WO2006013940A1 - 耐熱型エレクトレットコンデンサマイクロホン - Google Patents
耐熱型エレクトレットコンデンサマイクロホン Download PDFInfo
- Publication number
- WO2006013940A1 WO2006013940A1 PCT/JP2005/014333 JP2005014333W WO2006013940A1 WO 2006013940 A1 WO2006013940 A1 WO 2006013940A1 JP 2005014333 W JP2005014333 W JP 2005014333W WO 2006013940 A1 WO2006013940 A1 WO 2006013940A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- condenser microphone
- heat
- electret condenser
- film
- temperature
- Prior art date
Links
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/01—Electrostatic transducers characterised by the use of electrets
- H04R19/016—Electrostatic transducers characterised by the use of electrets for microphones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B7/00—Microstructural systems; Auxiliary parts of microstructural devices or systems
- B81B7/0009—Structural features, others than packages, for protecting a device against environmental influences
- B81B7/0012—Protection against reverse engineering, unauthorised use, use in unintended manner, wrong insertion or pin assignment
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R19/00—Electrostatic transducers
- H04R19/005—Electrostatic transducers using semiconductor materials
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B81—MICROSTRUCTURAL TECHNOLOGY
- B81B—MICROSTRUCTURAL DEVICES OR SYSTEMS, e.g. MICROMECHANICAL DEVICES
- B81B2201/00—Specific applications of microelectromechanical systems
- B81B2201/02—Sensors
- B81B2201/0257—Microphones or microspeakers
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R2499/00—Aspects covered by H04R or H04S not otherwise provided for in their subgroups
- H04R2499/10—General applications
- H04R2499/11—Transducers incorporated or for use in hand-held devices, e.g. mobile phones, PDA's, camera's
Definitions
- the present invention relates to an outer-letter condenser microphone mounted on an information communication device such as a mobile phone.
- FIG. 8 is a diagram showing a basic structure of an electret condenser microphone.
- a protective face cloth 101 is a cloth arranged for the purpose of preventing the entry of dust and the like, and a cloth having excellent sound transmission properties such as a nonwoven fabric is used.
- the fixed electrode 102 a metal or an electrode whose surface facing the vibrating membrane is subjected to conductive treatment is used.
- the electret film 103 is a dielectric film installed on the fixed electrode 102, and generally FEP (propylene hexafluoride tetrafluoride) is attached to the fixed electrode 102 by heat fusion.
- FEP propylene hexafluoride tetrafluoride
- the vibration film 104 a metal thin film or a plastic film whose one surface is subjected to conductive treatment is used.
- a diaphragm is bonded to the diaphragm supporting ring 105.
- the spacer 106 is provided so that the vibrating membrane and the fixed electrode form and maintain a predetermined positional relationship.
- the circuit component 107 is also configured with a force such as an FET or a resistor.
- a circuit component 107 is mounted on the circuit board 108 by soldering or the like, and is used to convert a change in electrostatic capacitance between the diaphragm and the fixed electrode caused by vibration displacement of the diaphragm into an electric signal.
- a preamplifier is formed and a terminal board and a bottom board are formed.
- the spacer 109 forms a desired space between the fixed electrode 102 and the circuit board 108.
- the casing 110 is made of a metal such as aluminum, which is made of conductive plastic, and the lower end is reinforced or bonded to form a housing and a shield case. I have a problem.
- an electret condenser microphone The basic operation of an electret condenser microphone is to form a potential between the vibrating membrane and the fixed electrode, and take out the displacement of the vibrating membrane as an electrical output for sound pressure. By charging the electret layer with a charge, a high potential (several tens of volts) is maintained between the vibrating membrane and the fixed electrode. The displacement of the diaphragm due to the sound pressure can be taken out as a larger electric output.
- electret condenser microphones have been mounted on a board mounted on a mobile phone or the like as a mounting part via a connector or the like, but in recent years, a reflow method using a microphone itself has been used to directly connect a mobile phone or the like. It is becoming necessary to mount it on the board.
- Patent Document 1 a parallel-plate condenser microphone has been proposed using a micro-technology so that it can be adapted to Pb-free reflow.
