Patent ID: 7221985

Claim:
An on-screen calibration system for a disc drive having a stage driven by a spindle motor, comprising: a mirror disposed on the stage; a monitor; an on-screen display module connected to the monitor; an autocollimator, connected to the on-screen display module and disposed over the mirror for detecting an inclined angle of the stage, wherein the monitor displays a moving point according to the inclined angle through the on-screen display module; a control module, connected to the on-screen display module and having a predetermined inclined angle recorded therein, wherein the control module computes a position data of a target point according to the predetermined inclined angle; and a tilt-adjusting mechanism for adjusting the inclined angle of the stage, wherein the moving point and the target point are displayed on the monitor at the same time, and the tilt-adjusting mechanism adjusts the inclined angle of the stage until the moving point and the target point overlap.