JP2013098737A - Microphone device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a microphone device which is low in height and prevents collection of sound other than collection target sound.SOLUTION: The microphone device includes a floater 3 having a slit 5 for amplifier substrate insertion and a projection 3S for sound leakage prevention, and an amplifier substrate 6 having a land 31 for sealing. The amplifier substrate 6 is vertically installed to a floater sound hole 14, and a width S1 of the slit for amplifier substrate insertion of the floater 3 is set small relative to a thickness T1 of the amplifier substrate 6.

Description

  The present invention relates to a microphone device, and more particularly to a seal structure in a vehicle-mounted microphone device including a microphone element and an amplifier circuit board.

In recent years, a microphone has been installed in a vehicle for voice recognition or for answering a telephone while traveling.
In that case, it is required not to collect sounds other than the target sound such as road noise.
For example, sound generated from a direction other than the floater hole for collecting the target sound, for example, road noise propagating from the gap in the housing, is generated in the space between the floater hole for collecting the target sound and the microphone element. When entering a certain front air chamber and back air chamber, road noise enters the microphone element. Therefore, various seal structures including an electromagnetic shield (Patent Document 1) have been proposed in order to prevent road noise from propagating from the gap between the casings.

As an example of a conventional microphone device, there is one in which a housing 104 is constituted by a case 104a and a cover 104b as shown in FIG. In this microphone device, an anti-vibration component made of a soft material called a floater 103 and a front air chamber and a back air chamber component are mounted inside the housing 104, and the microphone element 101 is fixed. The amplifier board 106 is fixed by a floater 103 and a case 104a. In this structure, when there is a gap between the case 104a and the cover 104b, sound other than the sound collection target such as road noise that propagates through the gap is generated between the floater hole 114 and the microphone element 101 for collecting the target sound. When the front air chamber 111 and the back air chamber 112, which are spaces between them, enter the microphone element 101, sound other than the sound collection target enters. The external output harness is installed from the harness land on the amplifier board 106 to the outside of the case 104a and the cover 104b, and has a function of outputting a signal to a subsequent device. The external output harness, the case 104a, and the cover If there is a gap between 104b, sound other than the sound collection target enters the microphone element 101 as well.
Therefore, in order to collect only the sound to be collected, a structure that seals the area other than the floater sound hole 114 in the floater 103 is required.
In addition, as the mounting area of the microphone device is lowered, the microphone itself is required to be thinner.

The microphone device includes a microphone element 101, a floater 103 for constructing a front air chamber and a back air chamber for vibration isolation, an amplifier substrate 106 for amplifying and impedance matching a signal from the microphone element 101, and a circuit forming circuit. The mounting component 107, the lead wire 102 for transmitting the signal of the microphone element 101 to the amplifier substrate 106, the case 104a that constitutes the casing 104, and the cover 104b. The amplifier substrate 106 has a surface on which the floater sound hole 114 is formed. Are arranged in parallel.
The sound to be collected is input from the floater sound hole 114 to the microphone element 101 via the front air chamber 111 and the back air chamber 112, converted into an electric signal, and input to the amplifier substrate 106 via the lead wire 102. . After amplification and impedance matching are performed on the amplifier substrate 106, the signal is output from the signal output harness 108. Reference numeral 113 denotes a dustproof non-woven fabric attached to the floater sound hole 114.

JP 2005-333183 A

In order to meet the demand for higher functionality of the microphone device, a multilayer board or a high-profile mounting component is used, and the total height of the microphone device is increased by the thickness of the high-performance amplifier board 106 and the mounting component 109. In this case, it is difficult to reduce the height of the microphone device.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a highly reliable microphone device that can be reduced in thickness and height.

  In order to solve the above-described problems, a microphone device of the present invention includes a housing having a sound hole, a floater that is housed in the housing so as to surround the sound hole, and has a slit for inserting an amplifier board, and the sound device. A microphone element supported by the floater and an amplifier board connected to the output of the microphone element so that the sound collection portion faces the hole; and the amplifier board is connected to the sound hole of the floater. The slit is mounted so as to be perpendicular to the slit.

  Further, the present invention includes the microphone device, wherein the floater has a sound leakage prevention protrusion protruding from the slit toward a corner of the amplifier board.

  Further, the present invention is the above microphone device, wherein the housing includes a case and a cover that matches the case, and the sound leakage prevention protrusion of the floater is pressed by the cover, and the cover And those that are closely fixed.

