Patents by Inventor Takamasa Sakuragi
Takamasa Sakuragi 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: 10764524Abstract: Provided is an imaging apparatus, including: a photoelectric conversion element; an amplifier transistor configured to output a voltage corresponding to electric charges generated by the photoelectric conversion element; a load transistor configured to supply a bias current to the amplifier transistor; and a voltage supply unit configured to input one of a first voltage and a second voltage, which have different voltage values, to a control node of the load transistor via an input capacitor. In the imaging apparatus, a current value of the bias current to be supplied by the load transistor at a time when the second voltage is input to the control node via the input capacitor is larger than a current value of the bias current to be supplied by the load transistor at a time when the first voltage is input to the control node via the input capacitor.Type: GrantFiled: February 21, 2018Date of Patent: September 1, 2020Assignee: CANON KABUSHIKI KAISHAInventor: Takamasa Sakuragi
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Patent number: 10425600Abstract: Provided is a solid state imaging device including: pixels arranged in a first direction and provided in a pixel well region, each of the pixels including a photoelectric conversion element and a pixel output unit configured to output a pixel signal based on a signal generated by the photoelectric conversion element; a first wiring connected to the pixel output unit of each of the pixels and arranged extending in the first direction; a second wiring arranged extending in a direction corresponding to the first direction; a third wiring connected to the second wiring at a connection portion located inside the pixel well region in a planar view; and a differential amplification circuit having two input terminals. The pixel signal is input to one of the input terminals via the first wiring, and a potential of the third wiring is input to the other of the input terminals.Type: GrantFiled: January 4, 2018Date of Patent: September 24, 2019Assignee: CANON KABUSHIKI KAISHAInventor: Takamasa Sakuragi
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Patent number: 10205899Abstract: Image sensor has pixel including photoelectric converter, pixel amplifier having input portion to receive signal from the photoelectric converter, and switch to connect reset terminal to the input portion. The sensor includes signal line to receive signal from the pixel amplifier, reset line connected to the reset terminal, and reset portion to reset voltage of the input portion. The reset portion includes capacitor to hold, in first period, second voltage appearing at the signal line in response to application of first voltage to the input portion, and supplier configured to set, in second period after the first period, the input portion to reset voltage via the switch by supplying third voltage corresponding to the second voltage held by the capacitor to the reset terminal via the reset line.Type: GrantFiled: February 8, 2017Date of Patent: February 12, 2019Assignee: Canon Kabushiki KaishaInventor: Takamasa Sakuragi
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Patent number: 10165214Abstract: An imaging device according to an exemplary embodiment includes a plurality of pixels, a differential amplifier circuit that includes a plurality of transistors forming a differential pair, and a current source configured to supply a bias current to the plurality of transistors, and is configured to receive a signal from the plurality of pixels, a capacitor element including a first terminal and a second terminal, a first switch through which the first terminal is connected to an electric path between the current source and the plurality of transistors, and a second switch through which the first terminal is connected to a voltage supply node supplied with a voltage.Type: GrantFiled: June 1, 2016Date of Patent: December 25, 2018Assignee: CANON KABUSHIKI KAISHAInventor: Takamasa Sakuragi
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Publication number: 20180220089Abstract: Provided is a solid state imaging device including: pixels arranged in a first direction and provided in a pixel well region, each of the pixels including a photoelectric conversion element and a pixel output unit configured to output a pixel signal based on a signal generated by the photoelectric conversion element; a first wiring connected to the pixel output unit of each of the pixels and arranged extending in the first direction; a second wiring arranged extending in a direction corresponding to the first direction; a third wiring connected to the second wiring at a connection portion located inside the pixel well region in a planar view; and a differential amplification circuit having two input terminals. The pixel signal is input to one of the input terminals via the first wiring, and a potential of the third wiring is input to the other of the input terminals.Type: ApplicationFiled: January 4, 2018Publication date: August 2, 2018Inventor: Takamasa Sakuragi
