Optical storage apparatus

摘要

An optical information apparatus consists of a semiconductor laser, a convex lens, a driving mechanism for rotating an information medium, an external electric source for supplying power to the driving mechanism, a refractive type objective lens for converging the light beam on the information medium in which information is stored, a photo detector for detecting intensity of the light beam converged to obtain an information signal and servo signals, a circuit for generating a control signal according to the servo signals, an actuating unit for moving the objective lens according to the servo signals and an element to correct chromatic aberration of the objective and convex lenses, said element interposed between the convex lens and the objective lens to be apart from the convex lens.