Patents by Inventor Takuma Yokoyama

Takuma Yokoyama 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).

  • Patent number: 12117340
    Abstract: To provide a light source apparatus for light measurement in which time wavelength uniqueness is not lost even in a case of high output, and to enable spectroscopic measurement with high accuracy and at high speed. Broadband pulsed light having a continuous spectrum over a wavelength width of at least 50 nm in a range of 900 to 1300 nm is emitted from a pulsed light source, and divided for each wavelength by a divider, and light having each wavelength is transmitted by each of stretch fibers and emitted from a coupler. The stretch fibers have different lengths such that an elapsed time and the wavelength in one pulse correspond to each other on a one-to-one basis at an emission end.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: October 15, 2024
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventors: Go Yamada, Takuma Yokoyama
  • Patent number: 12092520
    Abstract: Broadband pulsed light from a broadband pulsed light source is pulse-stretched such that an elapsed time and a wavelength in a pulse correspond to each other on a one-to-one basis, and is radiated to an object. The light transmitted through the object is received by a light receiver and converted into a spectrum by a calculator. The broadband pulsed light is divided according to a wavelength by dividing elements, and is pulse-stretched by two fibers having different dispersion characteristics or received by two light receivers having different characteristics.
    Type: Grant
    Filed: March 25, 2020
    Date of Patent: September 17, 2024
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventor: Takuma Yokoyama
  • Publication number: 20240110866
    Abstract: An illumination device irradiates a predetermined area with measurement light whose wavelength changes over time. A light reception device includes an optical sensor that detects diffuse transmission light of an object located in the predetermined area. The light reception device is structured such that the optical sensor receives a component of the diffuse transmission light through the object which propagates in a direction deviated from an optical axis of the measurement light.
    Type: Application
    Filed: March 15, 2022
    Publication date: April 4, 2024
    Applicant: USHIO DENKI KABUSHIKI KAISHA
    Inventors: Takuma YOKOYAMA, Katsuya WATANABE
  • Publication number: 20230333010
    Abstract: A light source apparatus generates wavelength scanning light. A pulsed light source generates pulsed light including a continuous spectrum. An optical divider spatially divides the broadband pulsed light L into a plurality of n (n?2) beams according to wavelengths. A plurality of n fibers give different delays to the n beams. The coupler multiplexes n beams output from the n fibers. In the light source apparatus, at least a part from an incident end of the optical divider to emission ends of the n fibers has a continuous waveguide structure. A light monitoring device extracts and measures part of light propagating through the continuous waveguide structure.
    Type: Application
    Filed: April 13, 2023
    Publication date: October 19, 2023
    Applicant: USHIO DENKI KABUSHIKI KAISHA
    Inventors: Takuma YOKOYAMA, Aya OTA
  • Patent number: 11385173
    Abstract: [Object] An optimal structure for spectroscopically analyzing a solid-phase or liquid-phase sample in a wavelength range of 1100 to 1200 nm by using supercontinuum light is provided. [Solution] Supercontinuum light generated by producing nonlinear effects in light from a pulse laser source 1 by a nonlinear element 2 and having a wavelength range including 1100 nm or greater and 1200 nm or less is subjected to pulse stretching by a pulse stretching element 3, and a solid-phase or a liquid-phase sample S is irradiated with the supercontinuum light. In the supercontinuum light, elapsed time and wavelength within one pulse are in a one-to-one correspondence, and computation means 5 computes a spectrum based on a change over time in an output from a light receiver 4 that has received light that has passed through the sample S.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: July 12, 2022
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventors: Go Yamada, Takuma Yokoyama
  • Publication number: 20220187126
    Abstract: Broadband pulsed light from a broadband pulsed light source is pulse-stretched such that an elapsed time and a wavelength in a pulse correspond to each other on a one-to-one basis, and is radiated to an object. The light transmitted through the object is received by a light receiver and converted into a spectrum by a calculator. The broadband pulsed light is divided according to a wavelength by dividing elements, and is pulse-stretched by two fibers having different dispersion characteristics or received by two light receivers having different characteristics.
