Zoom lens for photographic printers

Details Zoom lens for photographic printers Zoom lens for photographic printers

1978-10-27

1981-01-27

Henry, Jon W.

350423, G02B 710, G02B 1514

Patent

active

042471680

ABSTRACT:
A three-component zoom lens in which the middle component is axially adjustable and has a positive refractive power which in absolute terms is at least twice that of the other two lens components. A diaphragm is disposed in the movable middle component. For image position correction, means kinematically coupled to the middle component are provided for the joint axial displacement of all three lens components.

REFERENCES:
patent: 1947669 (1934-02-01), Warmisham et al.
patent: 2159394 (1939-05-01), Mellor et al.
patent: 2663223 (1950-07-01), Hopkins
patent: 3625595 (1971-12-01), Fleischman
patent: 3752565 (1973-08-01), Nagashima
patent: 3883228 (1975-05-01), Betensky
patent: 3973831 (1976-08-01), Minovra

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