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An object is to provide a speaker system capable of preventing generation of distortion in a
frame by appropriately combining a plurality of speaker units, and obtaining reproduced sound
with high fidelity. SOLUTION: Speaker units 1, 1 having the same performance are arranged
symmetrically and fixed by fixtures 2. The driving portion of the speaker unit 1 is inserted into
the mounting portion of the fixture 2 and the periphery is fixed by a screw. In mounting on the
enclosure, the fixture 2 is provided with radial mounting brackets and attached to the enclosure
or the fixture 2 is provided with legs. [Selected figure] Figure 1
Speaker system that suppresses frame vibration
The present invention relates to a speaker system, and more particularly to a speaker system
including a plurality of speaker units capable of obtaining high-fidelity reproduced sound by
eliminating deformation of a frame based on driving of the speaker and shaking of the entire
A typical dynamic speaker unit comprises a frame for mounting in an enclosure, a diaphragm for
converting an acoustoelectric signal into air vibration, a voice coil for converting acoustoelectric
signal into vibration, a magnet, and a yoke for holding a magnet. Ru.
When an acoustoelectric signal flows to the voice coil, magnetism is generated, and a force acts
on the voice coil by the magnet to vibrate the diaphragm. There is also known a nondirectional
speaker system in which a plurality of speakers are arranged symmetrically as shown in FIG. (See
Patent Document 2)
JP, 2006-186778, A JP, 07-0875,85 A
The speaker unit is attached to the enclosure via the frame, and a force acts on the frame by the
reaction of the vibration of the diaphragm during driving, causing the enclosure itself to vibrate
and radiating extra noise. At the same time, since the enclosure does not provide a firm support
so that the speaker diaphragm vibrates faithfully to the input signal, the effect of the vibration of
the enclosure is included in the emitted sound as noise, and the reproduction is faithful to the
input signal. I can not get a sound.
In order to solve this problem with the speaker unit alone, as described in Patent Document 1
(Japanese Patent Laid-Open No. 2006-186778), a position where the bridge of the frame crosses
the center line inside the outer peripheral portion with an appropriate interval It is proposed that
the sound quality be prevented by disposing the frame in order to improve the strength of the
frame and attenuating or eliminating the vibration generated in the magnetic circuit by the
vibration of the diaphragm at the mounting portion of the bridge.
SUMMARY OF THE INVENTION The present invention provides a speaker system capable of
preventing distortion in a frame even in an existing speaker unit without strengthening the frame
and obtaining high-fidelity reproduced sound.
A speaker system in which speaker units having the same performance are arranged
symmetrically, all the frames holding the drive units of the speaker units are connected to one
another, and forces acting on the frames by the speaker drive cancel each other.
EXAMPLES The basic concept of the present invention will be described.
As shown in FIG. 1, the speaker units 1, 1 having the same performance are symmetrically
arranged and fixed by a cylindrical fixture 2 for fixing the speaker unit 1.
The material of the fixture 2 is not particularly limited, and any material such as metal or
synthetic resin can be used. The fixture 2 may be any rigid fixture to which the drive unit of the
speaker unit 1 is fixed and which is less likely to cause resonance in the audible range. In the
example of FIG. 1, a fixture in which the base of the speaker unit 1 is cylindrical It is inserted in 2
and fixed with a screw at the periphery.
FIG. 2 shows a modification of the fixture 2. For attachment to the enclosure, the fixture 2 is
provided with radial mounting brackets and attached to the enclosure, or the fixture 2 is
provided with legs and fixed. In such a state, when an acoustoelectric signal is sent to the speaker
units connected in series or in parallel, the diaphragms of the two units are driven in opposite
directions when viewed as a whole of the speaker unit, and the force acting on the frame is Since
they cancel each other, the frame does not vibrate and the reproduced sound maintains high
FIG. 3 shows a speaker unit symmetrically fixed by a fixture 2 to an enclosure 3 having six sides
like an omnidirectional speaker system, in which sound waves are emitted in all directions of 360
degrees. The fixture 2 fixes not only the facing speaker units but also all the speaker units
integrally, and is fixed to the enclosure by an appropriate means.
The characteristics of the speaker units arranged symmetrically are premised to be the same, but
since the secular change of the permanent magnet is quite large and the individual difference is
large, it is expected that the effect of suppressing the frame vibration becomes gradually weaker
Be done. Therefore, as shown in FIG. 4, it is preferable to share the magnetic circuit, that is, to
share the permanent magnet 5 with the two diaphragms 4 to drive the voice coil 6.
FIG. 5 shows the mounting condition of the present invention in the case of a low frequency band
having little directivity. The speaker unit 1 is connected to each other by the fixture 2 and the
front and rear of the enclosure is shown. Is mounted to emit sound waves. FIG. 6 shows the case
of full range, and since directivity is different from the case for bass, the reflection toward the
rear wall is unnaturally reflected by the speaker directed to the rear, so that FIG. As shown in FIG.
1, it is preferable that the rear side speaker is not fixed to the cabinet, but is housed inside the
cabinet as being supported by the front side speaker. Although the impedance of the acoustic
radiation between the front-facing speaker and the speaker stored inside is slightly different,
there is no problem in suppressing frame vibration in the low range.
The following test was conducted to confirm the effect of the present invention. Two frames of
the same performance (FE-127E made of Fostex) are fixed to each other with their frames back
to back, and these are suspended with about 50 cm of tegs, and a 1-2 W sine wave (100 Hz and
300 Hz) is input. The results of measuring the vibration of the frame around the edge for 6
seconds are shown in FIGS. 7 and 8. The “in-phase” in the figure means that the diaphragms of
the two speakers simultaneously vibrate outward or inward when viewed from the integrated
frame, so that the entire frame It shows a situation where no reaction due to vibration occurs.
In fact, due to factors such as individual differences among speakers, that the diaphragm is not
completely synchronized with the input vibration, and divided vibrations in the high range, the
vibration of the frame is not completely zero. The "opposite phase" is the case where a signal is
input so that one diaphragm is recessed from the frame when the other diaphragm is inflated
from the frame, and only one speaker is suspended to make an input of the same size. It is almost
the same as the state which gave and measured. From the above results, it was confirmed that
the present invention suppresses frame vibration.
BRIEF DESCRIPTION OF THE DRAWINGS The conceptual diagram of the speaker system of this
invention. The conceptual diagram of the other Example of a fixing tool. The conceptual diagram
which made this invention the omnidirectional speaker system. The conceptual sectional view of
the example which made the magnetic circuit common. Conceptual diagram of the mounted state
of the cabinet (bass). Conceptual diagram of the mounted state to the cabinet (full range).
Measurement graph of frame vibration (100 Hz). Measurement graph of frame vibration (300
Hz). The conceptual diagram of a nondirectional speaker system.
Explanation of sign
1 speaker unit 2 fixture 3 enclosure
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