| 摘要 |
<p>PURPOSE: To improve light efficiency of a recordable optical recording medium and to prevent deterioration of reproduction performance and recording performance in relation to a second optical recording medium for the light efficiency in an information processor using a plurality of optical recording media. CONSTITUTION: An optical head device is provided with a light emitting source 23 that emits laser beams of a plurality of different wavelengths and an optical system including an objective lens 12 and a collimator 13. In the optical system shared in different types of optical recording media, the outermost intensity of the emission is specified to be >=0. 1 and a scale factor is specified to >=4 and <=6. By limiting the outermost intensity of the emission and the magnification, light efficiency is secured when recording a CD, the quality of an optical spot is guaranteed to reduce the influences to DVD playing and recording.</p> |
