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JP2005110192

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DESCRIPTION JP2005110192
PROBLEM TO BE SOLVED: It is necessary to lower the lowest resonance frequency as a factor to
increase the bass reproduction limit of a small speaker system, but the overall sound quality is
improved without deteriorating the electroacoustic conversion efficiency, transient
characteristics, high region characteristics etc. Is difficult. SOLUTION: A full range speaker and an
airtightness are achieved without deteriorating the overall characteristics of the speaker by
performing speaker control by the electric characteristics such as minimum resonance frequency,
electromotive force, and resistance change of a dynamic material connected in parallel or in
series to the speaker. A compact and simple speaker system is constructed by a mold cabinet, a
filter circuit including a current collector, etc., and the bass reproduction limit is raised. [Selected
figure] Figure 1
Speaker control current collector
[0001]
The present invention is a current collector for the purpose of speaker control, and in particular
for the reduction of distortion in the bass range, by incorporating the current collector as a
passive element forming a filter circuit in a speaker system. The present invention relates to
vibration control technology of a speaker by electrical characteristics generated between
terminals.
[0002]
In the characteristics of the speaker system, in order to increase nonlinear distortion below the
lowest resonance frequency, it is necessary to set the lowest resonance frequency as low as
possible. In that method, particularly in the miniaturization of the speaker system, the acoustic
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conversion efficiency and high frequency characteristics are deteriorated Even then, it was
necessary to make the speaker diaphragm heavier.
[0003]
As such, there is a need for a composite speaker system that is dedicated to bass and high-tone
speakers, and the filter circuit by the passive element of the speaker system mainly targets the
composite speaker system and filters by coils, capacitors, resistors, etc. It forms a circuit and
controls the output sound pressure frequency characteristic.
[0004]
In bass reproduction by a small speaker system, the bass radiation area is lowered due to the
small diaphragm area of the speaker, and a large amount of amplitude is required, and an
increase in nonlinear distortion can not be avoided.
[0005]
Non-linear distortion is often generated below the lowest resonance frequency of the speaker
system, and is due to the elasticity of the dampers and edges which are the holding parts of the
movable coil and the diaphragm, and the influence of air elasticity in the closed cabinet.
[0006]
While it is necessary to soften such elasticity and lower the minimum resonance frequency as a
factor to increase the bass reproduction limit, the miniaturization of the speaker system can not
avoid the increase of the minimum resonance frequency.
[0007]
Although it is possible to lower the lowest resonance frequency by making the diaphragm of the
speaker heavier, the electro-acoustic conversion efficiency, transient characteristics, high
frequency characteristics and the like are deteriorated, and it is difficult to improve the overall
sound quality.
[0008]
In addition, the overall sound quality improvement is not easy due to the low-pass acoustic
characteristics including the specific diffraction effect belonging to the open back type cabinet,
and the restriction of the structure and the shape.
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[0009]
The present invention corresponds to a small-sized enclosed cabinet which has no problem of
acoustic characteristics due to the diffraction effect other than the difficulty in reproducing the
bass sound.
[0010]
The main task is to easily enhance the bass reproduction capability of a compact sealed speaker
system that is greatly affected by air elasticity without setting the lowest resonance frequency of
the speaker excessively low.
[0011]
In the present invention, the speaker control is performed by the electrical characteristics such as
the minimum resonance frequency, electromotive force, and resistance change of the movable
coil in the moving body connected to the speaker input terminal.
[0012]
The structure of the current collector uses the type of electrodynamic speaker, but the
diaphragm for the purpose of generating sound is not necessary, and the movable coil 1, the lead
2, the bobbin 3 and the mass adjustment material 5 aim at electrical characteristics. And so forth,
and a pole piece 8 forming a magnetic circuit, a yoke 6, a plate 9, a magnet 7, and a frame 10
and a terminal 11 for holding the whole.
[0013]
The equivalent mass adjustment material 5 is joined to the bobbin around which the moving coil
of the current collector is wound, and the minimum resonance frequency and the impedance
characteristic are changed.
[0014]
The target impedance characteristics can also be approached by increasing or decreasing the
elasticity or movement resistance of the moving coil holding part of the moving body.
[0015]
Connect a current collector parallel to the speaker, whose lowest resonance frequency is lower
than that of the speaker.
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[0016]
Alternatively, the lowest resonance frequency is appropriately set in accordance with the low
frequency characteristics of the speaker, and a current collector that also uses the electrical
characteristics below the lowest resonance frequency is connected in series with the speaker.