  Further, the present invention is the above microphone device, wherein the width of the slit for inserting the amplifier board of the floater is set smaller than the thickness of the amplifier board, and the outer shape of the floater is larger than the inner shape of the case. The outside dimensions of the floater including a protrusion that is formed small and includes the sound leakage prevention protrusion are set larger than the inside diameter of the case.

  As described above, according to the present invention, the amplifier board is configured to be installed vertically with respect to the floater sound hole, and the height does not increase due to the mounting components mounted on the amplifier board. . Therefore, in this structure, the thickness of the amplifier board and the mounted component does not affect the total height of the microphone, and it is possible to reduce the height of the microphone while preventing sound collection other than the sound to be collected. .

Sectional drawing of the microphone apparatus of Embodiment 1 of this invention 1 is a top view of a microphone device according to a first embodiment of the present invention. 1 is a top view showing a floater of a microphone device according to a first embodiment of the present invention. It is a figure which shows the principal part of the microphone apparatus of Embodiment 1 of this invention, (a) is a perspective view which shows a microphone element, (b) is a perspective view which shows an amplifier board, (c) is a perspective view which shows a floater. , (D) and (e) are AA sectional view and BB sectional view of (c). The principal part expansion perspective view which shows the microphone element of the microphone apparatus of Embodiment 1 of this invention. (A) And (b) is explanatory drawing which shows the protrusion structure for sound leak prevention in the microphone apparatus of Embodiment 1 of this invention. The figure which shows the amplifier board | substrate in the microphone apparatus of Embodiment 1 of this invention. Sectional drawing of the microphone apparatus of Embodiment 2 of this invention Sectional drawing which shows the microphone apparatus of a prior art example

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  1 and 2 are a cross-sectional view and a top view of the microphone device according to Embodiment 1 of the present invention. FIG. 3 is a top view showing a floater of the microphone device. 4A and 4B are diagrams showing the microphone device, wherein FIG. 4A is a perspective view showing a microphone element, FIG. 4B is a perspective view showing an amplifier board, FIG. 4C is a perspective view showing a floater, and FIG. c) AA sectional view, (e) is a BB sectional view of (c). FIG. 5 is an enlarged perspective view of a main part showing a microphone element of the microphone device. FIGS. 6A and 6B are explanatory views showing a sound leakage preventing protrusion structure in the microphone device. FIG. 7 is a diagram showing an amplifier board in the microphone device. Moreover, about the material etc. which are used by this invention, only the preferable example is illustrated and it is not limited to this form. In addition, changes can be made as appropriate without departing from the scope of the technical idea of the present invention. Furthermore, combinations with other embodiments are possible. In the present embodiment, a cylindrical microphone element is shown as the microphone element. However, a shape other than a cylinder is possible as long as the sealing between the floater and the microphone element is maintained. is there.

  As shown in FIGS. 1 and 2, in the microphone device of the present invention, the microphone element 1 is connected to the amplifier substrate 6 via the lead wire 2. In addition, the microphone element 1, the circuit board mounting component 7, and the amplifier board 6 having the signal output harness 8 for signal output are incorporated in the floater 3 made of a soft material, and the case 4a. Has been inserted. A filter 15 is attached to the microphone element 1. When the case 4a and the cover 4b are fitted, the floater 3, the microphone element 1, and the amplifier substrate 6 as a holder are enclosed in the case 4a and the cover 4b. At this time, the amplifier board 6 is installed perpendicular to the surface of the floater sound hole 14. Note that the lead wire 2 is not limited to a lead wire as long as it is a connection component that allows signal connection between the microphone element 1 and the amplifier substrate 6.

In the microphone device according to the present embodiment, as shown in FIGS. 1 and 2, the floater 3 is housed in close contact with the housing 4 having the sound hole h and is made of a soft material. The floater sound hole 14 of the floater 3 opens toward the sound hole h of the housing 4. The housing 4 includes a case 4a and a cover 4b that matches the case 4a. As shown in a top view in FIG. 3 and a perspective view in FIG. 4 (c), the floater 3 is provided with a slit 5 for inserting an amplifier substrate 6. And the amplifier board 6 which amplifies the output signal of the microphone element 1 is mounted so as to be perpendicular to the floater sound hole 14 of the floater 3.
As shown in FIGS. 6A and 6B, the floater 3 has a sound leakage prevention protrusion 3 </ b> S protruding from the slit 5 for inserting the amplifier board 6 toward the corner of the amplifier board 6. The sound leakage preventing projection 3S is deformed by being pressed toward the amplifier board 6 and the cover 4b, and closes the gap between the amplifier board 6 and the case 4a and the cover 4b. Thus, when the cover 4b is fitted to the case 4a, the sound leakage preventing projection 3S of the floater 3 is pressed, and the case 4a, the cover 4b, and the floater 3 are tightly fixed.

