Zoom lens apparatus

Details Zoom lens apparatus Zoom lens apparatus

1986-04-21

1988-04-26

Corbin, John K.

G02B 711, G02B 1514

Patent

active

047400641

ABSTRACT:
A zoom lens apparatus comprises sensors for detecting relative positions of a variable power lens group and a compensating lens group, a memory for pre-storing compensating data peculiar to the zoom lens apparatus, a control circuit and driving parts for moving the variable power lens group and the compensating lens group. The control circuit compares position data set by a variable power setting operation and position data obtained from the sensors and outputs signals for controlling the relative positions of the variable power lens group and the compensating lens group based on the compensating data read out from the memory. The driving parts vary the relative positions of the variable power lens group and the compensating lens group responsive to the output signals of the control circuit.

REFERENCES:
patent: 4054372 (1977-10-01), Schroeder
patent: 4161756 (1979-07-01), Thomas

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