Appeal No. 1998-1658
Application 08/343,876
magnetic flux density material on the leading gap edge as recited
in claims 1 and 8. Accordingly, the rejection of claims 7 and 14
is reversed.
Issue (3): Claims 1, 4-6, 8, and 11-13
Shimizu '178 and Shimizu '645
The contents of Shimizu '178 are discussed under Issue (1).
Shimizu '645, figure 1, discloses a MIG head having magnetic
core halves 11a and 11b of Mn-Zn ferrite with first ferromagnetic
metal thin films 13a and 13b of high saturation flux density
material, such as Fe-Si-AD, on the core halves opposing each
other to form the gap 12 and second ferromagnetic metal thin
films 17a and 17b, such as Fe-Si-A D alloy of different
composition, on the first ferromagnetic metal thin films 13a and
13b (col. 4, lines 20-44). The first ferromagnetic metal thin
film may be sendust (col. 8, lines 49-53). The ratio B S2/BS1 of
the saturation flux density B S2 of the second ferromagnetic thin
films 17a and 17b to the saturation flux density B S1 of the first
ferromagnetic metal thin films 13a and 13b should be less than
0.6 (col. 2, lines 59-61; col. 5, lines 16-26 and 45-48; col. 7,
lines 10-18). Shimizu '645 discloses that the first and second
ferromagnetic metal thin films 13a and 17a may be formed on only
one magnetic core half 11a, as shown in figure 8 (col. 8,
lines 16-21). Shimizu '645 does not disclose the direction of
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