Patents by Inventor Yusuke Tajima
Yusuke Tajima 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: 20230251217Abstract: A method, in accordance with an embodiment of the present invention, for testing for mastitis in a domestic animal includes the step of measuring, by nuclear magnetic resonance (NMR), a spin-spin relaxation time of milk collected from a quarter of the domestic animal.Type: ApplicationFiled: October 16, 2020Publication date: August 10, 2023Inventors: Yusuke TAJIMA, Hideo YOKOTA, Yoshio KIKU, Tomohito HAYASHI, Osamu MIKAMI, Yuya NAGASAWA
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Patent number: 10021769Abstract: A light driving apparatus which supplies power to a light source in accordance with an indication from a control apparatus includes: a housing which is box-shaped; a wireless communication module which is housed in the housing, and includes an antenna for wireless communication with the control apparatus; and a light driver which is housed in the housing, and supplies power to the light source in accordance with the indication received from the control apparatus via the wireless communication module, wherein the housing includes two opposite faces having slits through which an electromagnetic wave which the antenna emits when excited by the wireless communication module passes, the slits extending in a direction three-dimensionally crossing a direction in which the wireless communication module excites the antenna.Type: GrantFiled: May 16, 2017Date of Patent: July 10, 2018Assignee: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hajime Ozaki, Tatsumi Setomoto, Tamotsu Ando, Tomokazu Yamamoto, Kazuhiro Matsumoto, Yusuke Tajima
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Publication number: 20170339772Abstract: A light driving apparatus which supplies power to a light source in accordance with an indication from a control apparatus includes: a housing which is box-shaped; a wireless communication module which is housed in the housing, and includes an antenna for wireless communication with the control apparatus; and a light driver which is housed in the housing, and supplies power to the light source in accordance with the indication received from the control apparatus via the wireless communication module, wherein the housing includes two opposite faces having slits through which an electromagnetic wave which the antenna emits when excited by the wireless communication module passes, the slits extending in a direction three-dimensionally crossing a direction in which the wireless communication module excites the antenna.Type: ApplicationFiled: May 16, 2017Publication date: November 23, 2017Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.Inventors: Hajime OZAKI, Tatsumi SETOMOTO, Tamotsu ANDO, Tomokazu YAMAMOTO, Kazuhiro MATSUMOTO, Yusuke TAJIMA
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Patent number: 9653964Abstract: [Problem] To reduce the size of a linear actuator motor without increasing the operating noise thereof, and to thereby achieve a quieter, more compact linear actuator. [Solution] A linear actuator including: a shaft that is rotated in the forward and reverse directions by a motor via a double start worm and a worm wheel; a screw nut that is screwed and mounted to the shaft; and a piston tube that is fixed to the screw nut and that advances or retreats in accordance with the rotation of the shaft. The motor includes: a four-pole magnet; an armature formed by lap winding an armature coil; a commutator; brushes that are vertically arranged at positions offset by approximately 90°; and an equalizer for connecting coils in the armature coil that are to undergo potential equalization.Type: GrantFiled: July 3, 2013Date of Patent: May 16, 2017Assignee: MITSUBA CORPORATIONInventors: Masato Nakamura, Masaki Inoue, Masatoshi Suzuki, Yusuke Tajima, Yuta Suzuki, Shinya Oki
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Publication number: 20150295540Abstract: Various methods and apparatus for operating an outphasing amplifier comprising first and second amplifiers to achieve wider bandwidth and higher efficiency of operation of the outphasing amplifier are disclosed.Type: ApplicationFiled: April 13, 2015Publication date: October 15, 2015Inventors: John Muir, Yusuke Tajima
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Publication number: 20150222230Abstract: An outphasing amplifier apparatus and method is disclosed that controls pulse width modulation and/or pulse height modulation to improve power-added-efficiency performance and/or compensate for errors caused by quantized pulse position settings is provided herein.Type: ApplicationFiled: January 23, 2015Publication date: August 6, 2015Inventors: Yusuke Tajima, John Muir, David Wandrei
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Publication number: 20150180306Abstract: [Problem] To reduce the size of a linear actuator motor without increasing the operating noise thereof, and to thereby achieve a quieter, more compact linear actuator. [Solution] A linear actuator including: a shaft that is rotated in the forward and reverse directions by a motor via a double start worm and a worm wheel; a screw nut that is screwed and mounted to the shaft; and a piston tube that is fixed to the screw nut and that advances or retreats in accordance with the rotation of the shaft. The motor includes: a four-pole magnet; an armature formed by lap winding an armature coil; a commutator; brushes that are vertically arranged at positions offset by approximately 90°; and an equalizer for connecting coils in the armature coil that are to undergo potential equalization.Type: ApplicationFiled: July 3, 2013Publication date: June 25, 2015Inventors: Masato Nakamura, Masaki Inoue, Masatoshi Suzuki, Yusuke Tajima, Yuta Suzuki, Shinya Oki
