Patent ID: 7180836

Claim:
An apparatus for automatically adjusting tilting between an optical pickup unit of an optical disc drive, sliding along a pair of rails supported by three adjusting parts and one fixed part, and a turntable on which an optical disc is placed, the apparatus comprising: a base; placing parts connected to the base, on which the optical disc drive is placed; a plurality of height measurers that measure heights of two portions of each of the pair of rails relative to the base; adjusters that adjust the adjusting parts; a mirror disc mounted on the turntable and spins; two mirror plates installed on the pair of rails; an autocollimator that radiates parallel light beams onto the mirror disc and the two mirror plates; a photo detector that detects focused points of the light beams reflected from the mirror disc and the two mirror plates and passing through the autocollimator; and a controller that calculates an amount of tilting from a distance between the focused points.