JP2009055490A - Microphone apparatus - Google Patents

Microphone apparatus Download PDF

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Publication number
JP2009055490A
JP2009055490A JP2007221973A JP2007221973A JP2009055490A JP 2009055490 A JP2009055490 A JP 2009055490A JP 2007221973 A JP2007221973 A JP 2007221973A JP 2007221973 A JP2007221973 A JP 2007221973A JP 2009055490 A JP2009055490 A JP 2009055490A
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Prior art keywords
sound
opening
film member
microphone device
element
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Pending
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JP2007221973A
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Japanese (ja)
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JP2009055490A5 (en
Inventor
Masafumi Iida
雅史 飯田
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Rohm Co Ltd
ローム株式会社
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Priority to JP2007221973A priority Critical patent/JP2009055490A/en
Publication of JP2009055490A publication Critical patent/JP2009055490A/en
Publication of JP2009055490A5 publication Critical patent/JP2009055490A5/ja
Application status is Pending legal-status Critical

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Abstract

<P>PROBLEM TO BE SOLVED: To provide a microphone apparatus which can suppress deterioration in reliability. <P>SOLUTION: The microphone apparatus 100 is equipped with a substrate 30; a casing section 40 provided on the substrate 30 and forming a spatial portion 43 with the substrate 30; and a sound-collecting element 10 disposed in the spatial portion 43 for collecting sounds from the outside and converting them into electrical signals. The housing section 40 (a lid 42) includes an opening 42a for taking sound pressure into the spatial portion 43 and on a lower surface of the housing section 40 (the lid 42), a film member 46 is provided for closing the opening 42a. Furthermore, the sound-collecting element 10 includes a vibrating membrane 2, which receives sound pressure and vibrates, and is disposed on the substrate 30 so as to position the opening 42a directly above the vibrating film 2. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a microphone device provided with a sound collection element.

  Conventionally, a microphone device including a sound collection element is known (for example, see Patent Document 1).

  In Patent Document 1, a silicon microphone package (microphone device) in which a silicon microphone chip (sound pickup element) formed using a semiconductor process technology is housed inside a package constituted by a printed circuit board and a casing. ) Is described. In this silicon microphone package, a sound receiving opening is formed in a casing constituting the package. For this reason, since the sound (sound pressure) from the outside is taken into the casing through this opening, the sound outside the silicon microphone package is efficiently collected by the silicon microphone chip housed inside the casing. It becomes possible to do.

JP 2007-60285 A

  However, in the conventional silicon microphone package (microphone device) described in Patent Document 1, the sound collection efficiency by the silicon microphone chip (sound collecting element) is improved by forming a sound receiving opening in the casing. However, there is an inconvenience that foreign matter, dust, or the like enters the inside of the package through the opening formed in the casing. On the other hand, the silicon microphone chip (sound pickup element) mounted on the silicon microphone package described in Patent Document 1 is very fine and easily damaged because it is finely processed using semiconductor process technology. For this reason, when a foreign substance, dust, etc. enter the inside of a package, there is a problem that the silicon microphone chip (sound collecting element) is immediately damaged. As a result, the conventional silicon microphone package (microphone device) has a problem that the reliability of the product is lowered.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a microphone device capable of suppressing a decrease in reliability.

  In order to achieve the above object, a microphone device according to one aspect of the present invention includes a base portion, a casing portion that is provided on the base portion and forms a space portion together with the base portion, and is disposed in the space portion. And a sound collection element that collects sound from the outside and converts it into an electrical signal. And the housing | casing part has an opening part for taking in sound pressure in a space part, and the film member which plugs up at least one part of an opening part is provided on the surface in which the opening part of the housing | casing part is formed. It has been.

  In the microphone device according to the one aspect, as described above, the sound pressure is taken in by providing a film member on the surface of the housing portion on which the opening is formed so as to block at least a part of the opening. Even if the opening for providing is provided in the housing, it is possible to suppress the entry of foreign matter, dust, or the like into the space where the sound collection element is disposed from the opening. For this reason, since it can suppress that the inconvenience that a sound collection element breaks resulting from a foreign material, dust, etc. invading into a space part can reduce a reliability fall.

