Patents by Inventor Eitaro Otsuka
Eitaro Otsuka 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: 8026771Abstract: A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that converts a current that flows through the vibrator into a voltage, an output circuit that causes the vibrator to produce the driving vibrations based on a signal that is converted into a voltage with respect to a given voltage, and a high-pass filter that is provided in the oscillation loop between the current-voltage converter and the output circuit. The driver device causes the vibrator to produce the driving vibrations while changing a reference potential of the high-pass filter, and then causes the vibrator to produce the driving vibrations while fixing the reference potential.Type: GrantFiled: November 26, 2007Date of Patent: September 27, 2011Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
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Publication number: 20110121907Abstract: A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that converts a current that flows through the vibrator into a voltage, an output circuit that causes the vibrator to produce the driving vibrations based on a signal that is converted into a voltage with respect to a given voltage, and a high-pass filter that is provided in the oscillation loop between the current-voltage converter and the output circuit. The driver device causes the vibrator to produce the driving vibrations while changing a reference potential of the high-pass filter, and then causes the vibrator to produce the driving vibrations while fixing the reference potential.Type: ApplicationFiled: November 26, 2007Publication date: May 26, 2011Applicant: SEIKO EPSON CORPORATIONInventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
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Patent number: 7895894Abstract: A driver device includes a gain control amplifier that causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, a signal generation circuit that generates a signal having a given frequency, and a modulation circuit that modulates the frequency of the signal generated by the signal generation circuit to a resonance frequency of the vibrator. The driver device causes the vibrator to produce the driving vibrations using the signal modulated by the modulation circuit, and then causes the vibrator to produce the driving vibrations by controlling the oscillation amplitude in the oscillation loop formed by the vibrator and the gain control amplifier.Type: GrantFiled: November 2, 2007Date of Patent: March 1, 2011Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
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Patent number: 7868623Abstract: A detection circuit includes a detection terminal to which an alternating current signal from a physical quantity transducer is input, a detection current/voltage conversion amplifier circuit that converts the alternating current signal input through the detection terminal into a voltage signal, an evaluation terminal that supplies an evaluation voltage signal to the detection current/voltage conversion amplifier circuit, an input resistor that has a given resistance ratio with respect to a feedback resistor; and a switch circuit of the detection circuit provided in a signal path that connects the evaluation terminal and an input node of the detection current/voltage conversion amplifier circuit.Type: GrantFiled: June 3, 2008Date of Patent: January 11, 2011Assignee: Seiko Epson CorporationInventors: Naoki Yoshida, Masahiro Kanai, Eitaro Otsuka
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Patent number: 7859351Abstract: An oscillation driver circuit includes a current-voltage converter which converts a current value of an oscillation signal in an oscillation loop into a voltage value, and a comparator which outputs a signal corresponding to the result of comparison between the output signal from the current-voltage converter and a given reference signal. The comparator has an output current limiting function. The oscillation driver circuit causes the vibrator to produce driving vibrations based on the output from the comparator.Type: GrantFiled: September 7, 2007Date of Patent: December 28, 2010Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida, Akihiro Fukuzawa
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Patent number: 7849746Abstract: A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that is provided in the oscillation loop and converts a current that flows through the vibrator into a voltage, and a GCA as a comparator that is provided in the oscillation loop and outputs a signal corresponding to a comparison result between an output from the current-voltage converter and a given voltage. The GCA outputs a first high-level voltage or a low-level voltage during oscillation startup, and outputs a second high-level voltage or the low-level voltage in a steady oscillation state. The first high-level voltage is a voltage higher in potential than the second high-level voltage.Type: GrantFiled: November 26, 2007Date of Patent: December 14, 2010Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
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Patent number: 7849744Abstract: An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a signal in the oscillation loop. The oscillation driver circuit sets a gain in a first oscillation loop including the vibrator and the comparator to be larger than unity using an output from the comparator, and then causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in a second oscillation loop including the vibrator and the gain control amplifier in at least one of an oscillation startup state and a sleep mode.Type: GrantFiled: July 31, 2007Date of Patent: December 14, 2010Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida
