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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 shows an embodiment in which the present
invention is applied to a headphone, FIG. 1 is a perspective view showing the conversion part of
the headphone vertically at the center, and FIG. FIG. 3 is a plan view showing a state in which a
certain protective film is attached, and FIG. 3 is a characteristic diagram showing the relationship
between frequency and output when the protective film is provided. Further, in the reference
numerals used in the drawings, reference numeral 1 denotes an entrance diaphragm, 3 and 4
denote fixed electrodes, 7 and 8 denote protective films, and 9 and 10 denote openings. Fig. 1
Fig. 2-85-Japanese Utility Model No. 50-60033 (2) Fig. 3 n 3 K 厭 (} lx)-86
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an open board
electretton sensor. Head phones, microphones, speakers and the like are already known as
condensers. The basic structure of this type of transducer spreads a thin film as a moving film on
the center plane of the gap between two perforated electrodes, and forms a conductive coating
with metal plating or a good conductive paint on the surface of the film. The imaging film is
photographed by a voltage to convert an electric signal to an acoustic signal, or the diaphragm is
vibrated by an acoustic signal from the outside to convert an acoustic signal to an electric signal.
In the capacitor type transformer as described above, it is possible to replace the imaging film
with an electret, ie, a semipermanently poled dielectric, and in this way it is possible to omit the
polarized power supply. is there. However, the electret phenomenon is still unclear, and the
stored charge may be attenuated due to various external conditions, and (2) the conversion
efficiency may decrease with time. The cause of the deterioration and decay of the stored charge
is not only due to the suitability of the material itself, but it is also found that the influence of the
low F of the electrical conductivity of the material is the largest. As the electrical conductivity of
the polymer drops exponentially with increasing temperature, it rapidly decays above its critical
temperature. The critical temperature varies significantly depending on the material, but there is
almost no problem in the range of normal temperature. In addition, it has been found that the
decrease due to moisture and ion particles in the atmosphere can not be overlooked, and
furthermore, the temperature, humidity and ion particles in the atmosphere as described above
are greatly influenced by the use environment. For example, in the case of two head pongs, it has
been found that the unit comes in close contact with the ear holes of 111 is and is exposed to
steam such as hair setting and perspiration to accelerate deterioration. (3) It can be seen that in
order to solve the problems as described above, it is sufficient to disconnect the electret from the
atmosphere substantially without exposing it to the atmosphere. However, it is desirable to
construct the transducer in an acoustically open type, and simply by using a protective film as
open air and only one cut, transmission loss and distortion may occur at the entrance of the
sound wave, and good results can not always be obtained. . The present invention has been made
in view of the above-mentioned points, and it is an object of the present invention to provide a
high-fidelity conversion scale and deterioration-prevented 9 transformer despite its simplified
structure. It is That is, in the present invention, a pair of fixed electric (4) electrodes, for example,
a metal fixed electrode conversion portion having an aperture ratio of 50 to 80%, is disposed on
both sides of an electretary made of polytetrafluoroethylene resin etc. Provided with at least one,
the acoustic signal transmission openings on both sides of the conversion unit are subjected to a
kneading treatment, and preferably a thickness of about 5 μm or less, preferably 2 to 5 μm,
more preferably about 0 to 1 mm. The present invention relates to an open electret transducer
which is sealed with a 5.5 μ thick soft polymer thin film to substantially seal the working
By configuring the transducer as described above, it is possible to stop the degradation t ′ ′ of
the electret and to convert the acoustic signal that is converted with high fidelity based on the
electret non-working film and converted, or the acoustic signal to be converted. Signals can be
transmitted with high fidelity with extremely small transmission loss. Next, an embodiment of the
present invention will be described with reference to the drawings. FIG. 1 is a longitudinal
sectional view schematically showing a headphone to which the present invention is applied. In
FIG. 6, il + is an electret vibrating film having a thickness of 6 μ, and electretizes a thin film of
ethylene hexafluoride to have an effective diameter of 50 mm. It is a monoball electret of a
positive electrode expanded in a metal frame (2) so as to have a circular shape of about 500 H2.
