Optical pickup system for an optical disc player

摘要

An optical pickup system is provided for two kinds of discs which are different in thickness. A rack is provided to be moved in the radial direction of the disc beyond a reproducing stroke area of a pickup to over-stroke areas at opposite sides of the reproducing stroke area. Two optical elements are provided to be moved together with the rack for changing the condensed positions of laser beam for performing reproduction of the discs. The pickup and the rack are detachably engaged in the reproducing area and in the over-stroke areas, respectively. The rack is moved to the opposite over-stroke areas by a motor. A pair of stoppers are provided for stopping the pickup at opposite ends of the reproducing stroke area so that relative positions of the pickup to the rack are changed in the over-stroke area, respectively. The optical elements are arranged to effect the reproduction of a corresponding kind of disc based on the change of the relative position of the pickup.