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JPS57117898

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DESCRIPTION JPS57117898
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view of a
condenser microphone according to the present invention in a normal state, FIG. 2 is a view
when the condenser microphone is overloaded, and FIG. It is an enlarged view of a part.
DESCRIPTION OF SYMBOLS 1 ... Diaphragm, 2 ... support part, 3 ... counter electrode, 3
'protrusion edge, 4 ... opening, 5 ... protrusion part, 5 -'... recess.
DETAILED DESCRIPTION OF THE INVENTION According to the present invention, it has a pair p
'electrode having a surface provided with a projection and a diaphragm disposed at a short
distance from the surface of the other 11 One 09G ゑ 1. It relates to a capacitor my 1 crophone
made of electret material of \ 2 and ^ / 77 ppS '. The present invention is applicable to a
microphone made of a material capable of forming an electrode or a diaphragm or both of them
as an electret (permanently polarized I collector) as described above. In general, in a condenser
microphone, the conductive diaphragm is disposed at a short distance from the flat conductive
surface of the counter electrode. The electrodes can be made of metal directly, or can be made of
a plastic surface and subjected to a metallizing treatment on its surface. In general, the distance
between the counter electrode and the diaphragm is 30-.mu..mu. (Micron), and the electrode is
coated with a thin lacquer layer, or provided with a required insulating bit by using a plastic foil
which has been subjected to vapor deposition treatment on one side. Conventionally, the
condenser microphone is connected to the computer through high ohms a resistance, and the
external supply voltage is approximately-. Movement of the diaphragm causes a direct change in
voltage which is picked up by the high ohmic resistance amplifier. Microphones of this type have
high cost, high cost 1 o, 79 価, and are difficult to produce because the fee is too high for
manufacturing. In order to solve such a defect, it has been attempted to provide projections at
several hundreds of millions of Ph or a certain area to support the vibrational root, to facilitate
manufacturing assembly of the microphone and to improve the operation reliability. However,
this proposal has the disadvantage of reducing the efficiency of the vibration & surface and
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interrupting its movement, thereby reducing the sensitivity, especially in microphones with
unidirectionality. Is known to be In principle, such means can not achieve the optimum fcharacteristic change characteristic 1 and therefore, in practice, attempts to partially support the
protein are abandoned, and the form or practicality of the capacitor microphone as
conventionally known It had been. Since the sensitivity 1 of the condenser microphone is directly
proportional to the applied dell pressure, ie, the polarization voltage, it is better to raise this
voltage as much as possible. In fact, it is only possible to add terms up to the limit value of this
value. When this 1 overly loud sound Ippuda etc. occurs, electrostatic liquid 1 1, 3, 10! This is
caused by the fact that the diaphragm is not squeezed out of the electrode by +8 relay attractive
force. This means that the mechanical return force of the diaphragm is greater than the
attraction of the electrode at any moment, and in particular, the return force must be large even
after the diaphragm contacts the electrode.
When the diaphragm is made of electret foil (permanently polarized dielectric foil), the charge is
not evenly distributed to all the foils, and another burden is that the t load differs depending on
each of the six foils. Accompany. Countermeasures for this problem in the past are the
diaphragm and counter! ! It was only to increase the distance between the other poles, which
lowered the sensitivity to large wheels. Further, if the counter electrode itself is made of an
electret material and the surface is metallized, no improvement is made. The present invention
seeks to remedy the aforementioned drawbacks. The condenser microphone according to the
present invention has an opposing IE provided with a projection and a diaphragm disposed on
the surface of this TIE surface for a short distance, and the length of the projection projecting
from the electrode surface is an electrode and a peristalsis. It is configured to be smaller than the
distance / distance of the light source 1099 and to leave room for the diaphragm to vibrate
without being disturbed when a normal pressure comes to the microphone. In the 9th invention
microphone, the vibration & not always contact with the electrode at all in normal cases, and the
vibration 愼 follows the vibration of the sound. In the case where an excessive force such as IIM
is applied, one of the inventive microphones! The ridges of the wedge prevent at least most of the
surface from contacting the t-pole surface without completely preventing 'am' on the electrodes
of the diaphragm. In such a case, the force acting on the diaphragm is only a few minutes
compared to the force when the diaphragm touches the surface of the counter electrode.
