Patents by Inventor Ryota Sekiguchi
Ryota Sekiguchi 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: 9349881Abstract: Provided is a diode element, a detecting device, and the like which solve problems of a conventional lateral diode element. In the conventional element, a semiconductor interface appears in current path between two electrodes on a surface thereof, and thus noise caused by the interface is large. The diode element includes: a first-conductive-type low carrier concentration layer; a first-conductive-type high carrier concentration layer; and a Schottky electrode and an ohmic electrode which are formed on a semiconductor surface. The low carrier layer has a carrier concentration that is lower than that of the high carrier layer. The diode element includes a first-conductive-type impurity introducing region formed below the ohmic electrode, and includes a second-conductive-type impurity introducing region so as not to be in electrical contact with the Schottky electrode on the semiconductor surface between the Schottky and the ohmic.Type: GrantFiled: June 27, 2012Date of Patent: May 24, 2016Assignee: CANON KABUSHIKI KAISHAInventors: Ryota Sekiguchi, Makoto Koto
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Publication number: 20160094183Abstract: The invention provides an electromagnetic wave generation device. The device includes a substrate provided with a terahertz wave oscillation section including a resonant tunneling diode structure, a two-dimensional electron layer having a semiconductor heterojunction structure, and a transistor section including a source electrode and a drain electrode provided at end portions of the two-dimensional electron layer and a gate electrode provided above the two-dimensional electron layer. The terahertz wave output of the terahertz wave oscillation section changes distribution of electrons in the two-dimensional electron layer.Type: ApplicationFiled: December 9, 2015Publication date: March 31, 2016Inventors: Toshihiko Ouchi, Ryota Sekiguchi
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Publication number: 20160041091Abstract: An oscillation element includes an antenna for oscillation configured to oscillate electromagnetic waves, and multiple negative resistance elements electrically connected to the antenna in parallel, and the multiple negative resistance elements are disposed in only a place where the phases of electromagnetic waves oscillated therefrom are the common phase or opposite phase.Type: ApplicationFiled: October 16, 2015Publication date: February 11, 2016Inventors: Ryota Sekiguchi, Masahiro Okuda
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Patent number: 9244331Abstract: An electromagnetic wave generating device is provided which includes an optical waveguide including a plurality of waveguide segments such that the main lobe of a combined electromagnetic wave has a substantially single large directivity. The electromagnetic wave generating device includes the optical waveguide including a plurality of waveguide segments each of which is sandwiched between dielectrics and includes a nonlinear optical crystal. The waveguide segments are arranged such that an angle formed by the directions of propagation of light in the two adjacent waveguide segments substantially corresponds to 2?c. When ng denotes the refractive index of the nonlinear optical crystal for light and ?eff denotes the effective relative permittivity of an assembly of the dielectrics and the waveguide segments for an electromagnetic wave, ?c is defined as ?c=cos?1 (ng/???eff).Type: GrantFiled: August 8, 2011Date of Patent: January 26, 2016Assignee: Canon Kabushiki KaishaInventors: Ryota Sekiguchi, Kousuke Kajiki
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Patent number: 9236833Abstract: The invention provides an electromagnetic wave generation device. The device includes a substrate provided with a terahertz wave oscillation section including a resonant tunneling diode structure, a two-dimensional electron layer having a semiconductor heterojunction structure, and a transistor section including a source electrode and a drain electrode provided at end portions of the two-dimensional electron layer and a gate electrode provided above the two-dimensional electron layer. The terahertz wave output of the terahertz wave oscillation section changes distribution of electrons in the two-dimensional electron layer.Type: GrantFiled: January 14, 2014Date of Patent: January 12, 2016Assignee: Canon Kabushiki KaishaInventors: Toshihiko Ouchi, Ryota Sekiguchi
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Patent number: 9231521Abstract: An oscillator oscillates a terahertz wave of a frequency fosc defined by a microstrip resonator configured such that a negative resistance element and a dielectric body are sandwiched between two conductors. The oscillator includes a resistance element disposed in parallel to the negative resistance element. The resistance element is disposed in a position corresponding to a node of an electric field stably existing in the resonator in the frequency fosc of the oscillated terahertz wave.Type: GrantFiled: March 26, 2014Date of Patent: January 5, 2016Assignee: Canon Kabushiki KaishaInventors: Yasushi Koyama, Ryota Sekiguchi
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Publication number: 20150365611Abstract: Provided by the present invention is an image forming apparatus wherein a signal to noise ratio is improved without reducing a video rate of a real-time moving image. The image forming apparatus comprises: a pixel 101 having an electromagnetic wave detecting element 111 configured to detect an electromagnetic wave; a switch 110 configured to read out a signal from the pixel; a signal generating unit 102 configured to generate a signal 114 having a predetermined period, wherein the pixel is connected to a transmission line 103 for supplying, to the pixel, the signal having the predetermined period, and to a scanning line 106 and 107 for reading out the signal from the pixel through the switch, and the pixel has a frequency converting element 113 configured to convert a frequency of a detection signal of the electromagnetic wave detecting element, using the signal having the predetermined period.Type: ApplicationFiled: February 25, 2014Publication date: December 17, 2015Applicant: Canon Kabushiki KaishaInventors: Ryota Sekiguchi, Toshihiko Ouchi
