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JP2010050869

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DESCRIPTION JP2010050869
An object of the present invention is to securely connect a fixed electrode and an extraction
electrode by a simple operation without generating noise due to extraneous vibration and
without adversely affecting the directional frequency response. A diaphragm (21), a fixed pole
(23) opposite to the diaphragm (21), the fixed pole (23) supported at one end, and a back air
chamber (242) of a predetermined volume is formed on the back side of the fixed pole An
insulating seat 24 having a through hole 244 communicating with the back air chamber 242 on
the end side, and an extraction electrode 25 press-fit into the through hole 244, the fixed
electrode 23 and the extraction electrode 25 inside the back air chamber 242 In the condenser
microphone unit electrically connected by the conductive means provided, as the conductive
means, one end 50a is in contact with the lead-out electrode 25 in the through hole 244 and the
other end 50b is on the back side of the fixed pole 23. A strip-like plate spring 50 that elastically
contacts is used. [Selected figure] Figure 1
コンデンサマイクロホンユニット
[0001]
The present invention relates to a condenser microphone unit, and more particularly to a
conduction means for electrically connecting a fixed pole and an extraction electrode.
[0002]
As shown in FIG. 3, as a basic configuration, the condenser microphone unit is a cylindrical unit
made of a metal material having a front acoustic terminal 11 on one end surface side and an
open end 12 on the other end surface side. A case 10 and an electrostatic type acoustoelectric
converter 20 housed in the unit case 10 are provided.
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1
[0003]
In the acoustoelectric converter 20, a diaphragm 21 tensioned to a support ring (diaphragm ring)
22 with a predetermined tension and a fixed pole 23 supported by an insulating seat 24 are
disposed opposite to each other via a spacer ring 25. It is constituted by doing.
[0004]
In this example, after the acoustoelectric transducer 20 is housed in the unit case 10, it is
pressed and fixed by the lock ring 13 screwed into the opening 12 of the unit case 10, but
particularly inexpensive mass-produced models In many cases, the acoustoelectric converter 20
is pressed and fixed by caulking the open end of the unit case 10.
[0005]
Referring also to FIG. 4, the insulating seat 24 is made of a synthetic resin material, and a recess
241 in which the fixed electrode 23 is press-fit fitted is formed on one end side thereof.
A back air chamber 242 having a predetermined volume is provided in the insulating seat 24 at
the back side of the fixed pole 23.
[0006]
In addition, a cylindrical portion 243 having a through hole 244 communicating with the back
air chamber 242 is integrally formed on the other end side of the insulating seat 24, and the lead
is electrically connected to the cylindrical portion 243 with the fixed pole 23. The electrode 25 is
fitted.
[0007]
The vibrating plate 21 is vibrated by the incoming sound wave, and thereby the capacitance
between the fixed electrode 23 changes.
The signal of this change in capacitance is output from fixed pole 23, but since its output
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impedance is extremely high, in the condenser microphone unit, a low impedance audio signal is
obtained through impedance converter 30. There is.
[0008]
Usually, an FET (field effect transistor) is used for the impedance converter 30, but in rare cases
a vacuum tube may be employed.
[0009]
In this example, the impedance converter 30 is mounted on the circuit substrate 31 on the side
of the microphone main body (not shown), and the gate terminal 30a of the impedance converter
30 is connected to the lead electrode 25 when connecting the condenser microphone unit to the
microphone main body. Contact.
[0010]
The fixed electrode 23 and the extraction electrode 25 are connected via a predetermined
electrical wiring system, but since the connection portion has a high electrical impedance, noise
(different Sound) may occur.
[0011]
In order to eliminate this point, in the invention described in Patent Document 1, as shown in
FIG. 3, the fixed electrode 23 and the lead-out electrode 25 are electrically connected by the
ribbon foil 40 made of metal foil such as aluminum plastically deformed. I am trying to connect.
[0012]
Here, an example of the connection operation by the ribbon foil 40 will be described with
reference to FIGS. 4 (a) to 4 (c).
First, as shown in FIG. 4A, the ribbon foil 40 cut into a slightly longer length is passed from the
back air chamber 242 of the insulating seat 24 to the inside of the through hole 244.
[0013]
Next, as shown in FIG. 4B, the lead-out electrode 25 is press-fit (forced fitting) into the through
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hole 244, and one end 40a side of the ribbon foil 40 is fixed in the through hole 244.
[0014]
Thereafter, as shown in FIG. 4C, the fixed electrode 23 is press-fit into the recess 241 of the
insulating seat 24, and the other end 40b of the ribbon foil 40 is the outer peripheral surface of
the fixed electrode 23 and the inner peripheral surface of the recess 241. And the excess portion
protruding outside is cut with a cutter or the like.
