Patent ID: 8222854
Filing Date: 2012-07-17
Classification: G05B

Abstract:
1. An optical apparatus comprising: an optical member; a stepping motor configured to drive the optical member; a driving commander configured to generate driving pulses supplied to the stepping motor; a driving command generator configured to output a driving command to the driving commander; a pulse count generator configured to count the driving pulses output from the driving commander, the pulse count generator outputting a pulse count to the driving commander; a position detector configured to detect a position of the optical member; and a pulse count presetter configured to replace, after a predetermined relationship is established between the driving command and the pulse count, based on an output of the pulse count generator and an output of the position detector, the pulse count output from the pulse count generator to the driving commander with a pulse count corresponding to the output of the position detector, wherein the driving commander generates the driving pulses based on the pulse count of the driving pulses counted by the pulse count generator and the driving pulses until the predetermined relationship is established between the driving command and the pulse count, and generates the driving pulses based on the pulse count corresponding to the output of the position detector with which the pulse count output from the pulse count generator is replaced by the pulse count presetter and the driving pulses when the predetermined relationship is established between the driving command and the pulse count.