| 摘要 |
A single optical pick-up apparatus is provided with two semiconductor lasers (5A, 5B) emitting laser beams having different wavelengths, a prism (3) having inclined surfaces (3A, 3B) facing to the semiconductor lasers, optical systems (6A, 6B) for image-formation, and photo-diodes (2A, 2B) receiving laser beams entering the prism through the inclined surfaces. The prism (3) and the photo-diodes (2A, 2B) can be shared by optical pick-up units comprised of the semiconductor lasers (5A, 5B), which ensures the reduction in the number of parts, specifically, of prism and photo-diode and hence the reduction in costs for fabrication of an optical pick-up apparatus, and also ensures a smaller size and reduction in weight. <IMAGE> |
