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JP2004356925

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DESCRIPTION JP2004356925
[PROBLEMS] To realize a structure in which a sound detected by a microphone present inside a
unit detects only a sound from a sound hole of a case by an inexpensive method. An upper
housing 119 and a lower housing are provided by internally including a microphone 116
mounted on a printed wiring board 115 and connecting the sound hole 118 of the upper housing
119 with a pipe-like structure 124. Sound leaking from the gap 123 at the junction with the body
120 or the gap between the connection line 121 and the through hole 122 to the inside of the
microphone unit is shielded, only the sound from the sound hole 118 is detected in the
microphone 116, and the frequency is very low. Even the sound of can be measured accurately.
[Selected figure] Figure 1
Microphone unit and mounting structure thereof
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
microphone unit using a microphone that detects sound and converts it as an electrical signal,
and a mounting structure thereof. A microphone detects sound and converts it into an electrical
signal. Generally, this microphone is mounted as a microphone unit on a printed circuit board
together with an electric circuit for amplifying the signal from the microphone, Furthermore, in
many cases, the printed wiring board is used as a microphone unit housed in a housing having a
sound hole. This is because if the electrical output from the microphone is small and this signal is
directly drawn out and connected to an external device, external electrical noise will enter the
connecting wire and the SN ratio can not be ensured, so amplification by the electrical circuit in
the vicinity of the microphone It is necessary to lead the signal to the outside after making it a
large signal. FIG. 5 shows a cross-sectional view of a general microphone unit 113 having such a
configuration. A printed wiring board 101 has a microphone 102 mounted thereon for detecting
sound. The printed wiring board 101 is additionally mounted with an electric component 103 for
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amplifying an electric signal from the microphone 102. The printed wiring board 101 is disposed
inside the space formed by the upper housing 105 and the lower housing 106 having sound
holes 104 for taking in sound, and is protected from external impact and the like, and these
housings 105 and 106 Mounted in place through Generally, the upper housing 105 and the
lower housing 106 are formed by pressing a resin molded product or metal. Reference numeral
107 denotes a connection line for drawing out the signal from the microphone unit 113 to the
outside and supplying a power for operating the internal electric circuit, and a through hole in
the printed wiring board 101 in this case in the upper housing 105. It is pulled out through the
hole 108. In the case of the microphone unit 113 having such a structure, the spatial connection
between the internal space of the upper and lower housings 105 and 106 where the microphone
102 is present and the exterior is centered on the sound hole 104 of the upper housing 105, but
the upper housing In reality, a slight gap is generated at the insertion portion between the
connection line 107 and the through hole 108 for passing the connection line 107 opened in the
fitting portion 109 of the lower housing 106 and the upper housing 105. There is also a slight
but spatial connection here. Further, the microphone unit is not mounted on the printed wiring
board, and the microphone is held inside an elastic folder such as rubber, and the elastic folder
holding the microphone is fixed to the external case having a sound hole. Is connected to the
printed circuit board.
As prior art document information related to the invention of this application, for example,
Patent Document 1 is known. [Patent Document 1] Patent No. 2960220 [0006] FIG. 6 shows the
sound of one of the two enclosed spaces separated by the partition plate, It is a schematic
diagram of the case which installs and detects the microphone unit 113 shown in FIG. 5 in one
space side. Reference numeral 110 denotes a partition plate, which creates two enclosed spaces
of a measured space 111 and a microphone unit installation side space 112. The microphone
unit 113 is installed in the microphone unit installation side space 112 so as to detect the sound
in the measurement space 111 via a sound hole 114 opened in the partition plate 110. When
such a case is considered, if the size of the enclosed space is sufficiently large compared to the
wavelength of the sound wave to be measured, the sound of the microphone unit installation side
space 112 in which the microphone unit 113 is disposed is as shown in FIG. The gap between the
insertion portion of the connection line 107 and the through hole 108 for passing the connection
line 107 opened in the fitting portion 109 of the upper case 105 and the lower case 106 of the
microphone unit 113 and the upper case 105 shown in FIG. The amount of leakage into the
interior surrounded by the upper and lower housings 105 and 106 where the microphone 102
exists is very small, and the sound of the measurement space 111 substantially passes through
the sound holes 114 of the partition plate 110. Then, only the sound pressure generated in the
microphone unit 113 is generated and no problem occurs. However, when measuring sound in a
region where the size of the enclosed space is equal to or less than the wavelength of the sound
wave to be measured, ie, very low frequency, a microphone unit in which the microphone unit
113 is installed The sound pressure of very low frequency of the installation side space 112 is
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opened in the fitting portion 109 of the upper case 105 and the lower case 106 of the
microphone unit shown in FIG. 5 and the upper case 105 based on the principle of Pascal. In the
inside surrounded by the upper and lower casings 105 and 106 in which the microphone 102
exists through the gap of the insertion portion between the through hole 108 for connecting the
connection line 107 and the connection line 107, the microphone unit installation side space
112 Sound pressure and sound pressure are generated inside the housing of the microphone unit
113. Therefore, at a very low frequency, there is a problem that even the sound of the space to
be measured 111 that should originally detect the sound of the space to be measured 111 is
detected.
