Microfilm camera having a moving lens
AssigneeIBM Corporation
InventorThomas W. Howard
Life of this patent
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Abstract
A microfilm camera employs a reciprocating lens to optically arrest motion of documents traveling in a high-speed stream for photographic exposure onto stationary, incrementally advanced photographic film. The reciprocation of the lens is controlled by a closed loop servo system. To enhance performance of the servo system, the lens is supported by a four-bar linkage comprising relatively stiff light-weight arms interconnected by crossed leaf spring hinges.
Claims7
A camera for recording an image of moving documents onto a substantially stationary photosensitive surface wherein the image is projected onto the photosensitive surface by an optical element supported by a four-bar linkage for movement in proportional synchronism with the document to substantially arrest motion of the image with respect to the photosensitive surface, and wherein the improvement comprises:
- a frame part;
- said four-bar linkage having a pair of side arms and a shuttle arm connected therebetween, each of said arms being configured to have high stiffness and low mass;
- hinge means interconnecting said arms and frame part, said hinge means each comprising a pair of substantially transversely oriented leaf springs which are securely clamped at each end to respective ones of said frame part and said arms.
Dependencies are inferred from the claim text.