| 摘要 |
<p>A composite photo-sensitive diode array (14 in Fig. 5). Four individual photo-detectors (37, 38, 39, 40) and two photo-detector quad arrays (41, 42), each consisting of four photo-detectors arranged in a rectangular shape, are precisely located on a single semiconductor chip. The photo-detectors receive spots of light reflected from the surface of a rotating disk (1) in an optical disk storage system and are used to provide radial and tangential tracking for the read/write head, focus the read spots and write beam, read after writing, and to read data.</p> |
