Patent ID: 7821887
Filing Date: 2010-10-26
Classification: G11B

Abstract:
1. A method for adjusting a tilt of an optical pickup head by turning adjustable screws of the optical pickup head according to an image including a first static spot, a second static spot, and a dynamic spot formed by three reflected light beams reflected from three reflecting planes respectively, the method comprising: recording initial coordinates of the first static spot, the second static spot, and the dynamic spot in an image generated from three reflected light beams from the optical pickup head; turning one of the adjustable screws a predetermined calibrated rotation angle θ1; recording current coordinates of the first static spot, the second static spot, and the dynamic spot in another image generated from three reflected light beams from the optical pickup head; computing a total needed rotation angle of the one adjustable screw according to the initial coordinates, the predetermined calibrated rotation angle, and the current coordinates; and turning the one adjustable screw a remaining rotation angle computed by subtracting the predetermined calibrated rotation angle from the total needed rotation angle.