US3652810A - Microphone having a protective cap - Google Patents

Microphone having a protective cap Download PDF

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Publication number
US3652810A
US3652810A US31863A US3652810DA US3652810A US 3652810 A US3652810 A US 3652810A US 31863 A US31863 A US 31863A US 3652810D A US3652810D A US 3652810DA US 3652810 A US3652810 A US 3652810A
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US
United States
Prior art keywords
transducer
particles
cover
microphone
sound
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US31863A
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English (en)
Inventor
Bernhard Weingartner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
AKG Acoustics GmbH
Original Assignee
AKG Akustische und Kino Geraete GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by AKG Akustische und Kino Geraete GmbH filed Critical AKG Akustische und Kino Geraete GmbH
Application granted granted Critical
Publication of US3652810A publication Critical patent/US3652810A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens

Definitions

  • a microphone includes a microphone housing having a sound transducer therein.
  • a cover of substantially cup'shaped con- Foreign Application Priority Data figuration fits over one end of the housing above the trans ducer and it is made of a material which comprises a plurality Apr.
  • This invention relates in general to microphone construction and in particular to a new and useful microphone housing and cover construction and to an improved microphone cover composed of three-dimensional particles which are sintered together.
  • Microphones are usually provided with a protective cover which protects the thin and extremely delicate diaphragms of the transducer system from mechanical damage and prevents penetration of dust and dirt particles into the transducer system.
  • Such covers are usually made up of a plurality of separate part elements which are fitted together; for example, they usually include a rigid part or mechanical protection and a filter element consisting of a very fine meshed wire or gauze fabric for the protection of the transducer system from dirt and similar impurities.
  • the mechanical protection part may require a considerable manufacturing expense and may comprise, for example, a thick stiff wire formed into a hemispherical structure or a hollow body of plastic or metal material which is formed with sound inlet apertures.
  • a further layer which comprises a sound permeable material such as a foamed plastic or nonwoven textile or the like which also affords protection against Wind.
  • a sound permeable material such as a foamed plastic or nonwoven textile or the like which also affords protection against Wind.
  • these covers have the disadvantage that iron particles may penetrate into the microphones and interfere with the function thereof especially if they become deposited in the narrow gap of the microphone, particularly in electrodynamic microphone, particularly in electrodynamic microphones which have a working air gap permeated by a very strong magnetic field.
  • the disadvantages of the prior art are overcome by providing a cover which is formed of a sintered material having particles of spherical or irregular shape which are formed together into a single cover element, which is capable of performing all of the functions required for protection and operation of the microphone.
  • the sintered material of the cover comprises preferably metallic particles such as spherical bronze particles about 0.7 to l millimeter in diameter.
  • a sintered plastic material comprising spherical particles of thermoplastic material which are partially sintered together.
  • the wall thickness of the protective cover should not exceed twice the diameter ofa spherical particle of the sintered material.
  • a cover made up of sintered particles constructed in accordance with the invention provides an extremely high mechanical stability as well as a pleasing appearance in spite of its great strength. When the particles are sintered together into a cover construction, they have a sufficient spacing for sound permeability, but they define a tortuous and long path for the flow of impurities with the inflow passage being regularly curved and provided with corner spaces where the impurities will deposit before they can enter into the microphones.
  • a further advantage is that since the sound waves must also traverse a relatively long path into the transducer portions of the microphone there is an inherently good protection of the microphone from the effects of wind.
  • a further object of the invention is to provide a microphone cover which is made up of sintered particles such as spherical bronze particles of from 0.7 to 1 millimeter in diameter, plastic particles and the like, which provides a safe protection of the microphone from dust and impurities and which provides for satisfactory sound transmissions.
  • a further object of the invention is to provide a microphone cover and a microphone cover and housing construction which are simple in design, economical to manufacture and rugged in construction.
  • the invention embodied therein includes a microphone housing generally designated 1 which is of tubular configuration and includes an upper flared portion 3.
  • the upper flared portion 3 includes an internal annular recessed portion 3a defining a ledge 7 which forms an annular seat for a transducer assembly generally designated 2.
  • the transducer assembly 2 includes a collar portion 8 having a top bevel 8a and a bottom bevel 8b.
  • the bottom bevel portion 8b fits into the recess 3a and conforms to the side walls of the recess 30 and the microphone transducer assembly 2 rests on the ledge portion 7.
  • the housing is formed in a simple manner so that the transducer assembly 2 may be positioned on the groove 7 and secured in position such as with securing bolts 6 which extend through the wall of the flared portion 3 into the collar 8.
  • the microphone includes a unitary construction cover or cap 5 which is made up of a plurality of particles, preferably metallic particles such as spherical bronze particles of from 0.7 to 1 millimeter in diameter, which are sintered or fused together.
  • the cover 5 is made of a cupshaped configuration and it has a top wall 5t which is sound permeable and internal walls 5a and 5b which are of the same slope as the bevelled portion 8a of the collar 8 so that the cover may be easily positioned thereover.
  • the cover 5 of a sintered plastic material such as spherical particles of thermoplastic material.
  • the wall thickness of the protective cover could not exceed twice the diameter of a spherical particle of the sintered material which is used to make the cover.
  • sintering is used in this specification to indicate a caking together of material particles at elevated temperatures and is generally used to be synonymous with the term fused which is also employed herein.
  • the protective cover 5 may be matched to various housing materials by suitable surface finishing treatments such as anodizing, electroplating, etc.
  • suitable surface finishing treatments such as anodizing, electroplating, etc.
  • the materials employed may be of different colors.
  • the sintered material which constitutes at least the top 5: of the protective cover 5 and advantageously also the side walls 5a and 5b must be permeable to sound so that the sound will be transmitted through the cover without any modification. This is achieved through the multiplicity of passages which are formed between the sintered particles. Because of the sintered structure of the cover 5, these passages are nonlinear so that they will not permit a laminar flow of air through the cover.
  • the particles which are sintered together may be spherical or may have an irregular shape.
  • the protective cover 5 has various advantages over covers of other types. It has an extremely high mechanical stability and a pleasing appearance in spite of its high strength.
  • path to be traversed by any impurities which would tend to enter through the protective cover 5 will be much longer than a corresponding path, for example, in a well known protecting device such as a gauze shield, for example.
  • the path defined between adjacent particles which are sintered together is irregularly curved and is provided with corner spaces or dead areas which trap any impurities and insure that they cannot inflict damage.
  • the fact that sound must traverse the protective cover along a relatively long path provides a good protection against wind interference.
  • a dynamic microphone construction comprising a microphone housing, a dynamic sound transducer mounted in said housing, and substantially acoustically neutral shielding means for protecting the transducer and for minimizing the effect on the acoustic response of said transducer to sound outside the shielding means, said shielding means forming a cover for said housing extending over said sound transducer, said cover being of unitary construction and made up of a plurality of three dimensional particles sintered together and defining tortuous passages therebetween and defining at least one sound permeable wall portion adjacent said transducer; said cover, with said sound transducer, defining a large volume air space, and being spaced from said transducer; said cover being self supporting, the sintered particles defining tortuous sound wave air passages to trap impurities and to protect against wind effects.
  • a microphone according to claim 1 in which said three dimensional particles are substantially spherical.
  • a microphone according to claim 1 in which said three dimensional particles have an irregular shape.
  • said housing is substantially tubular and includes an upwardly and outwardly flaring tip portion, said upwardly flaring portion having an internal annular recess defining an annular ledge at the bottom of said recess, a transducer assembly supported on said ledge, said transducer assembly including a collar having a bevelled edge complementary to the surface of said recess and further including an upwardly and an inwardly bevelled top edge, said cover including a flat top portion and two divergent side wall portions, said side wall portions having a slope complementary to the bevelled top edge of said annular ring of said transducer and fitting therearound.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)
US31863A 1965-04-23 1970-05-01 Microphone having a protective cap Expired - Lifetime US3652810A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
AT374265A AT252343B (de) 1965-04-23 1965-04-23 Schutzkappe für Mikrophone