  Further, in the microphone device according to one aspect, as described above, even if the opening is blocked by the film member so as to prevent foreign matter or dust from entering the space, A decrease in sound collection efficiency due to the sound element can be suppressed. That is, when the opening is closed by the film member, the opening portion of the film member vibrates due to the sound pressure from the outside, so that the sound pressure from the outside is transmitted to the space by the vibration. For this reason, even if the opening is closed, the sound pressure is taken into the space in which the sound collection element is arranged, so that a decrease in sound collection efficiency by the sound collection element is suppressed.

  In the above-described configuration, the film member is provided on the surface of the housing portion where the opening is formed. Therefore, even when the thickness of the film member is reduced, the film member is easily closed so as to close the opening. It can be provided in the housing. For this reason, by reducing the thickness of the film member, it is possible to easily transmit the sound pressure from the outside to the space portion, so that the sound from the outside can be suppressed while suppressing the entry of foreign matter or dust into the space portion. (Sound pressure) can be collected efficiently by the sound collection element.

  In the microphone device according to the above aspect, preferably, the film member is attached on the surface of the housing portion so as to close all the openings. If comprised in this way, since it can suppress effectively that a foreign material, a dust, etc. penetrate | invade into the space part in which the sound collection element is arrange | positioned, the fall of reliability can be suppressed easily. Note that when the space is sealed by closing all of the openings, entry of moisture and the like into the space can be suppressed, so that a microphone device with excellent water resistance can be obtained. In addition, by using an opaque film member or the like to block light from entering the space, a microphone device with excellent light resistance can be obtained.

  In the microphone device according to the above aspect, the sound collection element preferably has a diaphragm that vibrates by receiving sound pressure, and is disposed in a region where the opening and the diaphragm overlap when viewed in a plan view. With this configuration, since the diaphragm of the sound collection element can be brought close to the opening, even if the opening is closed with a film member, the sound (sound pressure) from the outside can be collected more efficiently by the sound collection element. Can sound. Thereby, the fall of the sound collection efficiency by a sound collection element can be suppressed easily, suppressing the fall of reliability.

  In this case, preferably, the diaphragm of the sound collection element is made of silicon. With this configuration, a sound collecting element with excellent heat resistance can be formed using a microfabrication technology (MEMS (Micro Electro Mechanical Systems) technology) that applies a semiconductor process technology, so that the microphone device can be reflow mounted. Even in this case, it is possible to obtain a sound collecting element with a small sensitivity change. That is, a highly reliable sound collection element can be obtained. Although the above-described sound pickup element is formed using a fine processing technique (MEMS technique), there is a disadvantage that the sound collection element is delicate and easily damaged. However, by covering the opening with a film member, Therefore, even if such a sound collecting element is arranged in the space, it is possible to prevent the sound collecting element from being damaged by foreign matter or dust. Therefore, by configuring as described above, it is possible to easily suppress a decrease in reliability of the microphone device.

  In the configuration in which the sound collecting element is disposed in the region where the opening and the diaphragm overlap, preferably, the film member is provided on the surface of the housing portion on the space portion side, and the sound collecting element is a film. It is attached to the member. With this configuration, the diaphragm of the sound collecting element can be easily brought close to the opening, and the vibration of the film member due to the sound pressure can be directly transmitted to the sound collecting element. It is possible to more easily suppress a decrease in sound collection efficiency due to the sound collection element.

  In the microphone device according to the above aspect, the film member is preferably made of a polyimide film. If comprised in this way, since a polyimide film is excellent in heat resistance, even when a heat | fever is applied to a film member in a manufacturing process, a deformation | transformation, deterioration, etc. of a film member can be suppressed. For this reason, since a film member can be easily provided in a housing | casing part, the microphone apparatus which can suppress a reliability fall easily can be obtained.

  In the microphone device according to the above aspect, the casing includes a frame and a lid that closes the opening on the upper side of the frame, and the lid and the base are disposed so as to face each other. The opening may be configured to be provided in the lid.

