Patents by Inventor Kiyotaka Eizumi

Kiyotaka Eizumi 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: 20190353857
    Abstract: A condenser lens for collecting a laser beam (300) is disposed between the laser oscillator and the incident end surface of the optical fiber. The laser beam (300) is divided into a plurality of beams (303, 304). The power of the laser beam (304) is measured and maximized by adjusting the position of the condenser lens. The FFP of the laser beam (303) is measured and minimized by adjusting the position of the condenser lens. These adjusted positions are stored as the first and second lens positions. The FFP of the laser beam (303) is measured while the condenser lens is being moved between these positions so as to make the BPP not more than a predetermined value.
    Type: Application
    Filed: November 27, 2017
    Publication date: November 21, 2019
    Inventors: RYO ISHIKAWA, MAKOTO RYUDO, DOUKEI NAGAYASU, HITOSHI NISHIMURA, JINGBO WANG, MASATOSHI NISHIO, HIDEAKI YAMAGUCHI, YOSHIAKI TAKENAKA, KIYOTAKA EIZUMI
  • Publication number: 20190351507
    Abstract: A laser processing head includes parallel plate (17) that shifts an optical axis of a laser beam to be emitted from a top to a bottom of body case (6) from a first optical axis to a second optical axis, parallel plate (19) that shift the optical axis of the laser beam from the second optical axis to a third optical axis, and body case (6) that accommodates holders (7 and 18) that respectively hold parallel plates (17 and 19). The laser processing head further includes a rotation mechanism that rotates holders (7 and 18) around a first rotary axis. Opening (7a) that a laser beam reflected by an incident surface of second parallel plate (19) passes through is formed in holder (7), and light receiving part (6a) that receives the laser beam having passed through opening (7a) is disposed in body case (6).
    Type: Application
    Filed: November 20, 2017
    Publication date: November 21, 2019
    Applicant: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Makoto RYUDO, Doukei NAGAYASU, Hitoshi NISHIMURA, Jingbo WANG, Masatoshi NISHIO, Hideaki YAMAGUCHI, Yoshiaki TAKENAKA, Kiyotaka EIZUMI, Ryo ISHIKAWA
  • Publication number: 20190293873
    Abstract: There is provided an optical axis alignment mechanism between the laser oscillator and the optical fiber. The laser oscillator emits laser light, which then emerges from the emission end of the optical fiber via the axis alignment mechanism. Part of the laser light is received on the light-receiving surface of the CCD camera of a laser light evaluator. Thus, the laser light evaluator acquires a light intensity distribution. The light intensity distribution is used by the optical axis alignment mechanism to align the axis of the laser oscillator with the axis of the optical fiber.
    Type: Application
    Filed: November 29, 2017
    Publication date: September 26, 2019
    Inventors: Kiyotaka EIZUMI, Makoto RYUDO, Doukei NAGAYASU, Hitoshi NISHIMURA, Jingbo WANG, Masatoshi NISHIO, Hideaki YAMAGUCHI, Yoshiaki TAKENAKA, Ryo ISHIKAWA
  • Publication number: 20190278026
    Abstract: A fiber coupling device (100) includes the following components: a wedge plate (102) for receiving light and refracting the light in a predetermined direction, a condenser lens (104) for collecting the light refracted by the wedge plate (102); and an optical fiber (107) having an incident surface for receiving the light collected by the condenser lens (104). The wedge plate (102) is held rotatable around the optical axis (200) of the light incident on the wedge plate (102). The light refracted by the wedge plate (102) and collected by the condenser lens (104) is incident on a different point on the incident surface depending on the rotation angle of the wedge plate (102).
    Type: Application
    Filed: May 30, 2019
    Publication date: September 12, 2019
    Inventors: MASATOSHI NISHIO, HITOSHI NISHIMURA, JINGBO WANG, MAKOTO RYUDO, DOUKEI NAGAYASU, HIDEAKI YAMAGUCHI, YOSHIAKI TAKENAKA, KIYOTAKA EIZUMI, RYO ISHIKAWA, YASUSHI MUKAI
  • Publication number: 20190271588
    Abstract: A laser device includes the following components: a laser resonator for emitting a laser beam; a condenser lens (21) for collecting the laser beam emitted from the laser resonator; an optical fiber (7) for transmitting the laser beam collected by the condenser lens (21); at least one light sensor (5) opposing a light receiving surface of the condenser lens (21) and outside the optical path of the laser beam, the at least one light sensor (5) detecting the amount of return light from the condenser lens (21); and a controller for determining the presence of an abnormality when the value of the amount detected by any of the at least one light sensor (5) is greater than the predetermined maximum threshold.
