Appeal No. 96-3614
Application 08/259,154
substrate-insulating film 102, whose 0.5 Fm - 3 Fm thickness
allows enough leakage current to flow therethrough to reduce
the possibility of an electric discharge between the magnetic
medium (not shown) and the pole portions 211 and 221 of the
lower and upper magnetic films 21 and 22, respectively (Spec.
at 7, line 17 to p. 8, line 5).
Disposed on the top surface of lower magnetic film 21 is
an insulating film 24 (hereinafter gap-insulating film) which
provides the gap between the yoke portions 211 and 221 of the
magnetic films (Spec. at 6, line 26 to p. 7, line 1). The
coil film 23 is surrounded by insulating films 251-253
(hereinafter coil-insulating films), which may be a made of an
organic resin such as novolak resin (Spec. at 7, lines 4-9).
The use of an organic resin as the coil insulation material
ensures that the "electrical insulation required for the coil
films is sufficient even though the thickness of the
insulating film 102 is thin" (Spec. at 8, lines 9-14).
The second embodiment, shown in Figures 3 and 4,
eliminates the substrate-insulating film 102 and has the lower
magnetic film 21 deposited directly on substrate 101. Because
the lower and upper magnetic films thus are kept at the same
- 3 -
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Last modified: November 3, 2007