Ratio preserving control system for a lens

Details Ratio preserving control system for a lens Ratio preserving control system for a lens

1978-04-10

1979-03-20

Ruggiero, Joseph F.

Boots, shoes, and leggings

364117, 350187, G06G 766, G02B 710

Patent

active

041457323

ABSTRACT:
A ratio preserving control system for a camera zoom lens for selectively interconnecting the object distance (focus) control mechanism and the focal length (zoom) control mechanism to selectively and automatically maintain a selected ratio between the object distance value of the lens and the focal length value of the lens so as to maintain a selected constant image size while the focal length value is changed to keep an object in focus when the distance between the object and the lens is changing or changes.

REFERENCES:
patent: 1950166 (1934-03-01), Durholz
patent: 2663223 (1953-12-01), Hopkins
patent: 3733476 (1973-05-01), Hopkins et al.
patent: 3765748 (1973-10-01), Mito
patent: 3834648 (1974-09-01), Rose, Jr. et al.
patent: 4048964 (1977-09-01), Kissel

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