Variable size circular aperture camera
 Apparatus is disclosed for exposing circular patterns of light on a photosensitive surface by providing, spaced from the surface, a lengthwise variable light source focusable on the photosensitive surface and rotatable relative to the surface about an axis of rotation passing through the center of the photosensitive surface and the light source. In a modification, the axis of rotation passes through the center of the photosensitive surface and through a point radially offset from the light source. 
International Business Machines Corporation
G H
G03F H05K
inventional additional
Gerry W. Guy A.
Moore Deighton