US1632068A - Phonic diaphragm - Google Patents

Description

une 14, 1927. 1,632,068

H. Ce HARRESGN PHONIQ DIAPHRAGM -Filed June 19, 192.3y

y my ,477%

Patented June 14, 1927.

UNITED STATES lParnu'r oFFic'r..

HENRY C. HARRISON. F PORT WASHINGTON, NEW YORK, ASSIG-NOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, 0F NEW YORK, N. Y., A. CORPORATION OF NEW YORK.

PHONIC DIAPHRAGM.

Application tiled June 19, 1923. Serial Nc. 646,307.

The invention relates to plionic diaphragms and has for an object to provide a diaphragm of such configuration that it will besti'f in both radial and axial directions.

l The invention is not realized by a diaphragm having concentric circular corrugations for xthe reason that such a diaphragm, while stiff in radial directions, has not the required stiffness in an axial direction, that is, a direction along a line passing through the center of the diaphragm and at right angles thereto.

-The object of. the invention is accomplished by providing' a diaphragm having corrugations such that any straight line drawn across the diaphragm, or any circle vdrawn on the diaphragm about any center on the diaphragm will cross a corrugation.

For further details, reference may be made to the drawings in which Fig. 1 is a cross-sectional view of such a diaphragm when employed as a loud speaker. Fig. 2 is a front elevation of the diaphragm in' Fig. 1. Fig. 3 is-.a front elevation partly insection of a composite diaphragm made up of two diaphragme such as shown in Figs. 1 and 2. Fig. l is a sectional elevation of Fig. 3. Fig. 5 is a sectional elevation of a conical diaphragm having an unsupported periphery and corrugated as in Fig. 2. Fig. 6 is an enlarged view of the corrugations.

Referring` in detail to the drawings, the diaphragm 1 may be of thin, still' material such as paper' or metal, and has closely spaced zig-zag corru ations of the form shown in detail in ig. 6. In case the periphery of the diaphragm 1 is to be clamped, as shown in Figs. 1. and 2, the peri heral portion 2 of the diaphragm is pre erably not corrugated. The diaphragm portion 2 then rovides a flexible section between the rigi diaphragm 1 and the sup-1 port 3. The diaphragm may be driven at its center by any suitable drive such as the described in detail in Egerton' Patent No.

1,365,898--January 18, 1921.

- Figs. 3 Aand 4 show a modification wherein two diaphragms 5 and 6 having corrugations, as inFig. '6, are fastened 'to an intermediate disc 7 which is carried by the support 3. In this case the corrugations in diaphragm 5 extend generally at right angles to the corrugations of diaphragm 6, as

' electromagnetic device 4 which is shown and' illustrated in Fig. 3. If the diaphragms 5 and 6 are of metal such as aluminum then the intermediate disc 7 may be of the same or similar material, and the diaphragms 5 and 6 may be fastened, for instance, by spot welding to the disc 7. If desired, however, the diaphragms 5 and 6 and the diaphragm 1 as well, may be of any other suitable light, stiff material such as paper. In this case the Vdisc 7 may be of paper or similar material and the parts 5, 6 and 7 may be fastened together by means of glue or the like.

The diaphragm 8 in Fig. 5 has corrugations as shown in Fig. 6 and may be of the materials described/above. This diaphragm is illustrated as a coe supportedat its apex by a driving rod 9 of the electromagnetic device 4.

All of the diaphragme above described are large direct acting diaphragms of the order o a foot or more in diameter and they may act' to directly set the air into vibration without the use of a restrictive device such as a horn.

If the diaphragm is of metal the corrugations may be formed by stamping or the like. If it is of material such as paper they may be formed either during the process of manufacturing the textile sheet or afterwards by dampening a flat sheet-and pressing it into a corrugated die.

What is claimed is:

1. A composite phonic diaphragm comprising a plurality of corrugated diaphragms, the corrugations of one of said diaphragms crossing the corrugations of another of said diaphragme.

2. A large direct acting phonic diaphragm having a plurality of parallel discontinuous ridges so positioned that the crest of the ridges form only zig-zag lines consisting of short straight line sections serially connected and extending in one general direction.

3. A large direct acting phonic dia hragm n iade of sheet material having forme therelin a plurality| of parallel broken series of `formed of thin sheet material and having itsv he imm of zig-zag :ranges9 each range conn sistingjv of short straight line ridges joineii.

end-to-end and at an angle to one aifio'siier:

each range being separated from the f cent range throughout its extem by slinilariy shaped v n En Witness whereof, il hereuno subscribe my name this 15 day of June [L iF/ HENRY C. -RRESIJ

Images