Patents by Inventor Kazuki Kuba
Kazuki Kuba 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: 20240042546Abstract: A laser processing machine to perform laser processing by focusing a laser beam onto a workpiece, includes a light-focusing optical system to focus the laser beam, wherein the light-focusing optical system has an aberration, and a lateral aberration with respect to a laser beam diameter:D86.5 containing 86.5% of the laser power of a laser beam before being focused is 0.2 mm or more, the lateral aberration being at a light focusing point relative to a light beam corresponding to the laser beam diameter:D86.5.Type: ApplicationFiled: October 6, 2023Publication date: February 8, 2024Applicants: Mitsubishi Electric Corporation, TADA ELECTRIC CO., LTD.Inventors: Kazuki KUBA, Akihiro UENO, Toshinobu EGUCHI, Masaru YOSHIDA, Junji MIYATA
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Patent number: 11822125Abstract: A multiplexing optical system includes a light source, a lens and a lens array. The light source includes a plurality of light emitting elements of surface emitting lasers. The lens is configured to change and condense optical paths of laser light beams emitted from the light emitting elements. The lens array includes a plurality of lens regions arrayed so as to correspond to respective optical paths of the laser light beams changed by the lens, and is configured to condense the laser light beams by the lens regions to form a multiplexed beam.Type: GrantFiled: September 13, 2019Date of Patent: November 21, 2023Assignees: MITSUBISHI ELECTRIC CORPORATION, KYOTO UNIVERSITYInventors: Yoko Inoue, Masato Kawasaki, Tatsuya Yamamoto, Kazuki Kuba, Susumu Noda
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Publication number: 20210318493Abstract: A multiplexing optical system includes a light source, a lens and a lens array. The light source includes a plurality of light emitting elements of surface emitting lasers. The lens is configured to change and condense optical paths of laser light beams emitted from the light emitting elements. The lens array includes a plurality of lens regions arrayed so as to correspond to respective optical paths of the laser light beams changed by the lens, and is configured to condense the laser light beams by the lens regions to form a multiplexed beam.Type: ApplicationFiled: September 13, 2019Publication date: October 14, 2021Applicants: Mitsubishi Electric Corporation, Kyoto UniversityInventors: Yoko INOUE, Masato KAWASAKI, Tatsuya YAMAMOTO, Kazuki KUBA, Susumu NODA
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Publication number: 20200238438Abstract: A laser processing machine to perform laser processing by focusing a laser beam onto a workpiece, includes a light-focusing optical system to focus the laser beam, wherein the light-focusing optical system has an aberration, and a lateral aberration with respect to a laser beam diameter: D86.5 containing 86.5% of the laser power of a laser beam before being focused is 0.2 mm or more, the lateral aberration being at a light focusing point relative to a light beam corresponding to the laser beam diameter: D86.5.Type: ApplicationFiled: October 11, 2018Publication date: July 30, 2020Applicants: Mitsubishi Electric Corporation, TADA ELECTRIC CO., LTD.Inventors: Kazuki KUBA, Akihiro UENO, Toshinobu EGUCHI, Masaru YOSHIDA, Junji MIYATA
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Patent number: 10355441Abstract: A laser module includes: a photonic crystal surface-emitting laser element; a collimating lens array for producing a parallel optical beam; a condenser lens for condensing the optical beam; and an optical fiber which receives the optical beam on one end and transmits the optical beam to the outside. In the collimating lens array, an aperture portion corresponding to a collimating lens allows passage of the optical beam with an energy of not less than 94.0% and not more than 99.5% with respect to 100% of the energy of the optical beam incident on the collimating lens array.Type: GrantFiled: April 7, 2016Date of Patent: July 16, 2019Assignees: MITSUBISHI ELECTRIC CORPORATION, KYOTO UNIVERSITY, HAMAMATSU PHOTONICS KK., ROHM CO., LTD.Inventors: Tatsuya Yamamoto, Kazuki Kuba, Masato Kawasaki, Yoko Inoue, Tetsuo Kojima, Junichi Nishimae, Susumu Noda
