| 摘要 |
<p>A two-wavelength optical element in which an optical path difference incident to the difference of wavelength occurring when the two-wavelength optical element is integrated can be canceled and deterioration of an optical disc reproduction signal due to the optical path difference is suppressed. The two-wavelength optical element (1) for reading/writing an optical disc comprises a plurality of light emitting elements (3, 5) for emitting laser beans (17) of different wavelengths toward an optical disc, and a light receiving element (13) receiving the returning light (25) from the optical disc, wherein the light emitting elements (3, 5) are disposed at such relative positions that the optical path difference incident to the difference of two wavelengths is canceled.</p> |
