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Akira Yasuda, Jun ichi Okamura: Speaker control device and speaker control method. TRIGENCE SEMICONDUCTOR, Hauptman Ham, May 15, 2018: US09973850

A speaker control device in one embodiment includes an oscillator connected in parallel with a drive circuit for driving a speaker, the oscillator changing an oscillation frequency according to a voltage, and a control circuit detecting a variation in the oscillation frequency of the oscillator, and ...


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Akira Yasuda, Jun ichi Okamura: Inverter for a driving a motor. TRIGENCE SEMICONDUCTOR, TYPHA IP, March 15, 2016: US09287809

An inverter for generating a plurality of alternating signals to be supplied to a motor, the motor having a plurality of phases and a plurality of coils arranged at each of the plurality of phases is provided. The inverter is a motor driving inverter characterized in including a multi-level pulse-de ...


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Akira Yasuda, Akihiro Ito, Masato Tanaka: Actuator, shutter driving device for camera and method of manufacturing actuator. Seiko Precision, Kratz Quintos & Hanson, March 2, 2010: US07670068

An actuator includes: a coil for excitation; a stator excited with different magnetic poles by energization of the coil; a rotor magnetized with different magnetic poles in a circumferential direction, and rotated by magnetic force generating between the rotor and the stator; and an outputting membe ...


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Akira Yasuda, Takeshi Kinoshita, Toshihiro Hirai: Focusing device and imaging device. Seiko Precision, Kilpatrick Townsend & Stockton, April 26, 2011: US07933081

A focusing device of simple construction that is miniaturizable, and an imaging device utilizing the same, are provided. A focusing device (10) comprises an actuator (11), a lens holder (12) that holds lenses (13a) and (13b), and a holder support base (14) upon which the lens holder (12) is installe ...


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Akira Yasuda, Shuichi Kawaguchi, Akihiro Ito, Mikishige Sugasa, Shigeru Yanagisawa: Actuator and blade drive device for camera. Seiko Precision, Kratz Quintos & Hanson, June 8, 2010: US07731434

An electromagnetic actuator includes; a coil for excitation; a stator excited with different magnetic poles by energization of the coil; a rotor magnetized with different magnetic poles in a circumferential direction thereof, and rotated by a magnetic force generated between the rotor and the stator ...


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Akira Yasuda, Jun ichi Okamura: Drive circuit. Trigence Semiconductor, Typha IP, May 2, 2017: US09641931

As one embodiment a drive circuit is disclosed. When a three-value signal including a value representing zero is input, the drive circuit outputs two two-value signals that drive two drive elements such that the difference between values representing the two two-value signals corresponds to a value ...


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Akira Yasuda: Comparator. Kabushiki Kaisha Toshiba, Oblon Spivak McClelland Maier & Neustadt PC, November 22, 2005: US06967503

A comparator compares a first binary input signal and a second binary input signal each binalized. A generator generates a reset signal at each rising edge or each falling edge of the first input signal. A counter counts the second input signal at each timing determined by the reset signal. The coun ...


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Akira Yasuda: Stencil carrier apparatus. Riso Kagaku Corporation, Kanesaka and Takeuchi, December 31, 1991: US05076161

A stencil carrier apparatus including a semi-cylindrical driving feed roller, driven feed rollers, a pressure guide plate, and a control cam enables a used stencil from a printing drum to be reliably transported to a stencil receiver so as to be discharged out of a printing apparatus.


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Akira Yasuda, Jun ichi Okamura: Conversion device. Trigence Semiconductor, January 13, 2015: US08933833

The disclosed conversion device converts an analog input signal into a digital signal and outputs thereof, wherein the conversion device comprises a feedback signal generator for performing mismatch shaping on the digital signal that has been converted and output, and then performing digital-analog ...


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Akira Yasuda, Jun ichi Okamura: Speaker control device. Trigence Semiconductor, Typha IP, April 18, 2017: US09628928

A speaker control device in one embodiment includes a time to digital converter connected to a drive power source in series with a drive circuit for driving a plurality of coils of a speaker, the converter outputting a digital data in accordance with a voltage of the drive power source, and a monito ...