EP0543087A2 - Schutzvorrichtung für einen electroakustischen Wandler - Google Patents

Schutzvorrichtung für einen electroakustischen Wandler Download PDF

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Publication number
EP0543087A2
EP0543087A2 EP92113624A EP92113624A EP0543087A2 EP 0543087 A2 EP0543087 A2 EP 0543087A2 EP 92113624 A EP92113624 A EP 92113624A EP 92113624 A EP92113624 A EP 92113624A EP 0543087 A2 EP0543087 A2 EP 0543087A2
Authority
EP
European Patent Office
Prior art keywords
microphone
protection device
protective
polyethylene
sintered
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.)
Withdrawn
Application number
EP92113624A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0543087A3 (enrdf_load_stackoverflow
Inventor
Werner Haage
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.)
CLARSON APPARATEBAU GmbH
Original Assignee
CLARSON APPARATEBAU 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 CLARSON APPARATEBAU GmbH filed Critical CLARSON APPARATEBAU GmbH
Publication of EP0543087A2 publication Critical patent/EP0543087A2/de
Publication of EP0543087A3 publication Critical patent/EP0543087A3/xx
Withdrawn legal-status Critical Current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
    • H04R1/086—Protective screens, e.g. all weather or wind screens

Definitions

  • the invention relates to a protective device for an electroacoustic transducer, in particular a microphone capsule, made of a protective body made of sintered material which at least partially surrounds the electroacoustic transducer.
  • protective caps made of metallic sintered material for example sintered bronze. Due to their high mechanical strength, protective caps made of sintered metal offer good protection against damage to the microphone capsules, but on the other hand have unsatisfactory acoustic properties and are very expensive to produce.
  • the unsatisfactory acoustic properties are expressed, for example, in the occurrence of so-called pop noises when speaking into a microphone that is in the immediate vicinity of the mouth.
  • the known microphone protective caps tend to amplify wind noises due to their process-like, grainy, rough surface, which considerably deteriorate the recording quality achievable with the microphones.
  • the known protective caps are also characterized by an often disadvantageous labeling character in practice, which makes a microphone provided with such a protective cap recognizable from a distance. This exposure means that these sensitive devices can easily become victims of vandalism. Of course, this does not only apply to microphones, but also just as well to loudspeakers, whose sensitive membranes are provided with such protective caps.
  • the invention has for its object to provide a generic protection device for an electroacoustic transducer, which has improved acoustic properties and is inexpensive and can be manufactured with an inconspicuous exterior.
  • the protective body consists of fine-grained, sintered plastic.
  • Plastic can be processed much more easily and cost-effectively than metal in the sintering process.
  • the fine - grained plastic particles serving as the starting material can be leveled in the outer area of the sintered protective body by simple pressing, so that the protective body is provided with a smooth surface which does not provide any flow resistance as a prerequisite for the occurrence of wind noise.
  • the fine-grained, sintered plastic has a porous, open-cell structure that is permeable to air and thus also to airborne sound for the unimpeded passage of airborne sound waves through the protective body. Due to the much better damping properties compared to metal, structure-borne noise is largely absorbed, so that when the protective caps sintered from fine-grained plastic are used, the known pop noises do not occur.
  • plastic Compared to metal, plastic also offers the advantage that, in addition to the more cost-effective production in the sintering process, easy reshaping, easy reworking or coloring of the protective cap formed from plastic is also possible, so that an inconspicuous design of the protective cap exterior that is tailored to the environment is possible is easily possible. Since there is no metallic appearance in protective caps made of plastic, even without any aftertreatment, exposure of the protective caps is avoided from the start.
  • the versatile, easy-to-process engineering plastic, polyethylene is used as the plastic. Particularly good results with regard to the acoustic properties improved compared to the use of metal can be achieved with a composition of the sintered material from polyethylenes with different molecular properties. It has been found that a mixture of the sintered material made of an ultra-high molecular weight polyethylene, a so-called UHMWPE, and a high-density polyethylene, a so-called HDPE, is particularly suitable.
