Optical disc apparatus with access system having object lens control

DETAILED DESCRIPTION It is an object of this invention to provide an access system which can remove the vibration of the object lens in the tracking direction which occurs upon movement of the pickup.
It is another object of this invention to provide an optical disc driving apparatus which can prevent the vibration of the object lens mounted on the pickup by detecting the position of the lens without addition of the position sensor to the actuator.
The number of additional circuits are desired to be as small as possible.
According to this invention, together with the access operation of the lens made under the condition in which the tracking servo is cut off once, the light beam projected on the optical detector, when moved due to the inertia of the lens and the actuator having the lens mounted thereon, is detected and thereby the tracking servo system is operated to actuate a servo for prevention of vibration of the object lens.
The optical detector is divided at least in connection with the information tracks into sub-detectors which are arranged apart from the conjugate point relative to the image of the disc track so that the displacement of the lens is detected by using the movement of the beam associated with the displacement of the lens in the tracking direction on the detector.