US2131593A - Acoustic device - Google Patents

Acoustic device Download PDF

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Publication number
US2131593A
US2131593A US99910A US9991036A US2131593A US 2131593 A US2131593 A US 2131593A US 99910 A US99910 A US 99910A US 9991036 A US9991036 A US 9991036A US 2131593 A US2131593 A US 2131593A
Authority
US
United States
Prior art keywords
case
diaphragm
transmitter
acoustic device
ribs
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
US99910A
Other languages
English (en)
Inventor
Robert N Marshall
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.)
AT&T Corp
Original Assignee
Bell Telephone Laboratories Inc
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
Priority to NL47966D priority Critical patent/NL47966C/xx
Application filed by Bell Telephone Laboratories Inc filed Critical Bell Telephone Laboratories Inc
Priority to US99910A priority patent/US2131593A/en
Priority to GB13106/37A priority patent/GB473878A/en
Priority to FR822144D priority patent/FR822144A/fr
Priority to CH201674D priority patent/CH201674A/fr
Application granted granted Critical
Publication of US2131593A publication Critical patent/US2131593A/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
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/222—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only  for microphones

Definitions

  • This invention relates to acoustic devices, and more particularly,-to transmitters.
  • An object of this invention is to improve the structure of transmitters, particularly of the electrodynamic or moving coil'type.
  • a feature of the invention comprises protecting the diaphragm of a transmitter against dam-. age or deformation likely to result from sudden or violent increases in pressure in front of the diaphragm.
  • a preferred embodiment of the invention comprises a transmitter having a case, substantially cylindrical and open'at each end.
  • One open end is constituted by a multi-aperture portion of the case.
  • Behind this open end is positioned a transmitter unit, preferably of the moving coil type having a diaphragm of a light-weight, high strength material, for example, of the order of .001 inch in thickness, although diaphragms as thin as .00025 inch may be used, and having a central stiffened dome-shaped portion and an outer annular flexible portion.
  • Ribs, ridges or raised portions are provided on the outer surface of the multi-aperture end of the case, and, preferably, extend radially outwardly from the center of the case end, increasing in height with shaped passages for the release of air pressure which may be produced at the case end by a sudden or violent movement of the hand, or an article or other member in its vicinity.
  • Fig. 1 is a perspective view of a transmitter embodying the invention and supp rted on a floor or desk stand;
  • Fig. 2 is a cross-sectional view of the transmitter of Fig. 1;
  • Fig. 3 is a front view of the transmitter of Fig. 1.
  • the open end I2 is closed by dish-shaped cover member l3 having a central opening ll.
  • the other and rounded end [5 contains a plurality of sound wave passingapertures IS, the inner ends of the apertures being covered by a thin strip of fabric ll to exclude dust orv other particles from the inside of the case.
  • the open end I5 is closed on the inside of the case by the diaphragm ll of the transdistance from the center and defining sector-
  • the transmitter in comprises a hollow case or mitter unit I9.
  • the unit i9 is preferably of the electrodynamicor moving coil type comprising a magnet structure including a central, circular pole member 2
  • the diaphragm comprises a central stiffened dome-shaped portion 24 and an outer annular flexible portion 25, secured, for example, by cement or adhesive, at its peripheral portion to the plate pole, the coil 23 being fastened to the diaphragm at the junction 26 of its central and outer portions.
  • the diaphragm is preferably of a light-weight, high strength material, for example, an aluminum alloy such as duralumin, about .001 inch or less in thickness. Diaphragms as thin as .00025 inch may be used.
  • the transmitter unit is maintained in position against the front end of the case by an externally threaded clamping ring 21 engaging with the threaded projections 28 on the inner surface of the case.
  • a terminal and closure plate mem-- ber 29, to which the cover member is fastened by screws 40, is "secured in the open end l2 by a clamping ring 30 threadedly engaging the case.
  • to which the transmitter unit leads 32 are .connected, are connected with an external electric circuit by the conductors 33 of a cord 34 that extends into the case through the hollow extension 35.
  • This extension forms a narrow annular sound wave, and air passage 36 with the cover member, connecting the chamber 31 formed by the cover member and member 29 with the atmosphere outside the case.
  • This chamber is connected with the air.
  • chamber 38 through an aperture (not-shown) in the member 29 and the elongated, restricted, tubular member 39 which may be of soft rubber. If desired, chamber 38 may be filled with loose cotton, wool or felt.
