| 摘要 |
<p>A bar-shaped grating beam-splitter 10 is used for the generation of focus error, tracking error, forward sense and high frequency signal. The beam-splitter is made in bars (40) and is secured to wafer consisting of a plurality of detector chips (14). Securing the bar in position is preferable to securing separate grating beam-splitters individually. Individual light detector grating units are then separated from the wafer.</p> |
