US1611454A

US1611454A - Diaphragm

Info

Publication number: US1611454A
Application number: US24779A
Authority: US
Inventors: Henry W Joy
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-04-21
Filing date: 1925-04-21
Publication date: 1926-12-21
Anticipated expiration: 1943-12-21

Description

H. W. JOY

DIAPHRAGM Filed April 192s INVENTOR M BY 41 ATTORNEY.

Patented Dec. 21. 1926.

unirso STATES HENRY W. JGY, OF NEW YORK, N.'Y.

DIAPHRAGM.

Application filed ApxiltZlQlQfZS. Serial No. 24.779.

lily invention relates to iinproveincntsin cliapln'agms such as are commonly employed in sound reproducing apparatus The principal object of the invention is to provide at diaphragm of this character which may he used in connection with telephones. radio loud speakers, and the like.

A further object of the invention is to provide means LO secure vibrations of the diaphragm that will in their entirety synchronize "ly with the highest to the lowest values or? the modulnted current operating the customary elcctrc-n'ingnet commonly employed to no te diaphragm.

lt has been found necessary to increase the resilience or s gringiness oi the diaphragm us common 3' used in radio loud speakers and the like, so that the spring recoil of the diapl'llfelglll shall have :1 higher velocity or nuinher of vibrntionsiper second than prevail in all. high pitched audible sounds. If the resilience of any diaphragm is of a slower period than the pulsations of the operating or voice carrying current, then the fatigued areas oi the diaphragm will lag behind the vibrations up at and near the center of the diaphragm. 'lihe center of the diaphragm by reason of its receiving the great- 9 t impulse from the magnet will respond to the pull or release or the latter. before the concentric regions thereof between the center of the edge have had time to vibrate in harmen with the increment set up st'the centeix.

With the abovein mind the present in vention coinprehends a diaphragm capable of having simultaneous movements over the entire surface, accomplish this result by impressing a series of ridges, radiating from the center and preferably diminishing in cross section as they approach the edge. I have found that an odd or even number of ridges may be employed, but the ridges should by preference be equidistant, the one from the other. Disphragn'is according to the present invention may be pressed from metal, glass any resilient substance, the overall diameter thereof conforming to the requirements of service. It will be clear that the gauge of the diaphragm will vary according to the material used as Well as the relative diameter.

In practice 1' have found it preferably to impress identically formed radiating ridges which approach each other, and a common center, near as is mechanically possible.

Una embodiment of my improved diaa plan elevstional view of the cannot accommodate the inner or r mitted simulteneonsly to the entire snr phragmis illustrotively cncinglified. accompanying drawings, in whn Fig. taken on the line 2-2 of Fig. l; and l 3 is a transverse sectional View through one of the ribs of the diaphragm.

Referring to the drnWings l0 den diaphragm proper which comprises a. having a plurality of uniformly spac dial ridges l1 impressed therein. The maphragzm is supported between annular memhers l2 and vibrated lcy means of an electromagnct 18.

As the actual center the diiziphragm 1'3 ends of the ridges, the center is apex of the cone is directed towers troenagnet l3 and carries it n'ojection. 15 preferably of soft 29 which is disposed within the ningne old of the electro-inagnet 13. it is'n' chsc nt v necessary to m depress the diaphragm center to form a cone shaped portion becaiise any dec' shape may he used, the object to p Vent the actual center from. vibrating colors any other portion the diaphragm. The comically shaped center l lis me'rel ed in order to strengthen the act of the din hrag'zn which must transmit Vi a ations to al the ridges in unison hecsuse, as the ridges vibrate so each vibrstion is firs of the dinphragn'i, thus preventing or :t'nti ue.

It Wlll be clear "lint the travel or oscillotions of the diaphragm will be greatest and near the center, and such oscillations will diminish as the edge of the diaphragm is approached. concentrically.

The operation of the diaphragm is as fol lows :-The center of the diaphragm. receives an impulse from the magnet 13. The deflection is then transmitted direct and Without loss of time to all the ridges which in turn carry the fiat or plane stress of the diaphragm with them, so as to bring the whole area of the diaphragm into vibration in absolute unison to the magnetic impulse. The ridges 11 by virtue of their." shape resist all movement other than a rise and fall in a plane at right angles to the plane of the diaphragm l0.

\Vhat I claim is 1. Anacoustical diaphragm of "resilient a plurality of impressed depression to a line short of the periphery of a from near the centre of the the diaphragm, said ridges being widest at gni bewards its periphery, said ridgee-suid conical depression and gradually degradually dereasing cross section-creasing in cross section to the Vanishing i the centre tewerd theperiphery of the point toward the periphery of the dia- 15 aiiaiyii-egmi phragm. v I v All acoustical diaphragm of resilient In testimony whereof I have afiixed my eteriel having a conical depression atits signature.

ifentre and a pluraiity of equidistantly spaced" I i e impreesed ridges radiating from the conical HENRY XV JOYV