Condenser Microphone
Condenser microphone having resistance against high temperature
Condenser microphone utilizable at high temperature and intense radioactive rays. The microphone has a tension ring and a backplate, both of which are made of a metal having a small coefficient of linear expansion relative to the other parts of the microphone. The tension ring is fitted to a tension ring holder, and the backplate is mounted on the tension ring holder through an insulating material so that the tension ring and the backplate are held together to form a unitary structure.
The microphone of the piezo-electric ceramic type, however, has a sensitivity of as low as -105 to -120 dB under the conditions of a high-temperature atmosphere. Therefore, the microphone of the piezo-electric ceramic type is not capable ofdetecting sound of small levels when it is used in a high-temperature atmosphere condition. Microphones of other types are not utilizable at high temperatures as a matter of course. Therefore, the conventional microphones are not capable of detectingsound of small levels when they are used as sensors under high-temperature atmosphere conditions.
An object of the present invention is to solve the above-mentioned problems inherent to the conventional art.Another object of the present invention is to provide an improved condenser microphone which can be used under the conditions of high temperature and radioactive rays.Another object of the present invention is to provide an improved microphone which is capable of detecting sound of small levels under the condition of high temperature.According to the present invention, there is provided a condenser microphone having resistance against high temperature and radioactive rays.
The microphone has a first cylindrical body having a bottom end member at its one end, a second cylindrical body threadedly engaged at its one end to the other end of the first cylindrical body, ring means threadedly engaged with the other end ofthe second cylindrical body, a vibration membrane fixed at its circumferential end to the ring means, and microphone structural body threadedly engaged with an inner surface of the second cylindrical body.
The microphone structural body has tensionmeans for imparting a tension to the vibration membrane, a backplate which has an upper surface spaced from the vibration membrane, and an insulator between the tension means and the backplate so that a unitary structure of the microphone structural bodyis formed. In the present invention, the tension means and the backplate are made of a metal having a small coefficient of linear expansion relative to the other elements such as the ring means and first and second cylindrical bodies.
In an embodiment of the invention, the tension means has a tension ring contacted with the vibration membrane, and a holder for holding the tension ring. The holder is threadedly engaged with the second cylindrical body and connected to thebackplate through the insulator. Preferably, the insulator is a glass insulator of aluminosilicate. In a further embodiment of the invention, the ring means has a first ring threadedly engaged with the aforementioned second cylindrical body and asecond ring fixed to the first ring with the circumferential end of the vibration membrane being secured firmly therebetween.
In a further preferred embodiment of the invention, the height from the upper end of the insulator to the upper end of thebackplate is set smaller by about 40 to 50 μm than the height from the upper end of the insulator to the upper end of the tension ring so that a gap of about 40 to 50 μm is maintained between the vibration membrane and the backplate when a tensionis imparted to the membrane by the tension ring.
According to the present invention, the tension imparted to the vibration membrane decreases as the temperature rises, and the effect of creep is restrained. Further, the gap changes very little between the vibration membrane and the backplateAccordingly, there is obtained a microphone which is highly sensitive and which exhibits good frequency characteristics under the conditions of high temperatures and intense radioactive rays. At a temperature of 300° C., for instance, themicrophone exhibits a sensitivity of -74. -.3 dB, and frequency characteristics of . -.5 dB over a range of 500 to 10 KHz. Therefore, the present invention makes it possible to detect low amplitude sounds that could not be detected so far under hightemperature atmosphere conditions.
While condenser microphone has been described with respect to a preferred embodiment, it should be apparent to those skilled in the art that numerous modifications may be made thereto without departing from the spirit and scope of the invention.
About the Author
Ningbo Tongxin Microphones offers the best variety of quality Condenser Microphone for Studio, Podcast, USB, Instrumen, Conference, Broadcast and Field Recording.