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Patent number: 10166631Abstract: A laser processing head apparatus with a camera monitor includes a light source for illumination having a near-infrared laser diode that generates a near-infrared laser beam of which upper limit value is a wavelength of a laser beam for processing, and out of processing point-emitted light, a processing point-reflected laser beam and illumination light for imaging, which have passed through a condensed lens and a laser beam reflection mirror and are directed to the camera respectively. An optical filter blocks transmission of the processing point-emitted light and the processing point-reflected laser beam, and transmits the illumination light for imaging.Type: GrantFiled: March 2, 2015Date of Patent: January 1, 2019Assignee: MITSUBISHI ELECTRONIC CORPORATIONInventors: Kazuki Kuba, Naoyuki Nakamura, Akihiro Ueno
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Publication number: 20180348451Abstract: A laser module includes: a photonic crystal surface-emitting laser element; a collimating lens array for producing a parallel optical beam; a condenser lens for condensing the optical beam; and an optical fiber which receives the optical beam on one end and transmits the optical beam to the outside. In the collimating lens array, an aperture portion corresponding to a collimating lens allows passage of the optical beam with an energy of not less than 94.0% and not more than 99.5% with respect to 100% of the energy of the optical beam incident on the collimating lens array.Type: ApplicationFiled: April 7, 2016Publication date: December 6, 2018Applicants: Mitsubishi Electric Corporation, Kyoto University, HAMAMATSU PHOTONICS K.K., ROHM CO., LTD.Inventors: Tatsuya YAMAMOTO, Kazuki KUBA, Masato KAWASAKI, Yoko INOUE, Tetsuo KOJIMA, Junichi NISHIMAE, Susumu NODA
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Publication number: 20180175590Abstract: A semiconductor laser device includes: a semiconductor laser bar to output a plurality of beams with different wavelengths from a continuous light-emitting region; a light-condensing optical system to condense the beams; a wavelength-dispersive optical element having a wavelength dispersing function; an optical filter in which a wavelength of a beam that passes therethrough differs periodically; an aperture located on an optical path of the beams superimposed on an identical axis; and a partially reflecting mirror. A totally reflecting mirror is formed on a back side of the semiconductor laser bar, and wavelengths of a plurality of beams with different wavelengths reflected by the totally reflecting mirror and output from the semiconductor laser bar are respectively identical to wavelengths of beams that pass through the optical filter.Type: ApplicationFiled: December 25, 2015Publication date: June 21, 2018Applicant: Mitsubishi Electric CorporationInventors: Tatsuya YAMAMOTO, Daiji MORITA, Masato KAWASAKI, Kazuki KUBA, Junichi NISHIMAE, Tetsuo KOJIMA
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Publication number: 20170043431Abstract: A laser processing head apparatus with a camera monitor includes a light source for illumination having a near-infrared laser diode that generates a near-infrared laser beam of which upper limit value is a wavelength of a laser beam for processing, and out of processing point-emitted light, a processing point-reflected laser beam and illumination light for imaging, which have passed through a condensed lens and a laser beam reflection mirror and are directed to the camera respectively. An optical filter blocks transmission of the processing point-emitted light and the processing point-reflected laser beam, and transmits the illumination light for imaging.Type: ApplicationFiled: March 2, 2015Publication date: February 16, 2017Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kazuki KUBA, Naoyuki NAKAMURA, Akihiro UENO
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Publication number: 20120031883Abstract: The machining device is equipped with a fiber laser oscillator for oscillating laser light of a top hat shape, and a light collecting lens and a machining head for collecting the laser light of the top hat shape and emitting the laser light onto a machining target such that the beam diameter of the laser light of the top hat shape at a position where light intensity becomes the one corresponding to a machining threshold of the machining target is about three times the size of the beam diameter of laser light in a Gaussian mode at the same position, when the laser light in the Gaussian mode has a beam quality substantially the same as that of the laser light of the top hat shape.Type: ApplicationFiled: May 14, 2010Publication date: February 9, 2012Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Kenji Kumamoto, Yushi Takenaka, Kazuki Kuba, Toru Murai, Taira Ogita, Junichi Nishimae, Keisuke Furuta
