Appeal No. 2002-0852
Application 09/466,322
a base plate 13 is formed in an elongated oval track-shape. See
page 7 of Appellant’s specification. The pole piece is made in a
circular shape in its section, the cross sectional area S of the
pole piece 10 is made to be equal to the circle of a diameter
more than 1/3 with respect to the minor axis side length a, so
that no magnetic saturation will occur. Thus, the magnetic
efficiency can be improved. See page 8 of Appellant’s
specification.
Appellant’s claim 1 is reproduced as follows:
1. An elongated oval track-shaped loudspeaker wherein a
voice coil wound on a bobbin is disposed in a magnetic gap
between a pole piece and a plate on a magnet disposed around the
pole piece, an elongated oval track-shaped diaphragm is joined to
the voice coil bobbin supported through a damper to a frame, the
pole piece is track-shaped to elongate along major axis of the
track-shaped diaphragm, the voice coil bobbin in the gap as well
as the magnet disposed around the pole piece are track-shaped,
the damper supporting the voice coil bobbin is track-shaped at
inner and outer peripheries, and a cross sectional area of the
track-shaped pole piece is made to be equal to that of a circle
of a diameter more than 1/3 of a minor axis side length of the
loudspeaker so that no magnetic saturation will occur even with
the magnet made larger and a magnetic efficiency can be elevated.
Reference
The reference relied on by the Examiner is as follows:
Yoshida 62-143398 Sept. 10, 1987
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