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Blue bird Condenser Wireless Professional Microphone $175.00 |
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CAD Pro Studio Condenser Microphone Mic CD-GXL3000 $144.95 |
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Shure SM27 Multi-Purpose Condenser Microphone SM27SC $349.95 |
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Sony ECM88B Electret Condenser Lavalier Microphone NEW $579.00 |
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CAD E300S Condenser Variable Pattern Microphone CAD AS32 Stedman Proscreen XL $399.99 |
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Audix Drum microphones – Vocal condenser mic – VX5 Microphone $289.95 |
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Samson GO MIC Portable USB Professional Condenser Podcasting Microphone/Mic $42.99 |
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Miscellaneous Condenser Microphone *PROJECT* $20.50 |
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CAD e300S Large Diaphragm Multi-Pattern Condenser Microphone $349.00 |
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CAD e70 Modular Dual Capsule Condenser Microphone $139.00 |
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CAD GXL1200 Small Diaghragm Condenser Microphone $69.99 |
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CAD GXL2200 Large Diameter Condenser Microphone $79.99 |
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CAD GXL3000 Multi-pattern Condenser Microphone $119.99 |
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CAD M9 Tube Condenser Microphone w/ Case & Shock Mount $259.00 |
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Sennheiser e965 Handheld Condenser Vocal Microphone w Touring Boom Mic Stand NEW $699.99 |
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Audix SCX25-A LgDiaphragm Condenser Microphone Cardioid Shock-Mounted Capsule $695.00 |
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AKG CK-77WR Condenser Lavalier Microphone $110.00 |
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CAD Audio U37 Condenser Plug-in Microphone $65.00 |
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ANGLED PRO MD MINIDISC ELECTRET CONDENSER MICROPHONE $20.89 |
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Peluso 22 47 Large Diaphragm Condenser Microphone, 2247 $1,199.99 |
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Shure PG27LC Side Address Condenser Multi-Purpose Microphone $154.95 |
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REALISTIC ELECTRET CONDENSER STEREO MICROPHONE $19.99 |
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Ramsa WM-S5 Condenser Drum Microphone WMS5 S5 Panasonic W/ Transformer Mic Clip $65.00 |
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Sony ECMDS30P ECM-DS30P Electret Condenser Microphone $38.55 |
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Audio Technica Atr-4697 Omnidirectional Condenser Boundary Microphone (atr4697) $26.96 |
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Audio Technica Atr-6250 Stereo Condenser Vocal/recording Microphone (atr6250) $41.87 |
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Audix F15 Condenser Cable Professional Microphone $45.00 |
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Philips LBB9510 Cardioid Condenser microphone $95.00 |
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Philips B420 Cardioid Condenser handheld microphone(#2) $100.00 |
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Sony ECM-DS70P Electret Condenser Stereo Microphone $63.00 |
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Blue Microphones USB Mic Microphone-Four Pattern premium condenser capsules YETI $219.95 |
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Old Philips B420 Cardioid Condenser handheld microphone $100.00 |
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RW-MIC108A Digital Camera Electret Condenser Microphone w Pouch $47.12 |
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MXL V900 Stage and Studio Condenser Microphone $149.99 |
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Samson METEOR MIC (SAMTR) USB Professional Condenser Studio Microphone/Mic $88.87 |
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CAD Equitek E-200 Multi-pattern Condenser Microphone – bass – drums – guitar cab $200.00 |
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NEW Rode Broadcaster Large Diaphragm Cardioid Condenser Microphone with Mount $419.00 |
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MXL/Marshall Cardioid Condenser USB Mic Microphone USB006 $154.95 |
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RW-MIC108A Digital Camera Electret Condenser Microphone w Pouch $47.47 |
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Sony ECM-50PSW Electret Condenser Microphone FS16231 $9.99 |
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NEW Rode VIDEOMIC Camera Mountable Condenser Microphone, Integrated Shock Mount $149.00 |
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Audio-Technica U851A Cardioid Condenser Boundary Microphone – MINT!! $169.99 |
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Blue Mouse Condenser Cable Professional Microphone in mint condition! $650.00 |
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Rode Lavalier Condenser Microphone 3 pin XLR Plug NEW $260.56 |
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Rode Lavalier Condenser Lapel Microphone w/ Sennheiser Plug NEW $260.56 |
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Shure Condenser Microphone With XLR Cable, PG81-XLR $134.95 |
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Shure USB Microphone Bundle PG27USB USB Condenser Mic $189.95 |
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Samson Multipattern USB Condenser Microphone Model, C03UCW $156.95 |
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Samson G-Track USB Condenser Microphone, GM1U $156.95 |
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PH1 PHANTOM CONDENSER MIC OMNI RECORDING MICROPHONE $24.99 |
