Optical disc device, optical disc and testing method of optical disc

Abstract

An optical disc device uses an optical disc () capable of super-resolution reproduction, and includes a semiconductor laser (), a laser driving circuit () that supplies a driving current to the semiconductor laser, a light receiving element () that detects return light from the optical disc () and obtains reproduction signal of recording data of the optical disc (), and a light emission amount control means () that controls a light emission amount of the semiconductor laser () by the laser driving circuit () so as to keep a peak intensity of a focused light spot formed on an information recording layer of the optical discto be greater than or equal to a peak intensity at which a super-resolution effect is obtained. The light emission amount control means () controls a light emission amount of the semiconductor laser () by the laser driving circuit () based on a decrease rate D of a peak intensity of a focused light spot on an information recording layer of the optical disc () determined by an assumed disc tilt and a comatic aberration according to a thickness of a light transmitting layer of the optical disc (), and a lower limit value Pld_L of a light emission amount at which a predetermined reproduction performance is obtained.