- Patent Document 1 Japanese Patent Application Laid-Open No. 2002-95093
- Figure 9 shows the reflow temperature profile used when directly mounting on a substrate such as a mobile phone.
- Pb-free reflow reflow using a solder material that does not contain Pb
- Figure 9 shows a typical Pb-free reflow temperature profile.
- heating is performed at 260 degrees for about 10-30 seconds, so the reflowed parts must have heat resistance that can withstand this.
- FIG. 10 shows the experimental results of measuring the surface potential when heating an electrode with FEP (film thickness: 25 ⁇ m) as the electret.
- the horizontal axis is the heating temperature (30 seconds), and the horizontal axis is the electret surface potential.
- Figure 10 shows that a potential drop of about 20% was observed at a surface potential of 200 ° C, which was -25 OV at room temperature, and almost 90% disappeared at 300 ° C. This experimental result suggests that normal ECM cannot adapt to Pb-free reflow! /!
- the present invention has been made in view of the above circumstances, and an object thereof is to provide an electret condenser microphone that can withstand high temperatures.
- it is intended to provide a heat-resistant structure that can pass through a reflow solder bath for a short time when mounted on an applicable device, and can prevent the function from being impaired by high heat at that time.
- the electret condenser microphone of the present invention covers the casing that accommodates the entire microphone phone on the outer surface of the casing with a coating material having low thermal conductivity. Especially when passing through a reflow solder bath, the thickness and thermal conductivity of the coating material are controlled so that the dielectric layer for forming the electret passes through the solder bath before reaching the charge dissipation temperature. By doing so, the deterioration of the dielectric layer due to the temperature rise is prevented.
- This coating material is made of a material whose thermal conductivity is lower than that of metal, whose material alteration temperature is higher than the charge dissipation temperature of the dielectric layer for forming the inner electret, and whose material alteration temperature is higher than 260 ° C. By doing so, the internal temperature rise can be mitigated by the thermal resistance and the internal heat capacity.
- the first electret condenser microphone of the present invention includes a vibrating membrane having conductivity on one side, a fixed electrode arranged to face the vibrating membrane via an air layer, the vibrating membrane or A dielectric layer serving as an electret for storing electric charge in one of the fixed electrodes, circuit means for converting the capacitance between the vibrating membrane and the fixed electrode into an electric signal, and the electric signal derived to the outside External connection means for performing, and a spacer for forming and holding a predetermined positional relationship between the vibrating membrane and the fixed electrode, and forming a space between the fixed electrode and the circuit means,
- the outer surface of the casing has the induction temperature at which the deformation temperature becomes the electret. Higher than the charge loss temperature of the body layer, covered by a non-metallic material, and wherein the Rukoto.
- the second electret condenser microphone of the present invention is made of a non-metallic material covering the housing.
- Polyimide Polyimide, liquid crystal polymer, polyetherimide (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PEI), polyetheretherketone (PE)
- EK polyether-tolyl
- PPS poly-phenylene-sulfide
- the third electret condenser microphone of the present invention is characterized by using polytetrafluoroethylene (PTFE) as a dielectric material for forming the electret.
- PTFE polytetrafluoroethylene
- the fourth electret condenser microphone of the present invention is made of polytetrafluoroethylene (Pt)
- the film thickness of TFE is more than 3 times the particle size of PTFE.
- a fifth electret condenser microphone of the present invention uses an oxide silicon film (SiO 2) as an electret forming dielectric material, and the oxide silicon film (SiO 2) is made of a silicon oxide film or less.
- the structure is completely covered with an external insulator and the silicon oxide film (SiO 2) is not exposed to the atmosphere.
- a sixth electret condenser microphone of the present invention has a silicon oxide film (SiO 2).
- the spacer material is polyimide, liquid crystal polymer, polyetherimide (PEI), polyetheretherketone (PEEK), polyester-tolyl (PEN). ), Poly-phenylene sulfide (PPS), or any of these!
- the present invention is applied to an electret condenser microphone that is frequently used in information communication equipment, and improves its performance, particularly heat resistance, eases handling restrictions when installing the electret condenser microphone, and improves convenience.
- a high electret condenser microphone can be provided.
