Patents by Inventor Sadao Okudaira

Sadao Okudaira 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).

  • Variable focal length lens system
    Patent number: 4074931
    Abstract: A variable focal length lens system is disclosed having wide angle capability and a small size. The system has seven lenses divided in two groups. The first group consists of three of the lenses and is movable relative to the second group, which consists of the remaining four lens.
    Type: Grant
    Filed: January 15, 1976
    Date of Patent: February 21, 1978
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Sadao Okudaira
  • Retrofocus type wide angle lens of low F-number
    Patent number: 3976367
    Abstract: A wide angle lens of high performance comprising twelve lenses grouped in ten components which satisfies the following four conditions:F/1.8 <.vertline. F.sub. 1.2.3.4.vertline.< F/1.1, F.sub.1.2.3.4. < 0 (1)F/0.6 <.vertline. F.sub.1.2.3.4.5.6 .vertline.< F/0.15, F.sub.1.2.3.4.5.6 < 0 (2i)F/1.4 <F.sub.1.2.3.4.5.6.7 < F/0.8 (2ii)0.1 < n.sub.8 - n.sub.9 <0.2 (3)0.3.sub.l < (d.sub.1 + d.sub.2 + d.sub.3 + d.sub.4 + d.sub.5) < 0.
    Type: Grant
    Filed: February 3, 1975
    Date of Patent: August 24, 1976
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventors: Yasuo Takahashi, Sadao Okudaira
  • Large aperture super wide angle lens
    Patent number: 3966306
    Abstract: A super wide angle lens system consisting of thirteen lenses grouped in eleven lens components wherein the following conditions (1) to (6) are satisfied:F/0.75 <.vertline.F.sub.1.2 .vertline.<F/0.45, F.sub.1.2 <0 1.f/0.32 <.vertline.f.sub.1.2.3 .vertline.<f/0.18, f.sub.1.2.3 <0 2.0.8 <f/f.sub.6 <2.5 3.0.4F <d.sub.17 <0.7F F 4.1.2f <r.sub.20 <1.8F, 1.75 <n.sub.11 5.58 < ( .nu..sub.10 + .nu..sub.12 + .nu..sub.13) / 3 < 71. 6.
    Type: Grant
    Filed: February 6, 1975
    Date of Patent: June 29, 1976
    Assignee: Asahi Kogaku Kogyo Kabushiki Kaisha
    Inventor: Sadao Okudaira