Stretched diaphragm aperture for an optical system

Details Stretched diaphragm aperture for an optical system Stretched diaphragm aperture for an optical system

1997-01-21

1998-03-17

Perkey, W. B.

Photography

Camera detail

Diaphragm

396227, G03B 902

Patent

active

057297835

ABSTRACT:
An aperture mechanism for controlling the aperture of an optical system includes a flexible diaphragm having an opening at its center for forming a first aperture value for the optical system and means for stretching the diaphragm to enlarge the opening and form at least one additional aperture value for the optical system. A stepper motor is used to stretch the diaphragm to form a plurality of aperture values for the optical system. Because the size of the aperture is determined by how much the diaphragm is stretched, the backlash between the stepper motor and related gearing is kept to a minimum due to the elastic properties of the diaphragm, which provides economical and accurate control of very small apertures.

REFERENCES:
patent: 3336852 (1967-08-01), Levin
patent: 3456351 (1969-07-01), Gehmann
patent: 3843267 (1974-10-01), Vital et al.
patent: 4910739 (1990-03-01), Sheng
patent: 5150702 (1992-09-01), Miyanaga et al.
patent: 5589906 (1996-12-01), Shimizu

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