Shutter driving apparatus

Details Shutter driving apparatus Shutter driving apparatus

1986-10-28

1988-01-19

Perkey, W. B.

Electricity: motive power systems

Motor-reversing

Armature or primary circuit control

318696, G03B 700, H02P 800

Patent

active

047207264

ABSTRACT:
A shutter driving apparatus drives a programmed shutter with a stepping motor, by using a driving current pulse whose waveform has a leading half that gradually increases in amplitude and a trailing half having an amplitude smaller than the peak value of the pulse. At each rotary stage of the stepping motor, a smooth starting operation can be ensured without any adverse inertial effect at the start or end of rotation, the stepping motor being temporarily driven at low speed at the end of each pulse. In the case of an aperture priority exposure control using a programmed shutter, disadvantageous ripple motion of the shutter sectors is eliminated, thus enabling high precision exposure control.

REFERENCES:
patent: 4648701 (1987-03-01), Ogihara et al.

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