Patent ID: 7547867

Claim:
A positioning device, comprising: a movable member moved by a-drive unit; position detecting means outputting a detection output which is maximized when the movable member is at a prescribed position; and control means which controls the drive unit corresponding to the detection output, wherein when the detection output is small, the control means performs wobbling control in which the movable member is first moved forward by only a predetermined minute amount, then backward by twice the minute amount, again forward by only the predetermined minute amount, and further moved in proportion to a difference between the detection output when the movable member is first moved forward by the predetermined minute amount and the detection output when the movable member is moved backward, and wherein when the detection output is large, the control means performs hill climbing control in which the movable member is moved in one direction by only a predetermined adjustment amount and when the detection output increases, the movable member is moved again in an identical direction by the adjustment amount.