    Type: Application
    Filed: May 21, 2019
    Publication date: September 5, 2019
    Inventors: JINGBO WANG, DOUKEI NAGAYASU, YOSHIAKI TAKENAKA, HITOSHI NISHIMURA, MAKOTO RYUDO, KIYOTAKA EIZUMI, HIDEAKI YAMAGUCHI, RYO ISHIKAWA, MASATOSHI NISHIO, TAKASI KAKUTANI, YASUSHI MUKAI, MITSURU MUKAI, HIROYUKI HAYASHIKAWA
  • Publication number: 20190262938
    Abstract: Laser processing device (1) includes: laser-beam switching apparatus (70) that switches between a first optical path and a second optical path as an optical path along which a laser beam is to travel, the first optical path including first fiber (11), the second optical path including second fiber (21) that has a core diameter that is larger than a core diameter of first fiber (11); and processing head (80) that illuminates a same processed point on workpiece (900) with a laser beam that has passed through the first optical path or the second optical path. When illumination with laser beam that has passed through the first optical path is performed for a predetermined period of time, laser-beam switching apparatus (70) switches from the first optical path to the second optical path.
    Type: Application
    Filed: May 10, 2019
    Publication date: August 29, 2019
    Inventors: DOUKEI NAGAYASU, HITOSHI NISHIMURA, JINGBO WANG, MAKOTO RYUDO, MASATOSHI NISHIO, HIDEAKI YAMAGUCHI, YOSHIAKI TAKENAKA, KIYOTAKA EIZUMI, RYO ISHIKAWA
  • Publication number: 20190064451
    Abstract: A fiber spatial coupling device includes a detachable process fiber, an optical system, and a main body. The process fiber guides laser light. The optical system collects the laser light into the process fiber. The main body holds the optical system, and has a supply port for supplying gas to a space between the process fiber and the optical system.
    Type: Application
    Filed: February 27, 2017
    Publication date: February 28, 2019
    Inventors: YOSHIAKI TAKENAKA, HITOSHI NISHIMURA, MAKOTO RYUDO, JINGBO WANG, MASATOSHI NISHIO, KIYOTAKA EIZUMI, HIDEAKI YAMAGUCHI, RYO ISHIKAWA, DOUKEI NAGAYASU
  • Publication number: 20190030641
    Abstract: A fiber coupling device includes a housing and a window provided in the housing. The fiber coupling device is configured to collectively guide plural laser beams to at least a first fiber, the plurality of laser beams each being emitted from a corresponding one of plural external laser light sources and entering through a laser beam inlet. The housing is configured such that the laser beams enter the housing from the laser beam inlet. The window is provided inside the housing and faces the laser beam inlet. The fiber coupling device is not required to detach when an optical axis is adjusted.
    Type: Application
    Filed: March 7, 2017
    Publication date: January 31, 2019
    Inventors: DOUKEI NAGAYASU, HITOSHI NISHIMURA, MAKOTO RYUDO, JINGBO WANG, YOSHIAKI TAKENAKA, KIYOTAKA EIZUMI, HIDEAKI YAMAGUCHI, RYO ISHIKAWA, MASATOSHI NISHIO
  • Patent number: 8750083
    Abstract: An optical pickup apparatus includes at least: a light emitting element capable of emitting at least first wavelength light and second wavelength light; and a diffraction grating configured to split the first wavelength light into at least a first main beam and a first sub-beam and to split the second wavelength light into at least a second main beam and a second sub-beam, a following expression (1) being satisfied: 1.05 < Yp ? ? 1 Yp ? ? 2 < 2.50 ( 1 ) where: Yp1 is an interval between the first main beam and the first sub-beam when a first media corresponding to the first wavelength light is irradiated with the first main beam and the first sub-beam, and Yp2 is an interval between the second main beam and the second sub-beam when a second media corresponding to the second wavelength light is irradiated with the second main beam and the second sub-beam.
