Patents by Inventor Taizo Nakamura

Taizo Nakamura 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: 8658964
    Abstract: A photoelectric encoder in which light emitted from a light source is modulated by an optical grating and the modulated light is detected by a light receiving element, includes a one-side telecentric optical system which forms an image of the light modulated by the optical grating. The imaging optical system has an aperture through which part of the light modulated by the optical grating is allowed to transmit, the aperture having a size which is required when a cutoff spatial frequency that is a spatial frequency indicating a resolution limit of the imaging optical system due to the light emitted from the light source has a value between a fundamental spatial frequency of the optical grating obtained by a Fourier transformation and a second harmonic of the fundamental spatial frequency.
    Type: Grant
    Filed: October 21, 2010
    Date of Patent: February 25, 2014
    Assignee: Mitutoyo Corporation
    Inventors: Emi Kaneko, Taizo Nakamura, Tatsuya Nagahama, Atsushi Usami
  • Publication number: 20110095171
    Abstract: A photoelectric encoder in which light emitted from a light source is modulated by an optical grating and the modulated light is detected by a light receiving element, includes a one-side telecentric optical system which forms an image of the light modulated by the optical grating. The imaging optical system has an aperture through which part of the light modulated by the optical grating is allowed to transmit, the aperture having a size which is required when a cutoff spatial frequency that is a spatial frequency indicating a resolution limit of the imaging optical system due to the light emitted from the light source has a value between a fundamental spatial frequency of the optical grating obtained by a Fourier transformation and a second harmonic of the fundamental spatial frequency.
    Type: Application
    Filed: October 21, 2010
    Publication date: April 28, 2011
    Applicant: MITUTOYO CORPORATION
    Inventors: Emi KANEKO, Taizo NAKAMURA, Tatsuya NAGAHAMA, Atsushi USAMI
  • Publication number: 20090084884
    Abstract: A wheelchair fixing apparatus (2) according to the present invention includes belts (21) having connecting members (23) which can be attached to and detached from fixing hardware pieces (3) installed on a floor and winding devices (22) for winding up and accommodating the belts (21) and the winding devices (22) are disposed on the wheelchair (1). Therefore, the fixing hardware pieces (3) to which the belts (21) are connected through the connecting members (23) suffice as the floor-side equipment. Moreover, with this apparatus, a user of the wheelchair can perform the fixing operation by himself/herself. Even when a caretaker performs the operation, the burden on the caretaker in performing the operation can be reduced. Furthermore, the apparatus need not be carried by the caretaker, nor need it be ready in advance in a place where the wheelchair (1) is to be fixed.
    Type: Application
    Filed: October 1, 2007
    Publication date: April 2, 2009
    Applicants: ANCRA JAPAN LTD., Tohoku University
    Inventors: Taizo Nakamura, Masaru Uchiyama, Atsushi Konno, Daisuke Sato, Koyu Abe
  • Patent number: 7298863
    Abstract: An in-vehicle speaker rotational mounting structure including a speaker unit having a claw portion provided thereon, and a panel member on which the speaker unit is mounted, wherein the claw portion is inserted into a slit formed in the panel member, so that the speaker unit is mounted on the panel member by being rotated in a circumferential direction. A jig inserting hole is provided in the speaker unit.
    Type: Grant
    Filed: June 16, 2003
    Date of Patent: November 20, 2007
    Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki Kaisha
    Inventors: Karebu Kirihara, Taizo Nakamura
  • Patent number: 7177438
    Abstract: The present invention relates to a speaker for a vehicle and an installation structure therefor, and it is an object of the invention to enhance the speaker installation rigidity without impairing the acoustic characteristic of the speaker. The speaker installation structure comprises a speaker unit (1) for holding a speaker body (11) and having a plurality of claws (13) and a panel member (3) having an opening (4) and a plurality of slits (5). For the installation of the speaker unit (1), the plurality of claws (13) are inserted into the plurality of slits (5), respectively, and the speaker unit (1) is rotated in its circumferential direction. The opening (4) is made to be smaller than the diameter of a speaker housing (12) and to have at least three linear portions (41). Each of the slits (5) is formed outside the three linear portions (41) and inside an outer circumference of the speaker housing (12).
