| 摘要 |
<p>By obtaining a two-wavelength optical device which can cancel the optical-path difference due to the difference of the wavelengths occurred when two wavelength elements are integrated in one unit, the deterioration of a reproduction signal of an optical disk which may be produced by the optical-path difference is suppressed. In a two-wavelength optical device ( 1 ) for reading from and writing to an optical disk and including a plurality of light emitting elements ( 3 ), ( 5 ) for emitting laser lights ( 17 ) having different wavelengths to the optical disk, and a light receiving element ( 13 ) for receiving a return light from the optical disk, the respective light emitting elements ( 3 ), ( 5 ) are arranged at relative positions where the optical-path difference appears due to the difference between the different wavelengths, is cancelled.</p> |