  As described above, according to the present invention, it is possible to easily obtain a microphone device capable of suppressing a decrease in reliability.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments embodying the present invention will be described in detail with reference to the drawings.

(First embodiment)
FIG. 1 is a cross-sectional view of a microphone device according to a first embodiment of the present invention, and FIG. 2 is a plan view of the microphone device according to the first embodiment of the present invention. FIG. 3 is an overall perspective view of the sound collecting element of the microphone device according to the first embodiment of the present invention, and FIG. 4 is a cross-sectional view taken along line 50-50 in FIG. First, the structure of the microphone device 100 according to the first embodiment of the present invention will be described with reference to FIGS.

  As shown in FIGS. 1 and 2, the microphone device 100 according to the first embodiment collects a sound from the outside and converts it into an electric signal, and the electric signal converted by the sound collecting element 10. The sound collecting element 10 and the substrate 30 on which the amplifier 20 is mounted, and a housing portion 40 provided on the substrate 30 so as to cover the sound collecting element 10 and the amplifier 20. The substrate 30 is an example of the “base” in the present invention.

  The sound collection element 10 is composed of a capacitance type condenser macrophone, and is formed by a fine processing technology (MEMS technology) to which a semiconductor process technology is applied. That is, the sound collection element 10 is composed of a silicon microphone element. Specifically, as shown in FIG. 3, the sound collection element 10 is opposed to the vibration film 2 through the semiconductor substrate 1, the vibration film 2 fixed on the semiconductor substrate 1 so as to be able to vibrate, and the gap 3. The rear electrode plate 4 is disposed, and a spacer member (electrical insulating film) 5 is provided between the semiconductor substrate 1 and the rear electrode plate 4 for forming the gap 3 described above. The back electrode plate 4 is provided with a plurality of through holes 4a for receiving sound. The vibrating membrane 2 of the sound pickup element 10 is an example of the “diaphragm” in the present invention.

  The semiconductor substrate 1 is made of insulating silicon, and has an opening 1a penetrating in the thickness direction in a central region as shown in FIG. The vibration film 2 is made of conductive silicon (for example, silicon whose insulation resistance is lowered by ion implantation or the like), and is attached on the upper surface of the semiconductor substrate 1 so as to cover the opening 1a. Yes. Thereby, the vibrating membrane 2 is configured to be able to vibrate according to a change in sound pressure due to sound waves.

  The back electrode plate 4 is made of conductive silicon (for example, silicon whose insulation resistance is lowered by ion implantation or the like), and a spacer member 5 made of an electrical insulating film such as a silicon oxide film. Thus, the diaphragm 2 is disposed to face the vibration film 2 at a predetermined distance. Thereby, the vibrating membrane 2 and the back electrode plate 4 constitute a capacitor. Therefore, when the vibrating membrane 2 vibrates according to the sound pressure change due to the sound wave, the electrostatic capacity changes, so that mechanical vibration due to the sound wave is detected as a change in electrostatic capacity (electric signal).

  The amplifier 20 has a function of amplifying the electric signal by applying a voltage to the electric signal converted by the sound collection element 10.

  Further, as shown in FIG. 1, the substrate 30 has a structure in which a plurality of glass epoxy substrates 31 are laminated. This glass epoxy substrate 31 is composed of a double-sided substrate in which a wiring layer 31b having a predetermined wiring pattern is formed on both surfaces of an insulating base part 31a. Each of the plurality of glass epoxy substrates 31 is a semi-cured epoxy resin. Are adhered to each other by an organic material-based adhesive layer 32.

  A terminal portion 311b (31b) electrically connected to a wiring layer of a mounting substrate (not shown) is formed on the lowermost surface of the substrate 30. The surface of the terminal portion 311b (31b) is subjected to a surface treatment such as a plating process, whereby a metal coating 33 such as nickel (Ni) is formed on the surface of the terminal portion 311b (31b). Yes. The metal coating 33 has a function of preventing oxidation of the terminal portion 311b (31b). The metal coating 33 can also be formed by a vapor deposition method other than plating.