Publications (1)

Publication Number Publication Date
US3652810A true US3652810A (en) 1972-03-28

Family

ID=3554774

Family Applications (1)

Application Number Title Priority Date Filing Date
US31863A Expired - Lifetime US3652810A (en) 1965-04-23 1970-05-01 Microphone having a protective cap

Country Status (4)

Country Link
US (1) US3652810A (de)
AT (1) AT252343B (de)
DE (1) DE1290978C2 (de)
GB (1) GB1102306A (de)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987258A (en) * 1974-04-30 1976-10-19 Matsushita Electric Industrial Co., Ltd. Water-proof sound apparatus
US4065648A (en) * 1976-10-12 1977-12-27 The Astatic Corporation Microphone screen
FR2546702A1 (fr) * 1983-05-26 1984-11-30 Akg Akustische Kino Geraete Coussin auriculaire pour casque-ecouteur
EP0130400A2 (de) * 1983-06-30 1985-01-09 International Business Machines Corporation Mikrophon
US4600077A (en) * 1985-01-25 1986-07-15 Drever Leslie C Microphone wind shroud
US6412594B1 (en) 1999-10-05 2002-07-02 Shoot The Moon Products Ii, Llc Water gun with sound effects module
WO2007132176A1 (en) * 2006-05-12 2007-11-22 Audiogravity Holdings Limited Wind noise rejection apparatus
WO2008099200A1 (en) * 2007-02-16 2008-08-21 Audiogravity Holdings Limited Wind noise rejection apparatus
US20090288909A1 (en) * 2008-05-21 2009-11-26 Cooper Technologies Company Sintered elements and associated systems
US20100284150A1 (en) * 2009-05-05 2010-11-11 Cooper Technologies Company Explosion-proof enclosures with active thermal management using sintered elements
US9863718B2 (en) 2009-05-14 2018-01-09 Cooper Technologies Company Explosion-proof enclosures with active thermal management by heat exchange
US20220268800A1 (en) * 2019-09-26 2022-08-25 Molex, Llc Hybrid sensor assembly for use with active noise cancellation

