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JPS5472032

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DESCRIPTION JPS5472032
2 · Specification · 1, the name of the invention
Diaphragm
3. Detailed Description of the Invention The present invention relates to a diaphragm for use in
an electroacoustic transducer such as a speaker, in which the speed of the diaphragm is
increased and the bending rigidity thereof is also increased. Conventionally, paper, metal or the
like has been used as a material of the diaphragm for the electroacoustic transducer. Although
there are few examples of diaphragms using these that have both high sound velocity (speed by
sound) and high bending stiffness, efforts have been made to increase the sound velocity and
increase the bending stiffness. A well-known example is a cone-shaped diaphragm provided with
corrugation on paper, but also in this case, there is also a diaphragm using a 0 or metal
laminated plate, in which the paper does not have a sufficiently high sound velocity. In this case,
the weight of the diaphragm increases. On the other hand, the bending rigidity is not so high
when the foamed plastic is used as the core material. Although there is also an example in which
a honeycomb having a cell shape as shown in FIG. 3 is used as a core material of a laminate,
there is no reinforcing pattern because the pattern of the honeycomb does not suppress bending
vibration of the axisymmetric diaphragm. not enough. As mentioned above, in the conventional
structure, an axisymmetric diaphragm having a large sound velocity and a large bending stiffness
can not be realized. The present invention provides a diaphragm adapted to solve such
conventional problems.
Diaphragm
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Prior to the detailed description of the present invention, first, a cone-shaped diaphragm used in
a dynamic cone speaker will be described as an example of a conventional axisymmetric
diaphragm for an electroacoustic transducer. It is well known that a cone-shaped diaphragm
causes complicated division vibration when it is vibrated at a high frequency, which causes
deterioration of the characteristics of the speaker. There are two causes of this EndPage: 1M
division vibration. One is the stretching vibration of the cone and the accompanying bending
vibration, and the other is a simple bending vibration. The important thing here is that bending
vibration of the cone occurs as a result regardless of the cause. Therefore, it is a necessary
condition that the cone-shaped diaphragm has a high sound velocity, but it is desirable that the
cone-shaped diaphragm have a large bending rigidity. This is one of the reasons why 厭 has been
used as a cone diaphragm in the past. That is, while the paper has a relatively high sound velocity
(1000 to 3000 m, / S) e, the specific gravity is as low as 0.3 to 0.6, so the diaphragm has a
smaller weight than other materials when the weight of the cone is constant. This is because the
thickness can be increased and the bending properties can be increased. In order to further
increase the rigidity, there is also a case in which a so-called corrugation is provided. For the
reasons as described above, a large amount of paper has been used as a cone-shaped diaphragm,
but in recent years the vibration of the cone-shaped diaphragm integrally moving (hereinafter
referred to as piston movement). In order to widen the frequency range of-), it has come to be
able to sound velocity larger than paper. Since these materials are difficult to use singly as in
paper because of their large specific gravity, they are often used as the surface material of
sandwich cones using foamed plastic and honeycomb as described above. However, the
reinforcement effect is not sufficient with these methods. The diaphragm according to the
present invention can solve the problems relating to the weight, the reinforcing effect, and the
piston movement area as described above at once. That is, according to the present invention,
metal or plastic, which is a material having a large sound velocity, is used as a counter, and a
structure in which these materials are used to increase non-bending rigidity is used. First, let's
consider what kind of structure can be used to maximize bending stiffness. An example of the
mode of bending vibration of the cone-shaped diaphragm is shown in FIGS. 1 (a) and 1 (b). FIG. 1
(a) shows an example of bending vibration having nodes 2 in the radial direction of the
diaphragm 1, and FIG. 1 (b) shows an example of bending vibration having nodes 2 in the
circumferential direction. In addition to this, in the case of a cone-shaped diaphragm, bending
vibration having a mode as shown in FIGS. 1 (a) and 1 (b) is also generated.
From the above, an effective reinforcement method for suppressing the bending vibration of the
cone-shaped diaphragm becomes clear. That is, in order to suppress bending vibration having the
nodes 2 in the radial direction shown in FIG. 1 (a), the projections 3 provided in the
circumferential direction of the cone as shown in FIG. 2 are effective. In order to suppress the
bending vibration having the nodes 2 in the circumferential direction shown in FIG. 2B, the
projections 4 provided in the radial direction of the cone as shown in FIG. 2 are effective. Also
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from this fact, the difference between the No-Nycomm structure and the present invention is
obvious. The 1 カ ム ノ cam structure can not sufficiently suppress bending vibration when it is
used for an axisymmetric diaphragm due to the restriction on the cell shape as shown in FIG. 3 as
an example. The bending stiffness increases as the thickness of the plate 1 increases and as the
number of the projections 3 and 4 increases. As described above, the present invention is
characterized in that projections are provided in the circumferential direction and in the radial
direction on a diaphragm made of metal or plastic having a high sound velocity to obtain a high
sound velocity and a large bending stiffness. The effect of the present invention can be obtained
for one in which approximately half of the volume of the diaphragm, that is, 60 inches or more is
made of metal or plastic. In addition, as a method of manufacturing the projection, etching can be
performed on a metal diaphragm, and integral molding can be performed on a plastic 0 Of
course, bonding is performed after the diaphragm and the projection are separately
manufactured. It may be easily imagined that the same vibration mode will always occur if it is an
axisymmetric diaphragm as well as the zero-cone diaphragm which may be used. Therefore, it is
obvious that the reinforcement by the circumferential and radial protrusions as described above
is effective in suppressing bending vibration. As described above, according to the present
invention, it is possible to provide a diaphragm capable of performing piston movement in a wide
band.
4. Brief description of the drawings Fig. 1 (勺, ((is a plan view showing the mode of bending
vibration of a cone-shaped diaphragm, Fig. 2 is a perspective view showing an embodiment of the
present invention, Fig. 3 is a honeycomb Is an EndPage: 2 'diagram showing the cell shape of. 1 · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · projections. Name of agent Attorney Nakao Toshio and others
1 person Figure 1 Figure 2! EndPage: 3
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