Patents by Inventor Takahiko Nishiyama

Takahiko Nishiyama 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: 10788660
    Abstract: An optical scanning device includes an optical scanner including a mirror that includes a light reflection surface, a driving source that causes the mirror to rotate around a rotation axis passing through the center of the light reflection surface in response to a driving signal, and a piezoelectric sensor that outputs a sensor signal corresponding to a rotational angle of the mirror around the rotation axis; and an impedance conversion circuit that receives the sensor signal from the piezoelectric sensor, performs impedance conversion on the received sensor signal, and outputs the impedance-converted sensor signal.
    Type: Grant
    Filed: August 29, 2018
    Date of Patent: September 29, 2020
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yoichi Sakaue, Takahiko Nishiyama
  • Publication number: 20190072757
    Abstract: An optical scanning device includes an optical scanner including a mirror that includes a light reflection surface, a driving source that causes the mirror to rotate around a rotation axis passing through the center of the light reflection surface in response to a driving signal, and a piezoelectric sensor that outputs a sensor signal corresponding to a rotational angle of the mirror around the rotation axis; and an impedance conversion circuit that receives the sensor signal from the piezoelectric sensor, performs impedance conversion on the received sensor signal, and outputs the impedance-converted sensor signal.
    Type: Application
    Filed: August 29, 2018
    Publication date: March 7, 2019
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Yoichi SAKAUE, Takahiko NISHIYAMA
  • Patent number: 9268132
    Abstract: An optical scanning device includes a mirror part including a mirror reflecting surface to reflect incident light, a pair of torsion bars configured to support the mirror part from both sides and configured to form a first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light, and at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars. The alleviation area is provided between an intersection of a second axis perpendicular to the first axis and passing through the center of the mirror reflecting surface and an edge of the mirror reflecting surface, and at least one of the torsion bars.
    Type: Grant
    Filed: December 17, 2014
    Date of Patent: February 23, 2016
    Assignee: MITSUMI ELECTRIC CO., LTD.
    Inventors: Toyoki Tanaka, Tsukasa Yamada, Takahiko Nishiyama
  • Publication number: 20150103386
    Abstract: An optical scanning device includes a mirror part including a mirror reflecting surface to reflect incident light, a pair of torsion bars configured to support the mirror part from both sides and configured to form a first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light, and at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars. The alleviation area is provided between an intersection of a second axis perpendicular to the first axis and passing through the center of the mirror reflecting surface and an edge of the mirror reflecting surface, and at least one of the torsion bars.
    Type: Application
    Filed: December 17, 2014
    Publication date: April 16, 2015
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Toyoki TANAKA, Tsukasa YAMADA, Takahiko NISHIYAMA
  • Patent number: 8941906
    Abstract: An optical scanning device includes a mirror part including a mirror reflecting surface to reflect incident light, a pair of torsion bars configured to support the mirror part from both sides and configured to forma first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light, and at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars. The alleviation area is provided between an intersection of a second axis perpendicular to the first axis and passing through the center of the mirror reflecting surface and an edge of the mirror reflecting surface, and at least one of the torsion bars.
    Type: Grant
    Filed: October 1, 2012
    Date of Patent: January 27, 2015
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Toyoki Tanaka, Tsukasa Yamada, Takahiko Nishiyama
  • Publication number: 20130083379
    Abstract: An optical scanning device includes a mirror part including a mirror reflecting surface to reflect incident light, a pair of torsion bars configured to support the mirror part from both sides and configured to forma first axis around which to swing the mirror part by a torsional motion thereof so as to deflect the reflected light, and at least one stress alleviation area configured to alleviate a stress generated by the torsional motion of the torsion bars. The alleviation area is provided between an intersection of a second axis perpendicular to the first axis and passing through the center of the mirror reflecting surface and an edge of the mirror reflecting surface, and at least one of the torsion bars.
    Type: Application
    Filed: October 1, 2012
    Publication date: April 4, 2013
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Toyoki TANAKA, Tsukasa Yamada, Takahiko Nishiyama
  • Publication number: 20120160557
    Abstract: A structure including: a first part including an electrode pad in a predetermined area on a surface; a second part that is bonded to the first part using an adhesive; and a board, including a terminal pad, to which the second part is fixed, wherein the electrode pad and the terminal pad are ultrasonic-bonded, and the second part includes bosses on an area that overlaps the predetermined area in a bonding surface between the second part and the first part.
    Type: Application
    Filed: December 21, 2011
    Publication date: June 28, 2012
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Tsukasa YAMADA, Takahiko NISHIYAMA, Toyoki TANAKA
  • Publication number: 20120081771
    Abstract: An optical scanning apparatus includes: a light source; a lens through which a light emitted from the light source transmits; a reflective member reflecting the light transmitting the lens; and a mirror configured to scan the light reflected by the reflective member. The light is projected in the same direction as an emitting direction of the light from said light source by causing said mirror to swing. The reflective member has a first reflective surface facing toward the light source and a second reflective surface facing toward a light exit surface from which the light exits from the optical scanning apparatus. The light source and the lens are arranged in a longitudinal direction of a case of the optical scanning apparatus. The mirror and the reflective member are arranged in a transverse direction of the case.
    Type: Application
    Filed: September 22, 2011
    Publication date: April 5, 2012
    Applicant: MITSUMI ELECTRONICS CO., LTD.
    Inventors: Toyoki TANAKA, Takahiko Nishiyama
  • Patent number: 7956513
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The moving portion is driven by equalizing a constant expanding speed of the electro-mechanical transducer with a constant contracting speed of the electro-mechanical transducer and by setting a constant rest time interval after one of contraction of the electro-mechanical transducer and expansion of the electro-mechanical transducer.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: June 7, 2011
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Toyoki Tanaka, Soumei Takahashi, Takahiko Nishiyama
  • Patent number: 7755252
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The stationary member consists essentially of a base alloy which consists of, by weight, 88 to 97% tungsten, 2 to 11% nickel as a binder, and, as the balance, 0.1 to 2% at least one metal having an ionization tendency which is higher than that of tungsten. The stationary member has a surface without nickel plating.
