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JP2009118044

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DESCRIPTION JP2009118044
To provide a unidirectional condenser microphone unit having a function equivalent to that of a
rear acoustic terminal hole without providing a rear acoustic terminal hole in a printed circuit
board. Offer. A first air gap 39 is formed in a region other than the flat washer 28 and the earth
side pattern layer 37 when the printed board 33 having the flat washer 28 interposed in the
peripheral edge 38 of one side face 35 is crimped and sealed. And the second air gap 50 formed
between the conductive sleeve 27 and the base material exposed surface 49 from the thin air
layer in communication via the notch 34 formed on the side of the peripheral edge 33 a of the
printed circuit board 33. The sound passage 61 has a function as a rear acoustic terminal. As a
result, it is possible to obtain a unidirectional condenser microphone unit 11 which is excellent in
directional frequency response and in which unnecessary substances such as solder balls are not
mixed. [Selected figure] Figure 1
Unidirectional Condenser Microphone Unit
[0001]
The present invention is a technique relating to a unidirectional condenser microphone unit
capable of providing the same function as the rear acoustic terminal hole without providing the
rear acoustic terminal hole in the printed circuit board.
[0002]
Usually, a unidirectional condenser microphone unit is formed so that sound waves from a
specific sound source can be taken from the front of the diaphragm as well as from the rear
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sound passage formed at the rear.
Moreover, in the rear sound passage, an acoustic resistance material is disposed in order to
adjust the sound pressure and volume velocity of the sound wave. In this case, as also shown in
Patent Document 1 below, the sound wave from the rear is through the rear acoustic terminal
hole provided in the printed circuit board that seals the opening face of the unit case when
crimped. It is common to introduce it. Moreover, as a sound resistance material, in addition to
non-woven fabric and mesh having a sheet shape, a sponge having a certain thickness is
generally used. JP, 2006-74149, A
[0003]
FIG. 3 is an explanatory view showing a conventional example of a single directional condenser
microphone unit different from the above-mentioned patent document 1. Among them, (a) is a
longitudinal sectional view and (b) is shown in (a). Each shows a plan view of the printed circuit
board.
[0004]
According to the figure, the unidirectional condenser microphone unit has a front acoustic
terminal hole 1a on one side, an opening 1b on the other side, a unit case 1 exhibiting a
bottomed cylindrical shape, and a printed circuit board 9 And at least a built-in unit 2 composed
of a plurality of members disposed at a predetermined position in the unit case 1.
[0005]
In this case, the built-in unit 2 includes the diaphragm unit 3 formed by stretching the diaphragm
3b inside the support ring 3a disposed facing the front acoustic terminal hole 1a, and the
diaphragm 3b via the spacer 4 The back electrode plate 5 disposed opposite to each other, the
insulating sleeve 6 disposed between the peripheral end face 5 a of the back electrode plate 5
and the inner peripheral surface of the unit case 1, and the back electrode plate 5 not opposed to
the diaphragm 3 b The air chamber cup 7 is disposed to secure the air chamber A on the back
side, the conductive sleeve 8 disposed in contact with and supported by the back side of the air
chamber cup 7, and the impedance converter 9a. At least the printed circuit board 9 mounted on
the side surface and sealed in the opening 1 b of the unit case 1.
[0006]
Then, after the constituent members of the built-in unit 2 are arranged in the unit case 1
according to a predetermined procedure, the opening 1b is faced inward and the printed circuit
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board 9 is pressed by caulking so that the inside is generated It is stored and held stably under
pressure.
[0007]
In this case, the printed circuit board 9 is caulked by the caulking portion 1 c and the sealing
arrangement is performed on the opening 1 b side of the unit case 1.
As shown in FIG. 3B, an input-side pattern layer 9c for conductive contact with the air chamber
cup 7 is formed on the surface of the printed circuit board 9 on which the impedance converter
9a is mounted. There is.
[0008]
Further, the unidirectional condenser microphone unit shown in FIG. 3 introduces a sound wave
entering through the rear acoustic terminal hole 9 b provided in the printed circuit board 9 into
the air chamber A, and is provided in the back electrode plate 5. Unidirectionality is obtained by
providing a structure for reaching the back surface of the diaphragm 3b through the through
hole 5b.
