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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the structure of a conventional papermaking apparatus, FIG. 2 shows the deposition of fibers in the paper-making apparatus, and FIG.
3 shows the structure of a conventional molding die Fig. 4 shows the structure of the
papermaking apparatus of the present invention, Fig. 5 shows the structure of the paper net
employed in the papermaking apparatus, and Fig. 6 shows the state of fiber deposition in the
papermaking apparatus. Fig. T is a view showing the structure of a speaker diaphragm
manufactured by the same paper-making apparatus. 6 is a woven mesh, T is a ring-shaped band.
1st K 2nd bile-91-practice opening 51-79336 (2) 3rd fire Fig. 4 5th chain 6th hi voice chopstick
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DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for
forming a speaker diaphragm, and more specifically, to form a predetermined number of ringshaped bands having a low fiber density at the same time as forming a diaphragm. It relates to a
papermaking apparatus. The diaphragm of the cone-shaped speaker based on the paper fiber
exhibits various vibration modes in the divided vibration region, and peaks and dips occur in the
pigeon wave number characteristics, causing deterioration of the sound quality. In particular, in
the case of a diaphragm of free edge type, at the time of edge resonance, the material of the edge,
1/2 thickness, shape, size, density, etc. is received, and a portion inside the edge sticking portion
of the cone portion It exhibits a vibration mode with a node. According to the experimental
results, the nodes generated at the cone portion at the time of the edge resonance are generated
at a portion 3 to 15 inside from the outer peripheral edge of the cone in a general diaphragm
with a diameter of 16 to 25 cIH. There is a sharp peak or dip in the frequency characteristics
when the node at the edge resonance is inward from the outer peripheral edge of the cone, and
the influence of the edge also occurs in the higher-order divided vibration at higher frequencies
as well. As a result, peaks and dips occur in the frequency characteristics, and a good reproduced
sound can not be obtained. For this reason, conventionally, in order to flatten the frequency
characteristics, various measures have been taken such as providing corrugations of various
magnitudes at predetermined positions of the cone portion in a manner to make the frequency
characteristics flat. It was diverse. In general, as shown in, for example, an eleventh embodiment,
a diaphragm having a corrugation sun has a predetermined number of semicircular crosssections of a cross-sectioned semi-circular corde 21 in a predetermined position on a paper mesh
2 provided in a papermaking tank l. 3 is made using a paper making apparatus which has been
formed, and then it is completed by either heat drying or pressing □ -forming. However, in such
a papermaking apparatus, as shown in FIG. 2, more fibers are deposited unevenly in the cut
portion of the corrugation section 3 of the screen 2, and the arrangement and density of the
fibers are different. It tends to become uneven, etc., and also it is easy to produce variation in
fiber deposition, alignment, density, etc. between mass-produced diaphragms during sheet
production, and also in the case of press forming by peeling from the paper screen 2 It is
extremely difficult to make the required compliance of the Korde 21 part of the completed
diaphragm extremely difficult, and it has the disadvantage that the mass production will be
varied, etc., and the quality is stable. It was difficult to obtain a vibrating plate. Further, after
making up the papermaking network 2 not forming the corrugation portion 3 described above
with the paper making apparatus provided, the press forming mold 5 in which the concave
corrugation portion 4 is formed as shown in FIG. The diaphragm which is formed by pressing the
corrugation 1 by pressing all the surfaces except the corrugation day, and the formation of the
corrugation 1 has disadvantages such as that the forming die 5 has to be subjected to an extra
processing etc. The
In view of these points, the present invention eliminates as much as possible of irregularities
during corrugation formation, and concentrically forms a ring-shaped band in which only a small
fiber phase variation having the same function as conventional corrugation at the same time as
diaphragm sheet forming is concentrically formed. The present invention provides a paper
machine for forming paper. In FIG. 4 and the following figures, 1 is a papermaking tank, and 6 is
a cone-like paper mesh which is the same as a diaphragm to be made. Extraction 111! 6 are
formed with the conventional corrugation gin 3 shown in FIG. 1 and FIG. In addition to the inner
position, a predetermined number of ring-shaped bands 7 having a predetermined width, which
does not pass through the sheet-making water in which the diaphragm fibers are suspended, are
formed concentrically at predetermined positions in the inner portion from the position. The
ring-shaped band 7 can be easily formed by applying an adhesive system mixed with gold
powder or silver powder at a predetermined position of the paper mesh 6 in a ring-like manner.
According to the paper making apparatus equipped with a structure @ 6 of this structure, as
shown in FIGS. 6 and 7, when the diaphragm 8 is made, the ring formation 7 of the paper net 6 is
simultaneously made. The fiber deposition amount, that is, the rate of change of fiber density in a
portion is uniform, and a predetermined number of concentrically formed lower bands of fiber
density 7 'are formed in a concentric fashion as compared to the other portions. It is then dried
by heating or pressed and completed. □□。。 r61CLT−Lt=IiEaIli811!
The fiber density of the I7F □ 7 'part is smaller than that of the other part, or the change in the
1' fiber density is either uniform or uniform or 0. · It has remarkably uniform compliance
compared to the conventional corrugation Also, the variation during mass production is
extremely small, and by appropriately determining the formation position and the width of the
ring-shaped band 7 ', it is possible to easily control the vibration mode of the diaphragm 8 so that
the divided vibration occurs regularly. In other words, complex and abnormal vibration modes
can be suppressed and peaks and dips of the frequency characteristic can be effectively removed.
In particular, the node portion of the vibration mode at the time of the edge resonance, that is,
the outer peripheral edge of the cone or the like, slightly inward (3 to 15. Since a ring-shaped
band 7 'having an ans and a compliance h is formed at the position of n), it is possible to
effectively suppress the negative influence of the six-edge resonance on the abdominal area of
the cone portion, and the frequency characteristic is made flatter. It can be turned on. Also,
unlike the diaphragm in which a corrugation sheet having a semicircular cross-sectional shape is
formed by press forming using a paper making apparatus in which the corrugation part 3 is
formed in the conventional paper making net 2, the ring formation of the paper making net 6 is
completely different. Since the density and the deposition state of the fibers deposited on the
upper surface of the band 7 are uniform, it is possible to form a ring-shaped band 7 'having the
same function as the conventional corrugation with uniform compliance and stable high quality A
motorized board can be realized.
Furthermore, the ring-shaped band 7 of the mesh 2 can be easily formed, and there is an
advantage that the corrugation portion 3 is formed as in the prior art, or that the press forming
die 5 does not need to be subjected to extra processing. In the above example # 1, if a damping
agent such as an acrylic resin is applied or impregnated to the ring partition 7 'portion of the
completed diaphragm 8 as necessary, the internal loss of this portion 7'8 increases. The
resonance of the edge is easy: t: ': r: It is also effective to increase the bending resistance of the
fiber and to increase the bending strength of the fiber. As described above, since the present
invention forms the ring-shaped band 7 which does not pass water for paper making at all so
that the density of fibers deposited on the paper making net 6 becomes small, it is identical to the
conventional Corrugian at the same time with diaphragm paper making. The diaphragm 8 having
the ring-shaped band 7 'having a uniform function in mechanical vibrational characteristics can
be realized, and peaks and dips due to the influence of the edge and other resonances can be
remarkably suppressed on the frequency characteristics. If a speaker diaphragm is completed
using the device, a speaker with excellent characteristics can be provided.
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