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Poetry request (4 00 00 yen) November 12, 1975 Secretary General of Patent Office 2, founder1 \ 出 出 ¥ "same person 50135630 [phase] Japan Patent Office ■ JP JP 52-601180 release
date Aki 52. (1977) 5.18 Japanese Patent Application Shotoru -z 免 [phase] application date Akio,
(197) /), / z examination request (all four pages) Office internal reference number 7 heart meta
Specification 1, Title of the Invention, '' Transducer Vibration Resistant Phase or Fixed Electrode
H Charge Electr. F, 7. ケイDLQts*ニー、つ2□カ、−ヶ3. 5, the polarization strength of
the electret is such that the distribution of the driving force received by the oscillator is
proportional to 11 or approximately 1 to the standard function of the arbitrary order of one
body. Specified electrostatic transducer with excellent frequency characteristics, characterized by
having a uniform distribution.
2 Claims
In recent years, electrostatic transducers using Elektreno i have come to be used frequently due
to advantages such as 7 hi for bias and no need for a source. In these transducers, it was
intended and manufactured that the polarization strength of the electret is constant at any one of
1 to 1 on the electrode for the reasons described below (-. However, in order to satisfy ice
making, such as flattening of frequency characteristics and improvement of distortion factor
characteristics, the present inventor knew that uniform polarization of the electret actually brings
about disadvantageous results, and this point (two attentions were paid. Let us consider the
reason for the disadvantageous results, taking the circular clamped diaphragm as an example. J
is the driving force Foε with hQ as the standard function of this film.次第-ベ-関 数 ベ 加 え 均一
(加 え 加 え 加 え と き 一種 一種 一種 一種 一種 一種 一種 一種 一種 一種 1 Benocell function
3m · 表 わ J '+1 represented. However, it is assumed by the above formula. That is, assuming that
the electric field of electret-hi is constant, the distance between the electrodes is considered to be
EndPage: 1 even if the distance between the electrodes is small. As clearly understood from this
equation, when the drive frequency ω is increased and the audio frequency band is swept, the
response becomes lesser as the drive frequency approaches the natural frequency (ωI, (, 2,-=)
Increase. That is, no child side frequency characteristic can be obtained. In order to avoid this
defect even in the prior art, a number of 17 different transducers are used to narrow the
acceptance band per unit, or smooth due to mechanical or acoustic damping. Relying on
However, even in this way, it is practically impossible to completely flatten the frequency
characteristics of the second peak and valley, and it was not possible to obtain flat
characteristics. Therefore, as a result of repeated researches by the non-explosive 14 JB, it is
possible to reduce the number of electrets as vibrator materials or fixed electrode materials. By
changing lj smoothly as a function of position on the membrane and making the driving force
distribution proportional or approximately proportional to the nth standard function of the
peristaltic body, all the drawbacks as described above are overcome I found that I could do it. In
such an electrostatic transducer according to the present invention, it is possible in principle to
realize a single vibration mode at all frequencies, and the smoothing means as described in 1] j
"is completely eliminated. Not only that, it will be possible to realize electro-acoustic conversion
with a high degree of fidelity that could not be obtained until now. In the early days when
production of ELI-Let materials was started, it was difficult to make the state of polarization
uniform throughout the material, ie to make the state of charge distribution uniform.
In addition, since development of electrets and transducers was first aimed at replacing the
conductor electrodes and the bias power supply with electrets, the surface potential becomes
uniform as on the conductor surface even when producing the electret material. As such, and
efforts have been made to obtain one with an electrical charge that is exclusively stable areal
density. From the point of view of the prior art, the inventor of the present invention is totally
different from the prior art because the material itself that should be utilized in the electret
phenomenon is a uniform insulator, so in fact any electret material-L is optional. The point is that
it is possible to create an electrostatic field with a smooth intensity distribution and also to create
facts, and that there is no vibrational displacement in the once set driving force distribution
without causing load redistribution. The present invention was finally completed. Such an
invention according to the present invention is true in view of the level of engagement in the
technical field of Electret '' s city, and further in terms of the level of engagement in the technical
field of the transducer using conductor electrodes. It may be considered as a timely invention.
Hereinafter, embodiments of the present invention will be described in detail with reference to
the attached concave curve. FIG. 1 shows a cross section of an electrostatic transducer according
to the invention. (1) is a fixed failure, (2) is an electret film, and (3) is a holding insulator. FIG. 2
diagrammatically illustrates the charge density given to the electret film of 78 + 1 in FIG. 2 (in
the case of n = i). r is the radial position and Q is the field strength. FIG. 3 shows an enlarged
cross section of the electretno) Ill, 1 of FIG. +11 indicates a conductor, and (2) indicates an
electret material. FIG. 4 shows another embodiment of the present invention (° C.). Electreno) 拐
(2+ is fixed W4) (til + is fixed. The polarization emphasis is similar to that of FIG. (1) indicates the
conductive film t (3) indicates a holding insulator. The electret electrostatic transducer according
to the present invention shown in FIGS. 1 and 4 is actually (compared to the conventional
uniform polarization electret electrostatic transducer in both the electrical test and the trial
listening test). In the present invention, the polarization strength of the electret is proportional to
the polarization strength of the electret, and the distribution of the driving force received by the
vibrator is proportional or similar to the number of disciplines of any order of the vibrator. It is
not difficult for the method to have such a changed distribution. For example, EndPage: 2 can be
used using a polarization device in which the polarization voltage distribution is changed from
the uniform one to the one with the required intensity distribution.
The structure of the polarization electrode is shown in Fig. 5.6 as an example in the case of n = 1,
Fig. 5 shows a device that changes the distance between one electrode F] and l + 21 to give the
required change of electric field strength FIG. 6 illustrates an apparatus for applying a change in
electric field strength by finely dividing the electrode (1) and also dividing the polarization
voltage. In both figures, (3) shows electret material and (24) shows holding insulator
4. Brief description of the drawings. FIG. 1 is an explanatory view showing a cross section of one
embodiment of the electrostatic transducer according to the present invention, and FIG. 2 is a
line showing the charge density distribution of the electret film used in FIG. FIG. 6 is an enlarged
view of a cross section of the electret film used in FIG. 1, and FIG. 5 and FIG. 6 give the electret
material the changed polarization intensity distribution required. It is an explanatory view
showing a manufacturing apparatus for. : Corporate procedure correction letter C method)%
formula% 6, Relationship with person making corrections Case 5 applicant, date of correction
instruction June 6, 1959, C March 6, 5 o'clock shipment) 6, The number of inventions to be
increased by the correction) 7 ° C of correction invention The column of the explanation of the
CM base figure EndPage: 3 Contents of correction C% Application 5O-135630) The description is
corrected as follows. 1, page 7 (the column of the brief description of the drawings), "explanatory
drawing showing the cross section in an enlarged view," line 16 [showing the cross section 1 ''
explanatory drawing, FIG. An illustration showing a cross section of another embodiment of the
dispenser, " 09−EndPage: 4
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