[0009]
By the way, in the unidirectional microphone unit shown in FIG. 3, a printed circuit board 9
having a plurality of rear acoustic terminal holes 9b is used as a component.
For this reason, external electric noise electrostatically coupled to the fixed pole or the like
connected to the impedance converter 9a penetrates into the unit case 1 from the rear acoustic
terminal hole 9b, generating hum noise. In addition to the inconvenience, there is also a problem
that unwanted matter such as solder balls can be introduced into the unit case 1 through the rear
acoustic terminal holes 9a.
Although it is effective to reduce the hole size of the rear acoustic terminal hole 9b itself as a
countermeasure against these problems, the directional frequency response is disadvantageously
deteriorated.
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[0010]
Further, in the case of the unidirectional microphone unit shown in FIG. 3, as a result of the
presence of the acoustic mass such as the air chamber A secured by the air chamber cup 7,
parasitic resonance is generated to deteriorate the directional frequency response. There was
also a problem of
[0011]
SUMMARY OF THE INVENTION In view of the above problems of the prior art, the present
invention provides a sound passage capable of exerting a function equivalent to that of the rear
acoustic terminal hole without providing the rear acoustic terminal hole in the printed circuit
board. It is an object of the present invention to provide a unidirectional condenser microphone
unit that does not allow unwanted matters such as solder balls to enter into the unit case, in
addition to stabilization of the directional frequency response due to resonance and occurrence
avoidance.
[0012]
The present invention has been made to achieve the above object, and a unit case having a front
acoustic terminal hole and having a bottomed cylindrical shape, and a sealing side surface when
the unit case side is crimped. On the side surface, a plurality of ground-side pattern layers
extending radially from the central portion to the peripheral edge, and on the other side, the
substrate exposed surface is left from the central portion to the peripheral portion. Containing in
the unit case a printed circuit board provided with a plurality of input-side pattern layers
extending radially and a conductive sleeve in conductive contact with the input-side pattern layer
side of the printed circuit board And at least a part other than the flat washer and the groundside pattern layer when the printed circuit board having at least a flat washer interposed at the
periphery of the one side is crimped and sealed. The first void on the one side and the second
void on the other side, which are formed between the conductive sleeve and the base material
exposed surface, are formed in the peripheral portion of the printed circuit board. The most
important feature is that the sound passage consisting of a thin air layer communicated via the
one or more notched portions is provided with a function as a rear acoustic terminal.
[0013]
In this case, adjustment of the acoustic resistance generated by the sound passage may be
performed depending on the size of the inner diameter of the flat washer and the thickness of the
ground-side conductor pattern layer and the input-side pattern layer. .
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[0014]
According to the invention of claim 1, from the side of the printed circuit board, introducing the
sound wave into the unit case under the acoustic resistance generated by the sound passage
formed of the thin air layer formed instead of the rear acoustic terminal hole. As a result, it is
possible to prevent the entry of external electrical noise and effectively prevent the generation of
hum noise, and also to prevent the entry of unwanted matter such as solder balls into the unit
case.
[0015]
Moreover, since there is no air chamber or acoustic mass generating parasitic resonance in the
unit case, it is possible to obtain good directional frequency characteristics.
[0016]
According to the invention of claim 2, adjustment of the acoustic resistance generated by the
sound passage is performed by changing the inner diameter of the flat washer or changing the
layer thickness of the ground-side conductor pattern layer and the input-side pattern layer.
Therefore, fine adjustment can be made to obtain a desirable acoustic resistance value.
[0017]
FIG. 1 is an explanatory view of an example of the present invention, in which (a) shows a
longitudinal sectional view and (b) shows a bottom view corresponding to (a).
FIG. 2 is an explanatory view showing the positional relationship between the notch portion and
the print pattern in an example of the printed circuit board constituting the present invention,
and FIG. One side side which becomes a sealing surface like b), (b) shows the other side side
located in the opposite side, respectively.
[0018]
According to these figures, a unidirectional microphone unit (hereinafter, referred to as a
"microphone unit").
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11 is composed of a cylindrical unit case 12 with a bottom and a built-in unit 22 housed in the
unit case 12.
