Patents by Inventor Takehiko Suyama
Takehiko Suyama 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: 11888536Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a power storage and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The power storage stores the electric power. The controller performs a process of lowering an output level of the feed light in response to a value related to an electric power amount of the electric power stored in the power storage being equal to or higher than a predetermined threshold value, and performs a process of raising the output level in response to the value being lower than the predetermined threshold value.Type: GrantFiled: May 22, 2020Date of Patent: January 30, 2024Assignee: KYOCERA CORPORATIONInventor: Takehiko Suyama
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Patent number: 11784655Abstract: An analog-to-digital converter (1) includes an S/H circuit (10) that samples and holds an analog input signal in synchronization with a first sampling clock signal (CLK1), a filter circuit (20) that smooths an output signal of the S/H circuit (10), and an ADC circuit (30) that samples an output signal of the filter circuit (20) in synchronization with a second sampling clock signal (CLK2) different from the first sampling clock signal (CLK1), and outputs a digital signal corresponding to an amplitude of the output signal that is sampled.Type: GrantFiled: June 24, 2021Date of Patent: October 10, 2023Assignee: KYOCERA CorporationInventors: Takehiko Suyama, Takahiro Kobayashi
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Publication number: 20220393773Abstract: To increase optical power feed efficiency, an optical power feeding system includes power sourcing equipment including a semiconductor laser that lases using electric power and outputs power feed light in a pulsed manner, and a powered device including a photoelectric conversion element that converts the power feed light into electric power. The power sourcing equipment has a clock signal generation unit that generates a clock signal from a pulsed output of the power feed light , and the powered device has a clock signal extraction unit that extracts the clock signal from the power feed light. Accordingly, the amount of electric power to be supplied is controlled more appropriately, it is not necessary to separately transmit a clock signal, and optical power feed efficiency is increased.Type: ApplicationFiled: September 30, 2020Publication date: December 8, 2022Inventor: Takehiko SUYAMA
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Patent number: 11509401Abstract: An optical connector of a power over fiber system includes a shutter. The shutter opens in conjunction with a connection operation to enable the connection and closes in conjunction with a disconnection operation to block feed light from exiting. A light receiving surface of the shutter is made of a wavelength conversion material. The light receiving surface receives the feed light when the shutter is closed. The optical connector is disposed at a feed-light output end in the power over fiber system.Type: GrantFiled: May 29, 2020Date of Patent: November 22, 2022Assignee: KYOCERA CORPORATIONInventor: Takehiko Suyama
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Publication number: 20220360343Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable, a power storage and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The power storage stores the electric power. The controller performs a process of lowering an output level of the feed light in response to a value related to an electric power amount of the electric power stored in the power storage being equal to or higher than a predetermined threshold value, and performs a process of raising the output level in response to the value being lower than the predetermined threshold value.Type: ApplicationFiled: May 22, 2020Publication date: November 10, 2022Inventor: Takehiko SUYAMA
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Publication number: 20220311282Abstract: An optical power supply system includes a power sourcing equipment, a powered device and a control device. The power sourcing equipment includes a semiconductor laser that oscillates with electric power and performs pulsed output of feed light. The powered device includes a photoelectric conversion element that converts the feed light into electric power. The control device adjusts a supply amount of the feed light to be supplied from the semiconductor laser by a pulse width of the feed light according to a consumption of the electric power obtained by the conversion by the powered device.Type: ApplicationFiled: June 10, 2020Publication date: September 29, 2022Inventor: Takehiko SUYAMA
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Patent number: 11362740Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable and a controller. The power sourcing equipment includes semiconductor lasers. The semiconductor lasers output feed light of different wavelengths by oscillating with electric power. The powered device includes photoelectric conversion elements. The photoelectric conversion elements have different photoelectric conversion efficiencies and convert the feed light output from the power sourcing equipment into electric power with their respective photoelectric conversion efficiencies. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The controller performs a process of selecting and activating one of the semiconductor lasers and a process of selecting and activating one of the photoelectric conversion elements in order that the power over fiber system perform predetermined power supply.Type: GrantFiled: May 21, 2020Date of Patent: June 14, 2022Assignee: KYOCERA CORPORATIONInventor: Takehiko Suyama
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Publication number: 20220094449Abstract: An optical connector of a power over fiber system includes a shutter. The shutter opens in conjunction with a connection operation to enable the connection and closes in conjunction with a disconnection operation to block feed light from exiting. A light receiving surface of the shutter is made of a wavelength conversion material. The light receiving surface receives the feed light when the shutter is closed. The optical connector is disposed at a feed-light output end in the power over fiber system.Type: ApplicationFiled: May 29, 2020Publication date: March 24, 2022Inventor: Takehiko SUYAMA