    Type: Grant
    Filed: October 31, 2002
    Date of Patent: February 13, 2007
    Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki Kaisha
    Inventors: Shogo Iwaya, Sukeyoshi Nakashima, Taizo Nakamura, Karebu Kirihara
  • Publication number: 20040247150
    Abstract: The present invention relates to a speaker for a vehicle and an installation structure therefor, and it is an object of the invention to enhance the speaker installation rigidity without impairing the acoustic characteristic of the speaker. The speaker installation structure comprises a speaker unit (1) for holding a speaker body (11) and having a plurality of claws (13) and a panel member (3) having an opening (4) and a plurality of slits (5). For the installation of the speaker unit (1), the plurality of claws (13) are inserted into the plurality of slits (5), respectively, and the speaker unit (1) is rotated in its circumferential direction. The opening (4) is made to be smaller than the diameter of a speaker housing (12) and to have at least three linear portions (41). Each of the slits (5) is formed outside the three linear portions (41) and inside an outer circumference of the speaker housing (12).
    Type: Application
    Filed: October 14, 2003
    Publication date: December 9, 2004
    Inventors: Shogo Iwaya, Sukeyoshi Nakashima, Taizo Nakamura, Karebu Kirihara
  • Publication number: 20040037445
    Abstract: An in-vehicle speaker rotational mounting structure including a speaker unit having a claw portion provided thereon, and a panel member on which the speaker unit is mounted, wherein the claw portion is inserted into a slit formed in the panel member, so that the speaker unit is mounted on the panel member by being rotated in a circumferential direction. A jig inserting hole is provided in the speaker unit.
    Type: Application
    Filed: June 16, 2003
    Publication date: February 26, 2004
    Applicants: MITSUBISHI JIDOSHA KOGYO KABUSHIKI KAISHA, MITSUBISHI JIDOSHA ENGINEERING KABUSHIKI KAISHA
    Inventors: Karebu Kirihara, Taizo Nakamura
  • Patent number: 6646748
    Abstract: To provide a surface profile measurement apparatus capable of efficient measurement of the surface profile of an object. A diamond indenter (16) is movably mounted. The tip end of the diamond indenter (16) is irradiated by light, and the light reflected by the tip end (17) is condensed through a lens (46). The condensed light is observed by a photo sensor (42) for measurement of the curvature radius of the tip end (17). Meanwhile, the light reflected by the tip end (17) and the light reflected by a reference body (66) together cause an interference fringe. The interference fringe is observed by a CCD camera (44) to measure the surface profile of tip end (17).
    Type: Grant
    Filed: August 6, 2001
    Date of Patent: November 11, 2003
    Assignee: Mitutoyo Corporation
    Inventors: Taizo Nakamura, Yoshio Saruki, Tatsuya Narumi, Yasushi Fukumoto
  • Patent number: 6407800
    Abstract: A focus detection unit being applicable to various workpiece and capable of reducing production cost and an optical measuring instrument having the focus detection unit are provided. The focus detection unit is for forming image of first focusing pattern and second focusing pattern onto an image surface of an optical system, projecting the image onto the workpiece, and adjusting relative position of the first focusing pattern and the second focusing pattern for focusing, the focus detection unit including: a slide plate having a plurality of pair of the first focusing pattern and the second focusing pattern; a switching member for switching the slide plate to project the image of either one of the first focusing patterns and the second pattern corresponding thereto onto the workpiece; and a projector for projecting the image of the focusing patterns switched by the switching member onto the workpiece.
    Type: Grant
    Filed: February 25, 2000
    Date of Patent: June 18, 2002
    Assignee: Mitutoyo Corporation
    Inventors: Seiji Shimokawa, Kenji Okabe, Taizo Nakamura
  • Publication number: 20020018215
    Abstract: To provide a surface profile measurement apparatus capable of efficient measurement of the surface profile of an object. A diamond indenter (16) is movably mounted. The tip end of the diamond indenter (16) is irradiated by light, and the light reflected by the tip end (17) is condensed through a lens (46). The condensed light is observed by a photo sensor (42) for measurement of the curvature radius of the tip end (17). Meanwhile, the light reflected by the tip end (17) and the light reflected by a reference body (66) together cause an interference fringe. The interference fringe is observed by a CCD camera (44) to measure the surface profile of tip end (17).
