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JPS5593191

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5593191
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross sectional view showing a conventional
condenser type microphone, and FIG. 2 ayb is a cross sectional view showing one embodiment of
a condenser type microphone according to the present invention and a part of its attachment
structure portion Notched plan view, FIG. 3 a, b. C is a side view showing another example of the
FET used in FIG. 2 and a partially cutaway sectional view illustrating the mounting state thereof,
and FIG. 4 is a partially cut away sectional view showing another mounting structure of the <FET
FIG. 11 иии Case и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
и ring, 15 и и и и и и и и и 16 ...... mounting structure, 16a ...... periphery, 16b ...... anchoring piece, 16c
...... pedestal, 16d ...... recess (air Chamber '), 16e и и и и и и и и и и и и и и и и и и и vent holes, 16f и и и и и и и
recessed portion 16g и и и и и guide holes, 16h и и и и guide pins, 17 и и и и и и fixed electrode , 1B... (For
preamplifier, circuit element for impedance conversion) FET, 18 g... Gate electrode 18 d .. Drain
electrode 1.18 s. source electrode, 19 ... ... printed circuit board, 19a ...... vent Kazunori, 19b- и recess, 19c, 19d, 19e и и и ... pattern, 20 ...... damper.
DETAILED DESCRIPTION OF THE INVENTION This invention relates to a condenser microphone.
In particular, it relates to the improvement of the unidirectional inner microphone. ????
Recently, in condenser type microphones, circuit elements such as pre-amplifiers are organically
incorporated into the microphone body as part of the trend toward miniaturization. ? The socalled inner microphone is realized. FIG. 1 is a book showing such an inner microphone
particularly known as a substrate type. That is, first, the diaphragm assembly 3 is disposed to
face the sound receiving hole 2 of the case 1. Here, the diaphragm assembly 3 is formed by
stretching the diaphragm 4 between the fixing ring 5 and the spacer 6. Next, the fixed electrode
10 having the small hole 9 is brought into contact with the spacer 1f K via the damper 8C of the
frame 8 having the wedge 7 to be engaged with the case iyc @ Wear it as you go. Further, the air
chamber 12 is formed by closing the other opening of the frame 8 with the printed wiring board
11. Further, in the air chamber 12, a circuit element 13 is accommodated in the air flow (?1:?)
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for forming a pre-amplifier mounted on the printed wiring board 11. In addition, the horizontal
holes 1a and 8a formed in corresponding parts of the case 1 and the frame 8 and the tamper
mounting base Ib. When the damper 8C is present, the directivity is unidirectional, and when the
damper 8C is absent, the directivity is omnidirectional. In addition, since the book is necessary to
increase the capacity change due to the air chamber 12 Fi diaphragm 4, the air chamber 12 to be
a compensation result through the small holes 9 and 8 d of the fixed electrode 10 and the
damper mount 8 b is provided. By. The capacity change obtained by removing the suppression
effect on the vibration of the diaphragm 4 is made large. By the way, one or more of the
substrate-type inner microphones have achieved some success in downsizing, but in other
respects there is much room for improvement as there is no difference from the previous one. .
That is, the recent need is not only to reduce the size, but also to point out the coexistence with
the improvement of the cost allowance, such as Fi. However, the conventional ones can not meet
the various needs as described above because no consideration is given to the performance and I
++ 4 in particular, in terms of workability and price, etc. The That is, in the conventional one
including the one in FIG. 1 in the attachment structure of the diaphragm and the fixed electrode
which is the heart, only the diaphragm is placed on the apertured fixed electrode via the spacer.
The effective utilization of the area of the diaphragm and the fixed electrode where the planar
drive is inhibited due to the so-called edge effect is low, and the distortion characteristic is poor.
And, when an expensive electret is used for the fixed electrode, the electric charge can not be
used effectively, so that so-called paris or warpage may occur due to the presence of the
perforated portion and the effective drive capacity is reduced. Leading to the disadvantage that
the conversion efficiency is poor (the same as in the case of a regular fixed electrode).
Furthermore, the cost increase due to the presence of the spacer and the increase in the number
of operation steps are problems, and the attachment structure of the fixed electrode itself and the
lead extraction thereof are complicated and the 1 'cam lock! Oh, I had the problem of being weak.
