Patents by Inventor Tadashi Takeda

Tadashi Takeda 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: 20110262121
    Abstract: An optical unit with shake correcting function may include a movable module on which an optical element is mounted, a fixed body which supports the movable module, a shake detection sensor which detects a shake of the movable module, a shake correction magnetic drive mechanism which swings the movable module on the fixed body on a basis of a detection result of the shake detection sensor to correct the shake of the movable module, and a spring member which is connected with the fixed body and the movable module. A stopper mechanism may be structured between the movable module and the fixed body, and the stopper mechanism may moving ranges of the movable module due to the shake.
    Type: Application
    Filed: October 2, 2009
    Publication date: October 27, 2011
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Katsushige Yanagisawa, Hisahiro Ishihara, Shinji Minamisawa, Yuichi Takei, Tadashi Takeda, Toshiyuki Karasawa, Akihiro Nagata, Kiyoshi Miyazaki
  • Publication number: 20110262122
    Abstract: An imaging optical device may include a movable module having a lens drive device on which a lens and an imaging element are mounted; a support body for supporting the movable module; a rocking drive mechanism for rocking the movable module; and a plate spring for rockably supporting the movable module. The plate spring is provided with a holding section for holding the movable module, a fixed section fixed to the support body, and a spring section for connecting the holding section and the fixed section to each other. The spring section can deform in the direction perpendicular to the optical axis and in the direction of the optical axis.
    Type: Application
    Filed: October 8, 2009
    Publication date: October 27, 2011
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Shinji Minamisawa, Toshiyuki Karasawa, Yuichi Takei, Tadashi Takeda, Akihiro Nagata, Hisahiro Ishihara, Kiyoshi Miyazaki, Katsushige Yanagisawa
  • Patent number: 7986873
    Abstract: An optical unit with shake correcting function may include a movable module on which at least an optical element is mounted, a fixed body which supports the movable module, a shake detection sensor which detects a shake of the movable module, a drive mechanism for shake correction for swinging the movable module on the fixed body on the basis of a detection result of the shake detection sensor to correct the shake of the movable module, and a control section which controls the drive mechanism for shake correction on the basis of the detection result of the shake detection sensor. The shake detection sensor is a gyroscope mounted on the movable module and the control section controls the drive mechanism for shake correction so as to cancel the shake detected by the gyroscope.
    Type: Grant
    Filed: October 20, 2009
    Date of Patent: July 26, 2011
    Assignee: Nidec Sankyo Corporation
    Inventors: Hisahiro Ishihara, Toshiyuki Karasawa, Shinji Minamisawa, Yuichi Takei, Tadashi Takeda, Katsushige Yanagisawa, Akihiro Nagata, Kiyoshi Miyazaki
  • Publication number: 20110103782
    Abstract: Provided is a photographing optical device, which is able to reliably correct an unintentional movement by hand of a user by improving the constitution of a camera unit driving mechanism for correcting the deflection of a camera unit. In order that a camera unit is made to be rocked to correct the unintentional movement, a photographing optical device includes a first camera unit drive mechanism and a second camera unit drive mechanism, which are so disposed at two side portions sandwiching a pivot portion therebetween as to make a pair. In these camera unit drive mechanisms, camera unit driving magnets are held on the side of the camera unit as a movable body side, and camera unit driving coils are held on the side of a stationary body. The camera unit is pushed toward the pivot portion by a gimbal spring, which is provided with a plurality of arm portions extending mutually in the same circumferential direction.
    Type: Application
    Filed: November 1, 2010
    Publication date: May 5, 2011
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Toshifumi TSURUTA, Kiyoshi MIYAZAKI, Tadashi TAKEDA, Hisahiro ISHIHARA, Katsushige YANAGISAWA, Toshiyuki KARASAWA, Yuichi TAKEI, Akihiro NAGATA, Shinji MINAMISAWA
  • Publication number: 20110097062
    Abstract: Provided is an optical imaging device which improves the structure of an imaging unit drive mechanism for vibration correction in an imaging unit and can reliably correct the vibrations. An optical imaging device, wherein an imaging unit is displaced to correct the vibrations, and the imaging unit is supported on a stationary object by a total of four suspension wires. A first imaging unit drive mechanism and a second imaging unit drive mechanism are provided as a pair at two positions on either side of the optical axis L. In the imaging unit drive mechanisms, imaging unit drive magnets, are held on the imaging unit side, which is the movable side, and imaging unit drive coils, are held on the stationary object side.
