APPARATUS FOR READING A ROTATING DISC-SHAPED RECORD CARRIER

摘要

1442218 Playback of rotary-disc optical records PHILIPS ELECTRONIC & ASSOCIATED INDUSTRIES Ltd 23 Aug 1973 [26 Aug 1972] 39930/73 Heading G5R The path of a beam of radiation from a source 2, e.g. a gas laser, to a video and/or audio record disc 1 includes a beam-splitter 3 and a mirror 5, and a beam reflected by the record passes via the mirror 5 and the beam-splitter 3 to a detector 7, a second mirror 4 being located so that a beam from the source 2 reaches the first mirror 5 along a roughly U-shaped path, the U lying in a plane parallel to that of the record disc 1 and having its opening facing inwards.