Pick-up device positioning arrangement in an information disc player

摘要

An information reading and reproducing apparatus in which a recording disc having an information-carrying face formed with recorded tracks is to be driven for rotation and which includes drive means operative to drive a signal pick-up means for movement radially of the disc at a velocity controlled by a velocity control device and to produce signals indicative of the locations of the pick-up spot relative to the tracks on the disc in a radial direction of the disc, the velocity control device comprising velocity detecting means operative to extract from said signals information indicative of the velocity of movement of the signal pick-up means with respect to the disc.