INRICHTING VOOR HET LANGS OPTISCHE WEG UITLEZEN VAN EEN STRALINGSREFLEKTERENDE REGISTRATIEDRAGER.

摘要

An apparatus is described for reading a radiation-reflecting record carrier on which information is stored in an optically readable structure. For separating the modulated and the unmodulated read beam, the radiation path from the radiation source to the record carrier includes a beam-splitting element with such a reflection coefficient that only a small part of the modulated read beam returns to the radiation source, while a sufficiently large part of said beam reaches a radiation-sensitive detector.