DRIVE UNIT FOR OPTICAL RECORDING MEDIUM

摘要

PROBLEM TO BE SOLVED: To obtain good properties during recording and reproduction or for different kinds of optical recording media and each recording surface of a multilayer optical recording medium by using a light source with a sufficient manufacturing characteristics or a light source with smallish light output rating which can reduce the output power ratio of the light source.

SOLUTION: The intensity of luminous flux emitted from an optical head 104 onto the optical recording medium 102 is controlled with optical coupling efficiency variable elements 214 and 215 in accordance with the kind of the optical recording medium 102, the recording surface in the multilayer optical recording medium and an operation mode. This changes greatly the intensity of the luminous flux emitted onto the optical recording medium 102 without extremely augmenting the output power ratio of the light source 212.

COPYRIGHT: (C)2003,JPO