US1071668A - Method of controlling the vibration of diaphragms. - Google Patents

Description

A. HAYES. g y METHOD OF GONTROLLINGTHE VIBRATI ON OF DIAPHRAGMS.

APPLICATION FILED JULY 10, 1913.

1,071,668. Patented Aug. 26, 1913.

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ALBERT HAYES, 0F SALT LAKE CITY, UTAH, ASSIGNOR TO VOCATONE NIFG. CO. INC., A CORPORATION OF NEW YORK.

METHOD OF CONTROLLING THE VIBRATION OF D1APHIAGM$.

Specification of Letters Patent.

Patented Aug. 26,1913.

To all whom it may concern:

Be it known that I, ALBERT HAYES, a citizen of the United States, residing at Salt Lake City, in the county of Salt Lake, State of Utah, have invented certain new and useful Improvements in Methods of Controlling the Vibration of Diaphragms, of which the following is a description, reference being had to the accompanying drawings, forming a part hereof.

My invention'relates to methods of controlling the vibration of diaphragms of sound reproducing devices such as gramophones, graphophones and other devices in which sound is reproduced by the vibration of the diaphragm, and the invent-ion has for its object to permit the eifective use of larger diaphragms than those ordinarily used, to control the vibration of the diaphragm, to provide channels for the sound Waves, and to so control the vibration of the diaphragm as to produce clear well defined tones, to eliminate blasting and whirring from the tones produced, to prevent blurring and mixing or confusion of successive tones,

to reproduce the tones of the human voice and of musical instruments in a natural way and with a minimum of mechanical suggestion, to give precision and clearness to the reproduction of the enunciation of words, and in general, to secure improved results in the reproduction of sounds.

With these and other objects hereinafter set forth in view my invention consists in the method hereinafter described and particularly pointed out in the claims.

Referring to the drawings which illustrate a form of device capable of use to carry out my improved method: Figure 1 is a vertical sectional view of a sound box embodying my invention taken in a plane in line with the reproducer lever. Fig. 2 is a similar view taken on a plane at rightangles to that on which Fig. 1 is taken; and Fig. 3 is a top plan view partly broken away of the sound box.

In the drawings 1 indicates the body or main member of the sound box having central opening 2 for the outlet of the sound produced by the vibration of the disk or diaphragm 3.

4 indicates the cover member of the sound box which in the construction shown fits into the main member 1 and is retained therein by screws 5. e

The inner faces of the members -1 and 4 are waved or corrugated as shown. the corrugations of the cover 6 extending from the periphery inward to the central opening 7 which is about the diameter of the central opening 2. These corrugations are formed on curved lines preferably the arcs of circles drawn from centers located in a circle concentric with the disk or diaphragm 3 and between its center and its periphery.

The disk or diaphragm 3 has its periphery inclosed in a gasket 8 of yielding material such as semihard rubber and this gasket is held between the members 1 and 4.- of the sound box, the corrugations 6 serving to cause the gasket to be compressed at regular intervals along lines which are on the arcs of circles not concentric with the disk or diaphragm. The compression of the gasket necessarily transmits pressure to the disk or diaphragm 3 so that thedisk or diaphragm is held at its periphery between surfaces which are subjected to relatively high pressure at successive points while between such points the pressure is relatively low, the result being that the vibration of the disk or diaphragm is materiallymodified or controlled with'the effect of eliminating objectionable overtones and giving clear, pure tones free from harshness.

The means for vibrating the disk or diaphragm may be of any'usual form. As

here shown it consists of a lever 10 connected with the center of the disk or diaphragm and having trunnions 11 carried in bearings formed in ears 12 onthe periphery of the body or main member of the sound box. This lever is provided at its free end with a socket 13 for the usual needle or stylus.

While the apparatus as thus described produces very satisfactory results I prefer to use with it a damper or buffer, preferably in the. form of a disk 15 of paper or other nonrreverberant material. This damper or buffer is arranged between the disk or diaphragm 3 and the face of the body or main member 1 of the sound box resting on the corrugations 6. This damper disk is preferably cut away centrally, the cut out portion corresponding in diameter with the diameter of the central opening 2 and is glued or otherwise secured to one of the plates.

It will be understood that I do not herein claim the apparatus described and. shown as that forms the subject matter of a separate appllication filed by me of even date herewit Having thus described my invention what I claim i v 1. The method of mountin a diaphragm comprising the provision 0 a peripheral resilient gasket for the diaphragm and subjecting the diaphragm and gasket to regularly recurring relatively high and low pressures at right angles thereto.

2.-The me hod of controlling the vibra- .tion of a diaphragmcomprising the provision of a pheripheral resilient gasket for the diaphragm and subjecting the dia phragm andasket to regularly recurring relativel big and low pressures at right angles ereto and vibrating the center of the diaphragm.

This specification signed and witnessed this 10th day of July A. D. 1913.

ALBERT HAYES. In the presence of- WM. F. DOYLE, PARKER COOK.

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