Patents Assigned to Chiba Precision Co., Ltd.
  • Patent number: 9097561
    Abstract: Provided is a position transducer which can be manufactured at low cost, improve the signal-to-noise ratio of an output obtained from a detector, and obtain a stable output even if the temperature changes. A position transducer 100 includes a butterfly-shaped reflector 7 attached to a rotating shaft 2 of a rotation restriction motor 1, an LED die 4 disposed to face a central portion of the reflection surface of the reflector 7, a diffused-light absorbing member disposed on the surfaces of a diffused light absorber 3 and a case 5, installed on the fixed side of the motor 1 so as to surround the reflector 7 with a distance from the reflector 7 at the rear of the reflector 7 as viewed from the LED die 4 and absorbing illumination light from the LED die 4 which has not illuminated the reflection surface, and detectors 11 mounted on the same printed circuit board 6 as the LED die 4 to detect an image reflected by the reflector 7.
    Type: Grant
    Filed: October 25, 2013
    Date of Patent: August 4, 2015
    Assignees: CITIZEN CHIBA PRECISION CO., LTD., CITIZEN HOLDINGS CO., LTD.
    Inventors: Hideaki Sato, Kazunari Ogata, Naoki Ohta, Asuka Moritaku, Tomonori Takeda
  • Patent number: 7504794
    Abstract: A common electrode plate formed on a common electrode base attached to the lower surface of the movable stage faces a split electrode plate formed on a split electrode base attached to the upper surface of a main base, which are apart from each other at a predetermined interval. A support mechanism formed of ball bearings, ball stoppers at the movable side, steel balls, ball stoppers at the fixed side, and ball bearings allows the movable stage to move in directions of the X-axis, Y-axis and turning. A linear actuator 19 is driven to move the movable stage in the directions of X-axis, Y-axis, and turning.
    Type: Grant
    Filed: November 29, 2006
    Date of Patent: March 17, 2009
    Assignee: Chiba Precision Co., Ltd.
    Inventors: Hideaki Sato, Kennosuke Kondo
  • Publication number: 20080122397
    Abstract: A common electrode plate formed on a common electrode base attached to the lower surface of the movable stage faces a split electrode plate formed on a split electrode base attached to the upper surface of a main base, which are apart from each other at a predetermined interval. A support mechanism formed of ball bearings, ball stoppers at the movable side, steel balls, ball stoppers at the fixed side, and ball bearings allows the movable stage to move in directions of the X-axis, Y-axis and turning. A linear actuator 19 is driven to move the movable stage in the directions of X-axis, Y-axis, and turning.
    Type: Application
    Filed: November 29, 2006
    Publication date: May 29, 2008
    Applicant: Chiba Precision Co., Ltd.
    Inventors: Hideaki Sato, Kennosuke Kondo
  • Patent number: 6949845
    Abstract: A planar motor permits a thinner design, controlled vibration, and highly accurate positioning by disposing X-axis and Y-axis coreless type linear motors on the same plane without using an expensive linear guide and by incorporating high-accuracy capacitance displacement sensors in X and Y directions. Two pairs of permanent magnets are disposed such that they are respectively orthogonalized with respect to two axes that are orthogonalized with each other on a movable stage and that they generate magnetic fluxes in a direction perpendicular to a surface of the movable stage. Furthermore, the permanent magnets of one pair are disposed symmetrically to each other about one of the two axes, while those of the other pair are disposed symmetrically to each other about the other axis. Two pairs of coils are provided such that they oppose and match the two pairs of permanent magnets.
    Type: Grant
    Filed: July 2, 2004
    Date of Patent: September 27, 2005
    Assignee: Chiba Precision Co., Ltd.
    Inventors: Yutaka Oisugi, Hideaki Sato
  • Publication number: 20050116548
    Abstract: A planar motor permits a thinner design, controlled vibration, and highly accurate positioning by disposing X-axis and Y-axis coreless type linear motors on the same plane without using an expensive linear guide and by incorporating high-accuracy capacitance displacement sensors in X and Y directions. Two pairs of permanent magnets are disposed such that they are respectively orthogonalized with respect to two axes that are orthogonalized with each other on a movable stage and that they generate magnetic fluxes in a direction perpendicular to a surface of the movable stage. Furthermore, the permanent magnets of one pair are disposed symmetrically to each other about one of the two axes, while those of the other pair are disposed symmetrically to each other about the other axis. Two pairs of coils are provided such that they oppose and match the two pairs of permanent magnets.
    Type: Application
    Filed: July 2, 2004
    Publication date: June 2, 2005
    Applicant: Chiba Precision Co., Ltd.
    Inventors: Yutaka Oisugi, Hideaki Sato
  • Patent number: 6729762
    Abstract: In an aerostatic gas bearing, slot sections can be easily processed, bearing stiffness and a load capacity can be improved, and an amount of gas flow can be greatly reduced as compared with a conventional circular slot restriction bearing. A multiplicity of radial slots are formed on both the end surfaces of a bearing member. A bearing housing is assembled by fixing slot side plates on both the side surfaces thereof and accommodated in a casing, and a shaft having an outside diameter slightly smaller than the inside diameter of the bearing housing is inserted through the bearing housing. Gas is fed from a gas feed port and flown into a multiplicity of slots through a peripheral groove and fed-gas introduction path. The gas flows into the radial bearing clearance between the shaft and the inner peripheral surface of the bearing housing, thereby the shaft is rotatably supported.
    Type: Grant
    Filed: July 19, 2002
    Date of Patent: May 4, 2004
    Assignee: Chiba Precision Co., Ltd.
    Inventors: Matsuo Satou, Shinichi Togo