| 摘要 |
PURPOSE:To prevent a stop position disorder of a parts to be driven, by stopping a pulse motor by one phase excitation, in a device for driving the pulse motor by two phase excitation. CONSTITUTION:When a driving instruction of a lens block is given, a microprocessor 41 sets a prescribed excitation phase to an output port 42, switches an excitation phase of a pulse motor 33 in the moving direction of a lens block 8 and rotates it. A timer 43 counts down a set data D0 successively, sets the following excitation phase to the output port 42 by a time-out signal, sets a data D1 again and repeats the same operation. In this way, the excitation phase is switched successively, the pulse motor 33 is driven by two phase excitation and the lens block is moved. When the movement is ended, the pulse motor is stopped by switching forcibly to one phase excitation, and the movement is ended. |
