Patent ID: 7668048

Claim:
An optical head comprising: a laser light source for emitting laser light; a mirror for reflecting the laser light; a collimating lens for converting the laser light into parallel light; an objective lens for irradiating an optical disc with the laser light; a beam splitter for splitting the light reflected on the optical disc; and a light receiving element for receiving the light, wherein the collimating lens is supported by a base, the objective lens is supported by an actuator base (act base), in the act base, a plurality of through holes to engage with the base are so formed as to be in symmetry, in the base, projections are formed at positions in correspondence with the through holes of the act base in a stepped manner by coupling together a first cylinder of a larger diameter and a second cylinder of a small diameter, in a surface of the first cylinder coupling with the second cylinder, a recessed groove is formed so as to surround a portion of the first cylinder coupling with the second cylinder, and the act base is adjusted so that tilt angles of the objective lens and the optical disc fall within predetermined ranges, the through holes are engaged with the projections of the base, and an adhesive is injected to the through holes, thereby fixing the act base and the projections together.