US3381773A - Acoustic resistance - Google Patents

Acoustic resistance Download PDF

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Publication number
US3381773A
US3381773A US617543A US61754367A US3381773A US 3381773 A US3381773 A US 3381773A US 617543 A US617543 A US 617543A US 61754367 A US61754367 A US 61754367A US 3381773 A US3381773 A US 3381773A
Authority
US
United States
Prior art keywords
acoustic resistance
ring
tube
grains
acoustic
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
US617543A
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English (en)
Inventor
Schenkel Gerrit
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.)
US Philips Corp
North American Philips Co Inc
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US Philips Corp
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 US Philips Corp filed Critical US Philips Corp
Application granted granted Critical
Publication of US3381773A publication Critical patent/US3381773A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • 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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 

Definitions

  • the invention relates to an acoustic resistance for use in a device for converting acoustic vibrations into electric waves. More particularly, the invention relates to an acoustic resistance comprising a plurality of adjacent sintered metal grains contained in a supporting body and held together by the supporting body.
  • Such resistances are frequently used in microphones. They consist of a plurality of grains baked together by sintering. However, it is common practice hitherto to press the sintered grains in the form of an assembly into apertures in a mechanically hard material, such as iron or brass. These apertures are then completely filled by the grains. A disadvantage of this practice consists in that the grains are mechanically deformed when pressed into this material. As a result, the acoustic resistance value is also varied.
  • the invention is characterized in that the supporting body consists of a resilient synthetic resin.
  • the supporting body has the form of a ring into which the sintered grains are pressed.
  • these rings can be slipped, for example, into a tube which is mounted afterwards in a microphone.
  • various types of microphones can be provided with different tubular acoustic resistances.
  • FIGS. 1 and 2 are cross-sectional views of acoustic resistances in accordance with the invention.
  • FIG. 3 is a longitudinal sectional view of a tube comprising a plurality of acoustic resistances.
  • a ring 2 of synthetic resin is secured on a steel ring 1.
  • the ring 2 has several apertures 4 in which acoustic resistances are provided which have the form of sintered metal grains 3.
  • FIG. 2 shows another embodiment in which a metal tube with a flange 5 is provided on the inner side with a plastic tube 6.
  • the tube 6 in turn is provided with an acoustic resistance 7 consisting of sintered metal grains.
  • a metal tube 10 is provided with several acoustic resistance units axially arranged in the tube at the required places.
  • Each acoustic resistance unit consists of a plastic tube 11 in which an acoustic resistance 12 composed of sintered metal grains is provided.
  • An acoustic resistance member for use in an electroacoustic microphone comprising, a support body composed of a resilient synthetic resin material having an opening therein, and a plurality of adjacent sintered metal grains pressed together within said opening and held together by said support body so as to produce little or no deformation of the metal grains.
  • an acoustic resistance member comprising an elongate tube, a plurality of other tubes composed of a resilient synthetic resin material and mounted within said elongate tube in axially spaced relation, each of said resilient tubes being at least partially filled with a plurality of sintered metal grains pressed together within the tube and held together thereby.
  • an acoustic resistance member comprising an elongate metal tube, a plurality of ring-shaped members composed of a resilient plastic material and coaxially mounted within said tube in axially spaced relation, each of said rings containing a plurality of sintered metal grains pressed together within the ring and held together thereby.
  • An acoustic resistance member for use in an elec troacoustic microphone comprising, a metal ring-shaped member having an aperture therein, a second ring-shaped member coaxially secured to said metal ring and composed of a resilient plastic material, said second ring having an opening therein aligned with said aperture and containing a plurality of sintered metal grains held together by the plastic member.
  • a method of forming an acoustic resistance within. an aperture of a support body composed of a resilient synthetic resin material comprising the following steps, sintering a plurality of metal grains together, and pressing said sintered metal grains into the aperture in said resilient support body.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Exhaust Silencers (AREA)
US617543A 1966-03-30 1967-02-21 Acoustic resistance Expired - Lifetime US3381773A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL6604150A NL6604150A (de) 1966-03-30 1966-03-30

Publications (1)

Publication Number Publication Date
US3381773A true US3381773A (en) 1968-05-07

Family

ID=19796133

Family Applications (1)

Application Number Title Priority Date Filing Date
US617543A Expired - Lifetime US3381773A (en) 1966-03-30 1967-02-21 Acoustic resistance

Country Status (7)

Country Link
US (1) US3381773A (de)
AT (1) AT271590B (de)
BE (1) BE696354A (de)
DE (1) DE1512735B2 (de)
FR (1) FR1515775A (de)
GB (1) GB1130661A (de)
NL (1) NL6604150A (de)

