US2860721A - Sound reproducing device - Google Patents

Description

Nov. 18, 1958 J. A. HASSAN SOUND REPRODUCING DEVICE Filed March 24, 1954 United States Patent SOUND REPRODUCING DEVICE Joseph Hassamweymouth, Mass., assignor of one-half to Fauthal A. Hassan, Weymouth, Mass.

Application March 24, 1954, Serial No. 418,417

Claims. (Cl. 18131) This invention relates to a device for reproducing sound such as is used in radios, television sets and the like.

The principal object of my invention is to provide a device to improve the reproduction of bass or low frequency tones as well as high frequency tones, without the loss of any other quality, and without increasing the size of the diaphragm and supporting frame forming part of my device.

It is well known that the ordinary diaphragm used in many radios and television sets is weak in response at the outer edge and reproduces bass tones poorly or not at all, yet it must be relatively small to be accommodated in the limited housing afforded by popular radios and television sets. To improve and enlarge tone receptivity it is my object to increase the piston area of the diaphragm within the frame by utilizing the whole conical surface of the diaphragm for that purpose by eliminating the use of the outer annular portion as a securing means.

A further object is to improve the support for said diaphragm.

The foregoing and other objects which will appear as the nature of the invention is better understood, may be accomplished by a construction, combination and arrangement of parts such as is disclosed by the drawings. The nature of the invention is such as to render it susceptible to various changes and modifications, and, therefore, I am not to be limited to the construction disclosed by the drawings nor to the particular parts described in the specification; but am entitled to all such changes therefrom as fall within the scope of my claims.

In the drawings:

Figure 1 is a front producing device.

Figure 2 is a side elevational view thereof.

Figure 3 is an enlarged, sectional view taken on the line 3-3 of Figure 1.

As illustrated, my diaphragm is used with a sound reproducing device having the usual instrumentalities to actuate or vibrate the diaphragm. Said instrumentalities have the usual magnetic frame embodying at its upper part, an inwardly extending, magnetic pole portion 12. A field pole 14, having a magnet portion 16, is attached to said frame 10 and extends upwardly therefrom. A voice coil has a form 18 that surrounds said field pole 14 around which form is wound the usual coil winding 20. Surrounding the upper part of said voice coil form 18 and attached to it is a compliant spider 22 that is cemented to said frame 10.

Extending from said magnetic frame 10 is an external diaphragm support 24 usually made of metal or other stable material, and of generally conical frustum-shape. Said support 24 has a base 26 fixedly attached to said frame 10, a shoulder 28 extending inwardly above said base 26, and a main body or basket portion 30. In the outer half of said support 24, as shown, in an inwardly extending, attaching shelf 32, a connecting portion 34, an inwardly extending upper shelf 36 and a top rim 38 above elevational view of my sound re- 2. it. Resting on said upper shelf 36 is a gasket 39 which said top rim 38 circularly encloses.

A conical, apertured diaphragm 42 is attached at its smaller, end to said voice coil form 18. It is made of the usual flexible material and its outer edge is free, extending to a point adjacent said rim 38, being slightly spaced laterally from and opposite'to said gasket 39. Said diaphra'gm 42 is turned over somewhat at its outer edge to provide a slight beading. It may be circular or oval.

A flexible, expansible, suspension connector 46 is circumferentially attached, as at 48, to an intermediate portion of said diaphragm 42 and to said diaphragm support at said lower ledge 32, as at 50. The attaching point 48 is preferably at the outer half portion of the diaphragm. This connector 46 is shown corrugated and annular, hence it yieldingly supports said diaphragm circumferentially. It may be made of similar material to that of the diaphragm; but preferably slightly thinner. It serves not only to hold the diaphragm 42 in the desired position, while permitting the necessary vibratory movement of it to the outer edge, without the necessity of fixedly attaching any part to said support 24. Thus the piston area of the diaphragm 42 includes the entire area from the sound translating instrumentalities. This increases its sensitivity since no part is immovably attached and the whole is vibratorily responsive to said vibrating instrumentalities.

What I claim is:

1. A sound reproducing device comprising vibrating instrumentalities, a diaphragm operatively connected to said instrumentalities at its inner end and being unattached at its outer end, a support connected to said instrumentalities and spaced from said diaphragm, embodying an inwardly extending, attaching shelf at a point intermediate the outer and inner ends of said support, another shelf outwardly of said intermediate shelf and an outer rim outwardly of said other shelf, a gasket on said other shelf within said rim, and a flexible, expansible annular connector circumferentially attached to said diaphragm at a point intermediate the outer and inner ends thereof and attached to said attaching shelf, said diaphragm outer end being adjacent to and inwardly opposite said gasket and spaced therefrom.

2. A sound reproducing device comprising vibrating instrumentalities, a diaphragm operatively connected to said instrumentalities at its inner end and unattached at its outer end, a support attached to said instrumentalities and extending outwardly of said diaphragm, and a radially expansible, flexible connector ring of vibrating material attached to said diaphragm at a point intermediate the said inner and outer ends thereof and extending outwardly to and attached to said support.

3. A sound reproducing device comprising vibrating instrumentalities, a diaphragm operatively connected to said instrumentalities at its inner end and unattached at its outer end, a support attached to said instrumentalities and extending outwardly of said diaphragm, and a radially expansible, solid, flexible connector of vibrating material attached to said diaphragm at the outer half portion thereof at a point spaced inwardly from the outer end and attached to said support at a point spaced inwardly from said diaphragm outer end.

4. A sound reproducing device comprising vibrating instrumentalities, a diaphragm operatively connected to said instrumentalities at its inner end and unattached at its outer end, a support attached to said instrumentalities and extending outwardly of and being adjacent to and spaced from said outer end of said diaphragm, and a radially expansible, flexible connector of vibrating material attached to said diaphragm at a point intermediate the said inner and outer ends thereof; and attached to- Patented Nov. 18, 1 958 3 salidkupport at a 'poinfspaced inwardly from said diaphragmouter end.

5. A sound reproducing device comprising vibrating instrumentalities, a diaphragm :ope ratively connected to said instrumentalitiesat' its inner end, its outer end 'bihfme, a support connected to said instrumentalities and extending outwardly'of said diaphragm, and 'an'e'xp'ansible connector of Vibratingsheet material attached to"said"diaphragm' at a point intermediatesaidinnera'ndouter ends of and attached to said'support' at a'point intermedia'te the inner and outer end's of the latter.

and extending radiallyoutward to the outer end extremity 10 UNITED STATES PATENTS Johnson Oct. 14, 1930 Fanger Aug. 1, 1933 Julie Mar. 3, 1953 FOREIGN PATENTS Great Britain July 25, 1929 Great Britain Nov. 21, 1929 France SeptI,l16,"19'35

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