Diaphragm drive method

Details Diaphragm drive method Diaphragm drive method

1986-10-03

1988-06-14

Perkey, W. B.

G03B 7095

Patent

active

047515449

ABSTRACT:
A diaphragm device having a plurality of blades defining an aperture opening whose size is varied by a stepwise drive. For the adjustment of the size to small values, the driving of the diaphragm blades is controlled in such a manner that they are first driven excessively by at least one step and then backward by the corresponding number of steps to that excess.

REFERENCES:
patent: 4104656 (1978-08-01), Strauss
patent: 4299459 (1981-11-01), Mizokami
patent: 4615600 (1986-10-01), Nakajima

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