- FIG. 1 Schematic diagram of a configuration representing the concept of the present invention.
- FIG. 2 An electrical equivalent circuit representing the concept of the present invention.
- FIG. 3 is a diagram showing the temperature inside the housing of the electret condenser microphone of the present invention.
- FIG. 4 Configuration diagram of the electret condenser microphone of the present invention.
- FIG. 5 shows an electret according to the present invention.
- FIG. 1 and 2 are schematic diagrams showing the concept of the present invention.
- FIG. 1 is a schematic representation of the configuration
- FIG. 2 is a diagram showing FIG. 1 as an electrical equivalent circuit.
- the electret condenser microphone according to the first embodiment has a charge on the outer surface of the microphone casing 11 as the casing coating 1 and the electric charge of the dielectric layer whose deformation temperature becomes the electret.
- polyimide which is a non-metallic material with high thermal resistance and high heat capacity that is higher than the dissipation temperature
- the inside of the housing, especially the dielectric layer reaches the charge dissipation temperature when passing through the solder bath. It is characterized by being protected so as not to.
- the component group in the housing is represented by 30.
- the resistor represents 40 and the capacitor represents 50.
- the left side of the resistor 40 corresponds to the input, that is, the external temperature
- both ends on the right side of the capacitor 50 correspond to the internal temperature.
- Fig. 3 shows the relationship between the temperature rise inside the housing of the electret condenser microphone having the configuration shown in Fig. 1 and the external temperature.
- the horizontal axis represents time and the vertical axis represents temperature.
- the curve indicating the temperature is a
- the curve indicating the temperature inside the microphone case is b.
- the heat resistance applied to the housing surface is high (low thermal conductivity; And the temperature rise is delayed due to the presence of the entire internal heat capacity.
- the external temperature has a high temperature (260 ° C) holding time as short as 10 to 30 seconds as shown in the solder reflow temperature profile shown in Fig. 9. Will drop and the internal temperature will not rise to a high temperature (260 ° C).
- the resistor 40 shows the thermal resistance due to the coating 1
- the capacitor 50 shows the overall heat capacity including the housing 11, and the equivalent shown in Fig. 2. It can be confirmed that the circuit itself is a delay circuit for conducting heat from the outside, and that the inside of the housing does not rise as much as the outside temperature if the external high temperature time is short.
- a sensor microphone can be realized.
- FIG. 4A and 4B are diagrams showing an embodiment of the present invention, where FIG. 4A is a perspective view and FIG. 4B is a cross-sectional view.
- the material of the coating film 1 that covers the housing is polyimide.
- the electret condenser microphone of this example is an electret film that is a vibrating film having conductivity on one side.
- a fixed electrode 3 disposed so as to face the electret film 4 through an air layer, and a spacer disposed so that the electret film 4 and the fixed electrode 3 form and hold a predetermined positional relationship.
- 7 and a spacer 12 that forms a space between the fixed electrode 3 and the circuit board 9 constituting the circuit means so that only the wiring pattern 10 as the external connection means is exposed.
- the protective face cloth 2 is formed on the case 11 covered with the coating film 1, and the fixed electrode 3, the electret film 4, the vibration film 5, the vibration film support ring 6, Spacer 7, powerful circuit components 8 such as FETs and resistors
- the wiring pattern for connection to another substrate provided on the circuit board 9 is 10, and is connected to the other substrate by solder during the reflow process.
- the spacer 12 forms a desired space between the fixed electrode 3 and the circuit board 9.
- the coating film 1 is made of polyimide.
- polyimide liquid crystal polymer, polyetherimide (PEI), polyetheretherketone (PEEK), polyester ter-tolyl ( PEN), poly-phenylene sulfide (PPS), or composite materials
- the deformation temperature of these materials is higher than the charge dissipation temperature of the dielectric material that forms the dielectric layer for forming the internal electret. Since it is a high-strength material, it can be used as a similar coating film.
- These materials have melting points higher than the temperature acting on the microphone during reflow, as shown in the table below.
- the maximum temperature during reflow is 260 ° C and the holding time is 10 to 30 seconds. When these materials are used, the microphone structure is not damaged.
