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JPS50115520

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DESCRIPTION JPS50115520
Showa 9 ░ C 20th Patent Office Secretary Saito Hideo и и и ?, the name of the invention
Kanagawa Prefecture Yokohama City Ayako-ku, Shinko Shishi Address, Kanagawa Prefecture
Kanagawa-shi, Kawasaki-Ku, Yuki-ku, Horikawacho 72 Phase [Japanese] Japanese Patent Agency,
Published Patent Publication ? JP-A 50-115520-, F-specification ? 1. Title of the invention 1,
title of the invention
^ ^! V I V V t ? de ?.
8. Detailed description of the invention The present invention relates to a static sound converter.
As shown in FIG. 1 and FIG. 2 as a conventional push-pull electrostatic type electric note number
converter, one is known. That is, in FIG. 51, the DC bias 1 is sandwiched between the electrodes
13 and 1-4 by fixing the both sides of the DC bias 1 through the spacer 12 '; Then, a signal
source is applied to the next side, and both ends of the secondary side of the step-up transformer
15, which performs impedance conversion, are connected corresponding to the fixed electrode
13.14 on the @ -alignment side. Further, between the secondary side middle point of the Takeda
transformer 15 and the diaphragm (movable electrode) 1 is connected a bias power source E via
a resistance ratio. Furthermore, the fixed electrode 13.14 is vibrated by the interaction with the
charge of the different sign given by the protective film made of a film or the like, and is
converted into acoustically good sound, and this n is fixed electrode It is sent to the outside
through the protective films 1-6 and 17 from the holes gh of 13 or 14. In FIG. 2, the one shown
in FIG. 2 is an electret type jL, and both fixed electrodes 13 ? and 14 ? ? have an elastic at
least at the surface and the opposite part to the vibrating & (movable electrode) 11 ? и By
including 1,141 EndPage: 1 list-1, it is characterized in that the power supply circuit for DC bias
can be dispensed with, and other configurations and operation are essentially the same as those
of FIG. It does not change. In the electrostatic type electroacoustic transducer as described above,
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the protective film attached to the outside of both fixed electrodes is moisture proof and
dustproof, and in particular, the electret type shown in FIG. 2 is an electret. In order to maintain
good characteristics of However, in the case where the protective film is attached to the outer
side of the fixed electrode as described above, the structure becomes complicated by only n, and
unnecessary resonance is generated to impair the conversion characteristics. The present
invention has been made in view of the above-described points, and its object is to provide a very
good electrostatic electroacoustic transducer in which the above-mentioned conventional
drawbacks are eliminated. An embodiment of the present invention will now be described in
detail with reference to the drawings. That is, in the third factor, 21.22 are nine fixed electrodes
whose back surfaces are in contact with each other, and the fixed electrodes 21 and 22 are in
contact with each other, and the back electrodes 211 and 221. And the electrets 212 and 222
which are charged to the same polarity. And this fixed electrode 21.22 is sandwiched by a
diaphragm (movable electrode) 25.26 having a conductive layer at least on the back side at a
predetermined distance n with an insulating spacer 23.24. I see.
On the other hand, both ends of the secondary side of the step-up transformer 2-7 to which a
signal source is applied to the next side is connected to the self-oscillating plate (movable
electrode) 25.26. In the bush type electrostatic electroacoustic transducer constructed as
described above, for example, it is assumed that both electrets 212 ░ 222 of the fixed electrode
21. 22 are negatively charged. The back side conductive layer portions of the self-oscillating
plates (movable electrodes) 2 and 2-6 facing n are both in a positive charge state. Here, when an
alternating current signal of the signal source supplied through the secondary side both ends of
the step-up transformer 25 is supplied to both diaphragms 1 ░ and. In the positive half cycle of
the signal, the positive electrode is intensified in the diaphragm (movable electrode) 2 side, and is
attracted in the arrow entering direction-n, and the positive electrode is canceled in the pregnant
moving plate (movable electrode) 26 side. N 'force direction repulsed. Also, in the negative half
cycle of the AC signal, the diaphragm (movable 1! Poles 2 to 5 (11 jl are repelled n in the
direction of arrow B, the fine moving plate (movable electrode, pole) 26 111 J is attracted n in
the direction of arrow B ' The movable electrode 25.26 is also vibrated in the same direction and
converted to n sound. In the present invention as described above, since the fixed electrode
portion including the electret is tightly attached by the self-vibration plate (movable electrode),
the self-vibration plate (the movable electrode also functions as a protective film) become.
