According to a control device for a stepping motor of the present invention, in a first operation mode, a microstep driving section 16 is selected, and an output of this microstep driving section 16 is applied to a driving section 21 through a command selector 12, whereby a stepping motor 25 is microstep...http://www.google.co.uk/patents/US6222340?utm_source=gb-gplus-sharePatent US6222340 - Stepping motor control device and optical head drive device
