摘要 |
A video recorder-playback machine is provided for recording and or playing back video information from an information disc. The machine includes a <<write>> laser (16) and a <<read>> laser (80) respectively for generating record and playback optical beams (11, 81) which are focused upon the disc by an optical record-playback head (34). An optics carriage (30) movably positions the head with respect to the disc in moving optical alignment with the <<write>> laser and carries the <<read>> laser in fixed optical alignment with the head. The machine includes apparatus (92, 96, 98, 99) for monitoring the record optical beam during operation in a record mode, and for substantially simultaneous operation in a playback mode to monitor the playback optical beam during the recording process. |