  • An improvement in the protective properties of the protective cap can be achieved by making the plastic material hydrophobic, which is possible by adding graphite to the plastic before the sintering process is carried out.
  • the water repellency makes it possible for the polyethylene, which is at least partially permeable to water vapor, to be water-permeable.
  • the graphite forms a firm chemical bond with the polyethylene, so that the water repellency is permanent.
  • Hydrophobization can also be achieved with sintered metal. However, this is done by impregnating the sintered metal with oil, which only creates an outer water-repellent coating that is not durable and has an adverse effect on the acoustic properties of the sintered metal.
  • the protective body is designed as a microphone capsule sleeve of a microphone.
  • the protective body and the housing represent one and the same component. Due to the good processing properties of the sintered plastic material, it is possible not only to manufacture the housing of the microphone but also, with the exception of the microphone capsule, all parts to be connected to the housing for mounting the microphone from the sintered plastic material.
  • connection of the microphone capsule 12 to an amplifier takes place via leads 20, 21 which are led out of the base housing 13 as an insulated connection cable 22.
  • the transition from the feed lines 20, 21 to the connecting cable 22 takes place via a plug connection, not shown here, which is secured by means of a union nut 23 on a threaded shoulder of the base housing 13, also not shown.
  • the protective cap 14 consists of a sintered, fine-grained polyethylene material.
  • the protective cap 14 has a substantially smooth surface after sintering, which, as already explained, counteracts the development of disturbing wind noises.
  • the smooth surface offers only a small deposit area for depositing dirt deposits that may impair the recording quality of the microphone capsule.
  • the smoothness of the surface of the protective cap 14 is achieved, as mentioned, on the one hand by the selection of particularly fine-grained sintered material, but on the other hand also promoted by the sintering process itself, in the course of which there is a slight melting of the particle surfaces of the sintered material, both of which together - Menaking the particles as well as smoothing the particle surfaces themselves. This surface smoothing is further supported by the compression molding in the sintering process.
  • the protective cap 14 produced in the sintering process therefore has a body with a porous, open-cell structure that allows airborne sound waves to pass through, and an outer smooth surface.
  • FIG. 2 shows, as a further exemplary embodiment of the invention, a microphone 24, the entire housing 25 of which is designed as a protective device according to the invention and consists of sintered polyethylene.
  • the housing insert 26 is at the same time designed as an intermediate piece which isolates structure-borne noise, which results in a total reduction in the number of individual parts required to form the microphone housing.
  • the microphone capsule 12 is inserted with its connecting pin 16 into a receptacle 29 of the housing insert 26 designed as an intermediate piece.
  • the connection cable 22 is plugged in via a plug connection of the feed lines 20, 21, not shown here, in the region of the connecting pin 16.
  • the embodiment of the protective device according to the invention shown in FIG. 2 is made possible by the high mechanical strength and the good machinability of the sintered polyethylene.
  • the low specific weight is particularly important of the sintered material, which overall leads to a particularly lightweight design of the microphone 24 and thus to improved handling properties.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
EP92113624A 1991-11-21 1992-08-10 Schutzvorrichtung für einen electroakustischen Wandler Withdrawn EP0543087A2 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE9114492U 1991-11-21
DE9114492U DE9114492U1 (de) 1991-11-21 1991-11-21 Schutzvorrichtung für einen elektroakustischen Wandler

Publications (2)

Publication Number Publication Date
EP0543087A2 true EP0543087A2 (de) 1993-05-26
EP0543087A3 EP0543087A3 (enrdf_load_stackoverflow) 1994-05-04

Family

ID=6873502

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92113624A Withdrawn EP0543087A2 (de) 1991-11-21 1992-08-10 Schutzvorrichtung für einen electroakustischen Wandler

Country Status (3)

