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DESCRIPTION JPS56165493

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DESCRIPTION JPS56165493
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
loudspeaker utilizing transverse vibration of an accordion-like vibrating membrane, and FIG. 2 is
a schematic view of the vibrating membrane. FIG. 3 is a simplified cross-sectional view of an
embodiment of the present invention. FIG. 4 is a simplified perspective view of another
embodiment according to the present invention. FIG. 5 is a perspective sectional view of still
another embodiment according to the present invention, and FIGS. 6a, 6b and 6c show the
printing method of the voice coil. 1 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
angle iron, 5 · · · · · · · · · · · · · · · · ...... .... yoke, 12 ...... sound emission hole, 13 ...... magnets, 14 ......
voice coil, 15 ...... vibration film, 16 ... · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
Sound emission hole.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of a speaker of the type that emits an acoustic wave by means of a vibrating membrane having
an accordion shape and a voice coil printed thereon. Conventionally, in this type of loudspeaker,
a voice coil is embedded in a vibrating membrane, a magnetic circuit is formed so that magnetic
lines of force cross the front surface to the rear surface of the vibrating membrane, and the
diaphragm of the vibrating membrane is driven electromagnetically. FIG. 1 is a cross-sectional
view of a prior art transducer, and FIG. 2 is a schematic illustration of a vibrating membrane as
well. In FIG. 1, 2 is a magnet, 6 is a stack which induces a magnetic loop, 4 is an angle iron, and 5
is a frame. Further, in FIG. 2, 6 is an accordion-like diaphragm, and 7 is a voice coil printed
thereon. Since the signal current flows through the wired voice coil as shown in FIG. 2, the
adjacent voice coil is driven in the opposite direction (2) →, and the air contained in the fold is
released according to the bellows principle. And inhaled to generate sound waves. However, in
the magnetic circuit having the above-described structure, a large magnet is essential in terms of
structure, and it is therefore difficult to make the unit thinner, smaller, lighter, and less
expensive. The object of the present invention is to eliminate the drawbacks as described above,
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and in particular to realize a thin unit. An embodiment of the present invention will be described
with reference to the drawings in FIG. 3. FIG. 3 is a sectional view of the embodiment of the
present invention. 8 is an accordion-like vibrating membrane on which a voice coil 9 is printed,
and 10 is a rectangular rod. A magnet 11 is a yoke having an air flow hole 12. In FIG. 3, the lines
of magnetic force pass from the top to the bottom of the vibrating membrane as shown by the
dotted lines, so that the separated voice coils are printed as shown in FIG. 2 and thus driven in
opposite directions. It is generated and emitted from the air holes 12. (8) FIG. 4 is a simplified
perspective sectional view showing another embodiment of the present invention, in which B is a
pair of magnets having a large number of sound emission holes and magnetized in the thickness
direction. Magnetic field lines are generated as indicated by dotted lines. Also in this
embodiment, a sound wave is emitted on the same principle as described in FIG. That is, the voice
coil that is homologousized by the voice signal being input to the voice coil 9 printed on the
vibrating membrane 8 disposed in the magnetic field operates in opposite directions together
with the vibrating membrane, so that the air is compressed between the folds of the vibrating
membrane. Sound waves are generated by inhalation and release. The generated sound waves
are emitted from the front and rear sound emission holes, but it is also considered that the holes
on the rear surface are filled with a sound absorbing material to prevent interference.
FIG. 5 is a perspective sectional view of still another embodiment of the present invention, and
FIG. 6 is an embodiment of a printing method of a coil printed on the vibrating film. In FIG. 5, the
vibrating membrane 15 on which the voice coil 14 is printed has a shape having concentric folds,
and the way of printing the voice coil is considered to be several types as shown in the sixth [4].
E16 is magnetized in the vertical direction by the annular magnet pair (4), l ′ ′ and is opposed
to the vibrating film with the air gap interposed therebetween. Reference numeral 17 denotes a
yoke having a sound output hole 18. Since magnetic lines of force as shown by dotted lines are
generated by the ring-shaped magnets facing up and down, when the coil of the vibrating arms in
the radial direction is printed as shown in FIG. It generates sound waves as well. Also in this case,
it is also conceivable to fill the upper and lower holes with the sound absorbing material. As
described above, according to the present invention, a thin speaker can be realized because only
the height of the waves of the magnet and the vibrating film contributes to the thickness in
shape, and the size can be reduced by configuring the magnetic circuit according to the
application. And weight reduction can also be realized.
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