US1534911A - Telephone receiver - Google Patents

Description

April 2 1, 1925 1 534911 R. C. BROWNE v TELEPHONE RECEIVER Filed March 12, 1925 To all whom it may concern:

.oeivers, of

Patented Apr. 21, 1925.

UNITED STATES PATENT oF cE.

RALPH C. IBROKIIYI'E, OF SALEM, MASSACHUSETTS.

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Application filed March 12, 1923. Serial No. 624,510.

pecially adapted for use with radio. It is,

of course, to be understood that, without material modification or alteration, the apparatus is applicable for other useswhere amplifying of sound waves is desired.

One of the objects of the present mventlon is to provide instruments of the above general character which will produce tones true in character, great in volume, andcapable of great accuracy.

A furtheizobject is to provide a telephone receiver of the above character which may be inexpensively manufactured and assem bled.

A further object is to provide a'receiver of the above character having relativelv few parts which will render the'same light and compact, whereby it may be conveniently transported.

A further object is to provide a deviceof the above character particularly adapted for use with radio sets for amplifying and reproducing sound waves in a clear and distinct ratus of the above general character which will be more eflicient and reliable in use in that the damping effects of 'the magnetic field are eliminated as much as possible and the intensity of the reproduced sound is increased. 1 I

Other objects will be in part obvious from the annexed drawing and in part indicated from the following analysis of the'invention.

The inventionaccordmgly consists in the features of construction, combination of parts, and in the unique .relation of the vaing and dispositioning thereof, all as more clearly outlined herein.

To enable others skilled in the art to fully comprehend the underlying features thereof in order that they may embody the same, by numerous modifications in structure and relation contemplated by this invention, drawings de icting the preferred forms have been annexe as part of this disclosure and in such drawings like characters of reference indicate corresponding parts throughout all the views, of which Figure 1 is a semi-diagrammatic perspective view of such parts of the invention as are necessary tofully understand the invention Figure 2 is a central sectional view of a slight modification;

Figure 3 is detail view showing certain parts diagrammatically; and

Figure 4 is a conventional diagram. of'the device ina transformer circuit.

Referring now to the drawings in detail, and more particularly Figure 1, 5 indicates an electro-magnet, one .pole piece of which is indicated at 6 and a part of the other one at 7. These pole pieces are tapered towards their adjacent edges, as indicated at 8, and

the effective adjacent surfaces '10 of each curves relatively downwardly, as shown more clearly in Figure 2. I wish the term' effective surfaces to be given a broad interpretation. While, of course, certain lines of force will be set up between the tapered portions 8 of the pole pieces the maximum portion of the field will extend between these adj acent parallel curved surfaces 10. These surfaces are curved downwardly to conform" with a correspondingly curved conductor 11, I have found, by experience, that by curving the conductor in this manner, perfect results are obtained, and a louder, more efficient and clearer tone is produced. The curvature or bend permits the conductor to be vibrated freely as the same is underno tension. This enables the conductor to vibrate uniformly with the wave of the telephonic current, and

when connected directly to the diaphragm also frees the latter from any undesirable tension; This conductor 11 may be mounted as shown in Figure 2, that is, between an insulated binding post 12 and the diaphragm 13, or, if preferred, the conductor 11 may be supported by spring brackets 14 secured as shown in Figure 1, and the central part where the maximum vibrations occur is connected by means of a vertically disposed rod 15, which is connected to a second connecting member 16 interposed between a relatively fixed and insulated binding post 17 and the diaphragm 18, shown in Figure 1. Both the members 11 and 16 are positioned substanto, and insulated from, the polepieces 6 and rious members and the relativeproportion- 7 tially parallel and in the same vertical plane, the central parts of each being connected by the-link or connecting bar 15, although this is not absolutely necessary, for obviously the member 16 might be turned 90 or any fractional part thereof, horizontally about the end of the member 15 as a pivot point. The point that'should be emphasized and borne in mind primarily is the connecting of the members 11 and 16 by the member 15 at their central parts, whereby the greatest amplification or vibration of one will be transmitted to the other with a corresponding effect on thediaphragm 18. 15

With this arrangement and peculiar construction of the pole pieces, I find that a'telephonic current entering and allowed to traverse the conductor 11 will cause the same to be thrown into vibration in synchronism with the polarization or wave. of the telehonic current. The'magnetic field set up etween the-pole pieces 6 and 7 is localized to conform to the curvature of the vibrating conductor 11 and stray and eddying lines of force which produce damping effects are eliminated. It will be noted that the vibra-s tions occurring in the conductor 11' have two components, that-is, transverse, and longitudinal. The longitudinal'components are utilized in either moving the diaphragm13 directly, as iii-Figure 2, or indirectly through the'connecting-links, as in Figures 1 and '3.

, the tones reproduced are of great volume and more true in character, and also require less energy. in field current.

Without further analysis, the foregoing will so fully reveal the gist of this invention that others can, by applying current knowledge, re'adily adapt it for various applications without omitting certain features that, from the standpoint of the prior art, fairly constitute essential characteristics ofthe generic or specific aspects .of this invention and, therefore, such adaptations should and are intended to be comprehendedwithin the meaning and range of equivalency of the following claims.

