Patent
1976-09-03
1978-07-11
Sacher, Paul A.
G02B 1518
Patent
active
040998479
ABSTRACT:
Variable power lenses and correcting lenses are integrally moved a prescribed distance toward an object to be photographed without changing a spacing maintained between the two lens groups in ordinary photography, so as to attain the state capable of close-up photography. Said variable lenses and said correcting lenses are caused to perform zooming movement for adjusting the focus for close-up photography.
A cam cylinder for moving said variable power lenses and said correcting lenses while keeping a spacing maintained between the two lens groups in ordinary photography is disposed so that said variable power lenses and said correcting lenses are moved linearly a prescribed length in the direction of the optical axis integrally with said cam cylinder toward an object to be photographed without changing the spacing between the two lens groups, so as to attain the state capable of close-up photography. By rotation of said cam cylinder, said variable power lenses and said correcting lenses are caused to perform zooming movement for adjusting the focus for close-up photography.
REFERENCES:
patent: 3661445 (1972-05-01), Someya
patent: 3784285 (1974-01-01), Watanabe et al.
patent: 3817600 (1974-06-01), Watanabe et al.
patent: 3992084 (1976-11-01), Nakamura
Nitto Kogaku Kabushiki Kaisha
Sacher Paul A.
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