US963954A - Telephone-receiver. - Google Patents

Description

- S. S. SONNEBORN.

TELEPHONE BEOEIVER.

APPLICATION 211.121) mu 1a, 1909.

Patented July 12, 1910.

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SOL S. SONNEBORN, OF NEW YORK, N. Y.

TELEPHONE-RECEIVER aeaeea.

Specification of Letters latent.

Patented July 12, lore.

Application filed May 18, 1908. Serial-No. 433,600.

To all whom it may concern:

Be it known that I, Son S. Sonnnnonn, a citizen of the United States, residing at the city of New York, in the borough of Brooklyn and State of New York, have mvented certain new and useful Improvements 1n Telephone-Receivers, of which the following is a full, clear, and exact description;

This invention relates to telephone receivers, the principal object belng to improve the sensitiveness and efiiciency of instruments of this class, whereby better results can be attained with telephone systems, telemagnet does not to overcome these graphones, and other apparatus where telephone receivers are used.

The ordinary telephone receiver makes use of a single diaphragm of magnetic material which is vibrated by an electro-magnet in the telephone circuit. It is found in practice that diaphragms of more than a certain size and thickness cannot be efficiently employed, but it frequently happens that a diaphragm of this size with its corresponding utilize all the electrical energy of the telephone circuit. Moreover, in an ordinary instrument, the sound is taken from only one side of the diaphragm and the vibration transmitted to the air on the under side of the diaphragm is'practically wasted.

It is the purpose of my present invention drawbacks and providefa receiver in which diaphragms of the standard size and thickness may be employed, but in which the full energy of the electrical circuit is utilized. With this object in view, I provide two separate diaphragms which vibrate in synchronism underthe influence of magnets in the telephone circuit, and which are so arranged that the air vibrationson both sides of both diaphragms are combined into a single volume of sound at the earpiece of the instrument.

My invention further consists in the features of construction and combination as hereinafter set forth and finally particularly pointed out in the appended claims.

In the drawings: Figure 1 is a vertical sectional view of atelephone receiver embodying the principles of my invention; Fig. 2 is an end view of certain of the interior parts; Fig. 3 is a vertical sectional view of a modified form of the invention, and Fig. 4

is an end view of the same with the cap and diaphragm removed.

Referring to the drawings, in which like parts are designated by'the same reference sign, 1 indicates a casing which may be of metal or insulating material and which may form part of a fixed frame or support, or which may be the housing of a watch-form type of receiver, as in Fig. 1.

2 designates an imperforate cap screwed on one open end of the casing 1, and 3 is a cap havlng a central perforation 4 and adapted to constitute an ear-piece. Within the casing 1 there is supported in any suitable manner a magnet 5 having one or more pole pieces (Sand 6 projecting in opposite directions axially of the casing 1. I have shown a convenient method of mounting the magnet 5, and consisting in a plate or body 7 o insulating material in which the magnet 5 is embedded, and which is moldedinto the casing 1, the latter being beaded at 8 to afford a firm supporting engagement. 9

designates magnet bobblns or windings which may be included in series or multi arrangement in a telephone circuit.

The diaphragms are supported within the casing 1 in a special manner, constituting an important feature of my invention. In place of securing the diaphragms closely within the casing, I provide cups or shells 10 with screw caps 11 adapted to clamp and hold diaphragms 12 of the ordinary ferrotype construction. Two of these cups or shells are provided, and are assembled upon opposite sides of the plate or body 7 so as to surround and inclose the magnet bobbins 9. For this purpose the cups are cut away at their lower faces and are assembled upon the magnet by fastening screws 13. In this relation the diaphragms 12 are held in close but properly spaced-apart relation from the magnet poles 6, 6, so as to be in operative or telephonic relation therewith. The cups or shells 10 are not closely contained in the casing 1, but fit therein so as to leave a considerable annular space or passage 14 between their outside surfaces and the adjacent wall of the casing 1-. '15 designate a series of perforations in the cups or shells 10 by which a free communication is established between their interiors and the space vibrations directly to the ear of the operator,

