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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a speaker diaphragm
of the present invention. 1 is a low rigidity micro hollow sphere, 2 is an adhesive, 3 is a
diaphragm, 4 is a high rigidity micro hollow sphere.
DETAILED DESCRIPTION OF THE INVENTION The present invention is characterized in that the
radiation efficiency and the frequency characteristics are improved by forming the speaker
diaphragm using minute hollow spheres so as to increase the rigidity toward the center. The
physical properties of the speaker diaphragms are required to be high in rigidity, light in weight,
and have adequate mechanical loss, etc. However, such properties are mutually contradictory. It
is an element and it is extremely difficult to completely fill it. In addition, the diaphragm has
uniform physical properties over the entire surface, and it is advantageous in terms of frequency
characteristics to make the ση light partially different (this physical property is different from
the other in terms of frequency characteristics; (A diaphragm formed so as to increase in
compliance as this approaches L1 basic resonance frequency (fO) of high frequency
characteristics is low (can be obtained, flat frequency characteristics can be obtained by
expanding the piston vibration region, etc. Have. Taking this point into consideration, this
invention uses the hollow hollow spheres to increase rigidity, light weight, appropriate internal
loss, and by arranging the hollow hollow spheres with higher rigidity toward the central part, the
central part It is a diaphragm which is formed so as to have a high degree of rigidity so that the
frequency characteristic is extremely improved, and FIG. 1 will be described in more detail below.
The speaker diaphragm of this invention has relatively low rigidity, for example, organic micro
hollow spheres 1 such as phenol resin and epoxy resin and relatively high rigidity such as glass
and alumina, for example, inorganic micro hollow spheres 4 made of organic or inorganic
material Adhesive 2 (Tole bonded-(formed, further (close to the center of diaphragm 3 at the time
of molding), fine hollow spheres 4 having a rigidity as large as 3) are arranged to obtain rigidity
1 To N! And the rigidity is lowered by arranging the small hollow spheres 1 with small rigidity as
the peripheral Q approaches. The speaker diaphragm of such structure has a very small specific
gravity of the hollow hollow spheres 1 and 4 and an extremely high rigidity due to the shape, so
that a lightweight and high rigidity diaphragm can be obtained. In addition to the effect of the
hollow hollow spheres, the use of the hollow hollow spheres with high rigidity in the area
(thereby the rigidity in the central area is higher and the rigidity is smaller toward the periphery
(the compliance is larger). The impedance matching with the compliance edge is good, and the
basic resonance frequency can be lowered in synergy with the weight reduction, and the
reflection from the edge is extremely small, and the adverse effect on the frequency
characteristics due to the resonance can be suppressed. In addition, adhesive 2 which joins the
spheres (therefore it is possible to have a proper internal loss, so it is possible to suppress the
occurrence of the division vibration and expand the histone interlocking region 4 (this is the
higher In the vibration, only the central portion vibrates to reduce the effective mass, and the
directivity characteristic can be improved.
As described above, the diaphragm of the present invention has features such as light weight,
high rigidity, suitable internal loss, and good intimate matching with the edge portion, and the
diaphragm of the present invention is used. As a result, it is possible to obtain a speaker having a
low radiation efficiency and a low fundamental frequency of 9 fundamental resonance
frequencies, and a frequency characteristic flat to high frequencies.
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