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Patent number: 9030255Abstract: Circuits and techniques to linearize the operation of an RF power amplifier are described. A linearizer circuit may include a non-amplification signal path which includes a delay line and an amplification signal path which includes at least one amplifier stage. In some embodiments, the amplification signal path may include an odd number of amplification stages. The linearizer may be used to precondition an input signal of an RF power amplifier in a manner that improves the overall linearity of operation.Type: GrantFiled: March 7, 2013Date of Patent: May 12, 2015Assignee: Auriga Measurement Systems, LLCInventors: Cheryl V. Liss, Yusuke Tajima, Qin Shen-Schultz, John Muir
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Publication number: 20140368279Abstract: A radio frequency (RF) circuit includes an amplifier circuit comprising at least one transistor amplifier having first, second, and third terminals. The RF circuit additionally includes a driver circuit comprising an enhancement-mode transistor and a depletion-mode transistor coupled in a cascade configuration having an upper portion and a lower portion, the driver circuit having an output coupled to an input of the amplifier circuit such that the driver circuit is capable of providing pulsed signals as well as a direct-current (DC) bias current to at least one terminal of a transistor amplifier of the amplifier circuit. A corresponding method is also provided.Type: ApplicationFiled: June 18, 2014Publication date: December 18, 2014Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventor: Yusuke Tajima
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Publication number: 20140368278Abstract: A driver circuit includes a first sub-driver circuit having an input coupled to receive a first pulsed signal, the first sub-driver circuit being configured to generate a first driver signal at an output thereof in response to the first pulsed signal, the first driver signal having relatively fast edge transitions and a low current capability. Also included is a second sub-driver circuit having an input coupled to receive a second pulsed signal, the second sub-driver circuit being configured to generate a second driver signal at an output thereof in response to the second pulsed signal, the second driver signal having edge transitions that are slower than those of the first driver signal and a current capability that is higher than that of the first driver signal.Type: ApplicationFiled: June 18, 2014Publication date: December 18, 2014Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventor: Yusuke Tajima
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Publication number: 20140368268Abstract: A pulse width modulated/pulse modulated PWM/PPM power amplification circuit includes a load modulation circuit coupled between an output of the amplification circuit and a load. In one embodiment, the load modulation circuit comprises a plurality of capacitor elements switchably coupled such that in response to a control signal provided the load modulation circuit presents one of a plurality of different capacitance values at a terminal thereof. By changing capacitance values associated with the plurality of capacitor elements in accordance with the output of the amplification circuit and the load, improved (and “optimum”) power levels that exhibit a desired (and best) efficiency can be selected. Such results in an amplification circuit having an efficiency level which is relatively high compare with efficiency levels of conventional amplifier circuits over a wide dynamic range of output power.Type: ApplicationFiled: June 18, 2014Publication date: December 18, 2014Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventors: Yusuke Tajima, John Muir
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Publication number: 20140253245Abstract: A distributed RF amplifier includes filter circuits to band limit input signal components applied to corresponding amplifiers. Different amplifiers in the distributed amplifier may be band limited to different pass bands. The different pass bands may collectively cover an operational frequency range of the distributed amplifier.Type: ApplicationFiled: March 6, 2013Publication date: September 11, 2014Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventor: Yusuke Tajima
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Patent number: 8810314Abstract: An envelope tracking power amplifier uses signal cancellation techniques to provide isolation between RF signals and envelope signals, without the use of filters. In this manner, the envelope tracking power amplifiers are capable of operating with envelope signals that are at or near the frequency of the corresponding RF signals. In at least one embodiment, a double balanced power amplifier is provided that includes a balanced RF input port, a balanced RF output port, and a balanced envelope input port. The balanced nature of the amplifier results in ports of the amplifier forming virtual grounds with respect to signals at other ports. In some other embodiments, a single balanced amplifier is provided that provides isolation between ports thereof.Type: GrantFiled: February 14, 2013Date of Patent: August 19, 2014Assignee: Auriga Measurement Systems, LLCInventors: Steven A. Mulawski, Yusuke Tajima
