Patents by Inventor Tomotaka Katsura

Tomotaka Katsura 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).

  • Publication number: 20200028332
    Abstract: A wavelength combining laser apparatus includes: a semiconductor laser emitting laser beams in an optical-axial direction perpendicular to a laser beam combining direction; a wavelength combining element combining the laser beams in the laser beam combining direction into a single laser beam; a cross-coupling reduction optical system having positive power in the laser beam combining direction perpendicular to an optical axis of the single laser beam output from the wavelength combining element; and a partially-reflective mirror reflecting the single laser beam having passed through the cross-coupling reduction optical system and also allowing the single laser beam to transmit through and exit the partially-reflective mirror.
    Type: Application
    Filed: January 12, 2018
    Publication date: January 23, 2020
    Applicant: Mitsubishi Electric Corporation
    Inventors: Nobutaka KOBAYASHI, Tomotaka KATSURA, Daiji MORITA, Junichi NISHIMAE, Tomohiro KYOTO
  • Publication number: 20190366477
    Abstract: A laser machining device includes a plurality of oscillators to emit laser beams having different wavelengths from each other; a machining head to emit laser beams emitted from the respective oscillators to a machining object; a plurality of transmission fibers to transmit the laser beams to the machining head; a wavelength dispersion element; and a focusing lens to superpose the laser beams emitted from the transmission fibers, wherein the wavelength dispersion element is arranged at a position at which the laser beams are superposed by the focusing lens.
    Type: Application
    Filed: March 21, 2017
    Publication date: December 5, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Daiji MORITA, Tomotaka KATSURA, Hiroaki KUROKAWA
  • Patent number: 10498107
    Abstract: A laser device causes, with a plurality of laser media that generate laser beams having wavelengths different from one another, a convergent lens to cause laser beams each emitted from the plurality of laser media to overlap one another on a dispersive element to form a single combined beam. The dispersive element is positioned where the plurality of laser beams are caused to overlap one another by the convergent lens to form a single beam, causes a portion of the plurality of laser beams to return back toward the laser media as a first laser beam flux, and outputs another portion of the plurality of laser beams as a second laser beam flux having a single optical axis.
    Type: Grant
    Filed: January 20, 2017
    Date of Patent: December 3, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomohiro Kyoto, Junichi Nishimae, Tomotaka Katsura, Daiji Morita
  • Publication number: 20190363517
    Abstract: A laser oscillator includes: a plurality of laser media to emit laser beams having different wavelengths; a diffraction grating to emit, in a superimposed state, the laser beams incident from the laser media; a partially reflective element to reflect part of the laser beams emitted from the diffraction grating and return the part of the laser beams to the diffraction grating, and to transmit a remainder; and a plurality of lenses each disposed between a corresponding one of the laser media and the diffraction grating. The lenses are each disposed in an optical path formed between a corresponding one of the laser media and the diffraction grating, and the lenses superimpose the laser beams from the laser media on an incident surface of the diffraction grating such that the laser beams have an equal outer diameter.
    Type: Application
    Filed: March 1, 2017
    Publication date: November 28, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Junichi NISHIMAE, Tomotaka KATSURA, Daiji MORITA, Hiroaki KUROKAWA
  • Publication number: 20190348817
    Abstract: A laser device causes, with a plurality of laser media that generate laser beams having wavelengths different from one another, a convergent lens to cause laser beams each emitted from the plurality of laser media to overlap one another on a dispersive element to form a single combined beam. The dispersive element is positioned where the plurality of laser beams are caused to overlap one another by the convergent lens to form a single beam, causes a portion of the plurality of laser beams to return back toward the laser media as a first laser beam flux, and outputs another portion of the plurality of laser beams as a second laser beam flux having a single optical axis.
    Type: Application
    Filed: January 20, 2017
    Publication date: November 14, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tomohiro KYOTO, Junichi NISHIMAE, Tomotaka KATSURA, Daiji MORITA
  • Patent number: 10461506
    Abstract: A laser oscillation apparatus includes a wave plate and a diffraction grating disposed between a laser beam source and a partial reflection mirror. The wave plate changes polarization directions of laser beams emitted from semiconductor lasers to a second direction perpendicular to a first direction. The diffraction grating is disposed at a position where laser beams polarized in the first direction are superposed into one beam and laser beams whose polarization directions are changed to the second direction are superposed into one beam, superposes laser beams polarized in the first direction to have one optical axis, superposes laser beams polarized in the second direction to have one optical axis, and outputs superposed laser beams toward the partial reflection mirror. The laser oscillation apparatus includes a birefringent element to combine laser beams having mutually different optical axes output from the partial reflection mirror into one laser beams having one optical axis.