  • Sound waves have access to the front of the diaphragm through the apertures l6, and to the rear of the diaphragm through the passage 36, air chamber 31, tubular member 39,'air chamber 38, openings (not shown) in the magnet structure, and the air-gap.
  • a transmitter such as has been described is particularly adapted for use in sound picture, public address and broadcast systems. It receives considerable handling in the course of its manufacture, and, subsequently, additional handling and abuse in use. It has been found that it frequently happens that the hand, or an article or other member, is suddenly or violently placed across the aperture end of the case. This causes a sudden or violent forcing of air through the apertures l6 and into the chamber 4
  • the end l5 of the case is provided with raised portions, ridges or ribs 42, extending radially outwardly from the center, increasing in height with distance from the center of the case end, preferably three in number, spaced about degrees apart and forming sectorshaped spaces 43 for the flow of air and the release of pressure should something be suddenly or violently placed across the diaphragm end of the case.
  • the ribs are shown as an integral part of the case and strengthen the multi-aperture end thereof. It is obvious, however, that they may be formed separate from the case and attached thereto in any suitable manner. If desired, furthermore, the ribs may be burnished, polished'or colored so as to provide a contrast to the outer surface of the case, and a novel ornamental effect.
  • the transmitter I 0 may be supported at the upper end of the tubular standard 44 of a desk stand or a floor stand 45, the lower end of the standard 44 being coupled to a base member 46. While this invention has been disclosed with reference to a preferred embodiment, it is to be understood that it is not limited thereto but by the scope of the appended claims only.
  • An acoustic device comprising a case, a diaphragm in said case, said case'having a perforated portion in front of said diaphragm for the passage of sound waves thereto, and a plurality of ridges on said perforated portion extending radially outward from the center thereof, said ridges increasing in height with distance from said center.
  • An acoustic device comprising a case having an apertured portion for the passage of sound waves, a diaphragm in said case behind said portion and forming with the case a shallow chamber between the diaphragm and the inner end of the aperture, said diaphragm having a central dome-shaped portion about onemil in thickness, and ridges on the outer surface of the apertured portion, extending. outwardly from the central portion thereof, defining pressure-release paths with the apertured portion for air when something is suddenly or violently placed across the apertured portiom 3.
  • a microphone comprising a case, 8.
  • said case having a perforated portion in front of said diaphragm for the passage of sound waves thereto, and raised portions on the outer side of said perforated portion defining sector-shaped spaces.
  • An acoustic device comprising a cylindrical case, a diaphragm mounted in said case adjacent one end, said diaphragm being dome-shaped with its convex side toward said end of the case, the thickness of said diaphragm being of the order of .001 inch, a closure member for said end of the case comprising a perforated portion spaced from said diaphragm and having a convex outer surface, and guard means comprising a plurality of radially spaced ribs, the inner portion of said ribs conforming to the curvature of said closure member and the outer surface of said ribs lying in a plane perpendicular to the axis of the cylindrical case, said ribs preventing the building up of a pressure harmful to said diaphragm such as might be caused by quickly or violently covering the perforations.
  • An acoustic device comprising a case, a very thin diaphragm mounted in said case, a portion of said case being perforated for the passage of sound waves, and a plurality of upstanding ing, a diaphragm of the order of .001 inch in thicknessmounted in said casing, the wall of said casing adjacent the diaphragm having perforations for the passage of sound waves, and means comprising a plurality of radially arranged ribs,
  • An acoustic transmitter comprising 9. casing, a very thin diaphragm mounted in the casihg, said casing having a perforated portion for the passage of sound waves, and means for protecting said diaphragm from destructive pressure surges including means projecting from said perforated portion and defining a plurality of outwardly flaring pressure release passages.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
US99910A 1936-09-09 1936-09-09 Acoustic device Expired - Lifetime US2131593A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL47966D NL47966C (xx) 1936-09-09
US99910A US2131593A (en) 1936-09-09 1936-09-09 Acoustic device
GB13106/37A GB473878A (en) 1936-09-09 1937-05-07 Improvements in or relating to acoustic devices
FR822144D FR822144A (fr) 1936-09-09 1937-05-22 Dispositifs acoustiques
CH201674D CH201674A (fr) 1936-09-09 1937-06-08 Dispositif acoustique.

