US1643169A - Telephone receiver - Google Patents

Telephone receiver Download PDF

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Publication number
US1643169A
US1643169A US679147A US67914723A US1643169A US 1643169 A US1643169 A US 1643169A US 679147 A US679147 A US 679147A US 67914723 A US67914723 A US 67914723A US 1643169 A US1643169 A US 1643169A
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United States
Prior art keywords
pole piece
annular
coil
telephone receiver
leg
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
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US679147A
Inventor
Nyman Alexander
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DUBILIER CONDENSER Corp
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DUBILIER CONDENSER CORP
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Publication date
Application filed by DUBILIER CONDENSER CORP filed Critical DUBILIER CONDENSER CORP
Priority to US679147A priority Critical patent/US1643169A/en
Priority to GB2555224A priority patent/GB246556A/en
Application granted granted Critical
Publication of US1643169A publication Critical patent/US1643169A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02Details
    • H04R9/025Magnetic circuit

Description

Sept. 20, 1927. ,1 9
A. NYMAN TELEPHONE RECEIVER Filed Dec. '7, 1923 If a 4 I x 1 Y 1 Q a g -6 4, i In g 2 anon H601 Patented Sept. 20, 1927.
UNITED STATES PATENT OFFICE.
ALEXANDER NYMAN, or EAST ORANGE, NEW JERSEY, ASSIGNOR 'ro DUBILIER connnnsna coaroaa'rron, on NEW YORK, N. "2., A conroaarion'or DELAWARE.
TELEPHONE RECEIVER.
Application filed December 7, 1923. Serial No. 679,147.
This invention relatesto improvements in telephone receivers and more particularly to improvements in the construction of telephone loud speakers.
6 It is the object of the present invention to provide a compact and simple receiver of the dynamic type. With this object in view, I provide a receiver in which the pole pieces of the magnet structure are in close proximity to each other, an intense direct current field being provided by magnetizing a. centrally located leg of a substantially annular permanent magnet. Variations in this field are produced by means of a transformer coil which is held within the air gap of the magnet structure. The means-by which the receiver diaphragm is vibrated is arranged to move within this air gap.
' These and other features of the present invention will more clearly appear from the following detailed description of two exemplifications of the invention and the appended claims.
"In the drawings, Figs. 1 and 2 are sectional side views of two embodiments of the present invention.
Referring first to Fig. 1, a casing I mounted on a base 2 encloses the receiver structure comprising a permanent magnet 3. A substantially cylindrical wall 4 is fastened to the permanent magnet 3 by means of screws 5 or forms an integral part thereof. This permanent magnet has an upwardly projecting cylindrical leg 6 centrally provided with respect to the wall 4; and carrying a suitable energizing winding 7 provided within the cylinder 4 and connected with a direct current source, (not shown). The upper end of the cylindrical wall 4 carries a laminated pole piece 8 of-silicon steel or other material having a very high permeability. This annular pole piece 8 is welded or otherwise secured to the wall 4. An annular transformer coil is provided at 9 and held frictionally inside of the pole piece 8. The conductors through which the telephonic currents are transmitted are connected to this stationary coil. The end of the leg 6 of the magnet structure is surrounded by a substantially bell shaped cap or annular member 10 of aluminum or other light material suitably fastened to a diaphragm 11. The diaphragm 11 is clamped by means of a bell shaped holder 12 for born 13 against a ring 14 which in turn is mounted on the upper end of the casing 1.
It will be seen therefore that the cylinder or cap 10 is traversed by a relatively strong direct current ma netic field produced by means of the winding 7. This cap 10 is exposed also to alternating current induced by the speech currents through the agency of theannular coil 9 which will cause said cap to move up and down and thus to vibrate the diaphragm 11.
The structure disclosed in Fig. 2 is substantially like the one shown in Fig. 1 except that in addition to the laminated pole piece 8 provided on the wall 4, a similar pole piece 20 surrounds the upper end of the leg 6. Furthermore, the transformer coil 9 is wound around the pole piece 20 and is surrounded by the bell shaped cap 10. The operation of the device shown in this figure is the same as in the above case.
The annular pole pieces 8 and 20 are substantially concentric with the coil 9 so that the lines of force of the magnetic flux due to the coil 9 are parallel with the height of these annular laminations, that is to say,
parallel with the axis of these laminations and of the coil 9 where said lines of force pass through the laminations. In practice, the laminations should not be in the form of continuous rings, but should be cut in an axial direction so that the annular laminations are not short-circuited.