    Type: Grant
    Filed: March 17, 2017
    Date of Patent: October 29, 2019
    Assignee: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomohiro Kyoto, Tomotaka Katsura, Daiji Morita
  • Publication number: 20190267777
    Abstract: A laser oscillation apparatus includes a wave plate and a diffraction grating disposed between a laser beam source and a partial reflection mirror. The wave plate changes polarization directions of laser beams emitted from semiconductor lasers to a second direction perpendicular to a first direction. The diffraction grating is disposed at a position where laser beams polarized in the first direction are superposed into one beam and laser beams whose polarization directions are changed to the second direction are superposed into one beam, superposes laser beams polarized in the first direction to have one optical axis, superposes laser beams polarized in the second direction to have one optical axis, and outputs superposed laser beams toward the partial reflection mirror. The laser oscillation apparatus includes a birefringent element to combine laser beams having mutually different optical axes output from the partial reflection mirror into one laser beams having one optical axis.
    Type: Application
    Filed: March 17, 2017
    Publication date: August 29, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Tomohiro KYOTO, Tomotaka KATSURA, Daiji MORITA
  • Publication number: 20190252844
    Abstract: A laser oscillator includes: an external resonator configured to include laser media to emit laser beams having different wavelengths; and a partially reflective mirror to transmit part of the laser beams and reflect and return a remainder toward the laser media. The external resonator includes therein: a diffraction grating to perform wavelength coupling on the laser beams having different wavelengths emitted from the laser media so as to superimpose the laser beams into one laser beam and to emit, to the partially reflective mirror, the one laser beam; and a prism that is placed between the laser media and the diffraction grating and that superimposes the laser beams into one laser beam on the diffraction grating, the prism including two surfaces forming an apex angle, one of the two surfaces being an incident surface and another of the two surfaces being an exit surface.
    Type: Application
    Filed: February 13, 2017
    Publication date: August 15, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Junichi NISHIMAE, Tomotaka KATSURA, Daiji MORITA, Hiroaki KUROKAWA
  • Publication number: 20190126395
    Abstract: A laser machining apparatus includes: a laser oscillator that emits laser light (L) having a plurality of wavelengths; a transmission diffractive optical element (21) that allows the laser light (L) to pass therethrough; a machining lens (3) that concentrates the laser light (L) that has passed through the transmission diffractive optical element (21); a distance adjustment mechanism (31) that changes a distance between the transmission diffractive optical element (21) and the machining lens (3); and an angle adjustment mechanism (32) that changes an angle of the transmission diffractive optical element (21) to switch between a state in which the laser light (L) is dispersed by the transmission diffractive optical element (21) and then enters the machining lens (3) and a state in which the laser light (L) enters the machining lens (3) without being dispersed by the transmission diffractive optical element (21).
    Type: Application
    Filed: July 5, 2017
    Publication date: May 2, 2019
    Applicant: Mitsubishi Electric Corporation
    Inventors: Naoyuki NAKAMURA, Masaki SEGUCHI, Tomotaka KATSURA, Daiji MORITA
  • Patent number: 9919945
    Abstract: A laser processing method that can reduce warpage occurring in a glass and reduce a stress generated on the glass at a time of releasing a protective material from the glass. The laser processing method includes: forming the protective materials on both surfaces of the glass; processing the glass by radiating a laser beam onto the glass together with the protective materials after the protective material formation; and releasing the protective materials from the glass after the laser processing.
    Type: Grant
    Filed: October 10, 2014
    Date of Patent: March 20, 2018
    Assignee: Mitsubishi Electric Corporation
    Inventors: Reona Hirayama, Shuichi Fujikawa, Tomotaka Katsura
  • Publication number: 20170207605
    Abstract: A semiconductor laser device, in which, between a wavelength dispersive element and a partially reflecting mirror, such an anamorphic prism pair is arranged that is configured to increase an angle formed by a regular oscillation optical axis of a regular oscillation beam emitted from each of light emitting points and a cross-coupling optical axis of a cross-coupling oscillation beam oscillating through a different one of the light emitting points. It is therefore possible to increase oscillation loss of the cross-coupling oscillation beam, thereby improving focusing properties, without increasing the device in size.