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Patent number: 9197156Abstract: An oscillation element includes an antenna for oscillation configured to oscillate electromagnetic waves, and multiple negative resistance elements electrically connected to the antenna in parallel, and the multiple negative resistance elements are disposed in only a place where the phases of electromagnetic waves oscillated therefrom are the common phase or opposite phase.Type: GrantFiled: January 18, 2013Date of Patent: November 24, 2015Assignee: Canon Kabushiki KaishaInventors: Ryota Sekiguchi, Masahiro Okuda
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Patent number: 9184697Abstract: An oscillation device comprises a substrate and a plurality of resonance structures arranged on the substrate to resonate electromagnetic waves. Each of the plurality of resonance structures has a negative differential resistance device for generating electromagnetic waves, a first conductor arranged electrically in contact with the negative differential resistance device and a second conductor arranged electrically in contact with the negative differential resistance device and disposed on the opposite side to the first conductor with respect to the negative differential resistance device. Adjacently located resonance structures of the plurality of resonance structures are interconnected by means of a metal part adapted for capacitive coupling with the first conductors thereof. The plurality of resonance structures are arranged so as to be separated from each other at least by a distance not greater than a wavelength of electromagnetic waves to be oscillated by them.Type: GrantFiled: March 7, 2014Date of Patent: November 10, 2015Assignee: CANON KABUSHIKI KAISHAInventors: Ryota Sekiguchi, Yasushi Koyama
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Patent number: 9087935Abstract: Provided is a rectifier such as a detector in which a cutoff frequency may be increased in a view point different from the reduction in size of the structure. The rectifier includes: a Schottky barrier portion including a Schottky electrode; a barrier portion having a rectifying property with respect to a majority carrier in the Schottky barrier portion; and an ohmic electrode in electrical contact with the barrier portion having the rectifying property, in which each of the Schottky barrier portion and the barrier portion having the rectifying property has an asymmetrical band profile whose gradient on one side is larger than a gradient of another side, and the Schottky barrier portion and the barrier portion having the rectifying property are connected to each other so that the steep gradient side of the band profile is located on a side of the Schottky electrode.Type: GrantFiled: July 27, 2009Date of Patent: July 21, 2015Assignee: CANON KABUSHIKI KAISHAInventor: Ryota Sekiguchi
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Patent number: 9018672Abstract: Provided is a semiconductor device including: a semiconductor element arranged on a substrate and having two electrodes; a conductive strip in contact with one of the two electrodes; and a dielectric arranged between another one of the two electrodes and the conductive strip, in which the conductive strip has an opening formed therein, the dielectric has a void formed therein, and the opening and the void are connected to each other.Type: GrantFiled: November 15, 2013Date of Patent: April 28, 2015Assignee: Canon Kabushiki KaishaInventors: Ryota Sekiguchi, Alexis Debray, Yasushi Koyama, Kosuke Asano, Satoshi Yokoyama, Atsushi Kemmochi
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Patent number: 9019025Abstract: An oscillator configured to oscillate an electromagnetic wave, including: a negative resistance device; a microstrip resonator configured to determine an oscillation frequency of an electromagnetic wave excited by the negative resistance device; a resistance device and a capacitance device, which form a low-impedance circuit configured to suppress parasitic oscillation; and a strip conductor configured to connect the capacitance device of the low-impedance circuit and the microstrip resonator to each other, in which an inductance L of the strip conductor and a capacitance C of the microstrip resonator produce a resonance frequency of ½??LC, and ¼ of an equivalent wavelength of the resonance frequency is larger than a distance between the negative resistance device and the resistance device of the low-impedance circuit via the strip conductor, is provided.Type: GrantFiled: May 14, 2013Date of Patent: April 28, 2015Assignee: Canon Kabushiki KaishaInventor: Ryota Sekiguchi
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Patent number: 8982342Abstract: A method of calculating, using a computer, a refractive index of at least a portion of a specimen by using electromagnetic wave measurement. The method includes measuring a first scattered waveform from a structure of the specimen, measuring a second scattered waveform from a structure, in which a material for calculating a refractive index is disposed on a surface of the specimen, and comparing intensities of peak positions at corresponding portions of the first scattered waveform and the second scattered waveform.Type: GrantFiled: March 1, 2013Date of Patent: March 17, 2015Assignee: Canon Kabushiki KaishaInventors: Ryota Sekiguchi, Oichi Kubota