Therefore, it is not necessary to specially attach a protective film as in the prior art, and the
structure can be simplified by only that number, and so-called high fidelity can be more faithfully
without compromising unnecessary conversions and compromising conversion characteristics.
Convert and play with effects. According to the present invention, the connection to the fixed
electrode can be eliminated as in the prior art, and the middle point terminal of the step-up
transformer can be eliminated.
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4. Brief description of the drawings. FIG. 1 and FIG. 2 are block diagrams showing the
conventional DC bias type and electret type push-pull type electrostatic electroacoustic
transducer, and the third drawing shows the push-pull type static device of the present invention.
It is a block diagram which shows one Example of an electrical type electric sound tube
converter. 21.22 и и и и Fixed electrode, 211, 221 и и и back electrode, 212, 222 и и и и electret, 23. 24
и и и и и 25. 16 и и и diaphragm (movable electrode), 27 и и и? Step-up transformer. Outgoing agent
Attorney Attorney Takehiko Suzue EndPage: 2 years old 1 figure 2 figures (1) inventor (2) agent
address same place ииии>-1 name (6694) patent attorney Yuki Komiya 2-4 Address same place! ",",
'-21 name (7043) patent attorney General Kawai primary ",', 1.,. Near 1-'i'-Procedure Amendment
2. Es '' * 56 El Patent Office Secretary Hideo Saito 1, display of the case '' N '' '' '/ + ?' patent
application filed on February 20, 1974 (10) related to the patent case (1) 80) Tokyo Shibaura
Electric Co., Ltd. 4, agent ? 105 Telephone 03 (502) 3181 (Large Representative) ('-"6 (" ")" 11
Suzu 1 Takeshi, Hiko, 2-55, Spontaneous correction 7 The details of the correction, as shown in
the attached sheet, are as follows. EndPage: 3149 g и a A day 1. Display of the case Japanese
Patent Application No. 49-20162 2, title of the invention 2, title of the invention electrostatic
type electroacoustic transducer '3, the person who makes correction-related patent applicant
(307) Tokyo Shibaura Electric Co., Ltd. Company 4, agent, 4, co 1, title of invention 1, title of
invention electrostatic electroacoustic transducer
^ ^! V I V V t ? ? ?.