- a face cloth having a heat resistance of 260 ° C (for example, lanthanum non-woven fabric manufactured by Asahi Kasei Kogyo) is applied.
- the material of the fixed electrode 3 is stainless steel or brass, and it is desirable to use the force PTFE that can be applied to FEP as the dielectric material constituting the electret film 4. The reason is that PTFE (melting point: 327 ° C, decomposition start temperature: about 390 ° C) has higher heat resistance than FEP (melting point: 250-280 ° C, decomposition start temperature: about 290 ° C)! /, Because.
- the film thickness of PTFE is desirably at least 3 times the particle diameter of PTFE in order to form a high-quality film having no pinholes.
- Fig. 7 is an explanatory diagram showing the reason why the particle size of PTFE is 3 times or more, and shows the state of the PTEF coating on the substrate.
- the substrate is 18 and the PTFE particles are 19.
- the PTFE film is sprayed on the substrate 18 in a liquid state in which a binder and PTFE particles are mixed to form a coating film. Thereafter, the binder is formed by drying.
- the center particle size of PTFE is 1-10 m.
- the electret film is twice as thick as the PTFE particle diameter
- a gap is generated between the PTFE particles, and the PTFE film is a film with pinholes.
- the PTFE film 19 may be in contact with each other to form a PTFE film without a pinhole. it can.
- the material of the diaphragm 5 is a titanium foil, and its thickness is 2 m. Titanium is desirable as the material of the diaphragm support ring 6, but since titanium is a difficult material to process, stainless steel is selected and diaphragm 5 and diaphragm support ring 6 are made of thermoplastic conductive resin. It may be glued. Since thermoplastic conductive resin exhibits fluidity when heated, it absorbs the difference in thermal expansion between diaphragm 5 and diaphragm support ring 6 when the microphone housing body is heated. It can be configured to do so.
- spacer 7 and spacer 12 are polyimide.
- liquid crystal polymer polyetherimide (PEI), polyetheretherketone (PEEK), Ether-tolyl (PEN), poly-phenylene sulfide (PPS) !, slip, or composite.
- the material of the housing 11 is aluminum, but it is not limited to aluminum, and may be a material such as stainless steel.
- the bottom surface of the casing 11 is bonded to the circuit board 9 with a thermoplastic conductive resin.
- the temperature of the material for assembling the microphone is increased by the effect of the internal heat capacity by delaying the conduction of heat to the inside of the short-time high-temperature environment imposed when passing through the solder reflow process. It is intended to suppress.
- the present invention does not correspond to the case where the thermal equilibrium is achieved inside and outside in a high temperature environment for a long time, the object can be sufficiently achieved from the viewpoint of heat resistance against the Pb-free reflow process.
- the present invention has the effect that it can be realized with only a slight modification to the conventional microphone production process, and is economical (microphone production cost). It ’s excellent.
- FIG. 2 shows a second embodiment of the present invention.
- Example 1 the same effect can be obtained even when a silicon oxide film (SiO 2) is used in addition to the force PTFE in which PTFE is used as the electret film.
- SiO 2 silicon oxide film
- FIG. 5 is a diagram showing an electrode structure using an oxide silicon film as an electret film.
- the vibration film includes a silicon substrate 13, an oxide silicon film 14 functioning as an electret, a silicon nitride film 15 covering the periphery of the oxide silicon film, a metal film 16 formed on the back surface of the silicon substrate 13, silicon It is configured to have holes 17 provided in the substrate 13! RU
- the silicon oxide film 14 is preferably formed by a plasma CVD method or a low pressure CVD method. This is because the temperature during film formation can be set to 300 ° C or higher.
- the film formation By carrying out the film formation at a temperature of 300 ° C or higher, it is possible to prevent contamination with unnecessary elements (for example, H and N). Although it is possible to form an oxide silicon film at 300 ° C or higher by sputtering, the sputtering of the oxide silicon film becomes Si 0 and becomes SiO.
- the holes 17 are formed by wet etching or dry etching.
- the feature of this embodiment is that the silicon oxide film 14 is completely covered with another insulating film (silicon nitride film 15 in this example).
- the silicon oxide film has the property of adsorbing moisture in the atmosphere when exposed to the atmosphere.
