Appeal No. 2004-1072 Page 11
Application No. 09/868,150
the disc-shaped armature 2 and the electromagnetic coil 5 in the direction of movement
of the armature 2).
As set forth above, it is our view that shortly before the moveable armature 2 of
Uemura reaches the end position shown in Figure 1, the electromagnetic coil 5
inherently acts on the flat portion 2a of the armature 2 by way of the ring-shaped
projection 6a of the outer yoke 6 in an effective range whereby a second magnetic flux
is formed, wherein the second magnetic flux flows through a second working air gap.
The bases for our determination that the claimed forming of a second magnetic flux is
inherent in Uemura are as follows. One, Uemura states that when the electric current in
the first direction is applied to the electromagnetic coil 5, the magnetic flux generated
thereby flows in the outer yoke 6, the flat and conical portions 2a and 2b, respectively,
of the disc-shaped armature 2, the gap 7 and the inner yoke 3, whereby the magnetic
attraction of the electromagnetic coil 5 is largely generated at the tapered portion 3a of
the inner yoke 3. Two, Uemura teaches that the gap 7 between the tapered portion 3a
of the inner yoke 3 and the conical portion 2b of the disc-shaped armature 2 forms a
magnetic path for passage of flux generated by the permanent magnet 4 and the
electromagnetic coil 5. Three, the gap 7 between the tapered portion 3a of the inner
yoke 3 and the conical portion 2b of the disc-shaped armature 2 in the broken lines
position of Figure 1 is smaller than the gap between the ring shaped projection 6a of
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