  4A to 4E show the floater 3 and its peripheral members. (A) is a perspective view which shows the microphone element 1, (b) is a perspective view which shows the amplifier board | substrate 6, (c) thru | or (e) are figures which show a floater. 4, (c) is a perspective view, and (d) and (e) are an AA sectional view and a BB sectional view of FIG. 4 (c). The amplifier board insertion slit 5 is set to be smaller than the thickness of the amplifier board 6, and the outer shape of the floater 3 is set to be smaller than the inner shapes of the case 4 a and the cover 4 b. However, when inserted into the case 4a and the cover 4b, the amplifier substrate insertion slit 5 and the sealing land 31 are in close contact with each other. The floater 3 has a hole H0 for holding the microphone element 1, and the outer peripheral surface of the microphone element 1 is held by the hole H0. At the end, as shown in FIG. 4 (d), a hole H1 with a small hole diameter is formed, and the microphone element 1 is fixed. FIG. 5 is an enlarged perspective view of a main part showing the microphone element 1, which is solder-connected to the lead wire 2 by a land 1S on the surface.

  In addition, the outer dimensions of the floater 3 including the sound leakage prevention protrusion 3S are set larger than the inner diameter dimension of the case 4a, and when the floater 3 and the amplifier board 6 are inserted into the case 4a and the cover 4b, the sound By crushing the leakage prevention protrusion 3S, a gap existing in the slit corner portion for inserting the amplifier substrate is filled, and the slit corner portion for inserting the amplifier substrate is sealed. 6A shows a state before the floater 3 having the sound leakage prevention protrusion 3S is pressed by the cover 4b, and FIG. 6B shows a state after the pressure of the floater 3 having the sound leakage prevention protrusion 3S. (See FIG. 4A). The sound leakage prevention projection 3S is formed so as to form a line on the surface facing the cover 4b, but may be formed along the entire circumferential surface. A plurality of them may be arranged in parallel.

  Furthermore, as shown in FIG. 7, the sealing land 31 on the amplifier substrate 6 is formed so as to leave the harness land 33. The sealing land 31 on the amplifier board 6 is in close contact with the amplifier board insertion slit 5 formed in the floater 3. Further, the mounting component 7 does not exist on the sealing land 31.

  Further, the harness land 33 on the amplifier substrate 6 is installed on the opposite side of the lead land 32 with respect to the sealing land 31. With this configuration, even if there is unevenness due to the harness, the gap does not cause sound leakage in the acoustic space including the microphone element 1. Note that these land shapes are not limited to these shapes, and can be appropriately modified.

  The present invention realizes a structure in which the total height of the microphone is not affected by the thickness of the amplifier substrate 6 and the thickness of the mounting component 7 and also has a floater sound hole in the floater 3 for collecting only the sound to be collected. A structure that seals areas other than 14 is achieved.

  As described above, the float 3 having the slit 5 for inserting the amplifier board and the projection 3S for preventing sound leakage, and the sealing land 31 and the sealing land 31 are installed on the opposite side of the lead land 32. And the amplifier board 6 provided with the harness lands 33, and the amplifier board 6 is installed vertically with respect to the floater sound hole 14. Note that the mounting component 7 does not exist on the ceiling land. In this structure, the thicknesses of the amplifier substrate 6 and the mounting component 7 do not affect the total height of the microphone device.

In the present invention, the width T2 of the amplifier substrate insertion slit 5 of the floater 3 is set smaller than the thickness T1 of the amplifier substrate 6, so that the amplifier substrate 6 and the amplifier substrate insertion slit 5 of the floater 3 The contact surface can be kept sealed.
6A, the corner of the slit 5 for inserting the amplifier board of the floater 3 cannot be sealed by setting the width of the slit 5 for inserting the amplifier board. 6 (b), a sound leakage prevention protrusion 3S is installed at the slit corner, and the sound leakage prevention protrusion 3S is crushed by the cover 4b. The five corners can be sealed.
As a result, even if a sound other than the sound to be collected is generated on the cover side, the sound other than the sound to be collected from between the amplifier board 6 and the slit 5 for inserting the amplifier board of the floater 3 The front air chamber 11 and the back air chamber 12 do not enter.

  As described above, according to the microphone device of the present invention, it is possible to prevent sound collection other than sound collection target sound, and it is possible to provide a thin microphone.

