Abstract: It is an object of the present invention to adjust an optical pickup without using an optical disc. An optical axis adjusting apparatus of the present invention comprises: a light receiving unit having a half mirror surface located at a position adapted to mount an optical disc and also having a photo-detector; a signal processing unit for generating a focus error signal from a detection signal outputted from the light receiving unit, and for generating another focus error signal from another detection signal outputted from a photo-detector of an optical pickup; and a control unit for controlling the posture of an actuator of an objective lens of the optical pickup and for generating adjustment signals for adjusting the optical pickup, in accordance with the focus error signal.

Abstract: An emitted-light checking apparatus receives laser beam which has been emitted from a laser diode of an optical pickup subject to check. The laser beam travels through a cylindrical lens provided for producing astigmatism, and then enters a light receiving device that includes an optoelectronic integrated circuit having a receiving surface split into four receiving areas arranged in the upper-right, upper-left, bottom-right and bottom-let positions.