发明名称 |
Apparatus for reproducing information from an optically readable record carrier. |
摘要 |
<p>An apparatus is described for reading an optically readable record carrier in which a light beam which has been modulated by the record carrier is incident on a detector divided into four quadrants. A tracking-error signal is obtained by measuring the time intervals between corresponding zero crossings of a first signal supplied by two diagonally situated parts of said detector and a second signal supplied by the two other diagonally situated sub-detectors and/or all four subdetectors.</p> |
申请公布号 |
EP0138277(A2) |
申请公布日期 |
1985.04.24 |
申请号 |
EP19840201457 |
申请日期 |
1984.10.10 |
申请人 |
N.V. PHILIPS' GLOEILAMPENFABRIEKEN |
发明人 |
BIERHOFF, MARTINUS PETRUS MARIA |
分类号 |
G11B7/09;(IPC1-7):G11B7/095 |
主分类号 |
G11B7/09 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|