from its upper face, and, at the same-time, the vibrations of the air beneath this diaphragm are transmitted through the openlugs 15 of this chamber and around through the adjacent annular passage 14 to assist the vibratlons from the upper side of this diaphragm. I am aware of the fact that there may be aphase difference in the vibrations from the two sources, but I find in practice that, notwithstanding this theoretical consideration, the practical effect is to augment the sound which finally issues through the orifice 4. In exactly the same way the sound waves are taken from the lower and the upper faces of the lower diaphragm 12 which is adjacent to the oles 6. This sound passes through the ad acent-openings 15 and the adjacent annular passage 14, upward through the holes 17 and into the cavities already described, where it becomes merged into the sound from the upper diaphragm 12. In this way the sound received by the operator is compounded from four different sources, the waves from which are merged together into a single volume of sound. It is found in practice that, not only is the sound of greater intensity, but of much greater purity, by virtue of this arrangement.

In Figs. 3 and 4 I have shown a slightly modified form of the invention embodied in a bi-polar receiver of substantially standard form, instead of the watch-form type of Figs. 1 and 2. In this case bar magnets 20 are employed with soft iron polar extensions '21 and 21' at their respective ends. 22 designates the magnet bobbins or windings which surround the poles 21 in the usual manner.. I form the magnets 20 permanentl embedded in the casing or housing 23 o insulating material, and which has a chamber or cavity 24 at'eachendin which the dia hragm and the magnet bobbins are receive 25 designates holes or passages extending from end to end of the body or housing' 23 and which serve 'to put the cavities 24 at the respective ends in free communication with one another. The interior walls of the cavities 24 are not made round and continuous, but are deeply notched or otherwise recessed or mutilated, as designated at 26, at aplurality of. points spaced thereabout. Between the notches 26 there is formed an annular cavity 27 in which is received a diaphragm 28. 29 designates a clampin ring screwed into the threaded ortion o the cavity 27 to engage and holld. the diaphragrmf The construction of the arts at each end of the receiver is identical in'all respects, except that at the lower end there is provided an imperforate cap 30 to completely inclose the chamber 24 at this end, while at the other end of the receiver there'is provided a centrallyapertured cap 31 of substantially the ordinary form in a telephone receiver.

The operation will be suificiently understood from that of the modification reviously described. It is evident that the sound from both sides of both diaphragms is combined and issues in a single volume through the opening of the upper cap 31. The notches 26 in this case serve in place of the holes 15 and the assages escribed.

What I claim is 1. A telephone receiver comprising 9. diaphralgm, a magnet, a ring supporting said d ap ragm, and a casing surrounding said ring and ada ted to establish an annular space around t e same, said space establishing communication between opposite sides of the diaphragm.

2. A telephone receivercomprising a permanent magnet having a plurality of poles, a plurality of diaphragms cotiperating therewith, a casing havm a single ear-piece orifice, anda cup-shape art having perforations whereby the sound vibrations from all of said diaphragms are combined to issue through said orlfice.

3. A watch-form ing a casing,'a therein and having oles, a plurality of diaphragms transverse y disposed to the axis of said casing, and members having perforations to permit the sound waves from both sides of both of said'diaphragms to be combined.

4. A telephone receiver comprising a mag mg said poles, a casing surrounding said cups and providing an annular space In conjunction therewit and diaphragms supported by said cups in proximity to sald magnet poles.

5. A telephone receiver comprising a permanent magnet having a plurality of oles, a plurality of diaphragms cotiperatingt erewith, a caslng having a single ear-piece orifice; and means whereby the sound vibrainternally threaded type of receiver comprispermanent magnet embodied III net having poles, perforated cups surroundtions from both sides of all of said dia- Waves from both sides of all of said diaphragms are combined to issue through said phragms are combined. 10

orifice. In witness whereof, I subscribe my signa- 6. A watch-form type of r eiv r compristure, in the presence of two witnesses.

ing a casing, a permanent magnet embodied SOL S. SONNEBORN.

therein and having poles, a plurality of dia- Witnesses:

phragms transversely disposed to the axis Jorm F. Boss,

of said casing, and means whereby the sound MICHAEL DocK'rER, J r.

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