  Further, the sound pickup element 10 and the amplifier 20 described above are fixed on the upper surface of the substrate 30 by a die bond paste 34, respectively. This die bond paste 34 contains a crushed silica filler, thereby improving heat resistance and enabling high-density filling.

  The sound pickup element 10 is fixed so that the semiconductor substrate 1 is on the substrate 30 side. On the other hand, the amplifier 20 is disposed in the vicinity of the sound collection element 10 and is electrically connected to the sound collection element 10 via a bonding wire 11 made of a thin metal wire such as gold (Au) or aluminum (Al). Has been. Further, the amplifier 20 is electrically connected to the wiring layer 312 b (31 b) formed on the uppermost surface of the substrate 30 through the bonding wire 12. The amplifier 20 is sealed with a resin layer 21. The resin layer 21 contains a spherical silica filler, thereby improving the wear resistance and enabling high-density filling. The resin layer 21 is formed to seal the amplifier 20 by potting. The terminal portion 311b of the substrate 30 and the wiring layer 312b formed on the uppermost surface of the substrate 30 are electrically connected to each other via a through hole (not shown).

  In addition, the casing 40 includes a frame body 41 that is installed on the substrate 30 so as to surround the sound collection element 10, and a lid body 42 that closes the opening on the upper side of the frame body 41. A space 43 is formed by the substrate 30 and the housing 40, and the sound collection element 10 and the amplifier 20 are disposed in the space 43. That is, the substrate 30 and the casing 40 constitute a package that houses the sound collection element 10 and the amplifier 20.

  Moreover, the frame 41 which comprises the housing | casing part 40 consists of a glass epoxy board comprised by frame shape. This glass epoxy substrate has a structure in which a conductor layer 41b made of copper (Cu) or the like is formed on the surface of the insulating base portion 41a, and the surface of the conductor layer 41b is nickel ( A metal coating 44 made of Ni) or the like is formed. The frame 41 is fixed on the substrate 30 by an adhesive layer 45. The adhesive layer 45 is made of an organic material resin such as a semi-cured epoxy resin and is cured at a temperature of about 250 ° C.

  On the other hand, the lid 42 constituting the housing unit 40 is made of a metal plate such as a copper (Cu) plate. As shown in FIG. 2, a circular opening 42 a is formed in a predetermined region of the lid body 42 in a plan view. The opening 42 a penetrates in the thickness direction of the lid 42 and has a function of taking external sound (sound pressure) into the space 43.

  Here, in the first embodiment, as shown in FIG. 1, a film member 46 made of a polyimide film having a thickness of about 25 μm is provided on the lower surface (surface on the space 43 side) of the lid body 42. The film member 46 closes the entire opening 42 a of the lid 42.

  Each of the upper surface of the lid 42 and the inner surface of the opening 42a is subjected to a surface treatment such as a plating treatment. As a result, a metal film 47 similar to the metal films 33 and 44 described above is formed on the upper surface of the lid 42 and the inner surface of the opening 42a. The lid 42 is fixed to the upper side (on the upper surface) of the frame 41 by an adhesive layer 48 similar to the adhesive layer 45 described above.

  In the first embodiment, as shown in FIGS. 1 and 2, the sound collection element 10 is placed on the substrate 30 so that the vibration film 2 and the opening 42 a of the lid body 42 overlap each other when seen in a plan view. Has been implemented. Specifically, the sound collection element 10 is arranged so that the opening 42 a of the lid 42 is positioned directly above the vibration film 2.

  In the first embodiment, as described above, the film member 46 is provided on the lower surface of the lid 42 so as to close the opening 42 a, so that the opening 42 a for taking in sound pressure is provided as the lid of the casing 40. Even if it is provided in 42, it is possible to suppress the entry of foreign matter, dust or the like from the opening 42a into the space 43 where the sound collection element 10 is disposed. For this reason, since it can suppress that the inconvenience that the sound collection element 10 breaks resulting from a foreign material, dust, etc. invading into the space part 43, the fall of reliability can be suppressed. . When the space 43 is sealed by closing all of the openings 42a with the film member 46, it is possible to suppress the intrusion of moisture or the like into the space 43, so that the microphone device with excellent water resistance is used. 100 can be obtained.

