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JPS57135192

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DESCRIPTION JPS57135192
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a conventional
cone-shaped speaker, FIG. 2 is a cross-sectional view of a cone-shaped diaphragm, and FIGS. 3 a
and 3 b. FIG. 4C is a cross-sectional view showing a conventional flat panel speaker, FIG. 4 is a
cross-sectional view showing a flat panel speaker according to an embodiment of the present
invention, and FIG. 5 is an embodiment of the present invention shown in FIG. FIG. 3 is a graph
showing sound pressure-frequency characteristics of each of the flat loudspeaker according to
the present invention, the conventional cone loudspeaker using a paper cone, and the
conventional flat loudspeaker shown in FIG. 3C. DESCRIPTION OF SYMBOLS 10 ... Flat speaker,
11 ... Ring-shaped flat plate 12 ... Voice coil, 13 ... Edge, 14 ... Spider, 15 ... Magnetic circuit part,
16 ... Cone diaphragm , 18 ... circular plate, 19 ... plate diaphragm. In the drawings, the same
reference numerals indicate the same or corresponding parts.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a wide band
speaker driving a node of split vibration of a flat plate-like moving plate. Sex one injection и ?! 5
и, и t Pa - 'conventional cone speaker cone has been used often by obtained a relatively wide
piston area since structurally strong. However, this type of speaker causes a dip in sound
pressure-frequency characteristics due to a cone-shaped dent effect. On the other hand, the
followings are put to practical use as flat plate speakers. One is a method of directly driving the
nodes of the axisymmetric split vibration of a flat diaphragm with a die coil of the same diameter,
and then the nodes of this flat diaphragm are driven by a cone diaphragm, and a cone shape
There is one in which the front cavity portion of the diaphragm is filled with a foam material and
the surface is flat. Among these flat-plate speakers, the first method is superior in various
properties including the wide reproduction band, but since the voice coil becomes large,
problems with the magnetic circuit, eccentricity of the die coil, etc. In addition, there were
problems such as difficult assembly. In addition, when driving the nodes of the flat plate with the
second cone diaphragm, it is difficult to obtain a wide reproduction zone due to the rigidity
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problem of the cone diaphragm, etc. There was a drawback. As a matter of fact, the method in
which the inside of the cone diaphragm is filled with the foam material has a problem that the
weight of the foam material lowers the high frequency resonance frequency. As described above,
in the case of the conventional loudspeaker, the cone-shaped loudspeaker has a dino due to the
concave effect due to the cone shape on the sound pressure-frequency characteristics, and in the
case of the flat-plate loudspeaker, the reproduction band width and the assembly problems And
so on. The problems with such conventional spill force will be described with reference to the
drawings. FIG. 1 shows a cross section of a conventional cone-shaped speaker, and in FIG. 1,
reference numeral l indicates a cone-shaped diaphragm. , 2 drive this diaphragm? 3 coil is an
edge supporting vibration input = 1, 4 is a spider connected to the coil 2 and serves to improve
the linearity of the diaphragm 1 and coil 2, and 5 is a magnet for driving the coil 2. The circuit
part is shown, respectively. In the conventional cone-shaped speaker configured as described
above, since the rigidity of the cone shape itself is large, it is possible to obtain a wide 3 1045
piston vibration area. And the shape as shown in FIG. 2 (3a = lQ3. R1) A diameter of 25011 (here,
diaphragm radius!) With one = 4 cm + "= lb'? = 55 ░).
?????????? Axisymmetric primary division vibration frequency f1 of the cone-shaped
Noubika) is 1 = east pressure width ии Rt (Rt?-6 и) Lt и 10.7) ? ? 2 rRa) 4.8273 (11) If, as a
constant of a typical natural fiber, Young's modulus E =] О 10 ? ? dyne / cyl + density == O, 3t
/ ? and numerical values of the shape shown in FIG. It becomes + -1800R2 (however, the
influence of an edge is disregarded here). In addition, since a drop on the sound pressurefrequency characteristic due to the concavity effect of the cone occurs when Ka = 2?a / ? is 2
to 3, a drop occurs from around the use band of 1000 Hz (here, K: Phase constant, ?:
wavelength). Furthermore, FIGS. 3 (a), C), and (C) show flat type loudspeakers having the same
aperture as the above-mentioned cone type loudspeakers, and FIG. 3 (a) shows axially symmetric
division of the flat plate-like moving plate. I think of the node of vibration, 42. 1046 In this
system, the same diameter is directly driven by chair coil. Fig. 3 (b) is a system in which the node
of the flat diaphragm is driven by a cone diaphragm, and Fig. 3 (C) is a cone. The thing of the
system which filled the front cavity part of the diaphragm with the foam material is shown,
respectively. In this flat-plate speaker shown in FIG. 3A, if the same reference numerals are given
to the same or corresponding parts as the cone-shaped speaker shown in FIG. Is a flat diaphragm,
2 is a voice coil which directly drives this node at the same outer diameter as one of the nodes
which can be made of the axisymmetric divided vibration of this diaphragm 6, 3 is an etsoe
which supports the diaphragm 6, 4 is a 4 spiders are connected to the voice coil 2 and serve to
improve the linearity of the diaphragm 6 and the voice coil 2, and 5 shows a magnetic circuit
unit for driving the voice coil 2, respectively. In the conventional flat-plate speaker configured as
described above, since the nodes of the axisymmetric primary divided vibration of the flat
diaphragm are driven, the primary divided vibration does not occur. The first split vibration has a
secondary resonance, and one example of a diaphragm: a large 510.1 ',' Niclam 'structure with a'
GFRP (glass fiber reinforced plastic) 'skin, radius a = 10?, thickness t = 5 M, 1! // ? -1, 6 О 10
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"?-2 to the second-order divided resonance frequency equation (peripheral free disk), 1.76 ? f =
? ? и и и и и (2) a2) When substituted, it becomes 's'; 370Q (z). As described above, a reproduction
band as wide as about twice that of the conventional paper cone can be obtained, but on the
other hand, the voice coil and the magnetic circuits r and J become large as apparent from FIG. 3
(a). , And other expensive prices, days?
