Patents by Inventor Hirokazu Sekino
Hirokazu Sekino 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: 8009846Abstract: An ultrasonic speaker including: a vibration film having a conductive layer; a pair of fixed electrodes provided oppositely to respective surfaces of the vibration film; and an ultrasonic transducer that causes the vibration film to generate sound waves by applying a DC bias voltage to the conductive layer of the vibration film while applying an alternating signal between the pair of fixed electrodes, and outputs the sound waves generated by the vibration film from two sound wave output surfaces via through-holes provided in each of the pair of fixed electrodes. The two sound wave output surfaces of the ultrasonic transducer are disposed in a direction intersecting with a sound wave emitting direction at right angles.Type: GrantFiled: June 22, 2009Date of Patent: August 30, 2011Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Kinya Matsuzawa, Yoshiki Fukui, Shinichi Miyazaki
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Publication number: 20110190804Abstract: A fluid injection device that injects a fluid to a biological tissue from an injection opening to excise the biological tissue, includes: a fluid injection means that injects the fluid from the injection opening; and a suction means that sucks at least one of the injected fluid and the excised biological tissue by periodically varying a negative suction pressure.Type: ApplicationFiled: January 27, 2011Publication date: August 4, 2011Applicant: SEIKO EPSON CORPORATIONInventors: Hirokazu SEKINO, Takeshi SETO, Hideki KOJIMA
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Patent number: 7949143Abstract: An ultrasonic speaker or acoustic system includes an electrostatic type ultrasonic transducer of a push-pull system is constructed such that a through hole is arranged in the central portion of a fixing electrode of a circular shape. A sound wave reflecting plate is arranged on the rear face of the ultrasonic transducer and an ultrasonic wave radiated from the rear face of the ultrasonic transducer is reflected by the sound wave reflecting plate and is radiated to the front face of the ultrasonic transducer through the through hole.Type: GrantFiled: April 23, 2009Date of Patent: May 24, 2011Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Kinya Matsuzawa
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Patent number: 7881489Abstract: An ultrasonic transducer includes: a fixed electrode having corrugations on the surface; a vibrating film having an electrode layer and disposed on the surface of the fixed electrode; and a holding member which holds the fixed electrode and the vibrating film. The ultrasonic transducer is driven by applying an AC signal between the electrode layer of the vibrating film and the fixed electrode, and generates a sound pressure of at least 120 dB within a frequency range from 20 kHz to 120 kHz.Type: GrantFiled: May 11, 2005Date of Patent: February 1, 2011Assignee: Seiko Epson CorporationInventors: Kinya Matsuzawa, Hirokazu Sekino, Yoshiki Fukui, Shinichi Miyazaki
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Publication number: 20090257606Abstract: An ultrasonic speaker including: a vibration film having a conductive layer; a pair of fixed electrodes provided oppositely to respective surfaces of the vibration film; and an ultrasonic transducer that causes the vibration film to generate sound waves by applying a DC bias voltage to the conductive layer of the vibration film while applying an alternating signal between the pair of fixed electrodes, and outputs the sound waves generated by the vibration film from two sound wave output surfaces via through-holes provided in each of the pair of fixed electrodes. The two sound wave output surfaces of the ultrasonic transducer are disposed in a direction intersecting with a sound wave emitting direction at right angles.Type: ApplicationFiled: June 22, 2009Publication date: October 15, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Hirokazu Sekino, Kinya Matsuzawa, Yoshiki Fukui, Shinichi Miyazaki
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Publication number: 20090202088Abstract: An ultrasonic speaker or acoustic system includes an electrostatic type ultrasonic transducer of a push-pull system is constructed such that a through hole is arranged in the central portion of a fixing electrode of a circular shape. A sound wave reflecting plate is arranged on the rear face of the ultrasonic transducer and an ultrasonic wave radiated from the rear face of the ultrasonic transducer is reflected by the sound wave reflecting plate and is radiated to the front face of the ultrasonic transducer through the through hole.Type: ApplicationFiled: April 23, 2009Publication date: August 13, 2009Applicant: Seiko Epson CorporationInventors: Hirokazu SEKINO, Kinya MATSUZAWA