    Type: Application
    Filed: August 6, 2001
    Publication date: February 14, 2002
    Applicant: Mitutoyo Corporation
    Inventors: Taizo Nakamura, Yoshio Saruki, Tatsuya Narumi, Yasushi Fukumoto
  • Patent number: 6147758
    Abstract: A projection measuring instrument requiring no exchange work of overlay chart for comparatively observing a workpiece image and a template is provided. For the object, a table (56) for a workpiece (55) to be put on, an observation optical system having a screen (1) and a projection lens (53) for projecting an image of the workpiece (55) onto the screen (1), a relative movement unit (57) for relatively moving the table (56) and the observation optical system, and a displacement sensor (61) for detecting relative movement displacement by the relative movement unit (57) are provided, the screen (1) being a liquid crystal display, the liquid crystal display having a display controller (2) for displaying a line drawing for measuring a profile of the workpiece (55) onto the liquid crystal display at a predetermined magnification.
    Type: Grant
    Filed: January 24, 2000
    Date of Patent: November 14, 2000
    Assignee: Mitutoyo Corporation
    Inventors: Kenji Okabe, Hiroshi Watabe, Taizo Nakamura
  • Patent number: 6128394
    Abstract: In order to reduce the possibility of moisture, which has seeped into a door from its lower side, contacting with a speaker and also of air pressure building up behind the speaker and hindering the movement of the diaphragm, a waterproof cover 3 is provided which includes a magnet cover 31 which follows the circumference of a magnet 16, a frame cover 32 which partially overlaps with the magnet cover 31 and follows the circumference of the frame 15 when it is combined with a speaker 2, a first aperture 33 placed between the magnet 16 and the magnet cover 31 and a second aperture 34 placed between the magnet cover 31 and the frame cover 32.
    Type: Grant
    Filed: October 22, 1998
    Date of Patent: October 3, 2000
    Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Denki Kabushki Kaisha
    Inventors: Fujio Hayakawa, Jun Yoshida, Ikuo Saga, Taizo Nakamura
  • Patent number: 5963366
    Abstract: A focus detection unit including an optical system employing an image sandwiching method is disclosed. In the focus detection unit, a double slit mask (12) forming double sight lines is disposed on the optical axis of a lamp 10 while a single slit mask (16) forming an single sight line is disposed on the optical axis of a lamp (14). A triangular pole prism 18 is provided, consisting of first and second side surfaces, which together constitutes an edge, and a plane opposing the edge. The prism (18) is disposed such that the double and single sight line are able to irradiate the first and second side surfaces. The prism reflects the incoming lines toward a plane before the right-angle edge. Before the edge of the prism (18), a projection lens (20) is provided for forming images of the double and single sight lines which have been reflected by the prism (18) and separated by a mask (22), at a both aiming line imaging position 100. The images are projected onto a workpiece.
    Type: Grant
    Filed: November 6, 1997
    Date of Patent: October 5, 1999
    Assignee: Mitutoyo Corporation
    Inventors: Taizo Nakamura, Yasushi Fukumoto, Yuwu Zhang
  • Patent number: 5909284
    Abstract: A light beam from a light source is formed into an annular beam and an inner wall of a hole in an object is illuminated with the annular beam.
    Type: Grant
    Filed: April 15, 1998
    Date of Patent: June 1, 1999
    Assignee: Mitutoyo Corporation
    Inventor: Taizo Nakamura
  • Patent number: 5838809
    Abstract: A tinsel cord support member 30 is formed on a gasket 24, two grooves for supporting tinsel cords 26 and conducting them from a tip end portion of the tinsel cord support member 30 up to near terminal lugs 28 are formed at predetermined intervals from each other in the tinsel cord support member, and a hollow portion 30a is provided between the two grooves formed in the tinsel cord support member 30.
