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JPS5615189

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DESCRIPTION JPS5615189
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing an embodiment
of the present invention, and FIG. 2 is an equivalent circuit diagram thereof. 1 · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · voice coil
bobbin, 5 · · · · voice coil, 6 · · · ......... Damper, 7 ... ... Frame ... 8 ... ... Diaphragm, 9 ... ... Viscoelastic
material.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker
incorporating a mechanical low pass filter to block reproduction of high frequency components.
Conventionally, in the case of reproducing only a signal of a predetermined frequency or less, a
speaker capable of reproducing beyond the desired high frequency upper limit frequency, and an
electrical low-pass filter composed of a coil, a capacitor, etc. It was used together and it was made
to reproduce only the signal below a desired frequency. However, in this case, a large-sized coil
or coil is required for the low-pass filter, which is disadvantageous in terms of both cost and
structure. The present invention provides a speaker which solves such conventional problems. An
embodiment of the present invention will be described below with reference to FIGS. 1 and 2. In
FIG. 1, 1 is a center ball, 2 is a ring-shaped magnet, 3 is a ring-shaped plate, 4 is a voice coil
bobbin, 6 is a Heuss coil, 6 is a damper, 7 is a frame, 8 is a diaphragm, A conventionally known
speaker is configured. The numeral 9 is a visco-elastic material having viscosity 9 elasticity or
both as rubber, sponge or the like, and the voice coil bobbin 4 and the diaphragm 8 are coupled
via the visco-elastic material 9. In the above configuration, when an input signal is applied to the
voice fill, the voice coil bobbin 4 vibrates according to the input signal. When the frequency of
the input signal is low, the vibration of the voice coil bobbin 4 is transmitted to the diaphragm 8
via the material 9 to the visco-elasticity, and the diaphragm 8 is positive and negative. . Follow,
move. It vibrates like 74 and 3 in the same way. When the frequency of the input signal is high
and the frequency is higher than a predetermined frequency, the vibration of the bobbin 4 is
absorbed while being transmitted in the viscoelastic material 9 and the diaphragm 8 can not be
12-05-2019
1
driven. In this way, high frequency reproduction of the speaker is prevented, and an operation
equivalent to that of substantially inserting a low pass filter is obtained. The equivalent circuit of
FIG. 1 is shown in FIG. In FIG. 2, mv is the mass [咄] of the voice coil 4, ms is the mass (kg) of the
diaphragm 8, and SC is the stiffness CN / m of the viscoelastic material 9. From these constants,
the high frequency reproduction limit frequency fc of the speaker in FIG. 1 is fc−! It is
represented by -4ζ7-fan2πmymB. Therefore, by arbitrarily selecting my, mB, and So, it is
possible to make the speaker itself have a low-pass characteristic, and to set the high frequency
reproduction limit frequency arbitrarily.
As in the present invention, as in the present invention, the visco-elastic material is provided
inside the speaker so that the speaker itself has low-pass characteristics, the circuit configuration
can be simplified and the cost can be reduced.
12-05-2019
2
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