In addition, the horizontal holes formed in order to achieve unidirectionality are complicated
because they require positional alignment between the case and 7 frames, and in this case, an
adhesive is used to provide a damper for providing the lower 1c filter effect of the fixed
electrode. Since the flatness of the fixed electrode will vary due to variations in the thickness of
the adhesive or damper (usually paper or cloth), it is undesirable to have variations in sensitivity
or adsorption of the diaphragm. It was easy to bring the situation. And while such a structure to
obtain unidirectionality is basically required to cancel the sound source of 180 ░ phase
difference, it is a system replaced by 90 ░ phase difference, so a very good directivity is
obtained. It was nothing. For this reason, it is an urgent task for capacitor microphones in general
and also for inner microphones to eliminate the above-mentioned drawbacks. Moreover, in the
case of an inner microphone, it is strongly desired to exhibit its function more organically.
иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии ░ и It is an object of the present invention to
provide a very good capacitor-type microphone which is capable of achieving the function as an
inner microphone more organically as it is obtained. A positioning mechanism is provided
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between the corresponding parts of the plate and one is convex and the other is concave so that
a stable unidirectionality can be obtained. An embodiment of the present invention will be
described in detail with reference to the following drawings. That is, in FIG. 2 (a), 11 is a metal
case such as aluminum in which a plurality of sound receiving holes 12 are formed in a portion
VC11 when it is formed into a bottomed cylindrical shape having an outer diameter of about 101
m by drawing. is there. Then, the diaphragm assembly 3 is flared against the inner bottom
portion Vcd sound receiving hole 12 of the case 11.
1; '1. '! : Here, diaphragm plate 3 made of a metal foil such as aluminum is previously stretched
under metal ring 14 which is fitted to the inner bottom portion of case 11 to make an electrical
contact. It will be In addition, a predetermined gap (for example, about 0.1 inch) is placed on the
peripheral portion 16m and the diaphragm 16 for sandwiching the above-mentioned diaphragm
assembly IS in the case 11 without using a spacer in the case 11 and fixed electrodes A mounting
structure 16 made of an insulating material having a plurality of fixing pieces 16b for arranging
11 and a fixing pedestal 16C and the like is inserted in a state in which the fixed electrode 17 is
fixed in advance as shown in the drawing. Here, as one of the fixing pieces 1 # bFi of the
mounting structure 16 is taken out and shown in FIG. 2 (b), it has an elastic effect by being
protruded from the recessed portion 16d to be an air chamber. In the illustrated case, it is
assumed that a total of four are formed at intervals of 90 degrees. The fixed electrode 11 is
tightly fixed on the pedestal 16C by utilizing the elastic effect of the fixing piece 16bK of the
mounting structure 16. In this case, the fixed electrode 11 itself has a vent hole as in the
conventional case. It is not possessed. Further, although the predetermined gap provided
between the fixed electrode 11 and the diaphragm 15 is set by the difference in bulk between the
peripheral portion 16m of the holding structure 16 and the pedestal 16c, this makes it possible,
as in the prior art. A spacer is not used to obtain a predetermined gap. Further, the abovementioned additional structure 16 is formed at its bottom with a vent Jge for communicating
with the recessed portion J6 and the air chamber and for obtaining unidirectionality Jge, and a
preamplifier at substantially the center. A circuit element for forming a tube, for example, a
concave portion if for press-fitting and accommodating a field effect transistor (FIT) 1g for
impedance conversion and a gate electrode 111g of the FET 1a embedded so as to be pressed-in
to the concave portion 11if of the fixed type & 17. A guide hole 76g for electrically contacting
the back surface is formed. Then, after embedding <FF 1 T ::, ?C ? ? 1 +, J ? own case 18 as
shown in the holding structure 16, the printed wiring board 19 in which the air holes lem are
formed corresponding to the air holes 16 eK is The damper 20 is mounted in the case 11 with
the damper 20 sandwiched between the bottom of the mounting structure 16 and the mounting
structure 16. In this case, the printing and distribution board 19 is positioned by a positioning
mechanism comprising a guide pin 16b projecting from the bottom of the mounting structure 16
characterized by the present invention and a recess 19b fitted with the guide bin zgh.
