Automatic and manual focus control for objective lens assembly

Details Automatic and manual focus control for objective lens assembly Automatic and manual focus control for objective lens assembly

1980-07-10

1983-11-22

Evans, F. L.

354195, G02B 704, G03B 300

Patent

active

044165137

ABSTRACT:
A lens is provided with a first and second lens groups which can focus not only with their concurrent movement along the optical axis but also with the movement of either one of the two lens groups. The first and second lens groups are respectively carried by first and second movable barrels. First means is provided for shifting both of first and second movable barrels concurrently in accordance with manual focus control. Second means is provided for shifting the second movable barrel without causing any movement of the first movable barrel. Thus, members to be moved for focusing upon automatic focus control are less in number in comparison with the members upon manual focus control.

REFERENCES:
patent: 3884555 (1975-05-01), Suwa et al.
patent: 4231646 (1980-11-01), Iida
patent: 4272174 (1981-06-01), Terramoto et al.

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