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Photographic camera with built-in optical converter

  • US 4,214,829 A
  • Filed: 06/01/1978
  • Issued: 07/29/1980
  • Est. Priority Date: 06/01/1977
  • Status: Expired due to Term
First Claim
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1. A photographic camera comprising, in combination:

  • a camera body including a front wall having an opening therein at a position opposed to a focal plane within the camera body where a photosensitive film, when loaded in the camera, is positioned;

    an objective lens assembly including a fixed barrel having one end secured to the camera body in alignment with the opening in said front wall of the camera body, an objective lens means providing a principal optical system of a first predetermined focal length, a lens mount means for supporting the objective lens means for movement together therewith, a focusing barrel means positioned on one side of the fixed barrel remote from the camera body, in alignment with any one of the fixed barrel and the optical axis of the objective lens means, said focusing barrel means being supported by said fixed barrel for rotation about the optical axis of the objective lens means through first and second predetermined focusing angles, and a motion translating barrel means positioned substantially internally of the fixed barrel and the focusing barrel means and externally of said lens mount means for transmitting rotary motion of said focus adjusting barrel means to said lens mount means to move the latter in an axial direction parallel to the optical axis of the objective lens means, said force adjusting barrel means, when rotated through the first predetermined focusing angle, rendering the principal optical system operable to take a photographic picture of a target object to be photographed and said focus adjusting barrel means, when rotated through the second predetermined focusing angle, rendering another optical system of a second predetermined focal length, different from said first predetermined focal length of said principal optical system, operable to take a photographic picture of a target object to be photographed;

    a converter lens means;

    means for supporting said converter lens means for movement between an operative position, in which the converter lens means is exactly in alignment with the optical axis of the objective lens means to provide said another optical system in cooperation with said objective lens means, and an inoperative position in which the converter lens means is out of alignment with the optical axis of the objective lens means; and

    means for causing said supporting means to move from the inoperative position to the operative position in response to change from the capability of rotation of the focus adjusting barrel means within the range of the first predetermined focusing angle to the capability of rotation of the focus adjusting barrel means within the range of the second predetermined focusing angle, and vice versa, said supporting means comprising a pivotably supported, elongated arm member having one end rigidly carrying the converted lens means and the other end carrying an engagement element, means for biasing said arm member toward the operative position and wherein said causing means comprises cam means operatively coupled to the focus adjusting barrel means, said cam means having a cam in constant engagement with said engagement element under the influence of the biasing force of said biasing means and said cam being shaped such that, so long as the focus adjustment barrel means is rotated within the range of the first predetermined focusing angle, the supporting means is held in the operative position, and so long as the focus adjusting barrel means is rotated within the range of the second predetermined focusing angle, the supporting means is held in the inoperative position.

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