Patents by Inventor Masaaki Yamada
Masaaki Yamada 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: 20150338824Abstract: A developing device includes a developer bearer to carry, by rotation, developer including toner and magnetic carrier to a developing range facing a latent image bearer; a casing including a developer container and an opening to expose a part of the developer bearer disposed in the casing; an opposing face of the casing including a conductive material and opposing to a surface of the developer bearer downstream from the developing range in a direction of rotation of the developer bearer; a developing bias source to apply a developing bias to the developer bearer; and an insulation layer disposed on the opposing face of the casing. The opposing face is disposed across, from the developer bearer, a casing gap sized to allow the developer borne on the developer bearer to contact the opposing face.Type: ApplicationFiled: May 22, 2015Publication date: November 26, 2015Applicant: RICOH COMPANY, LTD.Inventors: Yasunobu Shimizu, Akira Azami, Masaaki Yamada, Yoshiko Ogawa, Toshio Koike, Mutsuki Morinaga, Yutaka Takahashi, Keinosuke Kondoh, Kentaro Mikuniya, Yoshiharu Kishi
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Publication number: 20150310756Abstract: A learner's terminal is provided with a time acquiring unit for acquiring time, an input unit capable of carrying out a handwriting input, and answer input history data notifying unit for use in notifying a school server of the time acquired by the time acquiring unit and handwriting input data inputted thereto by the input unit as answer input history data, and the school server is provided with an answer input history data storage unit for storing the answer input history data notified by the learner's terminal and an answer input history data transmitting unit for transmitting the answer input history data stored in the answer input history data storage unit to an instructor's terminal, while the instructor's terminal is provided with an answer screen display unit for displaying a screen at the time of answering in time series based upon the answer input history data transmitted by the answer input history data transmitting unit.Type: ApplicationFiled: September 12, 2012Publication date: October 29, 2015Inventors: Hideki NAKAMURA, Tetsuo NAKANO, Katsuya MIYATA, Yusaku KATSUBE, Masaaki YAMADA
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Publication number: 20150177646Abstract: A device that estimates carrier deterioration indicating a degree of deterioration of carrier inside a developing device using a two-component developer includes a first carrier deterioration calculation unit, a second carrier deterioration calculation unit, and a carrier deterioration degree output unit. The first carrier deterioration calculation unit uses toner consumption and agitation time to calculate a first carrier deterioration degree indicating a degree of carrier deterioration caused by a spent phenomenon. The second carrier deterioration calculation unit uses the toner consumption and the agitation time to calculate a second carrier deterioration degree indicating a degree of carrier deterioration caused by a carrier abrasion phenomenon. The carrier deterioration degree output unit uses the toner consumption to select one of the first carrier deterioration degree and the second carrier deterioration degree, and outputs the selected carrier deterioration degree.Type: ApplicationFiled: December 12, 2014Publication date: June 25, 2015Inventors: Masaaki YAMADA, Akira AZAMI, Atsushi TANO, Mutsuki MORINAGA, Emiko SHIRAISHI, Hiroaki KUWABARA
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Patent number: 9046821Abstract: A developing device to develop with two-component developer an electrostatic latent image includes a developer bearer to carry thereon developer supplied to the latent image bearer, a first conveyance channel disposed adjacent to the developer bearer, a second conveyance channel disposed adjacent to the first conveyance channel and farther from the developer bearer than the first conveyance channel, a first conveying member disposed in the first conveyance channel to agitate and transport developer supplied to the developer bearer, a second conveying member including a spiral blade winding around a shaft to transport developer in the second conveyance channel in a predetermined developer conveyance direction, and a collected-developer guide to guide a part of developer that leaves the developer bearer to the second conveyance channel beyond the first conveyance channel.Type: GrantFiled: October 22, 2013Date of Patent: June 2, 2015Assignee: Ricoh Company, Ltd.Inventors: Tomoya Ohmura, Akira Azami, Toshio Koike, Masaaki Yamada, Hiroaki Okamoto
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Patent number: 9008556Abstract: A development device includes a developer bearer to carry developer thereon and receive a development bias and a developer regulator to adjust an amount of developer carried on the developer bearer. Multiple recesses recessed from a reference surface area are formed in a surface of the developer bearer, the developer bearer includes a conductive base in which the recesses are formed, and the conductive base in the reference surface area is coated with an insulative surface layer.Type: GrantFiled: March 13, 2013Date of Patent: April 14, 2015Assignee: Ricoh Company, Ltd.Inventors: Yuuji Ishikura, Katsuhiro Aoki, Masaaki Yamada, Masayuki Yamane, Atsushi Kurokawa, Yuuki Satoh