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In addition, the FET 1go is projected to the back of the printed wiring board 19 by this. -24 drain
electrode and source electrode JIIS, its butterf, 3, Q,%. It is soldered to the Ii-Dan J # C, Jjd
section. After that, the open end of the case 1) is narrowed inward to complete the condenser
microphone, in particular, the inner microphone of the d-deformation substrate type. Here, the
case l1f) is touched with the ground (co-A) pattern 196 @ vc of the printed wiring board 19 by
electrical crimping by caulking so that the open end is narrowed inward. As a result, each pattern
19c, led, 19e may be used as the outer lead terminal. The description given in the above five or
more indicates a configuration for obtaining unidirectionality, and in the case of obtaining
nondirectionality, the vent hole 16e of the mounting structure 16 in the above configuration. The
dampers 20 and the vent holes 19a of the printed wiring board 19 may be omitted. Thus, in the
condenser type microphone having one or more configurations, in the attachment structure of
the diaphragm and the fixed electrode, which is the heart, the vibration is simply put on the
perforated fixed electrode through the spacer as in the conventional case. Instead, the fixing
piece Jib and the pedestal 16CK of the mounting structure 16 having the peripheral portion J6a
for clamping the diaphragm assembly 13 formed by stretching the diaphragm 15 below the ring
14 without using the spacer. A fixed electrode 17 which is non-perforated and smaller in
diameter than the effective vibrating part of the diaphragm 15 is fitted to the diaphragm 15 with
a predetermined gap. By this, first, the fixed electrode 17 is made smaller in diameter than the
effective vibrating portion of the diaphragm 15, that is, the diaphragm 15 does not get on the
two-pole electrode 11: h Since it is possible to use only the portion of the entire area of the
diaphragm 15 which can be driven flat as much as possible without receiving the edge effect as
in the prior art, the effective utilization rate of the diaphragm 15 and the fixing 111 is
consequently obtained. Thus, it is possible to improve the distortion characteristics. Further, the
material cost can be reduced due to the small area of the fixed electrode 11, which is particularly
effective when using an expensive electret, and since there is nothing to contact with the surface
at that time, the charge of that portion is It is efficient because it can prevent the decrease and
contribute the total charge to the drive. Further, since the non-porous fixed electrode 1r can be
used, there is no warpage in Paris caused by the presence of the perforated portion as in the
prior art, and the boring step thereof can be omitted and it can be easily manufactured with only
a round shape. It is possible to further improve the conversion efficiency by further increasing
the effective drive capacity only for the portion without the.
In particular, this is very advantageous because it is effective when using electrets and can
maintain uniformity of one surface charge. By the way, in this case, the non-porous fixed
electrode can be formed by sticking out the fixed piece 16b fixing the fixed electrode 17 or from
the inside of the recessed portion 16d serving as an air chamber, and the fixed electrode 17 itself
is vented. This is because there is an air chamber, i.e., a recessed portion 16 d for removing the
suppression effect on the vibration of the diaphragm 15 even without providing the. Further, the
air chamber as the compensation volume is one in which VC is sufficiently secured by a recessed
portion having a volume as illustrated. In other words, it is meaningless to make the volume of
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the air chamber larger than necessary, which is not preferable because it is a factor to inhibit the
cabin formation. From this point of view, it can be understood that the above-mentioned recess
16dK is reasonable. Further, since it is not necessary to use a spacer, it is possible to reduce the
number of parts and the number of operation steps accordingly. This is advantageous because it
eliminates the ineffective capacity generated in the spacer portion, that is, the capacity that does
not contribute to driving of the diaphragm and only the truly necessary effective capacity. When
the electret fixed electrode is used in%, it is effective because there is no voltage deterioration
caused by the spacer contacting the electret surface. Furthermore, although the fixed electrode
17 is sandwiched by the fixing piece 1trb which is protruded from the inside of the recessed
portion 16e of the mounting structure 16 at the peripheral side portion, it is possible to give an
elastic effect to the fixing piece Jib. It is necessary 11 as an air room without being fixed either!
Since it is secured by being formed so as to project from the inside of the concave portion 16d,
there is an advantage that it is extremely convenient in manufacturing and can be rationally
made organic and firmly fix the fixed electrode. Further, according to this, since the air chamber
is not formed immediately below the fixed electrode, an air chamber not limited by the length of
the electrode electrically brought into contact with the back surface of the fixed electrode can be
arbitrarily formed. It is possible to improve the sensitivity. Furthermore, the capacitor type 73-1 и
1 electronic phone according to the above-mentioned configuration is not provided with the sVC
damper under the fixed electrode as well as with the lateral holes in the case and the frame as in
the prior art in order to obtain unidirectionality. A damper is provided between a vent hole 16e
in the longitudinal direction provided in the bottom portion of the mounting structure 16 and in
communication with the rear of the recessed portion 1ed serving as the air chamber and a vent
hole 19a of the printed wiring board 19 provided corresponding to the vent hole J6e. It is made
by sandwiching 2o.