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Patent number: 7608799Abstract: A solid-state laser processing apparatus includes a solid-state laser oscillator, a laser beam diameter controller, an optical fiber, and a processing head. The solid-state laser oscillator oscillates a laser beam. The laser beam diameter controller controls a beam diameter of the laser beam, and includes an aperture. The aperture controls a beam quality of the laser beam defined by M2 so as to fall in a range of 85?M2?105. The optical fiber guides the controlled laser beam therein. The processing head includes a transfer optical system, and irradiates the guided laser beam to a surface of a workpiece to be processed by way of the transfer optical system.Type: GrantFiled: December 2, 2004Date of Patent: October 27, 2009Assignees: Toyota Jidosha Kabushiki Kaisha, Mitsubishi Denki Kabushiki KaishaInventors: Hironari Mikata, Kazuhisa Mikame, Akio Sato, Kazuki Kuba, Shuichi Fujikawa, Toshiaki Watanabe
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Publication number: 20090141746Abstract: In a solid-state laser device, a single outer casing (1) having an approximately sealed structure is included; a single or a plurality of inner casings (2) are provided inside the outer casing (1); in some or all of the inner casings (2), an air cleaning unit (4) is included in which the air within the outer casing (1) is made clean and supplied into the inner casings (2); inside the outer casing (1), there disposed are a laser light-source (5, 6, 7) having a solid-state laser medium (501) and a light resonator, and an optical system (10, 11, 901) that transmits or interrupts a laser beam (8) emitted from the laser light-source; in addition, the laser light-source (5, 6, 7) and the optical system (10, 11, 901) or part of them are contained inside the inner casings (2); thus, in a simple, compact and inexpensive configuration, it is possible to prevent degradation of optical components and dew condensation thereon, and to stably supply a laser beam.Type: ApplicationFiled: May 19, 2006Publication date: June 4, 2009Applicant: MITSUBISHI ELECTRIC CORPORATIONInventors: Shuichi Fujikawa, Junji Kano, Kazuki Kuba
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Publication number: 20050121427Abstract: A solid-state laser processing apparatus includes a solid-state laser oscillator, a laser beam diameter controller, an optical fiber, and a processing head. The solid-state laser oscillator oscillates a laser beam. The laser beam diameter controller controls a beam diameter of the laser beam, and includes an aperture. The aperture controls a beam quality of the laser beam defined by M2 so as to fall in a range of 85?M2?105. The optical fiber guides the controlled laser beam therein. The processing head includes a transfer optical system, and irradiates the guided laser beam to a surface of a workpiece to be processed by way of the transfer optical system.Type: ApplicationFiled: December 2, 2004Publication date: June 9, 2005Inventors: Hironari Mikata, Kazuhisa Mikame, Akio Sato, Kazuki Kuba, Shuichi Fujikawa, Toshiaki Watanabe
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Patent number: 5815626Abstract: An optical transmission device has an graded index optical fiber having a diameter .phi..sub.s of a core of the optical fiber, a refraction index n.sub.0 at a center of the core, and a difference .DELTA.n between refraction indexes of the center of the core and a peripheral section of the core; and an optical fiber incident system having a smallest focussed point at or near an incident side plane in said optical fiber through which the laser beam being introduced, and a diameter .phi..sub.in Of the laser beam at said incident side plane of said optical fiber having a following relationship: 0.5.phi..sub.s .ltoreq..phi..sub.in .ltoreq.2.phi..sub.s, and .phi..sub.s =(.phi..sub.c .phi..sub.0 .theta.(2n.sub.0 .DELTA.n).sup.-1/2).sup.1/2, where a diameter and an opening angle of the laser beam waist are .phi..sub.0 and 2.theta.. A solid state laser device has an graded index optical fiber in which the diameter .phi..sub.in of the laser beam at the optical fiber side having the following relationship: 0.5.phi..sub.Type: GrantFiled: September 18, 1996Date of Patent: September 29, 1998Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuki Kuba, Akira Ishimori, Koji Yasui, Kenji Kumamoto, Kuniaki Iwashiro
