Video 4 Electronics Nedia Engineering Lab. ,Toshiba Corp.
The recent trend toward high density VCR recording requires highly stable tape transport technology[l], [2].Tape transport stability is assured by two important factors, (1) keeping the track straight and (2) preventing tape damage. To keep the track straight, the tape transport should have a margin against dynamic changes caused by 3 dimensional position and angle error of guides. Hence, as shown in Fig.1, twist (tape tnisting caused by the leaning of any guide from the geometric center) and flange height regulation are usually introduced to maintain stable transportation along the helix guide of a stationary cylinder. Eowever, flange height regulation might cause tape damage. Therefore, it is important to optimize parmeters in controlling the twist method (e.g. helical twist: twisted by helical guide, roller twist: twisted by roller guide) and twist angle.
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