| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an optical axis misalignment adjustment method of two beams of laser light in a hologram device which irradiates sub-laser light different from in the wavelength of main laser light beam for recording and reproducing and performs recording and reproducing position control based on the reflected light thereof. <P>SOLUTION: One of the combined light of the branched and outputted from a means for branching and outputting the combined light of main laser light and sub-laser light is inputted and relating respectively to the main laser light and the sub-laser light, the optical axis positions are detected in a plurality of positions where an optical path difference is given. Based on the result of the detection, the position misalignment of the optical axis positions of the two beams of the laser light is determined in each of the plurality of positions and the relative position relations of the optical axes of the main laser light and the sub-laser light inputted to the means for branching and outputting the combined light and the optical axis angle difference are adjusted. As a result, the adjustment can be so performed as to align the optical axes of the two beams of the laser light and the prevention of the deterioration of the recording and reproducing performance can be achieved. <P>COPYRIGHT: (C)2009,JPO&INPIT |