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Patent number: 8982086Abstract: An information processing apparatus includes a touch panel which displays pieces of identification information including letters, figures, and symbols and detects a contact of the panel with a finger of a user or other object. When the touch panel detects the contact of the panel, a detection unit specifies identification information of one or more of the multiple pieces of identification information displayed on the touch panel, indicated by a position at which the contact in question occurred. The detection unit also detects an area of part of the panel where the contact occurred. A storage unit stores reference identification information and a reference area range. A control unit performs particular processing upon matching of the detected identification information with the stored reference identification information and the area of the contact detected by the detection unit falling within the stored reference area range.Type: GrantFiled: January 14, 2014Date of Patent: March 17, 2015Assignee: Hitachi Maxell, Ltd.Inventor: Masaaki Yamada
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Patent number: 8948638Abstract: An image forming apparatus includes a latent image carrier; a latent image writer to write a latent image on the latent image carrier; a developing unit including a toner carrier having first and second electrodes insulated via an insulator member and a voltage applying unit to apply voltages to the first and second electrodes having a potential difference to generate first electric fields to cause the toner to hop from the toner carrier to the latent image carrier to develop a toner image; and a transfer unit to transfer the developed toner image to a transferring member. When alternating voltages having a same phase and same amplitude are applied to the first and second electrodes to form second electric fields between the latent image carrier and the toner carrier, the toner is discharged from the toner carrier to the latent image carrier in a toner discharge mode.Type: GrantFiled: August 23, 2011Date of Patent: February 3, 2015Assignee: Ricoh Company, Ltd.Inventors: Yuji Ishikura, Yasuyuki Ishii, Hideki Kosugi, Tetsuro Hirota, Masaaki Yamada, Yoshiko Ogawa, Atsushi Kurokawa, Hideyasu Seki, Masanori Horike, Shin Kayahara
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Patent number: 8897681Abstract: An image forming apparatus includes a latent image carrier to carry a latent image, a developing device having a toner carrier with first and second electrodes to develop the latent image by transferring the toner to a developing region between the toner carrier and the latent image carrier while causing the toner to hop between the first and second electrodes and attaching the hopping toner to the latent image, a pulsed power supply to output a first periodic pulse voltage having a mean potential the same as a normal toner charge and a second periodic pulse voltage, a smoothing circuit to make the first periodic pulse voltage smooth to generate a direct voltage, and a toner layer thickness regulator member to regulate, on receiving the direct voltage, a thickness of the toner layer in a region between a toner supply position at which toner is supplied and the developing region.Type: GrantFiled: August 31, 2011Date of Patent: November 25, 2014Assignee: Ricoh Company, Ltd.Inventors: Tetsuro Hirota, Hideki Kosugi, Masaaki Yamada, Atsushi Kurokawa, Hideyasu Seki, Yasuyuki Ishii
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Patent number: 8872984Abstract: Provided is an LTE-system mobile communication terminal in which a reduction in terminal size and a reduction in the number of components is desired when a terrestrial digital television broadcast is to be received. Two antennas from among terrestrial digital television broadcast receiving antennas are switched and controlled so as to also be used as transmitting/receiving antennas from LTE communication, and the reception diversity is switched to either a 2-system combination or 4-system combination in accordance with whether the television broadcast is in the VHF band or UHF band. As a result, the number of antennas for example can be reduced and the terminal costs and size can be reduced.Type: GrantFiled: March 29, 2012Date of Patent: October 28, 2014Assignee: TKR Corporation Co., Ltd.Inventors: Yoshikazu Sugiyama, Masaaki Yamada
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Patent number: 8838048Abstract: A combination of antennas to be used is selected based on a distance between a plurality of antennas or the polarization direction of a radio signal to be transmitted/received.Type: GrantFiled: March 27, 2013Date of Patent: September 16, 2014Assignee: NEC Casio Mobile Communications, Ltd.Inventors: Masaaki Yamada, Mitsuhiro Kitani
