Patents by Inventor Etsuko Nakai

Etsuko Nakai 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).

  • Patent number: 5153735
    Abstract: A still camera for recording a still image by making use of an electronic signal has a taking lens system incorporated in a camera body in such a manner that one end portion thereof is directed to an object to be photographed for making an image of the object to obtain the electronic signal; a light emitting portion of an electronic flash device incorporated in the camera body in such a manner that one end portion thereof is directed to the object for emitting a flash light toward the object; and a recording medium containing portion arranged between the light emitting portion and taking lens system.
    Type: Grant
    Filed: November 9, 1990
    Date of Patent: October 6, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Dai Shintani, Takeo Hoda, Toshio Yamaki, Yoshihiro Tanaka, Etsuko Nakai, Sadafusa Tsuji
  • Patent number: 5117247
    Abstract: A viewfinder optical system, separate from a photographing optical system, for picture taking. The viewfinder optical system includes an objective lens, an eyepiece, and a compensation lens. The compensation lens is capable of being positioned in an optical path of the viewfinder optical system at object distances closer than a predetermined distance for simultaneously compensating for any variance in parallax and diopter between the viewfinder optical system and the photographing optical system in the macro mode.
    Type: Grant
    Filed: May 24, 1990
    Date of Patent: May 26, 1992
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Etsuko Nakai, Hiromu Mukai
  • Patent number: 4992875
    Abstract: A still camera for recording an object image by making use of an electronic signal such as a still video camera is so constructed that a recording medium is positioned nearly in parallel with an optical axis of a taking lens system and also in the lateral direction to the taking lens system. Therefore, the camera body thereof can be formed in a flat shape, and additionally a red-eye phenomenon can be prevented from occurring by arranging a light emitting portion of an electronic flash device and the taking lens system sufficiently apart from each other.
    Type: Grant
    Filed: July 18, 1989
    Date of Patent: February 12, 1991
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Dai Shintani, Takeo Hoda, Toshio Yamaki, Yoshihiro Tanaka, Etsuko Nakai, Sadafusa Tsuji
  • Patent number: 4978199
    Abstract: A finder optical system comprises a first reflecting surface disposed at an image side of an objective lens to reflect light flux passing through the objective lens obliquely upward on the exit pupil side, a roof surface consisting of two reflecting surfaces orthogonally intersecting each other which is disposed obliquely upward on the exit pupil side of the first reflecting surface to perform right-left inversion of the light flux reflected by the first reflecting surface and to reflect the light flux obliquely downward on the exit pupil side, and a second reflecting surface disposed obliquely downward on the exit pupil side of the roof surface to perform an up-down inversion of the light flux reflected obliquely downward on the exit pupil side by the roof surface and reflect the light flux toward an eyepiece, and wherein the finder optical system fulfills the following condition: 20.degree.<.theta.<40.degree. wherein, .theta.
    Type: Grant
    Filed: June 13, 1989
    Date of Patent: December 18, 1990
    Assignee: Minolta Camera Kabushiki Kaisha
    Inventors: Hiromu Mukai, Etsuko Nakai