Appeal No. 1997-2848
Application No. 08/444,106
The claimed invention relates to a magnetic recording and
reproducing system utilizing a magnetic disk and a ring
recording head. The size of the gap of the head is defined in
terms of the track widths and the coercive force of the
magnetic recording medium. More particularly, Appellants
indicate at pages 7 and 8 of the specification that the gap
size is selected so that a generated side fringe magnetic
field erases unwanted signals without erasing data on adjacent
tracks.
Claim 1 is illustrative of the invention and reads as
follows:
1. A magnetic recording/reproducing system comprising:
a magnetic head member including a ring recording head
having a magnetic gap length g and a recording track width Tw
and a reproducing head having a reproducing track width Tr;
and
a rotatable magnetic recording disk having recording
tracks recorded and reproduced by said magnetic head member,
wherein said magnetic gap length g is expressed by the
following inequalities:
g < (1500/Hc - Hc/4000B + 0.3)/(Hc/400B - 1/2) and
g > (1500/Hc - Hc/4000B + 0.3 - Tp + Tw) /Hc/400B - 1/2),
2
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