Photographic camera using frequency divided pulses for rapid adj

Details Photographic camera using frequency divided pulses for rapid adj Photographic camera using frequency divided pulses for rapid adj

1997-06-04

1998-05-19

Metjahic, Safet

Photography

Having variable focal length of camera objective

Having focus operation

396 86, 396135, G03B 310

Patent

active

057548951

ABSTRACT:
A photographic camera has a movable part to be driven by an electric motor. A rotary encoder generates a pulse for every predetermined angle rotation of the motor and the motor is feedback-controlled on the basis of a pulse signal consisting of a plurality of the pulses output from the rotary encoder. The pulse signal is divided by pulse number into a high-speed portion signal corresponding to a period where the motor is to be driven at a high speed and a low-speed portion signal corresponding to a period where the motor is to be driven at a low speed. The high-speed portion signal is frequency-divided, and the motor is driven at a high speed by the frequency-divided high-speed portion signal.

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