8. Detailed Description of the Invention The present invention relates to the improvement of an
electrostatic electroacoustic transducer, and as a conventional electrostatic degassing acoustic
transducer, as shown in FIG. 1 and FIG. Things and push-pull ones are known. First of all, since
the single type shown in FIG. 1 is provided with a fixed distance 1 and a fixed electrode 1 and a
wJ pole or diaphragm 2 facing each other at a predetermined interval, in principle both
electrodes The signal voltage from the signal source 3 applied to 1 '& Jff acts as all driving force
so that the conversion efficiency is good and the sound pressure can be large. On the other hand,
it strikes a biased power supply (not shown) (Displacement) The following problems occur in the
rounding in which the diaphragm 2 vibrates at a position where it is attracted to the fixed
electrode Ivc due to electrostatic force. That is, since the amplitude at which the actual
diaphragm 2 can be taken becomes narrow, it becomes difficult to use for low to medium sound
with high amplitude and binding, and the wire property over the whole range becomes worse
and distortion increases. Have a factor. On the other hand, the push-pull type shown in FIG. 2
comprises a diaphragm 4 and two fixed electrodes 5 and 6 disposed so as to sandwich the
diaphragm 4 at predetermined intervals on both sides of the diaphragm 4, and Therefore, the
diaphragm 4 is not attracted to the fixed electrode 5 ░ 6 side of the five, and the vibration
position is one vibration. 27-1 U-Nin 9, while the above single type has the advantage of
eliminating defects and obtaining as much as possible treatment, while the signal voltage from
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the signal source 7 between the two fixed electrodes 5.6. As the power becomes strong, the
signal voltage is divided into two to act as a driving force of the diaphragm 2, and the conversion
efficiency is bad, so that the sound pressure can not be increased. The single type and push-pull
type above are not shown, but it is necessary to attach a protective film on the outside for the
purpose of moisture proofing 1 and dustproofing, especially eliminating the need for a bias
power supply. In order to keep the fixed electrode in the electret form, the protective film is
indispensable to maintain the goodness of the electret. However, the construction becomes more
complicated. In any case, there is a disadvantage that the unwanted resonance phenomenon
occurs and the conversion characteristics are impaired. Therefore, the present invention was thus
made in view of the fact that the conventional single type and push-pull type are long and short
with respect to sound pressure, distortion, etc. and require a separate protective film, It is an
object of the present invention to provide an electroacoustic transducer which is extremely
excellent in that both excellent in terms of distortion and distortion etc. and that the protective
film can be dispensed with.
First, the principle of the present invention will be described. EndPage: 4 The electrostatic
electro-acoustic transducer of the present invention is fixed so as to sandwich the fixed electrode
on both sides of the fixed electrode at predetermined intervals. Two movable electrodes
(diaphragm), and it should be called so-called twin single type, so that both movable electrodes
are driven by the signal voltage from the signal source being applied to both movable electrodes.
Therefore, it is different from the above-described conventional single type and push-pull type in
principle or in terms of sound pressure, it is similar to the single type, and the distortion etc. It is
similar to the one of the spur type, eliminating one of the two conventional types and combining
the advantages only. Furthermore, since the fixed electrode is configured to be sandwiched
between the two movable electrodes, the two movable electrodes have the function as a
protective film separately provided in the prior art, and the protective film can be omitted. Here,
what is the so-called twin single type of the conventional single type and push-pull type and the
present invention in terms of the sound pressure and process strain mentioned above? The
sound pressure IPI is generally expressed as follows in this kind of electrostatic quantity
electroacoustic converter-looking at things in contrast. ? и o o-a "c)" E o E + IP + = ? и ? и иииииииииииии
(1) r where ?: angular frequency, 0 0: medium density 1 a: radius of vibration system, 60:
Vacuum dielectric constant, S: area of vibration system, CO: capacitance 1r: distance on front axis
(measurement distance), Eo: polarization voltage, ?: applied AC voltage, ZM ,: effective
mechanical impedance Vibration system, -air load, including negative stiffness) and the constant
term of the above ?) equation ==-"io" ░ 8 ░ 0 ░ '░ 8 ░ 8 ░ ...... when .... represented in base
turmoil r so, when the electrostatic capacitance C in this constant, the diaphragm (movable
electrode) takes a predetermined distance without being attracted to the fixed electrode side by
the polarization (bias) voltage It is applied to the push-pull type so to speak. Therefore, in the
case of the single type and twin single type in which the diaphragm (movable electrode) is
attracted to the fixed electrode side by the polarization (bias) voltage, the capacitance is C. As it
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becomes larger, the constant will also be applied to be greater than K. Further, the effective
mechanical impedance zM casting in the above ? equation changes depending on the angular
frequency so that 2M1 = (M + 2Mm) и ? with respect to the mass M of the diaphragm described
later, but ka (1 (where k = ( From the above equation (1) in the range of cl / Co = 2?f / Co) and
f> fo (where f is the resonance frequency), the sound pressure IPsl, lPpI for the single type, pushpull type and twin single type , LPr, l can be determined as follows.
