### JPS61127300

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DESCRIPTION JPS61127300
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
special structure of a sandwich plate suitable for application to a flat diaphragm of a speaker.
[Prior Art] There is a flat type diaphragm used for a speaker as shown in FIG. To briefly explain
this, (1) is a honeycomb core, and (2) and (3) are skin materials stuck on both sides thereof. The
core (1) is composed of a plurality of long core single pieces (4), and each core single piece is, as
shown enlarged in FIG. 4, each piece a, b, a, d, @, ... are sequentially bent at an angle of 120 'to
each other, and longitudinally extending pieces (C' + @ tK in the example of the figure) of these
core single pieces (4) are adjacent to each other. It is adhered to each of the vertical direction
pieces of (4). Each core single piece (4) is generally formed of aluminum foil, and its thickness is
selected to be about 10 μm to be reduced in weight, thereby avoiding a decrease in sensitivity.
The thickness of the skin materials (2) and (3) is about 40 μm. [Problems to be Solved by the
Invention] In such a core (1), as the core (1), the above-mentioned longitudinal direction (referred
to as Y direction) and transverse direction (referred to as X direction) The bending stiffness is
different from each other. That is, the minimum element of the core (1) in this configuration is a
portion surrounded by a dotted line (5) K in FIG. The lengths of the respective pieces a, b, a, d,...
Of the core single piece (4) are formed to be equal to each other. When the length of the
minimum element (5) in the X direction is 4A, the length in the Y direction is three. On the other
hand, the sum of the components in the X direction of the core (1) in this nilemene (5) is 2 / TA,
and the sum of the components in the Y direction is six. These relationships are shown in the
column of the conventional product in FIG. As apparent from this table, the length of each
direction of the element (5) and the sum of each direction component of the core (1) are in direct
proportion. In this configuration, the components in the Y direction are arranged at intervals of
nh with respect to the X direction, and the components in the X direction are arranged at
intervals of 3 A with respect to the Y direction. The intensity ratio to is 汀: 1. The above-
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mentioned values are calculated by considering only the core (1), and in practice the skin
materials (2) and (3) exist on both sides of the core (1), so the ratio is small and large In contrast,
when the thickness of the skin materials (2) and (3) is 40 μm or more, it is not a problem at all.
However, if the thickness of the skin materials (2) and (3) is selected to be 20 μm or less in
order to reduce the weight of the diaphragm, the above-mentioned intensity ratio in the X
direction and the Y direction becomes large. By the way, in the case of a flat planar speaker of
square shape, it is considered to drive by eliminating the contraction mode of the divided
vibration in the X direction and the Y direction. KyAl, and similar stiffness to bending are
required, but the thin skin material causes problems as described above. [Means for Solving the
Problems] In the present invention, the core (1) of the present invention has a square shape as
shown in FIG. The [Operation] If the diaphragm according to the present invention is used, the
rigidity against bending in the X and Y directions is 1: 1, so that the contraction mode is driven
as described above. When applied to a diaphragm, it is possible to obtain a more suitable
speaker. [Embodiment] An example of a diaphragm according to the present invention will be
described with reference to FIGS. 1 and 2. FIG. The same reference numerals as in FIGS. 3 and 4
denote the same parts in FIG. In the present invention, with respect to each core single piece (4),
as shown in FIG. 2, the respective pieces a, b, a, d, @,. For example, it is bent in a zigzag so as to
extend in the Y direction) and the other direction (for example, the X direction) orthogonal
thereto, and pieces extending in the Y direction of these core single pieces (4) are adjacent to
each other Bonded together. The core single piece (4) in this case can also be formed of a socalled aluminum foil having a thickness of about 10 μm. According to this configuration, the
minimum element (5) constituting this core (1) is in the range surrounded by the dotted line (5)
in FIG. 2, and each piece "# btcFd # ... ... When the length of each of the elements (5) is A, the
length in the X direction of this element (5) is two people, and the length in the Y direction is also
a story. In addition, the sum of the components of the core (1) in the X direction in this element
(5) is 4A, and the sum of the components in the Y direction is also four. These relationships are
shown in FIG. 5 in the column of the present invention. In this configuration, the components in
the Y direction are arranged at intervals of two persons in the X direction, and the components in
the X direction are similarly arranged at intervals of K 2A in the Y direction. Thus, in the case of
the core according to the invention, the strength ratio for bending in the X direction to the Y
direction is 1: 1. That is, according to the sandwich plate according to the present invention, the
bending in the X direction and the Y direction has equal stiffness.
Also in the directions indicated by the alternate long and short dash lines P and Q in FIG. 2, that
is, the directions with 45 ° inclination with the X or Y directions, these are so-called point
symmetry, so Rustiness becomes equal to each other. According to the present invention
described above, even if the skin materials (2) and (3) are formed thin, their rusting resistance to
bending can be made equal to each other in the X and Y directions. Therefore, it is possible to
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make the divided vibration frequencies coincide with each other strictly in the X direction and
the Y direction, and when this is used as a diaphragm of a speaker, it has a feature that can
produce a better speaker. is there.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partially cutaway perspective view showing an example of a sand-inch plate according
to the present invention, FIG. 2 is an enlarged view of a portion of its core, and FIG. 3 is a
cutaway portion of a conventional sandwich plate FIG. 4 is a perspective view, FIG. 4 is an
enlarged view of a part of the core, and FIG. 5 is a table showing the characteristics of the
sandwich plate.
(1) is a hump, (2), (3) is a skin material, (4) is a core single piece 5 heb, a, d,.
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