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Patent number: 10033953Abstract: Provided is a solid state imaging device including a plurality of pixels, a signal line on which a pixel signal is transmitted, a load transistor having a drain connected to the signal line, a readout circuit that reads out the pixel signal from the signal line, and a control unit that controls a current flowing in the load transistor in accordance with a potential of a control terminal. When a reference potential of the pixel fluctuates relatively to a reference potential of the readout circuit, a potential of the control terminal relative to a potential of a source of the load transistor is changed in a same phase with a fluctuation of the reference potential of the pixel.Type: GrantFiled: September 7, 2016Date of Patent: July 24, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Masaaki Minowa, Keisuke Ota, Takahiro Yamasaki, Takamasa Sakuragi, Noriyuki Kaifu
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Publication number: 20180184033Abstract: Provided is an imaging apparatus, including: a photoelectric conversion element; an amplifier transistor configured to output a voltage corresponding to electric charges generated by the photoelectric conversion element; a load transistor configured to supply a bias current to the amplifier transistor; and a voltage supply unit configured to input one of a first voltage and a second voltage, which have different voltage values, to a control node of the load transistor via an input capacitor. In the imaging apparatus, a current value of the bias current to be supplied by the load transistor at a time when the second voltage is input to the control node via the input capacitor is larger than a current value of the bias current to be supplied by the load transistor at a time when the first voltage is input to the control node via the input capacitor.Type: ApplicationFiled: February 21, 2018Publication date: June 28, 2018Inventor: Takamasa Sakuragi
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Patent number: 9986190Abstract: Provided is an imaging apparatus, including: a photoelectric conversion element; an amplifier transistor configured to output a voltage corresponding to electric charges generated by the photoelectric conversion element; a load transistor configured to supply a bias current to the amplifier transistor; and a voltage supply unit configured to input one of a first voltage and a second voltage, which have different voltage values, to a control node of the load transistor via an input capacitor. In the imaging apparatus, a current value of the bias current to be supplied by the load transistor at a time when the second voltage is input to the control node via the input capacitor is larger than a current value of the bias current to be supplied by the load transistor at a time when the first voltage is input to the control node via the input capacitor.Type: GrantFiled: April 30, 2015Date of Patent: May 29, 2018Assignee: CANON KABUSHIKI KAISHAInventor: Takamasa Sakuragi
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Patent number: 9979916Abstract: An imaging apparatus includes: a first signal processing circuit arranged in a first direction to process a signal from a first group of pixels; a second signal processing circuit arranged in a second direction to process a signal from a second group of pixels; a first external connecting terminal arranged in the first direction to supply a first potential to the first signal processing circuit; a second external connecting terminal arranged in the second direction to supply the first potential to the second signal processing circuit; a third external connecting terminal arranged in the first direction to supply a second potential to the first group of pixels; and a fourth external connecting terminal arranged in the second direction to supply the second potential to the second group of pixels.Type: GrantFiled: November 2, 2015Date of Patent: May 22, 2018Assignee: CANON KABUSHIKI KAISHAInventors: Hiroki Hiyama, Takamasa Sakuragi, Junji Iwata, Hiroaki Kameyama, Tomoya Kumagai, Keisuke Ota
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Patent number: 9954026Abstract: An imaging apparatus includes a pixel configured to generate a signal in accordance with an incident light by a photoelectric conversion; a differential amplifier including a first input terminal to which a voltage based on the signal from the pixel is input, and a second input terminal to which a reference voltage is input; a current supply unit configured to supply a bias current to the differential amplifier; and a comparing unit configured to compare the voltage of the first input terminal of the differential amplifier with a threshold voltage, and configured to output a control signal based on a comparison result to the current supply unit, and the current supply unit changes a magnitude of the bias current supplied to the differential amplifier in accordance with the control signal input from the comparing unit.Type: GrantFiled: July 22, 2016Date of Patent: April 24, 2018Assignee: CANON KABUSHIKI KAISHAInventor: Takamasa Sakuragi
