Patents by Inventor Naosumi Waki
Naosumi Waki 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: 10126414Abstract: A proximity sensor for detecting proximity of an object, by sensing reflected light coming from an object on which a light emission pulse is reflected, the proximity sensor includes: a converter circuit configured to convert a current output from a photodetector sensing the reflected light into a voltage, and to output the voltage, magnitude of the current depending on a degree of the proximity of the object; a differential converter circuit configured to convert the voltage output by the converter circuit into a differential voltage, and to output the differential voltage; and a correlated double sampling circuit having a differential configuration, and configured to subtract a value of the differential voltage output by the differential converter circuit, sampled at falling of the light emission pulse, from a value of the differential voltage sampled at rising of the light emission pulse.Type: GrantFiled: September 6, 2017Date of Patent: November 13, 2018Assignee: MITSUMI ELECTRIC CO., LTD.Inventors: Yuya Kawasaki, Naosumi Waki
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Publication number: 20180088217Abstract: A proximity sensor for detecting proximity of an object, by sensing reflected light coming from an object on which a light emission pulse is reflected, the proximity sensor includes: a converter circuit configured to convert a current output from a photodetector sensing the reflected light into a voltage, and to output the voltage, magnitude of the current depending on a degree of the proximity of the object; a differential converter circuit configured to convert the voltage output by the converter circuit into a differential voltage, and to output the differential voltage; and a correlated double sampling circuit having a differential configuration, and configured to subtract a value of the differential voltage output by the differential converter circuit, sampled at falling of the light emission pulse, from a value of the differential voltage sampled at rising of the light emission pulse.Type: ApplicationFiled: September 6, 2017Publication date: March 29, 2018Applicant: MITSUMI ELECTRIC CO., LTD.Inventors: Yuya KAWASAKI, Naosumi WAKI
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Patent number: 8004291Abstract: A bioelectric impedance measuring circuit for applying a current to an organism and measuring a bioelectric impedance of the organism is disclosed that includes a pseudo-sine wave generating circuit for generating a pseudo-sine wave based on an input square wave, a voltage/current converting circuit for outputting current to the organism in correspondence with the pseudo-sine wave generated by the pseudo-sine wave generating circuit, and a processing circuit for generating the square wave and supplying the square wave to the pseudo-sine wave generating circuit and measuring the bioelectric impedance based on a voltage output from the voltage/current converting circuit. The pseudo-sine wave generating circuit is included in a semiconductor integrated circuit.Type: GrantFiled: July 31, 2007Date of Patent: August 23, 2011Assignee: Mitsumi Electric Co., Ltd.Inventor: Naosumi Waki
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Patent number: 7511260Abstract: An encoder device includes first through fourth photodiodes each having a rhombus shape and a length of X1 in an X direction, the photodiodes being disposed adjacent to each other in the X direction such that a line passing through a pair of opposing vertices of the rhombus shape of each of the photodiodes is parallel to an X axis; a slit member that includes light transmitting sections and light shielding sections alternately arranged, and is movable in the X direction, each of the light transmitting and shielding sections having a length of 2×X1 in the X direction; and a logic circuit that generates first and second detection signals from output signals of the photodiodes that have received lights passing through the light transmitting sections, a phase of the second detection signal being shifted by a ¼ period of the first detection signal relative to the first detection signal.Type: GrantFiled: March 30, 2006Date of Patent: March 31, 2009Assignee: Mitsumi Electric Co., Ltd.Inventors: Hideaki Sannomiya, Naosumi Waki, Yuko Kimura, Junichiro Tanaka
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Publication number: 20080036475Abstract: A bioelectric impedance measuring circuit for applying a current to an organism and measuring a bioelectric impedance of the organism is disclosed that includes a pseudo-sine wave generating circuit for generating a pseudo-sine wave based on an input square wave, a voltage/current converting circuit for outputting current to the organism in correspondence with the pseudo-sine wave generated by the pseudo-sine wave generating circuit, and a processing circuit for generating the square wave and supplying the square wave to the pseudo-sine wave generating circuit and measuring the bioelectric impedance based on a voltage output from the voltage/current converting circuit. The pseudo-sine wave generating circuit is included in a semiconductor integrated circuit.Type: ApplicationFiled: July 31, 2007Publication date: February 14, 2008Inventor: Naosumi WAKI
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Patent number: 7245233Abstract: A light receiving device is disclosed that is able to reduce jitter and to improve detection resolution. The light receiving device has plural light receiving elements each having a rectangular light receiving area. The light receiving areas are connected to each other at vertices on diagonals thereof, and sides of the light receiving areas of neighboring light receiving elements are adjacent to each other.Type: GrantFiled: March 28, 2006Date of Patent: July 17, 2007Assignee: Mitsumi Electric Co., Ltd.Inventors: Hideaki Sannomiya, Naosumi Waki, Yuko Kimura, Junichiro Tanaka