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Power Amplification System Using Doherty Amplifier with Linearization Circuit and Related Techniques
Publication number: 20130241656Abstract: A power amplification system includes a linearizer circuit feeding a power amplifier to linearize the operation of the power amplifier. The linearizer circuit may shape the input signal of the power amplifier in a manner that complements the output power versus input power characteristic of the power amplifier. In some embodiments, the linearizer may increase the relative magnitude of higher power portions of the input signal while decreasing the relative magnitude of lower power portions of the input signal to provide an overall increase in the linearity of the power amplification system. The power amplifier may include a Doherty amplifier in some implementations.Type: ApplicationFiled: March 7, 2013Publication date: September 19, 2013Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventors: Yusuke Tajima, Cheryl V. Liss, John Muir, Qin Shen-Schultz -
Publication number: 20130241655Abstract: Circuits and techniques to linearize the operation of an RF power amplifier are described. A linearizer circuit may include a non-amplification signal path which includes a delay line and an amplification signal path which includes at least one amplifier stage. In some embodiments, the amplification signal path may include an odd number of amplification stages. The linearizer may be used to precondition an input signal of an RF power amplifier in a manner that improves the overall linearity of operation.Type: ApplicationFiled: March 7, 2013Publication date: September 19, 2013Applicant: AURIGA MEASUREMENT SYSTEMS, LLCInventors: Cheryl V. Liss, Yusuke Tajima, Qin Shen-Schultz, John Muir
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Patent number: 8368451Abstract: A radio frequency (RF) switch circuit includes switching devices coupled at a common node and a floating control signal circuit (CSS) coupled to the control electrodes of the switching devices and the common node and configured to isolate RF signals from the CSS and configured to provide differential voltage signals to the common node and each of the control electrodes.Type: GrantFiled: March 31, 2011Date of Patent: February 5, 2013Assignee: Auriga Measurement Systems, LLCInventors: Steven A. Mulawski, Yusuke Tajima
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Publication number: 20120327638Abstract: An Illumination appliance includes: an appliance body which houses a light source; a frame which is attached to the appliance body; and a power supply unit. The power supply unit is attached to a portion of a top surface of the appliance body and which is configured to feed power to the light source.Type: ApplicationFiled: February 28, 2011Publication date: December 27, 2012Applicant: PANASONIC CORPORATIONInventors: Yusuke Tajima, Yuji Nakagawa, Hideomi Furuya
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Patent number: 8289085Abstract: An amplifier circuit includes a pair of amplifying devices, a first balun coupled between an input port of the amplifier circuit and RF input ports of the pair of amplifying devices and a second balun coupled between RF output ports of the pair of amplifying devices and an output port of the amplifier circuit wherein the first and second baluns are configured such that the amplifier circuit operates under open condition for signals at a second harmonic frequency even when the second harmonic frequency is within an operating frequency band of a fundamental frequency of the amplifier circuit. In one embodiment, the amplifier circuit includes a bypass circuit which selectively couples balun ports to ground such that in response to a first control signal, the amplifier circuit operates in an amplifying mode and in response to a second control signal, the amplifier circuit operates in a bypass mode.Type: GrantFiled: December 16, 2010Date of Patent: October 16, 2012Assignee: Auriga Measurement Systems, LLCInventors: Yusuke Tajima, John Muir
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Patent number: 8224264Abstract: A power supply stage includes a digital signal generation means to generate n bit digital signal, a selection means for power supply voltages in dependence on n bit digital signal and an adjusting means for receiving the selected power supply voltage and the envelope signal and adapted to generate an adjusted selected power supply voltage tracking the envelope signal.Type: GrantFiled: November 13, 2009Date of Patent: July 17, 2012Assignee: Auriga Measurement Systems, LLCInventors: Yusuke Tajima, Mark A. Royer, James A. Sozanski
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Publication number: 20110241755Abstract: A radio frequency (RF) switch circuit includes switching devices coupled at a common node and a floating control signal circuit (CSS) coupled to the control electrodes of the switching devices and the common node and configured to isolate RF signals from the CSS and configured to provide differential voltage signals to the common node and each of the control electrodes.Type: ApplicationFiled: March 31, 2011Publication date: October 6, 2011Applicant: Auriga Measurement Systems, LLCInventors: Steven A. Mulawski, Yusuke Tajima