US1819627A - Sound reproducer and method of manufacturing the same - Google Patents

Description

Aug. 18, 1931. LE ROY w. STAUNTON ETAL 1,819,627

SOUND REPRODUCER AND METHOD OF MANUFACTURING THE SAIE/ Filed Oct. 8, 1925 '2 Sheets-Sheet 1 FIG I. FIG 2 LE ROY M 57;4U//TONINVENTOR.

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SOUND REPRODUCER AND METHOD OF MANUFACTURING THE SAME Filed Oct. 8, 1925 2 Sheets-Sheet 2 FIG 4 FIG 6- LE zor w STAUNTONIJNVENTOR. a CVK/L A BE/GHAM A TTORN Y I Patented 18, 1931 UNITED STATES PATENT OFFICE LE ROY W. STAUNT'ON, OF JACKSON HEIGHTS, NEW YORK, AND CYRIL A. BRIGHAM OF EAST ORANGE, NEW JERSEY, ASSIGNORS T BRANDES LABORATORIES, INC.,

OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY SOUND REPRODUCER AND METHOD OF MANUFACTURING THE SAME Application filed October 8, 1925. Serial No. 61,298.-

Our invention relates broadly to sound reproducingdiaphragms and more p'articularly to a construction of sound reproducing diaphragm by which music may be reproduced with pleasing tone quality over the entire musical scale.

One of the objects of our invention is to provide a sound reproducing diaphragm by which both the high and low frequency notes may be eliiciently reproduced without distortion or exaggeration in any of the tones.

Another object of our invention is to provide a practical construction of conical diaphragm for electromagnetic sound reproducers which may be inexpensively manufactured on a quantity production basis.

Still another object of our invention is to provide an elliptical shaped conical dia phragm with means for resiliently supporting the periphery of the diaphragm for permitting vibrations of variable frequencies along the slant height of the cone, enabling the difierent frequenciesto be efficiently reproduced byireason of the variable slant height around the elliptical 'diaphgram'.

A further object of our invention is to provide means for resiliently supporting the peripheral edge of an elliptical I conical shaped diaphragm where the resilient means are protected againstdestruction arising out of the continued vibration of the diaphragm.

r1 still further, object of our invention is to provide means for supporting an elliptical conical shaped diaphragm insuch manner that it may be driven by an electromagnetic sound reproducer. 7

Other and further objects .of. our invention will be understood from the following specification by reference to: the accompanying drawings,wherein: I

-Figure 1 is a side elevation showing'the conical diaphragm of our invention; Figs. 2 and 3 show developments of the elliptical cone shaped diaphragm; Fig. 4 is a front view showing the mounting of the diaphragm; Fig. 5 is a side elevation partially in cross section showing the conical diaphragm mounted on a vertical supporting member; and Fig. 6 is an enlarged cross- BOsectional view taken on. line 66 of Fig. 4

showing our method of resilently supporting the peripheral edge of the conical shaped diaphragm.

A Referring to the drawings in more detail, A

reference character 1 shows the conical shaped elliptical diaphragm which may be formed from paper, parchment or other material having good sound reproducing characteristics. In Fig. 3 we have shown a development of the elliptical cone diaphragm where .the material forming the diaphragm is originally cut in a flat sheet substantially in the form of an irregular ellipse, that is a plane figure having a larger radius at one end than at the other end. A V-shaped cut'2 is taken out of the fiat sheet 1 providing a gluing strip 3 at one edge thereof and having a straight edge 4 on the opposite side thereof. In Fig. 2 the elliptical cone shaped diaphragm 1 is shown fully wrapped into completed form with the edge 4 and gluing strip 3' adjacent each other. It will be seen that the larger. diameter of. the conical diaphragm'corresponds to the diameterof a.

circle 5,' whereas the smaller diameter of the conical diaphragm corresponds to a circle 6. The difference in the slant height around the periphery of the conical diaphragm enables vibrations of variable frequencies to be efficiently reproduced over the entire musical scale.

In Fig. 1 we have shown a vertical panel -member 7 on which the elliptical cone shaped diaphragm 1 is resiliently supported. An elliptical aperture is provided in the sup? porting panel 7 represented by reference 'character8 around which the elliptical cone shaped diaphragm 1 is supported by means of an elliptical shaped ring member 9 of resilient material. WVe have successfully used sheet rubber for this purpose and have allowed an extended flange portion 10 which is secured to the surface of the panel member 7 around the elliptical aperture therein. The rubberized ring 9 is extended at an angle 11 and directed inwardly with respect tothe supporting panel 7 presenting an el- .liptical inwardly disposed face 12 which'is secured'to the peripheral edge 14 of the elliptical cone shaped diaphragm 1. It will be observed that we secure the resilient ring to that side of the cone shaped elliptical diaphragm which prevents any tendency of the raw edge 15 from cutting into the re silient material 9. The cone shaped diaphragm 1 is provided with a ferrule member l6 suitably secured by means of a nut l7 at the apex of the cone whereby sound vibrations may be imparted to the diaphragm from an electromagnetic driver of suitable construction.