Therefore, after the excessive external force is stopped, the mechanical tension of the diaphragm
can return it to the light source position. Even if the force from the outside is extremely large,
and the imaging plate contacts one other if the projection plate is provided even if the projection
is provided on the turtle eye, a large restoring force is generated at each individual projection,
and the @ motion The board is returned to the original position after such an external force
disappears, and the brows and bubbling 1100 〇 This invention is generally used for capacitive
transducers. In particular, it is advantageous to apply it to a capacitor converter having a voltage
generation according to the electret principle. In this case, it is not particularly important
whether it is an electret diaphragm or an electret electrode. According to the present invention,
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the polarization voltage can be increased or the distance can be decreased by using electret
effective rice, so that the sensitivity can be increased. As a rule, in order to exert the effect of the
present invention, it is sufficient to provide a projection having a flat end surface on the side
facing the peristalsis from the object II.
However, if the end of each protrusion is not flat but concave, the effectiveness of the present
invention is increased by -I-. In this case, the vibration value is self-contacting to the projection,
and the peristalsis has a wave shape, and its bending rigidity makes the electrode more fi! It
becomes difficult to touch. The present invention will be described below with reference to the
drawings. The original proposal Conden's 11 o 1 · The microphone indicated by # in FIG. 7 in a
schematic manner is not intended to give a practical scale but to show its principle t-H. The
present microphone has a diaphragm 1 made of, for example, electret foil. This electret foil is
attached, for example by means of an adhesive, to a ring-shaped support S- of insulating material.
The zero counter electrode J has a ring-shaped protruding edge 3 'for fitting and fixing the
counter electrode 3 from the bottom of the support portion-and thereby the depth of the counter
electrode 3 or the ring 9 Determine. As in the general case, the counter electrode 3 is provided
with a plurality of openings l, and the air chamber under the vibration & l is allowed to flow to
the outside air. The projections j are disposed on the web between the open holes 3 of the
opposing plate 3 to make the arrangement into a regular shape. The simplicity of the projection j
is the distance #l! Between the electrode 3 and the diaphragm l. Try to leave the FI4 two on the
lower side of the vibration 4fi4 / without being equal to five. When the number of projections j is
not particularly large, assuming that the height on the II side is about 2/3 soil, it is good 0 In this
case, the vibration & l vibrates to confession and free vibration height 1- / 3 soil Have. In the
practical example, eight is about Q μm. The vibration @ / is pressed against the electrode 3
when excessive stress is applied to the heart 102 vibration & l. According to the invention 1!
Since the projection j is dispersed in l 憔 3, the diaphragm l can be prevented from adhering and
holding to the electrode 3. As shown in FIG. 1 in cross section, the 0 projection j which occupies l
acts as a support for the diaphragm and the projection of the electrode 3! Prevents the
diaphragm l from coming into contact with the place where the The electrostatic attraction
increases in direct proportion to the contact surface, but decreases in proportion to the square of
the distance between the opposing surfaces, so that in the condenser microphone according to
the invention, the diaphragm is subjected to excessive stress. The electrostatic attraction that
occurs is only a few tenths of that when the diaphragm l is bonded to the electrode aJ. Therefore,
in any case of the condenser microphone according to the present invention, the tension of the
diaphragm l is properly maintained, and the diaphragm l returns to the original position when
the excessive stress disappears. The end face of the projection [jrj diaphragm side may be a flat,
circular cast shape. However, as shown in FIG. 3, if the end face of the projection j is concave, it is
particularly advantageous when the stress 103 ^ applied to the vibration value is excessive and
this is pressed against the electrode.
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By making this end face concave, the mechanical tension and return force of the vibrator are
provided with a large number of 0 projections j [41 even when the surface is metallized, the end
face of the projections j is a metal member It is particularly advantageous if you do not
Compared with the prior art, the condenser microphone according to the present invention has a
great practical advantage in that the reproduction characteristics are improved in the case of the
sensitivity or at least in the case of at least the sensitivity.
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