Country Link
EP (1) EP0543087A2 (enrdf_load_stackoverflow)
JP (1) JPH05252583A (enrdf_load_stackoverflow)
DE (1) DE9114492U1 (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10009847A1 (de) * 2000-03-01 2001-09-13 Sennheiser Electronic Schutzgehäuse für Mikrofone
EP1230739A4 (en) * 1999-11-19 2007-09-26 Gentex Corp ACCESSORY MICROPHONE OF VEHICLE
US7443988B2 (en) 1999-11-19 2008-10-28 Gentex Corporation Vehicle accessory microphone
US7447320B2 (en) 2001-02-14 2008-11-04 Gentex Corporation Vehicle accessory microphone
US7616768B2 (en) 2001-02-14 2009-11-10 Gentex Corporation Vehicle accessory microphone having mechanism for reducing line-induced noise
US8350683B2 (en) 1999-08-25 2013-01-08 Donnelly Corporation Voice acquisition system for a vehicle
US8682005B2 (en) 1999-11-19 2014-03-25 Gentex Corporation Vehicle accessory microphone

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9114492U1 (de) * 1991-11-21 1992-01-30 Clarson Apparatebau GmbH, 7735 Dauchingen Schutzvorrichtung für einen elektroakustischen Wandler
JP4724410B2 (ja) * 2004-11-19 2011-07-13 株式会社オーディオテクニカ コンデンサマイクロホン
KR101119521B1 (ko) * 2009-10-20 2012-02-28 대경 아이티(주) 스피커 하우징 및 그 제조방법
JP6421358B2 (ja) * 2015-01-22 2018-11-14 株式会社オーディオテクニカ マイクロホンおよびマイクロホンのヘッドケース

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6153338A (ja) * 1984-08-23 1986-03-17 Japan Styrene Paper Co Ltd 複合構造発泡成形体およびその製造法
US4600077A (en) * 1985-01-25 1986-07-15 Drever Leslie C Microphone wind shroud
US4903249A (en) * 1988-03-24 1990-02-20 Nelson Industries Rigid foraminous microphone probe for acoustic measurement in turbulent flow
JPH02263867A (ja) * 1989-04-05 1990-10-26 Kanebo Ltd 熱可塑性樹脂組成物及び成形物の製造方法
JPH0341163A (ja) * 1989-07-10 1991-02-21 Nippon Kasei Kk 熱可塑性樹脂組成物
DE9114492U1 (de) * 1991-11-21 1992-01-30 Clarson Apparatebau GmbH, 7735 Dauchingen Schutzvorrichtung für einen elektroakustischen Wandler

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8350683B2 (en) 1999-08-25 2013-01-08 Donnelly Corporation Voice acquisition system for a vehicle
EP1230739A4 (en) * 1999-11-19 2007-09-26 Gentex Corp ACCESSORY MICROPHONE OF VEHICLE
US7443988B2 (en) 1999-11-19 2008-10-28 Gentex Corporation Vehicle accessory microphone
US8224012B2 (en) 1999-11-19 2012-07-17 Gentex Corporation Vehicle accessory microphone
US8682005B2 (en) 1999-11-19 2014-03-25 Gentex Corporation Vehicle accessory microphone
DE10009847A1 (de) * 2000-03-01 2001-09-13 Sennheiser Electronic Schutzgehäuse für Mikrofone
DE10009847C2 (de) * 2000-03-01 2002-10-02 Sennheiser Electronic Wetterschutzgehäuse für Mikrofone
US7447320B2 (en) 2001-02-14 2008-11-04 Gentex Corporation Vehicle accessory microphone
US7616768B2 (en) 2001-02-14 2009-11-10 Gentex Corporation Vehicle accessory microphone having mechanism for reducing line-induced noise

Also Published As

Publication number Publication date
EP0543087A3 (enrdf_load_stackoverflow) 1994-05-04
JPH05252583A (ja) 1993-09-28
DE9114492U1 (de) 1992-01-30

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