US2778440A - Acoustic resistor - Google Patents

Acoustic resistor Download PDF

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Publication number
US2778440A
US2778440A US342144A US34214453A US2778440A US 2778440 A US2778440 A US 2778440A US 342144 A US342144 A US 342144A US 34214453 A US34214453 A US 34214453A US 2778440 A US2778440 A US 2778440A
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US
United States
Prior art keywords
resistor
wound
acoustic
strip
acoustic resistor
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
US342144A
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English (en)
Inventor
Schenkel Gerrit
Haan Jacob Izaak De
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.)
Hartford National Bank and Trust Co
Original Assignee
Hartford National Bank and Trust Co
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 Hartford National Bank and Trust Co filed Critical Hartford National Bank and Trust Co
Application granted granted Critical
Publication of US2778440A publication Critical patent/US2778440A/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
    • H04R1/20—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 acoustic resistors made of wound tape or web-like material, the flow resistance to the vibrating air being formed by narrow ducts between the separate layers of the tape or web-like material.
  • the manufacture of such an acoustic resistor constitutes a comparatively difiicult problem in view of the mutually equidistant arrangement of the said layers.
  • the object of the invention is to provide a simple solution of this problem.
  • each layer is constituted by at least one strip of material which has a flat wire or a tape wound on it with intermediate spacing.
  • This Wire or tape is the means by which the layers are kept spaced apart, the simplicity of this means lying in the continuity of the means interposed between adjacent layers.
  • each layer is constituted by two strips, only one of which has a Wire or tape wound on it, the windings on the two strips being arranged either on edge or flat.
  • the invention relates to an acoustic device, for example a microphone, comprising an acoustic resistor, more particularly an electro-dynamic microphone comprising a dome-shaped diaphragm and an acoustic network on the the rear of the diaphragm.
  • a resistor element of this network is constituted by the acoustic resistor described hereinbefore, the strips of which engage each other at their broad sides so as to form a spiral and which is caused to become arcuate in a manner such that the diaphragm and the resistor are spaced by a constant distance.
  • Fig. 1 is a plan view of an embodiment of an acoustic resistor according to the invention
  • Fig. 2 shows for the sake of clarity an elevation of the two layers from which the resistor is built up.
  • Fig. 3 shows part of an electrodynamic microphone Patented Jan. 22, 1957 comprising an accoustic resistor according to the invention.
  • a core 1 has two strips 2 and 3 wound flat on it so as to form a spiral.
  • the strip 3 has a flat wire or tape 4 wound on it with an intermediate spacing 5. (See also Fig. 2.)
  • Fig. 3 shows part of an electrodynamic microphone comprising a dome-shaped diaphragm 6 having secured to it a voice coil 7 arranged in the air-gap between two concentric pole pieces 8 and 9 of a magnet system, the remaining part of which is not shown.
  • the pole piece 9 supports an acoustic resistor 10 according to the invention. This resistor is also dome-shaped and the spacing 11 between the diaphragm and the resistor is constant.
  • An acoustic resistor comprising a body constituted of a plurality of layers of strip-like material wound in a spiral shape, at least one of said layers having a strip and an elongated member wound at spaced intervals about said strip, the spacings of said elongated member being narrow air passages in said body extending parallel to the central axis of said body.
  • An acoustic resistor comprising a substantially flat body constituted of two spirally-wound strip-like members and an elongated member wound at spaced intervals about only one of said strip-like members and abutting the other strip-like member, said strip-like members and elongated member defining narrow air passages in the body extending parallel to the central axis thereof.
  • a dome-shaped diaphragm and an acoustic resistor mounted behind said diaphragm, said resistor comprising a dome-shaped body constituted of two spirally-wound strips and a third strip wound at spaced intervals about only one of said two strips and abutting the other strip, said strips dcfining narrow air passages spaced along its length and extending at right angles to the surface of said diaphragm, said diaphragm and resistor being spaced apart by the same distance along all of their confronting surfaces.

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  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
  • Piezo-Electric Transducers For Audible Bands (AREA)
  • Transducers For Ultrasonic Waves (AREA)
US342144A 1952-04-03 1953-03-13 Acoustic resistor Expired - Lifetime US2778440A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL726247X 1952-04-03

Publications (1)

Publication Number Publication Date
US2778440A true US2778440A (en) 1957-01-22

Family

ID=19817821

Family Applications (1)

Application Number Title Priority Date Filing Date
US342144A Expired - Lifetime US2778440A (en) 1952-04-03 1953-03-13 Acoustic resistor

Country Status (5)

Country Link
US (1) US2778440A (he)
BE (1) BE518909A (he)
DE (1) DE931055C (he)
GB (1) GB726247A (he)
NL (1) NL83991C (he)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1488565A (en) * 1919-07-11 1924-04-01 George W Stewart Porous damper for acoustical instruments
US1954966A (en) * 1931-01-31 1934-04-17 Bell Telephone Labor Inc Sound translating device
US1975637A (en) * 1930-05-30 1934-10-02 Paraffine Co Inc Acoustical material
US2065751A (en) * 1935-12-31 1936-12-29 Rca Corp Acoustic resistance device
US2126254A (en) * 1936-12-23 1938-08-09 Ernest E Gowell Rug and method of making the same
US2656585A (en) * 1948-04-13 1953-10-27 Neisler Mills Inc Plied yarn and plied yarn fabric and method of making same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1488565A (en) * 1919-07-11 1924-04-01 George W Stewart Porous damper for acoustical instruments
US1975637A (en) * 1930-05-30 1934-10-02 Paraffine Co Inc Acoustical material
US1954966A (en) * 1931-01-31 1934-04-17 Bell Telephone Labor Inc Sound translating device
US2065751A (en) * 1935-12-31 1936-12-29 Rca Corp Acoustic resistance device
US2126254A (en) * 1936-12-23 1938-08-09 Ernest E Gowell Rug and method of making the same
US2656585A (en) * 1948-04-13 1953-10-27 Neisler Mills Inc Plied yarn and plied yarn fabric and method of making same

Also Published As

Publication number Publication date
GB726247A (en) 1955-03-16
BE518909A (he)
NL83991C (he)
DE931055C (de) 1955-08-01

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