| 摘要 |
<P>PROBLEM TO BE SOLVED: To attain miniaturization by decreasing constitution members, and further to perform stable accuracy adjustment. <P>SOLUTION: A laser beam having long wavelength is transmitted through a slope of a first BS3A, a laser beam having short wavelength is reflected by the slope of the first BS3A, and they are emitted to the same optical path for the first BS3A distant from an optical disk 6 as P polarization in two kinds of laser beams having different wavelength. The P polarization emitted from the first BS3A is transmitted through the slope of a second BS4 near the optical disk 6, so as to irradiate the optical disk 6. An S polarization component being reflected light from the optical disk 6 is reflected by the slope of the second BS4 and guided to a light receiving element 5A. <P>COPYRIGHT: (C)2007,JPO&INPIT |