    Type: Grant
    Filed: April 27, 2011
    Date of Patent: June 10, 2014
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Minoru Sato, Kiyotaka Eizumi, Shuichi Ichiura
  • Patent number: 8315140
    Abstract: An optical pickup apparatus comprising: a laser light source configured to emit a laser beam; an objective lens configured to apply the laser beam to an optical recording medium; and a beam splitter including a first reflective film configured to reflect the laser beam so as to be directed to the objective lens, the beam splitter interposed in an optical path between the laser light source and the objective lens, an incidence polarization angle of the laser beam relative to the first reflective film being set such that a P-polarization component is greater than an S-polarization component in linear polarization components of the laser beam incident on the first reflective film.
    Type: Grant
    Filed: July 20, 2010
    Date of Patent: November 20, 2012
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Minoru Sato, Kiyotaka Eizumi, Chiaki Asakawa
  • Publication number: 20120182850
    Abstract: An optical pickup apparatus includes at least: a light emitting element capable of emitting at least first wavelength light and second wavelength light; and a diffraction grating configured to split the first wavelength light into at least a first main beam and a first sub-beam and to split the second wavelength light into at least a second main beam and a second sub-beam, a following expression (1) being satisfied: 1.05 < Yp ? ? 1 Yp ? ? 2 < 2.50 ( 1 ) where: Yp1 is an interval between the first main beam and the first sub-beam when a first media corresponding to the first wavelength light is irradiated with the first main beam and the first sub-beam, and Yp2 is an interval between the second main beam and the second sub-beam when a second media corresponding to the second wavelength light is irradiated with the second main beam and the second sub-beam.
    Type: Application
    Filed: April 27, 2011
    Publication date: July 19, 2012
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Minoru Sato, Kiyotaka Eizumi, Shuichi Ichiura
  • Patent number: 8081556
    Abstract: An optical-pickup apparatus comprising: a laser-light source including first-and-second-light-emitting points for laser lights with first-and-second wavelengths which points are disposed at positions deviating in a direction optically corresponding to an optical-disc-tracking direction; a diffraction grating including a plurality of periodic structures which are joined to be different in phase from each other in the direction and each of which includes a recess and projection repeated in a direction optically corresponding to an optical-disc-tangential direction, the diffraction grating being configured to generate main-and-sub-luminous fluxes from the laser light; a holder to hold the diffraction grating to be movable in the direction corresponding to the tracking direction; a collimating lens; an objective lens to focus the main-and-sub-luminous fluxes from the collimating lens on the same track of an optical disc; and a photodetector to be applied with reflected lights of the main-and-sub-luminous fluxes f
    Type: Grant
    Filed: September 11, 2009
    Date of Patent: December 20, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kiyotaka Eizumi, Minoru Sato
  • Publication number: 20110170397
    Abstract: An optical pickup apparatus comprising: a laser light source configured to emit a laser beam; an objective lens configured to apply the laser beam to an optical recording medium; and a beam splitter including a first reflective film configured to reflect the laser beam so as to be directed to the objective lens, the beam splitter interposed in an optical path between the laser light source and the objective lens, an incidence polarization angle of the laser beam relative to the first reflective film being set such that a P-polarization component is greater than an S-polarization component in linear polarization components of the laser beam incident on the first reflective film.