    Type: Grant
    Filed: March 26, 1998
    Date of Patent: November 17, 1998
    Assignees: Mitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Denki Kabushiki Kaisha
    Inventors: Masanobu Sato, Fujio Hayakawa, Ikuo Saga, Taizo Nakamura
  • Patent number: 4899030
    Abstract: Method and apparatus for high-power-density beam welding in combination with upset welding. The method comprises forming, along abutting edges of metal materials to be welded, a continuous upset weld line, and subsequently beam welding the metal materials by irradiation by a high-power-density beam along the weld line. The output of the high-power-density beam is determined on the basis of an input heat produced by resistance heating in the metal materials during the upset welding, as well as a welding pressure given to the metal materials during the upset welding.
    Type: Grant
    Filed: September 6, 1988
    Date of Patent: February 6, 1990
    Assignee: Nippon Steel Corporation
    Inventors: Yasunobu Miyazaki, Tohru Saito, Taizo Nakamura
  • Patent number: 4856965
    Abstract: A control system of pumping operation comprises a cycloconverter for converting AC power from a AC power system into AC power having a given frequency, anAC exciting generator-motor, having a stator side electrically connected to the AC power system, having a rotor side electrically connected to the cycloconverter, and having a rotor shaft mechanically coupled to a pump-turbine by which the pumping operation is carried out, a circuit breaker inserted between the AC power system and the AC exciting generator-motor, a rotation speed controller for controlling a rotation speed of the AC exciting generator-motor such that the rotation speed becomes slow when the pumping operation is to be stopped, an AC excitation controller for decreasing a degree of excitation effected by the cycloconverter, wherein decreasing of the excitation degree starts when the rotation speed of the AC exciting generator-motor reaches a given minimum value, and a circuit breaker controller for turning off the circuit breaker when input po
    Type: Grant
    Filed: October 21, 1988
    Date of Patent: August 15, 1989
    Assignees: The Tokyo Electric Power Co. Inc., Kabushiki Kaisha Toshiba
    Inventors: Masahiro Katsuie, Michiyuki Abe, Katsuyuki Kawahara, Taizo Nakamura
  • Patent number: 4767907
    Abstract: A method of igniting arcs wherein an electric field is formed in the vicinity of an electrode and ignition-plasma is projected against a cathode in the electric field, to thereby ignite an arc.
    Type: Grant
    Filed: April 25, 1986
    Date of Patent: August 30, 1988
    Assignee: Nippon Steel Corporation
    Inventors: Tadayuki Otani, Taizo Nakamura, Tohru Saito
  • Patent number: 4692629
    Abstract: In an optical measuring device which comprises a polygonal rotary mirror for reflecting an incident light beam into a rotary scanning light beam, a collimator lens for converting the rotary scanning light beam into a parallel scanning light beam and a light receiving element for detecting bright and dark portions of the parallel scanning light beam, which has scanned a work to be measured, and a time duration of the dark portion or the bright portion is detected, which has been generated by the obstruction of a part of the parallel scanning light beam by the work, to thereby determine a dimension of the work, the collimator lens is made to be an f.theta. lens having such a spherical aberration that a light beam incident from the outlet side of the collimator lens toward the polygonal rotary mirror in parallel to the optical axis of the lens intersects the optical axis of the lens at a position shifted from a focal point on the inlet side to the outlet side by .DELTA.
    Type: Grant
    Filed: June 10, 1985
    Date of Patent: September 8, 1987
    Assignee: Mitutoyo Mfg., Co., Ltd.
    Inventor: Taizo Nakamura
  • Patent number: 4639098
    Abstract: A microscope wherein a plurality of objective lens barrels (25) are mounted to a disk (23) in such a manner that the axial lines thereof are in parallel with the center axis of the disk (23), the disk (23) is rotatably provided on the undersurface of an upper frame (12A) of the main body (12) in such a manner that the axial line thereof is in parallel with the optical axis (18) of the main body, a large diameter screw (50) having a recess (50B) is affixed to the top surface of the upper frame (12A) a three lens barrel (13) is rested on this large diameter screw (50) and fixed to the large diameter screw (50) through a clamp member (14), and further, rectangular prisms (60) and a roof prism (74) for making it possible to visually observe a non-inverted image are provided in the three lens barrel (13).
    Type: Grant
    Filed: November 28, 1984
    Date of Patent: January 27, 1987
    Assignee: Mitutoyo Mfg. Co., Ltd.
    Inventors: Tsutomu Aoyama, Taizo Nakamura, Naoyosi Terao, Hirohiko Shinonaga