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Publication number: 20210359759Abstract: A power over fiber system includes a power sourcing equipment, a powered device, an optical fiber cable and a controller. The power sourcing equipment includes semiconductor lasers. The semiconductor lasers output feed light of different wavelengths by oscillating with electric power. The powered device includes photoelectric conversion elements. The photoelectric conversion elements have different photoelectric conversion efficiencies and convert the feed light output from the power sourcing equipment into electric power with their respective photoelectric conversion efficiencies. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The controller performs a process of selecting and activating one of the semiconductor lasers and a process of selecting and activating one of the photoelectric conversion elements in order that the power over fiber system perform predetermined power supply.Type: ApplicationFiled: May 21, 2020Publication date: November 18, 2021Applicant: KYOCERA CorporationInventor: Takehiko SUYAMA
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Patent number: 11165498Abstract: A power over fiber system includes: a power sourcing equipment, a powered device, an optical fiber cable, a temperature sensor and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light from the power sourcing equipment into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The temperature sensor detects a temperature of the photoelectric conversion element. The controller performs a process of lowering an output level of the feed light in response to the temperature detected by the temperature sensor being equal to or higher than a predetermined threshold value, and performs a process of raising the output level of the feed light in response to the temperature being lower than the predetermined threshold value.Type: GrantFiled: May 21, 2020Date of Patent: November 2, 2021Assignee: KYOCERA CORPORATIONInventor: Takehiko Suyama
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Publication number: 20210320670Abstract: An analog-to-digital converter (1) includes an S/H circuit (10) that samples and holds an analog input signal in synchronization with a first sampling clock signal (CLK1), a filter circuit (20) that smooths an output signal of the S/H circuit (10), and an ADC circuit (30) that samples an output signal of the filter circuit (20) in synchronization with a second sampling clock signal (CLK2) different from the first sampling clock signal (CLK1), and outputs a digital signal corresponding to an amplitude of the output signal that is sampled.Type: ApplicationFiled: June 24, 2021Publication date: October 14, 2021Applicant: KYOCERA CorporationInventors: Takehiko SUYAMA, Takahiro KOBAYASHI
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Publication number: 20210184769Abstract: A power over fiber system includes: a power sourcing equipment, a powered device, an optical fiber cable, a temperature sensor and a controller. The power sourcing equipment includes a semiconductor laser that oscillates with electric power, thereby outputting feed light. The powered device includes a photoelectric conversion element that converts the feed light from the power sourcing equipment into electric power. The optical fiber cable transmits the feed light from the power sourcing equipment to the powered device. The temperature sensor detects a temperature of the photoelectric conversion element. The controller performs a process of lowering an output level of the feed light in response to the temperature detected by the temperature sensor being equal to or higher than a predetermined threshold value, and performs a process of raising the output level of the feed light in response to the temperature being lower than the predetermined threshold value.Type: ApplicationFiled: May 21, 2020Publication date: June 17, 2021Inventor: Takehiko SUYAMA
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Patent number: 6618954Abstract: A longitudinal profile measuring apparatus including a relative distance meter located on a frame supported by more than two wheels in a row in a direction of a measuring line for measuring relative distance to a target surface, a moving distance meter for measuring moving distance of movement along the measuring line on the target surface, and a data processing unit for finding spatial data, which shows a rough profile of the target surface, along the measuring line from the relative distance measured by the relative distance meter.Type: GrantFiled: May 29, 2001Date of Patent: September 16, 2003Assignee: Tokimec Construction Systems Inc.Inventors: Masakuni Kumazawa, Mutsumi Takahashi, Takehiko Suyama, Tatsuyuki Ochi
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Publication number: 20020007562Abstract: A longitudinal profile measuring apparatus including a relative distance meter located on a frame supported by more than two wheels in a row in a direction of a measuring line for measuring relative distance to a target surface, a moving distance meter for measuring moving distance of movement along the measuring line on the target surface, and a data processing unit for finding spatial data, which shows a rough profile of the target surface, along the measuring line from the relative distance measured by the relative distance meter.Type: ApplicationFiled: May 29, 2001Publication date: January 24, 2002Inventors: Masakuni Kumazawa, Mutsumi Takahashi, Takehiko Suyama, Tatsuyuki Ochi
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Patent number: 4937795Abstract: An access alarming method and apparatus for activating an alarm in the event of the access of a working vehicle, such as a road roller, to an object, such as a worker, in the same working area as the vehicle. An ultrasonic wave transmitted by a transmitter on the object is received by a receiver on the vehicle. The received signal is processed and used to determine the relative position of the vehicle with respect to the object. An alarm is activated, and/or the vehicle is braked when it is judged that the object is within a hazard area determined in relation to the position and course of the vehicle.Type: GrantFiled: July 5, 1988Date of Patent: June 26, 1990Assignee: Tokyo Keiki Co., Ltd.Inventors: Ryohei Motegi, Yoichi Hirokawa, Yukio Yoshida, Junichi Furuki, Tetsuya Ishii, Isao Takiguchi, Hiroshi Kono, Takehiko Suyama, Tomohiro Gocho, Satohiko Tanaka, Narimasa Yamabe, Yoshimitsu Hashimoto