Appeal No. 1998-2591 Page 3
Application No. 08/636,304
In contrast, the appellants' invention includes a pair of
playback heads Al and A2, which are mounted at the same
azimuth angle 2 and are angularly spaced from each on a rotary
head drum, e.g., by 12.8 degrees. A recording track T1 is
recorded on the tape in a helical scanning method by a
recording head REC(A); a recording track T2 is recorded on the
tape in the helical scanning method by a recording head
REC(B).
Each playback head has a width Wl1 that is 1.5 times
wider than the width W2 of the recording heads. Furthermore,
playback head A2 is positioned higher than playback head Al,
thereby forming a gap of about 1 track pitch TP, which is
approximately equal to the track width W2. The playback
heads, therefore, overlap each other during playback of the
tape over a distance of about W2/2, or about 0.5 track pitch.
Consequently, if tracking of the playback heads A1 and A2
deviates, one of the playback heads A1 or A2 covers 75% or
more of the track width W2.
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