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US 4,525,050 AGranted
Photographic camera with built-in optical converter
AssigneeFuji Photo Film Co., Ltd.
InventorSaichiro Ohashi
Life of this patent
Estimating the term…
Abstract
A photographic camera comprising a principal lens assembly and a converter lens assembly for providing a focal length different from that of the principal lens assembly when used. The converter lens assembly is carried by an intermediate barrel for the support of the principal lens assembly through a lens mount such that the converter assembly can move together with the principal lens assembly. A switching mechanism is also used for selectively bringing the converter lens assembly into and out of alignment with the optical axis of the principal lens assembly.
Claims5
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 an objective lens means providing a principal optical system of a first predetermined focal length and a lens mount means for supporting the objective lens means in alignment with the opening in the front wall of the camera body;
- a converter lens means carried by the lens mount means for movement together therewith in a direction parallel to the optical axis of the lens assembly;
- means for shifting the lens mount means in a direction parallel to the optical axis between a first mode position where the converter lens means is out of alignment with the objective lens assembly and a second mode position where the converter lens is aligned with the objective lens means;
- and
- means operatively engaging said shifting means for selectively switching the converter lens means into and out of alignment with the objective lens means when the object lens assembly is shifted to the second and first positions, respectively.
3 more elements
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 an objective lens means providing a principal optical system of a first predetermined focal length and a lens mount for supporting the objective lens assembly in alignment with the opening in the front wall of the camera body;
- an intermediate barrel threadingly mounted on the lens mount;
- a guide rod means rigidly connected to the camera body and extending in a direction parallel to the optical axis and operatively engaging said intermediate barrel for guiding the intermediate barrel so as to limit its movement to one only in a direction parallel to and along the optical axis of the objective lens assembly;
- a focus adjusting means for rotating the lens mount relative to the intermediate barrel for focus adjustment to focus an image of an object to be photographed on the focal plane;
- an outer barrel means for supporting the intermediate barrel on the camera body;
- an actuating barrel interposed between the outer barrel means and the intermediate barrel and operable to shift the intermediate barrel together with the lens mount in a direction parallel to the optical axis when rotated between first and second position;
- a converter lens means carried by said intermediate barrel at a position behind the objective and frontwardly of the focal plane for movement together therewith in a direction parallel to the optical axis of the lens assembly;
- means for rotating the actuating barrel, between first and second positions;
- and
- means for causing the converter lens means to move between an operative position, in which the converter lens is in alignment with the optical axis of the objective lens, and an inoperative position, in which the converter lens is out of alignment with the optical axis of the objective lens, in response to the rotation of the actuating barrel to said second and first positions, respectively.
8 more elements
Dependencies are inferred from the claim text.