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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.
The present invention relates to a flat speaker, and an object of the present invention is to
provide a flat plate capable of faithfully transmitting to a flat diaphragm a driving force
generated in a voice coil supported for piston movement in a magnetic gap constituting a
magnetic circuit. It is to provide a speaker. In general, it is ideal for the speaker diaphragm to
perform a complete piston movement in the frequency band to be used, and if the diaphragm is
deformed during vibration or split vibration occurs, the sound pressure frequency characteristics,
distortion factor 1 phase characteristics, etc. And high fidelity reproduction can not be expected.
In order to solve these problems, in recent years, a plane diaphragm of a sand-inch structure
having a honeycomb structure as a core material has been adopted. If a method is used in which
a bobbin provided with a voice coil is attached to a joint portion at the first resonance frequency
of this flat diaphragm and driven, the first resonance is canceled and the high frequency limit
frequency J'h is significantly increased. It can be increased. However, since the diameter of the
nodal circle is usually about 66% of the diaphragm outer diameter, the voice coil has a large
diameter as compared with the conventional one, and therefore the weight of the voice coil is
increased and the efficiency of the speaker is reduced. I am in charge of doing it. In addition, the
magnetic circuit for driving the large diameter voice coil is also a special large size, which is
costly. In order to solve these problems, a method in which the conventional thick voice coil and
the intranode section of the flat diaphragm are connected by a cone-shaped compring body is
effective and adopted. However, in the method using the cone type coupling body described in-, it
increases the portion of the cone type cascading body and the process of connecting this to the
bobbin provided with the voice coil), H is Since the cost increases due to the increase, the bobbin
provided with the voice coil and the cone type campling body are connected via the adhesive, the
adhesive transfers the vibration energy by absorption There was a problem that it was inevitable.
The present invention solves such a conventional defect, and integrates a cone portion joined to a
circle of a first J1 vibration frequency of a flat diaphragm and a bobbin for winding a voice coil,
The present invention provides a flat speaker in which the driving force generated in the above is
transmitted to the flat .quadrature. Diaphragm by reducing the transmission loss. Hereinafter, the
flat loudspeaker of the present invention will be described with reference to the drawings of the
embodiments. FIG. 1C shows an embodiment of the flat speaker according to the present
invention, in which 1 is a 1 nibrate, 2 is a lower play 1 with a center ball 3 at the center, 4 is 1 b.
-An annular McNe, a rod provided between the lower plate 2 "-Constructs a magnetic circuit with
a magnetic gap 5 between the outer peripheral portion of the center ball 3 and the inner
peripheral surface of the North upper plate 1 doing.
The reference numeral 6 denotes a coupling body in which the cone portion 7 and the bobbin
portion 8 are integrally formed, and the voice coil 9 is wound around the outer periphery of the
bobbin portion 8. The coupling body 6 is supported by a damper 11 on a frame 10 provided on
the heat plate 1 so that the voice coil 9 can be moved in a piston in the magnetic gear tube δ. A
flat diaphragm 12 has a cone portion 7 of the coupling body 6 joined to a nodal position of the
primary resonance frequency. The flat diaphragm 12 is supported by the edge 13 so as to be
able to move on the frame 10. The coupling body 6 has, as shown in FIGS. 2 and 3, a plurality of
radial ribs 14 extending in the axial direction in its cone portion 7, and the outside of the wavy
circle formed by the radial ribs 14 It is joined so that the node circle of the plane diaphragm 12
is located in the middle of the circle and the intrinsic position. The coupling body 6 is formed, for
example, by molding an inorganic filler-polyarylate resin film of 150/1 m into a cylindrical
shape, and then forming one open end into a cone shape by hot pressing. The sound frequency
characteristics of the flat speaker configured in this manner are measured at 1 m / 1 W in a JIS
standard BOX, and are shown by curve A in FIG. In FIG. 4, curve B represents the sound pressure
frequency characteristics of the conventional flat speaker in which the bobbin and the cone are
separate bodies. In the flat speaker configured as described above, since the coupling body 6 has
the cone type coupling body and the voice coil bobbin integrated, the voice coil 9 is wound and
provided as one component. And by this integration, the reduction of a number of parts and the
adhesion | attachment process of a cone type | mold campring body and a bobbin can be
skipped. Further, the driving force generated in the voice coil 9 can be faithfully transmitted to
the flat diaphragm 12 by reducing the absorption of the vibration energy by the adhesive by the
integration. Further, since the coupling body 6 is provided with the radial rib 14 extending in the
axial direction in the cone portion 7, the bending rigidity of the cone surface is greatly increased,
and the partial resonance of the cone surface can be suppressed. It contributes to the increase of
frequency fh and the reduction of distortion. Since the wave cone of the campling body 6 is
connected to the in-node part of the plane diaphragm which appears as a perfect circular shape,
the nodal circle can be apparently dispersed, and a simple cylindrical camp ring is performed. In
this case, the resonance peak can be reduced as compared with the case of FIG. When the abovedescribed integral type coupling body 6 is used, the resonance peak is reduced to about half of
the conventional one and the high frequency limit frequency C is also raised, as can be seen from
In the above embodiment, the radial lip 13 is provided on the cone portion 7 of the coupling
body 6 to form a corrugated cone, but it may be a circular cone. According to the present
invention as described above, according to the present invention, there is provided a bobbin
portion on which a voice coil moving in a screw motion in a magnetic gap constituting a
magnetic circuit is wound, and a nodal circle of a first resonance frequency of a planar
diaphragm. The coupling body integrally formed with the cone portion joined to the position 1t
′ ′ ′ ′ is configured to transmit the driving force generated in the voice coil to the open
plane diaphragm, so that the conventional bobbin and Compared with the case of using a
coupling body in which I: is bonded with an adhesive, it has an advantage that absorption of
vibrational energy by the adhesive can be reduced and reliable transmission of driving force can
be performed.
Brief description of the drawings
1 is a cross-sectional view showing an embodiment of the flat speaker of the present invention,
FIG. 2 is a front view of a coupling body used for the speaker, FIG. 3 is a cross-sectional view
taken along the line A-A ', FIG. These are the comparison characteristic curve figures of the sound
pressure frequency of the flat speaker of this invention, and the conventional flat speaker.
6 ...... magnetic gap, 6 ...... can bring body, 7 ...... cone portion, 8 ... bobbin portion, 9, former voice
coil, 10 ... ... Fureno 2.11 ... India and damper, 12 ...... flat diaphragm, 13 ...... edge, 14 ...... radial
descriptor. Figure 1 Figure 2 Figure 3
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