Patent ID: 7397737

Claim:
The output adjustment method for a lens position sensor of an optical disk device for detecting a position of an objective lens that can move in a track direction of an optical disk, comprising the steps of: measuring an output of said lens position sensor when said objective lens positions at a neutral point and the output of said lens position sensor when said objective lens moves to left and right movable limit positions at a reference time; calculating an output ratio at said neutral point to be a reference from said measured outputs when said objective lens moves to the left and right movable limit positions; measuring the output of said lens position sensor when said objective lens moves to the left and right movable limit positions during usage of the device; and calculating the output level of said lens position sensor corresponding to said neutral point when said objective lens moves to the left and right movable limit positions during usage from said measured output and said calculated output ratio at said neutral point, and wherein said measurement step further comprises a step of measuring the output of said lens position sensor with a focus adjustment position of said objective lens secured.