13) and (4) are fixed electrodes of a circular porous metal plate having an opening (6) having an
opening ratio of about 64 憾. This respective fixed electrode 131! 41はエレクトレ。 Electre
having substantially the same diameter as the moving film 11). It is brazed in parallel with the
electret vibrating membrane (1) by a ring-shaped insulating holding frame (8) so that a gap of
0.25 mm is produced between the vibrating membrane 11i and the vibrating membrane 11i. As
described above, in the conversion section formed by the electret diaphragm il + and the pair of
fixed electrodes (6) + 31 + 41, if the signal effective voltage 100v is applied to the fixed
electrodes (3) and (4), the artificial ear of 2.5 cc ( A force, a sound pressure of about 100 dB SPL,
is generated in the puller 9, and an almost flat acoustic characteristic is obtained over the range
of 20H2 to 15 KH2. (7) and (8) are protective films made of polymer thin films that close the
acoustic signal transmission opening (9) on the left side of the fixed electrode (3) and the
acoustic signal transmission opening 51101 on the right side of the fixed electrode (4) It is. The
protective films (7) and (8) are made by rubbing a polyethylene film having a thickness of about
3.5 μm so that the entire view KO, 1 to 0.3 mm of 皺 1 11) is uniformly printed, and this is
taken together An adhesive was used to loosen the metal ring mousse so that the frequency was
about 100 H 2 and stretched so as to leave wrinkles, and this was placed on an insulating
holding frame + 61 by 9 ・ · r. As shown in FIG. 1, the conversion part configured as shown in (1)
is attached to a case having openings on both sides, and a baffle and an ear rest are provided on
the side to be in contact with the ear, and the fixed electrode (3) 14) A curve tbl in FIG. 43 is
obtained by determining the relationship between the frequency and the output of the
headphones constructed as described above, such that the signal voltage is applied to the first
child Q4 to complete the second sound. 伺 Fig. 14-In curve 1, a) shows the characteristics
without the protective film and 9 cases, and with the curve (C1 is a polymer film of 5μm, 9 films
are made with protective films. The characteristic is shown, the curve td) shows the
characteristics of the case where the 7 jfc is used as the protective film and the polymer film of
6.6 μ is used as the protective film, and the polymeric film with the curve tel Ir112 is made as
the protective film. Indicates the characteristics of the case.
This characteristic is almost the same even if the material of the pot molecular film is changed to
polyester, polypropylene, ethylene fluoride or the like (8), as can be understood from this
characteristic curve. There was almost no difference from the one without the protective film,
and the characteristics were extremely good. Also, as a result of the experiment, it was found that
the film having a thickness of about 5μ of the curve tc + can be used with no significant loss due
to the entire zone. When 閘 5 μ or more, it is found that the loss increases in the entire band as
well as the loss in the high region in particular, and it is practically unusable for acoustic
equipment. In addition, since it is almost impossible to form a polymer thin film having a
thickness of 6.1 μm or less and no hole by the current industrial principle technology, the
thickness should be approximately 6.5 μm from the balance of pinholes etc. at present. Was
found to be the most ideal. Also, since the dophone is closed by the outer periphery of the
electret a moving film (1) or the ring-shaped holding frame (6) and both sides are closed by
[protective film + 71 + 81 without pinholes, It is in a state close to sealing, and perspiration and
hair styling agent vapor, ion particles in the air, moisture etc. (due to very little deterioration of
the electret, therefore stable operation over a long period of time) Nine. At the same time, the
Dohon 2-became lighter, and the feeling of use was improved. Moreover, since both sides of the
conversion part by a circular electret imaging film il + are open | released and it is comprised so
that an ear may be put on one surface of a photography movement direction, it became nine
headphones of the outstanding sound effect. Although the embodiment of the present invention
has been described above, the present invention can be further modified without being limited to
this embodiment. For example, it is possible to stack conversion units which are accommodated
from the electret film and the fixed electrode, and to provide the multi-channel headphone 101
with the same protective film as that of the embodiment at the signal transmission opening. In
addition, 4 can be applied to a speaker, a microphone, and the like.
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