Patents by Inventor Joji Yamaguchi
Joji Yamaguchi 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: 11721948Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.Type: GrantFiled: July 20, 2021Date of Patent: August 8, 2023Assignee: Nippon Telegraph and Telephone CorporationInventors: Masahiro Ueno, Meishin Chin, Shoko Tatsumi, Takashi Sakamoto, Yuzo Sasaki, Seiji Toyoda, Yuichi Akage, Joji Yamaguchi, Tadashi Sakamoto
-
Publication number: 20220369595Abstract: A sound collecting apparatus according to an embodiment of the present disclosure includes a sound collecting part that detects sound in a body of an animal, a sound absorbing member that is provided on the sound collecting part, and a contact member that is provided on the sound absorbing member such that the contact member contacts a body surface of the animal, wherein the sound collecting part includes a housing, an opening causing the inside of the housing to be in communication with the outside of the housing on a surface of the housing proximate to the sound absorbing member, and a sound collecting element provided inside the housing for detecting the sound, wherein the sound absorbing member covers the opening of the housing, and protrudes toward the inside of the housing.Type: ApplicationFiled: May 26, 2022Publication date: November 24, 2022Applicant: Langualess inc.Inventor: Joji YAMAGUCHI
-
Publication number: 20210408755Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.Type: ApplicationFiled: July 20, 2021Publication date: December 30, 2021Inventors: Masahiro UENO, Meishin CHIN, Shoko TATSUMI, Takashi SAKAMOTO, Yuzo SASAKI, Seiji TOYODA, Yuichi AKAGE, Joji YAMAGUCHI, Tadashi SAKAMOTO
-
Patent number: 11165219Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.Type: GrantFiled: December 4, 2017Date of Patent: November 2, 2021Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Masahiro Ueno, Meishin Chin, Shoko Tatsumi, Takashi Sakamoto, Yuzo Sasaki, Seiji Toyoda, Yuichi Akage, Joji Yamaguchi, Tadashi Sakamoto
-
Patent number: 10667495Abstract: An animal emotion estimation device includes: a sound collector configured by an elastic member having a recess, a sound concentrating microphone provided on the bottom portion of the recess, and an impact absorber covering the entire of the elastic member and the sound concentrating microphone; a harness to mount the sound collector on an animal; a converter that filters and converts the sound collected through the sound collector into a heart rate signal; an estimation portion that estimates the emotion of the animal based on the heart rate signal; and an output unit that supplies information showing the estimation estimated by the estimation portion.Type: GrantFiled: June 13, 2016Date of Patent: June 2, 2020Assignee: Langualess Inc.Inventor: Joji Yamaguchi
-
Publication number: 20200076154Abstract: A swept light source of the present invention keeps a coherence length of an output beam long over an entire sweep wavelength range. A gain of a gain medium is changed with time in response to a wavelength sweep and the coherence length is kept maximum. The gain of the gain medium is kept close to a lasing threshold and an unsaturated gain range of the gain medium is narrowed over the entire sweep wavelength range. An SOA current waveform data acquiring method of driving while keeping the coherence length long, a novel coherence length measuring method, and an optical deflector suitable for the swept light source are also disclosed.Type: ApplicationFiled: December 4, 2017Publication date: March 5, 2020Inventors: Masahiro Ueo, Meishin Chin, Shoko Tatsumi, Takashi Sakamoto, Yuzo Sasaki, Seiji Toyoda, Yuichi Akage, Joji Yamaguchi, Tadashi Sakamoto
-
Patent number: 10205296Abstract: Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage is superimposed is output from a control voltage source of the light deflector to an electrode pair of an electro-optic crystal, light is radiated from a light emitter to the electro-optic crystal, and incident light from the gain medium incident along an optical axis perpendicular to a direction of an electric field formed by the control voltage is deflected in a direction parallel to the electric field, so that wavelength sweeping is performed.Type: GrantFiled: June 7, 2017Date of Patent: February 12, 2019Assignees: NIPPON TELEGRAPH AND TELEPHONE CORPORATION, HAMAMATSU PHOTONICS K.K., NTT Advanced Technology CorporationInventors: Seiji Toyoda, Yuzo Sasaki, Takashi Sakamoto, Joji Yamaguchi, Tadashi Sakamoto, Koei Yamamoto, Masatoshi Fujimoto, Mahiro Yamada, Shogo Yagi, Yukihiko Ushiyama, Eiichi Sugai, Koji Yoneyama, Kazuo Fujiura