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Patent number: 7812681Abstract: An oscillation driver circuit includes a gain control amplifier which causes a vibrator to produce driving vibrations by controlling an oscillation amplitude in an oscillation loop, and a comparator which generates a synchronous detection reference signal based on a signal in the oscillation loop. The comparator has an output current limiting function. The oscillation driver circuit causes the vibrator to produce vibrations using an output from the comparator in a state in which the gain in an oscillation loop formed by the vibrator and the comparator is set to be larger than unity, and then causes the vibrator to produce the driving vibrations by controlling an oscillation amplitude in an oscillation loop formed by the vibrator and the gain control amplifier.Type: GrantFiled: October 12, 2007Date of Patent: October 12, 2010Assignee: Seiko) Epson CorporationInventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida, Akihiro Fukuzawa
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Patent number: 7808334Abstract: An oscillation driver circuit that drives a physical quantity transducer includes a one-input/two-output comparator. The one-input/two-output comparator includes a shared differential section that compares a voltage signal input from a drive current/voltage conversion amplifier circuit with a given voltage, a first output section that receives a signal output from the differential section, variably adjusts a voltage amplitude of the received signal, and outputs the resulting signal, and a second output section that receives the signal output from the differential section, and outputs a synchronous detection reference signal of which the voltage amplitude is fixed.Type: GrantFiled: July 22, 2008Date of Patent: October 5, 2010Assignee: Seiko Epson CorporationInventors: Naoki Yoshida, Masahiro Kanai, Eitaro Otsuka
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Patent number: 7791979Abstract: When the input write data is a value of a value greater than the existing data of the memory array 100, the semiconductor memory device enables writing of input write data to the memory array 100. In specific terms, the increment controller 150 reads the existing data from the memory array 100, and compares it with the write data latched to the 8-bit latch register 170. When the value of the write data is a value greater than the existing data, the increment controller 150 outputs the write enable signal WEN1 to the write/read controller 140, and executes writing of the write data latched to the 8-bit latch register 170 to the memory array 100.Type: GrantFiled: March 11, 2009Date of Patent: September 7, 2010Assignee: Seiko Epson CorporationInventors: Noboru Asauchi, Eitaro Otsuka
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Patent number: 7692506Abstract: An oscillation driver device includes a gain control amplifier, an automatic gain control circuit, and a mode setting circuit. When the mode setting circuit has switched a mode from a normal operation mode to a low power consumption mode, the automatic gain control circuit is disabled, and the gain in an oscillation loop that drives the vibrator changes from a state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit to a state in which the gain in the oscillation loop is set to be larger than unity. When the mode setting circuit has switched the mode from the low power consumption mode to the normal operation mode, the automatic gain control circuit resumes operation, and the gain in the oscillation loop changes from the state in which the gain in the oscillation loop is set to be larger than unity to the state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit.Type: GrantFiled: July 28, 2008Date of Patent: April 6, 2010Assignee: Seiko Epson CorporationInventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida
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Publication number: 20090225609Abstract: When the input write data is a value of a value greater than the existing data of the memory array 100, the semiconductor memory device enables writing of input write data to the memory array 100. In specific terms, the increment controller 150 reads the existing data from the memory array 100, and compares it with the write data latched to the 8-bit latch register 170. When the value of the write data is a value greater than the existing data, the increment controller 150 outputs the write enable signal WEN1 to the write/read controller 140, and executes writing of the write data latched to the 8-bit latch register 170 to the memory array 100.Type: ApplicationFiled: March 11, 2009Publication date: September 10, 2009Applicant: Seiko Epson CorporationInventors: Noboru Asauchi, Eitaro Otsuka
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Publication number: 20090133496Abstract: An oscillation driver circuit includes a current-voltage converter which converts a current value of an oscillation signal in an oscillation loop into a voltage value, and a comparator which outputs a signal corresponding to the result of comparison between the output signal from the current-voltage converter and a given reference signal. The comparator has an output current limiting function. The oscillation driver circuit causes the vibrator to produce driving vibrations based on the output from the comparator.Type: ApplicationFiled: September 7, 2007Publication date: May 28, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Masahiro Kanai, Eitaro Otsuka, Naoki Yoshida, Akihiro Fukuzawa
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Patent number: 7522470Abstract: When the input write data is a value of a value greater than the existing data of the memory array 100, the semiconductor memory device enables writing of input write data to the memory array 100. In specific terms, the increment controller 150 reads the existing data from the memory array 100, and compares it with the write data latched to the 8-bit latch register 170. When the value of the write data is a value greater than the existing data, the increment controller 150 outputs the write enable signal WEN1 to the write/read controller 140, and executes writing of the write data latched to the 8-bit latch register 170 to the memory array 100.Type: GrantFiled: May 26, 2006Date of Patent: April 21, 2009Assignee: Seiko Epson CorporationInventors: Noboru Asauchi, Eitaro Otsuka
