US3381773A - Acoustic resistance - Google Patents
Acoustic resistance Download PDFInfo
- 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
Links
- 239000002184 metal Substances 0.000 description 19
- 229910052751 metal Inorganic materials 0.000 description 19
- 239000000463 material Substances 0.000 description 8
- 229920003002 synthetic resin Polymers 0.000 description 8
- 239000000057 synthetic resin Substances 0.000 description 8
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000005245 sintering Methods 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Images
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
- H04R1/20—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.
Landscapes
- 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)
- Exhaust Silencers (AREA)
- Details Of Audible-Bandwidth Transducers (AREA)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
NL6604150A NL6604150A (xx) | 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 (xx) |
AT (1) | AT271590B (xx) |
BE (1) | BE696354A (xx) |
DE (1) | DE1512735B2 (xx) |
FR (1) | FR1515775A (xx) |
GB (1) | GB1130661A (xx) |
NL (1) | NL6604150A (xx) |
Cited By (10)
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)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE3102870A1 (de) * | 1981-01-29 | 1982-08-19 | Hans-Joachim 3300 Braunschweig Gieger | Gehaeuselautsprecher |
Citations (7)
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 |
US3163255A (en) * | 1963-04-04 | 1964-12-29 | Air Mite Devices Inc | Exhaust valve silencer with sintered metal silencing disc |
US3163256A (en) * | 1962-06-06 | 1964-12-29 | Corning Glass Works | Muffler with ceramic honeycomb baffle |
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 |
-
1966
- 1966-03-30 NL NL6604150A patent/NL6604150A/xx unknown
-
1967
- 1967-02-21 US US617543A patent/US3381773A/en not_active Expired - Lifetime
- 1967-03-23 DE DE1512735A patent/DE1512735B2/de active Pending
- 1967-03-28 AT AT293467A patent/AT271590B/de active
- 1967-03-28 GB GB13975/67A patent/GB1130661A/en not_active Expired
- 1967-03-30 FR FR100831A patent/FR1515775A/fr not_active Expired
- 1967-03-30 BE BE696354D patent/BE696354A/xx unknown
Patent Citations (7)
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)
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 |
---|---|
NL6604150A (xx) | 1967-10-02 |
DE1512735A1 (de) | 1969-05-14 |
AT271590B (de) | 1969-06-10 |
GB1130661A (en) | 1968-10-16 |
FR1515775A (fr) | 1968-03-01 |
DE1512735B2 (de) | 1975-02-20 |
BE696354A (xx) | 1967-10-02 |
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