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE602006012030D1 (de) * 2005-03-30 2010-03-18 Audiogravity Holdings Ltd Vorrichtung zur Unterdrückung von Windgeräuschen
CN110719539A (zh) * 2019-10-23 2020-01-21 中国航天空气动力技术研究院 一种应用于低噪声反射的传声器支架安装转接头

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444620A (en) * 1944-06-23 1948-07-06 Brush Dev Co Damping means for mechanical vibratory devices
US2556168A (en) * 1946-10-02 1951-06-12 Int Standard Electric Corp Microphone waterproofing device
US2702318A (en) * 1951-01-10 1955-02-15 Astatic Corp Unidirectional microphone
US3236328A (en) * 1962-06-27 1966-02-22 Electro Voice Acoustical device with protective screen

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2444620A (en) * 1944-06-23 1948-07-06 Brush Dev Co Damping means for mechanical vibratory devices
US2556168A (en) * 1946-10-02 1951-06-12 Int Standard Electric Corp Microphone waterproofing device
US2702318A (en) * 1951-01-10 1955-02-15 Astatic Corp Unidirectional microphone
US3236328A (en) * 1962-06-27 1966-02-22 Electro Voice Acoustical device with protective screen

Cited By (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3987258A (en) * 1974-04-30 1976-10-19 Matsushita Electric Industrial Co., Ltd. Water-proof sound apparatus
US4065648A (en) * 1976-10-12 1977-12-27 The Astatic Corporation Microphone screen
FR2546702A1 (fr) * 1983-05-26 1984-11-30 Akg Akustische Kino Geraete Coussin auriculaire pour casque-ecouteur
EP0130400A2 (de) * 1983-06-30 1985-01-09 International Business Machines Corporation Mikrophon
EP0130400A3 (de) * 1983-06-30 1986-02-19 International Business Machines Corporation Mikrophon
US4600077A (en) * 1985-01-25 1986-07-15 Drever Leslie C Microphone wind shroud
US6412594B1 (en) 1999-10-05 2002-07-02 Shoot The Moon Products Ii, Llc Water gun with sound effects module
US6752238B2 (en) 1999-10-05 2004-06-22 Shoot The Moon Products 11, Llc Water resistant audible toys with sound effects
WO2007132176A1 (en) * 2006-05-12 2007-11-22 Audiogravity Holdings Limited Wind noise rejection apparatus
US8391529B2 (en) 2006-05-12 2013-03-05 Audio-Gravity Holdings Limited Wind noise rejection apparatus
US20090310797A1 (en) * 2006-05-12 2009-12-17 David Herman Wind noise rejection apparatus
CN101444107B (zh) * 2006-05-12 2016-04-06 音频重力控股有限公司 风噪声去除装置
KR101422863B1 (ko) 2006-05-12 2014-07-24 오디오그래비티 홀딩스 리미티드 전자음향 트랜스듀서 장치, 트랜스듀서 모듈, 카메라, 휴대용 통신 장치, 보청기 및 기록 장치
WO2008099200A1 (en) * 2007-02-16 2008-08-21 Audiogravity Holdings Limited Wind noise rejection apparatus
US20100128901A1 (en) * 2007-02-16 2010-05-27 David Herman Wind noise rejection apparatus
US20100166215A1 (en) * 2007-02-16 2010-07-01 David Herman Wind noise rejection apparatus
US20090288909A1 (en) * 2008-05-21 2009-11-26 Cooper Technologies Company Sintered elements and associated systems
US7938223B2 (en) * 2008-05-21 2011-05-10 Cooper Technologies Company Sintered elements and associated systems
US8512430B2 (en) 2009-05-05 2013-08-20 Cooper Technologies Company Explosion-proof enclosures with active thermal management using sintered elements
US8992649B2 (en) 2009-05-05 2015-03-31 Cooper Technologies Company Explosion-proof enclosures with active thermal management using sintered elements
US20100284150A1 (en) * 2009-05-05 2010-11-11 Cooper Technologies Company Explosion-proof enclosures with active thermal management using sintered elements
US9863718B2 (en) 2009-05-14 2018-01-09 Cooper Technologies Company Explosion-proof enclosures with active thermal management by heat exchange
US20220268800A1 (en) * 2019-09-26 2022-08-25 Molex, Llc Hybrid sensor assembly for use with active noise cancellation

Also Published As

Publication number Publication date
GB1102306A (en) 1968-02-07
AT252343B (de) 1967-02-10
DE1290978B (de) 1969-03-20
DE1290978C2 (de) 1976-10-07

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