Method for controlling a focal-plane shutter having two motors

Details Method for controlling a focal-plane shutter having two motors Method for controlling a focal-plane shutter having two motors

1998-07-27

1999-12-14

Blankenship, Howard B.

Photography

Camera detail

Shutter

G03B 908

Patent

active

060008601

ABSTRACT:
The invention relates to a method for controlling an electronically directly driven focal-plane shutter which has two lightproof curtains, each of which is associated with, and controlled by, an electric drive motor. The drive motors move the curtains across an image field. One curtain starts in a closed position, and the other curtain starts in an open position prior to taking the exposure. So as to achieve operating sequences of the two curtains which are as identical as possible, both drive motors initially are driven simultaneously in an "open" direction. The curtain which starts in the open position first is pressed against a defined open-position stop. Then, by reversing the associated drive motor, that curtain is moved in the "close" direction to complete the exposure.

REFERENCES:
patent: 4290682 (1981-09-01), Saito et al.
patent: 5333025 (1994-07-01), Dowe

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