Here, d: the distance between the vibrating membranes, as described above, is') K as a matter of
course. It suffices to prove that lP81> lPP1 or 1Pyl> 1Ppl. That is, assuming that d is 2 to 8 О 10
? ? ? ? (m), which is usually selected in the above equation (4), it becomes 8 и 2a ? ?) ? и, 2
и oo?d for added mass, and from this, the above equation (8) It can be seen that IPTI> 1 Ppl by
comparing equation (4) with equation (4). For example, a vibrating film having a vibration area of
6 О 10 ? ? (m 2) (specific gravity 1.4. If a thickness of 4 ?) is used, IPTI / 1 Ppl + 1.7 (an
increase of 4.6 dB under the same condition) will be proved as IPT1 + IP81> IPPI, ie IP'f'1> IPpl.
And, in the twin single type of the present invention, the distance d of the vibrating membrane
can be reduced as much as possible in principle, that is, in the twin single type type, the
amplitude is reduced by reducing d. Because even if it makes contact with the fixed electrode, the
other is repelled by that amount, the single type and push-pull type can not contact the fixed
electrode in principle. EndPage: 5-"'J'y,": It is possible to further improve the sound pressure as
compared with the case where it can not be reduced beyond a certain level. As for the distortion
point, the second harmonic distortion is a problem mainly because the driving force has a square
characteristic in this type of electrostatic electroacoustic transducer. First of all, the single type is
subjected to this second harmonic distortion D as in the case of the above sound pressure, for
example, as ka (L, fo (f) (Et + = 160 V, E). In the case of = 100 OV, the distortion factor is 8.8 bits.
When the push-pull type is completely balanced, even harmonics higher than the second
harmonic in principle are canceled, and the distortion is almost zero. However, the twin single
type is completely balanced with the vibration system Ayo (and it can be considered in principle
similar to the push-pull type when the distance between the vibrating membranes is small), and
the distortion is almost zero Take a close value. Next, with reference to the drawings, an
embodiment of the present invention will be described in detail in Japanese Patent Application
Laid-Open No. 511055 20. That is, in FIG. 8, reference numeral 20 denotes a fixed electrode, and
the fixed electrode 20 is a back electrode 211,. Each of the other surfaces 221 (e.g., contact
closely with, for example, electlets 212 and 222 of the same polarity).
The fixed 20 'electrode 20 thus formed is opposed to the insulating spacers 23.24 provided at
both upper and lower ends on both sides thereof at a predetermined interval, and at least at least
the back surface (fixed electrode 20?: both sides of the diaphragm are opposite to each other,
and the diaphragm (positive electrode) having an electroconductive layer on the side) is mounted
on a single 25 ░ 26 plate. On the other hand, both ends of the secondary side of the
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transformers 2 and 7 whose signal sources are connected to the next side are connected to the
two-part moving plates (movable electrodes) 25 and 26, respectively. -In the so-called twin single
electrostatic electroacoustic system of the present invention constructed as described above,
both electrets of fixed electrode 20 parts, for example, both electrets 212 and 222 of negative
electrode charge In the case of the second embodiment, both of the back surface conductive
layer portions of the both moving plates (movable electrodes) 25.26 opposed thereto are in a
state of positive charge. Therefore, in such a state, when the alternating current signal of the
signal source is supplied to the both-parts moving plate (movable electrode) 25 ░ 26 through
both ends of the transformer 27 on the secondary side, the positive half cycle of the alternating
current signal is first At this time, one of the diaphragms (movable 'electrodes) 25 is intensified
in the positive electrode charge and is attracted in the arrow ? direction, and the other
diaphragm (movable electrode) 26 is canceled in the positive electrode charges and repelled in
the arrow (A') direction. Ru. Further, in the negative cow-period of the alternating current signal,
one diaphragm ('15T moving electrode) 25 side is repelled in the arrow (t) direction and the
other diaphragm (movable electrode) 26 side is arrow (B) ') Both parts moving plate (movable
electrode) 25.26 are vibrated in the same direction with the amplitude according to the
magnitude of AC signal so that AC signal It can be converted to sound. 1) Sound pressure
produced by this process, strain by strain etc. Work based on the above principle, Example of
measurement in comparison with the conventional process shown in FIG. 4- Point is close to that
of the conventional single type, eliminating the disadvantages of both of the conventional
methods and combining the advantages only, "makes both sound pressure and distortion, etc.
