Appeal No. 96-3614
Application 08/259,154
electrical potential as the substrate, there is no danger of
an electric discharge between the recording medium and the
pole portions 211 and 221 of magnetic films 21 and 22 (Spec.
at 10, line 20 to p. 11, line 7). The use of organic
insulating resin films 251-253 around the coil film 23
provides sufficient insulation even though the lower magnetic
film 21 is in contact with the substrate (Spec. at 11, lines
10-15).
In the third and fourth embodiments (Figs. 5 and 6), the
lower magnetic film 21 makes electrical contact with the
substrate 111 through a hole 121 in the substrate-insulating
film 112, 122, thereby keeping the lower and upper magnetic
films 21 and 22 at the same potential as substrate 111 (Spec.
at 13, line 25 to p. 15, line 1). In the Figure 5 embodiment,
the upper surface of yoke portion 212 of lower magnetic film
21 is "stepwisely depressed" relative to the pole portion 211
as a result of the yoke portion dipping into the hole 121 in
the substrate-insulating film 112, 122. In the Figure 6
embodiment, on the other hand, the yoke portion 212 of
magnetic film 21 is thicker in the region of the hole 121 so
that the upper surface of the yoke portion is "flush," i.e.,
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Last modified: November 3, 2007