| 摘要 |
PURPOSE:To provide a small and thin optical pickup device. CONSTITUTION:A Wollaston prism 10 is formed of a rutile crystal and arranged between a condenser lens 7 and a photodetector 15. In this case, the Wollaston prism 10 composed of a rutile crystal may be joined to the incident plane 15a of the returned light beam from the photodetector 15. The Wollaston prism 10 is formed of a rutile crystal and also joined to the exit plane 4a of the returned light beam from a beam splitter 4. |
