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DESCRIPTION JPH02195798

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DESCRIPTION JPH02195798
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to the
structure of a loudspeaker, and more particularly to a loudspeaker in which the bass output is
enhanced. [Summary of the Invention] The speaker according to the present invention uses, for
example, a speaker box having a closed structure as a baffle plate, and a passive radiator is
disposed on the back of the diaphragm of the speaker at a predetermined distance, Is emitted to
the front side of the speaker from the opening of the vent ring disposed at the outer periphery of
the diaphragm of the speaker, so that the reproduction output of the bass is enhanced, and the
speaker system is miniaturized. be able to. BACKGROUND OF THE INVENTION The lowest
frequency of an acoustic wave reproduced by a speaker is generally limited by the lowest
resonant frequency fO of the diaphragm. Therefore, a speaker unit for bass is generally upsized,
heavy and expensive, and becomes expensive as a speaker system. Therefore, it has been
considered to apply various devices to a speaker box to which a speaker is attached to enhance
the bass reproduction capability. Fig. 2 shows an acoustic duct (AD) AD provided on the front
side of the box BX to which Sukika Unitz SP is attached, and the acoustic duct ADK guides the
vibration wave of the bass region emitted from the rear side of the speaker unit SP to the front of
the box BX And the bass enhancement. Also, in FIG. 3, the passive radiator PR is disposed on the
front side of the box BX to which the speaker unit SP is attached, and the resonance frequency of
the passive radiator PR (also called drone cone) is set to the bass reproduction frequency By
doing this, it is intended to improve the ability to reproduce the bass. Since it is necessary to
provide the parasitic radiator PR, there is a problem that the speaker system becomes large. In
addition, when the bass unit reproduction capability of the speaker unit itself is poor, in order to
enhance the bass output, the speaker system needs to be enlarged, and there is a problem that
cost increase can not be avoided. [Means for Solving the Problems] The present invention has
been made in view of the problems as described above, and, for example, only a predetermined
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distance on the back surface of a diaphragm of a speaker provided in a sealed speaker box The
passive radiators are spaced apart and configured to emit the vibration of the passive radiator to
the outside of the speaker box. [Problems to be Solved by the Invention] However, the speaker
system as described above is used as an acoustic element for enhancing the bass in the speaker
box BX, such as an acoustic duct or a back of the diaphragm of a loudspeaker. Since the passive
radiators are disposed so as to be able to pivot, it is not necessary to attach an acoustic element
for enhancing the bass on the wall of the speaker box, and the speaker system can be
miniaturized.
The vibration of the passive radiator is released to the outside through the opening of the vent
ring supporting the diaphragm or the side wall of the speaker box, so that the resonant
frequency of the passive radiator has an acoustic impedance appropriate to the bass
reproduction frequency. By setting so as to be, it is possible to increase the bass reproduction
capability. FIG. 1 shows a cross-sectional view of the structure of a speaker according to an
embodiment of the present invention. Reference numeral 1 denotes a frame of the speaker, 2
denotes a diaphragm of the speaker (hereinafter referred to as a cone), 3 denotes the above It is
a povin for driving the cone 2, and the position 3 is pivotally fixed to the frame 1 by the damper
4. Then, the voice coil 5 is wound around the outer periphery of the povin 3. The povin 3 on
which the voice coil 5 is wound is suspended in the gap between the plate 8 and the center pole
9 which are magnetized by the doughnut-shaped magnet 7 disposed on the yoke 6 and moves as
well known. It constitutes an electronic speaker. lO denotes a passive radiator added to the
loudspeaker of the present invention, which is attached at one end to the outer periphery of the
frame l via a soft edge IOA, and the other end is also a protrusion of the frame l The IB has been
anchored via the soft edge IOA. Reference numeral 11 denotes a vent ring disposed on the outer
peripheral side of the cone 2, and the vent ring 11 has a plurality of radial openings 11A. IA
indicates an opening opened around the frame 1, 9A indicates a communication hole opening the
center of the center pole 9, and 12 indicates a speaker box supporting the speaker of the present
invention. It shows a part. As described above, since the passive radiator 10 is attached to the
rear side of the cone 2 through the soft edge 10A so as to be rockable as described above, when
the speaker is driven and the cone 2 vibrates, the back of the speaker is The passive radiator 10
also vibrates due to pressure. When the acoustic impedance ("resonance frequency") of the
passive radiator 10 is set to a suitable value (lower than the bass resonance frequency of the
speaker), passive when the cone 2 vibrates with bass is passive. The vibration of the radiator lO
also becomes remarkable, and the acoustic wave is effectively emitted from the opening 11A of
the vent ring 11, so that the bass reproduction capability of the speaker can be enhanced. This is
because the passive radiator 10 exhibits the same function as the function of the passive radiator
PR shown in FIG. 3 described above.
As described above, since the loudspeaker according to the present invention does not need to
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provide a passive radiator on the wall surface of the loudspeaker pock as shown in FIG. 3 as a
conventional example, there is an excellent effect that the loudspeaker system can be
miniaturized. It is preferable to make the high compliance structure as much as possible by
forming a lightweight resin in the shape of a cone, for example, and locking it at a soft edge of
1.degree. Further, the opening 12A may be provided on the side wall of the speaker box 12
instead of the opening 11A of the vent ring. [Effects of the Invention] As described above, in the
speaker according to the present invention, the passive radiator is disposed on the back of the
speaker cone by a predetermined distance, and the acoustic wave by the vibration of the passive
radiator is provided around the outer periphery of the cone. Since the sound is emitted to the
outside from the opening of the vent ring or the opening formed in the side wall of the speaker
box, the reproduction output of the bass region of the speaker is effectively guided to the front
side of the box. There is an effect that the ability to reproduce the bass can be improved even
when a small speaker box is used.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a cross-sectional view of the side of a speaker showing one embodiment of the present
invention, and FIGS. 2 and 3 are explanatory views showing the side of a conventional speaker
system.
In the figure, 1 is a speaker frame, 2 is a diaphragm (cone), 3 is a bobbin, 4 is a damper, 5 is a
voice coil, 6 is a yoke, 7 is a magnet, 10 is a passive radiator, and 11 is a vent ring. Figure 2
Figure 3
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