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JPS5765095

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DESCRIPTION JPS5765095
Description 1, title of the invention
Electrodynamic speaker
3. Detailed Description of the Invention The present invention relates to an electrodynamic
speaker using a rectangular flat diaphragm, and provides an electrodynamic speaker capable of
obtaining flat sound pressure frequency characteristics up to a high frequency range. FIGS. 1a, b
show a conventional electrodynamic loudspeaker of this kind. 1a and 1b, 1.1 'is a yoke integrally
formed with a center pole 2.2', 3.3 'is an annular magnet fixed on the yoke 1.1', 4.4. 'Is an
annular plate fixed on the magnet 3.3', and an annular magnetic gap is formed between the inner
peripheral surface of the plate 4.4 'and the outer peripheral surface of the center ball 2.2'. It is
formed. The two sets of magnetic circuits are fixed to the bottom of the frame 6. Reference
numeral 6 denotes a rectangular planar vibration-plate, which is supported by the edge member
7 at the opening of the frame 5. A coil bobbin 8.8 'is fixed to the lower surface of the diaphragm
6, and a voice coil 9.9' is wound around the coil bobbin 8.8 ', and the voice coils 9, 9' are inserted
into the magnetic gap It is done. 10.10 はダンパーである。 FIGS. 2a and 2b show
vibration modes at the time of resonance in free vibration of the rectangular flat diaphragm of
the conventional speaker. In FIG. 2, A indicates a vibration mode at the resonance frequency f1.
In this vibration mode A, EndPage: 1: as shown in FIG. 2A, substantially parallel to the short side
of the diaphragm 6 Two clauses A1. A2 occurs. B in FIG. 2 indicates a vibration mode at the
resonance frequency f3. In this vibration mode B, as shown in FIG. 2 a, four nodes B substantially
parallel to the short side of the diaphragm 6, B2. B3. B4 is generated. In the conventional
speaker shown in FIG. 1 alb, the coil bobbin 8.8 'is fixed to the above-mentioned section A 1.84.
When the section is driven by the coil bobbin 8.8' in this way, As a result of damping the
vibration modes A and B at the resonance frequency f1ef3Vc, the peak of the sound pressure
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does not occur at the resonance frequency as shown in FIG. 3, and the reproduction band is
expanded to the high-order resonance frequency fH. is there. However, in the above-described
conventional example, since the driving point for driving the diaphragm 6 is asymmetrical, as
shown in FIG. 3, there is a disadvantage that a dip in sound pressure occurs due to resonance at
f2 between the frequencies f1 and f3. The This f2 d disc is generated because the driving point of
the diaphragm 6 is asymmetrical, and its vibration mode is three nodes (C1, C2, C3) as shown by
C in FIG. It is said that the asymmetrical mode in which is generated, and deteriorates the flatness
of the sound pressure frequency characteristic.
The present invention eliminates the above-mentioned conventional drawbacks, and one
embodiment of the present invention will be described below with reference to FIG. In FIG. 5, the
same parts as those of the prior art are denoted by the same reference numerals. The driving
points of this embodiment are nodes A1 and B4 as in the prior art, and the coil bobbin 8 'is fixed
to the node A1 and the coil bobbin 8 is fixed to the node B4 for driving. The feature of this
embodiment is that the damping material 11 is adhered to the lower surface of the diaphragm 6
between the mounting position of the coil bobbin 8 for driving one node B4 in the vibration
mode of frequency f3 and the center of the diaphragm 6 The point is. This bonding point is the
point at which the amplitude of the vibration mode C at the asymmetrical mode produced by the
asymmetrical drive, that is, at f2 shown in FIG. 4 becomes maximum. As in the present
embodiment, when the damping material 11 having a large internal loss such as rubber is
adhered, the energy of resonance at the frequency f2 is absorbed, the resonance is damped, and
as shown in FIG. The dip at the point is eliminated, and a flat sound pressure frequency
characteristic is obtained. FIG. 7 shows another embodiment of the present invention. In this
embodiment, the attachment portion of the damping member 11 in the above embodiment is an
end portion on the side of the coil bobbin 8 attached to the diaphragm 6. The attachment place
of the damping material 11 in FIG. 7 is also a place where the amplitude of the vibration mode at
the frequency f2 shown in FIG. 4 is large. FIGS. 8a and 8b show the shape of the damping
member 11 in the speaker of the present invention. The length 2 of the damping material 11 is
substantially the same as the length of the short side of the diaphragm 6. The shape of the
damping member 11 is limited to the shape shown in FIGS. 8a and 8b +, it may be another shape,
and it is not necessary to make the length equal to the length of the short side of the diaphragm
6 It is a thing. The present invention is configured as described above, and according to the
present invention, a flat sound pressure frequency characteristic can be obtained up to high
frequencies.
4. Brief description of the drawings FIG. 1a is a top view of a conventional electrodynamic
speaker, FIG. 1 is a sectional view of the same speaker, and FIG. 2a is a diagram showing nodes of
a rectangular flat diaphragm, Fig. 3 shows the vibration mode of the diaphragm, Fig. 3 shows the
sound pressure frequency characteristic of the conventional electrodynamic speaker, Fig. 4
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shows the asymmetric mode of the conventional electrodynamic speaker, Fig. 5 6 is a crosssectional view of an electrodynamic speaker according to an embodiment of the present
invention, FIG. 6 is a sound pressure frequency response of the speaker, and FIG. 7 is a side
sectional view of an essential part of another embodiment of the present invention 8 Figure a. b
is a perspective view which shows the example of the damping ¦ braking material used for the
electrodynamic-type speaker of this invention, respectively. 1 @ 1 +@11@111ヨー
ク、2、2 、、、、、、センターポール、3、3 、6*、、、マグネット、
4,4′01119. Plates 5..., Frames 6,..., Rectangular flat diaphragms 7,..., Edge members,
8.8 ′ ′. 0.1, 1 coil bobbin, 9.9 ', am + voice coil 、, 10, 10' ,,,,,, Damper, 11 ,,,, End EndPage: 2
moving material. Name of agent Attorney Nakao et al. 1 person Fig. 1 Fig. 2 Fig. 1113 周-, 庚 F
(Taku) Fig. 4 End Page: 3 @ 5 Fig. 6 Fig. 7 tT 政 (H 2 第 7 9'9 EndPage: 4
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