Appeal No. 1997-0907
Application 08/291,642
18 and peripherally outside of the rotor 24. Annular bias
magnet 30 is clearly separate from the yoke or stator housing
in this reference in the manner claimed and in a manner
consistent with the showing in appellants' disclosed Figure 4
for the bias magnet 8 as it relates to the movable magnet 16.
The bias magnet 30 in Wang causes the rotor 24 to assume a
home position established by the bias magnet 30 as illustrated
in Figure 3A and Figure 4A.
On the other hand, Shimada utilizes similar language
which would have suggested a stepper motor. The abstract at
lines 3 and 4 state "[r]eciprocative rotating electromagnetic
drive sources with stators and rotors reciprocate the shutter
blades." The abstract goes on to illustrate that magnetic
members on the stator itself facing the rotors hold the rotors
at positions corresponding to the blades' start positions and
are therefore movable to vary the gaps formed between the
rotors and the adjustable magnetic members. What is
significant as well about Shimada is that it teaches in a
single reference a stepper motor- like structure for
controlling shutter blades in a camera with the need for a
home position holding mechanism of a magnetic nature to
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