Patents by Inventor Yuuichi Muramatsu

Yuuichi Muramatsu 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).

  • Large magnification factor zoom lens
    Patent number: 7746563
    Abstract: This large magnification factor zoom lens includes, in an order arranged from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The third lens group includes, in an order arranged from the object side, a positive lens, a positive lens, a positive meniscus lens having a larger radius of curvature on an image surface side, and a negative lens. The positive lens has an aspherical surface on an object side.
    Type: Grant
    Filed: June 19, 2007
    Date of Patent: June 29, 2010
    Assignee: Tamron Co., Ltd.
    Inventors: Yuuichi Muramatsu, Akio Arakawa
  • Large magnification factor zoom lens
    Publication number: 20070297067
    Abstract: This large magnification factor zoom lens includes, in an order arranged from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The third lens group includes, in an order arranged from the object side, a positive lens, a positive lens, a positive meniscus lens having a larger radius of curvature on an image surface side, and a negative lens. The positive lens has an aspherical surface on an object side.
    Type: Application
    Filed: June 19, 2007
    Publication date: December 27, 2007
    Inventors: Yuuichi Muramatsu, Akio Arakawa