    Type: Application
    Filed: March 25, 2020
    Publication date: June 16, 2022
    Applicant: Ushio Denki Kabushiki Kaisha
    Inventor: Takuma YOKOYAMA
  • Publication number: 20220170791
    Abstract: To provide a light source apparatus for light measurement in which time wavelength uniqueness is not lost even in a case of high output, and to enable spectroscopic measurement with high accuracy and at high speed. Broadband pulsed light having a continuous spectrum over a wavelength width of at least 50 nm in a range of 900 to 1300 nm is emitted from a pulsed light source, and divided for each wavelength by a divider, and light having each wavelength is transmitted by each of stretch fibers and emitted from a coupler. The stretch fibers have different lengths such that an elapsed time and the wavelength in one pulse correspond to each other on a one-to-one basis at an emission end.
    Type: Application
    Filed: March 25, 2020
    Publication date: June 2, 2022
    Applicant: Ushio Denki Kabushiki Kaisha
    Inventors: Go YAMADA, Takuma YOKOYAMA
  • Patent number: 11268855
    Abstract: [Object] There is provided a wideband extended pulsed light source that maintains uniqueness of an elapsed time with respect to a wavelength and does not collapse the uniqueness of an elapsed time with respect to a wavelength even when an output is increased. [Solution] Light L1 from a pulsed laser source 11 is converted into supercontinuum light by a nonlinear element 12, is output as wideband pulsed light L2, and is caused to enter a pulse extension element 2. The pulse extension element 2 that is a multi-core fiber performs pulse extension in each of cores 211 and outputs wideband extended pulsed light L3. In the wideband extended pulsed light L3, an elapsed time and a wavelength in a pulse correspond to each other on one-to-one basis, and the wideband extended pulsed light L3 is used as light for spectrometry.
    Type: Grant
    Filed: September 12, 2019
    Date of Patent: March 8, 2022
    Assignee: Ushio Denki Kabushiki Kaisha
    Inventors: Toshikazu Nagashima, Takuma Yokoyama
  • Publication number: 20210389237
    Abstract: [Object] An optimal structure for spectroscopically analyzing a solid-phase or liquid-phase sample in a wavelength range of 1100 to 1200 nm by using supercontinuum light is provided. [Solution] Supercontinuum light generated by producing nonlinear effects in light from a pulse laser source 1 by a nonlinear element 2 and having a wavelength range including 1100 nm or greater and 1200 nm or less is subjected to pulse stretching by a pulse stretching element 3, and a solid-phase or a liquid-phase sample S is irradiated with the supercontinuum light. In the supercontinuum light, elapsed time and wavelength within one pulse are in a one-to-one correspondence, and computation means 5 computes a spectrum based on a change over time in an output from a light receiver 4 that has received light that has passed through the sample S.
    Type: Application
    Filed: September 12, 2019
    Publication date: December 16, 2021
    Applicant: Ushio Denki Kabushiki Kaisha
    Inventors: Go Yamada, Takuma Yokoyama
  • Publication number: 20210356323
    Abstract: [Object] There is provided a wideband extended pulsed light source that maintains uniqueness of an elapsed time with respect to a wavelength and does not collapse the uniqueness of an elapsed time with respect to a wavelength even when an output is increased. [Solution] Light L1 from a pulsed laser source 11 is converted into supercontinuum light by a nonlinear element 12, is output as wideband pulsed light L2, and is caused to enter a pulse extension element 2. The pulse extension element 2 that is a multi-core fiber performs pulse extension in each of cores 211 and outputs wideband extended pulsed light L3. In the wideband extended pulsed light L3, an elapsed time and a wavelength in a pulse correspond to each other on one-to-one basis, and the wideband extended pulsed light L3 is used as light for spectrometry.
    Type: Application
    Filed: September 12, 2019
    Publication date: November 18, 2021
    Applicant: Ushio Denki Kabushiki Kaisha
    Inventors: Toshikazu Nagashima, Takuma Yokoyama
  • Patent number: 9946524
    Abstract: A method of compiling a source code described by a first programming language, the method being executed by a computer and includes: specifying a function described by a second programming language different from the first programming language from the source code, the function being allowed to use one or more arguments; and first creating an instruction to store given data that causes occurrence of an error when a register is accessed due to execution of the function in an area in the register for an argument that is not set for the function in the source code among the one or more arguments.
