US1124413A - Transmitter. - Google Patents

Description

H. GERNSBAGK.

- TRANSMITTER.

APPLICATION FILED MAY16,1913.

Patented Jan. 12, 1915.

WITNESSES 1 STA EFT airmen.

means.

Specification of Letters Patent.

Patented Jan. f2, 1915.

Application filed May 15, 1913. Serial No. 767,888.

To all whom it may ooncem Be itknown that I, Hnco GERNsBAcK, a citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Transmitters, of which the following is a specification, reference being had therein to the accompanying drawing.

This invention relates to transmitters and has for its object the production of a simple and eflicient transmitter which may be manufactured at a minimum cost and which may be readily attached to a telephone without the necessity of binding screws and the like as now in common use.

Another object of this invention is the production of a simple and eflicient transmitter which may be held upon the mouthpiece of a telephone in a vertical position.

With these and other objects in view, this invention consists of certain novel constructions, combinations and arrangements of parts, as will be hereinafter fully described and claimed.

In the drawings :Figure 1 is a vertical sectional view through the mouth-piece-casing of the telephone showing the transmitter in elevation. Fig. 2 is a central vertical section through the transmitter. Fig. 3 is a section taken on line 33 of Fig. 2 of the transmitter. Fig. 4 is a modified form of the invention. Fig. 5 is a detail perspective of the supporting ring for the transmitter. Fig. 6 is a top plan view of the transmitter.

By referring to the drawings, it will be seen that 1 designates the mouth-piece casing or transmitter casing which carries the usual mouth-piece 2, and this mouth-piece is secured to a cap 2 which is threaded upon the mouth-piece or transmitter casing, as illustrated in Figs. 1, 2 and 4, and a transmitter supporting disk 3 engages the rear face of this insulated cap 2.

An insulated ring 5 is secured to the rear face of the supporting disk 3 as illustrated in Fig. 2 by means of glue or shellac. It is preferable to shellac the insulated ring 5 to the disk 3 so as to allow the same to be readily removed when it is so desired. It will be seen that .it is not necessary to have any binding or.securing screws for the disk as illustrated in the present invention, thereby reducing materially in the cost of installation. This insulated ring 5 may be formed of any insulated material but is preferably formed of fiber or felt.

A diaphragm disk 6'is secured to the rear face of the supporting disk 3 and is held upon this disk by means of theinsulated ring 5 and the binding insulating ring 7. This insulating ring 7 may, like the ring 5, be formed of any desired insulating material but fiber or felt are preferable. This diaphragm disk 6 is preferably formed of copper foil which is preferably tinned and may be as thin or thinner than No. 40 B. &

S. gage, although if it be so desired the dia;

phragm .disk 6 may be formed of brass of a. thickness of No. 36 B. & S. gage. By having the insulating ring 7 formed of felt, the felt will materially deaden the extra vibrations ofthe rim of the diaphragm and for this reason I preferably employ felt in connection with this ring 7 It is, of course, necessary that the diaphragm 6 should be in metallic connection with the supporting disk 3 which disk 3 is used as one of the connections of the transmitter.

'A rear plate or disk 8 of substantially three times the thickness of the diaphragm 6 or as heavy as the ring or disk 3 is shellacked to the rear face of the ring 5 and thereby constitutes a rear closure for the transmitter. After the glue or shellac which may be used has dried the transmitter will constitute a substantially one-piece structure.

Within the space between the diaphragm disk 6 and the disk or plate 8 there is placed carbon grains 9 for the purpose of constituting an efficient conductor'or transmitter. The grains 9 should not fill the chamber 10 too full for if the grains completely fill the chamber 10, it will not be able to produce an efiicient transmission. From practical experience it has been found that it is advisable to fill the chamber 10 about seveneighths full in order to make the clearest speech, and it should be understood that the plates 3 and 9 will constitute the respective poles of the transmitter.-

By' use of the present device, it will be seenthat the transmitter may be held in a vertical position and it will not be necessary to have the transmitter lie in a horizontal position as is now previously done, and in the present device it has been found that the invention operates more perfectly when in a vertical position than if the same were in a horizontal position. v

The disk 3 is formed of very rigid material so as to prevent the same from vibrating and constitutes an efficient base or support for the vibrating or transmitting disk or diaphragm 6. The plate 8 is also formed of heavy material so as to prevent the same from vibrating and these plates will constitute eflic'ient closures for the transmitter. It should be understood that the plates 8 and 3 may be made of any suitable metal, carbon, or other material, and it is not desired to limit the present invention to the particular material above named.

As illustrated in Fig. 4 there is shown a modified form of the invention wherein a supporting disk 3 is formed similar to that as illustrated in Fig. 2 and to this disk is shellacked or glued an insulating ring or disk 11-which is provided with a lower beveled face 12 and this beveled face 12 is engaged by a spring metal ring 18 for holding the diaphragm it in a firm position against the non-vibrating disk 3.

To the rear face of the insulating ring 11 is secured a plate 15 by means of shellac, glue, or other substance, shellac being preierred, and the disk or ring 11 is preferably formedoi felt or fiber as above described, but any suitable insulated means may be used. The compartment 15 is filled with carbon grains 16 similar to that illustrated in Fig. 2, and the compartment is preferably filled seven-eighths full so as to keep the grain loose and permit an eihcient transmission of the sound.

From the foregoing description, it will be seen that a very simple and eliicient trans mitter has been roducedwherei-nthe parts may be formed of material so as to make the device very cheap in construction and also to allow the easy assembling of the several parts upon the disk 3, and in view of the fact that binding screws or the like are not necessary in the present device, it will be noticed that considerable labor will be eliminated in installing the transmitter upon the telephone.

()fcourse, it should be understood that the present device may be used and is intended to be used in connection with the ordinary telephone and if builton a larger scale, by making the diameter of the grain chamber vastly larger than in an ordinary transmitter, the'device becomes especially efi'ective when used in connection with transmitters for wireless telephony. In transmitters used at present in wireless telephony only a very small grain chamber'is provided which heats up very quickly when large currents are used. In my transmitter to the contrary is adapted to support the receiver and constitute a receiver hook, and this transmitter casing 1 may be provided witha contact member 19 for engaging the rear face of the disk 8 and constitute an electrical connection therefor. The receiver hook 18 is provided with a downwardly projecting fing'er 20 which is adapted to form a contact with the contact member 21.

7 It should be understood from the forms illustrated in Figs. 2 and i that the contact with the disk 3 is made through the contacting member 17 as illustrated in the above mentioned figures, and the contact with the disk 8 and 15 in Figs. 2 and 4: respectively is formed through the contact member 22.

Having thus described the invention, what I is claimed as new is 2-- A transmitter of the class described comprising a non-vibrating supporting disk, an insulating member secured to the rear face of said non-vibrating plate by means of adhesive material, a vibrating diaphragm securedto the rear face of said non-vibrating plate, a second binding insulating member positioned within said first mentioned insulating member and engaging said diaphragm, a second non-vibrating plate secured to the opposite face of said insulating members, and spaced from said diaphragm disk, and carbon grains loosely placed between said second mentioned non-vibrating plate and said diaphragm disk.

In testimon whereof l hereunto afiix m 110 signature in presence of two witnesses.

HUGQ GERNSBACK. Witnesses HAmzr W. Snoon, 'lnnononn L. 'DIEBOLD.

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