| 摘要 |
A motor control device includes a bridge circuit having semiconductor switching elements disposed in each arm thereof and being adapted for the connection of a motor between pairs of arms. The semiconductor switching elements are selectively rendered conductive to alternately drive the motor in forward and reverse directions, and certain ones of a semiconductor switching elements may be simultaneously rendered conductive to form a closed loop which short-circuits the motor and causes dynamic braking. The motor control device is capable of instantaneously stopping the rotation of the motor and is capable of rapidly reversing the motor's direction of rotation. The device is particularly useful in an automatic focusing apparatus or an automatic diaphragm setting apparatus in a camera.
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