    Type: Grant
    Filed: January 21, 2016
    Date of Patent: April 17, 2018
    Assignee: FUJITSU LIMITED
    Inventor: Takuma Yokoyama
  • Patent number: 9826617
    Abstract: An extreme ultraviolet light source device that can stably and efficiently provide EUV emission. The EUV light source device includes a first laser source that irradiates a high-temperature plasma raw material with a laser beam, and a second laser source that, after the high-temperature plasma raw material is irradiated with the laser beam and before effective extreme ultraviolet light is emitted, irradiates the raw material in that region which is irradiated with the laser beam, with a second laser beam. The EUV light source device also includes a return light blocking unit that prevents return light of the laser beam, which is emitted from the first laser source, from reaching a light emission opening of the second laser source.
    Type: Grant
    Filed: May 22, 2015
    Date of Patent: November 21, 2017
    Assignee: USHIO DENKI KABUSHIKI KAISHA
    Inventor: Takuma Yokoyama
  • Publication number: 20170094766
    Abstract: An extreme ultraviolet light source device that can stably and efficiently provide EUV emission. The EUV light source device includes a first laser source that irradiates a high-temperature plasma raw material with a laser beam, and a second laser source that, after the high-temperature plasma raw material is irradiated with the laser beam and before effective extreme ultraviolet light is emitted, irradiates the raw material in that region which is irradiated with the laser beam, with a second laser beam. The EUV light source device also includes a return light blocking unit that prevents return light of the laser beam, which is emitted from the first laser source, from reaching a light emission opening of the second laser source.
    Type: Application
    Filed: May 22, 2015
    Publication date: March 30, 2017
    Applicant: USHIO DENKI KABUSHIKI KAISHA
    Inventor: Takuma YOKOYAMA
  • Publication number: 20160274877
    Abstract: A method of compiling a source code described by a first programming language, the method being executed by a computer and includes: specifying a function described by a second programming language different from the first programming language from the source code, the function being allowed to use one or more arguments; and first creating an instruction to store given data that causes occurrence of an error when a register is accessed due to execution of the function in an area in the register for an argument that is not set for the function in the source code among the one or more arguments.
    Type: Application
    Filed: January 21, 2016
    Publication date: September 22, 2016
    Applicant: FUJITSU LIMITED
    Inventor: Takuma Yokoyama
  • Publication number: 20090084992
    Abstract: To achieve pulse-stretched EUV radiation without putting a large heat load on electrodes or requiring sophisticated control, a pulsed power is supplied between a first electrode and a second electrode provided inside a chamber to form a narrow discharge channel therebetween. A laser beam from a laser source irradiates high temperature plasma material to form low temperature plasma gas having an ion density of approximately 1017 to 1020 cm?3 which is supplied to a narrow discharge channel formed between the electrodes. Electric discharge acts on the low temperature plasma gas to raise the electron temperature, resulting in high temperature plasma. As a result, EUV radiation is produced. Since the low temperature plasma gas is continuously supplied to the discharge channel, the pinch effect or confining effect of its self-magnetic field is repeated, resulting in the continuation of EUV radiation.
    Type: Application
    Filed: October 1, 2008
    Publication date: April 2, 2009
    Applicants: USHIO DENKI KABUSHIKI KAISHA, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Tomonao HOSOKAI, Kazuhiko HORIOKA, Kyohei SEKI, Takuma YOKOYAMA
  • Publication number: 20080237501
    Abstract: High temperature plasma raw material (21) is gasified by irradiation with a first energy beam (23). When the gasified raw material reaches the discharge region, pulsed power is applied between the electrodes (11, 12) and a second energy beam (24) irradiates. In this manner, the plasma is heated and excited and an EUV emission occurs. The emitted EUV emission is collected and extracted by EUV collector optics. Because of irradiation by the first and second energy beams (23, 24), a special distribution of high temperature plasma raw material density can be set to a specified distribution and demarcation of the position of the discharge channel can be set. Moreover, it is possible to lengthen pulses of extreme ultraviolet emission by supplying raw material gas of which the ion density in the discharge path is nearly the same as the ion density under EUV radiation emission conditions.
    Type: Application
    Filed: March 26, 2008
    Publication date: October 2, 2008
    Applicants: USHIO DENKI KABUSHIKI KAISHA, TOKYO INSTITUTE OF TECHNOLOGY
    Inventors: Tomonao Hosokai, Kazuhiko Horioka, Hiroshi Mizokoshi, Takuma Yokoyama, Kyohei Seki