Compensating mechanism for zoom lens

Details Compensating mechanism for zoom lens Compensating mechanism for zoom lens

1981-09-09

1984-09-25

Gellner, Michael L.

354286, G03B 906

Patent

active

044732813

ABSTRACT:
A zoom lens for a camera having automatic diaphragm control has an element for adjusting the focal distance of the lens, a displaceable actuator, a diaphragm variable between a maximum aperture value and a minimum aperture value responsive to displacement of the actuator, and an element for displacing the actuator upon shutter release. An element maintains the diaphragm at the maximum aperture value during an initial portion of the displacement of the actuator. Another element changes such initial portion responsive to the adjusting element to compensate for changes in lens characteristics as the focal length is adjusted.

REFERENCES:
patent: 3997906 (1976-12-01), Kashiwase
patent: 4245901 (1981-01-01), Karikawa et al.

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