Automatic iris control means for variable focal length lens syst

Details Automatic iris control means for variable focal length lens syst Automatic iris control means for variable focal length lens syst

1974-10-16

1977-11-29

Schaefer, Robert K.

Electricity: motive power systems

Positional servo systems

With particular 'error-detecting' means

318676, 354271, 354 44, G05B 106

Patent

active

040607569

ABSTRACT:
A servo-motor connected with potentiometers to be balanced is used for controlling the diameter of an iris of a lens system of variable focal length. One potentiometer to be used for detecting the position of control is connected with a plurality of change-over switches by way of different resistors. The change-over switches are changed in response to the change of the focal length to correct the iris with reference to the changed focal length.

REFERENCES:
patent: 2393407 (1946-01-01), Peterson
patent: 2393408 (1946-01-01), Peterson
patent: 3405335 (1968-10-01), Inose et al.
patent: 3541941 (1970-11-01), Barr et al.
patent: 3743912 (1973-07-01), Mashimo
patent: 3824439 (1974-07-01), Pinckaers

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