t will be noted that vibrations imparted to the cone shaped diaphragm l tend to re move the raw edge 15 of the cone away from ;he resilie t material 9, rather than resilient material 9. We have found that this construction is v ry desirable in that there is no tendency for the thin flexible resilient material 9 to he cut at the peripheral edge or the cone shaped diaphragm by the continued vibratory movement of the diaphragm. By reason of the variable slant height around the periphery of the diaphragm we rind that sound brations are produced over the entire musical scale with desirable tone quality. \Ve have found that an elliptical cone shaped diaphragm having a short diameter of six and one hali inches (6%) produces the most eliicient results.

ll hile we have described our invention in certain particular embodiments, we desire that it be understood that modifications may be made and that no limitations upon the invention are intended other than those imposed by the scope of the appended claims.

W'hat we claim and desire to secure by Letters Patent ot the United States is as follows:

1. A sound reproducing diaphragm com prising in combination an elliptically apertured supporting member, an elliptical cone shaped sound reproducing diaphragm arranged to float therein, and an elliptical ring of flexible material disposed between said elliptically apertured supporting member and the peripheral edge of said elliptical cone shaped sound reproducing diaphragm.

2. A sound reproducing diaphragm comprising in combination an elliptically apertured supporting member, an elliptical cone shaped sound reproducing diaphragm arranged to float therein, and a flexible resilient lliptical ring member secured around the periphery of said elliptically apertured supporting member and having its inner peripheral edge disposed at an angle and secured to the outer peripheral edge of said elliptical cone shaped sound reproducing diaphragm.

3. A sound reproducing diaphragm comprising in combination an elliptically apertured supporting member, an elliptical cone shaped sound reproducing diaphragm arranged to float therein, and a flexible resilient elliptical ring member secured around the periphery of said elliptically apertured supporting member and having its inner peripheral edge disposed at an angle and secured to the extreme outer edge of said elliptical cone shaped sound reproducing diaphragm on that side thereof where the vibrations of said diaphragm tend to drive the raw edge thereof away from said flexible resilient elliptical ring member.

4:. A sound reproducing diaphragm comprising a flat sheet of material formed into a conical shaped body with variable slant height between the apex of said conical body and the peripheral edge thereof said peripheral edge being elliptical in shape and symmetrically disposed about said apex, and means for resiliently supporting said peripheral edge whereby sound vibrations of variable frequencies may be elliciently lQPlO--j duced along the variable slant height of said diaphragm.

5. The method of manufacturing a sound reproducing diaphragm which consists in cutting a flat sheet of material in the shape of an irregular ellipse having different radii at opposite ends thereof, removing a V-shaped portion from the end of large radius and rolling the flat sheet thus formed into the shape of an elliptical cone sound.

reproducing diaphragm.

6. The method of manufacturing an elliptical cone shaped diaphragm which consists in cutting a flat sheet of material in the shape of an irregular ellipse having a larger radius at one end thereof than at the other, cutting a V-shaped portion from the end of larger radius, forming a gluing strip on one edge of the V-shaped portion thus formed, rolling the flat sheet into the shape of an elliptical cone shaped sound reproducing diaphragm and securing said gluing strip to the opposite end of said V-shaped portion.

7. A sound reproducing diaphragm consist-ing of a large direct acting sound reproducing diaphragm consisting of a thin sheet of material having an elliptical periphery, means for supporting the periphery of said diaphragm for relatively free vibration, and means for subjecting said diaphragm to mechanical vibration substantially at the geometrical center thereof.

8. A sound reproducing diaphragm consisting of a large direct acting sound reproducing diaphragm consisting of a thin sheet of material having an elliptical periphery, means for supporting the periphery of said diaphragm for relatively free vibration, and means for subjecting said diaphragm to mechanical vibration substantially at the geometrical and acoustical center thereof.

9. A sound reproducing diaphragm comprising a large direct acting cone of thin sheet material having an elliptical periphery,means for flexibly supporting the periphery thereof, and means for subjecting said diaphragm at its geometrical center to mechanical vibration.

10. A sound reproducing diaphragm comprising a large direct acting cone of thin sheet material having an elliptical periph ery, means for flexibly supporting the periphery thereof, and means for subjecting said diaphragm at its geometrical and acoustical center to mechanical vibration.

11. Asound reproducing diaphragm comprising a large direct acting cone of thin sheet material having an elliptical periphery and having its apex symmetrically disposed relative to its elliptical periphery, means for flexibly supporting the periphery thereof, and means for sub ecting said diaphragm at its apex to mechanical vibration. o

In testimony whereof we aflix our signatures. I LE ROY W. STAUNTON. 2 CYRIL A. BRIGHAM.

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