-
Publication number: 20180177158Abstract: An animal emotion estimation device includes: a sound collector configured by an elastic member having a recess, a sound concentrating microphone provided on the bottom portion of the recess, and an impact absorber covering the entire of the elastic member and the sound concentrating microphone; a harness to mount the sound collector on an animal; a converter that filters and converts the sound collected through the sound collector into a heart rate signal; an estimation portion that estimates the emotion of the animal based on the heart rate signal; and an output unit that supplies information showing the estimation estimated by the estimation portion.Type: ApplicationFiled: June 13, 2016Publication date: June 28, 2018Inventor: Joji Yamaguchi
-
Patent number: 10006831Abstract: An end face observation device (101) of this invention includes a first lens (12) including a missing portion (1200) extending through in an optical axis direction, a light source (14) configured to generate light that irradiates an end face (200A) of an observation target via the first lens, and an image capturing element (15) configured to receive an image of the end face of the observation target via the first lens. This can implement an end face observation device that integrates a structure configured to operate the end face of the observation target with an observation device configured to observe the end face by inserting the structure configured to operate the end face of the observation target into the missing portion of the first lens.Type: GrantFiled: December 16, 2014Date of Patent: June 26, 2018Assignee: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Yuichi Higuchi, Koichi Hadama, Joji Yamaguchi, Toru Miura, Etsu Hashimoto
-
Publication number: 20170358899Abstract: Provided is a swept light source including one end surface coupled to a wavelength filter constituted of a diffraction grating and an end mirror via a light deflector and another end surface including a gain medium facing an output coupling mirror and which configures a laser cavity between the end mirror and the output coupling mirror, wherein a drive voltage having an AC voltage on which a DC bias voltage is superimposed is output from a control voltage source of the light deflector to an electrode pair of an electro-optic crystal, light is radiated from a light emitter to the electro-optic crystal, and incident light from the gain medium incident along an optical axis perpendicular to a direction of an electric field formed by the control voltage is deflected in a direction parallel to the electric field, so that wavelength sweeping is performed.Type: ApplicationFiled: June 7, 2017Publication date: December 14, 2017Applicants: Nippon Telegraph and Telephone Corporation, Hamamatsu Photonics K.K., NTT Advanced Technology CorporationInventors: Seiji TOYODA, Yuzo Sasaki, Takashi Sakamoto, Joji Yamaguchi, Tadashi Sakamoto, Koei Yamamoto, Masatoshi Fujimoto, Mahiro Yamada, Shogo Yagi, Yukihiko Ushiyama, Eiichi Sugai, Koji Yoneyama, Kazuo Fujiura
-
Patent number: 9753231Abstract: An optical connector cleaning tool includes a cylindrical connecting portion to which an optical connector is connected, a cleaning unit configured to guide a cleaning thread to a coupling end face of an optical connector plug, and an optical unit having an optical path reaching the optical connector plug. The optical unit includes a lens arranged in a position facing the coupling end face to form one end portion of an optical system, and having a missing portion extending in an optical-axis direction, and an image sensor positioned at the other end of the optical system. The cleaning unit includes a rod-like cleaning tip having a thread passage through which the cleaning thread passes. The cleaning tip is inserted into a hollow portion of the lens having the missing portion extending in the optical-axis direction, such that the cleaning tip is movable in a longitudinal direction thereof.Type: GrantFiled: March 9, 2015Date of Patent: September 5, 2017Assignees: NTT ADVANCED TECHNOLOGY CORPORATION, NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Toru Miura, Masayuki Murakami, Masaru Kobayashi, Yuichi Higuchi, Joji Yamaguchi
-
