Patent ID: 7020059

Claim:
An adjustment method for an optical pick-up with a device including an optical pick-up having a light source for emitting light beams and an object lens for irradiating light beams onto an adjustment optical disc assembled on a base unit including a slide base for supporting the optical pick-up, a guide shaft for movably supporting the slide base, a movement mechanism for moving the slide base in a radial direction of the adjustment optical disc and a disc rotation drive mechanism for rotationally driving the adjustment optical disc, said method comprising irradiating light beams from the optical pick-up onto the adjustment optical disc, the adjustment optical disk having concentric recording tracks, to adjust a relative position of the object lens with respect to the light source and an inclination of the optical axis of the object lens; and setting a relative position of the object lens with respect to the light source, and setting an inclination of the optical axis of the object lens with a recording track at a middle position in the radial direction of the adjustment optical disc, such that phase differences of the ±1-st order light at the innermost circumferential side and the outermost circumferential side of the adjustment optical disc become substantially equal to each other being as reference.