By this, since it is not necessary to form a horizontal hole in case 11 first, processing costs can be
reduced. Since there is no need for alignment with the lateral holes formed in the frame, it is
simple and easy to automate. Moreover, since a source having substantially 1000 phase
differences can be canceled, it is possible to obtain better unidirectionality. Moreover, since the
damper 20 is provided on the printed wiring board 1 # at the bottom of the mounting structure
16, the adhesive can be eliminated and the cost can be reduced and automation can be easily
achieved. Also, since this does not have any influence on the flatness of the fixed electrode as in
the prior art 4-1, there is a possibility that an undesirable situation such as variation in sensitivity
or adsorption of the diaphragm occurs. It can be prevented. Further, in this case, by the
positioning mechanism which is a feature of the part side wiring board 19Fi according to the
present invention, the guide bins 16h projected from the bottom of the mounting structure 16
are fitted in the recesses 19b without causing sound leakage. Since it is attached to the bottom of
the mounting structure 16 in the state as it is, when the open end of the case 11 is crimped, it is
closed to take a regular position without positional deviation. As a result, it is possible to
eliminate the positional deviation of the electrode connection patterns J # C and led, and to
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prevent the vent hole 111e of the mounting structure 16 from being blocked in advance. That is,
to obtain good single directivity without wobble. It is secured. By the way, the FETJIItl in the
above is embedded so that its main body portion is press-fitted into the recess 1 gf provided in
the bottom of the mounting structure 16, and the saw pole 5 ag passes through the guide hole
16 g to fix the fixed electrode It is electrically contacted to the back surface of 12. Therefore, the
gate electrode lag of the FET 1a has an elastic effect so as to be more flexible than the other
drains 18d and the source electrode 183, and it is to be in contact with the back surface r of the
fixed t & 17. desired. That is, in the absence of such assignment, electrical contact between the
gate electrode lag and the fixed electrode 11 can not be obtained. ??? The drain electrode 1
ad and the source electrode 18 S are soldered to the printed wiring board 1 g and sometimes
used as an external lead-out terminal in some cases, so it is preferable to be as strong as possible.
That is, FBTJ # used for this type of modified substrate type requires that its electrode structure
be formed so as to be distinguished in strength and application.
FIG. 3 exemplifies an FF 1 T 18 which can meet such a demand, and (a) shows the gate electrode
lag being paired with the source electrode 18 s or the drain electrode lad 6 to make it thin or to
change the material to make it flexible. It is a book of sex. Further, in the fb1 figure, by bending
the gate electrode Jl1g into a waveform, as shown in the (C) figure, a more excellent contact can
be obtained by increasing the penetration when contacting the back surface of the fixed
electrode 17 It is a thing. Thus, using the gate electrode zag which takes such consideration into
consideration can make contact with the back surface of the fixed electrode 11 simple and good,
and it is not necessary to use welding, soldering, adhesive, so it is It is possible to reduce the
number of workers at work to improve cost reduction and yield. Further, in this case, since the
body portion of FHTxaFi is embedded so as to be press-fit into the concave portion 1if formed in
the bottom portion of the mounting structure 16, in the normal case, an undesirable
phenomenon of so-called sound leakage can be avoided. The VC, FET 18 has its main body
generally formed in a rectangular parallelepiped, and the dimensional tolerance of the recess 16f
of the mounting structure 16 corresponding thereto causes noise leakage through the gap 7 иии j. I
tend to. When the mounting structure 16 is manufactured by molding, the recess 16i needs to be
slightly tapered for die-cutting, which is easily facilitated. In addition, in some cases, it may tend
to occur that the opposite VcFET 1g can not be press-fitted into the recess 16f VC. Furthermore,
in the case of automation, if the cross-sectional shape is rectangular, positioning is required at
the time of press-fitting, which makes automation difficult. Therefore, it is desirable to provide a
mounting structure of pn'r 1g for which both IC and press-in can be easily carried out, as it is
possible to prevent in advance the flatness of the frequency characteristic caused by the sound
leakage. FIG. 4 shows the mounting structure of FETJ & which meets such a requirement. In this
case, the shape of FET JJI itself is formed in a cone shape (in particular, a cone shape), and the
gate electrode iag is formed on the small diameter portion side. This is a structure in which the
portion IIIK source electrode IJs and the drain electrode JJd are disposed. The recess 16f itself of
the mounting structure 16 is also formed in a tapered shape corresponding to the pyramidal FET
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1g8-. As a result, since it is possible to press-in easily regardless of the dimensional tolerance of
each #i 5 and sound leakage can be completely prevented, it is possible to obtain frequency
characteristics with better flatness and positioning at the time of press-fitting Since it is
unnecessary, automation is extremely easy.
Further, also when the mounting structure 16 is molded, it is convenient because the recess 111
is tapered in advance. Therefore, as described above, according to the present invention, by
providing a positioning mechanism in which one is convex and the other is concave between
corresponding parts of the mounting structure and the printed wiring board, the drawback of the
conventional structure for obtaining unidirectionality is provided. It is possible to provide a very
good condenser-type microphone which can remove the function of the inner microphone more
organically by%, while eliminating the
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