Appeal No. 2002-0816
Application No. 09/442,895 Page 11
by an adhesive. As illustrated in figure 1, arrangement 28
includes a number of adjacent circumferentially arranged field
magnet segments for producing alternately polarized radially
directed fields; i.e., each magnet segment is permanently
magnetized with a polarity that is opposite from adjacent field
magnet segments (col. 2, lines 36-44). Carrier further discloses
(col. 2, lines 43-47) that “[t]hese magnet segments may be
discrete elements, but are preferably formed in an integral
cylindrical body of a hard magnetic material such as ceramic, as
is well known in the art.” The motor has a speed detecting means
including an FG magnet arrangement 32, which includes N adjacent
circumferentially arranged FG magnet segments for producing
alternatively polarized axially directed fields, as illustrated
in figure 1 (col. 3, lines 6-11). In addition (col. 3, lines 11-
16) “[a]s in the case of the field magnet arrangement, the FG
magnet arrangement may be formed of discrete magnet elements, but
preferably the magnetic segments are formed in an integral body
of hard magnetic material such as ceramic. The number N
determines the maximum accuracy at which the rotor speed may be
measured.” From the disclosure of Carrier, we find that both the
field magnet and the FG magnet 32 should be made of plural
segments having alternating polarity, and that the larger the
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