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JPS57201398

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DESCRIPTION JPS57201398
Description 1, title of the invention
Flat speaker
3. Detailed Description of the Invention The present invention relates to an improvement of a flat
loudspeaker, in particular, a flat loudspeaker that drives the nodes of the primary divided
vibration (one nodal circle) of a flat diaphragm. A cross-sectional view of a flat type speaker
conventionally used is shown in FIG. Here, lO is a center ball with a center ball, and a ring-shaped
magnet 12 is fixed on the center ball 10, and a ring-shaped plate 14.7 frame 16 is fixed
sequentially on the magnet 12 . The outer periphery of an edge 18 is adhered to the inside of the
temple frame 16, and a flat diaphragm 20 is adhered to the inside of the edge 18. On the lower
surface of the diaphragm 20, a node 22 having the same diameter as the node of the primary
divisional vibration of the diaphragm 20 is fixed, and at the lower end of the bobbin 22, a voice
coil 24 is wound. At this time, the voice coil 24 is located in the magnetic gap of the magnetic
circuit formed by the center ball 1 o, the plate 14 and the magnet 12. A spider 26 is provided
between the periphery of the bobbin 22 and the inside of the frame 16. The operation of this
conventional flat loudspeaker will now be described. Since the voice coil 24 is located in the
magnetic gap of the magnetic circuit formed by the great 14 and magn 12 and the center ball
10) 1 (thereby, the diaphragm 20 and the hovin by passing an AC signal to the voice coil 24. 22.
The vibration system in which the voice coil 24 is integrated moves up and down to generate a
sound. In a flat plate speaker using such a circular flat diaphragm 20, the primary division of the
diaphragm 20 is intended to expand the reproduction band by flattening the output sound
pressure frequency characteristic (f characteristics). Methods for driving the nodes of vibration
(one nodal circle) are well known. The conventional flat-plate speaker shown in FIG. 1 uses the
hobin 22 having the same diameter as the node of the divided vibration. Furthermore, as another
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example conventionally used, there has been also a method of driving the nodes of the
diaphragm 20 via a sub cone (not shown) using the voice coil 24 having a diameter smaller than
the diameter of the nodes. In the case of the flat type speaker conventionally used as described
above, when it comes to a high-pitched or supersonic speaker, the material and structural surface
of the vibration system including the diaphragm 20 and the voice coil 24 etc. It can not be
reduced, or the effective magnetic energy of the voice coil 24 can not be secured, which causes
the efficiency of the speaker to be lowered. The present invention has been made in view of the
above-described conventional problems, and its object is to make the diameter of the voice coil
larger than the diameter of the node of the primary divided vibration of the diaphragm to secure
effective magnetic energy, and to improve the efficiency of the speaker. It is an object of the
present invention to provide a flat type speaker which prevents deterioration.
In order to achieve the above object, according to the present invention, in a flat plate speaker
for driving a node of a divided vibration in which one node circle of a flat diaphragm is
generated, a diameter of a voice coil for driving is divided into a diameter of a node of vibration It
is characterized in that the upper part of the hovin wound with the voice coil is fixed to the same
size as the diameter of the node of the divided vibration while being formed larger. A preferred
embodiment of the present invention will be described below based on the drawings shown in
FIGS. 2 to 4. The same members as those in FIG. FIG. 2 is a cross-sectional view showing an
embodiment of the present invention. In the figure, the diameter of the voice coil 24 is larger
than the diameter of the node of the primary divisional movement of the diaphragm 20, and the
hobin 22 wound with the voice coil 24 has a conical upper portion and an upper end And the
diameter of the node of the diaphragm 20 is the same as the diameter of the node of the primary
divided vibration of the diaphragm 20 and is joined to the diaphragm 20. By configuring the
voice coil 24 and the povin 22 as described above, it is possible to increase the volume of the
ratio voice coil 24 and hence the value of effective magnetic energy in the conventional flat panel
speaker, and the efficiency which is a drawback of the conventional speaker It is a book that can
prevent the decline. Furthermore, by increasing the diameter of the voice coil 24, the center ball
1o inevitably becomes large, so that the magnetic saturation at the center ball 1o can be reduced
and the leakage flux of the magnetic circuit can be reduced. . Therefore, the magnetic flux can be
effectively concentrated in the air gap of the magnetic circuit, and the effect of suppressing the
reduction in the driving force can also be achieved. The whole of the hovin 22Fi used in the
present invention may be integrally molded, or a cylindrical part and a conical part may be
joined. Also, as shown in FIGS. 3 and 4, a flange 28 can be provided at the upper end of the hobin
22. Further, the upper part of the hovin 22 can be formed in a reverse arm shape as shown in
FIG. 5 without providing a conical part. Of course, it is also possible to provide a flange at the
upper end edge formed in the shape of a reverse arm. As described above, according to the
present invention, since the diameter of the voice coil is arrowed from the diameter of the node
of the primary divided vibration of the diaphragm, the effective magnetic energy can be
increased, and the decrease in the speaker efficiency can be prevented.
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4. Brief Description of the Drawings FIG. 1 is a cross sectional view showing a conventional flat
loudspeaker, FIG. 2 is a cross sectional view showing one embodiment of the present invention,
and FIGS. 3 to 5 show a hobin and a voice coil. The diagrams are different from one another. In
the drawings, the same members are denoted by the same reference numerals, 2 o is a
diaphragm, 22 is a hobin, 24 is a voice coil. Agent Patent Attorney Shino Kuwano-(Others-Name)
EndPage: 2 Procedure Amendment (-Hu) Patent Office 1 Office 2 Name of Invention 2 Name of
Invention
Flat speaker
[Thousand I [clean speaker 3, correction person's subject column of the detailed description of
the object of correction specification, column of the brief description of the drawing. a. Contents
of the correction (1) As shown in Fig. S? Correct the bin 22JK. (2) “22 is hobin” in the
specification, page 6, line 14, f 22? 0 or more to correct the pin j EndPage: 3
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