    Type: Application
    Filed: July 24, 2015
    Publication date: July 20, 2017
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Daiji MORITA, Masato KAWASAKI, Susumu KONNO, Tomotaka KATSURA, Shuichi FUJIKAWA
  • Publication number: 20160344162
    Abstract: A beam combining device causing beams from a plurality of light sources and one or a plurality of spare light sources to enter a beam combining optical system, and to be combined and output after passing through a beam combining element. The beam combining device is configured to: detect a failure in the plurality of light sources; and move at least a part of the respective light sources, the spare light source, and the beam combining optical system, to cause a beam to enter the beam combining optical system from the spare light source instead of a beam from the failed light source, and to cause the beam to be combined to beams from the plurality of light sources on an optical path after the beam combining element.
    Type: Application
    Filed: January 22, 2015
    Publication date: November 24, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Susumu KONNO, Masato KAWASAKI, Daiji MORITA, Tomotaka KATSURA, Shuichi FUJIKAWA
  • Publication number: 20160329685
    Abstract: A semiconductor laser device including an external resonator including: emitters of a semiconductor laser which output a plurality of beams having different wavelengths; a combining optical system which spatially overlaps the plurality of beams output from the semiconductor laser; a wavelength dispersive element which overlaps the overlapped plurality of beams into a single beam by wavelength dispersion; and a partial reflecting mirror which reflects a portion of the single beam and returns same to the wavelength dispersive element, wherein when the width of the wavelength dispersive element in a direction in which the single beam is separated into a plurality of beams by wavelength dispersion is taken as a wavelength dispersive element width, and when the beam upon establishment of normal oscillation is taken as a normal oscillation beam, the wavelength dispersive element width is the same size as the width of the normal oscillation beam.
    Type: Application
    Filed: December 4, 2014
    Publication date: November 10, 2016
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Tomotaka KATSURA, Daiji MORITA, Susumu KONNO, Shuichi FUJIKAWA
  • Publication number: 20160251251
    Abstract: A laser processing method that can reduce warpage occurring in a glass and reduce a stress generated on the glass at a time of releasing a protective material from the glass. The laser processing method includes: forming the protective materials on both surfaces of the glass; processing the glass by radiating a laser beam onto the glass together with the protective materials after the protective material formation; and releasing the protective materials from the glass after the laser processing.
    Type: Application
    Filed: October 10, 2014
    Publication date: September 1, 2016
    Applicant: Mitsubishi Electric Corporation
    Inventors: Reona HIRAYAMA, Shuichi FUJIKAWA, Tomotaka KATSURA
  • Patent number: 9331457
    Abstract: A semiconductor laser apparatus, including: a beam divergence angle correction optical system for correcting a divergence angle of beams generated from light emitting points of a semiconductor laser bar; a beam rotation optical system for rotating the beams each having the corrected divergence angle; a wavelength dispersion optical element having a wavelength dispersion function; and a partial reflection mirror. A relative position of the beam divergence angle correction optical system with respect to the light emitting point in a divergence angle correction direction is changed for each light emitting point.
    Type: Grant
    Filed: October 1, 2013
    Date of Patent: May 3, 2016
    Assignee: Mitsubishi Electric Corporation
    Inventors: Daiji Morita, Tomotaka Katsura, Susumu Konno, Shuichi Fujikawa, Satoshi Nishida, Kenji Kumamoto, Naoki Miyamoto, Hiroaki Kurokawa
  • Patent number: 9188834
    Abstract: A wavelength conversion crystal including: a single nonlinear optical crystal which satisfies both of a first phase-matching condition and a second phase-matching condition, the first phase-matching condition being required for first wavelength conversion to convert a fundamental wave having a wavelength of 1064 nm into a second harmonic having a wavelength of 532 nm, and the second phase-matching condition being required for second wavelength conversion to convert the light having a wavelength of 532 nm into a fourth harmonic having a wavelength of 266 nm; and a first reflective face and a second reflective face for reflecting the light having a wavelength of 532 nm generated by the first wavelength conversion to supply it to the second wavelength conversion. This approach can efficiently generate a third or higher-order harmonic with a reliable and simple configuration.
