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JPS5838097

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DESCRIPTION JPS5838097
[0001]
The present invention relates to a loudspeaker system, and more particularly, to a loudspeaker
system that uses a cone-type loudspeaker while reducing the cone dent effect. Cone-shaped
loudspeakers are suitable in principle for infinite bubble, for bubble surface, generally for finite
plane bubble, and generally for finite plane bubble, sometimes cylindrical or spherical or other
bubbles, but Instead, since the surface of the cone is recessed, it has sound pressure frequency
characteristics and sound pressure phase frequency characteristics due to the so-called
"dentation effect", which causes a problem that it interferes with high fidelity reproduction.
Recently, flat loudspeakers have been used to eliminate the hollow effect in the loudspeaker, but
flat loudspeakers are generally heavier in sound compared to cone loudspeakers and thus have
lower or lower electroacoustic conversion efficiency. The greater the magnetic energy needed to
do this, the higher the cost, and the higher the cost of the diaphragm. Flat speakers have the
disadvantages mentioned above. An object of the present invention is to eliminate the abovementioned disadvantages of the prior art, and to provide a speaker system using a cone type
speaker with a small depression effect. According to the present invention, in order to achieve
the above-mentioned object, a portion of a cone-shaped diaphragm is projected forward of a
bubble surface, ie, in a direction of a space where a sound wave is to be emitted when viewed
from the diaphragm. By adding another depression and expansion effect simultaneously to the
diaphragm, or by attaching another expansion plate with a expansion effect to a scallop or coneshaped diaphragm, a degree of complementarity of both the depression and expansion effects is
obtained. It is intended to realize a sound pressure frequency characteristic, a tone position, and
a sum frequency characteristic similar to those obtained by using a cone type speaker but using a
flat speaker. Of course, in the loudspeaker system according to the invention, the
complementarity of the indentation and bulge effects is not perfect. However, for a cone-type or
dome-type diaphragm, the frequency range in which they can be regarded as a point source on
11-05-2019
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an infinite baffle (ka: 2: where k = 2π / λ, λ is the wavelength, and a is the effectiveness of the
diaphragm As far as the radius is concerned, the front and back parts of the front of the
diaphragm divided by the plane through the baffle face are not different from the projected areas
with respect to the plane through the baffle face, respectively. The complementarity is good as
long as the volume of the shadowed part is almost the same. The present invention utilizes
complementarity in this region.
Hereinafter, an embodiment of a speaker system according to the present invention will be
specifically described with reference to the drawings. FIG. 1 shows a cross section of a speaker
and its peripheral portion of a first embodiment of a speaker system according to the present
invention. In FIG. 1, 1- is a speaker, 2 is a cone type diaphragm (hereinafter simply referred to as
a cone), and 2 'is a flexible edge suspension. The edge suspension 2'ld may be a common
material with the cone / 2, or may be a material different from the cone 2. In the latter case, a
part of the material is bonded to the cone 2 and fixed. 2 is a margin portion of the end
suspension, 6 is a center cap, 4 is a frame, 4 'is a frame rising portion, 5 is a magnetic circuit, 6 is
a baffle plate, 6' is a front surface of the baffle plate 6 The surface 6) is a virtual plane passing
through the surface 6 'and crossing the speaker 1). Even when the baffle surface 6 'is a curved
surface, the surface to which the speaker is attached may be a flat surface. A series of planes
consisting of the front face of the cone 2, the front face of the edge suspension 2 'and the front
face of the center cap 3 are divided by the virtual plane 6 ". And, the front part includes the edge
suspension 2 ', and the rear part includes the center cap 3. Consider a zone in which the cone 2
vibrates in a piston. The outer periphery of the suspension 2 'is fixed to the frame 4 while
moving with the inner periphery Hakone 2 of the Enon suspension 2'. In this case, the effective
radius a of the edge suspension 2 'is generally the innermost edge of the edge suspension 2', that
is, the radius to the point vibrating at the same speed as the cone 2 is al. It is determined by the
following equation (1), where a2 is the outermost radius of ', that is, the radius to the stationary
and non-moving point. Therefore, in the above-mentioned series of surfaces, within the range of
the circumference of the radius a, piston oscillation is performed, and the outside can be
regarded as stationary. The surface of the range considered to be carrying out this piston
vibration shall be called equivalent piston vibration surface. Here, a portion of the equivalent
piston vibration surface before the virtual plane 6 will be considered. The equivalent piston
vibration plane before the virtual plane 6 is projected perpendicularly to the virtual plane 6 ', and
the volume of the portion that becomes a shadow at that time is set to 7. Next, consider the
portion of the equivalent piston oscillation surface after the imaginary plane 6 ′ ′. The
equivalent piston vibration plane after the virtual plane 6 ′ ′ is projected perpendicularly to
the virtual plane 6 ′ ′, and the volume of the shadow portion at that time is set to 8.