[0017]
In particular, it is difficult to achieve both low frequency characteristics and electro-acoustic
conversion efficiency, transient characteristics, high frequency characteristics, etc. in improving
the sound quality of a small and simple speaker system, but a full range speaker with good
overall characteristics other than low frequency characteristics By connecting the current
collector, it is possible to increase the bass reproduction limit without compromising the features
of the speaker.
[0018]
The parallel type of current collector makes it possible to generate an electromotive force with
less non-linear distortion, and only by connecting in parallel to the speaker, both lowest
resonance frequencies and electromotive force are synthesized without disturbing the
characteristics of the speaker, and as a speaker system The low resonance frequency of the low
frequency component can be reduced, and non-linear distortion can be reduced from low to high
frequencies.
[0019]
The series-type current collector has the effect of canceling out the non-linear distortion caused
by the elastic load of the speaker due to the change in current at the elastic load in the low range.
[0020]
In addition, since a smooth high-frequency attenuation characteristic can be obtained, the
frequency characteristic can be improved with a simple filter circuit.
[0021]
Since the current collector can be treated as a kind of passive component that enables speaker
control using electrical characteristics, there is no limitation that limits the speaker system and
the speaker system system, and the application range is wide.
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[0022]
As shown in FIG. 2, a speaker system is formed by the small-sized enclosed cabinet 12, the full
range speaker 13, the filter circuit board 14, the current collector 15, and the like.
[0023]
The current collector and the filter element may be provided outside the cabinet by forming a
filter circuit on the same substrate.
[0024]
The magnetic circuit of the current collector is preferably in a strong form so as to easily obtain
an electromotive force, and the rated impedance is preferably as low as possible.
[0025]
It is preferable that the rated input of the current collector can withstand the rated input of the
speaker.
[0026]
Example 1 of the parallel-type current collector in FIG. 2 will be described with reference to FIG.
1, FIG. 3 and FIG.
[0027]
In FIG. 1, the mass increasing material 5 of the bobbin 3 is made high compliant by securing the
air permeability so as to make the holding part 4 soft and keep air resistance low so that the
movable coil 1 moves efficiently. Thus, the lowest resonance frequency of the current collector is
lowered, and the current collectors are connected in parallel as shown in the circuit diagram of
FIG.
[0028]
In the characteristics shown in FIG. 4, the peak r2 indicating the lowest resonance frequency of
the impedance characteristic and the frequency characteristic f1 show the characteristics of the
speaker system in which the current collector and the filter circuit are connected as shown in the
circuit diagram of FIG. The impedance characteristic r3 and the frequency characteristic f2
indicate the characteristics of the speaker system in which the current collector and the filter
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circuit are not connected.
[0029]
The peak r1 of the lowest resonance frequency is the impedance characteristic of only the
parallel type current collector, and the lowest resonance combined with the peak r3 of the lowest
resonance frequency not connected by parallel connection with the speaker as shown in the
circuit diagram of FIG. A peak r2 of the frequency is obtained, and a filter circuit determines a
frequency characteristic f1 which can suppress the rise of the high region.
[0030]
Example 2 of the series-type current collector in FIG. 2 will be described with reference to FIG. 1,
FIG. 5 and FIG.
[0031]
By making the holding part 4 in FIG. 1 stiff to a certain extent, the electrical characteristics of the
movable coil 1 having a large elastic load can be determined by lowering the compliance to a
certain extent, and a viscous material is used together with the holding part 4 to suppress the
increase in resistance value of the lowest resonance frequency. .
[0032]
In the characteristics shown in FIG. 6, impedance characteristics r5 and frequency characteristics
f3 show the characteristics of the speaker system connecting the current collector and the filter
circuit as shown in the circuit diagram of FIG. f4 indicates the characteristics of the speaker
system in which the current collector and the filter circuit are not connected.
[0033]
The peak r4 of the lowest resonance frequency is an impedance characteristic of only the seriestype current collector, and the peak r4 is suppressed by the viscous resistance of the holding part
4, but the current decreases in that portion.
[0034]
Therefore, a dip is generated in the frequency characteristic of the speaker in which the current
collectors are connected in series, and the peak r4 of the impedance characteristic is set in the
low band peak portion p of the frequency characteristic of the speaker to help flatten the
frequency characteristic.
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[0035]
FIG. 6 is a cross-sectional view of a speaker system according to an embodiment of the present
invention. FIG. 6 is a circuit diagram of a speaker system according to an embodiment of the
present invention. FIG.
Explanation of sign
[0036]
Reference Signs List 1 movable coil 4 holding part 5 mass adjustment material 12 closed cabinet
13 speaker 14 filter circuit board
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