    Type: Application
    Filed: July 20, 2010
    Publication date: July 14, 2011
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Minoru Sato, Kiyotaka Eizumi, Chiaki Asakawa
  • Patent number: 7974172
    Abstract: An optical-pickup apparatus comprising: a laser-light source; a diffraction grating including first-and-second regions of periodic structures different in phase from each other and a third region whose periodic structure is different in phase from the first-and-second regions; an objective lens focusing main-and-sub-luminous fluxes generated by the diffraction grating on the same optical-disc track; and a photodetector to receive reflected light of the main-and-sub-luminous fluxes from an optical disc and output a detection signal for generating main-and-sub-push-pull signals, a relationship between an incident light width in the objective lens corresponding to the third region and pupil diameters of the objective lens corresponding to first-and-second wavelengths of laser lights being adjusted so that a ratio of minimum value to maximum value of a differential-push-pull-signal is at substantially 50% or more and a ratio of sub-push-pull-signal level to main-push-pull-signal level is at substantially 15% or m
    Type: Grant
    Filed: September 17, 2009
    Date of Patent: July 5, 2011
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Kiyotaka Eizumi, Minoru Sato
  • Publication number: 20100067350
    Abstract: An optical-pickup apparatus comprising: a laser-light source; a diffraction grating including first-and-second regions of periodic structures different in phase from each other and a third region whose periodic structure is different in phase from the first-and-second regions; an objective lens focusing main-and-sub-luminous fluxes generated by the diffraction grating on the same optical-disc track; and a photodetector to receive reflected light of the main-and-sub-luminous fluxes from an optical disc and output a detection signal for generating main-and-sub-push-pull signals, a relationship between an incident light width in the objective lens corresponding to the third region and pupil diameters of the objective lens corresponding to first-and-second wavelengths of laser lights being adjusted so that a ratio of minimum value to maximum value of a differential-push-pull-signal is at substantially 50% or more and a ratio of sub-push-pull-signal level to main-push-pull-signal level is at substantially 15% or m
    Type: Application
    Filed: September 17, 2009
    Publication date: March 18, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kiyotaka Eizumi, Minoru Sato
  • Publication number: 20100067355
    Abstract: An optical-pickup apparatus comprising: a laser-light source including first-and-second-light-emitting points for laser lights with first-and-second wavelengths which points are disposed at positions deviating in a direction optically corresponding to an optical-disc-tracking direction; a diffraction grating including a plurality of periodic structures which are joined to be different in phase from each other in the direction and each of which includes a recess and projection repeated in a direction optically corresponding to an optical-disc-tangential direction, the diffraction grating being configured to generate main-and-sub-luminous fluxes from the laser light; a holder to hold the diffraction grating to be movable in the direction corresponding to the tracking direction; a collimating lens; an objective lens to focus the main-and-sub-luminous fluxes from the collimating lens on the same track of an optical disc; and a photodetector to be applied with reflected lights of the main-and-sub-luminous fluxes f
    Type: Application
    Filed: September 11, 2009
    Publication date: March 18, 2010
    Applicant: Sanyo Electric Co., Ltd.
    Inventors: Kiyotaka Eizumi, Minoru Sato
  • Patent number: 7672202
    Abstract: An optical pickup apparatus comprising: a diffraction grating including a first grating for diffracting a first laser light beam, and a second grating for diffracting a second laser light beam which is shorter in wavelength than the first laser light beam, the diffraction grating being disposed in a common optical path for guiding the first laser light beam and the second laser light beam to an optical disc; and a photo detector including in a first light receiving area, a main light receiving unit, a front sub-light receiving unit, and a rear sub-light receiving unit that receive reflected light beams, which are reflected by the optical disc, of a main beam, of a front sub-beam, and of a rear sub-beam, respectively, the first laser light beam being diffracted by the diffraction grating into the main beam, the front sub-beam formed in front of the main beam, and the rear sub-beam formed at the back of the main beam, wherein the first grating is set such that the front sub-light receiving unit and the rear sub
    Type: Grant
    Filed: November 16, 2006
    Date of Patent: March 2, 2010
    Assignee: Sanyo Electric Co., Ltd.
    Inventors: Tohru Hotta, Yoshio Hayashi, Noriyoshi Ooyama, Kiyotaka Eizumi
  • Publication number: 20070127349
    Abstract: An optical pickup apparatus comprising: a diffraction grating including a first grating for diffracting a first laser light beam, and a second grating for diffracting a second laser light beam which is shorter in wavelength than the first laser light beam, the diffraction grating being disposed in a common optical path for guiding the first laser light beam and the second laser light beam to an optical disc; and a photo detector including in a first light receiving area, a main light receiving unit, a front sub-light receiving unit, and a rear sub-light receiving unit that receive reflected light beams, which are reflected by the optical disc, of a main beam, of a front sub-beam, and of a rear sub-beam, respectively, the first laser light beam being diffracted by the diffraction grating into the main beam, the front sub-beam formed in front of the main beam, and the rear sub-beam formed at the back of the main beam, wherein the first grating is set such that the front sub-light receiving unit and the rear sub
    Type: Application
    Filed: November 16, 2006
    Publication date: June 7, 2007
    Applicant: SANYO ELECTRIC CO., LTD.
    Inventors: Tohru Hotta, Yoshio Hayashi, Noriyoshi Ooyama, Kiyotaka Eizumi