[0019]
Among them, the unit case 12 formed by using a conductive metal such as aluminum has a front
acoustic terminal hole 13a in the bottom portion 13 and curls the open end portion of the
opening portion 14 inward, as shown in FIG. A caulking portion 15 as shown in FIG. 1 (a) can be
formed.
[0020]
On the other hand, the built-in unit 22 is opposed to the diaphragm unit 23 with the diaphragm
unit 23 formed by stretching the diaphragm 23b inside the support ring 23a disposed facing the
front acoustic terminal hole 13a, and the spacer 24 The back electrode plate 25 disposed, the
insulating sleeve 26 disposed between the circumferential end surface 25 a of the back electrode
plate 25 and the inner circumferential surface 16 of the unit case 11, and the conductive
disposed inside the insulating sleeve 26 The printed circuit board 33 is disposed in the unit case
12 with the sleeve 27 and the insulating sleeve 26 in a state where the opposing peripheral edge
portion is in contact with and supported, and the interposed between the printed circuit board 33
and the caulking portion 15 And a flat washer 28 made of a conductive material.
[0021]
Among these, the printed circuit board 33 is not provided with the rear acoustic terminal hole,
and five notches 34 which are concavely curved at equal intervals are formed on the peripheral
edge 33 a side thereof.
[0022]
In addition, as shown in FIG. 2A, the annular pattern layer 36 provided in the vicinity of the
center of the printed circuit board 33 on the side surface 35 serving as a sealing surface when
the unit case 12 side is crimped. There are formed five relatively wide ground-side pattern layers
37 extending radially.
[0023]
Further, an annular pattern layer 46 is provided on the other side surface 45 of the printed
circuit board 33 in the vicinity of the center surrounding the impedance converter 45 a, leaving
the base material exposed surface 49 on the peripheral portion 48 from the annular pattern
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layer 46. Five relatively narrow input pattern layers 47 radially extending to the vicinity thereof
are formed, and each of the input pattern layers 47 is formed on the side of the conductive
sleeve 27 constituting the built-in unit 22. It will be in conductive contact.
[0024]
For this reason, when the printed circuit board 33 is crimped and sealed, as a result of the flat
washer 28 interposed in the peripheral portion 38 of the one side surface 35 and the ground
side pattern layer 37 being in conductive contact, the thickness of the ground side pattern layer
37 The first air gap 39 is formed in the peripheral portion 38 without the ground-side pattern
layer 37.
[0025]
When the printed circuit board 33 is crimped and sealed, although the conductive pattern 27 on
the input side pattern layer 47 of the other side 45 and the conductive sleeve 27 are in
conductive contact, an input is made between the base material exposed surface 49 of the
peripheral portion 48 The second air gap 50 corresponding to the thickness of the side pattern
layer 47 is formed.
[0026]
Moreover, since the printed circuit board 33 has the notch 34 on the side of the peripheral edge
33 a, the first gap 39 and the second gap 50 can be communicated through the notch 34.
That is, as a result of the first air gap 39 and the second air gap 50 being communicated through
the notch 34, the sound passage 61 consisting of a thin air layer can be secured, and the rear
acoustic terminal is formed in the sound passage 61. It will be possible to demonstrate its
function.
[0027]
Next, the operation and effects of the present invention having the above configuration will be
described based on the examples shown in FIGS. 1 and 2. In the unit case 12, the built-in unit 22
is accommodated and arranged according to a predetermined procedure.
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The printed circuit board 33 housed at the end is disposed so as to seal the opening 14 side of
the unit case 12, the flat washer 28 is placed on the peripheral portion 38 on the one side 35
side, and the opening is opened thereon The portion 14 side is turned inward to form a caulking
portion 15 by caulking.
[0028]
When the caulking portion 15 is formed by caulking the opening 14 side of the unit case 12 in
this manner, the printed circuit board 33 is pressed inward via the flat washer 28, as shown in
FIG. 1A. The other built-in units 22 except the flat washer 28 and the printed circuit board 33 are
also stably housed and held in the unit case 11 under the internal pressure generated at that
time.
[0029]
In this case, the printed circuit board 33 is provided with the notch 34 on the side of the
peripheral edge 33a, and the earth side pattern layer 37 radially arranged to reach the
peripheral edge 33a is reached to the one side 35 which is the sealing surface. It has the input
side pattern layer 47 radially arranged with the base material exposed surface 49 left on the
other side 45 of the back side.
