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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view of a conventional speaker, FIG. 2 is
a plan view of a diaphragm, FIG. 3 is an embodiment of the speaker of the present invention, FIG.
4 is another embodiment, and FIG. FIG. 4 shows the output sound pressure frequency
characteristics of the loudspeaker according to FIG. 3;
DETAILED DESCRIPTION OF THE INVENTION The present invention is a flatbed drive
loudspeaker, more specifically JIK is a diaphragm made of a nonmagnetic material having a
series of conductors, and opposed to each other with a slight gap on both sides of the diaphragm.
The present invention relates to a speaker including a plurality of magnetic poles, and it is an
object of the present invention to improve frequency characteristics by making one magnet
smaller than the height of the other magnet. For example, a known flat drive speaker has a
structure as shown in FIG. 1 (1), in which (11 is a diaphragm made of a thin film of nonmagnetic
material, (2) and (3) are A plurality of permanent magnets are disposed opposite to each other
with a slight gap on both sides of the diaphragm, and the adjacent magnetic pole faces have an
alternately different polarity with respect to the vibration [K, and through the diaphragm The
opposing pole faces are arranged to have the same polarity. (4) is at least one conductor coil
printed on the above-mentioned diaphragm between adjacent magnetic poles, and this coil (4)
has one parallel conductor portion as shown in FIG. It has a zigzag shape. (5) and (6) are yokes,
and an acoustic hole (7) is provided between the magnets of the yoke (6). The broken line
indicates the distribution of magnetic flux. In the above-described electrodynamic planar drive
type speaker, since it is necessary to balance the magnetic forces of the facing permanent
magnets (2) and (3), conventionally, rod-like ferrite magnets of the same size (volume) are used.
However, in order to achieve regeneration efficiency, it is desirable for K to have a large volume
of this permanent magnet. (2) However, in order to round the permanent magnets (2) and (3)
sufficiently large in order to make the acoustic holes (7) necessary, the height must be
necessarily increased. . In that case, since the permanent magnets (2) and (3) disposed adjacent
to each other and the acoustic through hole (7) interact with each other to form a cavity (8) to
produce a resonance phenomenon, as shown in FIG. As shown in H), the peaks and valleys leak
out to the reproduction frequency characteristic in the high range, and the reproduction
conversion of good quality can not be performed. The present invention has been provided to
ameliorate the above drawbacks. Next, an embodiment of the present invention will be described
with reference to the drawings. FIG. 3 shows an embodiment of the speaker of the present
invention, and the height of the permanent magnet (2) is formed smaller than the height of the
same (3). As a result of the applicant's trial production of the speaker of this type, it is
ascertained that the reproduction frequency characteristic is flat and extends to a sufficiently
high frequency, as shown in sags (b) K, because the above-mentioned cavity resonance
phenomenon is avoided. The (3) In this case, the opposing magnetic forces become unbalanced,
but if a permanent magnet with high coercivity and energy product is used as the permanent
magnet (z) like a rare earth cobalt magnet, the permanent magnet (2 It was possible to reduce
the height of the), ie its volume, to balance the opposing magnetic forces even if it were a good
FIG. 4 shows another embodiment, and according to this structure, the ferrite magnet (3)
disposed on the back of the diaphragm (3) is adjacent to increase the energy product, while the
sound of the diaphragm is increased. It is possible to reduce the volume of the permanent
magnet (2) arranged on the emitting surface and to make the cavity (8) smaller without changing
the flux density crossing the coil. As described above, according to the speaker of the present
invention, of the facing 2 II permanent magnets (2) and <ti, the radius of (2) located in the blue
tatami through hole (7) is greater than (3) Lowering K can prevent the cavity resonance
phenomenon and effectively alter the reproduction frequency characteristics.
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