    Type: Application
    Filed: October 28, 2010
    Publication date: April 28, 2011
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Toshifumi TSURUTA, Kiyoshi MIYAZAKI, Tadashi TAKEDA, Hisahiro ISHIHARA, Katsushige YANAGISAWA, Toshiyuki KARASAWA, Yuichi TAKEI, Akihiro NAGATA, Shinji MINAMISAWA
  • Publication number: 20100098394
    Abstract: An optical unit with shake correcting function may include a movable module on which at least an optical element is mounted, a fixed body which supports the movable module, a shake detection sensor which detects a shake of the movable module, a drive mechanism for shake correction for swinging the movable module on the fixed body on the basis of a detection result of the shake detection sensor to correct the shake of the movable module, and a control section which controls the drive mechanism for shake correction on the basis of the detection result of the shake detection sensor. The shake detection sensor is a gyroscope mounted on the movable module and the control section controls the drive mechanism for shake correction so as to cancel the shake detected by the gyroscope.
    Type: Application
    Filed: October 20, 2009
    Publication date: April 22, 2010
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Hisahiro ISHIHARA, Toshiyuki KARASAWA, Shinji MINAMISAWA, Yuichi TAKEI, Tadashi TAKEDA, Katsushige YANAGISAWA, Akihiro NAGATA, Kiyoshi MIYAZAKI
  • Publication number: 20100091120
    Abstract: An optical unit with shake correcting function may include a movable module having a lens, a fixed body supporting the movable module, a shake detection sensor for detecting shake of the movable module, and at least one pair of magnetic drive mechanism for shake correction which is structured on both sides of the movable module so that the movable module is swung with respect to the fixed body on the basis of detection result of the shake detection sensor to correct the shake of the movable module. The magnetic drive mechanism for shake correction is disposed so that a shake correction magnet is held by the fixed body and a shake correction coil is held by the movable module.
    Type: Application
    Filed: October 14, 2009
    Publication date: April 15, 2010
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Akihiro NAGATA, Toshiyuki KARASAWA, Yuichi TAKEI, Tadashi TAKEDA, Hisahiro ISHIHARA, Shinji MINAMISAWA, Katsushige YANAGISAWA, Kiyoshi MIYAZAKI
  • Publication number: 20080297778
    Abstract: An optical axis adjusting device for adjusting an optical axis in an optical head device may include a rotatable part which is turnably mounted on a main base so that the optical head device is capable of being turned with an axis X which is set to be at a spot position of one of the return light beams of the two laser beams. The optical axis adjusting device may include a correcting means for converting an optical axis shift on the light receiving face when the other laser beam is emitted to a non-corresponding optical medium, into an optical axis shift on the light receiving face when the other laser beam is emitted to the other corresponding optical medium.
    Type: Application
    Filed: May 27, 2008
    Publication date: December 4, 2008
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Yuichi Takei, Tadashi Takeda, Katsuyoshi Miyasaka
  • Publication number: 20080239929
    Abstract: An optical head device may include a first laser light source, a second laser light source, a first parallel-plate type beam splitter for guiding a first and a second laser beams to a common objective lens, a second parallel-plate type beam splitter for guiding the second laser beam to the common objective lens, an aberration correction lens disposed between the first laser light source and the first beam splitter for correcting an aberration generated when the first laser beam transmits through the first beam splitter; and a light source unit which is structured by fixing the first laser light source and the aberration correction lens to a common holder in a state that a relative position between the first laser light source and the aberration correction lens is previously set.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 2, 2008
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Masaki Sasaki, Izumi Komatsu, Tadashi Takeda
  • Publication number: 20080239927
    Abstract: An optical head device may include a polarization conversion element disposed on a common optical path for guiding a first and a second laser beams to a common objective lens for converting the first and the second laser beams to a circularly polarized light from a linearly polarized light, and a ½-wavelength plate disposed on an optical path of the first laser beam from a first laser light source to the common optical path for adjusting a polarization plane direction of the first laser beam. A polarization plane direction of the first laser beam incident on the polarization conversion element from the first laser light source is adjusted by the ½-wavelength plate in a direction so that the linearly polarized light is converted into the circularly polarized light.