Such a case occurs, for example, when detecting a sound on the cabin side near the rear tray of
the vehicle. The vehicle is divided into two sealed spaces of a vehicle compartment and a trunk
by a rear tray, and the microphone unit may have to be installed on the trunk side due to the
design of the vehicle compartment. In addition, the microphone unit shown in the prior art is not
mounted on the printed wiring board, and the microphone is held inside an elastic folder such as
rubber, and the elastic folder holding the microphone is an external case having a sound hole. In
this case, the elastic folder is in intimate contact with a housing having a sound hole, although
there is a structure in which the output line of the microphone is connected to the printed wiring
board. No sound leakage occurs, but the microphone is not mounted on the printed circuit board,
and the output line from the microphone must be soldered later or the elastic folder and the
microphone are strictly formed by a method such as integral molding There are problems such
as cost increase to eliminate the leak. In the present invention, as shown in FIG. 5, it is possible to
realize the structure in which the sound detected by the microphone present inside the
microphone unit is only the sound from the sound hole of the upper case by an inexpensive
method. With the goal. Means for Solving the Problems In order to achieve the above object, the
present invention has the following constitution. According to a first aspect of the present
invention, there is provided a printed wiring board, a microphone mounted on the printed wiring
board, and a case having the printed wiring board and a sound hole for taking in sound. And a
microphone mounted inside the printed wiring board inside, and the printed wiring board and
the sound hole of the housing are connected by a pipe-like structure, which has a very low
frequency. Also in the detection of sound, only the sound through the sound hole of the housing
can be detected accurately. According to a second aspect of the present invention, there is
provided a printed wiring board, a microphone mounted on the printed wiring board, a housing
having the printed wiring board and a sound hole for taking in sound. A structure in which a
microphone mounted on the printed wiring board is included inside and a pipe-like structure in
which one end face is joined with a flexible material between the printed wiring board and the
sound hole of the housing Even when the dimensional accuracy of the hollow cylindrical
structure is not very high, good connection is possible, and only the sound through the sound
hole of the case is accurately detected even in the detection of very low frequency sound. Has the
effect of being detectable.
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The invention according to claim 3 of the present invention is an invention of a structure for
practically attaching the microphone unit according to claims 1 and 2 of the present invention to
a plate-like structure, and a printed wiring board, A microphone mounted on the printed wiring
board, a case having the printed wiring board housed therein and having a sound hole for taking
in sound, and the microphone mounted on the printed wiring board inside the printed wiring
board The microphone unit having a structure in which the first pipe-like structure is connected
to the sound hole of the housing is a sound of each sound on one surface of the plate-like
structure having the sound hole to which the microphone unit is to be attached. A decorative
plate with holes and sound holes is likewise provided on the other side of the plate-like structure
to which the microphone unit is to be attached. By arranging the sound holes together and
connecting the sound holes of the microphone unit and the sound holes of the decorative plate
with a second pipe-like structure, the sound of the decorative plate can be accurately obtained
even with a very low frequency sound. It has the effect that only the sound through the sound
hole can be detected. BEST MODE FOR CARRYING OUT THE INVENTION First Embodiment The
first embodiment of the present invention will be used to explain the invention described in the
first aspect of the present invention. FIG. 1 is a structural cross-sectional view of a microphone
unit according to a first embodiment of the present invention. Reference numeral 115 denotes a
printed wiring board, and reference numeral 116 denotes a microphone mounted on the printed
wiring board 115. Similarly, 117 is a simplified representation of the electronic components
mounted on the printed wiring board 115 and amplifies the signal of the microphone 116.
