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JPS60160298

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DESCRIPTION JPS60160298
[0001]
FIELD OF THE INVENTION The present invention relates to a passive radiator that is used as a
means to improve the bass characteristic of a speaker system, and the present invention
particularly relates to a passive radiator using a flat diaphragm. Background art and its problems
As a conventional speaker system, a cabinet provided with a low frequency reproduction speaker
is provided with a diaphragm without a voice coil in addition to the low frequency reproduction
speaker, that is, a passive radiator also known as dron cone. It has been proposed to perform a
corresponding operation to improve the bass characteristic of the speaker system by resonance
of the cone. It is conceivable to use a flat plate of honeycomb sandwich structure as shown in
FIG. In FIG. 1, (1) is a cabinet, (2) is a low-range reproduction speaker using a square plate
diaphragm of a honeycomb sandwich structure, and (3) is a square plate diaphragm of a
honeycomb sandwich structure. Passive radiator. In the passive radiator (3) using such a flat
diaphragm, the flat diaphragm (3a) is held by the mounting frame (3b) only by the edge (3C) to
hold the flat diaphragm (3a). I had to make the edge (3C) hard enough. Hardening the edge (3C)
results in an increase in the stiffness, which is disadvantageous to the low-range reproduction
characteristics. For example, as shown by the broken line a in FIG. 2, there has been a
disadvantage that the Qo rises as the low resonance frequency f rises. SUMMARY OF THE
INVENTION In view of the foregoing, it is an object of the present invention to improve the lowrange reproduction characteristics of a passive radiator using this flat diaphragm. SUMMARY OF
THE INVENTION The present invention provides a passive radiator using a flat diaphragm,
wherein the flat diaphragm is provided with a second vibration system in which a predetermined
weight is attached via an elastic body. Can improve the low-pass reproduction characteristics of
this passive radiator. An embodiment of the passive radiator according to the invention will now
be described with reference to FIG. In FIG. 3, parts corresponding to FIG. 1 are given the same
reference numerals, and the detailed description thereof will be omitted. In this example, a
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square plate diaphragm (3a) of a honeycomb sandwich structure is held on the mounting frame
(3b) by a hard edge (3c) similar to the prior art and at the center of the back surface of the plate
diaphragm (3a). A support (4) made of a disk-shaped damper material is fixed by adhesion or the
like, and a weight (5) of a predetermined weight is provided at the center of the support (4).
The weight of this weight (5) is determined by thinking and error so that the sensitivity in the
low frequency range is sufficient at the desired frequency. In this case, the support (4)
constitutes a riser. Also, in this case, the support (4) may not be a damper material but may be
another elastic body. Others are configured in the same manner as in the prior art. The lower
band reproduction characteristic according to this example can lower the lower band resonance
frequency fO as compared with the conventional one and can suppress the peak value of Qo as
shown in FIG. 3 curve and improve the low band reproduction characteristic. did it. This is
because in this example the weight (5) is attached to the flat diaphragm (3a) via the elastic
support (4) of the damper material, the entire system becomes a system with two degrees of
freedom, In addition to the low-pass resonant frequency f due to the flat diaphragm (3a), the
resonant frequency due to the weight (5) attached to the elastic body appears, and the effect of
the resonant frequency of the weight (5) attached to this elastic body It is considered that the
peak value of Qo of the low-pass resonant frequency f of a passive radiator using a conventional
flat diaphragm is suppressed and the low-pass resonant frequency f extends in the low-pass
direction. In the above embodiment, the weight (5) is attached to the support (4) made of an
elastic body, but of course, the elastic body itself may have a predetermined weight. Further, in
the above embodiment, a honeycomb sandwich structure is used as the flat diaphragm, but it
goes without saying that other flat diaphragms such as expanded polystyrene can be used
instead. Of course, the present invention is not limited to the above-described embodiment, and
various other configurations can be taken without departing from the scope of the present
invention. According to the present invention, according to the present invention, in the passive
radiator using a flat diaphragm, even if the edge supporting this flat diaphragm can make the low
resonance frequency fO sufficiently low, the peak of the Qo can be lowered. The value can be
reduced, and the bass reproduction characteristic can be well improved.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view showing an example of a speaker system using a conventional
passive radiator using a flat plate diaphragm, FIG. 2 is a diagram for explaining the present
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invention, and FIG. 3 is one implementation of the passive radiator It is a sectional view showing
an example.
(3a) is a flat diaphragm, (3b) is a mounting frame, (3c) is an edge, (4) is a support made of an
elastic body, and (5) is a weight. Same Matsushima Hidemori S4. “;・3、+、、;:、:□
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