[0030]
Therefore, when the entire built-in unit 22 is housed and held in the unit case 12 via the caulking
portion 15, the flat washer 28 and the earth side pattern interposed in the peripheral portion 38
of the one side surface 35 in the printed circuit board As a result of the conductive contact with
the layer 37, the first air gap 39 corresponding to the thickness of the ground side pattern layer
37 is formed in the peripheral portion 38 without the ground side wide pattern layer 37.
[0031]
Further, when the printed circuit board 33 is crimped and sealed, although the conductive
pattern 27 on the input side narrow pattern layer 47 of the other side surface 45 is in conductive
contact, it is between the substrate exposed surface 49 of the peripheral portion 48 thereof. In
this case, the second air gap 50 corresponding to the thickness of the input-side pattern layer 47
is formed.
[0032]
Moreover, since the notch 34 is formed on the side of the peripheral edge 33 a of the printed
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circuit board 33, the thin air layer is formed such that the first gap 39 and the second gap 50
communicate with each other through the notch 34. The sound passage 61 is to be formed.
[0033]
Therefore, the sound passage 61 can exhibit a function as a rear acoustic terminal for
introducing a sound wave from the outside into the unit case 12 and can also exhibit an acoustic
resistance function because it is a thin air layer. It will be possible to have it also.
[0034]
Therefore, according to the present invention, the microphone unit 11 can be formed using the
printed circuit board 33 which does not have the rear acoustic terminal hole, and the hum noise
that external electrical noise intrudes from the rear acoustic terminal hole. In addition, it is
possible to effectively prevent unwanted substances such as solder balls and dust from entering
the unit case 12.
[0035]
Moreover, since the microphone unit 11 can be formed without the presence of the air chamber
A and the acoustic mass as shown in FIG. 3, a good directional frequency response can be
obtained without generating parasitic resonance.
[0036]
Further, the microphone unit 11 increases or decreases the inner diameter of the flat washer 28
or adjusts the thickness of the ground pattern layer 37 and the input pattern layer 47 to make
the acoustic resistance function of the sound passage 61 desirable. It can also be formed by
adjusting to the most suitable one.
[0037]
The above has described the present invention based on the illustrated examples, and the specific
configuration thereof is not limited to this.
For example, the number and cutout surface sizes of the cutouts 34 provided in the printed
circuit board 33 can be set as desired.
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In addition, the arrangement number of the ground side pattern layer 37 and the input side
pattern layer 47 can be appropriately determined as desired.
Furthermore, in the illustrated example, the ground side pattern layer 37 is formed wider than
the input side pattern layer 47 from the viewpoint of enhancing the shielding effect, but the same
width may be formed if desired. You can also.
[0038]
BRIEF DESCRIPTION OF THE DRAWINGS It is explanatory drawing about an example of this
invention, (a) of them shows a longitudinal cross-sectional view, (b) shows the bottom view made
to correspond with (a), respectively.
It is explanatory drawing which shows the positional relationship of the notch part in an example
of the printed circuit board which comprises this invention, and a print pattern, When (a) of them
is crimped and attached like FIG.1 (b) (B) shows the other side which is located on the opposite
side of the one side which is the sealing side surface.
It is explanatory drawing which shows the prior art example of a unidirectional directivity
condenser microphone unit, (a) of them shows a longitudinal cross-sectional view, (b) shows the
top view of the printed circuit board shown by (a), respectively.
Explanation of sign
[0039]
11 Unidirectional Condenser Microphone Unit 12 Unit Case 13 Bottom 13a Front Acoustic
Terminal Hole 14 Opening 15 Caulking 16 Internal Area 22 Built-in Unit 23 Diaphragm 23a
Support Ring 23b Dia. 24 Spacer 25 Back Electrode 25a Peripheral end face 26 Insulating sleeve
27 Conductive sleeve 28 Flat washer 33 Printed circuit board 33a Peripheral part 34 Notched
part 35 One side 36 Annular pattern layer 37 Ground side pattern layer 38 Peripheral part 39
1st air gap 45 Other side 45a Impedance converter 46 Annular pattern layer 47 input side
pattern layer 48 peripheral portion 49 base material exposed surface 50 second air gap portion
61 sound passage
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