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US99910A US2131593A (en) 1936-09-09 1936-09-09 Acoustic device

Publications (1)

Publication Number Publication Date
US2131593A true US2131593A (en) 1938-09-27

Family

ID=22277206

Family Applications (1)

Application Number Title Priority Date Filing Date
US99910A Expired - Lifetime US2131593A (en) 1936-09-09 1936-09-09 Acoustic device

Country Status (5)

Country Link
US (1) US2131593A (xx)
CH (1) CH201674A (xx)
FR (1) FR822144A (xx)
GB (1) GB473878A (xx)
NL (1) NL47966C (xx)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653192A (en) * 1948-01-10 1953-09-22 Shipton Edward Telephone apparatus
US4529059A (en) * 1982-12-27 1985-07-16 Federal Signal Corporation Vibrating diaphragm type audible device with acoustically improved grille and method
US20050041819A1 (en) * 2003-08-22 2005-02-24 Brown William Sumner Sound-based vehicle safety system
USD760204S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD760203S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD760704S1 (en) * 2015-01-05 2016-07-05 Gibson Brands, Inc. Microphone
USD808937S1 (en) * 2016-12-30 2018-01-30 Liangyi Zheng Microphone
USD840476S1 (en) * 2017-07-10 2019-02-12 MerchSource, LLC Kid's microphone
USD899407S1 (en) * 2020-03-21 2020-10-20 Shenzhen Xunweijia Technology Development Co., Ltd. Microphone
USD918876S1 (en) * 2020-05-19 2021-05-11 Shenzhen Xunweijia Technology Development Co., Shenzhen Microphone
USD949861S1 (en) * 2019-09-05 2022-04-26 Canon Kabushiki Kaisha Joystick

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2653192A (en) * 1948-01-10 1953-09-22 Shipton Edward Telephone apparatus
US4529059A (en) * 1982-12-27 1985-07-16 Federal Signal Corporation Vibrating diaphragm type audible device with acoustically improved grille and method
US20050041819A1 (en) * 2003-08-22 2005-02-24 Brown William Sumner Sound-based vehicle safety system
US7697698B2 (en) * 2003-08-22 2010-04-13 William Sumner Brown Sound-based vehicle safety system
USD760204S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD760203S1 (en) * 2015-01-05 2016-06-28 Gibson Brands, Inc. Microphone
USD760704S1 (en) * 2015-01-05 2016-07-05 Gibson Brands, Inc. Microphone
USD808937S1 (en) * 2016-12-30 2018-01-30 Liangyi Zheng Microphone
USD840476S1 (en) * 2017-07-10 2019-02-12 MerchSource, LLC Kid's microphone
USD949861S1 (en) * 2019-09-05 2022-04-26 Canon Kabushiki Kaisha Joystick
USD899407S1 (en) * 2020-03-21 2020-10-20 Shenzhen Xunweijia Technology Development Co., Ltd. Microphone
USD918876S1 (en) * 2020-05-19 2021-05-11 Shenzhen Xunweijia Technology Development Co., Shenzhen Microphone

Also Published As

Publication number Publication date
NL47966C (xx)
CH201674A (fr) 1938-12-15
FR822144A (fr) 1937-12-21
GB473878A (en) 1937-10-21

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