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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a longitudinal sectional view of a speaker
according to the present invention, wherein 1 is a diaphragm, 2 is a center pole, 3 is a plate, 4 is
a yoke, 5 is a permanent magnet, 6 is a voice coil, 7 is a voice coil. It is a support spring.
[Detailed description of the invention] This invention relates to the improvement of high-pitched
speakers-The #R moving plate used for ordinary speakers is 0 paper as cone paper or organic
matter such as Bakelite or gold plate etc. In the example, it is tightly formed and is not
particularly breathable. When these vibrations ms are configured as speakers and sounded, the
vibration frequency is given as a function of the shape of the vibration surface. The difference
between the sound emission impedances causes a difference in Fi in the rolling car that sounds
the sound of low II provisional waves. However, it is not desirable to generate unnecessary low
frequency sound from the high sound + 11 speaker, which is intended to produce only sounds in
the 8 mantissa range. The object of this invention is to use a substance whose air permeability is
biased to the diaphragm of these conventional high-tone speakers, unnecessary low-frequency
components do not cause the vibration surface to be ventilated and only the high-frequency
components are generated. It is intended to eliminate the drawbacks of the conventional ones by
producing A section is a longitudinal sectional view showing an embodiment of a high sound
speaker using a diaphragm according to the invention, in which (1) is a diaphragm, (2) is a center
ball, (3) is a plate, (4 Is a yoke, (5) #i permanent magnet, (6) is a voice coil, and (7) is a support
spring. A feature of this invention is that a diaphragm having air permeability is used. For
example, nickel is used as a material of this diaphragm, and the pores of diameter LL15 to CLs 鳳
鵬 are porous groups 80 to 9B-. And a sponge-like metal foam formed so as to have each hole in
a continuous state. In the figure, the structure and material of other parts are the same as
conventional ones. (7) Next, the operation at the time of high frequency and low frequency
oscillation when this diaphragm is used will be described. Now, assuming that the diaphragm has
moved at a displacement amplitude A1 frequency f, the displacement I is given by 1m aLII2 / l
(1) where t is time. Accordingly, it can be understood from the equation (1) that the vibration
velocity V is proportional to the velocity line @ Fi2πIm at this time, V-2g / Atea 211 / J (2). On
the other hand, when there are many holes in the diaphragm and the straws are continuous, it is
possible to ventilate through the holes on the front and the back of the vibrator. The pressure
loss in that case can be divided into loss at the air inlet, loss in the path, and loss at the air outlet,
all of which are relative speeds of air and diaphragm at each location. In proportion to the square
of #V, ΔpzW? It is given λ as (D v p C). Here, ΔPi is the pressure loss of each part y = is the
finger nail of each part, and P is the density of air.
(5) As shown in equation (5), the pressure of the fingertip increases as the relative velocity rises.
In the case of low frequency vibration, the pressure loss is small so that air on and near the
surface of the diaphragm can easily penetrate the diaphragm even if the diaphragm is moving
back and forth. That is, the occurrence of pressure fluctuation components of air from the
surface of the diaphragm, which is a sound, is reduced by this phenomenon. However, this is a
station where the above-mentioned reverse phenomenon occurs for high frequency vibration,
and the pressure loss rapidly increases with the increase in frequency, and the diaphragm moves
back and forth to cause inflow and outflow of this air. It disappears. In the case of high frequency
vibration, the base plate of the present invention exhibits the same operation as the diaphragm
with the conventional dense structure. As described above, according to the present invention as
described above, since it is used as a diaphragm on a material having air permeability so as to
pass only high frequency sound without generating low-speaking sounds, an excellent highsound speaker You can get