Patents by Inventor Masaki Yamashita
Masaki Yamashita 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: 8963472Abstract: An apparatus, comprises three driver FETs coupled at their sources; note-driver circuit; a first sense FET coupled to the sources of the three driver FETs; a current mirror having the first sense FET and a mirror FET; wherein the first sense FET is coupled to the mirror FET; a first transconductance amplifier coupled to the first sense FET; a second amplifier coupled to the current mirror, and an output of the first transconductance amplifier is an input to the second amplifier.Type: GrantFiled: March 20, 2013Date of Patent: February 24, 2015Assignee: Texas Instruments IncorporatedInventors: Daijiro Otani, Nakoyuki Tsuruoka, Masaki Yamashita
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Publication number: 20140265966Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.Type: ApplicationFiled: March 26, 2014Publication date: September 18, 2014Applicant: TEXAS INSTRUMENTS INCORPORATEDInventors: Masaki Yamashita, Chisako Asaoka, Nobuhiko Wasa
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Patent number: 8791657Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.Type: GrantFiled: June 26, 2013Date of Patent: July 29, 2014Assignee: Texas Instruments IncorporatedInventors: Masaki Yamashita, Chisako Asaoka, Nobuhiko Wasa
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Patent number: 8781793Abstract: The light emission analyzing device includes: a first light intensity calculation unit that performs polynomial approximation on a spectroscopic spectrum indicating a light intensity for each wavelength in a container as measured by a spectrometer so as to calculate the light intensity; a second light intensity calculation unit that subtracts, for each wavelength, the light intensity calculated by the first light intensity calculation unit from the light intensity indicated by the spectroscopic spectrum measured by the spectrometer so as to calculate a light intensity corresponding to a bright-line spectrum of a molecule; and a ratio calculation unit that calculates, by using the light intensity calculated by the second light intensity calculation unit, a ratio between (a) a peak value of a molecular spectrum of a first molecule and (b) a peak value of a molecular spectrum of a second molecule.Type: GrantFiled: May 22, 2012Date of Patent: July 15, 2014Assignee: CREV Inc.Inventors: Masaki Yamashita, Hiromi Mizukawa
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Publication number: 20140107980Abstract: The light emission analyzing device includes: a first light intensity calculation unit that performs polynomial approximation on a spectroscopic spectrum indicating a light intensity for each wavelength in a container as measured by a spectrometer so as to calculate the light intensity; a second light intensity calculation unit that subtracts, for each wavelength, the light intensity calculated by the first light intensity calculation unit from the light intensity indicated by the spectroscopic spectrum measured by the spectrometer so as to calculate a light intensity corresponding to a bright-line spectrum of a molecule; and a ratio calculation unit that calculates, by using the light intensity calculated by the second light intensity calculation unit, a ratio between (a) a peak value of a molecular spectrum of a first molecule and (b) a peak value of a molecular spectrum of a second molecule.Type: ApplicationFiled: May 22, 2012Publication date: April 17, 2014Inventors: Masaki Yamashita, Hiromi Mizukawa
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Patent number: 8678071Abstract: A lightweight metal mold having a necessary rigidity is realized. Firstly, an original pattern of an evaporative pattern is formed by machining an evaporative material block. The original pattern includes a three-dimensional mesh structure including a plurality of bar-shaped parts and connecting points that connect ends of the bar-shaped parts and are distributed in a three-dimensional space, and a plurality of block parts having fixed relative positional relationship by being fixed to the three-dimensional mesh structure. Then, at least a portion of at least one or more of the bar-shaped parts composing the original pattern is removed, and replaced with a tube member. Then, a full-mold casting is performed by using the evaporative pattern having the replaced tube member. Positional relationship of the block parts in which surfaces, etc. necessary for the metal mold are formed is fixed by the three-dimensional mesh structure, and the necessary rigidity is secured.Type: GrantFiled: January 28, 2011Date of Patent: March 25, 2014Assignee: Toyota Jidosha Kabushiki KaishaInventors: Hirotake Sueta, Kiyoshi Kameyama, Atsushi Takemoto, Tatsuya Watarai, Hitoshi Akimoto, Masaki Yamashita
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Publication number: 20140055107Abstract: A current driver is coupled to an inductor; a digital control for regulation of the current driver turns the current driver on or off coupled to the current driver; a comparator output coupled to the input of the digital control for regulation of the driver with inputs to compare a voltage of the inductor to a target voltage, a digital control for selection of one of a set of peaks and valleys of allowable current levels of the current driver, the digital control for selection of one of a set of peaks and valleys coupled to the output of the comparator and an input of the current driver, the digital control for the peak/valley current to monitor the duration of each high and low output state of the comparator output to determine the selection of one of the set of peak and valley of allowable current levels for the current driver.Type: ApplicationFiled: July 30, 2013Publication date: February 27, 2014Inventors: Naoyuki Tsuruoka, Daijiro Otani, Keita Ikai, Masaki Yamashita