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515240A (en) * 1967-09-28 1970-06-02 Matsushita Electric Ind Co Ltd Microphone device
US3930560A (en) * 1974-07-15 1976-01-06 Industrial Research Products, Inc. Damping element
US4837833A (en) * 1988-01-21 1989-06-06 Industrial Research Products, Inc. Microphone with frequency pre-emphasis channel plate
US20090274329A1 (en) * 2008-05-02 2009-11-05 Ickler Christopher B Passive Directional Acoustical Radiating
US20100034411A1 (en) * 2008-08-08 2010-02-11 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US8615097B2 (en) 2008-02-21 2013-12-24 Bose Corportion Waveguide electroacoustical transducing
US9078063B2 (en) 2012-08-10 2015-07-07 Knowles Electronics, Llc Microphone assembly with barrier to prevent contaminant infiltration
US20150382102A1 (en) * 2014-06-27 2015-12-31 Kabushiki Kaisha Audio-Technica Dynamic microphone and method of forming back-side air chamber
US9451355B1 (en) 2015-03-31 2016-09-20 Bose Corporation Directional acoustic device
US10057701B2 (en) 2015-03-31 2018-08-21 Bose Corporation Method of manufacturing a loudspeaker

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3102870A1 (de) * 1981-01-29 1982-08-19 Hans-Joachim 3300 Braunschweig Gieger Gehaeuselautsprecher

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152205A (en) * 1937-03-18 1939-03-28 Ingersoll Rand Co Muffler
US2576610A (en) * 1944-04-10 1951-11-27 Gen Motors Corp Restricter
US3115207A (en) * 1954-01-11 1963-12-24 Electro Voice Unidirectional microphone
US3163256A (en) * 1962-06-06 1964-12-29 Corning Glass Works Muffler with ceramic honeycomb baffle
US3163255A (en) * 1963-04-04 1964-12-29 Air Mite Devices Inc Exhaust valve silencer with sintered metal silencing disc
US3270834A (en) * 1965-09-10 1966-09-06 Atlas Copco Ab Pneumatic tool having exhaust noise reducing means
US3293379A (en) * 1961-01-17 1966-12-20 Gorike Rudolf Earphone

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2152205A (en) * 1937-03-18 1939-03-28 Ingersoll Rand Co Muffler
US2576610A (en) * 1944-04-10 1951-11-27 Gen Motors Corp Restricter
US3115207A (en) * 1954-01-11 1963-12-24 Electro Voice Unidirectional microphone
US3293379A (en) * 1961-01-17 1966-12-20 Gorike Rudolf Earphone
US3163256A (en) * 1962-06-06 1964-12-29 Corning Glass Works Muffler with ceramic honeycomb baffle
US3163255A (en) * 1963-04-04 1964-12-29 Air Mite Devices Inc Exhaust valve silencer with sintered metal silencing disc
US3270834A (en) * 1965-09-10 1966-09-06 Atlas Copco Ab Pneumatic tool having exhaust noise reducing means

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3515240A (en) * 1967-09-28 1970-06-02 Matsushita Electric Ind Co Ltd Microphone device
US3930560A (en) * 1974-07-15 1976-01-06 Industrial Research Products, Inc. Damping element
US4837833A (en) * 1988-01-21 1989-06-06 Industrial Research Products, Inc. Microphone with frequency pre-emphasis channel plate
US8615097B2 (en) 2008-02-21 2013-12-24 Bose Corportion Waveguide electroacoustical transducing
USRE46811E1 (en) 2008-05-02 2018-04-24 Bose Corporation Passive directional acoustic radiating
US20090274329A1 (en) * 2008-05-02 2009-11-05 Ickler Christopher B Passive Directional Acoustical Radiating
US20110026744A1 (en) * 2008-05-02 2011-02-03 Joseph Jankovsky Passive Directional Acoustic Radiating
US20120237070A1 (en) * 2008-05-02 2012-09-20 Ickler Christopher B Passive Directional Acoustic Radiating
US8351630B2 (en) 2008-05-02 2013-01-08 Bose Corporation Passive directional acoustical radiating
US8358798B2 (en) * 2008-05-02 2013-01-22 Ickler Christopher B Passive directional acoustic radiating
US8447055B2 (en) 2008-05-02 2013-05-21 Bose Corporation Passive directional acoustic radiating
USRE48233E1 (en) 2008-05-02 2020-09-29 Bose Corporation Passive directional acoustic radiating
US20100034411A1 (en) * 2008-08-08 2010-02-11 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US8630435B2 (en) * 2008-08-08 2014-01-14 Nokia Corporation Apparatus incorporating an adsorbent material, and methods of making same
US9078063B2 (en) 2012-08-10 2015-07-07 Knowles Electronics, Llc Microphone assembly with barrier to prevent contaminant infiltration
US20150382102A1 (en) * 2014-06-27 2015-12-31 Kabushiki Kaisha Audio-Technica Dynamic microphone and method of forming back-side air chamber
US9584902B2 (en) * 2014-06-27 2017-02-28 Kabushiki Kaisha Audio-Technica Dynamic microphone and method of forming back-side air chamber
US9451355B1 (en) 2015-03-31 2016-09-20 Bose Corporation Directional acoustic device
US10057701B2 (en) 2015-03-31 2018-08-21 Bose Corporation Method of manufacturing a loudspeaker

Also Published As

Publication number Publication date
GB1130661A (en) 1968-10-16
FR1515775A (fr) 1968-03-01
AT271590B (de) 1969-06-10
DE1512735B2 (de) 1975-02-20
NL6604150A (de) 1967-10-02
DE1512735A1 (de) 1969-05-14
BE696354A (de) 1967-10-02

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