Patent ID: 8363127

Claim:
A movement signal generation apparatus which generates a signal representing a movement of an optical adjustment unit, comprising: an analog signal output section which outputs analog signals with two phases in accordance with a position of the optical adjustment unit; and a digital pulse train signal generation section which generates two digital pulse trains signals in accordance with a movement amount and a movement direction of the optical adjustment unit based on the analog signals, wherein the digital pulse train signal generation section generates the two digital pulse trains signals based on a difference between a first analog signal input from the analog signal output section and a second analog signal input after the first analog signal, wherein updated pulse values for the two phases are determined based on current pulse values of the two phases, if an output pulse number is positive, then the updated pulse values are selected from a table including a plurality of current pulse values of the two phases, if the output pulse number is negative, then the new pulse values are selected from a second table including a plurality of current pulse values of the two phases, then the new pulse values are output for the two phases.