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The present invention relates to a high performance electroacoustic transducer diaphragm
having a laminated structure. In general, in the electroacoustic transducer, in particular, the
diaphragm for a speaker, the entire surface of the diaphragm does not vibrate in the same phase
at high frequencies, and becomes a divided vibration mode in which radial or concentric circles
and these are combined. Because the phase of the sound wave radiated is not completely
uniform, the sound pressure frequency characteristic due to mutual interference causes peaks
and dips to occur, and this is for the purpose of eliminating the two negative effects of "Hearing
with ○" Conventionally, in order to make the frequency at which the divided vibration mode
occurs be higher than the required band, conventionally, the senging factor E of the diaphragm
material is made thicker and the density を is made smaller while the apparent thickness h of the
material is increased. Although increasing the rigidity of the diaphragm is described, sufficient
performance was not obtained with a single material or a mixture. The diaphragm for an
electroacoustic transducer according to the present invention is rigid on one side or both sides of
a substrate 1 made of an alloy containing several% to several tens% of metals such as lithium,
aluminum and zinc in magnesium and magnesium as shown in FIG. Is a diaphragm of a laminated
structure in which a high ceramic material layer is formed. In general, the apparent flexural
modulus Ee and equivalent density 積 層 e of the laminated structural material consisting of the
material (1) and the material (2) shown in FIG. 2 are El-E2, where tl is the thickness of the
material (1) The thickness E of the material (2) is t2 / 2, the flexural modulus E2 of the material
(1) is the flexural modulus ρ1 of the material (2), the density ρ2 of the material (1) is the
density of the material (2) However, in the present invention, the material (2) is a ceramic layer
of high rigidity, and its flexural modulus E2 is extremely larger than the flexural modulus E1 of
the metal which is the material (1). The iso-slip modulus is greater than the flexural modulus of a
single metallic material of equal overall thickness. With regard to equivalent density ee, the
density of the ceramic material is large and slightly thick, but the ratio of large Ee largely
corresponds to the large Ee significantly Ee / .rho.e can increase the divided vibration frequency
to improve the high frequency characteristic. The effects of the diaphragm of the present
invention will be described with reference to the following examples. Example 1: A 100 p thick
magnesium alloy is used as the base material 1, diameter 25) formed into a diaphragm shape,
and then beryllium oxide as a ceramic material is mixed gas of argon and oxygen at a pressure of
5 × 10 6 Torr. It was attached to both surfaces of the substrate 1 by reactive sputtering in a
thickness of 10 #.
The physical properties of the diaphragm of Example 1 are compared with other materials, and
the frequency characteristics of the speaker using the same diaphragm are shown by the solid
line characteristics in FIG. Compared to the dotted line characteristics using a diaphragm made of
a single material of magnesium alloy, the frequency of spikes and F n due to divided vibration
move to high frequencies, and it can be seen also in the increase of physical property values in
Table 1 The improvement effect as a diaphragm of a laminated structure is shown. FIGS. 4 (a),
(b), (c) and (d) show other embodiments, in which the shape to which the ceramic material is to
be attached is radially, concentrically or spirally, respectively. Is a combination of them and is
lightweight without reducing the effect as a laminated structure. That is fruitful. Further, the
ceramic material to be attached is not only the oxide ceramic such as IJ IJium oxide and boron
dioxide described above, but also the nitride ceramic such as boron nitride, titanium nitride and
chromium nitride, and carbides such as boron carbide and titanium carbide. Boride-based
ceramics such as base ceramics, boron boride and titanium boride can also be used, and are each
effective for improving performance. The present invention relates to a lightweight, high-stiffness
diaphragm made of magnesium or magnesium alloy as a base material and to which a ceramic
material is attached on one side or both sides thereof. It is very effective in improving the
Brief description of the drawings
1 is a partial enlarged cross-sectional view of the diaphragm of the present invention, FIG. 2 is an
explanatory view of the configuration of the diaphragm of the present invention, FIG. 3 is a
frequency characteristic diagram of the first embodiment, and FIG. FIG.
1 is a substrate and 2.2 'is a ceramic layer. File times
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