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Patent number: 7227125Abstract: An encoder device includes a first array that includes first through fourth photodiodes adjacent to each other in an X direction, each having a length of X1; a second array that includes fifth through eighth photodiodes adjacent to each other in the X direction, each having a length of X1, and is adjacent to the first array in a Y direction but displaced by X1/2 in the X direction relative to the first array; a slit member that includes light transmitting sections and light shielding section arranged alternately, each having a length 2×X1, and is movable in the X direction; and a logic circuit that generates first and second detection signals from output signals of the first through fourth photodiodes and output signals of the fifth through eighth photodiodes, respectively, a phase of the second detection signal being shifted by a ¼ period of the first detection signal relative to the first detection signal.Type: GrantFiled: March 30, 2006Date of Patent: June 5, 2007Assignee: Mitsumi Electric Co., Ltd.Inventors: Hideaki Sannomiya, Naosumi Waki, Junichiro Tanaka
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Publication number: 20070008190Abstract: A light receiving device is disclosed that is able to reduce jitter and to improve detection resolution. The light receiving device has plural light receiving elements each having a rectangular light receiving area. The light receiving areas are connected to each other at vertices on diagonals thereof, and sides of the light receiving areas of neighboring light receiving elements are adjacent to each other.Type: ApplicationFiled: March 28, 2006Publication date: January 11, 2007Inventors: Hideaki Sannomiya, Naosumi Waki, Yuko Kimura, Junichiro Tanaka
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Publication number: 20070001108Abstract: An encoder device includes a first array that includes first through fourth photodiodes adjacent to each other in an X direction, each having a length of X1; a second array that includes fifth through eighth photodiodes adjacent to each other in the X direction, each having a length of X1, and is adjacent to the first array in a Y direction but displaced by X1/2 in the X direction relative to the first array; a slit member that includes light transmitting sections and light shielding section arranged alternately, each having a length 2×X1, and is movable in the X direction; and a logic circuit that generates first and second detection signals from output signals of the first through fourth photodiodes and output signals of the fifth through eighth photodiodes, respectively, a phase of the second detection signal being shifted by a ¼ period of the first detection signal relative to the first detection signal.Type: ApplicationFiled: March 30, 2006Publication date: January 4, 2007Inventors: Hideaki Sannomiya, Naosumi Waki, Junichiro Tanaka
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Publication number: 20070001107Abstract: An encoder device includes first through fourth photodiodes each having a rhombus shape and a length of X1 in an X direction, the photodiodes being disposed adjacent to each other in the X direction such that a line passing through a pair of opposing vertices of the rhombus shape of each of the photodiodes is parallel to an X axis; a slit member that includes light transmitting sections and light shielding sections alternately arranged, and is movable in the X direction, each of the light transmitting and shielding sections having a length of 2×X1 in the X direction; and a logic circuit that generates first and second detection signals from output signals of the photodiodes that have received lights passing through the light transmitting sections, a phase of the second detection signal being shifted by a ¼ period of the first detection signal relative to the first detection signal.Type: ApplicationFiled: March 30, 2006Publication date: January 4, 2007Inventors: Hideaki Sannomiya, Naosumi Waki, Yuko Kimura, Junichiro Tanaka
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Patent number: 7009870Abstract: A semiconductor integrated circuit apparatus that is capable of reducing crosstalk without increasing the number of low impedance external terminals is realized by implementing first external terminals that are adapted to input/output high frequency signals of various channels, a second external terminal that has a higher impedance than the first external terminals and is implemented between two of the first external terminals, and a capacitor of which one end is connected to the second external terminal and the other end is arranged to have a predetermined electrical potential.Type: GrantFiled: February 23, 2004Date of Patent: March 7, 2006Assignee: Mitsumi Electric Co., Ltd.Inventor: Naosumi Waki
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Publication number: 20040257141Abstract: A semiconductor integrated circuit apparatus that is capable of reducing crosstalk without increasing the number of low impedance external terminals is realized by implementing first external terminals that are adapted to input/output high frequency signals of various channels, a second external terminal that has a higher impedance than the first external terminals and is implemented between two of the first external terminals, and a capacitor of which one end is connected to the second external terminal and the other end is arranged to have a predetermined electrical potential.Type: ApplicationFiled: February 23, 2004Publication date: December 23, 2004Inventor: Naosumi Waki