If the center camp 5 is not provided, the shadows inside the poppy / 9 in FIG. 1 will disappear, so
the volume of shadows behind the virtual plane 6 "will be reduced accordingly. -! Also, if the
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center cap is made using a mesh or perforated plate, the volume of the shadow decreases
according to their aperture ratio. In any case, it suffices to determine the position of the virtual
plane 6 ′ ′ with respect to the equivalent piston vibration surface so that the volumes 7 and 8
described above are substantially equal, and if the height of the frame raising portion 4 ′ is
determined Good. Here, a virtual cylindrical surface 10 passing through the circumference of the
effective radius a of the edge suspension 2 'and perpendicular to the virtual plane 6' ', the surface
of a portion of the edge suspension outside the virtual cylindrical surface 10, and glue The
volume of the portion quadrupled by the surface of the boss 2 ′, the outer surface of the frame
raising portion 4 and the imaginary plane 6 ′ should be as small as possible. The reason is that
this part corresponds to the protrusion of the part of the bubble surface 6 'to the part of the
cartridge suspension 2' and the glue margin 2 '. This is because it reduces the effect given earlier
to some extent. By the way, if the diameter of the frame rising portion 4 'is made as large as
possible, the baffle surface 6' is also brought forward with the above-mentioned series of
surfaces, and relatively, the above-mentioned series of surfaces are bubbled It does not go out of
6 '. Therefore, if it is necessary to recoup the amount reduced as described above, it is necessary
to further extend the above-mentioned series of faces. In the case where the frame 4 does not
have the rising portion 4 'as described above, another annular body corresponding to 4' may be
formed and combined. Next, by combining a cone-shaped diaphragm and a diaphragm having a
convex surface, for example, a dome-shaped diaphragm, the same purpose can be achieved
without projecting the frame 4 in front of the virtual plane 6 ′ ′. But, I will describe the
example below. FIG. 2 is a view showing a cross section of a loudspeaker and its peripheral
portion of a second embodiment of the loudspeaker system according to the present invention. In
FIG. 2, 1 'is a speaker, 11 is a frame, 12 is a dome-shaped diaphragm (hereinafter simply referred
to as a dome). The dome 12 is fixed to the cone 2. Projecting the surface of the dome 12 behind
the imaginary plane 6 ′ ′ and the surface of the part behind the imaginary plane 6 ′ ′ of the
cone 2 not covered by the dome 12 perpendicular to the imaginary plane 6 ′ ′ Let A be the
volume of the shadowed portion, and 13 be the volume of the shadowed portion when the
surface of the portion before the virtual plane 6 'of the dome 12 is projected perpendicularly to
the virtual plane 6 ". By setting the size and shape of the dome 12 so as to be approximately
equal to A and B, the object can be achieved without projecting the frame 11 in front of the
virtual plane 6 ′ ′.
However, in this method, the mass of the dome 12 tends to be a dog, and furthermore, the
strength of the cone 2 needs to be relatively high to support the dome 12, and thus the mass of
the cone inevitably tends to increase There is. Of course, an example using the above two
methods in combination can be easily considered. As described above, according to the present
invention, since the depression effect of the diaphragm can be reduced without using the planar
diaphragm, the sound pressure frequency characteristic and the sound pressure phase frequency
characteristic comparable to the speaker system using the planar diaphragm In addition, such an
effect can be obtained that the cost can be realized at the same cost as the conventional speaker
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system using a cone-shaped diaphragm or at the same cost.
[0002]
Brief description of the drawings
[0003]
1 and 2 are cross-sectional views showing a speaker and its peripheral portion of the first and
second embodiments of the speaker system according to the present invention, respectively.
REFERENCE SIGNS 1.1 '... speaker 2 ... -I- emission-shaped diaphragm (cone) 2 s ° edge
suspension 2 "... overlap portion 6 ... Center caps 4: Frame 4 '... Frame rising part 5 ... Magnetic
circuit 6 ... Baffle plate 6 ... Baffle surface 6 "... Virtual plane 9 ... Bobbin 1 o ... Virtual cylindrical
surface 11 ...・ Frame 12 ・ ・ ・ Dome shaped diaphragm (dome) agent patent attorney
Junnosuke Nakamura
11-05-2019
4
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