- electret films that store charges including not only silicon oxide films but other electret films such as FEP
- FEP electret films that store charges
- the silicon film will adsorb moisture in the atmosphere and the characteristics as an electret film will be deteriorated. Therefore, the present invention provides an oxide silicon film (SiO 2) as a silicon
- FIG. 6 shows the electrification characteristics of the electret when the silicon oxide film 600 formed by low pressure CVD is completely covered with the silicon nitride film formed by low pressure CVD in the structure shown in FIG. FIG.
- the thickness of the silicon nitride film was 200 nm on the bottom surface of the silicon oxide film and 200 nm on the top surface.
- a metal film 16 composed of a two-layer film of titanium (aluminum: thickness 50 nm) and gold (Au: thickness 150) was formed.
- 150 samples were formed.
- the surface potential was measured by heating C for 30 seconds each.
- the electret of the silicon oxide film was strong enough to prevent the charging potential from deteriorating by heating.
- the silicon oxide film 14 By completely covering the silicon oxide film 14 with the silicon nitride film 15, it acts as a silicon nitride film force barrier, prevents moisture adsorption and degrades charging It is estimated that it worked to prevent this.
- the configuration of the electret condenser microphone of the present invention makes it possible to produce a heat-resistant microphone that is economical and can be a surface-mountable electret condenser microphone. Useful for board production
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/589,281 US7590252B2 (en) | 2004-08-06 | 2005-08-04 | Heat-resistant electret condenser microphone |
EP05768599A EP1775992A4 (en) | 2004-08-06 | 2005-08-04 | THERMOSTATIC ELECTRET CAPACITOR MICROPHONE |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2004-230407 | 2004-08-06 | ||
JP2004230407A JP2006050385A (ja) | 2004-08-06 | 2004-08-06 | 耐熱型エレクトレットコンデンサマイクロホン |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2006013940A1 true WO2006013940A1 (ja) | 2006-02-09 |
Family
ID=35787219
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2005/014333 WO2006013940A1 (ja) | 2004-08-06 | 2005-08-04 | 耐熱型エレクトレットコンデンサマイクロホン |
Country Status (6)
Country | Link |
---|---|
US (1) | US7590252B2 (ja) |
EP (1) | EP1775992A4 (ja) |
JP (1) | JP2006050385A (ja) |
KR (1) | KR20070038449A (ja) |
CN (1) | CN1918943A (ja) |
WO (1) | WO2006013940A1 (ja) |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2007267272A (ja) * | 2006-03-29 | 2007-10-11 | Matsushita Electric Ind Co Ltd | コンデンサマイクロフォン |
KR100765339B1 (ko) | 2006-04-13 | 2007-10-10 | 주식회사 블루콤 | 고온에도 특성이 열화되지 않는 콘덴서 마이크로폰 |
KR100758839B1 (ko) * | 2006-05-22 | 2007-09-14 | 주식회사 비에스이 | Smd용 마이크로폰의 실장 방법 및 이에 적합한 홀더 |
EP1931173B1 (en) * | 2006-12-06 | 2011-07-20 | Electronics and Telecommunications Research Institute | Condenser microphone having flexure hinge diaphragm and method of manufacturing the same |
US20090097687A1 (en) * | 2007-10-16 | 2009-04-16 | Knowles Electronics, Llc | Diaphragm for a Condenser Microphone |
US7795063B2 (en) * | 2007-12-31 | 2010-09-14 | Solid State System Co., Ltd. | Micro-electro-mechanical systems (MEMS) device and process for fabricating the same |