I claim:

1. A telephone receiver comprising two oppositely disposed pole pieces adapted to create a magnetic? field therebetween, a single conductor within said field, a diaphragm,

, and means connecting said diaphragm with said conductor comprising a member centrally connected with the diaphragm and a member extending between said first member and said conductor.

2. A telephone receiver comprising oppositely disposed pole pieces adapted to create a magnetic field therebetween, a conductor positioned in said field and a diaphragm connected with said conductor, said conductor being curved and the adjacent surfaces of the pole pieces being parallel and curved correspondingly to the curvature of said conductor throughout their effective lengths.

3. A telephone receiver comprising two pole pieces for forming a magnetic field therebetween, a single conductor positioned in said field, a diaphragm adapted to be actuated by vibration of the conductor, the adjacent surfaces of said pole pieces and conductor being correspondingly curved and parallel throughout their respective lengths.

4. A telephone receiver comprising two oppositely disposed pole pieces, the adjacent surfaces of which are parallel and curved throughout their effective length, said pole pieces adapted to create a magnetic field between said adjacent surfaces, a single conductor positioned in said field and curved to conform with the curvature of the adjacent surfaces of said pole pieces, whereby the magnetic field set up is concentrated along the length of said conductor.

5. A telephone receiver comprising oppositely disposed poles, tapered to a relatively narrowface, for creating amagnetic field therebetween, said poles having their adja-' cent faces parallel, one of the poles being curved throughout its effective face length.

6. 'A telephone receiver comprising oppositely disposed pole pieces havin their adjacent faces parallel and adapted to create a magnetic field therebetween, one' of said pole piecesbeing curved in the direction of its effective face length, and a conductor po sitioned withinsaid field.

7. A telephone, receiver comprising oppositely disposed poles for creating a magnetic field therebetween the adjacent surfaces of said pole pieces being parallel, one

of said pole pieces being curved throughout its effective length, and a conductor positioned within said field, said'conductor beingcurvedthroughout its lengtlr corresponding to the curvature of said pole piece. 8. A telephone receiver comprising 0 po-' sitely disposed pole pieces tapered to orm relatively narrow faces for creating a magnetic field therebetween, a conductor extending transversely through said magnetic field, said conductor and the adjacent faces of said pole pieces being parallel and correspondingly curved in the direction of their eflective lengths.

Leeann 9. A telephone receiver comprising oppositely disposed pole pieces for creating a magnetic field therebetween, a conductor extending transversely through said magnetic field, the adjacent surfaces of said pole pieces and said-conductor being correspondingly curved throughout their effective lengths, and a diaphragm adapted to be actuated by vibrations of said conductor.

10. A telephone receiver comprising oppositely disposed pole pieces for creating a magnetic field therebetween, a single conductor extending transversely through said magnetic field, the adjacent surfaces of said pole pieces and said conductor being correspondingly curved throughout their effective lengths, and a diaphragm adapted to be actuated by vibrations of said conductor, said diaphragm being positioned at substantially right angles to the length of said conductor.

11. A telephone receiver comprising oppositely disposed pole pieces for creating a magnetic field therebetween, a bent conductor extending transversely through said magnetic field, the adjacent surfaces of said pole pieces being parallel and curved to conform to the curvature of said conductor throughout their effective lengths, and a diaphragm adapted to be actuated by vibrations of said conductor, said diaphragms being positioned at substantially right angles to the length of said conductor, and two intermediate members positioned at substantially right angles to each other connecting said diaphragm with the conductor.

12. A telephone receiver comprising oppositely disposed pole pieces for creating a magnetic field therebetween, a conductor extending transversely through said magnetic field, the adjacent surfaces of said pole pieces being parallel and curved throughout their entire lengths,

and a diaphragm adapted to-be actuated by vibrations of said conductor, said diaphragm being positioned,

at substantially right angles to the length of said conductor, and two intermediate members positioned at substantially right. angles to each other connecting said diaphragm with the conductor, one of said members being substantially parallel to said cundUCtOl'.

13. A telephone receiver comprising two oppositely disposed pole pieces, the adjacent surfaces of which are parallel and curved throughout their efiective lengths, thereby to create an intensified magnetic field thercbetween, and a conductor correspondingly curved and positioned between said adjacent faces of said pole pieces, spring supports for the opposite ends of said conductor, a diaphragm and connecting means between the diaphragm and said conductor.

l l. A telephone receiver comprising two oppositely disposed pole pieces, the adjacent surfaces of which are parallel and curved throughout their effective lengths, thereby to create an intensified magnetic field therebetween, and a conductor correspondingly curved and positioned between said adjacent faces of said pole pieces, spring supports for the opposite ends of said 0011-' ductor, a diaphragnr and connecting means between the diaphragm and said conductor, said conducting means comprising a member secured to said diaphragm and positioned substantially parallel to said conductor, and a member connecting'the central parts of said conductor and said first mentioned connecting member.

In witness whereof I have hereunto signed my name.

RALPH C. BROWNE.

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