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Patent number: 7564986Abstract: An ultrasonic speaker including: a vibration film having a conductive layer; a pair of fixed electrodes provided oppositely to respective surfaces of the vibration film; and an ultrasonic transducer that causes the vibration film to generate sound waves by applying a DC bias voltage to the conductive layer of the vibration film while applying an alternating signal between the pair of fixed electrodes, and outputs the sound waves generated by the vibration film from two sound wave output surfaces via through-holes provided in each of the pair of fixed electrodes. The two sound wave output surfaces of the ultrasonic transducer are disposed in a direction intersecting with a sound wave emitting direction at right angles. Also, sound wave reflection plates are provided to both of the two sound wave output surfaces of the ultrasonic transducer so that the sound waves outputted from each of the two sound wave output surfaces are reflected in the sound wave emitting direction.Type: GrantFiled: June 16, 2005Date of Patent: July 21, 2009Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Kinya Matsuzawa, Yoshiki Fukui, Shinichi Miyazaki
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Patent number: 7542579Abstract: An electrostatic type ultrasonic transducer of a push-pull system is constructed such that a through hole is arranged in the central portion of a fixing electrode of a circular shape. A sound wave reflecting plate is arranged on the rear face of the ultrasonic transducer and an ultrasonic wave radiated from the rear face of the ultrasonic transducer is reflected by the sound wave reflecting plate and is radiated to the front face of the ultrasonic transducer through the through hole.Type: GrantFiled: September 15, 2005Date of Patent: June 2, 2009Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Kinya Matsuzawa
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Publication number: 20080013761Abstract: An ultrasonic transducer includes: a fixed electrode having corrugations on the surface; a vibrating film having an electrode layer and disposed on the surface of the fixed electrode; and a holding member which holds the fixed electrode and the vibrating film. The ultrasonic transducer is driven by applying an AC signal between the electrode layer of the vibrating film and the fixed electrode, and generates a sound pressure of at least 120 dB within a frequency range from 20 kHz to 120 kHz.Type: ApplicationFiled: May 11, 2005Publication date: January 17, 2008Applicant: Seiko Epson CorporationInventors: Kinya Matsuzawa, Hirokazu Sekino, Yoshiki Fukui, Shinichi Miyazaki
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Publication number: 20070242843Abstract: An ultrasonic transducer includes: a pair of fixed electrodes including a conductive member; a vibrating film having a conductive layer; and a member which holds the pair of fixed electrodes and the vibrating film. The vibrating film is formed of nonconductive bodies and has an electrode layer formed of a conductive material. The electrode layer is applied with a DC bias voltage of a single polarity by a DC bias supply, and is also applied with an AC signal output from a signal source superimposed on the DC bias voltage. The pair of fixed electrodes have a plurality of holes of the same number at positions facing each other via the vibrating film, and an AC signal is applied between the conductive members of the pair of fixed electrodes by the signal source.Type: ApplicationFiled: April 7, 2005Publication date: October 18, 2007Applicant: Seiko Epson CorporationInventors: Kinya Matsuzawa, Hirokazu Sekino, Yoshiki Fukui, Shinichi Miyazaki
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Publication number: 20070195976Abstract: An electrostatic ultrasonic transducer includes a first electrode that has through-holes, a second electrode that has through-holes, and a vibrating membrane that is disposed such that the through-holes of the first electrode and the through-holes of the second electrode form a pair, interposed between a pair of electrodes composed of the first electrode and the second electrode, and having a conductive layer applied with a direct current bias voltage. The first electrode and the second electrode each have counter electrode portions that are formed in the through-holes to face the vibrating membrane, and a modulated wave, which is obtained by modulating a carrier wave in an ultrasonic frequency band with a signal wave in an audible frequency band, is applied between the pair of electrodes.Type: ApplicationFiled: February 21, 2007Publication date: August 23, 2007Applicant: SEIKO EPSON CORPORATIONInventors: Hirokazu Sekino, Kinya Matsuzawa, Hideki Kojima
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Publication number: 20060182293Abstract: An electrostatic type ultrasonic transducer of a push-pull system is constructed such that a through hole is arranged in the central portion of a fixing electrode of a circular shape. A sound wave reflecting plate is arranged on the rear face of the ultrasonic transducer and an ultrasonic wave radiated from the rear face of the ultrasonic transducer is reflected by the sound wave reflecting plate and is radiated to the front face of the ultrasonic transducer through the through hole.Type: ApplicationFiled: September 15, 2005Publication date: August 17, 2006Inventors: Hirokazu Sekino, Kinya Matsuzawa
