US1717158A - Sound reproducer - Google Patents

Description

June '11, 1929. u IW, C, JQNES 1,717,158

SOUN1\) REPRODUCER Filed April 13,1928

@lfm 2 /fwf/v 70H WAR/PEN C- JUA/5.5

A TTM/VD( l excited to set up a flux in a magnetic circuit- 2 in which there isan annular air-gap 3.. i A4 Patented June 11, 1929.

UNITED STATES l 1` ..Ti;11-1-T orner..

` WARREN c. JoNEs, orrnusnma NEW YORK, Ass'IGNoa fro BELL TELEPHONE mnoEA'roaIEs, 'mooaronATEn or NEW YORK, N. Y., A coEroaArIoN or NEW Yoan SOUND RErRotUcEn. l

Application led April 18,1928, Serial IIa-270,920

ly the diaphragm to which-the coil'is at-4 tached, in accordance with the current variations. -The coil leads'are necessarily of very small cross section and oftenv break under the constant flexing action unless special pre-- cautions are taken. f

' v15 LThe generar object f this invention "is therefore to prevent the breaking of such lead wires.

-In accordance with the generalfeatures of.

f thisV invention the coil leads are run looselyin conduits Vwhich extend outwardly to binding posts beyond the `periphery of the dia-a A phragm. 'Ihe4 conduits are rigidly attached' to the diaphragm and-vibrate freely with it and the ilexingaction is thereby distributed l 25 over such a length .of conductor thatbreaking is eliminated. In-the drawing Fig. 1 is a sectional view ofja movingcoil type receiver embodying the present invention; f Fig. 2 is a plan view looking upward atthe diaphragm and showing the location of thel lead conduits; and Fig. 3 is a detailed view of the lead wire' In a copending application of E. CfWente No. 127 ,023, filed August 4, 1926 there is def scribed a receiver of the same general ,type "as the one used to illustrate theJ present i nvention.

Referring -to Fig. 1 a circular field coill is coil 4,`co'nsisting of a'n'u'mber of turns of fine yWire, is rigidly attached to a diaphragm 5,

A.45 The current -'variations corresponding to'the sound -to be reproduced traverse this coil and. by their interaction .with the magnetic 1 lengths;

tion to the diaphragm.

Currents are led to the coil'5 through conductors or lead Wires 7, 7 which are preferfield inair-gap 3 impart a corresponding moably co'ntinuations of the conductor comprisl ing the coil. The lead wires 7, 7 arecarried to the terminals of the operating circuit through conduits 6, 6 composed'of alight weight insulating material and of sullicient internal diameter to permit free movement of the lead 'wires 7, -7r when the diaphragm is vibrated; a

The conduits 6, 6 are'secured to the diaphragm by some -suitable cementing sub# stance such as shellac andv are preferably long -nough to extend under a clamping ring to a point near bindin A posts 9, 9.

- Vhat-is claime 1s: #1." In a telephone receiver, in combination,

a diaphragm, means for producing a'magnetc field, a coil rigidly secured tothe diaphragm and located in said magnetic eld,

connecting conductors extending from the coil to points adjacent the periphery of the diaphragm, and conduitssecured to the diaphragm through -which the connecting conductors extend, the inside diameter ofthe conduits being greater than the outside diam-A eter of the connecting conductors whereby flexing action of the conductors in response to the vibrations of the diaphragm is -dlstribut'- ed over the length of theconductors.

2. In a telephone'receivenin combination,

a diaphragm, means for producing a -magnetic field, a'lcoil of less diameter than the diaphragm rigidly secured in concentric-relation. t0 the diaphragm and located in said magnetic 4lield,' conducting 4leads extending from the energizing coil to the periphery of aphragm for supporting thefcondcting leads in guided but unrestricted vibrational relation to j the diaphragm throughout their In witness whereof, I-hereunt'o subscribe by name this 4th `day of April, 1928.

-the diaphragm, and means carried by the di- WARREN o. IoNEs.

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