Patents by Inventor Tadashi Ichikawa
Tadashi Ichikawa 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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Publication number: 20200256995Abstract: A laser radar device includes: a light source; a projection light scanner that scans one part of light split off from emission light of the light source, and that generates transmission light for radiating onto a target object; an image forming section that forms plural respective reception lights of the transmission light reflected by respective locations of the target object into an image on a single flat plane as plural image-formation points; an optical receiver that is disposed at the plural image-formation points, and that includes plural unit optical reception sections for mixing each of the plural reception lights together with a reference light and performing optical heterodyne detection; and a reference light scanner that scans or distributes another light split off from the emission light from the light source, and that generates the reference light for radiating onto each of plural of the unit optical reception sections.Type: ApplicationFiled: November 18, 2015Publication date: August 13, 2020Inventors: Daisuke INOUE, Tadashi ICHIKAWA, Tatsuya YAMASHITA, Akari NAKAO, Kazuo HASEGAWA
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Patent number: 10739457Abstract: A laser radar device includes: a light source; a projection light scanner that scans one part of light split off from emission light of the light source, and that generates transmission light for radiating onto a target object; an image forming section that forms plural respective reception lights of the transmission light reflected by respective locations of the target object into an image on a single flat plane as plural image-formation points; an optical receiver that is disposed at the plural image-formation points, and that includes plural unit optical reception sections for mixing each of the plural reception lights together with a reference light and performing optical heterodyne detection; and a reference light scanner that scans or distributes another light split off from the emission light from the light source, and that generates the reference light for radiating onto each of plural of the unit optical reception sections.Type: GrantFiled: November 18, 2015Date of Patent: August 11, 2020Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke Inoue, Tadashi Ichikawa, Tatsuya Yamashita, Akari Nakao, Kazuo Hasegawa
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Patent number: 10209603Abstract: A switching optical antenna that includes: a waveguide including a light input end and a light output end; a ring waveguide coupled with the waveguide through a first directional coupler; a diffraction grating that is disposed within the ring waveguide and that is coupled with the ring waveguide through a second directional coupler; and a refractive index adjusting section that changes a refractive index of at least a portion of the ring waveguide.Type: GrantFiled: September 14, 2017Date of Patent: February 19, 2019Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke Inoue, Hiroyuki Matsubara, Tadashi Ichikawa
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Publication number: 20180333807Abstract: A laser processing device includes plural laser sources and a focusing section that focuses respective light beams of the plural laser sources to form plural focus points on a workpiece, and that focuses such that respective portions of at least some of the plural focus points are overlapping.Type: ApplicationFiled: March 17, 2017Publication date: November 22, 2018Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Kazuo HASEGAWA, Satoru KATO, Tadashi ICHIKAWA, Masatoshi YONEMURA
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Patent number: 9939577Abstract: A diffraction structure includes a supporting layer, a high refractive index layer, and a low refractive index layer. The high refractive index layer has a first refractive index, is formed above the supporting layer, configures a waveguide guiding input light input from an input terminal along a specific direction, and includes an opening section formed along the specific direction. The low refractive index layer has a second refractive index lower that the first refractive index, and is formed so as to cover the high refractive index layer and fill the opening section. The opening section modifies the input light in at least one of direction or speed according to a wavelength of the input light, and outputs the modified light as output light.Type: GrantFiled: April 18, 2017Date of Patent: April 10, 2018Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke Inoue, Tadashi Ichikawa, Akari Nakao, Tatsuya Yamashita, Makoto Nakai
