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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of the speaker of the
present invention, FIG. 2 is a characteristic diagram of voice coil temperature to input, FIG. 3 is a
frequency characteristic diagram, 2 is a magnetic fluid, 6 is a voice The coil bobbin, 7 shows a
reinforcing ring, respectively.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker with an
expanded bass reproduction range. The bass reproduction range of the speaker is mainly
determined by the lowest resonance frequency (fol) of the speaker. Assuming that (fol is the stay
of the support system such as an edge or a damper (8), the mass of the vibration system is equal
to),... Furthermore, when a speaker of jin is attached to a closed type cabinet, it becomes 2z z 2
21 'J 02 02π. Here, (Sc) is the stiffness of the cabinet, and in order to regenerate the low range
from the equation -1 which is inversely proportional to the volume of the cabinet, the mass
[larger Oka, smaller the stay 7ness (8) or (Sc) If the size of the cabinet is determined, it is
necessary to increase the mass of the vibration system. However, since the efficiency of the
speaker is inversely proportional to the mass, the efficiency is lowered, and a large input is
required to reproduce a large output sound. On the other hand, most of the energy of the
electrical input applied to the speaker is converted to heat generated from the voice coil. When
the input of the speaker becomes large, the temperature of the voice coil portion becomes
remarkably high, and the voice coil is burnt out or the adhesive is softened, and the risk of the
voice coil being thermally destroyed is increased. Therefore, the input resistance of the speaker is
mainly determined by the input resistance of the voice coil. From the point of view, the reduction
in the efficiency of the speaker results in the reduction of the maximum output of the sound to
be reproduced. The present invention provides a speaker in which the bass reproduction range is
expanded by reducing the lowest resonance frequency rfo) without reducing the maximum
output of the speaker. The present invention will be described in detail below. Even if the
efficiency is lowered by increasing the mass [m] to lower the lowest resonance frequency [fol],
the maximum output does not decrease if the speaker's input resistance is improved. If the mass-]
is multiplied by A, the lowest resonance frequency [fo] becomes 1 // r, while the efficiency
becomes I / A. If the input resistance is B times, the maximum output J 'sound is obtained, so if
the input resistance is A2 times, the maximum output is the same. As described above, the
present invention is intended to provide a speaker having an improved bass reproduction range
by covering the decrease in efficiency due to the increase in mass by improving the input of the
speaker. According to the present invention, improvement of human resistance is achieved by
filling the magnetic gap (1) of the speaker with the magnetic fluid (2). The magnetic fluid (2)
used here is one in which fine powder of magnetic metal is uniformly dispersed in oil using a
surfactant, and is, for example, 7 elo l 14 made by U.S. There is (trade name).
For this reason, the magnetic fluid + 2 + l center pole (3) and the magnetic force of the plate (4)
do not collect outside in the magnetic gap fll, and it does not fly out due to the vibrating winter of
the voice coil (5). The heat transfer from the voice coil (5) is smoother to the magnetic circuit
such as the center ball (3) or the plate (4) because the magnetic fluid (2) has better heat
conduction than the air gap of the magnetic gap fl +. It is transmitted and dissipated to the
outside. As described above, since the heat of the voice coil (5) is efficiently dissipated, the effect
of suppressing the temperature of the voice coil (5) is large. FIG. 2 shows the characteristic fB1
of the voice coil temperature with respect to the input of the speaker filled with the magnetic
fluid (2) and the fAl of that of the speaker not filled with the magnetic fluid. As it is clear from the
figure that the voice coil (5) temperature shows the temperature one hour after the input is
applied, the input resistance of the speaker is improved about twice by the filling of the magnetic
fluid (2) I understand. Now, in the case of reproducing low tones, the voice coil has a
considerable amplitude at the time of large input. The voice coil (5) and the five turns of the
bobbin (6) are not circular but cross-sectioned in the form of elliptically distorted vibration at
large amplitude, and there is a risk that the magnetic fluid may be scattered at large input Will
occur. From this point of view, in the present invention, as shown in the figure, the reinforcing
ring (7) is attached to the upper part of the voice coil bobbin (6) to prevent the deformation of
the bobbin (6), and the magnetic fluid (2) The ring (7) is designed to prevent scattering even at
the time of width. The ring (7) is also used to increase the mass and causes a decrease in the
lowest resonance frequency (fO). A specific example will be described below. The aperture is
121, the mass of the vibration system (m) is 5p, and the maximum allowable input is IOW, and
the lowest resonance frequency [fO] is 120- as described above for the speaker, the magnetic
fluid (2) The maximum allowable input was 20 W by filling the gap, and the lowest resonance
frequency [fo] was 100 seven by providing 21 aluminum weight addition and reinforcing rings
(7). The frequency characteristic of this speaker is shown in FIG. In FIG. 5, the solid line indicates
the characteristics of the loudspeaker according to the present invention, and the broken line
indicates that of the existing loudspeaker. As the present invention clearly shows from the above
description, the magnetic gap is filled with the magnetic fluid, and the voice coil bobbin is
attached with the reinforcing ring which prevents the deformation of the pov / while increasing
the mass of the vibration system. The input resonance characteristics can be improved and the
minimum resonance frequency can be reduced. As a result, the bass reproduction range can be
expanded without reducing the maximum input.
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description, jps5626497
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