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Publication number: 20140001994Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.Type: ApplicationFiled: June 26, 2013Publication date: January 2, 2014Inventors: Masaki Yamashita, Chisako Asaoka, Nobuhiko Wasa
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Publication number: 20130295316Abstract: A lightweight metal mold having a necessary rigidity is realized. Firstly, an original pattern of an evaporative pattern is formed by machining an evaporative material block. The original pattern includes a three-dimensional mesh structure including a plurality of bar-shaped parts and connecting points that connect ends of the bar-shaped parts and are distributed in a three-dimensional space, and a plurality of block parts having fixed relative positional relationship by being fixed to the three-dimensional mesh structure. Then, at least a portion of at least one or more of the bar-shaped parts composing the original pattern is removed, and replaced with a tube member. Then, a full-mold casting is performed by using the evaporative pattern having the replaced tube member. Positional relationship of the block parts in which surfaces, etc. necessary for the metal mold are formed is fixed by the three-dimensional mesh structure, and the necessary rigidity is secured.Type: ApplicationFiled: January 28, 2011Publication date: November 7, 2013Applicant: TOYOTA JIDOSHA KABUSHIKI KAISHAInventors: Hirotake Sueta, Kiyoshi Kameyama, Atsushi Takemoto, Tatsuya Watarai, Hitoshi Akimoto, Masaki Yamashita
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Publication number: 20130278199Abstract: An apparatus, comprises three driver FETs coupled at their sources; note-driver circuit; a first sense FET coupled to the sources of the three driver FETs; a current mirror having the first sense FET and a mirror FET; wherein the first sense FET is coupled to the mirror FET; a first transconductance amplifier coupled to the first sense FET; a second amplifier coupled to the current mirror, and an output of the first transconductance amplifier is an input to the second amplifier.Type: ApplicationFiled: March 20, 2013Publication date: October 24, 2013Inventors: Daijiro Otani, Nakoyuki Tsuruoka, Masaki Yamashita
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Patent number: 8497641Abstract: To provide a disk drive capable of inhibiting the occurrence of acoustic noise caused by a voltage pulse when the head is retracted using a speed control method using voltage obtained by rectifying a back electromotive force after the power source has been cut off from the rotation of a spindle motor. Retraction control circuit is used to control the on and off modes of transistors in accordance with the speed of VCM. The voltage across VCM becomes a voltage that can be regulated with VCM voltage control circuit. At this time, voltage is supplied to the terminals based on the voltage of ISO5V that is the rectified voltage of the back electromotive force of the spindle motor and the pulsating voltage is synchronized and produced at both terminals. As a result, the potential difference across VCM is such that the pulsating voltage is negated and acoustic noise is inhibited.Type: GrantFiled: March 10, 2010Date of Patent: July 30, 2013Assignee: Texas Instruments IncorporatedInventors: Masaki Yamashita, Chisako Ota, Nobuhiko Wasa
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Patent number: 8267729Abstract: A socket contact is configured to receive a part of a mating contact. The socket contact comprises a spring portion, a spring support portion and a lance. The spring portion is brought into contact with the mating contact when the socket contact receives the part of the mating contact. The spring support portion supports the spring portion. The lance is provided on the spring support portion.Type: GrantFiled: October 23, 2009Date of Patent: September 18, 2012Assignee: Japan Aviation Electronics Industry, LimitedInventors: Masaki Yamashita, Kazuhito Hisamatsu, Yosuke Honda
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Patent number: 8228629Abstract: The objective of this invention is to provide a motor control device, and a disk drive device using the same, in which during emergency operation it is possible to supply necessary power to the motor while limiting enlargement of the circuit area. During the retraction operation, control is performed to alternate between a short-circuit mode in which each terminal U, V, W of the spindle motor M1 is short-circuited to the terminal ICOM, and a rectifying mode in which the back electromotive force of the spindle motor M1 is rectifies and output to the power supply line ISO3V, VGND while the input of power from the power supply line ISO3V, VGND to the spindle motor M1 is blocked.Type: GrantFiled: March 24, 2010Date of Patent: July 24, 2012Assignee: Texas Instruments IncorporatedInventors: Masaki Yamashita, Chisako Ota
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Patent number: 8177571Abstract: A connector has a housing, an insertion slot into which a connection target is inserted, an actuator and a contact. The actuator has a pusher. The actuator is held on the housing so as to be turnable between an open position and a close position. The actuator allows the connection target to be inserted into the insertion slot when the actuator is positioned at the open position. The pusher pushes the inserted connection target when the actuator is positioned at the close position. The contact is held by the housing. The contact includes a spring section and a supported section supported by the spring section. The supported section includes a press section and a contacting section. The press section presses the pusher against the inserted connection target and receives, from the pusher, a reaction force directed away from the connection target when the actuator is located at the close position.Type: GrantFiled: July 20, 2010Date of Patent: May 15, 2012Assignee: Japan Aviation Electronics Industry, LimitedInventors: Hiroyuki Yokoo, Nobukazu Kato, Masaki Yamashita
