Patents by Inventor Toshitake Kitagawa

Toshitake Kitagawa 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).

  • Lens, lens device, camera module and electrical equipment
    Patent number: 6507443
    Abstract: A lens comprises a single lens, both surfaces of the lens is a meniscus-shaped and aspheric lens, and side surface side thereof is a convex surface, and, when a refractive index of the lens is represented by n, a central thickness thereof is represented by t, a radius of curvature of a concave face thereof is represented by r1, the radius of curvature of the convex face thereof is represented by r2, and a focal length thereof is represented by f, the lens satisfies the following equations: - 0.2 < ( n - 1 r1 ) / f < 0 , ⁢ 0.
    Type: Grant
    Filed: November 30, 2000
    Date of Patent: January 14, 2003
    Assignee: Kabushiki Kaisha Toshiba
    Inventor: Toshitake Kitagawa
  • Lens, lens device, camera module and electrical equipment
    Publication number: 20010003494
    Abstract: A lens comprises a single lens, both surfaces of the lens is a meniscus-shaped and aspheric lens, and side surface side thereof is a convex surface, and, when a refractive index of the lens is represented by n, a central thickness thereof is represented by t, a radius of curvature of a concave face thereof is represented by r1, the radius of curvature of the convex face thereof is represented by r2, and a focal length thereof is represented by f, the lens satisfies the following equations: 1 - 0.2 <   ⁢ ( n - 1 r1 ) / f < 0 , 0.08 <   ⁢ ( 1 - n r2 ) / f < 0.1 , and 0.35 <   ⁢ t f < 0.55 .
    Type: Application
    Filed: November 30, 2000
    Publication date: June 14, 2001
    Inventor: Toshitake Kitagawa