US1769438A - Acoustical device - Google Patents

Acoustical device Download PDF

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Publication number
US1769438A
US1769438A US370814A US37081429A US1769438A US 1769438 A US1769438 A US 1769438A US 370814 A US370814 A US 370814A US 37081429 A US37081429 A US 37081429A US 1769438 A US1769438 A US 1769438A
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US
United States
Prior art keywords
hide
tones
tympanum
hair
acoustical
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
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US370814A
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English (en)
Inventor
Kullman Jacob
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Individual
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Individual
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Filing date
Publication date
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Priority to US370814A priority Critical patent/US1769438A/en
Priority to FR695592D priority patent/FR695592A/fr
Application granted granted Critical
Publication of US1769438A publication Critical patent/US1769438A/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
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction
    • H04R7/12—Non-planar diaphragms or cones
    • H04R7/122—Non-planar diaphragms or cones comprising a plurality of sections or layers

Definitions

  • This invention relates generally to acoustical devices in which mechanical vibrations are translated into sound. It hasparticular application to the construction of devices excited With electrical current variations of voice frequencies, such as loud speakers.
  • FIG. 1 is a side elevational view in cross section, illustrating a device constructed in accordance with my invention.
  • FIG. 2 is a front view of a portion of the device shown in Fig. 1.
  • Fig. 3 is a side elevation in cross section, illustrating a modification .of my device.
  • Fig. 4 is a front elevational View showing a portion of the devise shown in Fig. 3.
  • baffles in conjunction with sound reproducing units, in order to secure proper rreproduction of the lower tones.
  • the bale extends outwardly for a substantial distance from the periphery of the tympanum.
  • the magnetic unit is mounted within a cabinet, as for example in the cabinet of a radioreceiving set, the front and side Walls of the cabinet form the required baille.
  • Balles which have been used in the past have been constructed of Wood, pressed fibre, or equivalent 19:29.y serial No. 370,814.
  • Devi 11 may be of the dynamic type .in which a coil l2 is secured to the apex of cone v10 and operates Within an annular magnetic gap.
  • a permanent magnetic fieldk can be provided, or device 11 can have a field Winding connected to a suitable source of current. Electrical current variations of voice frequencies, as Lfor example that obtained from the output of a radio receiving set, are impressed upon the coil 12.
  • the inner portion of the cone 10 is shown resiliently supported by means of spring strips 13, While the periphery is resiliently supported by a i flexible edge portion 14.
  • a suitable rigid frame 16, carried by the magnetic device 11, serves as a support for the flexible edge portion 14.
  • the baille which is used in conjunction with tympanum 10, is formed by one or .4
  • the fra-me in this instance consists of an outer structure 18 serving ⁇ as a support for the outer peripheral edge of the hide, andan inner structure 19 which terminates the inner edge of the hide near the outer periphery of the tympanum 10.
  • Frame 18 can be supported in any suitable manner on a cabinet or other mounting for the loud speaker, or if desired, hide 21 and f rmf 1,8 e
  • the hide is preferably stretched upon the frame with considerable tension.
  • the extent of the baffle from the peripheral edge of the tympanum should be suhicient to insure proper reproduction otl the loiv tones. Since the minimum dimension requirements for acoustical bales of this kind are Well known in the art, this matter need not be explained in detail.
  • the hides may be cured or uncured, although for strength and ease in manufacture, it is preferably cured. It is also possible to use the hide with or Without the natural hide hair.
  • the hide Without hair has been found to be of marked advantage over baille materials which have been used in the past, although best results have been secured by utilizing hide having its hair l5 upon one surface of the same, as indicated at Q1.
  • the exact manner in which the layer ot hair contributes to the success of my invention is not clear. Probably the hair entraps a layer of cushioniner air in front of 2O the baboard, and the individual hairs in following the movements of the air particles probabi)v exerts a damping action.
  • the damping action actuallyv occurs, it is not suflicient to cause distortion of the reproduced tones, but reduces the intensity or absorbs the relativel'v high freevuencv shrill tones or noises, which detract from the desired musical tones.
  • the hair upon the hide it is preferablyv faced toward the 30 front of the speaker. or towards that side of the speaker from which the sound is being propagated.
  • Figs. 3 and 4 I have illustrated another toi-m ot baille which is in the form of a truncated cone, rather than planar as shown in Figs. 1 and 2.
  • a metal spacing structure Qi connects together the inner and outer frame structures 118. 119 upon which the hide 11T is stretched.
  • IVhen positioned upon the iranie the form of the hide is such that it continues the conical form of the tympanum 10. Particularlv goed results have been achieved With a baiiie of this form made ot hide, both with respect to the quality of reproduction and to the propagation of the sound Waves in a given direction.
  • An acoustical device comprising a sound translating unit, and a sound baille extending over a substantial area and formed of hide having hair on one side ofthe saine.
  • An acoustical device comprising a tympanum, magnetic means serving to vibrate said tvmpanum to generate sound waves. and a baffle extending from the periphery of the tyinpanum over a substantial area. said baffle being formed of hide having hair upon its forward surface.

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  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)
US370814A 1929-06-14 1929-06-14 Acoustical device Expired - Lifetime US1769438A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US370814A US1769438A (en) 1929-06-14 1929-06-14 Acoustical device
FR695592D FR695592A (fr) 1929-06-14 1930-05-14 Dispositif acoustique pour hauts-parleurs

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US370814A US1769438A (en) 1929-06-14 1929-06-14 Acoustical device

Publications (1)

Publication Number Publication Date
US1769438A true US1769438A (en) 1930-07-01

Family

ID=23461302

Family Applications (1)

Application Number Title Priority Date Filing Date
US370814A Expired - Lifetime US1769438A (en) 1929-06-14 1929-06-14 Acoustical device

Country Status (2)

Country Link
US (1) US1769438A (fr)
FR (1) FR695592A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275100A (en) * 1965-06-16 1966-09-27 William S Dunning Loudspeaker assembly having loudspeaker wholly supported by vibratory diaphragm

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3275100A (en) * 1965-06-16 1966-09-27 William S Dunning Loudspeaker assembly having loudspeaker wholly supported by vibratory diaphragm

Also Published As

Publication number Publication date
FR695592A (fr) 1930-12-18

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