| 摘要 |
In the helical scan recorder, the carrier (30) is unwound from a supply reel (1) to a take-up reel (14) in a cassette (15), past two capstans (16, 17) and two tensioning rollers (22) which pivot (20, 21) into their working positions (4, 5) as the capstans (16, 17) are translated (18, 19) into contact with the rotating drum (11), or into an intermediate position for fast rewinding. Tension is maintained constant by guides (8, 9). Track-scanning errors arising from different speeds of recording and reprodn. are corrected by modification of the angle of winding on the drum
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