Patent number: 9588300Abstract: An optical input/output device includes a phase modulator element and an optical element. The phase modulator element includes a plurality of pixels arranged in a matrix and is configured to change an optical phase of signal light by applying a driving signal corresponding to a phase pattern. The optical element is configured to convert a direction of exit of the signal light so as to irradiate each pixel with the signal light from the input port. A pattern generator unit includes superimposing means for superimposing a periodic phase pattern having a predetermined period in at least one direction in a plane of the phase modulator element, and means for controlling an amplitude of the periodic phase pattern. The signal light is diffracted to a position according to the period of the superimposed periodic phase pattern, so that light intensity of the signal light is dispersed.Type: GrantFiled: December 6, 2013Date of Patent: March 7, 2017Assignee: Nippon Telegraph and Telephone CorporationInventors: Mitsumasa Nakajima, Keita Yamaguchi, Joji Yamaguchi, Yuzo Ishii, Koichi Hadama, Naru Nemoto, Etsu Hashimoto, Kazunori Seno, Kenya Suzuki, Yoshito Jin
-
Publication number: 20160313211Abstract: An end face observation device (101) of this invention includes a first lens (12) including a missing portion (1200) extending through in an optical axis direction, a light source (14) configured to generate light that irradiates an end face (200A) of an observation target via the first lens, and an image capturing element (15) configured to receive an image of the end face of the observation target via the first lens. This can implement an end face observation device that integrates a structure configured to operate the end face of the observation target with an observation device configured to observe the end face by inserting the structure configured to operate the end face of the observation target into the missing portion of the first lens.Type: ApplicationFiled: December 16, 2014Publication date: October 27, 2016Inventors: Yuichi Higuchi, Koichi Hadama, Joji Yamaguchi, Toru Miura, Etsu Hashimoto
-
Publication number: 20150316725Abstract: An optical input/output device includes a phase modulator element and an optical element. The phase modulator element includes a plurality of pixels arranged in a matrix and is configured to change an optical phase of signal light by applying a driving signal corresponding to a phase pattern. The optical element is configured to convert a direction of exit of the signal light so as to irradiate each pixel with the signal light from the input port. A pattern generator unit includes superimposing means for superimposing a periodic phase pattern having a predetermined period in at least one direction in a plane of the phase modulator element, and means for controlling an amplitude of the periodic phase pattern. The signal light is diffracted to a position according to the period of the superimposed periodic phase pattern, so that light intensity of the signal light is dispersed.Type: ApplicationFiled: December 6, 2013Publication date: November 5, 2015Applicant: NIPPON TELEGRAPH AND TELEPHONE CORPORATIONInventors: Mitsumasa Nakajima, Keita Yamaguchi, Joji Yamaguchi, Yuzo Ishii, Koichi Hadama, Naru Nemoto, Etsu Hashimoto, Kazunori Seno, Kenya Suzuki, Yoshito Jin
-
Publication number: 20150253516Abstract: An optical connector cleaning tool includes a cylindrical connecting portion to which an optical connector is connected, a cleaning unit configured to guide a cleaning thread to a coupling end face of an optical connector plug, and an optical unit having an optical path reaching the optical connector plug. The optical unit includes a lens arranged in a position facing the coupling end face to form one end portion of an optical system, and having a missing portion extending in an optical-axis direction, and an image sensor positioned at the other end of the optical system. The cleaning unit includes a rod-like cleaning tip having a thread passage through which the cleaning thread passes. The cleaning tip is inserted into a hollow portion of the lens having the missing portion extending in the optical-axis direction, such that the cleaning tip is movable in a longitudinal direction thereof.Type: ApplicationFiled: March 9, 2015Publication date: September 10, 2015Inventors: Toru Miura, Masayuki Murakami, Masaru Kobayashi, Yuichi Higuchi, Joji Yamaguchi
-