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Publication number: 20090084180Abstract: An oscillation driver circuit that drives a physical quantity transducer includes a one-input/two-output comparator. The one-input/two-output comparator includes a shared differential section that compares a voltage signal input from a drive current/voltage conversion amplifier circuit with a given voltage, a first output section that receives a signal output from the differential section, variably adjusts a voltage amplitude of the received signal, and outputs the resulting signal, and a second output section that receives the signal output from the differential section, and outputs a synchronous detection reference signal of which the voltage amplitude is fixed.Type: ApplicationFiled: July 22, 2008Publication date: April 2, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Naoki YOSHIDA, Masahiro KANAI, Eitaro OTSUKA
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Publication number: 20090078045Abstract: A driver device that forms an oscillation loop with a vibrator and causes the vibrator to produce driving vibrations includes a current-voltage converter that is provided in the oscillation loop and converts a current that flows through the vibrator into a voltage, and a GCA as a comparator that is provided in the oscillation loop and outputs a signal corresponding to a comparison result between an output from the current-voltage converter and a given voltage. The GCA outputs a first high-level voltage or a low-level voltage during oscillation startup, and outputs a second high-level voltage or the low-level voltage in a steady oscillation state. The first high-level voltage is a voltage higher in potential than the second high-level voltage.Type: ApplicationFiled: November 26, 2007Publication date: March 26, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Masahiro Kanai, Naoki Yoshida, Eitaro Otsuka
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Patent number: 7499372Abstract: When writing 16-bit write data to the memory array 100 which can store data of 8 bits per 1 row, the semiconductor memory device 10 first writes the upper 8 bits to the 1st write restricted row of the memory array 100. The increment controller 150 determines whether or not the value of the existing data written to the memory array 100 and the write data used for writing latched to the 8-bit latch register 170 match. When the existing data and the write data match, the increment controller 150 outputs the write enable signal WEN1 to the write/read controller 140 and executes the writing of the lower 8 bits of write data to the memory array 100.Type: GrantFiled: May 26, 2006Date of Patent: March 3, 2009Assignee: Seiko Epson CorporationInventors: Noboru Asauchi, Eitaro Otsuka
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Publication number: 20090033432Abstract: An oscillation driver device includes a gain control amplifier, an automatic gain control circuit, and a mode setting circuit. When the mode setting circuit has switched a mode from a normal operation mode to a low power consumption mode, the automatic gain control circuit is disabled, and the gain in an oscillation loop that drives the vibrator changes from a state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit to a state in which the gain in the oscillation loop is set to be larger than unity. When the mode setting circuit has switched the mode from the low power consumption mode to the normal operation mode, the automatic gain control circuit resumes operation, and the gain in the oscillation loop changes from the state in which the gain in the oscillation loop is set to be larger than unity to the state in which the gain in the oscillation loop is controlled to be unity by the automatic gain control circuit.Type: ApplicationFiled: July 28, 2008Publication date: February 5, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Masahiro KANAI, Eitaro Otsuka, Naoki Yoshida
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Publication number: 20090013785Abstract: A detection circuit includes a detection terminal to which an alternating current signal from a physical quantity transducer is input, a detection current/voltage conversion amplifier circuit that converts the alternating current signal input through the detection terminal into a voltage signal, an evaluation terminal that supplies an evaluation voltage signal to the detection current/voltage conversion amplifier circuit, an input resistor that has a given resistance ratio with respect to a feedback resistor; and a switch circuit of the detection circuit provided in a signal path that connects the evaluation terminal and an input node of the detection current/voltage conversion amplifier circuit.Type: ApplicationFiled: June 3, 2008Publication date: January 15, 2009Applicant: SEIKO EPSON CORPORATIONInventors: Naoki Yoshida, Masahiro Kanai, Eitaro Otsuka
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Publication number: 20080212379Abstract: When writing 16-bit write data to the memory array 100 which can store data of 8 bits per 1 row, the semiconductor memory device 10 first writes the upper 8 bits to the 1st write restricted row of the memory array 100. The increment controller 150 determines whether or not the value of the existing data written to the memory array 100 and the write data used for writing latched to the 8-bit latch register 170 match. When the existing data and the write data match, the increment controller 150 outputs the write enable signal WEN1 to the write/read controller 140 and executes the writing of the lower 8 bits of write data to the memory array 100.Type: ApplicationFiled: May 26, 2006Publication date: September 4, 2008Inventors: Noboru Asauchi, Eitaro Otsuka