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Patent number: 8824935Abstract: A development device includes a developer container; a rotary cylindrical developer carrier including an outer electrode including multiple electrode portions arranged in a circumferential direction of the developer carrier, an inner electrode provided on an inner circumferential side of the developer carrier from the outer electrode, an insulation layer disposed between the outer electrode and the inner electrode, and a surface layer; and a bias power source to apply a first bias voltage and a second bias voltage to the inner electrode and the outer electrode, respectively. The first bias power source causes an electrical potential difference that changes with time between the inner electrode and the outer electrode to cause the developer to hop on a circumferential surface of the developer carrier. At least one of the first bias voltage and the second bias voltage has a cyclic waveform in which pulse-on time is reduced.Type: GrantFiled: September 6, 2011Date of Patent: September 2, 2014Assignee: Ricoh Company, Ltd.Inventors: Hideyasu Seki, Yasuyuki Ishii, Hideki Kosugi, Tetsuro Hirota, Masaaki Yamada, Atsushi Kurokawa
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Patent number: 8792838Abstract: A combination of antennas to be used is selected based on a distance between a plurality of antennas or the polarization direction of a radio signal to be transmitted/received.Type: GrantFiled: November 1, 2010Date of Patent: July 29, 2014Assignee: NEC Casio Mobile Communications, Ltd.Inventors: Masaaki Yamada, Mitsuhiro Kitani
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Publication number: 20140184921Abstract: Provided is an LTE-system mobile communication terminal in which a reduction in terminal size and a reduction in the number of components is desired when a terrestrial digital television broadcast is to be received. Two antennas from among terrestrial digital television broadcast receiving antennas are switched and controlled so as to also be used as transmitting/receiving antennas from LTE communication, and the reception diversity is switched to either a 2-system combination or 4-system combination in accordance with whether the television broadcast is in the VHF band or UHF band. As a result, the number of antennas for example can be reduced and the terminal costs and size can be reduced.Type: ApplicationFiled: March 29, 2012Publication date: July 3, 2014Applicant: TKR CORPORATIONInventors: Yoshikazu Sugiyama, Masaaki Yamada
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Publication number: 20140145564Abstract: A housing and a rotary shaft of a motor are formed of non-magnetic material. A soft magnetic member is provided between a first axial end surface of a fixed core and a bearing. The soft magnetic member is provided on the fixed core side relative to the first bearing thereby to suppress magnetic flux leaking to a vicinity of one end part of the rotary shaft by leading the magnetic flux, which is generated from a rotor, to the rotor core through the fixed core and a casing. A magnetic angular position sensor fixed to one end part of the rotary shaft can detect a magnetic angular position of the rotor accurately without being affected by external magnetic field. As a result, noise generated by vibration of the motor can be suppressed.Type: ApplicationFiled: September 16, 2013Publication date: May 29, 2014Applicant: DENSO CORPORATIONInventors: Makoto TANIGUCHI, Jirou HAYASHI, Tatsuya INAGAKI, Akihito NAITOU, Hiroki TOMIZAWA, Masaaki YAMADA, Masashi YAMASAKI, Yasufumi MATSUO, Shuhei MIYACHI, Nobuhiko URYU
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Patent number: 8731874Abstract: Included are a table creating unit that creates, for a three-dimensional CAD model, tabular data that describes change logic for each changed state, the change logic associating a changed state with a condition to be satisfied to shift to the changed state, the changed state being a form after transformation of the three-dimensional CAD model; a data converting unit that converts each change logic set in the created tabular data into a description in a certain program language, and creates a model built-in program; an model built-in program IO unit that registers the converted model built-in program to the three-dimensional CAD model; and a three-dimensional CAD software-program unit that transforms the three-dimensional CAD model when receiving an operation for transforming the three-dimensional CAD model, based on the operation and a change logic described in a model built-in program registered to the three-dimensional CAD model.Type: GrantFiled: August 8, 2008Date of Patent: May 20, 2014Assignee: Mitsubishi Electric CoprorationInventors: Shin Kawabe, Shinya Itagaki, Osamu Makino, Koichi Nanno, Takeharu Kondo, Masaaki Yamada, Shiro Ikeda, Rio Sato, Masafumi Oguri
