| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical pickup device, focus adjusting method, and optical disk device which eliminate stray light effectively with a simple configuration and correct spherical aberration smoothly. <P>SOLUTION: The focus adjusting method changes the traveling direction of light beams in four light beam areas A to D set around a laser beam axis out of the laser light reflected by a disk and mutually disperses the light beams of the light beam areas A to D. A signal light area including only signal light appears in a detecting plane of a light detector, and a sensor pattern is set in the area while the sensor pattern for detecting the spherical aberration is set on the inside of the area. Therefore, the influence of the stray light is eliminated and the spherical aberration can be detected. <P>COPYRIGHT: (C)2010,JPO&INPIT |