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Patent number: 8025516Abstract: A plate-like connection target is inserted into a connector along a first direction. The connector has a first metal member having a first metal abutment portion, a second metal member having a second metal abutment portion, and an actuator operable to push the second metal abutment portion toward the first metal abutment portion for holding the plate-like connection target between the first metal abutment portion and the second metal abutment portion in a second direction perpendicular to the first direction in a state in which the plate-like connection target has been inserted in the connector.Type: GrantFiled: April 30, 2010Date of Patent: September 27, 2011Assignee: Japan Aviation Electronics Industry, LimitedInventors: Hiroyuki Yokoo, Masaki Yamashita
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Patent number: 7902778Abstract: A disk drive system including retract logic for control of the voice coil motor in a retract operation, in which the voice coil motor positions the read/write head actuator arm in a safe place in a loss-of-power event, is disclosed. The retract logic includes circuitry for controlling the application of power to the voice coil motor from an external capacitor, so that a constant voltage is maintained across the voice coil motor. Current from the capacitor is directed to an internal variable resistor that conducts a selected current, in parallel with the current applied to the voice coil motor. The voltage developed across the variable resistor is applied to one input of a control amplifier, which receives the voltage across the voice coil motor at another input; the control amplifier in turn controls the gate of a low side transistor. The transistor passes current to the extent that the voltage across the voice coil motor corresponds to that developed across the variable resistor.Type: GrantFiled: June 6, 2007Date of Patent: March 8, 2011Assignee: Texas Instruments IncorporatedInventors: Masaki Yamashita, Chisako Ota
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Publication number: 20110028018Abstract: A connector has a housing, an insertion slot into which a connection target is inserted, an actuator and a contact. The actuator has a pusher. The actuator is held on the housing so as to be turnable between an open position and a close position. The actuator allows the connection target to be inserted into the insertion slot when the actuator is positioned at the open position. The pusher pushes the inserted connection target when the actuator is positioned at the close position. The contact is held by the housing. The contact includes a spring section and a supported section supported by the spring section. The supported section includes a press section and a contacting section. The press section presses the pusher against the inserted connection target and receives, from the pusher, a reaction force directed away from the connection target when the actuator is located at the close position.Type: ApplicationFiled: July 20, 2010Publication date: February 3, 2011Applicant: Japan Aviation Electronics Industry, LimitedInventors: Hiroyuki Yokoo, Nobukazu Kato, Masaki Yamashita
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Patent number: 7872004Abstract: The present invention relates to a compound represented by the following formula [I] wherein each symbol is as defined in the specification, or a pharmaceutically acceptable salt thereof, or a solvate thereof, and a pharmaceutical composition, an anti-HIV agent and an HIV integrase inhibitor containing such compound. The compound of the present invention has an HIV integrase inhibitory activity, and is useful as an anti-HIV agent, or as an agent for the prophylaxis or treatment of AIDS. In addition, by the combined use with other anti-HIV agents such as a protease inhibitor, a reverse transcriptase inhibitor and the like, it can be a more effective anti-HIV agent. Because it shows integrase-specific high inhibitory activity, the compound can be a pharmaceutical agent safe on human body, which causes only a fewer side effects.Type: GrantFiled: June 22, 2007Date of Patent: January 18, 2011Assignee: Japan Tobacco Inc.Inventors: Motohide Satoh, Hisateru Aramaki, Masaki Yamashita, Masafumi Inoue, Hiroshi Kawakami, Hisashi Shinkai, Hiroshi Nakamura, Yuji Matsuzaki, Shuichi Wamaki
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Publication number: 20100315738Abstract: The objective of this invention is to provide a motor control device, and a disk drive device using the same, in which during emergency operation it is possible to supply necessary power to the motor while limiting enlargement of the circuit area. During the retraction operation, control is performed to alternate between a short-circuit mode in which each terminal U, V, W of the spindle motor Ml is short-circuited to the terminal ICOM, and a rectifying mode in which the back electromotive force of the spindle motor M1 is rectifies and output to the power supply line ISO3V, VGND while the input of power from the power supply line ISO3V, VGND to the spindle motor M1 is blocked.Type: ApplicationFiled: March 24, 2010Publication date: December 16, 2010Inventors: Masaki Yamashita, Chisako Ota
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Patent number: D725597Type: GrantFiled: November 21, 2013Date of Patent: March 31, 2015Assignee: Japan Aviation Electronics Industry, LimitedInventor: Masaki Yamashita