Patents by Inventor Taku Matsuo

Taku Matsuo 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).

  • Zoom optical system, optical apparatus equipped therewith and method for manufacturing the zoom optical system
    Patent number: 8189269
    Abstract: Composing a zoom optical system ZL, in order from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having negative refractive power; and disposing each lens group with satisfying a given conditional expression (1); thereby providing a zoom optical system ZL capable of suppressing variation in aberrations upon zooming and carrying out excellent vibration reduction, an optical apparatus equipped therewith, and a method for manufacturing the zoom optical system.
    Type: Grant
    Filed: July 8, 2010
    Date of Patent: May 29, 2012
    Assignee: Nikon Corporation
    Inventor: Taku Matsuo
  • OBSERVATION OPTICAL SYSTEM, VIEWFINDER EQUIPPED WITH OBSERVATION OPTICAL SYSTEM AND METHOD FOR MANUFACTURING OBSERVATION OPTICAL SYSTEM
    Publication number: 20120127595
    Abstract: An observation optical system for observing an object includes, in order from the object side: a first lens having positive refractive power; a second lens having negative refractive power and a concave surface facing the object side; and a third lens having positive refractive power and a convex surface facing an eyepoint side. An aspherical surface is included on at least one lens surface, and given conditional expressions are satisfied, thereby providing a compact observation optical system having excellent optical performance, a viewfinder equipped with the observation optical system, and a method for manufacturing the observation optical system.
    Type: Application
    Filed: September 20, 2011
    Publication date: May 24, 2012
    Inventor: Taku MATSUO
  • ZOOM OPTICAL SYSTEM, OPTICAL APPARATUS EQUIPPED THEREWITH AND METHOD FOR MANUFACTURING THE ZOOM OPTICAL SYSTEM
    Publication number: 20110007403
    Abstract: Composing a zoom optical system ZL, in order from an object side, a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, a fourth lens group G4 having positive refractive power, and a fifth lens group G5 having negative refractive power; and disposing each lens group with satisfying a given conditional expression (1); thereby providing a zoom optical system ZL capable of suppressing variation in aberrations upon zooming and carrying out excellent vibration reduction, an optical apparatus equipped therewith, and a method for manufacturing the zoom optical system.
    Type: Application
    Filed: July 8, 2010
    Publication date: January 13, 2011
    Inventor: Taku MATSUO