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JPS6248898

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DESCRIPTION JPS6248898
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
speaker particularly suitable for use as a high frequency speaker. According to the present
invention, particularly in a speaker suitable for use in a high-frequency speaker, a square asperity
is formed at the center of the diaphragm to give rigidity, and a node of a divided vibration caused
by the asperity is formed. By driving the circle, the sensitivity is high and good frequency
characteristics can be obtained. 2. Description of the Related Art The shape of the diaphragm of a
conventional speaker is a cone or dome. However, in a speaker having a diaphragm of such a
shape, acoustic resonance occurs due to the shape, and disturbance occurs in frequency
characteristics. Therefore, there has been proposed a flat plate speaker capable of obtaining good
frequency characteristics over a wide band by driving a node of divided vibration generated in
the vibrating plate using a square flat vibrating plate as the vibrating plate. By the way, in the
speaker using a flat diaphragm, what has very high rigidity as a diaphragm is requested |
required. It is difficult to configure such a high-rigidity diaphragm with a single-plate diaphragm.
In other words, the resonance frequency fnm of the flat diaphragm in the case where the flat
diaphragm is constituted by one plate is shown as follows. D: bending stiffness, E: Young's
modulus, h: plate thickness, Si: Poisson's ratio, a: one side of the diaphragm square, ?: surface
density = ? h, ?: density, ? nm: determined by the shape boundary condition mode order of the
diaphragm As shown in the river wave number parameter (1), in order to increase the resonance
frequency fnm, it is necessary to increase the bending rigidity and to reduce the surface density
? ?. In order to increase the bending rigidity, it is necessary to increase the Young's modulus E
and the plate thickness as shown in the equation (2). Therefore, in the conventional flat panel
speaker, as shown in FIG. 18, a honeycomb sandwich structure in which the skin material 31.32
is laminated on both sides of the core material 30 is used as a diaphragm. The diaphragm of this
honeycomb sandwich structure is very high in rigidity as compared with the diaphragm of one
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plate. [Problems to be solved by the invention] However, the diaphragm of honeycomb sand inch
structure is expensive and heavy. For this reason, there is a problem that the sensitivity is not
good particularly when used as a high frequency range speaker. Therefore, an object of the
present invention is to provide a speaker having high sensitivity suitable for use as a high
frequency speaker (in particular, good frequency characteristics and low cost). [Means for
Solving the Problems] According to the present invention, quadrilateral irregularities are formed
at the center of the diaphragm, and the nodes of the divided vibration of the diaphragm produced
by the irregularities of the quadrilateral are driven. It is a speaker to be characterized.
[Operation] When the asperities are formed on the diaphragm, the rigidity of the diaphragm is
enhanced by the shape effect. Therefore, a lightweight diaphragm can be used. When a
rectangular asperity is formed at the center of the diaphragm, nodes of the divided vibration are
formed in a circle. By driving the nodes of the divided vibration, the unnecessary mode can be
eliminated. An embodiment of the present invention will be described below with reference to the
drawings. The rigidity of the diaphragm can be enhanced by shape effects. That is, as shown in
FIG. 2 to FIG. 4, if various asperities are formed in the central portion of the diaphragm 1, the
rigidity of the diaphragm 1 can be increased by its shape effect. FIG. 2 shows a square convex
portion 2 formed at the center of the square diaphragm 1. In FIG. 3, a rhombic convex portion 3
is formed at the center of the square diaphragm 1. In FIG. 4, a circular convex portion 4 is
formed at the center of the square diaphragm l. In addition to the above, it is conceivable to form
irregularities of various shapes on the diaphragm 1. As shown in FIG. 5, the rigidity of the
diaphragm can be increased by forming a square or circular recess 6 at the center of the
diaphragm 1. Further, as shown in FIG. 6, if the outer periphery of the diaphragm 1 is bent and
the ribs 5 are formed on the outer periphery of the diaphragm 1, it is possible to increase the
2i11 property of the diaphragm l. In FIGS. 5 and 6, 7 indicates a voice coil and 8 indicates an
edge. Furthermore, as shown in FIG. 7, if a plurality of ribs 10 extending from the convex portion
9 formed at the central portion of the diaphragm 1 to the outer peripheral portion of the
diaphragm 1 are formed, the ? 111 property of the diaphragm 1 is obtained. Can raise In this
manner, the mode frequency can be improved if the rigidity of the diaphragm can be increased.
Thus, a thin single plate can be used as the diaphragm, and the diaphragm can be reduced in
weight. Further, by driving the nodes of the divided vibration of the diaphragm having such
shape effect, the unnecessary mode can be canceled. The mode that may appear when driven
from the center of the diaphragm as a starting point and in point symmetry with this is shown in
FIGS. 8A-8G in the case of a square homogeneous (homogeneous) flat diaphragm. It is a mode to
show. These modes produce peaks and dips in the frequency response. When the diaphragm is
flat and homogeneous, fI: ll + mode is circular. However, if the diaphragm is given a threedimensional shape in order to increase the rigidity of the diaphragm due to the shape effect, the
nodes of the divided vibration are not necessarily circular due to the shape of the diaphragm, and
the shape of the divided vibration node is It changes in various ways.