good. Is possible. Furthermore, since the fixed electrode 20 including the electrets 212 and 222
can be sealed by the two-part moving plate (movable electrode) 25.26, the both-part moving
plate (movable electrode) 2.5.26 functions as a protective film There is no need to add a special
protective film as in the prior art, and the structure can be simplified, and unwanted resonance
phenomena can be prevented without compromising the conversion characteristics. So-called hifi effect.
Above, each distortion curve in FIG. 4 shows the relative distortion measured as taking the same
output level at the frequency 1 ░ KH2 point, and the single formula is 8% or more when added
to the distortion factor. Push-pull type is under lQt, and twin single type is around 2% or less. The
valley sound pressure curve in the same figure also indicates the sound pressure actually
measured as the same humanoid as EndPage: 67 "; 1-9," ", also from the figure that the IPTl + IP8
DI" Ppl " it is obvious. In the above embodiments, the case where the fixed electrode includes the
electret which does not need to use the bias power source has been described, but the present
invention is not limited to this, and if the bias power source is used, it does not include the
electret. It is a matter of course that various modifications may be made without departing from
the scope of the present invention, in addition to being a fixed electrode.
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4. Brief description of the drawings. FIG. 11 and FIG. 2 are block diagrams showing conventional
single type and push-pull type electrostatic electroacoustic transducers, and FIG. 8 is an
electrostatic electroacoustic transducer of the present invention. FIG. 4 is a diagram showing an
example of measurement of sound pressure and distortion in comparison with the conventional
example. 20: fixed electrode, 2Il, 221: back electrode, 212. 222: electret, 23.24: spacer, 2, 5. 26:
diaphragm (movable electrode), 27 иииTrance. -One applicant patent attorney Takehiko Suzue \ 1
r! A 2 years old 3 figures 4 WA ? ? 9 @ ((H2)-? i ? (to H2) (b) Ass '/ ? ? ? ? ((4 fL, east)
standing (C) Z' 4 / ? ? ? ? ? (? End ? ?) EndPage: 7, ', 2. . ':' Procedure for correction of
procedure, 1i 14-9, ?? Director of the Patent Office-Hideo Saito 1, display of the case ? ?
Japanese Patent Application No. 49-20162. No. 2, title of the invention, -2, title of the invention,-3. Person who makes correction Related patent applicant '(807) Tokyo Shibaura Electric Co., Ltd.
4, ░ agent 6, correction target object ?? RK = l'oa'OFi0Bt, иии, the content of the correction (in the
specification, page 5, line 19, rK--, -7 = ?-и и и и и и и " и и и и и и и и и и Songs, songs (21JK2 r и ?o8
correct. @) In the specification, page 6, line 5 to line 10, ?from the above ? (in the range of the
above equation (11)... иииииииииииииииииииииии Also, the effective mechanical impedance (ZM, in the above
equation 1) is ka <1 (where 1 ? / C?2?f10 ░ where 0: sound velocity And t sZM-s-(M + 2 Ma)
7 и ? with respect to the mass M of the vibrating film described later in the range of t> to (where
fo is the resonant frequency) From the above equation (1), correct as. Patent Secretary General
Saito Hideo ?, the display of the case Japanese Patent Application No. 49-20162 "2 1" title of
the invention 2 1 1 title of the invention electrostatic type electroacoustic transducer / 3, patent
related to the case of correction Applicant (307) Tokyo Shibaura Electric Co., Ltd.-4, agent "
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