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Publication number: 20140125621Abstract: An information processing apparatus includes a touch panel which displays pieces of identification information including letters, figures, and symbols and detects a contact of the panel with a finger of a user or other object. When the touch panel detects the contact of the panel, a detection unit specifies identification information of one or more of the multiple pieces of identification information displayed on the touch panel, indicated by a position at which the contact in question occurred. The detection unit also detects an area of part of the panel where the contact occurred. A storage unit stores reference identification information and a reference area range. A control unit performs particular processing upon matching of the detected identification information with the stored reference identification information and the area of the contact detected by the detection unit falling within the stored reference area range.Type: ApplicationFiled: January 14, 2014Publication date: May 8, 2014Applicant: Hitachi Consumer Electronics Co., Ltd.Inventor: Masaaki YAMADA
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Publication number: 20140112687Abstract: A developing device to develop with two-component developer an electrostatic latent image includes a developer bearer to carry thereon developer supplied to the latent image bearer, a first conveyance channel disposed adjacent to the developer bearer, a second conveyance channel disposed adjacent to the first conveyance channel and farther from the developer bearer than the first conveyance channel, a first conveying member disposed in the first conveyance channel to agitate and transport developer supplied to the developer bearer, a second conveying member including a spiral blade winding around a shaft to transport developer in the second conveyance channel in a predetermined developer conveyance direction, and a collected-developer guide to guide a part of developer that leaves the developer bearer to the second conveyance channel beyond the first conveyance channel.Type: ApplicationFiled: October 22, 2013Publication date: April 24, 2014Inventors: Tomoya Ohmura, Akira Azami, Toshio Koike, Masaaki Yamada, Hiroaki Okamoto
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Patent number: 8654093Abstract: An information processing apparatus includes a touch panel which displays pieces of identification information including letters, figures, and symbols and detects a contact of the panel with a finger of a user or other object. When the touch panel detects the contact of the panel, a detection unit specifies identification information of one or more of the multiple pieces of identification information displayed on the touch panel, indicated by a position at which the contact in question occurred. The detection unit also detects an area of part of the panel where the contact occurred. A storage unit stores reference identification information and a reference area range. A control unit performs particular processing upon matching of the detected identification information with the stored reference identification information and the area of the contact detected by the detection unit falling within the stored reference area range.Type: GrantFiled: February 6, 2012Date of Patent: February 18, 2014Assignee: Hitachi Consumer Electronics Co., Ltd.Inventor: Masaaki Yamada
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Patent number: 8594540Abstract: A development device includes a toner carrier including first and second groups of electrodes, a toner supplier, and an electrical field generator. The electrical field generator includes a positive-phase pulse voltage generation circuit, a negative-phase pulse voltage generation circuit, a first DC power source for supplying a bias for setting a peak value of pulse voltages, a second DC power source to output a variable voltage having a polarity identical to a polarity of toner charge, a first diode having an anode connected to a lower potential side of the first DC power source and a cathode connected to an output terminal of the positive-phase pulse voltage generation circuit, and a second diode having an anode connected to the lower potential side of the first DC power source and a cathode connected to an output terminal of the negative-phase pulse voltage generation circuit.Type: GrantFiled: January 14, 2011Date of Patent: November 26, 2013Assignee: Ricoh Company, LimitedInventors: Tetsuro Hirota, Hideki Kosugi, Yoshiko Ogawa, Atsushi Kurokawa, Hideyasu Seki, Masaaki Yamada, Yuji Ishikura
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Patent number: 8588635Abstract: A development device includes a developer container, a rotary developer carrier that is disposed facing the latent image carrier and including multiple outer electrodes arranged in a circumferential direction of the developer carrier, an inner electrode electrically insulated from the multiple outer electrodes, an insulation layer disposed between the inner and outer electrodes, and a surface layer overlaying the outer electrodes and electrically insulating the multiple outer electrodes from each other, a bias power source to generate electrical fields that change with time by applying a first and second bias voltages to the inner and outer electrodes, respectively, an electrical field adjuster to regulate the electrical fields in accordance with a thickness of the surface layer of the developer carrier, and a controller.Type: GrantFiled: December 29, 2010Date of Patent: November 19, 2013Assignee: Ricoh Company, LimitedInventors: Yoshiko Ogawa, Yasuyuki Ishii, Hideki Kosugi, Masaaki Yamada, Atsushi Kurokawa, Yuji Ishikura