Patent number: 7246579Abstract: An actuator for a valve lift controller comprises a case forming a first and second spaces therein. The first space is supplied with lubricating fluid. The actuator further comprises a feed screw mechanism including a cylindrical spindle and a screw, and converts a rotational movement of the spindle to a linear movement of the screw. The spindle includes a first end portion open to the first space and a second end portion closed to the second space therein. The screw straddles borders between an interior of the spindle, the first space, and an external space. The actuator includes a motor unit which is located in the second space and rotates the spindle. The actuator further includes a sealing member sealing a gap between the case and the spindle to separate the first and second spaces.Type: GrantFiled: February 1, 2006Date of Patent: July 24, 2007Assignee: DENSO CorporationInventors: Kiyoshi Kimura, Shigeru Yoshiyama, Taku Itoh, Hideo Inaba, Joji Yamaguchi, Akihiko Kameshima, Toshiki Fujiyoshi
-
Patent number: 7234425Abstract: An actuator for a valve lift controller linearly driving a control shaft of a changing mechanism comprises a feed screw mechanism including a screwed shaft linearly moving along with the control shaft, and a rotation spindle rotating coaxially with the screwed shaft. The feed screw mechanism converts a rotational movement of the rotation spindle into a linear movement of the screwed shaft. Moreover, the actuator comprises a unit attached to the rotation spindle, an electric power distributor located at an opposite side of the screw mechanism relative to the changing mechanism, and an stopper member restricting a movement of the unit in the axial direction from an electric power distributor to the unit.Type: GrantFiled: February 1, 2006Date of Patent: June 26, 2007Assignee: Denso CorporationInventors: Kiyoshi Kimura, Shigeru Yoshiyama, Taku Itoh, Hideo Inaba, Joji Yamaguchi, Akihiko Kameshima, Toshiki Fujiyoshi
-
Publication number: 20060169233Abstract: An actuator for a valve lift controller linearly driving a control shaft of a changing mechanism comprises a feed screw mechanism including a screwed shaft linearly moving along with the control shaft, and a rotation spindle rotating coaxially with the screwed shaft. The feed screw mechanism converts a rotational movement of the rotation spindle into a linear movement of the screwed shaft. Moreover, the actuator comprises a unit attached to the rotation spindle, an electric power distributor located at an opposite side of the screw mechanism relative to the changing mechanism, and an stopper member restricting a movement of the unit in the axial direction from an electric power distributor to the unit.Type: ApplicationFiled: February 1, 2006Publication date: August 3, 2006Applicant: DENSO CORPORATIONInventors: Kiyoshi Kimura, Shigeru Yoshiyama, Taku Itoh, Hideo Inaba, Joji Yamaguchi, Akihiko Kameshima, Toshiki Fujiyoshi
-
Publication number: 20060169234Abstract: An actuator for a valve lift controller comprises a case forming a first and second spaces therein. The first space is supplied with lubricating fluid. The actuator further comprises a feed screw mechanism including a cylindrical spindle and a screw, and converts a rotational movement of the spindle to a linear movement of the screw. The spindle includes a first end portion open to the first space and a second end portion closed to the second space therein. The screw straddles borders between an interior of the spindle, the first space, and an external space. The actuator includes a motor unit which is located in the second space and rotates the spindle. The actuator further includes a sealing member sealing a gap between the case and the spindle to separate the first and second spaces.Type: ApplicationFiled: February 1, 2006Publication date: August 3, 2006Applicant: Denso CorporationInventors: Kiyoshi Kimura, Shigeru Yoshiyama, Taku Itoh, Hideo Inaba, Joji Yamaguchi, Akihiko Kameshima, Toshiki Fujiyoshi
-
Patent number: 5784515Abstract: An optical fiber cross connection apparatus is provided for connecting and disconnecting input optical fibers to desired output optical fibers, each of the input optical fibers being equipped with a plug on a tip thereof.Type: GrantFiled: January 22, 1996Date of Patent: July 21, 1998Assignee: Nippon Telegraph and Telephone CorporationInventors: Naoyuki Tamaru, Yasuhide Nishida, Tsuneo Kanai, Kazumasa Kaneko, Joji Yamaguchi, Tetsufumi Shoji