[0015]
Japanese Utility Model Publication No. 04-50995
[0016]
According to the invention described in Patent Document 1 described above, the ribbon foil 40 is
plastically deformed and does not vibrate due to external vibration, so that noise (noise) caused
by the vibration hardly occurs, but the following problems to be solved There are points left.
[0017]
That is, since the other end side 40 b of the ribbon foil 40 is sandwiched between the outer
peripheral surface of the fixed electrode 23 and the inner peripheral surface of the recess 241,
the recess 241 of the insulating seat 24 is deformed by the thickness of the ribbon foil 40, There
is a slight gap, however.
[0018]
Then, the air existing between the diaphragm 21 and the fixed electrode 23 leaks from the gap.
This air leakage causes deterioration of the directional frequency response particularly in units
with high mechanical impedance, such as microphone units used in narrow directional
microphones.
[0019]
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In addition, in terms of workability, since it is necessary to cut excess ribbon foil with a cutter or
the like, an operation man-hour is required.
In addition, if the disconnection is improper and a protruding portion is left on the other end 40b
side in particular, the remaining portion may contact (short circuit) the unit case 10 and an audio
signal may not be output.
[0020]
Therefore, it is an object of the present invention to connect the fixed electrode and the
extraction electrode electrically without generating noise (noise) caused by external vibration and
without adversely affecting the directional frequency response. An object of the present
invention is to ensure that the fixed electrode and the lead-out electrode can be connected by a
simple operation.
[0021]
In order to solve the above-mentioned problems, the present invention supports a diaphragm
extended on a support ring, a fixed pole disposed opposite to the diaphragm via a spacer ring,
and supports the fixed pole on one end side. A back air chamber having a predetermined volume
is formed on the back side of the fixed pole, and an insulation seat having a through hole
communicating with the back air chamber on the other end side, and a lead electrode forcibly
fitted to the through hole A condenser microphone unit including the fixed electrode and the
lead-out electrode electrically connected by the conduction means provided in the back air
chamber, wherein one end of the conduction means is in the through hole as the conduction
means. It is characterized in that a strip-shaped plate spring is used which is in contact with the
lead-out electrode and the other end elastically contacts the back side of the fixed electrode.
[0022]
In the present invention, it is preferable that an elastic body for pressing the plate spring against
the inner wall surface of the through hole be fitted in the through hole.
[0023]
According to the present invention, in the conduction means for electrically connecting the fixed
electrode and the lead-out electrode, one end is in contact with the lead-out electrode in the
through hole and the other end is elastically in contact with the back side of the fixed electrode.
By using a leaf spring, firstly, noise (noise) caused by external vibration is not generated, and
secondly, the concave portion into which the fixed electrode of the insulating seat is pressed is
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not deformed, so air leakage The deterioration of the directional frequency response is
prevented, and thirdly, the cutting operation is unnecessary, the workability is improved, and
there is also an effect that there is no possibility that the leaf spring comes in contact with the
unit case.
[0024]
Further, by fitting an elastic body for pressing the plate spring to the inner wall surface of the
through hole in the through hole, the plate spring is braked by the elastic body, so noise (noise)
caused by the external vibration is further generated. It can be prevented reliably.
[0025]
Next, an embodiment of the present invention will be described with reference to FIGS. 1 and 2,
but the present invention is not limited thereto.
FIG. 1 is a longitudinal sectional view showing a condenser microphone unit according to the
embodiment, FIG. 2 (a) is an exploded sectional view on the fixed electrode side, and FIGS. 2 (b)
and 2 (c) are explanatory views showing connection work steps.
Components substantially the same as those of the condenser microphone unit described as the
prior art in FIG. 3 are denoted by the same reference numerals.
[0026]
With reference to FIG. 1, the condenser microphone unit according to this embodiment also has
the front acoustic terminal 11 on one end face side as another basic configuration as the
condenser microphone unit described in FIG. A cylindrical unit case 10 made of a metal material
whose end face side is opened as an opening 12 and an electrostatic type acoustoelectric
converter 20 housed in the unit case 10 are provided.
[0027]
In the acoustoelectric converter 20, a diaphragm 21 tensioned to a support ring (diaphragm ring)
22 with a predetermined tension and a fixed pole 23 supported by an insulating seat 24 are
disposed opposite to each other via a spacer ring 25. It is constituted by doing.
