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JPS5626495

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DESCRIPTION JPS5626495
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are front elevational and sectional
views of the main part of a honeycomb diaphragm, and FIG. 3 is a front elevation showing an
embodiment of the present invention. 4 · · · · · diaphragm, 5, 7, · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· voice coil bobbin.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a speaker using a
diaphragm made of an anisotropic material, and in a simple configuration, the node of the
eigenmode of the diaphragm is made circular, and this node is driven by a circular voice coil
bobbin. It is Conventionally, when constructing a speaker having a flat diaphragm, it has been
practiced to use a honeycomb diaphragm as shown in FIG. This is obtained by covering both the
front and back sides of the honeycomb core 1 with a large number of honeycomb-like cells 1a
with surface materials 2 and 3. ヘ−$KtO:Lうヶ2、=ヵA! Due to the shape of the cell
1a of the t # [U, 2, 6-6 'core 1, the rigidity in the lateral direction (X direction x 2 direction) and
the rigidity in the longitudinal direction (Y direction) are mutually different. Because they are
different, in the case of a circular diaphragm, the nodes or eigenmodes of the eigenmode do not
become round, but they become elliptical. In the speaker, it is known that driving a node of the
eigenmode of the diaphragm eliminates the eigenmode having the node and enables good
reproduction, so that the voice coil bobbin is usually coupled to the node position. It is done.
Therefore, in order to drive an anisotropic diaphragm such as a honeycomb diaphragm, it is
necessary to make the voice coil bobbins elliptical in accordance with the nodes. However, there
are various difficulties in using an oval voice coil bobbin. For example, in order to make the voice
coil bobbin elliptical, the voice coil must also be elliptically wound, but when the voice coil is
removed from the winding machine, deformation due to the tension stored inside the coil occurs,
and the intention is There are problems such as being unable to finish in an elliptical shape. The
present invention solves such conventional problems, and a circular bar1. It is an object of the
present invention to provide a speaker in which the nodes of the anisotropic diaphragm can be
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driven 3 by the voice coil bobbin of + '. An embodiment of the present invention will be described
below with reference to FIG. In FIG. 3, the reference numeral 4 in FIGS. 1 and 2... Is the nycam
diaphragm, and since it is anisotropic, the node 5 of the -next eigenmode works in an elliptical
shape. Therefore, attach weights 6 and 6 such as gum tape and aluminum at two points on the
long diameter of the node 6, and change the diaphragm 40 node 5 effectively into a circular node
7 by the mass of this weight 6 ° 6. , Here, a round voice coil bobbin 8 is connected. Of course,
with regard to the mass and position of the weight 6, an optimal one may be selected according
to the individual diaphragm. As described above, according to the present invention, the weight
of the anisotropic diaphragm is added to make the nodes of the eigenmode substantially circular,
and the circular voice coil bobbin is coupled to this node and driven. The nodes of the anisotropic
diaphragm can be changed into a circular shape with a simple configuration, and the diaphragm
can be driven by a very common circular voice coil.
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