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Publication number: 20180088439Abstract: A switching optical antenna that includes: a waveguide including a light input end and a light output end; a ring waveguide coupled with the waveguide through a first directional coupler; a diffraction grating that is disposed within the ring waveguide and that is coupled with the ring waveguide through a second directional coupler; and a refractive index adjusting section that changes a refractive index of at least a portion of the ring waveguide.Type: ApplicationFiled: September 14, 2017Publication date: March 29, 2018Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke INOUE, Hiroyuki MATSUBARA, Tadashi ICHIKAWA
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Patent number: 9817121Abstract: A radar apparatus which can simply determine the sign of velocity of an object is provided. Laser light reflected by the object undergoes quadrature optical heterodyne detection performed by mixers, optical detectors, and a ?/2 phase shifter, whereby I and Q component signals are output. A frequency analyzer performs FFT on a complex signal composed of the I component signal (real part) and the Q component signal (imaginary part) to thereby obtain its frequency spectrum. Since the frequency spectrum is calculated without being folded back even in a region where the frequency is negative, the sign of the Doppler frequency fd can be determined. When the Doppler frequency fd is positive, the sign of the velocity of the object is a direction toward the radar apparatus. When the Doppler frequency fd is negative, the sign of the velocity of the object is a direction away from the radar apparatus.Type: GrantFiled: December 23, 2014Date of Patent: November 14, 2017Assignee: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke Inoue, Tatsuya Yamashita, Tadashi Ichikawa, Satoru Kato, Kazuo Hasegawa
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Publication number: 20170307810Abstract: A diffraction structure includes a supporting layer, a high refractive index layer, and a low refractive index layer. The high refractive index layer has a first refractive index, is formed above the supporting layer, configures a waveguide guiding input light input from an input terminal along a specific direction, and includes an opening section formed along the specific direction. The low refractive index layer has a second refractive index lower that the first refractive index, and is formed so as to cover the high refractive index layer and fill the opening section. The opening section modifies the input light in at least one of direction or speed according to a wavelength of the input light, and outputs the modified light as output light.Type: ApplicationFiled: April 18, 2017Publication date: October 26, 2017Applicant: KABUSHIKI KAISHA TOYOTA CHUO KENKYUSHOInventors: Daisuke INOUE, Tadashi ICHIKAWA, Akari NAKAO, Tatsuya YAMASHITA, Makoto NAKAI
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Patent number: 9677507Abstract: A purpose of the present invention is to improve the oil removal rate in an oil separator that separates and removes oil from gas including the oil as an impurity. The oil separator according to the present invention is characterized by including a first filter member (42) in a cylindrical shape made with a cylindrical filter material having an air permeability, and positioned such that the target gas flows in from a hollow part as well as a central axis is in an up-down direction, and a second filter member (43) made with a filter material having air permeability and wrapped around the first filter member (42) along an outer surface thereof with a predetermined spacing from the outer surface of the first filter member (42).Type: GrantFiled: December 19, 2012Date of Patent: June 13, 2017Assignees: Tokyo Roki Co., Ltd., Nikki Co., Ltd.Inventors: Takatsugu Kurosawa, Tadashi Ichikawa, Yoshinori Maehira, Takayuki Idehara, Tomoaki Fukuoka, Masashi Iwasaki, Koji Kawayoko, Takaya Kohara
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Publication number: 20150226158Abstract: A purpose of the present invention is to improve the oil removal rate in an oil separator that separates and removes oil from gas including the oil as an impurity. The oil separator according to the present invention is characterized by including a first filter member (42) in a cylindrical shape made with a cylindrical filter material having an air permeability, and positioned such that the target gas flows in from a hollow part as well as a central axis is in an up-down direction, and a second filter member (43) made with a filter material having air permeability and wrapped around the first filter member (42) along an outer surface thereof with a predetermined spacing from the outer surface of the first filter member (42).Type: ApplicationFiled: December 19, 2012Publication date: August 13, 2015Applicants: TOKYO ROKI CO., LTD., NIKKI CO., LTDInventors: Takatsugu Kurosawa, Tadashi Ichikawa, Yoshinori Maehira, Takayuki Idehara, Tomoaki Fukuoka, Masashi Iwasaki, Koji Kawayoko, Takaya Kohara
