Apparatus for driving stepper motor of camera

Details Apparatus for driving stepper motor of camera Apparatus for driving stepper motor of camera

1998-02-09

2000-03-21

Martin, David

Electricity: motive power systems

Open-loop stepping motor control systems

318685, 396132, 396135, H02P 800

Patent

active

060406771

ABSTRACT:
A stepping motor driving apparatus for a camera having a 1-2 phase excitation type stepping motor which is driven by a 1-2 phase excitation in response to a drive signal includes a drive control device for stopping the stepping motor at a 1-phase excitation position by de-energizing the stepping motor at the 1-phase excitation position and for stopping the stepping motor at a 2-phase excitation position while maintaining the excitation in a high precision drive control in which the stepping motor is driven at high precision. The drive control device stops the stepping motor by de-energizing the stepping motor always at the 1-phase excitation position in a normal drive control in which no precise drive control of the stepping motor is needed.

REFERENCES:
patent: 4812727 (1989-03-01), Sakai et al.
patent: 5117137 (1992-05-01), Kobayashi
patent: 5126896 (1992-06-01), Yamagata
patent: 5594311 (1997-01-01), Yasuda et al.

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