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DESCRIPTION JPS4986838

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DESCRIPTION JPS4986838
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 and FIG. 2 are cross-sectional views showing an
embodiment of a support apparatus of the prior art and this invention. 1 ... electroacoustic
transducer 2 ... mounting body 3 ... vibration proof rubber 4 ... rubber 5 ... air gap. Large / 1
figure Z figure 1 91
DETAILED DESCRIPTION OF THE INVENTION The invention relates to a support device for
reducing the losses of the support of an electroacoustic transducer. In this type of conventional
support device, as generally shown in FIG. 1, a solid vibration isolation rubber (8) is interposed
between the electroacoustic transducer +11 and its mounting body 1111, and the elasticity of
the vibration isolation rubber 131 is The electroacoustic transducer (1) is resiliently supported to
minimize braking as much as possible. In this case, the length l of the anti-vibration rubber (3) is
the wavelength λ of the inside of the material which is determined from the relationship
between the vibration frequency f of the electroacoustic transducer ill and the in-material sound
transmission of the anti-vibration rubber (3). (= C /,! +) Against! It is well known that the
influence of the support attachment to the electroacoustic transducer is minimal, and therefore
the loss is minimal, when -λ / 4 / U correction. However, when the above principle is applied to
a low frequency electro-acoustic transducer, the length of the anti-vibration rubber IFi becomes
longer when anti-vibration is supported by the full anti-vibration rubber as shown in FIG. The
practical application is the best because it causes mechanical strength problems with external
conditions such as water pressure. The present invention solves the above problems with a very
simple supporting device, one of which will be described with reference to FIG. Since the value of
Poisson's ratio of rubber is close to 0.5, the speed of straightening of the sound wave that
propagates through the rubber band with a sufficiently large cross-sectional area compared with
the wavelength, and the rubber with a sufficiently small cross-sectional area with respect to the
wavelength It is well known that the propagation speed of the sound waves transmitted through
the cocoon is significantly different, reaching 50 times the difference. This invention utilizes the
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characteristics of the rubber described above, and an anti-vibration rubber +4)-provided with an
appropriate gap (5) inside is interposed between the electroacoustic transducer 111 and its
mounting body 12+. The converter (1) is characterized in that it supports vibration isolation. As
described above, since the electro-acoustic transducer +11 and the mounting body 12 + are
equivalently connected by the rubber having a small cross-sectional area with respect to the
wavelength, the sound transmission speed in the material of the anti-vibration rubber (4) is
reduced. It is possible to satisfy the condition of l = λ / 4 with a rubber having a short length.
Therefore, the loss of the support of the electroacoustic transducer is reduced and the acoustic
conversion efficiency is improved. In this case, the joint area of the anti-vibration rubber 141 and
the converter (1) and the mounting body (2; Even if it is equivalent to the case of FIG. 1, it is
possible to keep the in-material propagation velocity of sound of the vibration-proof rubber 141
small. As described above, according to the present invention, the efficiency of the
electroacoustic transducer can be improved without losing its strength against external
conditions, and the loss of the supporting portion of the transducer can be significantly reduced.
Stabilization of acoustic performance such as transducer co-shooting frequency can be sought.
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