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[0028]
In this embodiment, the unit case 10 is made of a highly rigid metal material such as brass alloy,
and the acoustoelectric converter 20 is screwed into the opening 12 of the unit case 10 after
being housed in the unit case 10. Although the unit case 10 is pressed and fixed by the lock ring
13, the unit case 10 may be made of, for example, aluminum which is easy to be crimped, and
the acoustoelectric converter 20 may be pressed and fixed by caulking the opening end edge of
the unit case 10.
[0029]
Referring also to FIG. 2A, the insulating seat 24 is made of a synthetic resin material, and a recess
241 into which the fixed electrode 23 is press-fit fitted is formed on one end side thereof.
A back air chamber 242 having a predetermined volume is provided in the insulating seat 24 at
the back side of the fixed pole 23.
[0030]
In addition, a cylindrical portion 243 having a through hole 244 communicating with the back
air chamber 242 is integrally formed on the other end side of the insulating seat 24, and the lead
is electrically connected to the cylindrical portion 243 with the fixed pole 23. The electrode 25 is
fitted.
As shown in FIG. 1, the gate terminal 30 a of the impedance converter 30 contacts the extraction
electrode 25.
[0031]
In this embodiment, the impedance converter 30 is mounted on the circuit substrate 31 on the
side of the microphone main body (not shown), and when the capacitor microphone unit is
connected to the microphone main body, the gate terminal 30a of the impedance converter 30
serves as the extraction electrode 25. Alternatively, an impedance converter 30 may be provided
in the condenser microphone unit.
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[0032]
Usually, an FET (field effect transistor) is used for the impedance converter 30, but in rare cases
a vacuum tube may be employed.
[0033]
In the present invention, the fixed electrode 23 and the lead-out electrode 25 are electrically
connected through a plate spring 50 formed in a strip shape (strip shape).
[0034]
As shown in FIG. 1, the plate spring 50 is disposed from the inside of the back air chamber 242
to the inside of the through hole 244 so as to elastically contact the fixed pole 23, the fixed pole
23 and the extraction electrode 25 at the time of assembly. And have a length greater than the
distance between
[0035]
In assembly, first, as shown in FIG. 2B, the extraction electrode 25 is press-fit (forced fitting) into
the through hole 244 from the lower end of the cylindrical portion 243, and one end of the plate
spring 50 from the back air chamber 242 side. The 50 a side is inserted into the through hole
244 and brought into contact with the extraction electrode 25.
[0036]
In this state, the elastic body 60 is pushed into the through hole 244 from the back air chamber
242 side, and the leaf spring 60 is pressed against the inner wall surface of the through hole 244
by the elastic body 60 to fix the leaf spring 60.
For the elastic body 60, a rubber elastic body having a diameter larger than that of the through
hole 244 may be used.
[0037]
Next, as shown in FIG. 2C, the fixed electrode 23 is pressed into the recess 241 of the insulating
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seat 24.
As a result, the other end 50 b of the plate spring 60 is bent and deformed to elastically contact
the back surface of the fixed pole 23.
[0038]
The reaction force causes one end 50a of the plate spring 50 to contact the extraction electrode
25 more strongly, and the elastic body 60 is also compressed along with the deformation of the
plate spring 50, and the plate spring 50 is mechanically damped against vibration. .
[0039]
Thus, according to the present invention, the fixed electrode 23 and the lead-out electrode 25 are
securely connected via the plate spring 50.
Since nothing is sandwiched between the fixed electrode 23 and the recess 241, the air does not
leak due to the distortion of the recess 241.
[0040]
Further, since the plate spring 50 is mechanically braked by the elastic body 60, it does not
vibrate even by the external vibration, whereby the generation of the abnormal sound due to the
vibration is reliably prevented.
Furthermore, unlike the conventionally used ribbon foil, there is no need to cut the end, and
accordingly, the workability is improved and an accident of shorting with the unit case 10 does
not occur.
[0041]
FIG. 1 is a longitudinal sectional view showing a condenser microphone unit according to an
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embodiment of the present invention.
(A) Exploded sectional view at fixed electrode side, (b), (c) An explanatory view showing a
connection work process.
The longitudinal cross-sectional view which shows the conventional condenser microphone unit.
(A)-(c) Explanatory drawing which shows the connection operation process by the conventional
ribbon foil.
Explanation of sign
[0042]
DESCRIPTION OF SYMBOLS 10 unit case 11 front acoustic terminal 12 opening part 20 acoustic
electrical converter 21 diaphragm 22 support ring 23 fixed pole 24 insulation seat 241 recessed
part 242 back air chamber 243 cylindrical part 244 through hole 25 lead electrode 30
impedance converter (FET) 31 circuit board 50 leaf spring 60 elastic body
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