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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
transducer, and more particularly to an electric fg-mechanical vibration #J converter for
converting an electrical signal into mechanical vibration. 2. Description of the Related Art As is
shown in FIG. 3, a well-known transducer has a casing 1 having 7 flanges and a hole 2 in the
flange. One end of the moving coil bobbin 3 is adhesively fixed to 1 and the moving coil 4 is
wound around the moving coil bobbin 3. The moving coil 4 is located in the magnetic gap of the
magnetic circuit, and in the magnetic circuit, the magnet 7 is fixed to the yoke 6 having the
center pole 5, and the top plate 8 is fixed to the macnet [1. The magnetic circuit is supported by
the damper 9 on the periphery of the casing 1. In such a transducer, when the signal current is
supplied to the moving coil 4, Lorentz force is generated in the moving coil 4 in the magnetic
circuit, particularly in the space between the top plate 8 and the hinter ball 5. Since the moving
coil 4 is fixed to the casing 1, the force is applied to the magnetic circuit relatively, and acts in a
direction perpendicular to the plane including the damper 9. The magnetic circuit is suspended
from the casing 1 by the damper 9 so that the vibration of the magnetic circuit is transmitted to
the casing 1 and propagated outside. However, in such a transducer, of the source of vibration, I
:! ′F! Since the magnetic circuit itself is the most powerful one, it is necessary to generate a
force to drive its own weight by the magnetic force of the magnetic circuit itself, and even if it is
desired to obtain predetermined performance, the optimum holding power and the optimum
weight It was very difficult to obtain a magnetic circuit with both In addition, the heat dissipation
means of the magnetic circuit that easily accumulates heat is either heat dissipation by moving in
a narrow space or conduction heat dissipation by the damper, and it is necessary to construct a
so-called transducer which has a large allowable input. There were many points. Furthermore, it
is difficult to locate the center of gravity of the magnetic circuit (vibration unit) on the surface of
the support point (damper) of the magnetic circuit, and there is a disadvantage that the center
position is biased: vibration. In this case, there are many drawbacks, such as a top and bottom
asymmetry amplitude and a large distortion waveform. SUMMARY OF THE INVENTION The
object of the present invention is to solve the above-mentioned disadvantages of the prior art and
to reduce the distortion and to make the vertical vibration a symmetrical vibration.
[Technical means for achieving the object 1] In order to achieve the object as described above,
the present invention is characterized in that the vibration center of gravity, the drive center and
the support center are removed by arranging the same drive sources opposite to each other. It is
characterized in that it has a small amount of vibrational distortion that is well balanced with one
thousand [. Embodiment 1 Hereinafter, the configuration of the present invention will be
described by the embodiments shown in FIG. 1 and FIG. 2 attached. First, in FIG. 1, reference
numeral 10 denotes a casing, in which a bottom plate 12.22 with a center ball 11.21 is
integrated with each other. .23 is fixed, the top plate 14.24 is fixed to each magnet 13.23, and a
magnetic gap is formed between the slide plate 14.24 and the center ball 11.21 to form a
magnetic circuit. Is configured. Moving coils 16.26 wound around bobbins 15.25 are located on
these magnetic gear tube products, the bobbins 15.25 are fixed to the casing 10, and each
magnetic circuit is fixed by a damper 17.27. The periphery is supported by the casing 10. In FIG.
2, a drawing 110A is formed in the casing 10, and a pair of bobbins 15 ° 25 is fixed to the
drawing wall 10A! The inverted shape of the first embodiment (arranged symmetrically with
respect to both walls 10A). In the transducer configured in this way, the magnetic circuit
performs the same movement, so either input an electric signal of opposite phase to the moving
coil 18.26, or alternatively, move the winding direction of the moving coil 1t 3.26 to each other.
Use in reverse. As is apparent from the above description, the transducer of the present invention
has the center of gravity of the vibration system and the center of the driving point. Since the
centers of the support points are arranged at the same point, the magnetic circuit can be
subjected to push-bull operation even at large amplitudes, and it is possible to reproduce the
vibration which canceled each other's distortion.
Brief description of the drawings
1 and 2 are side sectional views of a transducer according to the present invention, and FIG. 3 is
a side sectional view of a conventional transducer.
10・・・ケーシング、11.21・・・センターボール、12 22・・・ボトムプレート、
13.23・・・ングネツ[・、14 24・・・トップフレート−115,25・・・ボビン
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