US2230548A - Loudspeaker diaphragm - Google Patents

Loudspeaker diaphragm Download PDF

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Publication number
US2230548A
US2230548A US225752A US22575238A US2230548A US 2230548 A US2230548 A US 2230548A US 225752 A US225752 A US 225752A US 22575238 A US22575238 A US 22575238A US 2230548 A US2230548 A US 2230548A
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US
United States
Prior art keywords
diaphragm
loudspeaker
loudspeaker diaphragm
ranges
wires
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
US225752A
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English (en)
Inventor
Severin Edwin
Risselmann Karl-Heinz Von
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.)
Telefunken AG
Original Assignee
Telefunken AG
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 Telefunken AG filed Critical Telefunken AG
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Publication of US2230548A publication Critical patent/US2230548A/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; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Definitions

  • the diaphragm a kind of material which inheres high internal friction.
  • the partial resonances will thus be damped and diminished, the peaks will 30 not turn out as high and the crevasses as deep; in
  • the frequency band as a whole will be leveled and smoothed down.
  • a diaphragm may be built from two dissimilar materials in such a way that material was removed 5 from a cone structure reinforced by ribs so that there remained nothing but a supporting frame or skeleton, whereupon the latter was enveloped with paper, silk, or some similar low-weight material. It is also known in the art to make a 10 diaphragm of large surface from pap silk, or the like impregnated with natural or artificial resins by removing portions from the diaphragm structure, the resultant recesses or openings being thereupon closed by a coating of varnish or 18 gelatine. Diaphragms are furthermore known in the art which are made of a doubly bent wire network or gauze, the latter being thereupon covered with a coating material consisting of light and thin cloth or fabric.
  • Fig. 1 represents a sector of a conical diaphragm which embodies the features oi this invention
  • Fig. 2a is a response curve of a loudspeaker utilizing a known diaphragm
  • Fig. 2b is a response curve or a loudspeaker utilizing a diaphragm made according to the present invention
  • Figs. 3a and 3b are graphs depicting the in-' stability ranges of loudspeakers according to the prior art and the present invention, respectively.
  • the reticulate or mesh fabric we made of aluminum or the like wires is fashioned to result in a conical diaphragm,- for instance.
  • the meshes thereupon are coated with the transparent artificial material which is transparent and also preferably weather-proof and acid-resistant. It desired, the fabric could be so coated with the synthetic substance when still in flat or uniashioned form, the diaphragm then being shaped out of the flat material after this treatment has.been finished. a
  • Figs. 2a and 2b show the characteristics of two loudspeakers which have been fitted into an acoustic walL'
  • Fig. 2a shows the frequency curve of a modern type of loudspeaker
  • Fig. 2b a similar curve of a loudspeaker fitted with 9. diaphragm oi' the kind here disclosed.
  • Figs. 8a and 8b show the instability ranges which are occasioned by flexural or bending vibrations (nib-octave or subharmonic oscillations), Fig. 3a showing the instability ranges for a modern 5-watt loudspeaker. The measurements included only the range up to 4 watts since no exact measurements were feasible any more beyond this level.
  • Fig. 3b shows the same instability ranges for a diaphragm according to the present invention which also was intended for a 5-watt loudspeaker. It will be noticed that the instability ranges occur only in the presence of energies which are greater than 5 watts, that is, above the nominal (rated) load.
  • An acoustic diaphragm of large area and conical formation comprising a sheet of wire gauze serving asa base for the diaphragm and a cellulose derivative coating applied thereto, the mesh openings of the wire gauze varying in size in the direction from the apex to the outer rim of the diaphragm, thereby providing greater rigidity at the apex than at the rim portion of the diaphragm.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Diaphragms For Electromechanical Transducers (AREA)
US225752A 1937-08-30 1938-08-19 Loudspeaker diaphragm Expired - Lifetime US2230548A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE518636X 1937-08-30

Publications (1)

Publication Number Publication Date
US2230548A true US2230548A (en) 1941-02-04

Family

ID=6550115

Family Applications (1)

Application Number Title Priority Date Filing Date
US225752A Expired - Lifetime US2230548A (en) 1937-08-30 1938-08-19 Loudspeaker diaphragm

Country Status (3)

Country Link
US (1) US2230548A (fr)
FR (1) FR842736A (fr)
GB (1) GB518636A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624417A (en) * 1947-02-20 1953-01-06 Joseph B Brennan Acoustic diaphragm with flexible rim portion and rigid body portion

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2518348B1 (fr) * 1981-12-16 1987-04-10 Guyot Michel Membrane de haut-parleur et procede pour sa fabrication
CN117183041B (zh) * 2023-07-11 2024-06-07 南京林业大学 明胶-木质素磺酸木质复合声学振膜及其制备方法和应用

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2624417A (en) * 1947-02-20 1953-01-06 Joseph B Brennan Acoustic diaphragm with flexible rim portion and rigid body portion

Also Published As

Publication number Publication date
FR842736A (fr) 1939-06-19
GB518636A (en) 1940-03-04

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