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DESCRIPTION JPS54177919

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DESCRIPTION JPS54177919
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows the principle of the present invention. 1 ...
substrate, 2 ... spring, M ... ... mass. FIG. 2 is a graph showing the characteristics of FIG. 3 a and 3
b are a plan view and a side view showing an embodiment of the present invention. 3 ...
microphone, 4 ... microphone support.
The present invention relates to a microphone support, and more particularly to a microphone
support incorporated in a small tape recorder. The objective company of the present invention is
to provide a microphone 1 - j ζ zho, y 'ti "' y 7 support which is compact, simple in structure and
completely obstructs unnecessary external vibration. For a microphone support of a device
incorporating a motor or the like which becomes an unnecessary noise shooting source like a
tape recorder, a mechanism for blocking the vibration is necessary. Particularly, as noise
shooting becomes relatively large as the size of the device is reduced, a supporter that is compact
and completely shut off the shooting is necessary. More recently, since the sensitivity of the
microphone is improved, a more effective support is necessary. The unnecessary movement
(noise) entering the microphone is caused by the noise that the noise emitted to the air of the
shooting source such as the motor or the gear propagates through the air and the chassis with
the shooting source are shaking 11! It is transmitted to the microphone and it can roughly be
divided into noise caused by the vibration generated by the microphone being vibrated. When
comparing the magnitudes of the noise of these two, the latter shot is much larger than the
shoot! If you miss the +, the noise Ii entering the microphone rarely happens. As a conventional
microphone support, there are many structures using rubber, rubber has large internal rubbing,
and it is suitable as a material for a support because of small elasticity 2-: car. However, it is
difficult to miniaturize from the viewpoint of material and manufacturing, and if it is made
compact, it will not fully demonstrate the function as rooting. The present invention is
characterized in that this drawback is eliminated and a support is formed by using a gold part
elastic material fee which can be easily made into a small shape from the viewpoint of
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manufacturing. Figures 1 and 2 explain the principle of the present invention. 1 is a substrate
having a relatively large amount of i. 2 has a quality 1M at its tip, a spring with a spring constant
K and a viscosity coefficient C, and the other end is fixed to the substrate 1 to form a cantilevered
burr type vibration system. When the displacement of the substrate 1 varies in the x direction as
shown in the figure X = Xom ωt [xI is the maximum displacement, ω is the natural circle
frequency], the displacement Yt of the mass revolution is obtained, y = Y6ydm (ω is 1 α- δ) (41
/ (K - lid) 1 α = - a ω / X, where δ is the total number of particles in the sample. Here, B = o /
m, FI = zlTi'r, L = ω / -1 ω, = i 2 i? (2BL) / 1C1-L) + (2BL) when we consider the relationship
between the substrate 1 and the maximum displacement of the material + & M, A = Y · / X.
If the spring is metal, the viscosity coefficient C is very small (C kg) A = 1 / I (1 - L 1. This is
shown in the graph of Figure 2. The abscissa indicates A on L1 ordinate. From the graph, for
example, when L = 3, that is, when the vibration axis number of the vibration system is a row of
the vibration frequency of the substrate, the displacement of the mass is 14 of the displacement
of the substrate, and is not displaced to a great extent. In other words, vibration of the board is
hardly transmitted to the mass. If L is made larger, A is further reduced and vibration is not
transmitted. Therefore, in the tape recorder, for example, if the substrate 1 is a chassis for fixedly
supporting the gear of the motor or the transmission mechanism and the mass M is a
microphone, the spring 2 ft microphone support body, and the vibration frequency of the
vibration system is appropriately decided, Unnecessary noise vibration is not transmitted to the
microphone. If the vibration frequency of the vibration system is lowered, it becomes more
difficult to be j - · - -, but if it is too low, the spring becomes weak and the microphone vibrates
easily due to disturbance or the like. Therefore, the number of shots is determined to be as large
as possible from the frequency of noise vibration and its magnitude and the minimum feeling fK
of the microphone. Here, for example, if the vibration frequency f 50 HM of the vibration system
and the weight df CL 561 of the microphone are used, if the support is made of metal, the
thickness [112111, width 1 ms. It can be downsized to about 19 m in length. If the thickness τ
τ is made thinner, the length can be shortened, and further miniaturization is possible. When
actually installing the cough support in a small device, it is still too large for the above-mentioned
cantilever Paris shape, and the shooting mode of noise roots is shown in Fig. 1, not only the
transverse wave in the next direction, A transverse wave in the direction, a spring, a longitudinal
wave in the longitudinal direction also occurs, and in the cough shape all the noise oscillation can
not be blocked. FIGS. 3 (a) and 3 (b) show a plan view and a side view of a microphone support
for blocking all of them according to one embodiment of the present invention. 5 is a
microphone, metallic thin 5-4 ·. 1.2! The plate is coupled to the center end of the
microphone support 4 formed in a spiral shape as shown in the figure. The vibration system of a
single-shot frequency is constituted by the mass of the microphone 3 and the spring property of
the support 4. Reference numeral 5 denotes an attachment portion for attaching the microphone
support to a chassis, a case or the like (not shown), and is connected to the outer peripheral end
of the microphone support 4. In this embodiment, the mounting portion 5 is formed integrally
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with the support 4, but it may be formed separately. In this way, by forming the spiral shape of
the support metal gold metal type, it has a sufficient spring length and it fits in a small size.
Furthermore, since it is a spiral shape, it is possible to have springiness in every direction by
appropriately designing the spring, and noise vibration in all directions can be blocked. In this
case, although the number of kimonos in all directions may be the same, it is possible to easily
make the whole support by changing the frequency according to the mounting direction of the
microphone and the support according to the size of the transverse wave and the longitudinal
wave of the noise vibration. That is, in the figure, in (a) of Figure 3, 'S number of workers' is more
likely to be higher in the direction perpendicular to the paper surface than in the parallel
direction. In this embodiment, the spring is formed of a thin plate. However, since the
microphone is easy to attach, the thin rod may be formed into a spiral shape. As described above,
according to the present invention, by forming a thin plate or thin rod as a spiral spring and
forming a microphone support, it is possible to use a metallic material in a very small size,
furthermore it is possible to further reduce the noise vibration to a size It is blocked. The present
invention has a high practical effect for application to tape recorders, particularly micro micro
cassette recorders.
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