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The present invention relates to a diaphragm having a sun structure and a chi structure in which
a skin material is adhered to the surface of a core material which is lightweight and has high
rigidity when used for a speaker or the like. In general, the speaker diaphragm is lightweight in
terms of material and has a large longitudinal elastic coefficient, and in terms of shape, it is
appropriate to flatten the radiation surface in order to obtain a flat sound pressure frequency
characteristic. Recently, in order to satisfy the above requirements, materials of large longitudinal
elastic modulus (mainly aluminum alloy, carbine graphite) are applied to both front and back
sides of a light and large rigid core material (mainly nick structure, synthetic resin foam) What is
adhered is proposed as a speaker diaphragm. A speaker diaphragm in which the most
representative neo-Nikam structure is a core material (hereinafter referred to as a "nikam core")
will be described. The honeycomb core is manufactured by the following method. As shown in
FIG. 1, adhesive 1b is applied alternately at regular intervals between thin core layers 1a, which
are core materials, and these are stacked and adhered. Next, the bonded core material is cut to a
predetermined width and stretched in the direction in which the layers are stacked to form a
honeycomb core as shown in FIG. By bonding a skin material to the front and back and
processing it into a predetermined shape, a speaker diaphragm is completed. The honeycomb
core diaphragm made in this way is characterized by its lightness and high rigidity, but it has a
defect like a missing edge. (1) It takes many manufacturing steps, and the yield is low, resulting
in high cost. (11) Due to the structural reason of the core material, it shows a directionality that
the bending stiffness is large in the X direction shown in the honeycomb core diaphragm but is
small in the Y direction because of the directionality of this bending stiffness. When used as a
diaphragm, it has subtle effects on the directivity and the position where the diaphragm is driven.
(6) When a diaphragm is made of a honeycomb core and a skin material bonded on both sides of
the core made of a material having a high resonance sharpness Q, a high peak is generated in the
sound pressure-frequency characteristics in the divided vibration region to form a continuous O
shape, and the center of the diaphragm It can be solved by forming trapezoidal peaks more
radially. The problem (g) will be described using the model shown in FIG. FIG. 3 (a) shows a beam
2 having a longitudinal cross section of a gutter shape, and the contrast of this beam is
represented by m (1) of the effective mass of the CO% beam, and FIG. 3 (b) is a beam of uniform
cross section. Denoting "3", the contrast of this beam is Co 'and the effective mass of the beam is
mo'. The resonance frequency of these beams 2 and 3 is J'-o +. Assuming that IO + 'and
resonance sharpness are Qo and Qo', R substitutes the mechanical resistance formula (1) of the
beam into the formula (2).
If the cross-sectional area at the root of the beam and the length of the beam are the same, the
condition of Co> Co 'and mo <mo'--(3) is satisfied by making the shape into a Chion equation (2) '
From Equation (3), it can be seen that the resonance sharpness is lowered by forming Q.sub.o
<Q.sub.0 'and forming it into a Chi-G shape. From this, considering the position of the node of the
primary resonance of the diaphragm as the fixed end 2a of the model shown in FIG. 3, apply
chies toward the inside and the outside of the diaphragm as shown in FIG. Thus, the resonance
sharpness can be lowered to suppress the peak described in the problem (2). In addition, the
above shape has a simple structure compared to the No-Nickam structure, and further, since the
depth of the mountain in the central part becomes shallow due to the Qi / Q attached on the
inner side, the spread of the material is small and the core material is It is very easy to mold and
process, and the core is thin. Since it can be molded by using a black film, it can be manufactured
inexpensively in a short time. As described above, the present invention provides a loudspeaker
diaphragm having a three-toilet structure, which solves the drawbacks of the conventional
diaphragm having a honeycomb structure. Hereinafter, embodiments of the present invention
will be described with reference to the drawings. FIG. 5 is a perspective view showing a first
embodiment of the core member 4 which is a member constituting the speaker diaphragm of the
present invention, wherein the cross section in the circumferential direction has a trapezoidal
continuous shape and the trapezoidal peak 4a is the center The effect of increasing the rigidity in
the radial direction and the shape that becomes thinner gradually toward the non-parallel inner
peripheral part (thickness H2) and the outer peripheral part (thickness H3). . In the valley 4d
between the trapezoidal peak 4a and the adjacent peak 4C, the inclined portion in the radial
direction is straight or flat. FIG. 6 shows a second embodiment of the core member 4 74> N 1],
FIG. 7 is a plan view thereof and the cross-sectional shape in the circumferential direction is the
same as the first embodiment, but from the circumferential portion The trapezoidal ridge 4a is
branched in the vicinity 4b of the node of the first resonance of the diaphragm to be split into
two of the ridges 4e and 4f and extend to the outermost periphery. By increasing the number of
mountains by dividing the mountains 4e and 4f in the vicinity 4b of the node, the rigidity can be
increased. Although it is conceivable to reduce the pitch of the peaks 4e and 4f of the first
embodiment in order to increase the rigidity of the outer peripheral part, the second embodiment
is that the pitch of the inner peripheral part is fine and the core is difficult to form. In the
example, it is possible to increase the rigidity without reducing the pitch of the central mountain.