Disturbances in the characteristics due to the difference in Western pressure distribution inside
and outside the dog coil, and disturbances in the back pressure of the diaphragm due to the
magnetic circuit, etc. have been found. Still, there was an accident such as coil touch, resulting in
deformation due to the large size of the voice coil. Furthermore, there are drawbacks such as
being difficult to use an ia tool for assembling a vibration system and being inferior in
productivity. The flat loudspeaker shown in FIG. 3 e) solves some of these drawbacks, and the
reference numerals 2 to 6 are the same as those in FIG. Six cones 1 o 48 are provided, and 1 is a
cone-shaped diaphragm connected to a node of axisymmetric divided vibration of the flat plate
type sliding plate 6 and a steering coil. Although there is an advantage that it is possible to use a
magnetic circuit and a voice coil comparable to those of the conventional cone-shaped speaker
with the flat-plate speaker of FIG. 3 (b) configured as described above, There is a disadvantage
that the secondary resonance frequency is lowered by about 20% as compared with one directly
driving a node in order to drive the flat diaphragm via the same. In addition, the assembling
method had the same difficulty as in the case of the speaker of FIG. 3 (a), and in the flat panel
speaker shown in FIG. 3 (e), reference numerals 1 to 5 are shown in FIG. 7 is a foamed material
which fills the front cavity of the cone-shaped diaphragm, and makes the surface flat, in the same
or the same part as that of (b). The flat loudspeaker of FIG. 3 (C) configured as described above
has an advantage over conventional cone loudspeakers in improving the efficiency of the
magnetic circuit that only compensates for the weight of the foam material. However, on the
other hand, because the foam material is embedded in the cone-shaped diaphragm, there is a
decrease in the weight partial pressure and the dog's frequency at the co-shooting frequency
104I), and it is possible to obtain only the same performance as a conventional paper cone
speaker Can not. As described above, the sound pressure-frequency characteristic due to the dent
effect, which was a drawback of the cone-shaped speaker, is bad! Even the conventional flat
loudspeakers for eliminating the problem have the drawbacks such as obliqueness. Therefore, an
object of the present invention is to provide a speaker having flat sound pressure-frequency
characteristics which can not be obtained by the conventional speaker, and further having a wide
reproduction band and an easy assembling method. An object of the present invention is to
provide a loudspeaker as described above by improving a loudspeaker of a system in which the
nodes of the axisymmetric divided vibration of the flat diaphragm shown in (b) are driven by a
cone diaphragm. Hereinafter, the present invention will be described in more detail based on
preferred embodiments. Referring to FIG. 4, a flat loudspeaker according to an embodiment of
the present invention is indicated generally by the numeral 10. In FIG. 4, 11 is a ring-shaped
three-layer honeycomb structure diaphragm having a GFRP honeycomb as a skin, phosphorus j, f,
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8?
'1 o 5 ░ -shaped flat plate 12, 12 voice coil, 13 supports an edge supporting lJ song flat plate
11, 14 is connected to voice coil 12, and is connected to ring flat plate 11 and voice coil 12 A
spider 15 has a function to improve, a magnetic circuit portion 15 for driving the voice coil 12,
and an aluminum cone diaphragm 16 whose outer end is connected to the inner diameter
portion of the ring-like flat plate 11, and the ring-like flat plate 11 and its plate A nodal circle of
first-order axisymmetric division vibration of a flat plate diaphragm 19 composed of a GFRPskinned three-layered honeycomb structure inner body plate 18 attached to an inner diameter
side hollow portion and having a flat surface as a whole A cone peristaltic plate provided with a
plurality of openings 20 for driving and eliminating air resonance inside the cone. The flat-plate
speaker according to one embodiment of the present invention configured as described above
has its sound pressure-frequency characteristic A, and that of a cone-shaped bi = force B using a
conventional paper cone; As is apparent from the graph of FIG. 5 showing and comparing the
similar characteristics C of the conventional flat loudspeakers shown in FIG. It can be seen that
the widest reproduction band and flat sound pressure-frequency characteristics can be obtained
because of driving. Moreover, in the embodiment according to the present invention, in order to
drive the nodes of the divided image movement of the flat plate moving plate 19, it is possible to
obtain a reproduction band which is about four times wider than that simply filling the front
cavity of the cone diaphragm. In addition to the conventional cone diaphragm driving the back of
the flat plate moving plate, the characteristics and the sound quality are improved because the
entire node portion of the flat plate vibrating plate is driven, and a voice coil jig is used to make
the diaphragm. Since it can be manufactured, there is an advantage that mass productivity is
greatly improved. As described above, according to the flat type speaker according to the present
invention, the distortion on the sound pressure-frequency characteristics due to the dent effect
which has occurred in the cone shape is used, and the divided vibration node of the flat
diaphragm is made by the die coil. Performance close to that of a directly driven speaker can be
obtained, and the assembling method is simple and has an effect of excellent mass productivity.
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