  In the above embodiment, the floater is formed so as to have the sound leakage prevention protrusion protruding from the amplifier board insertion slit toward the corner of the amplifier board. In addition, by using a floater material that is soft or highly elastic, sufficient adhesion to the case or the cover can be obtained.

  In the above embodiment, the width S1 (see FIG. 4) of the slit for inserting the amplifier board of the floater is set smaller than the amplifier board thickness T1 (see FIG. 4), and ) The width T2 (see FIG. 3) is smaller than the inner diameter S2 (see FIG. 2) of the case 4a, and the outer dimensions of the floater 3 including the sound leakage prevention protrusion are set larger than the inner diameter of the case. Has been. Even in the case where these conditions are not satisfied, there may be a case where sufficient adhesion to the case or the cover can be obtained by using a floater material having high flexibility or elasticity.

(Embodiment 2)
In the above-described embodiment, the housing 4 is configured as a two-part structure of the case 4a and the cover 4b. However, as shown in FIG. In this case, a floater 3 equipped with the microphone element 1 and the amplifier substrate 6 is prepared, and this floater is press-fitted into the housing 4 from the floater sound hole 14 side on the back surface. Finally, a locking member 10 that locks the floater 3 is attached to the opening on the back surface of the housing 4. The same as the first embodiment except that the housing is integrally formed.
Also in the present embodiment, the slit 5 is formed in the floater 3, the amplifier board 6 is mounted in the slit 5, and the mounting component 7 is mounted in the same manner as in the first embodiment.

  The floater is not particularly limited as long as it is a soft material. In the first and second embodiments, ethylene-propylene rubber or the like is used as the soft material constituting the floater. There are two types of ethylene / propylene rubbers: EPM (EPR), which is a copolymer of ethylene and propylene, and EPDM (EPT), which is a terpolymer containing a small amount of a third component. In general, EPM is used for industrial rubber products due to peroxide cross-linking materials, but now it acts as an impact modifier by adding it to general-purpose resins such as polypropylene. A high-quality floater material can be obtained. On the other hand, since the specific gravity is small, it is effective for weight reduction.

  The case 4a and the cover 4b may be made conductive by adding this conductive resin. Further, by giving elasticity to the floater 3, the floater 3 elastically contacts the amplifier board 6 made of a circuit board in the case 4 a and the cover 4 b (housing 4), fixes the amplifier board 6, and a contact portion Thus, the electrical connection with the GND pattern on the amplifier board 6 is realized.

  As described above, according to the microphone device of the present invention, the amplifier substrate is installed vertically with respect to the floater sound hole, and the thickness of the amplifier substrate and the mounted component is equal to the total height of the microphone. It is possible to reduce the height of the microphone device without affecting it.

DESCRIPTION OF SYMBOLS 1 Microphone element 2 Lead wire 3 Floater 3S Sound leakage prevention protrusion 4 Case h Sound hole 4a Case 4b Cover 5 Amplifier board insertion slit 6 Amplifier board 7 Mounting component 8 Signal output harness 10 for signal output Locking member 11 front air chamber 12 back air chamber 14 floater sound hole 15 filter S1 slit width T1 amplifier board thickness S2 inner case T2 floater outer shape 31 sealing land 32 lead land 33 harness land 101 microphone element 102 lead wire 103 floater 104 Housing 104a Case 104b Cover 106 Amplifier board 111 The chamber 112 The back air chamber 114 The floater sound hole

Claims (4)

A housing with sound holes;
A floater housed in the housing so as to surround the sound hole, and having a slit for inserting an amplifier board;
A microphone element supported by the floater such that the sound collection portion faces the sound hole;
An amplifier board connected to the output of the microphone element;
The microphone device mounted on the slit so that the amplifier substrate is perpendicular to the sound hole of the floater. The microphone device according to claim 1,
The floater has a sound leakage prevention protrusion protruding from the slit toward a corner of the amplifier board. The microphone device according to claim 1 or 2,
The housing includes a case and a cover that matches the case,
A microphone device in which the sound leakage prevention protrusion of the floater is pressed by the cover and is closely fixed to the cover. The microphone device according to any one of claims 1 to 3,
The width of the slit for inserting the amplifier board of the floater is set smaller than the thickness of the amplifier board,
And the external shape of the floater is formed smaller than the internal shape of the case,
In addition, a microphone device in which an outer dimension of the floater including a projection for preventing sound leakage is set larger than an inner diameter dimension of the case.

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