patent: November 28, 2006Assignee: Sony CorporationInventor: Tsutomu Aoyama
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Patent number: 7095589Abstract: A disc-shaped magnetic recording medium has magnetic tracks that are arranged thereon substantially concentrically for writing and reading magnetic information. Assuming that a saturation magnetic field in a width direction extending in a radial direction from the center of the disc-shaped magnetic recording medium is HR, and a saturation magnetic field in a circumferential direction perpendicular to the radial direction is HC, HR/HC is set to a value within a range of 0.5 to 0.95 in each of the magnetic tracks, and magnetization information is recorded in the width direction of each magnetic track. In gap portions between the magnetic tracks located adjacent to each other in the radial direction, discrete portions for magnetically separating the adjacent magnetic tracks are formed, respectively. With this configuration, it is possible to realize recording and reproduction in the magnetic track width direction.Type: GrantFiled: November 19, 2003Date of Patent: August 22, 2006Assignee: TDK CorporationInventor: Tsutomu Aoyama
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Publication number: 20050220990Abstract: An Ag ion 6 is locally implanted into a thin film 4 containing, as main components, at least one of Fe and Co and at least one of Pd and Pt and a heat treatment is then carried out, and a portion 7 into which the Ag ion 6 is implanted becomes a portion 9 having a large coercive force and a portion 8 into which the Ag ion 6 is not locally implanted becomes a portion 10 having a small coercive force.Type: ApplicationFiled: February 4, 2005Publication date: October 6, 2005Applicant: TDK CorporationInventors: Tsutomu Aoyama, Shunji Ishio, Hirotaka Ito