Shutter apparatus which also serves as a diaphragm

Details Shutter apparatus which also serves as a diaphragm Shutter apparatus which also serves as a diaphragm

1990-08-30

1992-01-07

Adams, Russell E.

354484, G03B 726

Patent

active

050795830

ABSTRACT:
This invention relates to a shutter apparatus which also serves as a diaphragm. In this invention, there are provided two drive control modes for the shutter apparatus; the first mode for controlling a control voltage to be supplied to a shutter driving motor and the second mode for controlling the duty of a voltage to be applied to the motor. These two modes are switched according to factors such as a power source voltage, whereby optimum shutter control is implemented.

REFERENCES:
patent: 4037236 (1977-07-01), Numata et al.
patent: 4643558 (1987-02-01), Hasegawa
patent: 4645326 (1987-02-01), Kiuchi et al.
patent: 4922283 (1990-05-01), Fukui
patent: 4931824 (1990-06-01), Takahashi

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