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Publication number: 20150185244Abstract: A radar apparatus which can simply determine the sign of velocity of an object is provided. Laser light reflected by the object undergoes quadrature optical heterodyne detection performed by mixers, optical detectors, and a ?/2 phase shifter, whereby I and Q component signals are output. A frequency analyzer performs FFT on a complex signal composed of the I component signal (real part) and the Q component signal (imaginary part) to thereby obtain its frequency spectrum. Since the frequency spectrum is calculated without being folded back even in a region where the frequency is negative, the sign of the Doppler frequency fd can be determined. When the Doppler frequency fd is positive, the sign of the velocity of the object is a direction toward the radar apparatus. When the Doppler frequency fd is negative, the sign of the velocity of the object is a direction away from the radar apparatus.Type: ApplicationFiled: December 23, 2014Publication date: July 2, 2015Inventors: Daisuke INOUE, Tatsuya YAMASHITA, Tadashi ICHIKAWA, Satoru KATO, Kazuo HASEGAWA
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Patent number: 8979967Abstract: There is provided a filter device for gas including: a cylindrical filter case formed to be airtight; a hollow filter which is formed with an opening in a bottom part thereof, a top part of which is obstructed, and which is placed inside the filter case in such a manner that a central axis thereof substantially aligns with a central axis of the filter case; and a flow controlling plate which is attached roundly between an outlet in the top part of the filter case and the top part of the hollow filter on an inner peripheral wall of the filter case, wherein gas introduced through an inlet in a bottom part of the filter case is introduced into a hollow part of the hollow filter, and also passes through a space between an outer periphery of the hollow filter and the inner peripheral wall of the filter case, and then is discharged through the outlet.Type: GrantFiled: January 24, 2013Date of Patent: March 17, 2015Assignees: Nikki Co., Ltd., Tokyo Roki Co., Ltd.Inventors: Masashi Iwasaki, Yuka Yorita, Koji Kawayoko, Takaya Kohara, Tomoaki Fukuoka, Takatsugu Kurosawa, Tadashi Ichikawa, Yoshinori Maehira, Takayuki Idehara
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Publication number: 20140059984Abstract: There is provided a filter device for gas including: a cylindrical filter case formed to be airtight; a hollow filter which is formed with an opening in a bottom part thereof, a top part of which is obstructed, and which is placed inside the filter case in such a manner that a central axis thereof substantially aligns with a central axis of the filter case; and a flow controlling plate which is attached roundly between an outlet in the top part of the filter case and the top part of the hollow filter on an inner peripheral wall of the filter case, wherein gas introduced through an inlet in a bottom part of the filter case is introduced into a hollow part of the hollow filter, and also passes through a space between an outer periphery of the hollow filter and the inner peripheral wall of the filter case, and then is discharged through the outlet.Type: ApplicationFiled: January 24, 2013Publication date: March 6, 2014Applicants: TOKYO ROKI CO., LTD., NIKKI CO., LTD.Inventors: Masashi Iwasaki, Yuka Yorita, Koji Kawayoko, Takaya Kohara, Tomoaki Fukuoka, Takatsugu Kurosawa, Tadashi Ichikawa, Yoshinori Maehira, Takayuki Idehara
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Patent number: 7903695Abstract: An optical fiber laser, according to the present invention, has an optical fiber including a core to which a rare earth element is added and a clad disposed around the core, and also has an excitation light source for emitting excitation light incident on a side of the optical fiber. The optical fiber has a corrugated shape on the outer circumference of the clad along the longitudinal direction thereof; and the optical fiber is wound in a spiral form and is bundled in such a way that adjacent sides of the clad are brought into contact with one another.Type: GrantFiled: November 20, 2008Date of Patent: March 8, 2011Assignees: Hitachi Cable, Ltd., Toyota Jidosha Kabushiki Kaisha, Toyota School FoundationInventors: Seiji Kojima, Bing Yao, Kazumasa Ohsono, Akihito Hongo, Akio Sato, Kohei Yanaka, Kazuo Hasegawa, Daisuke Inoue, Hiroshi Ito, Tadashi Ichikawa, Kazuya Saito
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Patent number: 7897987Abstract: A light-emitting device includes a light-emitting diode, a red light-emitting phosphor layer, a yellow light-emitting phosphor layer, and a blue light-emitting phosphor layer. These layers are stacked in the stacking sequence of the yellow, blue, and red phosphor layers in order of increasing distance from the LED. The stacking sequence of the yellow and blue phosphor layers is first determined in such a manner that these layers do not interact with each other. The stacking sequence of the red and yellow phosphor layers and the stacking sequence of the red and blue phosphor layers are determined by the discriminant D. This determination of the stacking sequence suppresses a reduction in the conversion efficiency of the phosphors due to concentration quenching, improving the emission efficiency of the light-emitting device.Type: GrantFiled: March 6, 2009Date of Patent: March 1, 2011Assignee: Toyoda Gosei Co., Ltd.Inventors: Mitsuhiro Inoue, Kenji Ito, Kazuyohi Tomita, Tetsu Kachi, Takahiro Kozawa, Satoru Kato, Tadashi Ichikawa
