Patent ID: 7852033

Claim:
A driving control apparatus for driving a controlled object, said apparatus comprising: first and second interferometers, each of which (i) detects a position of the controlled object in a predetermined direction and (ii) produces a respective, detection value; a control unit configured (i) to obtain a rotation amount of the controlled object based on the detection values produced by the first and second interferometers, at a predetermined measurement timing, (ii) to calculate a controlled variable based on the rotation amount and a target value, and (iii) to output the controlled variable; and a generation unit configured to generate the rotation amount based on a difference value between two average values, one being an average value of detection values that are obtained by the first interferometer between a first measurement timing and a second measurement timing, immediately after the first measurement timing, and the other being an average value of detection values that are obtained by the second interferometer between the first measurement timing the second measurement timing, and to output the generated rotation amount to the control unit at the second measurement timing.