  Further, in the first embodiment, even if the opening 42a is blocked by the film member 46 by blocking the opening 42a of the lid 42 so as to prevent foreign matter or dust from entering the space 43, A decrease in sound collection efficiency due to the sound collection element 10 can be suppressed. That is, when the opening 42 a is closed by the film member 46, the opening 42 a portion of the film member 46 vibrates due to the sound pressure from the outside, so that the sound pressure from the outside is transmitted to the space 43 by the vibration. . For this reason, even if the opening 42a is closed, the sound pressure is taken into the space 43 in which the sound collection element 10 is arranged (mounted), so that a decrease in sound collection efficiency by the sound collection element 10 is suppressed.

  In the configuration of the first embodiment described above, the film member 46 is provided on the lower surface where the opening 42a of the lid 42 is formed. Therefore, even when the thickness of the film member 46 is reduced, the film member 46 can be easily opened. The film member 46 can be provided in the housing so as to close the portion 42a. For this reason, by reducing the thickness of the film member 46, it is possible to easily transmit the sound pressure from the outside to the space portion 43. Sound (sound pressure) can be efficiently collected by the sound collecting element 10.

  In the first embodiment, the sound collecting element 10 is disposed so that the opening 42 a of the lid 42 is positioned directly above the vibration film 2, whereby the vibration film 2 of the sound collecting element 10 is placed in the opening 42 a. Therefore, even when the opening 42 a is closed with the film member 46, the sound from the outside (sound pressure) can be collected more efficiently by the sound collection element 10. Thereby, the fall of the sound collection efficiency by the sound collection element 10 can be suppressed easily, suppressing the fall of reliability.

  In the first embodiment, the sound collection element 10 is made of a silicon microphone element, so that the sound collection element 10 can be obtained with higher reliability than an electret condenser microphone (ECM). When the sound pickup element 10 is composed of a silicon microphone element, the opening 42a is formed in the film member 46, although there is a disadvantage that it is delicate and easily damaged because it is formed using a fine processing technique (MEMS technique). By covering with, the entry of foreign matter or dust into the space 43 is suppressed, so even if such a sound collecting element 10 is disposed in the space 43, the sound collecting element 10 is damaged by foreign matter or dust. Can be suppressed.

  Moreover, in 1st Embodiment, when the film member 46 which closes the opening part 42a is comprised from a polyimide film, since a polyimide film is excellent in heat resistance, when heat is added to the film member 46 in a manufacturing process However, deformation and deterioration of the film member 46 can be suppressed. Specifically, since the polyimide film has a heat resistance of about 400 ° C., in order to cure the adhesive layers 45 and 48 for bonding the frame body 41 and the lid body 42, the polyimide film has a temperature of about 250 ° C. Even when heat is applied, deformation and deterioration of the film member 46 can be suppressed. For this reason, since the film member 46 can be easily provided in the housing | casing part 40 (lid 42), the microphone apparatus 100 which can suppress the fall of reliability can be obtained easily. In addition, by constituting the film member 46 from a polyimide film, when the microphone device 100 is reflow-mounted on a mounting substrate (not shown) or the like, the film member 46 is prevented from being deformed or deteriorated by heat during mounting. be able to.

(Second Embodiment)
FIG. 5 is a cross-sectional view of a microphone device according to a second embodiment of the present invention. FIG. 6 is a plan view of a microphone device according to a second embodiment of the present invention. Next, the structure of the microphone device 200 according to the second embodiment of the present invention will be described with reference to FIGS.