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Patent number: 8981859Abstract: An oscillator includes a resonator section structured such that a dielectric is interposed between first and second conductors and such that the first and second conductors are electrically connected to a resonant tunneling diode, a capacitor section structured such that the dielectric is interposed between the first and second conductors, a line section configured to electrically connect the resonator section and the capacitor section in parallel to each other, and a resistor section configured to electrically connect the first and second conductors to each other. A first position of the resonator section and a second position of the capacitor section are connected to each other by the line section so that the first position and the second position are substantially electrically equivalent to each other in a wavelength range larger than a wavelength of an electromagnetic wave that resonates in the resonator section.Type: GrantFiled: March 5, 2013Date of Patent: March 17, 2015Assignee: Canon Kabushiki KaishaInventors: Yasushi Koyama, Ryota Sekiguchi
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Patent number: 8896389Abstract: The present disclosure relates to an oscillation circuit including a differential negative resistance element, a resonance circuit connected to the differential negative resistance element, and a stabilization circuit connected in parallel with the negative resistance element to suppress parasitic oscillation. The stabilization circuit includes a variable shunt resistor and an adjusting device for adjusting the shunt resistor.Type: GrantFiled: August 13, 2010Date of Patent: November 25, 2014Assignee: Canon Kabushiki KaishaInventors: Yasushi Koyama, Ryota Sekiguchi
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Publication number: 20140326890Abstract: An imager for obtaining an image of an object includes a substrate including a plurality of electrical emitting units for emitting electromagnetic waves and a plurality of electrical detecting units for detecting the electromagnetic waves reflected by the object. Each emitting unit includes an electrical emitter, a first antenna, a first metallic reflector, and a first dielectric element between the first antenna and the first metallic reflector. Each detecting unit includes an electrical detector, a second antenna, a second metallic reflector, and a second dielectric element between the second antenna and the second metallic reflector.Type: ApplicationFiled: April 30, 2014Publication date: November 6, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Alexis Debray, Ryota Sekiguchi
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Publication number: 20140292428Abstract: An oscillator oscillates a terahertz wave of a frequency fosc defined by a microstrip resonator configured such that a negative resistance element and a dielectric body are sandwiched between two conductors. The oscillator includes a resistance element disposed in parallel to the negative resistance element. The resistance element is disposed in a position corresponding to a node of an electric field stably existing in the resonator in the frequency fosc of the oscillated terahertz wave.Type: ApplicationFiled: March 26, 2014Publication date: October 2, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Yasushi Koyama, Ryota Sekiguchi
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Publication number: 20140266477Abstract: An oscillation device comprises a substrate and a plurality of resonance structures arranged on the substrate to resonate electromagnetic waves. Each of the plurality of resonance structures has a negative differential resistance device for generating electromagnetic waves, a first conductor arranged electrically in contact with the negative differential resistance device and a second conductor arranged electrically in contact with the negative differential resistance device and disposed on the opposite side to the first conductor with respect to the negative differential resistance device. Adjacently located resonance structures of the plurality of resonance structures are interconnected by means of a metal part adapted for capacitive coupling with the first conductors thereof. The plurality of resonance structures are arranged so as to be separated from each other at least by a distance not greater than a wavelength of electromagnetic waves to be oscillated by them.Type: ApplicationFiled: March 7, 2014Publication date: September 18, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Ryota Sekiguchi, Yasushi Koyama
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Publication number: 20140254615Abstract: A laser device comprises a waveguide including a resonance structure for causing electromagnetic waves to resonate. The waveguide by turn comprises a gain medium for generating electromagnetic waves, a first negative permittivity medium arranged electrically in contact with the gain medium, a second negative permittivity medium arranged electrically in contact with the gain medium at the side opposite to the first negative permittivity medium so as to dispose the gain medium between the first and second negative permittivity mediums, and lateral structures of a positive permittivity medium arranged to be in contact with lateral surfaces of the gain medium and sandwiched between the first and second negative permittivity mediums. The waveguide has a section in which the width w of the gain medium sandwiched between the lateral structures is not greater than twice of the thickness h of the lateral structures sandwiched between the first and second negative permittivity mediums.Type: ApplicationFiled: March 4, 2014Publication date: September 11, 2014Applicant: CANON KABUSHIKI KAISHAInventors: Ryota Sekiguchi, Toshihiko Ouchi
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Patent number: 8816785Abstract: An oscillator which oscillates electromagnetic waves includes a negative differential resistance element, a resonator configured to prescribe oscillation frequencies of the electromagnetic waves, a voltage modulation unit configured to modulate the negative differential resistance element, a stabilizing circuit configured to suppress parasitic oscillation, and a bias circuit, including a power supply and a line, used to control an operating point voltage of the negative differential resistance element. The voltage modulation unit is connected to the bias circuit through the stabilizing circuit.Type: GrantFiled: September 14, 2011Date of Patent: August 26, 2014Assignee: Canon Kabushiki KaishaInventor: Ryota Sekiguchi