    Type: Application
    Filed: March 31, 2008
    Publication date: October 2, 2008
    Applicant: NIDEC SANKYO CORPORATION
    Inventors: Masaki Sasaki, Izumi Komatsu, Tadashi Takeda
  • Patent number: 6961297
    Abstract: The present invention provides for a optical head device having a beam-guiding optical device to bring beams of different wavelengths which are emitted by separate light sources together onto the same optical axis or to guide the beams onto a common photo receiving device. The beam-guiding optical device includes an incident plane and an exit plane and the incident plane and the exit plane are back to back. One of the incident plane and the exit plane has a stair-like surface wherein a step height between neighboring treads in the stair-like surface is set to cause a phase difference of n wavelength to one of the beams passing through the neighboring treads and n is equal to 1, 2, 3 . . . .
    Type: Grant
    Filed: July 6, 2001
    Date of Patent: November 1, 2005
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventor: Tadashi Takeda
  • Patent number: 6815477
    Abstract: The purpose of the present invention is to provide a flame-retardant polyamide resin composition which neither causes environment pollution nor liberates toxic combustion gases, exhibits good flame-retardancy even if an inorganic filler is compounded with the polyamide-based resin, and hardly stains the mold during molding. Provision of a flame-retardant polyamide resin composition comprising (A) 20 to 89 wt.-% of a polyamide-base resin consisting of a polyamide resin obtained from xylylene diamine and an &agr;,&ohgr;-straight-chain aliphatic dibasic acid, (B) 1 to 30 wt.-% of a salt of polyphosphoric acid and melamine, and (C) 10 to 50 wt.-% of inorganic filler; and of electrical parts employing the composition.
    Type: Grant
    Filed: August 29, 2002
    Date of Patent: November 9, 2004
    Assignee: EC-Showa Denko K.K.
    Inventors: Toshihiro Arai, Tadashi Takeda, Katsuo Kobori, Osamu Hamazoe
  • Patent number: 6775065
    Abstract: In a diffraction element, a diffraction grating is formed with a grating pitch having different diffraction angles in accordance with a wavelength of a laser light beam incident thereon. The wavelength is variable in accordance with an environment temperature. The diffraction element is made of a material having a linear expansion coefficient which causes thermal variation in the grating pitch enough to compensate at least a part of the diffraction angle variation due to environment temperature change.
    Type: Grant
    Filed: October 5, 2001
    Date of Patent: August 10, 2004
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Kenichi Hayashi, Tadashi Takeda
  • Patent number: 6633530
    Abstract: An optical pickup apparatus has a light source unit that includes a first light source and a common light-receiving device having first and second light-receiving sections. The optical pickup apparatus further includes an optical path composition element that guides first light emitted from the first light source and second light emitted from another light source into an optical path that passes an objective lens, and an optical path polarization element that guides reflected lights of the first and the second lights to the common light-receiving device. The optical path polarization element is mounted in the light source unit for guiding reflected lights of the first and second lights to the common light-receiving device.
    Type: Grant
    Filed: August 30, 2000
    Date of Patent: October 14, 2003
    Assignee: Sankyo Seiki Mfg. Co., Ltd.