    Type: Grant
    Filed: March 13, 2012
    Date of Patent: November 17, 2015
    Assignee: Mitsubishi Electric Corporation
    Inventors: Shuichi Fujikawa, Susumu Konno, Keisuke Furuta, Tomotaka Katsura
  • Publication number: 20150303656
    Abstract: A semiconductor laser apparatus, including: a beam divergence angle correction optical system for correcting a divergence angle of beams generated from light emitting points of a semiconductor laser bar; a beam rotation optical system for rotating the beams each having the corrected divergence angle; a wavelength dispersion optical element having a wavelength dispersion function; and a partial reflection mirror. A relative position of the beam divergence angle correction optical system with respect to the light emitting point in a divergence angle correction direction is changed for each light emitting point.
    Type: Application
    Filed: October 1, 2013
    Publication date: October 22, 2015
    Applicant: MITSUBISHI ELECTRIC CORPORATION
    Inventors: Daiji MORITA, Tomotaka KATSURA, Susumu KONNO, Shuichi FUJIKAWA, Satoshi NISHIDA, Kenji KUMAMOTO, Naoki MIYAMOTO, Hiroaki KUROKAWA
  • Patent number: 8767786
    Abstract: To provide a conveying unit that holds a workpiece and conveys the workpiece at a constant rate in one direction, a laser oscillator that emits a pulsed laser beam, a splitter that splits a pulsed laser beam into a pattern having a predetermined geometric pitch, a first deflector that scans the split pulsed laser beam in the other direction substantially orthogonal to the one direction, a second deflector that adjusts and deflects the split pulsed laser beam deflected by the first deflector on the surface to be processed in the one direction so as to scan the resultant pulsed laser beam onto the surface to be processed at a constant rate equal to a rate at which the workpiece is conveyed, and a condenser that condenses the split pulsed laser beam deflected by the second deflector onto the surface to be processed.
    Type: Grant
    Filed: April 21, 2009
    Date of Patent: July 1, 2014
    Assignee: Mitsubishi Electric Corporation
    Inventors: Tomotaka Katsura, Tatsuki Okamoto, Kunihiko Nishimura
  • Publication number: 20140016186
    Abstract: A wavelength conversion crystal including: a single nonlinear optical crystal which satisfies both of a first phase-matching condition and a second phase-matching condition, the first phase-matching condition being required for first wavelength conversion to convert a fundamental wave having a wavelength of 1064 nm into a second harmonic having a wavelength of 532 nm, and the second phase-matching condition being required for second wavelength conversion to convert the light having a wavelength of 532 nm into a fourth harmonic having a wavelength of 266 nm; and a first reflective face and a second reflective face for reflecting the light having a wavelength of 532 nm generated by the first wavelength conversion to supply it to the second wavelength conversion. This approach can efficiently generate a third or higher-order harmonic with a reliable and simple configuration.
    Type: Application
    Filed: March 13, 2012
    Publication date: January 16, 2014
    Applicant: Mitsubishi Electric Corporation
    Inventors: Shuichi Fujikawa, Susumu Konno, Keisuke Furuta, Tomotaka Katsura
  • Patent number: 8482813
    Abstract: An image-scanning device wherein plural images of an object are picked up inverted and reduced in size by image-forming optical systems arranged to be adjacent to each other, and then restored by an image processing system. Each optical system includes a first optical element having a first focal length; an aperture member located at a focus position in a rear side of the first optical element; and a second optical element provided in a rear side of the aperture member and having a second focal length shorter than the first focal length, respectively disposed from a side of the object being picked up to a side of the image pickup device. In between optical systems, corresponding image pick up devices thereof are arranged to be adjacent to each other, the image pickup devices including a region in which the images picked up by the image pickup devices are overlapped.
    Type: Grant
    Filed: March 26, 2008
    Date of Patent: July 9, 2013
    Assignee: Mitsubishi Electric Corporation
    Inventors: Hiroyuki Kawano, Tatsuki Okamoto, Tomotaka Katsura, Junichi Nishimae