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Patent number: 5557628Abstract: A solid state laser apparatus and a laser machining apparatus are provided to provide high power laser beam having an excellent condensing performance at high efficiency and with high reliability. In the solid state laser apparatus, a recess is provided in a supporter disposed on a slab side surface at an excitation area corresponding portion. A high reflectance body having a cooling water filtrating groove is disposed in the recess to contact with a slab facing surface with pressure. The supporter contacts slab longitudinal both ends with pressure through a silicon rubber plate which is transparent to excitation light. A transparent silicon rubber O-ring is disposed to extend over an entire peripheral portion of a plane formed by a slab surface including the supporter pressure contacting porting and the supporter so as to seal cooling water and elastically support the slab.Type: GrantFiled: April 28, 1994Date of Patent: September 17, 1996Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuki Kuba, Masaki Seguchi, Akira Ishimori, Takashi Yamamoto
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Patent number: 5299213Abstract: A solid state laser apparatus comprises a laser medium having a pair of optically flat surfaces confronting to each other, and side surfaces intersecting the optically flat surfaces along an optical axis, the laser medium having a rectangular cross section; heat insulators adhered to the side surfaces of the laser medium; and reflective films for shielding the thermal insulators from pumping light. A solid state laser apparatus may comprise heat conductors bonded to the side surfaces of the laser medium, the heat conductors removing heat which occurs at bonding surfaces, the amount of removed heat from the side surfaces being smaller than that from the optically flat surfaces.Type: GrantFiled: March 4, 1993Date of Patent: March 29, 1994Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Kazuki Kuba, Takashi Yamamoto, Shigenori Yagi
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Patent number: 5125001Abstract: This invention relates to a solid laser device with a slab-shaped laser medium. One example of a solid laser device according to the invention, comprises: a slab-shaped laser medium having one pair of optically smooth surfaces confronting each other through the optical path; first and second mirrors arranged on the optical path in such a manner that the first and second mirrors are confronted with each other through the laser medium; a resonator which forms an unstable resonator in the direction of width of the laser medium, and a low order stable resonator in the direction of thickness of the laser medium; and laser beam emergence medium for taking a laser beam out of the a resonator and outputting the laser beam from the device.Type: GrantFiled: October 15, 1990Date of Patent: June 23, 1992Assignee: Mitsubishi Denki K.K.Inventors: Shigenori Yagi, Kazuki Kuba, Junichi Nishimae, Takashi Yamamoto
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Patent number: 4924474Abstract: A laser device comprises a laser medium, a semiconductor light-emitting element for exciting the laser medium, a reflecting surface surrounding the outer periphery of the laser medium along its optical axis, and an opening provided in a part of the reflecting surface for causing light from the semiconductor light-emitting element to be incident upon the laser medium. The laser device is improved further by providing a polarizing plate and a light guide between the light-emitting element and the laser medium and by deviating the optical axis of excitation light from the central axis of the laser medium.Type: GrantFiled: February 10, 1989Date of Patent: May 8, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Shigenori Yagi, Yasuhito Myoi, Masaki Kuzumoto, Kazuki Kuba, Yoshito Seiwa, Toshitaka Aoyagi, Yutaka Mihashi
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Patent number: 4903271Abstract: A laser apparatus has a phase regulator for regulating phase of output laser beam is provided, in which a full reflection portion of an output mirror is made partially reflective and a relative optical length thereof to a non-reflection portion of the output mirror is regulated by a relative thickness thereof. In one aspect of the invention, a coating provided on a center portion of an inner surface of an output mirror of a resonator comprises a partially reflective coating and a phase difference between laser beam portions passing through the center portion and a surrounding portion is regulated by a thin membrane having same refraction index as that of a matrix of the output mirror and provided between the matrix and a coating on either surface of the output mirror.Type: GrantFiled: June 3, 1988Date of Patent: February 20, 1990Assignee: Mitsubishi Denki Kabushiki KaishaInventors: Koji Yasui, Masaaki Tanaka, Shigenori Yagi, Masaki Kuzumoto, Yasuhito Myoi, Kazuki Kuba