Ratio preserving control system

Details Ratio preserving control system Ratio preserving control system

1977-07-28

1979-05-29

Ruggiero, Joseph F.

Boots, shoes, and leggings

350187, 364400, G06G 766, G02B 710

Patent

active

041569334

ABSTRACT:
A ratio preserving method and apparatus for a system having a plurality of operating values, each independently changeable over a prescribed quantity range by a change in a separate control input by selectively interconnecting the separate control inputs so that change in one of the interconnected control inputs produces an appropriate change in the other interconnected control inputs to maintain the selected fixed ratio between the interconnected operating values. One such system illustrated is a zoom lens where the ratio between object distance and focal length can be selectively fixed to keep the image size constant while the focus is changed when the distance between the object and the lens 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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