  In the microphone device 200 according to the second embodiment, as shown in FIG. 5, unlike the first embodiment, the sound collection element 10 and the amplifier 20 are fixed on the lower surface of the lid body 42 via a film member 46. Yes. Specifically, a film member 46 is provided on the lower surface of the lid body 42 so as to block all of the opening 42a, and on the lower surface of the film member 46 (on the surface opposite to the lid body 42). The sound collecting element 10 and the amplifier 20 are fixed with a die bond paste 134. The die bond paste 134 contains a crushed silica filler, which improves heat resistance and enables high-density filling. In addition, the film member 46 is comprised from the polyimide film which has a thickness of about 25 micrometers similarly to the said 1st Embodiment.

  Further, as shown in FIG. 6, the opening 42 a of the lid 42 is formed in a circular shape when viewed from above, and the opening area is smaller than the plane area of the sound collection element 10. It is configured. As shown in FIGS. 5 and 6, the sound pickup element 10 is fixed on the lower surface of the film member 46 so that the vibration film 2 and the opening 42 a of the lid body 42 overlap each other when seen in a plan view. Yes. Specifically, the sound collection element 10 is arranged so that the opening 42 a of the lid 42 is positioned directly above the vibration film 2.

  The sound pickup element 10 is fixed so that the semiconductor substrate 1 is on the film member 46 side. For this reason, since the vibration film 2 directly faces the film member 46 without the back electrode plate 4, when the opening 42a portion of the film member 46 is vibrated by an external sound (sound pressure), The sound pressure caused by the vibration can be directly received by the vibration film 2 of the sound collection element 10. Since the opening 42a of the lid 42 is configured such that the opening area is smaller than the plane area of the sound collection element 10, when the sound collection element 10 is arranged as described above, the sound collection It becomes possible to fix the element 10 on the area | region of the outer peripheral part of the opening part 42a (on the lower surface of the cover body 42). For this reason, even when the opening 42a portion of the film member 46 vibrates, it is possible to suppress the entire sound collection element 10 from moving (vibrating) due to the vibration. The opening area of the opening 42a is preferably formed as large as possible within a range in which the sound collecting element 10 can be fixed on the outer peripheral area of the opening 42a (on the lower surface of the lid 42). .

  On the other hand, the amplifier 20 is disposed in the vicinity of the sound collection element 10 and is electrically connected to the sound collection element 10 via a bonding wire 111 made of a thin metal wire such as gold (Au) or aluminum (Al). Has been.

  In addition, a wiring layer 110 is formed in a predetermined region on the lower surface of the film member 46 (on the surface opposite to the lid 42), and the wiring layer 110 and the amplifier 20 described above connect the bonding wire 112. Are electrically connected to each other. Further, the wiring layer 110 is electrically connected to the terminal portion 311b (31b) formed on the lowermost surface of the substrate 30 through the conductor layer 41b of the frame body 41, the wiring layer 31b of the substrate 30, and the like. The amplifier 20 is sealed with a resin layer 121 similar to that in the first embodiment.

  Other configurations of the microphone device 200 according to the second embodiment are the same as those of the first embodiment.

  In the second embodiment, as described above, the sound collecting element 10 is easily fixed on the lower surface of the film member 46 so that the opening 42a of the lid 42 is positioned directly above the vibration film 2. In addition, the vibration film 2 of the sound collection element 10 can be brought close to the opening 42a, and the vibration of the film member 46 due to the sound pressure can be directly transmitted to the vibration film 2 of the sound collection element 10. It is possible to more easily suppress a decrease in sound collection efficiency due to the sound collection element 10 while suppressing a decrease in noise.

  Other effects of the second embodiment are the same as those of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the first and second embodiments, the example in which all the openings formed in the lid are closed with the film member is shown. However, the present invention is not limited to this and is formed in the lid. Further, a configuration in which a part of the opening is not covered with the film member may be used.

  In the first and second embodiments, the example in which the sound pickup element (silicon microphone element) formed using the MEMS technology is mounted is shown. However, the present invention is not limited to this, and the sound pickup element described above is used. Other sound collecting elements may be mounted.

  Moreover, in the said 1st and 2nd embodiment, although the example which used the polyimide film for the film member which plugs up an opening part was shown, this invention is not restricted to this, An opening part is used using film members other than a polyimide film. You may make it close. For example, the opening may be blocked using a permeable membrane or the like. Note that when an opaque film member is used as the film member that closes the opening, it is possible to block light from entering the space where the sound collection element or the like is arranged, so that the microphone device has excellent light resistance. Can be obtained.