    Type: Grant
    Filed: April 17, 2008
    Date of Patent: July 13, 2010
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Tsukasa Yamada, Toyoki Tanaka, Takahiko Nishiyama, Soumei Takahashi
  • Patent number: 7652407
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a static member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. An outer sheath is for covering the driving device. An attitude retaining arrangement retains an attitude of the driving device with respect to the outer sheath.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: January 26, 2010
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Takahiko Nishiyama, Tsukasa Yamada
  • Patent number: 7633208
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The vibration friction portion is made of a material having a vibration transfer rate of 4900 meters/second or more. The moving portion is made of a material which has a vibration transfer rate of 4900 meters/second or more and which is different from that of the vibration friction portion.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: December 15, 2009
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Tsukasa Yamada, Takahiko Nishiyama, Soumei Takahashi, Toyoki Tanaka
  • Patent number: 7633209
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a static member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The driving device is covered with a cabinet. An elastic member lies between the cabinet and the static member.
    Type: Grant
    Filed: April 15, 2008
    Date of Patent: December 15, 2009
    Assignee: Mitsumi Electric Co., Ltd.
    Inventors: Soumei Takahashi, Takahiko Nishiyama
  • Publication number: 20090268581
    Abstract: An optical pickup in which constituting components are arranged so that a dead space can be reduced and aberrations can also be reduced at a low manufacturing cost is provided. In an outward path for projecting a laser beam onto a recording surface 12 of an optical disc 11, the laser beam emitted from a laser diode 2 is reflected on a polarization mirror 3, polarized by a quarter wavelength plate 4, and then passed through an objective lens 5 so that the laser beam is focused on the recording surface 12 of the optical disc 11. In a returning path for receiving the laser beam reflected on the recording surface 12, the laser beam reflected on the recording surface 12 and passed through the objective lens 5 is polarized by the quarter wavelength plate 4, transmitted through the polarization mirror 3, reflected on a total reflective film 61 of the quarter wavelength plate 6, and then reflected on the polarization mirror 3 so that the laser beam is received by a photodiode 7.
    Type: Application
    Filed: June 30, 2006
    Publication date: October 29, 2009
    Applicant: MITSUMI ELECTRIC CO., LTD.
    Inventors: Toyoki Tanaka, Takahiko Nishiyama
  • Publication number: 20080297004
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The vibration friction portion is made of a material having a vibration transfer rate of 4900 meters/second or more. The moving portion is made of a material which has a vibration transfer rate of 4900 meters/second or more and which is different from that of the vibration friction portion.
    Type: Application
    Filed: April 15, 2008
    Publication date: December 4, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Tsukasa Yamada, Takahiko Nishiyama, Soumei Takahashi, Toyoki Tanaka
  • Publication number: 20080297000
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a static member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. An outer sheath is for covering the driving device. An attitude retaining arrangement retains an attitude of the driving device with respect to the outer sheath.
    Type: Application
    Filed: April 15, 2008
    Publication date: December 4, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Takahiko Nishiyama, Tsukasa Yamada
  • Publication number: 20080265806
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The moving portion is driven by equalizing a constant expanding speed of the electro-mechanical transducer with a constant contracting speed of the electro-mechanical transducer and by setting a constant rest time interval after one of contraction of the electro-mechanical transducer and expansion of the electro-mechanical transducer.
    Type: Application
    Filed: April 17, 2008
    Publication date: October 30, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Toyoki Tanaka, Soumei Takahashi, Takahiko Nishiyama
  • Publication number: 20080257083
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a stationary member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion mounted to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The stationary member consists essentially of a base alloy which consists of, by weight, 88 to 97% tungsten, 2 to 11% nickel as a binder, and, as the balance, 0.1 to 2% at least one metal having an ionization tendency which is higher than that of tungsten. The stationary member has a surface without nickel plating.
    Type: Application
    Filed: April 17, 2008
    Publication date: October 23, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Tsukasa Yamada, Toyoki Tanaka, Takahiko Nishiyama, Soumei Takahashi
  • Publication number: 20080258578
    Abstract: A driving device includes an electro-mechanical transducer having first and second end portions opposite to each other in an expansion/contraction direction, a static member coupled to the first end portion of the electro-mechanical transducer, a vibration friction portion coupled to the second end portion of the electro-mechanical transducer, and a rod-shaped moving portion frictionally coupled to the vibration friction portion, whereby moving the moving portion in the expansion/contraction direction of the electro-mechanical transducer. The driving device is covered with a cabinet. An elastic member lies between the cabinet and the static member.
    Type: Application
    Filed: April 15, 2008
    Publication date: October 23, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Soumei Takahashi, Takahiko Nishiyama
  • Publication number: 20080236729
    Abstract: A laminated piezoelectric element includes plural internal electrodes which are laminated and has a dead area at outer regions thereof. The laminated piezoelectric element has first and second end surfaces in an expansion direction thereof. On bonding a first bonded surface of a piezoelectric element fixing portion to the first end surface, a bonding method includes forming a first ring-shaped adhesive accumulation in the first bonded surface, accumulating an elastic adhesive agent in the first ring-shaped adhesive accumulation, and bonding the first end surface to the first bonded surface.
    Type: Application
    Filed: March 26, 2008
    Publication date: October 2, 2008
    Applicant: Mitsumi Electric Co. Ltd.
    Inventors: Tsukasa Yamada, Takahiko Nishiyama, Toyoki Tanaka