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Publication number: 20050281420Abstract: An ultrasonic speaker including: a vibration film having a conductive layer; a pair of fixed electrodes provided oppositely to respective surfaces of the vibration film; and an ultrasonic transducer that causes the vibration film to generate sound waves by applying a DC bias voltage to the conductive layer of the vibration film while applying an alternating signal between the pair of fixed electrodes, and outputs the sound waves generated by the vibration film from two sound wave output surfaces via through-holes provided in each of the pair of fixed electrodes. The two sound wave output surfaces of the ultrasonic transducer are disposed in a direction intersecting with a sound wave emitting direction at right angles. Also, sound wave reflection plates are provided to both of the two sound wave output surfaces of the ultrasonic transducer so that the sound waves outputted from each of the two sound wave output surfaces are reflected in the sound wave emitting direction.Type: ApplicationFiled: June 16, 2005Publication date: December 22, 2005Inventors: Hirokazu Sekino, Kinya Matsuzawa, Yoshiki Fukui, Shinichi Miyazaki
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Patent number: 6633511Abstract: An inside notch (37) serving as an adjusting section is provided for a magnetic balancing adjustment between stators (31 and 32) and a rotor (12). The inside notch acts to reduce cogging torque, thereby allowing the rotor to rotate using a slight torque. Therefore, the rotor can be more readily started without using a complicated structure, can be prevented from easily stopping due to an external disturbance, and can be made more reliable. In reducing the cogging torque, it is not necessary to reduce the number of magnetic flux lines by, for example, making a rotor magnet (12b) smaller, making it possible to maintain the efficiency with which electrical power is produced.Type: GrantFiled: October 3, 2000Date of Patent: October 14, 2003Assignee: Seiko Epson CorporationInventors: Masatoshi Moteki, Hirokazu Sekino, Kinya Matsuzawa
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Patent number: 5632157Abstract: An electric automobile comprises a wheel driving motor (8, 10, 15, 21, 50, 80) and a refrigerating system for air-conditioning the interior of an electric automobile. The refrigerating system has a compressor (7, 22, 57), an outdoor heat exchanger (6, 25, 53), an expansion valve (3a, 3b, 13, 27, 28, 55, 58), and an indoor heat exchanger (4, 29, 54) connected in series by a refrigerant pipe. The wheel driving motor (8, 10, 15, 21, 50, 80) is provided within the refrigerating system, and the wheel driving motor is cooled directly by the refrigerating system.Type: GrantFiled: October 31, 1995Date of Patent: May 27, 1997Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Issei Yamakoshi
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Patent number: 5507153Abstract: The electric motor vehicle of this invention is an electric motor vehicle which is provided with a drive motor (13) driven by electric power from a storage battery (11), an air conditioner (1), and a regenerative brake means which temporarily uses the motor (13) as a generator when decelerating the vehicle to generate regenerative electric power and to charge the storage battery (11). It is further provided with an excess regenerative electric power judging means (18) for judging excess regenerative electrical energy based on regenerative electrical energy by the regenerative brake and allowable regenerative electrical energy of the storage battery at that time, and an electric power distribution means (14) for distributing the excess regenerative electric power based on the excess regenerative electrical energy.Type: GrantFiled: November 17, 1994Date of Patent: April 16, 1996Assignee: Seiko Epson CorporationInventors: Takeshi Seto, Hirokazu Sekino
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Patent number: 5488837Abstract: An electric automobile comprises a wheel driving motor (8, 10, 15, 21, 50, 80) and a refrigerating system for air-conditioning the interior of an electric automobile. The refrigerating system has a compressor (7, 22, 57), an outdoor heat exchanger (6, 25, 53), an expansion valve (3a, 3b, 13, 27, 28, 55, 58), and an indoor heat exchanger (4, 29, 54) connected in series by a refrigerant pipe. The wheel driving motor (8, 10, 15, 21, 50, 80) is provided within the refrigerating system, and the wheel driving motor is cooled directly by the refrigerating system.Type: GrantFiled: May 25, 1994Date of Patent: February 6, 1996Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Issei Yamakoshi
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Patent number: 5345777Abstract: An electric automobile comprises a wheel driving motor (8, 10, 15, 21, 50, 80) and a refrigerating system for air-conditioning the interior of an electric automobile. The refrigerating system has a compressor (7, 22, 57), an outdoor heat exchanger (6, 25, 53), an expansion valve (3a, 3b, 13, 27, 28, 55, 58), and an indoor heat exchanger (4, 29, 54) connected in series by a refrigerant pipe. The wheel driving motor (8, 10, 15, 21, 50, 80) is provided within the refrigerating system, and the wheel driving motor is cooled directly by the refrigerating system.Type: GrantFiled: November 5, 1993Date of Patent: September 13, 1994Assignee: Seiko Epson CorporationInventors: Hirokazu Sekino, Issei Yamakoshi