  In the first and second embodiments, an example in which the casing portion in which the frame body and the lid body are formed separately is fixed on the substrate is shown. However, the present invention is not limited to this, and the frame body is not limited thereto. A housing part integrally formed with the lid may be fixed on the substrate.

  Further, in the first and second embodiments, the example in which the opening is formed in a circular shape when viewed in plan is shown, but the present invention is not limited to this, and other than the circular shape when the opening is viewed in plan. You may form in this shape. For example, the opening may be formed in a square shape.

  Moreover, in the said 1st Embodiment, although the example which provided the film member on the lower surface (surface on the space part side) of the cover body (housing | casing part) was shown, this invention is not limited to this, A film member is shown. You may provide on the upper surface (surface on the opposite side to the space part side) of a cover body (casing part).

  In the second embodiment, the example in which the opening area of the opening of the lid is configured to be smaller than the plane area of the sound collecting element has been described. However, the present invention is not limited to this, and the opening of the lid is provided. You may comprise so that the opening area of a part may become larger than the plane area of a sound collection element. In the first embodiment as well, the opening area of the opening of the lid can be configured to be larger than the plane area of the sound collection element.

1 is a cross-sectional view of a microphone device according to a first embodiment of the present invention. 1 is a plan view of a microphone device according to a first embodiment of the present invention. 1 is an overall perspective view of a sound collection element of a microphone device according to a first embodiment of the present invention. FIG. 5 is a cross-sectional view taken along line 50-50 in FIG. It is sectional drawing of the microphone apparatus by 2nd Embodiment of this invention. It is a top view of the microphone apparatus by 2nd Embodiment of this invention.

Explanation of symbols

1 Semiconductor substrate 2 Vibration membrane (diaphragm)
3 Space part 4 Back electrode plate 5 Spacer member 10 Sound collecting element 20 Amplifier 30 Substrate (base part)
32 Adhesive layer 34, 134 Die bond paste 40 Case part 41 Frame body 42 Cover body 42a Opening part 43 Space part 46 Film member 100, 200 Microphone device

Claims (7)

  1. A base,
    A housing part provided on the base part and forming a space part together with the base part;
    A sound collection element that is disposed in the space and collects sound from outside and converts it into an electrical signal;
    The housing has an opening for taking sound pressure into the space,
    A microphone device, wherein a film member that closes at least a part of the opening is provided on a surface of the housing where the opening is formed.
  2.   The microphone device according to claim 1, wherein the film member is attached on a surface of the housing portion so as to close all of the opening portions.
  3.   The sound collecting element has a diaphragm that vibrates in response to sound pressure, and is arranged in a region where the opening and the diaphragm overlap when viewed in a plan view. A microphone device according to 1.
  4.   The microphone device according to claim 3, wherein the diaphragm of the sound collection element is made of silicon.
  5. The film member is provided on a surface of the housing portion on the space portion side,
    The microphone device according to claim 3 or 4, wherein the sound pickup element is attached to the film member.
  6.   The microphone device according to claim 1, wherein the film member is made of a polyimide film.
  7. The housing portion includes a frame body and a lid body that closes the opening on the upper side of the frame body, and the lid body and the base portion are disposed so as to face each other.
    The microphone device according to claim 1, wherein the opening is provided in the lid.
JP2007221973A 2007-08-29 2007-08-29 Microphone apparatus Pending JP2009055490A (en)

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JP2009055490A5 JP2009055490A5 (en) 2010-10-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2012017805A1 (en) * 2010-08-05 2012-02-09 船井電機株式会社 Microphone unit
CN102948266A (en) * 2010-04-22 2013-02-27 施韦策电子公司 Printed circuit board with cavity
JP2015530030A (en) * 2012-08-10 2015-10-08 ノールズ エレクトロニクス,リミテッド ライアビリティ カンパニー Microphone assembly with a barrier to prevent entry of contaminants

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