Apparatus and method for automatically adjusting tilting of an optical disc drive

A method of automatically adjusting tilting of an optical disc drive in which tilting is measured between an optical pickup unit sliding along a pair of rails supported by three adjusting parts and one fixed part, and a turntable on which the optical disc drive is placed, the method comprising:

• adjusting the pair of rails to be parallel;
• radiating a plurality of parallel light beams, using an autocollimator, onto
• a mirror disc that is mounted on the turntable and spins, and
• two mirror plates that are installed on the pair of rails;
• calculating an amount of tilting from focused points of light beams reflected from the mirror disc and the mirror plates and passing through the autocollimator;
• and
• adjusting the adjusting parts according to the amount of tilting.

An apparatus for adjusting tilting of an optical disc in which tilting is measured between an optical pickup unit that slides along a pair of rails that are supported by three adjusting parts and one fixed part, and a turntable on which an optical disc is placed, the apparatus comprising:

• a base with placing parts, on which the optical disk is placed;
• at least one height measurer that measures the heights of at least two portions of each of the pair of rails relative to the base;
• at least one adjuster that adjusts the adjusting parts;
• a mirror disc that is mounted on the turntable
• a plurality of mirror plates that are installed on the pair of rails;
• an autocollimator that radiates parallel light beams onto the mirror disc and the plurality of mirror plates;
• a photo detector that detects focused points of the light beams reflected from the mirror disc and the plurality of mirror plates;
• and
• a controller that determines an amount of tilting from a distance between the focused points.

A method of measuring tilting of a turntable of an optical disc drive relative to a pair of guide rails of the optical disc drive, comprising:

• radiating a plurality of parallel light beams, using an autocollimator, onto
• a mirror disc mounted on the turntable, and
• two mirror plates that are installed on the pair of rails;
• calculating an amount of tilting from focused points of light beams reflected from the mirror disc and the mirror plates and passing through the autocollimator.