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Therefore, in order to investigate the relationship between the shape of the diaphragm and the
shape of the nodes of the divided vibration, the inventor of the present application simulated
diaphragms of various shapes using the finite element method. 9 to 17 show these simulation
models and their results. FIG. 9 shows the element division of the basic model when the shape
effect used in the simulation is not given. FIG. 1O shows the simulation result in the f0 mode
analyzed using this basic model, and FIG. 11 shows the simulation result in the fi13 mode. R at
this time. The frequency of the mode is 623 Hz and the frequency of the f 1311 mode is 1939
Hz. As shown in FIG. 11, the nodes (shown by black dots) in the flff3 ? mode appear in a circle.
FIG. 12 shows element division when a square convex portion is formed at the central portion
used for the simulation. FIG. 13 shows the result of the simulation reaction in the f0 mode
analyzed using this element division, and FIG. 14 shows the result of the simulation in the f1331
mode. F at this time. The frequency of one thousand иии was 666 11 z, and the frequency of the f l:
131 mode was 4515 11 z. As shown in FIG. 14, nodes in the f1331 mode appear in a circle. FIG.
15 shows element division when a circular convex portion is formed at the central portion used
for the simulation. FIG. 16 shows the results of the simulation reaction in f0 mode analyzed using
this element division, and FIG. 17 shows the results of simulation in f 1331 mode. F at this time.
The frequency of the mode was 6671 + z and the frequency of the f 1 ffl mode was 402111 z. As
shown in FIG. 17, the nodes in the fl: 131 mode appear as diamonds. As is apparent from the
simulation results described in L, in order to form a square convex in the center of the
diaphragm, the mode frequency can be determined and the nodes in the f 1111 mode become
circular (see 14), this section can be driven using a voice coil of circular cross section. FIG. 1
shows an embodiment of the present invention. From this simulation result, this embodiment
uses a diaphragm in which a square convex portion is formed at the central portion. In FIG. 1,
reference numeral 11 denotes a cylindrical center pole formed from the center of the plate 14,
12 denotes a ring-shaped magnet, and 13 denotes a ring-shaped top plate.
The magnet 12 is stacked on the plate 14 in which the center pole 11 is formed at the center,
and the top plate 13 is stacked on the magnet 12. The frame 15 is fixed to the plate 13. ????
??????? ?? ???????? ?????????? The plate 14 constitutes a
magnetic circuit. 1G is a square diaphragm. As the diaphragm 16, a lightweight metal plate such
as aluminum or titanium is used. As the diaphragm 16, an organic polymer material such as
polyester film 1 paper may be used. At the central portion of the diaphragm 16, a square convex
portion 21 is formed by press processing. Also, the periphery of the diaphragm 16 is bent to
form a rib 22. The voice coil bobbin 17 in which the voice coil 18 is wound is attached to the
node of the divided vibration of the diaphragm 16 at the same time. In an air gap between the
outer periphery of the center pole 11 and the top plate 13 (an air bearing gear knob is formed 3
'1. The voice coil 18 is inserted into the magnetic gear knob of the lens. The periphery of the
diaphragm 16 is fixed to the f5i1 edge of the frame 15 via the edge 19. A damper 20 is
interposed between the voice coil bobbin 17 and the frame 15. As the diaphragm 16, one in
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which a square convex portion 21 is formed at the center of the diaphragm 16 is used. For this
reason, the rigidity of the diaphragm 16 can be enhanced by the shape effect. In addition, the
formation of the square convex portion 21 causes the nodes of the vibration to be circular.
Unnecessary modes are canceled out by attaching the circular cross section of the poison coil
bobbin 17 to the nodes of the circular divided vibration. Furthermore, ribs 22 are formed around
the diaphragm 16. This rib 22 enhances the rigidity of the diaphragm 6 and prevents the
occurrence of a flicker. According to the present invention, since the asperities are formed on the
diaphragm, the rigidity of the diaphragm can be enhanced. For this reason, high rigidity can be
obtained even if a single plate diaphragm is used without using a honeycomb sandwich
diaphragm, and the high frequency band limit frequency can be increased. As a result, the
diaphragm can be reduced in weight, high sensitivity can be obtained even in the high-frequency
speaker, and cost reduction can be achieved. Further, since the unevenness formed on the
diaphragm is a quadrangle, the nodes of the divided vibration are generated in a circle.
Therefore, a circular voice coil bobbin can be fixed to the node of the divided vibration, and the
node of the divided vibration can be driven.
[0002]
Brief description of the drawings
[0003]
1 is a cross-sectional view of one embodiment of the present invention, FIG. 2 to FIG. 4 are front
views and plan views used to explain the shape effect, and FIGS. 5 and 6 are cross-sectional views
used to explain the shape effect 7 is a plan view used to explain the shape effect, FIG. 8 is a route
diagram showing the generation mode, FIGS. 9 to 17 are route diagrams used to explain the
generation of mode, and FIG. 18 is a conventional speaker It is a perspective view used for
description of the honeycomb sandwich structure used for the diaphragm of (1).
Explanation of the main symbols in the drawings 1.16: Diaphragm, 2, 3, 4.21: convex part
Attorney Attorney Sugiura Tadashi 1-1 Bone 1 Fig. 1 Fig. 3 Rib 0 Drinking j River Diagram Fig. 6
vA Fig. 18 f + 3 Mote bIt-s f33: a-1! 'Figure 8A Figure 8B Figure 8Cf + 5 %% f51-p Figure 8D
Figure 8Ef 1331-7-Lss + also-Figure 8F Figure 8 G Professional current customer 1 9 Figure 10
Figure 11 Figure 13 Figure 14 fo pre-r Figure 16 Figure 17
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