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JPS5718198

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DESCRIPTION JPS5718198
Description 1, title of the invention
Electrodynamic speaker
3. Detailed Description of the Invention The present invention relates to an electrodynamic
loudspeaker using a rectangular flat diaphragm, and an object thereof is to expand a
reproduction band. FIGS. 1A and 1B show a conventional electrodynamic speaker of this type. In
FIGS. 1A and 1B, reference numeral 1 denotes a yoke in which a center ball 2 is integrally
formed, and the yoke 1 is fixed in a frame 3. An annular magnesite 4 is fixed to the upper surface
of the yoke 1 and an annular plate 5 is fixed to the upper surface of the magnet 4. The inner
peripheral surface of the plate 6 and the outer peripheral surface of the center pole 2 An annular
magnetic gap is formed therebetween. Reference numeral 6 denotes a rectangular flat
diaphragm, and the outer peripheral portion of the diaphragm 6 is supported by the frame 3 via
the edge member 7. A cylindrical coil bobbin 8 is fixed to the center of the lower surface of the
diaphragm 6, and a voice coil 9 is wound around the coil bobbin 8 by EndPage: 1. The voice coil
9 is disposed in the magnetic gap. 10 is a damper for supporting the coil bobbin 8. FIGS. 2A and
2B show the vibration modes of the diaphragm 6 of the above-mentioned conventional dynamic
speaker. When an electric signal is supplied to the voice coil 9, vibration occurs, and the
diaphragm 6 is driven by the coil bobbin 8 to vibrate, but the frequency f. In the vibration mode
M, two node lines ml and m2 parallel to the short side of the diaphragm 6 are generated. Also,
when the frequency becomes higher than f1 and becomes f3, the diaphragm 6 has four node
lines n, n, n3, n3. This is the vibration mode N in which n occurs. In this type of speaker, the
reproduction band is determined by the frequency at which the vibration mode occurs. FIG. 3
shows the sound pressure frequency characteristics of the above-mentioned conventional
dynamic speaker. In FIG. 3, f is the frequency at which the vibration mode M in FIG. 2 occurs, and
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f3 is the frequency at which the vibration mode N occurs. Peaks of sound pressure occur at
frequencies f and f3. As is apparent from FIG. 3, the reproduction band of the conventional
electrodynamic speaker described in-is a flat J'r (a band up to a frequency f). In general, a
speaker using a rectangular flat diaphragm is lower in fl + f3 than a cone speaker. As described
above, the conventional moving 7E-sp has a narrow band. The present invention eliminates the
disadvantages of the prior art and extends the regeneration band, and an embodiment of the
present invention will be described below with reference to FIGS. 4A, 4B and 5A, 5B. The same
reference numerals as in FIGS. 1A, 1B and 1B denote the same parts as those in FIGS. 1A, 1B and
1C.
4A and 4B, 1 "is a yoke, 21 is a center pole, 41 is an annular magnet, 5 ░ is an annular plate, 81
is a coil bobbin, 9'u voice coil, 10" is a damper, 2 pieces The diaphragm 6 is driven by a magnetic
drive mechanism similar to the above. FIGS. 5A and 5B show the relationship between the coil
bobbin 8 in the above embodiment and the attachment portion to the diaphragm 6 at 8 DEG and
the vibration modes M and N in the prior art. As apparent from FIGS. 5A and 5B, in the present
embodiment, in the vibration mode M generated at the frequency f1 when the central portion of
the rectangular flat plate diaphragm 6 is driven as in the conventional example. It is fixed to the
nodal line m, and the other coil bobbin 8 'is fixed to the nodal line n4 in the vibration mode N
generated at the frequency f3 when driving the central part of the rectangular flat plate
diaphragm 6. is there. Thus, when driving the node line portion generated at the frequency f1
and the node line portion generated at the frequency f3, the disturbances of the sound pressure
at the frequencies f, f in the sound pressure frequency characteristic as shown in FIG. Can be
suppressed to an extent that poses no problem in practical use, and the reproduction band can be
further extended to a higher order resonance frequency IH. 7A, 7B and 8 show another
embodiment of the present invention. In this embodiment, the diameter of the coil bobbins 8 and
810 is increased to drive the joint line nl and m by the coil bobbin 8, and the joint line m2.n4 is
driven by the coil bobbin 8 ". In the present embodiment, as shown in FIG. 8, a portion of the
upper edge of the coil bobbins 8, 8 ? ? which is not in contact with the nodal line (the two flats
improve sound pressure flatness. FIGS. 9A and 9B show still another embodiment of the present
invention. In this embodiment, the small end of the substantially frusto-conical cylindrical body
11, 11 'is fixed to the coil bobbin 8, 8', the large end is fixed to the diaphragm 6, and the
cylindrical body 11KJ: The nodal line m2.n4 is driven by the drive 1 to the cylindrical body 11 ?
?, and according to this embodiment, the reproduction band can be expanded. The present
invention is configured as described above, and according to the present invention, it has the
advantage of being able to expand the reproduction band of the electrodynamic speaker using a
rectangular flat diaphragm.
4. Brief description of the drawings. FIGS. 1A and 1B are a top view and a side cross sectional
view, respectively, of a conventional dynamic 7L type speaker. FIG. 2B is a diagram showing a
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vibration monitor of a diaphragm of the same speaker. The figure is the sound pressure
frequency characteristics of the same speaker, Fig. 4C, Fig. 4B are the -F view and side sectional
view of the electrodynamic speaker in one embodiment of the present invention, and Figs.
EndPage: 2 parts of-a view and a side cross sectional view, Fig. 6 shows the sound pressure
frequency characteristics of the same speaker, and Figs. 7A and 7B are a top view and a side
cross sectional view of the main part of another embodiment of the present invention Figure 8 is
a perspective view of the coil bobbin of the same speaker, Figure 9A. B is a top view and a side
sectional view of a main part of still another embodiment of the present invention. 1.11 и и и Yoke,
2.2 ? и и и и Center ball, 3 и и и Frame, 4.4 ? и и и Magnet, 5.5 ? и и и и Plates 6: Rectangular flat
diaphragms 7. Edge members 8, 81: Coil bobbins 9.9 ': Voice coils 10, 101. ииииии Tamper-111, 11 'и
и и и и и и Name of the agent ? Attorney Nakao Toshio and others 1 person Figure 1 Figure 2 Figure
3 Liquid bottle (qz) Figure 4 EndPage: 310 -3c0CD ? ? Figure 8 Figure 9 EndPage: ?
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