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JPS57166486

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS57166486
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a top view of a conventional flat diaphragm,
FIG. 1 is a cross sectional view thereof, and FIG. 2 is a diagram showing a vibration mode at the
time of resonance of a rectangular flat diaphragm, The figure is a perspective view showing an
example of one structural acid of the flat diaphragm of the present invention, and FIG. 4 is a
comparison characteristic diagram of the sound pressure frequency characteristics of the
electrodynamic speaker using the diaphragm of the present invention and the prior art. FIG. 5
shows an example in which the diaphragm of the present invention is incorporated into a
speaker, where a is a plan view and b is a sectional view. 1.2 · · · · · Surface material, 31 · · · · · · · · ·
· · · · · · · diaphragm.
[Detailed description of the invention] The present invention relates to a flat diaphragm for
loudspeakers, and its purpose is to increase the bending rigidity of the rectangular 0-plane
diaphragm in the longitudinal direction). The purpose is to expand the reproduction band of the
speaker, and to improve the “efficiency” of the speaker by reducing the weight of the flat
diaphragm. In the case of an electrodynamic loudspeaker having an entire rectangular planar
diaphragm having a size ratio of longitudinal to lateral dimensions of 1: 2 or more, the high
frequency limit is generally caused by the split resonance in the longitudinal direction of the
diaphragm. Since it is decided, the node drive system in which the node at the time of resonance
of the diaphragm is driven by the voice coil is entirely adopted, thereby damping the resonance
in the lower order and expanding the reproduction band. Fig. 1 + lLl, + bl is an assembly drawing
of the diaphragm and voice coil of the node drive type speaker using the conventional
diaphragm. In FIG. 1, the diaphragm has a sandwich structure in which a core material 3 of a
honeycomb structure having a hexagonal cell shape is used and a surface material 1.2 is bonded
to the upper and lower surfaces. Also, the voice coil 4 loses during the primary resonance of the
diaphragm 1. The two nodes a, b2 are in contact with the two nodes a, a2 at the same time, and
two voice nodes simultaneously drive the two nodes. FIG. 2 shows the @ motion mode at the time
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of resonance of the conventional diaphragm shown in FIG. 1, where m is the vibration mode at
the first inter-resonance wave number f0 where there are two nodes, and B is four nodes. 3. The
second resonance same wave number f 2 is “3. This resonance can be damped by node driving
of the vibration mode in the above-mentioned first resonance interrogation fl, and the highfrequency reproduction limit as a speaker can be expanded to the second inter-resonance
resonance f2. However, in the above-described conventional diaphragm, in order to increase the
high frequency limit same wave number f2, it is necessary to increase the rigidity of the core
material of the nick structure, and a gold material such as aluminum is used. Moreover, since it is
difficult to make the material thickness (about 20 μm) to a certain extent or less by the head
during manufacturing, the weight of the diaphragm is also increased, which reduces the
efficiency of the speaker. As other conventional diaphragm materials, the weight reduction of the
diaphragm is achieved by using a styrene-based foam as the core material, but it is difficult to
increase the rigidity, and both of the resonant frequency numbers' 1r'2 are low, The regeneration
zone as a speaker is reduced to 礪 or less as compared with the one using a honeycomb core. The
present invention improves the rough points between the above, and the following describes the
present invention.
FIG. 3 shows an embodiment of the shaking plate of the present invention. In FIG. 3, 31 is a tapelike core material made of metal foil such as 11: S3434-aluminum or titanium, or a polymer film
such as polyester or polyvinyl chloride, and both ends of this tape-like core material 31 are
shown. A surface material 1.2 made of aluminum, plastic or the like similar to the abovedescribed conventional diaphragm is poured on the edge. The diaphragm stands vertically to the
surface of the surface material 1.2, and is pulled in the longitudinal direction of the surface
material 1, and by repeating folding by providing a small radius at its end, the longitudinal
direction is obtained. A plurality of reciprocating wood tapes are provided, and the upper and
lower surfaces thereof are bonded to the upper and lower surface materials 1.2 with an adhesive
to form a sandwich structure. As apparent from the above-described vibration mode of the flat
diaphragm at the time of resonance, in the rectangular flat diaphragm, it is important to increase
the bending rigidity in the longitudinal direction in order to increase the inter-resonance wave
loss. Therefore, as in the conventional diaphragm shown in FIG. 1, it is not necessary to connect
the core material in the honeycomb structure to the core side in the direction of the short side of
the diaphragm at all. 11 and 60 can obtain equivalent bending stiffness. In addition, since the
structure of the core material is very simple, it is easy to manufacture and excellent in mass
productivity. Further, in the diaphragm of this example, as compared with the conventional
diaphragm as described above, since there is no extra core material in the short side direction,
the efficiency of the speaker can be improved by reducing the weight. FIG. 4 shows that the
diaphragm of this embodiment and the conventional diaphragm are incorporated into a hightone speaker having dimensions 361111 × 17 謡 of the diaphragm, and the sound pressure
between them? The characteristics of the IIL are all characteristics, and the thickness of the
diaphragm is 1181. The material of the surface material and the core material is aluminum, and
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the material thickness is 20 μ each. The diaphragm weight in this example is 12019. The
conventional product is 150'q. As seen from the characteristics of FIG. 4, the efficiency was
improved by about 1 dB. Fig. 5 flLl, fbl is a structural view of the diaphragm of the present
invention incorporated into a speaker, 9 is a center pole, 8 is a yoke integrally formed, 7 is an
annular yagnet fixed on the yoke 8, 6 Is an annular plate fixed on the magnet 7, and a magnetic
cap cover is formed in the dark between the inward surface of the plate 6 and the outer
peripheral surface of the center ball 9. The bottom 6 of the frame 6 The scissors are fixed to the
plate 6. The rectangular flat diaphragm 12 is supported by the edge member 4 on the frame 6.
A coil bobbin 1o is fixed to the lower surface of the diaphragm, and a voice coil 11 is wound
around the coil bobbin 10. The voice coil is inserted into the magnetic gap. As described above,
according to the present invention, since a plurality of tape-shaped core members orthogonal to
the surface materials are folded back in the longitudinal direction in the middle gate of the upper
and lower surface materials, the bending rigidity in the longitudinal direction is increased and the
regeneration zone In addition, since the core material in the short side direction can be reduced
compared to the honeycomb structure, the weight can be reduced, and the speaker efficiency can
be improved. .
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