Patent ID: 9182746
Filing Date: 2015-11-10
Classification: G04C,H02P

Abstract:
1. A stepping motor control circuit comprising: a rotation detection unit that detects a induced signal exceeding a predetermined reference threshold value which is generated by a stepping motor in a detection section divided into at least three sections, and detects a rotation state on the basis of a pattern indicating whether the induced signal exceeding a reference threshold value is detected in each of the sections; and a control unit that selects a main drive pulse depending on the rotation state detected by the rotation detection unit from a plurality of main drive pulses which are different from each other in energy, and drives the stepping motor, wherein when the induced signal exceeding a reference threshold value is not detected in a first section which is an initial section out of the plurality of sections, the rotation detection unit detects the induced signal by shifting an end position of at least one section other than the initial section to a rear side by a predetermined amount.