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Patent number: 9900539Abstract: Provided is a solid-state image pickup element including: a plurality of pixels arranged in a pixel well region; a readout circuit arranged in a peripheral well region, having a first input terminal for receiving the pixel signals from the plurality of pixels and a second input terminal for receiving a reference signal; and a reference signal circuit arranged in the peripheral well region, having a first electrode to which a ground voltage is supplied, and being configured to output the reference signal to the second input terminal of the readout circuit, wherein a resistance value R1 of an electrical path from one of a plurality of pixel well contacts to the first electrode and a resistance value R2 of an electrical path from one of a plurality of peripheral well contacts closest to the first electrode to the first electrode satisfy a relationship of R1<R2.Type: GrantFiled: August 3, 2016Date of Patent: February 20, 2018Assignee: Canon Kabushiki KaishaInventors: Takahiro Yamasaki, Masaaki Minowa, Keisuke Ota, Takamasa Sakuragi, Noriyuki Kaifu, Toru Koizumi, Kazuhiro Saito, Daisuke Kobayashi
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Publication number: 20170244918Abstract: Image sensor has pixel including photoelectric converter, pixel amplifier having input portion to receive signal from the photoelectric converter, and switch to connect reset terminal to the input portion. The sensor includes signal line to receive signal from the pixel amplifier, reset line connected to the reset terminal, and reset portion to reset voltage of the input portion. The reset portion includes capacitor to hold, in first period, second voltage appearing at the signal line in response to application of first voltage to the input portion, and supplier configured to set, in second period after the first period, the input portion to reset voltage via the switch by supplying third voltage corresponding to the second voltage held by the capacitor to the reset terminal via the reset line.Type: ApplicationFiled: February 8, 2017Publication date: August 24, 2017Inventor: Takamasa Sakuragi
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Patent number: 9667892Abstract: An image sensor includes a semiconductor chip and a package covering the semiconductor chip. The semiconductor chip includes a pixel portion including a plurality of pixels, a memory, a readout unit configured to write, in the memory, a signal corresponding to a signal from the pixel portion, an output unit configured to output an image signal corresponding to the signal written in the memory, a control unit configured to output a control signal to an output pin of the package via an output pad of the semiconductor chip, and a pad to which a power supply voltage is supplied from outside the semiconductor chip. The control signal is a signal indicating a period during which the signal corresponding to the signal from the pixel portion is written in the memory of the readout unit.Type: GrantFiled: October 6, 2014Date of Patent: May 30, 2017Assignee: Canon Kabushiki KaishaInventor: Takamasa Sakuragi
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Patent number: 9635297Abstract: An image capturing apparatus includes a solid-state image sensor, a support member for the sensor, and electrically conductive members. The conductive members are electrically connected to the sensor, attached to support member, and arranged in a direction along one side of the sensor. The sensor is configured to receive a power supply voltage via a first conductive member, receive a ground voltage via a second conductive member, and transmit a signal via a third conductive member. The first and second conductive members are located on one side in the direction with respect to the third conductive member. The conductive members do not include a conductive member configured to supply a power supply voltage or a ground voltage to the sensor on the other side of the direction with respect to the third conductive member.Type: GrantFiled: October 3, 2014Date of Patent: April 25, 2017Assignee: Canon Kabushiki KaishaInventor: Takamasa Sakuragi
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Publication number: 20170099448Abstract: Provided is a solid state imaging device including a plurality of pixels, a signal line on which a pixel signal is transmitted, a load transistor having a drain connected to the signal line, a readout circuit that reads out the pixel signal from the signal line, and a control unit that controls a current flowing in the load transistor in accordance with a potential of a control terminal. When a reference potential of the pixel fluctuates relatively to a reference potential of the readout circuit, a potential of the control terminal relative to a potential of a source of the load transistor is changed in a same phase with a fluctuation of the reference potential of the pixel.Type: ApplicationFiled: September 7, 2016Publication date: April 6, 2017Inventors: Masaaki Minowa, Keisuke Ota, Takahiro Yamasaki, Takamasa Sakuragi, Noriyuki Kaifu