The height of the mountain 4a14et4f gradually decreases from the vicinity 4b (thickness H +) of
the first resonance node of the diaphragm to the inner peripheral part (thickness Hz) and the
outer peripheral part (thickness H, 3) It is a shape.
The mountains 4c and 4g adjacent to the mountains 4a and 4f are in contact with straight lines
or narrow flat planes 4h and 4i as can be seen in FIG. The cross-sectional shape of the peaks 4a
and e + 4f is not limited to a trapezoid, and it is easy to make it triangular or corrugated, and the
ridges of the mountain can be curved not only linearly in the radial direction. The plane shape of
the first and second embodiments may be a donut shape having a hole at the center as shown in
FIG. 9 in addition to the complete disk shape shown in FIG. FIG. 10 is a cross-sectional view of a
speaker unit completed by incorporating a speaker diaphragm in which an adhesive is applied to
both surfaces of the core member 4 and the skin members 5 and 5 'are attached to a magnetic
circuit. 6 is a diaphragm? イスコイル? Coupling cone to connect the bin 7, 8 is a gays coil, 9 is!
である。 FIG. 11 shows a speaker unit having a polyvinyl chloride core having the shape shown
in FIG. 6 and a diaphragm of 20LyR with a trial made of aluminum alloy foil as a skin material, a
conventional aluminum core as a core material, and an aluminum alloy foil as a skin material It is
a high-pressure-frequency-characteristics figure of the swine-caninite which has a diaphragm of
the same aperture as the above. The numeral 15 is the characteristic of the prototype unit of the
present invention, and the numeral 16 is the characteristic of the speaker unit of the
conventional aluminum honeycomb diaphragm. It can be understood from this figure that by
using the diaphragm according to the present invention, the peak is eliminated and the use band
is broadened as compared with the conventional nicham diaphragm. In addition, the constants of
the materials used in this trial manufacture are analyzed by using the finite element method with
the diaphragm of the core shape shown in Table 1 shown in Table 1 or FIG. The material
constants used for the analysis used the values shown in Table 1, and the model was a quarter of
the actual value. FIG. 12 is a perspective view showing a first vibration mode, and FIG. 13 is a
perspective view showing a second vibration mode. The shape before vibration 17 shown by the
broken line in FIG. 12, 18 is the mode shape of the first vibration, and the node is in agreement
with the thickest portion 18a of the diaphragm. If it is a point, this vibration mode is canceled.
Similarly, in the shape before 17 shown by the broken line in FIG. 13 vibrates, 19 is circular in
the mode shape of the second vibration (0 node 19 a, 19 b). The vibration mode in FIG. 12) 990
Hz and the vibration mode in FIG. 13 occur at 3770 Hz. On the other hand, in the conventional
aluminum honeycomb diaphragm, the first vibration mode and the second vibration mode of the
diaphragm having the same diameter as that of the above model occur at 950 Hz and 3800 Hz,
so the diaphragm according to the present invention is rigid. It is equivalent to the conventional
aluminum honeycomb diaphragm.
As described above, since the present invention is simple in terms of the shape compared to the
conventional diaphragm having a honeycomb structure as the core material, processing is easy
and cost reduction can be realized significantly, and the performance becomes lightweight. It has
the effect of improving the efficiency and eliminating harmful peaks.
Brief description of the drawings
1 is a view for explaining a method of manufacturing a honeycomb core used in a conventional
diaphragm, FIG. 2 is a plan view of the honeycomb core, FIG. 3 is a side view of a cantilever, and
FIG. 5 is a perspective view showing a part of the first embodiment of the core material of the
speaker diaphragm of the present invention, and FIG. 6 is a perspective view showing a part of
the second embodiment. FIG. 7 is a plan view showing a part of the second embodiment, FIG. 8 is
a plan view of a disc-like core, FIG. 9 is a plan view of a toroidal core, and FIG. 10 incorporates a
diaphragm according to the present invention FIG. 11 is a cross-sectional view of the speaker
unit, FIG. 11 is a graph based on measured data of sound pressure-frequency characteristics to
be described in detail according to the present invention, and FIG. 121 is a diagram of the
present invention using the finite element method. .
DESCRIPTION OF SYMBOLS 1 ... honeycomb core, 2 ... Chi · matrix beam, 3 ... uniform cross
section beam, 4 ... core material, 4a + 4c + 4e + 4f + valley part, 5, 5 '... skin material, 6 · · ·・
Coupling cone, 7 ... Discoil? ピン、8・・ゲイスコイル、9・・! Rate, IO ... Yoke, 11 ... Ma l ": F
y), 12 ... Danno e-113 · Engineering, 14 River Frame, 15 ... Speaker using the diaphragm of the
present invention Sound pressure-frequency characteristics of Uni, To, 16 ... Sound pressurefrequency characteristics of a speaker unit using a conventional aluminum honeycomb
diaphragm, 17, 18. 19. Vibration mode of the diaphragm. Figure 1 Figure 3 (0) Figure 4 Figure 5
Figure 6 Figure 7 Figure 8 Figure 9
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