Reference numeral 119 denotes an upper housing having a sound hole 118, and reference
numeral 120 denotes a lower housing. A printed wiring board 115 is disposed in an internal
space formed by the upper housing 119 and the lower housing 120. Reference numeral 121
denotes a connection line connected to the printed circuit board 115 for drawing out a signal to
the outside or supplying power, and drawn out through the through hole 122 of the upper
housing 119. Reference numeral 123 denotes a gap between the junctions of the upper housing
119 and the lower housing 120. Reference numeral 124 denotes a pipe-like structure including a
sound hole 118 opened in the upper housing 119 and a microphone 116 inside and connecting
the upper housing 119 and the printed wiring board 115. With this structure, the microphone
116 is connected to the external space only through the sound hole 118 opened in the upper
housing 119 through the inside of the pipe-like structure 124, and the upper housing 119 There
is no influence of the sound from the gap 123 between the joint of the lower housing 120 and
the through hole 122 of the upper housing 119 and the connection line 121, and the sound hole
118 precisely opened in the upper housing 119 by the microphone 116. Only the sound from
can be detected.
Second Embodiment The invention according to the second aspect of the present invention will
be described below with reference to a second embodiment. FIG. 2 shows a cross-sectional view
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of a microphone unit according to a second embodiment of the present invention. 125 is a
printed wiring board, 126 is a microphone mounted on the printed wiring board 125. Reference
numeral 127 is a simplified representation of the electronic components mounted on the printed
wiring board 125, and amplifies the signal of the microphone 126. 129 is an upper case having a
sound hole 128, and 130 is a lower case. A printed wiring board 125 is disposed in an internal
space formed by the upper housing 129 and the lower housing 130. A connection line 131 is
connected to the printed circuit board 125 for drawing a signal to the outside or for supplying
power, and is a connection line drawn to the outside through the through hole 132 of the upper
housing 129. Reference numeral 133 denotes a gap between the joint portion of the upper
housing 129 and the lower housing 130. Reference numeral 134a denotes a main body of a pipelike structure 134 including a sound hole 128 and a microphone 126 opened in the upper
housing 129 and connecting the upper housing 129 and the printed wiring board 125, and this
portion is structurally It is made of hard material. 134b is a tip made of a structurally flexible
material joined to the upper end of the body portion 134a of the pipe-like structure 134; The
main body portion 134a and the tip end portion 134b form a pipe-like structure 134 for
connecting the upper housing 129 and the printed wiring board 125. Also in this case, the sound
detected by the microphone 126 is only from the sound hole 128 opened in the upper housing
129 as in the first embodiment, but in the case of the first embodiment The dimensions of the
pipe-like structure 124 connecting the upper housing 119 and the printed wiring board 115 in
FIG. 1 must be precisely matched to the dimensions between the upper housing 119 and the
printed wiring board 115 to ensure connection. . Therefore, it is necessary to make the
dimensional accuracy of each part of the microphone unit extremely high, but in the case of the
second embodiment, the pipe-like structure 134 connecting the upper housing 129 and the
printed wiring board 125 of FIG. The pipe-like structure 134 has a dimension larger than that
between the upper housing 129 and the printed wiring board 125, and comprises a body portion
134a and a tip portion 134b composed of a flexible material. By compressing the portion of the
pipe-like structure 134 made of the flexible material, strict bonding can be performed, and there
is an advantage that it is not necessary to increase the dimensional accuracy of each part of the
microphone unit.
Third Embodiment The invention according to the third aspect of the present invention will be
described below with reference to the third embodiment. FIG. 3 is a cross-sectional view of the
mounting structure of the microphone unit according to the third embodiment of the present
invention. Reference numeral 136 denotes the microphone unit shown in FIG. 1 provided with
the first pipe-like structure 124, and reference numeral 118 denotes a sound hole of the
microphone unit 136. Reference numeral 138 denotes a plate-like structure to which the
microphone unit 136 is to be attached, and the sound hole 139 is opened. A plate-like decorative
plate 140 is disposed on the opposite side of the plate-like structure 138 where the microphone
unit 136 is disposed, and the sound hole 141 is similarly opened. As can be seen from FIG. 3, the
sound holes 118 of the microphone unit 136, the sound holes 139 of the plate-like structure
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plate 138, and the sound holes 141 of the decorative plate 140 are disposed on a straight line. A
second pipe-like structure 142 is connected to the decorative plate 140 and the upper surface of
the microphone unit 136 so as to include the respective sound holes 141 and 139 therein.