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Publication number: 20170078603Abstract: Provided is a solid-state image pickup element including: a plurality of pixels arranged in a pixel well region; a readout circuit arranged in a peripheral well region, having a first input terminal for receiving the pixel signals from the plurality of pixels and a second input terminal for receiving a reference signal; and a reference signal circuit arranged in the peripheral well region, having a first electrode to which a ground voltage is supplied, and being configured to output the reference signal to the second input terminal of the readout circuit, wherein a resistance value R1 of an electrical path from one of a plurality of pixel well contacts to the first electrode and a resistance value R2 of an electrical path from one of a plurality of peripheral well contacts closest to the first electrode to the first electrode satisfy a relationship of R1<R2.Type: ApplicationFiled: August 3, 2016Publication date: March 16, 2017Inventors: Takahiro Yamasaki, Masaaki Minowa, Keisuke Ota, Takamasa Sakuragi, Noriyuki Kaifu, Toru Koizumi, Kazuhiro Saito, Daisuke Kobayashi
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Publication number: 20170048475Abstract: An imaging apparatus includes a pixel configured to generate a signal in accordance with an incident light by a photoelectric conversion; a differential amplifier including a first input terminal to which a voltage based on the signal from the pixel is input, and a second input terminal to which a reference voltage is input; a current supply unit configured to supply a bias current to the differential amplifier; and a comparing unit configured to compare the voltage of the first input terminal of the differential amplifier with a threshold voltage, and configured to output a control signal based on a comparison result to the current supply unit, and the current supply unit changes a magnitude of the bias current supplied to the differential amplifier in accordance with the control signal input from the comparing unit.Type: ApplicationFiled: July 22, 2016Publication date: February 16, 2017Inventor: Takamasa Sakuragi
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Publication number: 20160360137Abstract: An imaging device according to an exemplary embodiment includes a plurality of pixels, a differential amplifier circuit that includes a plurality of transistors forming a differential pair, and a current source configured to supply a bias current to the plurality of transistors, and is configured to receive a signal from the plurality of pixels, a capacitor element including a first terminal and a second terminal, a first switch through which the first terminal is connected to an electric path between the current source and the plurality of transistors, and a second switch through which the first terminal is connected to a voltage supply node supplied with a voltage.Type: ApplicationFiled: June 1, 2016Publication date: December 8, 2016Inventor: Takamasa Sakuragi
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Publication number: 20160150176Abstract: An imaging apparatus includes: a first signal processing circuit arranged in a first direction to process a signal from a first group of pixels; a second signal processing circuit arranged in a second direction to process a signal from a second group of pixels; a first external connecting terminal arranged in the first direction to supply a first potential to the first signal processing circuit; a second external connecting terminal arranged in the second direction to supply the first potential to the second signal processing circuit; a third external connecting terminal arranged in the first direction to supply a second potential to the first group of pixels; and a fourth external connecting terminal arranged in the second direction to supply the second potential to the second group of pixels.Type: ApplicationFiled: November 2, 2015Publication date: May 26, 2016Inventors: Hiroki Hiyama, Takamasa Sakuragi, Junji Iwata, Hiroaki Kameyama, Tomoya Kumagai, Keisuke Ota
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Publication number: 20160014356Abstract: A solid-state imaging device includes a plurality of pixels each of which has a photoelectric conversion element and a pixel output portion and which are arranged in a column direction, a first wiring connected to the pixel output portions of the plurality of pixels, a differential amplifier circuit whose one input terminal is connected to the first wiring, a second wiring connected to the other input terminal of the differential amplifier circuit, a third wiring which is formed so as to extend in the column direction and is connected to a first pad, a plurality of switches connected between the second and third wirings, and a control unit for driving the switch at a position corresponding to the position of the pixel in which the pixel output portion is driven in association with the driving of the pixel output portion.Type: ApplicationFiled: June 26, 2015Publication date: January 14, 2016Inventor: Takamasa Sakuragi