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Publication number: 20090242917Abstract: A light-emitting device includes a light-emitting diode, a red light-emitting phosphor layer, a yellow light-emitting phosphor layer, and a blue light-emitting phosphor layer. These layers are stacked in the stacking sequence of the yellow, blue, and red phosphor layers in order of increasing distance from the LED. The stacking sequence of the yellow and blue phosphor layers is first determined in such a manner that these layers do not interact with each other. The stacking sequence of the red and yellow phosphor layers and the stacking sequence of the red and blue phosphor layers are determined by the discriminant D. This determination of the stacking sequence suppresses a reduction in the conversion efficiency of the phosphors due to concentration quenching, improving the emission efficiency of the light-emitting device.Type: ApplicationFiled: March 6, 2009Publication date: October 1, 2009Applicant: TOYODA GOSEI CO., LTD.Inventors: Mitsuhiro Inoue, Kenji Ito, Kazuyohi Tomita, Tetsu Kachi, Takahiro Kozawa, Satoru Kato, Tadashi Ichikawa
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Publication number: 20090129411Abstract: An optical fiber laser, according to the present invention, has an optical fiber including a core to which a rare earth element is added and a clad disposed around the core, and also has an excitation light source for emitting excitation light incident on a side of the optical fiber. The optical fiber has a corrugated shape on the outer circumference of the clad along the longitudinal direction thereof; and the optical fiber is wound in a spiral form and is bundled in such a way that adjacent sides of the clad are brought into contact with one another.Type: ApplicationFiled: November 20, 2008Publication date: May 21, 2009Inventors: Seiji Kojima, Bing Yao, Kazumasa Ohsono, Akihito Hongo, Akio Sato, Kohei Yanaka, Kazuo Hasegawa, Daisuke Inoue, Hiroshi Ito, Tadashi Ichikawa, Kazuya Saito
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Publication number: 20090052840Abstract: A plurality of light emitting elements 11 are arranged in parallel with a constant pitch to provide a semiconductor laser bar 10. An optical waveguide 20 has a core part 21 for guiding a light emitted from each of the light emitting elements 11 and a cladding part 22 formed around the core part 21. An optical fiber 30 has a core 31 and a cladding 32 formed around the core 31 for confining the light to the core 31. The optical waveguide is bonded to a side surface of the optical fiber 30, and the light emitted from the semiconductor laser bar 10 is inputted to a side surface of the core 31 of the optical fiber 30 via the core part 21 of the optical waveguide 20.Type: ApplicationFiled: August 20, 2008Publication date: February 26, 2009Applicants: HITACHI CABLE, LTD., TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota School FoundationInventors: Seiji Kojima, Akihito Hongo, Kazumasa Ohsono, Bing Yao, Akio Satou, Kohei Yanaka, Kazuo Hasegawa, Daisuke Inoue, Hiroshi Ito, Tadashi Ichikawa, Kazuya Saito
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Patent number: 6973234Abstract: Each of guided beam incident portions of an optical waveguide device includes a straight incidence area where laser beams enter, a curved area which curves the laser beams entering from the straight incidence area in a predetermined direction, and a widening tapered area which makes the laser beams that have passed through the curved area parallel or substantially parallel to a propagation direction of the laser beams by decreasing propagation angles of the laser beams.Type: GrantFiled: May 28, 2003Date of Patent: December 6, 2005Assignee: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Kazuo Hasegawa, Tadashi Ichikawa, Hiroyuki Matsubara, Mitsutoshi Maeda, Hiroshi Ito
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Publication number: 20030223685Abstract: Each of guided beam incident portions of an optical waveguide device includes a straight incidence area where laser beams enter, a curved area which curves the laser beams entering from the straight incidence area in a predetermined direction, and a widening tapered area which makes the laser beams that have passed through the curved area parallel or substantially parallel to a propagation direction of the laser beams by decreasing propagation angles of the laser beams.Type: ApplicationFiled: May 28, 2003Publication date: December 4, 2003Applicant: Kabushiki Kaisha Toyota Chuo KenkyushoInventors: Kazuo Hasegawa, Tadashi Ichikawa, Hiroyuki Matsubara, Mitsutoshi Maeda, Hiroshi Ito