Reference numeral 143 denotes a gap generated between the microphone unit 136 and the
plate-like structure 138, and if there is no second pipe-like structure 142, the sound on the
microphone unit 136 side passes through the gap 143 into the microphone unit 136. It seems
that you can easily understand that getting into As described above, by taking the abovedescribed mounting structure, it is possible to accurately detect only the sound in the targeted
space even when actual mounting of the microphone unit is considered. Next, specific examples
of the present invention will be described. FIG. 4 shows an embodiment of the present invention
when attached to a partition plate provided at the boundary of two enclosed spaces and detecting
only the sound of one of the spaces. Reference numeral 144 denotes a partition plate provided at
the boundary of the enclosed space, which is divided into two enclosed spaces of a sound
measurement space 145 and a space 146 in which the microphone unit 147 is disposed. The
microphone unit 147 is installed in the internal space formed by the upper housing 151 and the
lower housing 153 having the sound hole 152 and the microphone 149 and the electric
component 150 mounted on the printed wiring board 148. The upper case 151 and the printed
wiring board 148 are connected by a first pipe-shaped structure 159 so as to include the opened
sound hole 152 and the microphone 149 inside.
Reference numeral 154 denotes a connection line drawn from the printed wiring board 148 to
the outside through the through hole 155 opened in the upper housing 151. A decorative plate
160 is disposed on the side of the space to be measured 145, and has a sound hole 161 at the
center. The decorative plate 160 has a second pipe-like structure 162 on the microphone unit
147 side including the sound hole 161 on the inside, and the mounting boss 163 and the
microphone similarly provided on the decorative plate 160 By tightening the lower housing 153
of the unit 147 with the screw 164, the pipe-like structure 162 includes the upper housing 151
of the microphone unit 147 and the sound hole 152 opened in the upper housing 151 inside. It
is designed to be closely linked. At this time, considering the route where the sound of the space
146 where the microphone unit 147 is disposed reaches the microphone 149 of the microphone
unit 147, the fitting portion of the upper case 151 and the lower case 153 of the microphone
unit 147 is The sound enters the inside of the microphone unit 147 through the gap 156, the
connection line 154 and the gap 157 of the through hole 155, but the sound is detected by the
microphone 149 because the sound is blocked by the first pipe-shaped structure 159. I will not.
On the other hand, the sound from the gap 158 between the upper case 151 of the microphone
unit 147 and the partition plate 144 is also the second pipe structure 162 provided on the
decorative plate 160 and the upper case 151 of the microphone unit 147. Because of their close
coupling, they are not detected by the microphone 149. Therefore, the sound in the space 146
where the microphone unit 147 is installed is not detected at all, and only the sound in the
measured space 145 is the sound hole 161 of the decorative plate 160 and the sound hole 152
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of the upper case 151 of the microphone unit 147. And reach the microphone 149 to be
detected. As described above, according to the present invention, there is no need to install a
microphone unit inside the measured enclosed space in order to accurately detect low frequency
sound of only the enclosed space, Even if the microphone unit is installed outside the measured
sealed space, the low frequency sound of only the measured sealed space can be accurately
detected, and the advantageous effect that it can be used even in a place with large design
restrictions can be obtained. . BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a structural
cross-sectional view of a microphone unit according to a first embodiment of the present
invention. FIG. 2 is a structural cross-sectional view of a microphone unit according to a second
embodiment of the present invention. FIG. 4 is a cross-sectional view of an example of the
mounting structure of the microphone unit according to the third embodiment of the present
invention. FIG. 5 is a cross-sectional view of a conventional microphonite. Schematic illustration
of the mounting structure when using phononite [Description of the code] 115, 125, 148 Printed
wiring board 116, 126, 149 Microphone 117, 127, 150 Electric parts 118, 128, 139, 141, 152,
161 Sound Holes 119, 129, 151 Upper case 120, 130, 153 Lower case 121, 131, 154
Connection line 122 , 132, 155 through holes 123, 133, 143, 156, 157, 158 Gap 144 Partition
plate 145 Measurement space 146 Microphone unit installation space 136, 147 Microphone unit
124, 134, 142, 159, 162 Pipe-shaped structure 138 Plate-like structure 140, 160 Face plate 163
Mounting boss 164 screw
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