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JPS58137399

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DESCRIPTION JPS58137399
[0001]
The present invention relates to a disk-like speaker diaphragm made of a sandwich structure in
which a surface material is attached to both sides of a honeycomb core, and a target place
thereof is a honeycomb core as a core material by 10,000 times expansion! It is an object of the
present invention to provide a spill force diaphragm capable of performing nodal vibration with a
circular voice coil by making the nodal circle of the primary resonance mode of the diaphragm
itself into a circular shape. It is ideal that the speaker diaphragm vibrates completely in the use
frequency band. When v-split vibrations in which the diaphragm has a rhombus during the
vibration occur, the sound pressure cylinder V characteristics and distortion two-phase
characteristics are degraded, and high fidelity reproduction can not be expected. In order to fully
realize this ideal, in recent years, a high-rigidity flat diaphragm using a honeycomb sand weft
structure has been adopted. In this flat diaphragm, a bobbin having a voice coil is adhered to an
inner portion in its own primary resonant frequency, and driving is used to largely cancel f first
(high frequency limit frequency) because primary resonance is canceled. It can be increased. A
sand-inch structure using a honeycomb core by 10,000 times expansion used for aircraft etc. is a
material that is light in weight and high in rigidity and is suitable for a plane diaphragm, but the
honeycomb core that can be expanded in one direction is There is a problem that the bending
direction of the core and bending in the direction perpendicular thereto differ from each other,
and the nodal circle of the g1st resonance frequency becomes elliptical. FIG. 1 shows an example
of a plane diaphragm using an aluminum honeycomb core by stretching in one direction, and a
part of a surface material to show the shape of a core material. In FIG. 1, 1 is an aluminum
honeycomb core stretched in one direction in the direction of arrow, 2 is a surface material of
aluminum foil, and 3 indicates a joint circle at a first resonance frequency. And since the
diaphragm made into a honeycomb core metal core rod by one way rolling in this way becomes
an ellipse whose section between the nodal circle and the stretching method in the first
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resonance mode is a short axis, it is made of a circular voice coil The section drive was unreliable.
In order to solve this problem, half diaphragms using axisymmetric honeycomb cores by
rotational expansion have been adopted. FIG. 2 shows the appearance of a plane diaphragm
using an axisymmetric aluminum honeycomb core and a part of the surface material with a cutoff of the shape of the core material. In FIG. 2, 'and 11 are rotationally expanded aluminum
honeycomb cores, 12 is a surface material of aluminum foil, and 13 shows a nodal circle at the
first resonance frequency. As described above, in the case of a diaphragm having an axially
symmetric honeycomb core as a core material, the stiffness distribution and the mass distribution
are axisymmetric, so a circular nodal circle can be obtained.
However, a sandwich structure having an axially symmetric honeycomb core as a core material
by rotational expansion has a problem that the manufacturing process of the honeycomb core
itself is large and the cost is high. The present invention solves such a conventional internal
point, and at least one of the honeycomb core by unidirectional stretching and the surface
material to be attached to both surfaces of the honeycomb core has a long diameter gold
between the honeycomb core stretching methods. A light mass region is provided. According to
such a configuration, it is possible to complementarily compensate for the difference in the
bending stiffness between the honeycomb core / core stretching direction and the direction
perpendicular thereto due to the one-way stretching with the difference in mass distribution.
That is, since the mass in the core expansion direction of the honeycomb core by the onedirection expansion can be made lighter than the mass in the direction perpendicular to this, the
nodal circle of the primary resonance frequency of the honeycomb core by the one-direction
expansion In this case, it is possible to perform node driving with a circular voice coil, and it is
possible to f: I an advantage that a low-cost + trt performance + surface speaker can be used.
Hereinafter, the speaker diaphragm of the present invention will be described with reference to
the drawings. FIG. 3 shows an embodiment of the speaker diaphragm according to the present
invention. In FIG. 3, 31 is a honeycomb core by one-side rolling, which is formed of an aluminum
foil of 20 ?m thickness and ?f, An elliptical hole 32 having a major diameter of 31 mm and a
major diameter of 45 mm having a major diameter in the core stretching direction B of the Hani
Cano Kono 31 is provided as an annular core material. Then, a light filler 33 made of a 40-fold
expanded styrene resin is embedded in the oval holes 32. A facing 34 made of aluminum foil of
50 ?m thickness is pasted on both sides of the core of the double structure thus constructed,
and a flat diaphragm with a diameter of 19 crIl and a thickness of 6 mm is t + * ? 0 In the
diaphragm having such a configuration, the core extending direction H (c major axis of the
honeycomb core 31 is provided at the center H% of the honeycomb core 31), and the d amount
in the core extending direction is perpendicular to the core extending direction. It is possible to
increase the diameter of the nodal circle in the core stretching direction because it is lighter than
the mass in any direction, thus correcting the elliptical nodal circle of the I и nick core 31 by onedirectional stretching to a perfect circular nodal circle 36 can do. In the above embodiment 11>
IJ, a light mass region having a major axis in the core stretching direction of the honeycomb core
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is provided at the center of the honeycomb core by the same stretching. However, the
honeycomb core by this light mass J or one direction stretching. Even if it is provided in the
center part of the surface material to be attached to both sides of the surface, it is possible to
perform the correction of the nodal circle in the same manner.
As described above, according to the present invention, since the surface material is attached to
both surfaces of the honeycomb core by unidirectional stretching and the light mass region
having the long diameter in the core stretching direction of the honeycomb core is provided in
the central portion. By providing an oval node circle of the honeycomb core by expansion as a
circular node circle, it is possible to perform a node jlfl J'i by means of a circular point coil, and to
provide a low cost and high-performance speaker 'F- + speaker. It is possible.
[0002]
Brief description of the drawings
[0003]
1 and 2 are partially cutaway plan views of a conventional speaker diaphragm, and FIG. 3 is a
partially cutaway plan view showing a non-inventive speaker (an embodiment of a fii plate is
shown.
31 ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Surface material
0 generation Name of Toishi person Attorney Nakao;
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