    Inventor: Tadashi Takeda
  • Patent number: 6577564
    Abstract: An optical pickup device includes a semiconductor laser for emitting forward and backward laser light from front and back emergent end faces thereof, focusing device for focusing the forward laser light emergent from the front emergent end face of said semiconductor laser onto an optical recording medium, a light-receiving element for signal reproduction for detecting return light from the optical recording medium, and a light-guiding system for guiding the return light to said light-receiving element for signal reproduction, said optical pickup device being provided with a light source unit having an arrangement in which said semiconductor laser and said light-receiving element for signal reproduction being incorporated in a common package and shielding device, disposed inside said package of said light source unit, for preventing the light emitted from said semiconductor laser from being incident upon said light-receiving element for signal reproduction.
    Type: Grant
    Filed: July 15, 2002
    Date of Patent: June 10, 2003
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Tadashi Takeda, Hisahiro Ishihara, Yoshio Hayashi, Taminori Masuzawa, Yuichi Takei
  • Patent number: 6552317
    Abstract: A phase difference plate (12) converts states of polarization of emergent light form a laser light source (13) and return light form an optical recording medium (5). A diffractive element (21) separates the return light from an optical axis leading from the laser light source (13) to the optical recording medium (5), and guides the return light to a photodetector (14) on the basis of a difference between the states of polarization of the emergent light and the return light. The polarization direction of emergent light from the laser light source (13) is arranged so as to be oriented in the radial direction of the optical recording medium (5) (in the direction of birefringence of the optical recording medium).
    Type: Grant
    Filed: June 13, 2000
    Date of Patent: April 22, 2003
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventors: Tadashi Takeda, Yuichi Takei, Yoshio Hayashi
  • Publication number: 20020196726
    Abstract: An optical pickup device is equipped with a first light source that emits a first laser beam, a second light source that emits a second laser beam having a wavelength shorter than a wavelength of the first laser beam, and a common light path that conducts the first laser beam and the second laser beam emitted from the respective light sources to an optical recording medium. The optical pick up device includes a first diffraction grating and a second diffraction grating disposed on the common light path arranged in this order from the first and second light sources. The first diffraction grating diffracts the first laser beam and generates three beams for detecting tracking error, and transmits the second laser beam without diffracting the second laser beam, and the second diffraction grating diffracts the second laser beam and generates three beams for detecting tracking error, and transmits the first laser beam without diffracting the first laser beam.
    Type: Application
    Filed: June 18, 2002
    Publication date: December 26, 2002
    Inventor: Tadashi Takeda
  • Publication number: 20020181373
    Abstract: An optical pickup device includes a semiconductor laser for emitting forward and backward laser light from front and back emergent end faces thereof, focusing device for focusing the forward laser light emergent from the front emergent end face of said semiconductor laser onto an optical recording medium, a light-receiving element for signal reproduction for detecting return light from the optical recording medium, and a light-guiding system for guiding the return light to said light-receiving element for signal reproduction, said optical pickup device being provided with a light source unit having an arrangement in which said semiconductor laser and said light-receiving element for signal reproduction being incorporated in a common package and shielding device, disposed inside said package of said light source unit, for preventing the light emitted from said semiconductor laser from being incident upon said light-receiving element for signal reproduction.
    Type: Application
    Filed: July 15, 2002
    Publication date: December 5, 2002
    Applicant: KABUSHIKI KAISHA SANKYO SEIKI SEISAKUSHO
    Inventors: Tadashi Takeda, Hisahiro Ishihara, Yoshio Hayashi, Taminori Masuzawa, Yuichi Takei
  • Patent number: 6489599
    Abstract: In an optical pickup device, a first light source and a second light source, light emission points of which are not on an identical optical axis, are provided. A first laser light beam and a second laser light beam, wavelengths of which are different from each other, are respectively emitted from the first and second light sources. The first and second laser light-beams reflected from an optical recording medium are diffracted based on different diffraction order, such that the diffracted first and second laser light beams are received by a common light receiving element.
    Type: Grant
    Filed: March 12, 2001
    Date of Patent: December 3, 2002
    Assignee: Kabushiki Kaisha Sankyo Seiki Seisakusho
    Inventor: Tadashi Takeda
  • Patent number: D477246
    Type: Grant
    Filed: April 18, 2000
    Date of Patent: July 15, 2003
    Assignee: Takeda Seiki Co., Ltd.
    Inventor: Tadashi Takeda