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Audio-Technica LG Diaphragm Condenser Microphone AT2035 $159.95 |
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Sennheiser e865 Condenser Supercardioid Vocal Microphone Audix PD133 Pop Filter $269.99 |
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Shure Cardiod Condenser Handheld Microphone, SM86 $186.95 |
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EV Electro Voice CP218 Condenser Cardioid Gooseneck Podium Microphone $147.97 |
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Rode NT1-A Condenser Microphone Bundle and Desktop Stand $145.50 |
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Rode K2 Condenser Professional Microphone-Excellent Condition $479.00 |
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Blue Microphones Spark Studio Condenser Microphone $199.00 |
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MXL 550/551R Condenser Microphone Ensemble Kit $179.95 |
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MXL 990 Condenser Professional Microphone $49.99 |
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MXL 3000 Condenser Cable Professional Microphone $90.95 |
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Blue Kiwi Large Diam Multi-Pattern Condenser Microphone $1,999.95 |
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Behringer B-5 Studio Condenser Microphone w/Capsules $75.99 |
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Blue Yeti Condenser Microphone $109.99 |
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Marshall Mxl-micmate Mic Mate[tm] Xlr To Usb Condenser Microphone Preamp $52.73 |
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Audio Technica AT4040 Audio-technica Cardioid Condenser Microphone $299.00 |
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Shure Microflex Overhead Cardoid Condenser Microphone Mic MX202B/C $229.95 |
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Blue Blueberry Large Diameter Condenser microphone Mic $999.00 |
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Behringer C-1 Studio Condenser Microphone $45.00 |
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Sennheiser e965 e 965 Vocal Condenser Microphone NEW $699.95 |
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MXL 990 Condenser Professional Microphone $21.50 |
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MXL/Marshall Studio Condenser Mic V88 microphone MXLV88 $279.95 |
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SONY ECM-HST1 ELECTRET CONDENSER CAMCORDER MICROPHONE $74.95 |
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18 Pcs Mini MIC Capsule Electret Condenser Microphone $8.96 |
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SHURE MX202 Microphone (185) w/Condenser & Neutrix connector $79.99 |
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UKNOWN BRAND CONDENSER MICROPHONE W/ CABLE AND CASE NO RESERVE!!! $15.50 |
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Vintage Sony Electret Condenser Microphone ECM 15P Storage Case Only $4.99 |
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DEMO ADK Hamburg Mk8 Mic Cardiod Condenser Microphone $269.95 |
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Shure SM81 Cardioid Condenser Instrument Microphone – NEW!!! $349.00 |
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Panasonic WM-61A Electret Condenser Microphone, 2PCS $6.99 |
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SONY ECM-16 Electret Condenser Microphone $15.99 |
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Shure USB Microphone Bundle PG42USB USB Condenser Mic $229.95 |
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Audix Drum microphones – Condenser cardioid – ADX51 Microphone Mic $249.95 |
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RODE NT1-A CONDENSER MICROPHONE $150.00 |
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Rode NTG-2 Condenser Cable Professional Microphone W/ Shotgun excellent cond. $212.50 |
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Avid M-Audio Sputnik Tube Condenser Microphone BRAND NEW $315.00 |
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Behringer C-1U Condenser Cable Professional Microphone $30.00 |
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MXL/Marshall large Diaphragm Condenser Microphone mic Class A MXL2008 $154.95 |
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CAD USB Condenser Microphone Mic CD-U37 computer plug-n-play $94.95 |
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Blue Dragonfly Cardioid Condenser Instrument Microphone $999.00 |
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SONY ECM-50PS ELECTRET CONDENSER MICROPHONE WITH ACCESSORIES – FREE SHIPPING $75.00 |
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Shure Lavalier Condenser Microphone Mic WL185 Cardioid – High rejection $144.95 |
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AKG Perception 220 Condenser microphone $92.00 |
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CAD Trion Audio 6000 Multi-Pattern Condenser Cable Pro Microphone w/ shock-mount $159.99 |
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Rode M3 Condenser Cable Pro Microphone w/ hard case, windscreen, and shock-mount $114.99 |
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Rode M3 Condenser Cable Pro Microphone w/ hard case, windscreen, and shock-mount $114.99 |
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Small Electret Condenser Microphone MIC Capsule 18 Pcs $5.74 |
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Audio-Technica AT897 Line Gradient Compact Condenser Microphone $81.00 |
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AUDIO TECHNICA ATM33a CONDENSER MICROPHONE $72.00 |
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Shure KSM137/SL Cardioid/ Condenser Instrument Microphone $159.50 |
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Audio-Technica AT2020 Condenser Cable Professional Microphone $50.00 |
