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JP2003032785

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DESCRIPTION JP2003032785
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
multi-mode device having a speaker function mainly applied to general home appliances such as
portable devices, video games, personal computers and the like.
[0002]
2. Description of the Related Art In a conventional micro speaker or multi-mode device, sound is
emitted by a diaphragm, a voice coil, and a magnetic circuit. However, the combination of the
voice coil and the magnetic circuit forms an inductance. Therefore, it has a characteristic of high
rise by multiplying the high range from the mid range. FIG. 4 is a diagram showing sound
pressure versus frequency characteristics of a conventional micro speaker or multi-mode device.
[0003]
SUMMARY OF THE INVENTION In the configuration described above, when listening to human
voice, music, etc., only the high region is emphasized, and it is not distorted that it becomes a socalled "kinkinkankan" sound. There is no problem in the reproduction band as a so-called
telephone having a narrow reproduction band, but the reproduction characteristic is insufficient
as a reproduction frequency band in consideration of melody distribution and music distribution
by recent cellular phones.
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[0004]
Also, when trying to listen to music with a device of such characteristics, it is sufficient to correct
the acoustic characteristics with a processor such as a DSP, and as a result to make it a flat
characteristic, the more frequently the DSP is used And another problem of increased power
consumption occurred.
[0005]
Therefore, an object of the present invention is to provide a multimode device in which the
reproduction frequency characteristic of the multimode device is made flat from the middle to
the high region and the distortion in the high region is reduced in order to clear and clearly
reproduce music. To provide.
[0006]
SUMMARY OF THE INVENTION In order to improve the acoustic characteristics and reduce the
power consumption of the DSP, it is necessary to make the characteristics of the acoustic device
itself as flat as possible.
As a method for solving the above-mentioned problems, a diaphragm having a tangential edge,
and a multi-mode device provided with the same are provided.
[0007]
The tangential edge acts to expand the piston motion over the middle to high range.
Therefore, the diaphragm can move as Lorentz force received from the magnetic circuit and the
voice coil. In addition, accurate piston motion makes it possible to reduce unnecessary resonance
in the high region, and as a result, it is possible to reduce distortion in the high region.
[0008]
That is, according to the present invention, a magnetic circuit, a coil disposed in a space portion
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2
of the magnetic circuit, a diaphragm to which a driving force is given by the coil, a vibration
transmitting portion, and a vibration transmitting portion are fixed. A multi-mode device
comprising an arc-shaped suspension, wherein the suspension flexibly supports the magnetic
circuit, and the diaphragm is a multi-mode device having a tangential edge.
[0009]
Further, according to the present invention, there is provided a multimode device in which the
diaphragm is a tangential edge provided with a spiral cut in the vicinity of the outer periphery.
[0010]
FIG. 1 is an illustration of a multi-mode device according to an embodiment of the present
invention.
In the multi-mode device of the present invention shown in FIG. 1, the driving force is provided
by a magnetic circuit composed of permanent magnet 1, yoke 2 and plate 3, coil 5 arranged in
the space of the magnetic circuit, and coil 5 A multi-mode device comprising a given diaphragm
4, a vibration transmitting portion 7, and an arc-shaped suspension 6 fixed to the vibration
transmitting portion 7, wherein the suspension 6 makes the magnetic circuit flexible. Supporting
and the diaphragm 4 is a multimode device with tangential edges.
[0011]
FIG. 2 is a plan view of the diaphragm of the multimode device of the present invention.
As shown in FIG. 2, the diaphragm 4 is formed with a tangential edge provided with a cut 41 in a
spiral shape in the vicinity of the outer periphery.
[0012]
The notches 41 are provided in symmetrical positions in the diaphragm in two sets. The notch 41
flattens the frequency characteristics of the vibration of the diaphragm 4.
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[0013]
FIG. 3 is a diagram showing sound pressure versus frequency characteristics of the multimode
device of the present invention. As shown in FIG. 3, the peak of the high range in the sound
pressure vs. frequency characteristic, which is found in the conventional characteristics, is
suppressed, and the high range becomes a smooth characteristic.
[0014]
As described above, since the multi-mode device according to the present invention can be used
in the same manner as a normal speaker, it can be mounted on a device without changing the
configuration of the device.
[0015]
As described above, by using the microspeaker and multi-mode device according to the present
invention, clear and clear sound quality can be obtained even in small portable devices without
sound correction by DSP or the like. It is
[0016]
Brief description of the drawings
[0017]
1 is an explanatory view of a multi-mode device according to an embodiment of the present
invention.
[0018]
2 is a plan view of the diaphragm of the multi-mode device of the present invention.
[0019]
3 is a diagram showing the sound pressure versus frequency characteristics of the multi-mode
device of the present invention.
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[0020]
4 is a diagram showing the sound pressure versus frequency characteristics of the conventional
micro speaker and multi-mode device.
[0021]
Explanation of sign
[0022]
DESCRIPTION OF SYMBOLS 1 permanent magnet 2 yoke 3 plate 4 diaphragm 5 coil 6
suspension 7 vibration transmission part 10 holding part 41 incision
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