Appeal No. 1998-2591 Page 2
Application No. 08/636,304
magnetic tape is loaded onto a rotary head drum, the tape
passes over a capstan, a full width erasing head, an audio
recording/playback head, a channel erasing head, and a
plurality of fixed guides. The tape is moved helically around
the periphery of the drum. While the tape runs at a constant
speed, data thereon are recorded or played by the drum, which
is rotated at a high speed. More specifically, the drum
includes playback heads PB(A), PB(B), PB(C), PB(D) and
recording heads REC(A), REC(B), REC(C), and REC(D). The track
width Wl of the playback heads PB(A) to PB(D) is the same as
the track width W2 of the recording heads REC(A) to REC(D).
Some conventional helical scanning magnetic recording/
playback devices have servo systems for adjusting the speed of
the drum with respect to the speed of the tape. These
devices, however, require expensive servo systems having an
accurate response capability. Because an air film thickness
formed between a peripheral surface of the drum and the tape
fluctuates during rotation of the drum at different drum
speeds, insufficient contact with the playback heads PB(A) to
PB(D) sometimes results.
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