Camera lens shutter unit having a structure which reduces the sh

Details Camera lens shutter unit having a structure which reduces the sh Camera lens shutter unit having a structure which reduces the sh

1996-05-29

1998-04-28

Blankenship, Howard B.

Photography

Camera detail

Shutter

G03B 908

Patent

active

057458146

ABSTRACT:
A camera lens shutter having separate aperture blades and shutter blades arranged in a manner to provide a shutter unit having decreased thickness. The lens shutter includes a first shading member to expose an exposure aperture when in an open state and to cover the exposure aperture when in a closed state. A first circular cam drives the primary shading member. A second shading member forms a plurality of aperture diameters, and a second circular cam drives the second shading member. The inner diameter of either the first or second cam is made larger than the outer diameter of the other. The lens shutter may also include a shading member to expose an exposure aperture wherein an open state, a first circular cam to drive the first shading member, a second shading member to cover or close the exposure aperture, a second circular cam to drive the second shading member, a third shading member to form a plurality of aperture diameters, and a third circular cam to drive the third shading member. The respective cams of the shutter units are positioned concentrically and may be on approximately the same plane to provide a thinner shutter unit.

REFERENCES:
patent: 4227792 (1980-10-01), Rentschler

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