US8258591B2 (en) * | 2008-01-16 | 2012-09-04 | Solid State System Co., Ltd. | Micro-electro-mechanical systems (MEMS) device |
JP5700949B2 (ja) * | 2009-04-14 | 2015-04-15 | 日東電工株式会社 | エレクトレット材の製造方法 |
EP2449796A1 (en) | 2009-06-29 | 2012-05-09 | Nokia Corp. | Temperature compensated microphone |
KR101618141B1 (ko) * | 2012-04-17 | 2016-05-04 | 고쿠리츠다이가쿠호진 사이타마 다이가쿠 | 일렉트릿 구조체 및 그 제조 방법 및 정전 유도형 변환 소자 |
JP5627130B2 (ja) * | 2012-08-30 | 2014-11-19 | アオイ電子株式会社 | 正イオンを含有したエレクトレットの形成方法 |
US20140291783A1 (en) * | 2013-03-21 | 2014-10-02 | Knowles Electronics, Llc | Cover for a mems microphone |
WO2018032466A1 (en) * | 2016-08-18 | 2018-02-22 | Harman International Industries, Incorporated | Electret condenser microphone and manufacturing method thereof |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09283373A (ja) * | 1996-04-15 | 1997-10-31 | Matsushita Electric Works Ltd | シリコン酸化膜エレクトレット |
JP2002125297A (ja) * | 2000-10-17 | 2002-04-26 | Toho Kasei Kk | エレクトレット用積層板 |
JP2003199197A (ja) * | 2001-12-13 | 2003-07-11 | Bse Co Ltd | 超高電荷保存特性を有する多層エレクトレット及びその製造方法 |
JP2003259493A (ja) * | 2002-02-27 | 2003-09-12 | Star Micronics Co Ltd | エレクトレットコンデンサマイクロホン |
JP2004166262A (ja) * | 2002-10-23 | 2004-06-10 | Matsushita Electric Ind Co Ltd | 電気音響変換器及びその製造方法 |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS4861126A (ja) * | 1971-12-02 | 1973-08-27 | ||
JP2002095093A (ja) | 2000-09-12 | 2002-03-29 | Seiko Epson Corp | コンデンサマイクロホンおよびその製造方法および音声入力装置 |
US7136496B2 (en) * | 2001-04-18 | 2006-11-14 | Sonion Nederland B.V. | Electret assembly for a microphone having a backplate with improved charge stability |
KR20060069427A (ko) * | 2003-07-22 | 2006-06-21 | 도호 카세이 가부시키가이샤 | 내열성 일렉트릿용 재료 및 내열성 일렉트릿 |
KR100549189B1 (ko) * | 2003-07-29 | 2006-02-10 | 주식회사 비에스이 | Smd가능한 일렉트렛 콘덴서 마이크로폰 |
-
2004
- 2004-08-06 JP JP2004230407A patent/JP2006050385A/ja active Pending
-
2005
- 2005-08-04 CN CNA2005800046729A patent/CN1918943A/zh active Pending
- 2005-08-04 WO PCT/JP2005/014333 patent/WO2006013940A1/ja active Application Filing
- 2005-08-04 KR KR1020067016235A patent/KR20070038449A/ko not_active Application Discontinuation
- 2005-08-04 US US10/589,281 patent/US7590252B2/en not_active Expired - Fee Related
- 2005-08-04 EP EP05768599A patent/EP1775992A4/en not_active Withdrawn
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH09283373A (ja) * | 1996-04-15 | 1997-10-31 | Matsushita Electric Works Ltd | シリコン酸化膜エレクトレット |
JP2002125297A (ja) * | 2000-10-17 | 2002-04-26 | Toho Kasei Kk | エレクトレット用積層板 |
JP2003199197A (ja) * | 2001-12-13 | 2003-07-11 | Bse Co Ltd | 超高電荷保存特性を有する多層エレクトレット及びその製造方法 |
JP2003259493A (ja) * | 2002-02-27 | 2003-09-12 | Star Micronics Co Ltd | エレクトレットコンデンサマイクロホン |
JP2004166262A (ja) * | 2002-10-23 | 2004-06-10 | Matsushita Electric Ind Co Ltd | 電気音響変換器及びその製造方法 |
Non-Patent Citations (1)
Title |
---|
See also references of EP1775992A4 * |
Also Published As
Publication number | Publication date |
---|---|
EP1775992A4 (en) | 2010-08-18 |
KR20070038449A (ko) | 2007-04-10 |
US20070160247A1 (en) | 2007-07-12 |
EP1775992A1 (en) | 2007-04-18 |
US7590252B2 (en) | 2009-09-15 |
JP2006050385A (ja) | 2006-02-16 |
CN1918943A (zh) | 2007-02-21 |
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