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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a conventional ribbon-type
magnetic circuit, FIG. 2 is a cross-sectional view of the same, and FIG. 3 is a cross-sectional view
of a ribbon-type magnetic circuit according to the present invention. 10 is a ribbon diaphragm,
11 is a film, 11a and 1 lb are conductors formed on both sides of a thin film 11, 12 is a
diaphragm clang, and 13 is a magnetic pole. Figure 1 Figure 2 Figure 3 = 61
DETAILED DESCRIPTION OF THE INVENTION The present invention extends to ribbon type
magnetic circuits such as ribbon type speakers and microphones. A front view and a cutaway
view of a magnetic circuit (hereinafter referred to as a ribbon type magnetic circuit) of an 11iW
and t # Jlrt ribbon speaker, 1 is a vibrating ribbon clamp for fixing a ribbon vibrating rod, twowire ribbon vibration 1il 114k The sFi magnetic pole requires an extremely repulsive magnetic
field to increase the at-rate in this magnetic circuit. 111 L after driving the cuff, etc. (■ B:
magnetic flux density of the gap l: effective length of the conductor, in this case the length of the
diaphragm in this case) t: obtained by the 1ss which is finished with the conductor ribbon In
order to increase the efficiency of the mold magnetic circuit, it is sufficient to increase the
magnetic flux S degree B of the gap in equation 0 or to lengthen the length of the diaphragm.
However, increasing the magnetic flux greatly increases the size of the magnet or increases the
cost. If this is the case, although it is preferable that the effective length of the diaphragm be
increased, if the length is increased as it is, the width of the magnetic pole will be proportional
and the standing wave is likely to strike the diaphragm or the diaphragm. The non-invention is to
provide a ribbon type magnetic path in which only the effective length is increased without
changing the length of the ribbon 1114. FIG. 8 is a cross-sectional view of an embodiment of the
present invention, and FIG. As shown in FIG. 2I, a conductor 111.11t + is formed by free shipping
on the # surface of a thin film 11 11 such as a ribbon f111IIl plate Bh plastic or the like of an
unintended ribbon type magnetic circuit. Then, these conductors 1111sllb are connected to each
other by a straight line [K connection, so that a reconnaissance is supplied in series to (two
conductors 11asl11). Reference numeral 12 denotes an imaging plate clamp, and reference
numeral 18 denotes a magnetic pole. Due to the above construction, the length of the ribbon
plate is the same as that of the conventional one, and the effective length of the conductor which
cuts the inside of the magnetic flux is 2 恰 and the efficiency of the magnetic circuit is increased
by the magnet size. It can be raised without. It is to be noted that the present invention O-type
magnetic circuit can be used not only for the speaker but also for the microphone 07, of course.
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