As will be understood, the variations of flux in the magnetic field create considerable losses in solid magnetic pole pieces. I therefore provide near the magnetic air gap the laminated parts 8 and 20 through which the alternating flux can pass freely without causing excessive hysteresis, or eddy current losses. With such a construction the alternating magnetic flux will be localized in these magnetic parts, while the permanent magnetic flux may continue to flow freely at right angles to the laminations.
Obviously, the magnetizing coil 7 for the permanent magnetic field may be omitted if the material for the magnet is of such nature as to retain its magnetization and form a permanent magnet. Such material is necessarily conducive to high hysteresis losses,
but with the alternating flux localized in the laminated parts, these losses will not take place in my invention.
What 1 claim is:
1. In a telephone receiver, a magnet com prising opposite poles, a transformer coil cooperating with said poles, and a laminated pole piece associated with at least one of said poles and surrounding said coil, said pole piece having its laminations substantially parallel to the portions of the lines of force of the flux due to the action of said coil which pass through said pole piece.
2. In a telephone receiver, a magnet comprising opposite poles, a transformer coil cooperating with said poles, and a laminated pole piece associated with at least one of said poles and having its laminations arranged to be substantially parallel with the portions of the lines of force of the flux due to the action of said coil which pass through the laminations. a diaphragm and a cap secured to said diaphragm and substantially concentric with said pole piece and said coil.
3. In a telephone receiver, a magnet structure comprising a permanent magnet having a leg subject to direct current magnetization provided between and in close proximity to the pole pieces of said permanent magnet, an annular laminated pole piece at the end of said leg, and a transformer coil wound around said last mentioned pole piece.
4. In a telephone receiver, a magnet structure comprising a cylindrical wall anda central leg the free end of which is in close proximity to the free end of said wall, a direct current energizing winding on said central leg and within said wall, an annular laminated pole piece secured to the upper end of said cylindrical wall, an annular transformer coil held Within said pole piece, an aluminum cylinder suspended between said transformer and the free end of said leg, and a diaphragm on which said aluminum cylinder is mounted.
In a telephone receiver, a base, a casing thereon enclosing a magnet structure con1- prising a cylindrical wall and a central leg the free end of which is in close proximity to the free end of said wall, a direct current energizing winding on said central leg and w thin said wall, two annular laminated pole pieces, one withinthe other and secured to the upper ends of said cylindrical wall and leg, respectively, an annular transformer coil provided between said pole pieces, an aluminum cylinder suspended between said transformer and one of said pole pieces, a diaphragm on which said aluminum cylinder is mounted, and means for clamping said diaphragm to said casing.
6. In a telephone receiver an annular pole piece, a cylindrical pole piece cooperating therewith, a transformer coil associated with one of said pole pieces, means for localizing the alternating magnetic flux produced by said transformer coil, an annular metallic member between said pole pieces, and a sound producing body connected to said member.
7. In a telephone receiver, a magnetic structure comprising an annular pole piece, a cylindrical pole piece cooperating therewith, a transformer coil associated with one of said pole pieces, means comprising laminated sheets of magnetic metal associated with said transformer coil, an annular 1netallic member between said pole pieces, and a sound producing body connected to said member.
In testimony whereof I aflix my signature.
ALEXANDER NYMAN.
US679147A 1923-12-07 1923-12-07 Telephone receiver Expired - Lifetime US1643169A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
US679147A US1643169A (en) 1923-12-07 1923-12-07 Telephone receiver
GB2555224A GB246556A (en) 1924-10-27 1924-10-27 Improvement in telephone receivers

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US679147A US1643169A (en) 1923-12-07 1923-12-07 Telephone receiver

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494918A (en) * 1946-09-17 1950-01-17 Volkers & Schaffer Inc Inductively energized electro-dynamic loud-speaker
US2515683A (en) * 1946-12-20 1950-07-18 Jose W Acosta Circuit coupling device for highfrequency therapeutic apparatus
US3112375A (en) * 1960-01-20 1963-11-26 Mechanies For Electronic Inc Loudspeaker construction

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2494918A (en) * 1946-09-17 1950-01-17 Volkers & Schaffer Inc Inductively energized electro-dynamic loud-speaker
US2515683A (en) * 1946-12-20 1950-07-18 Jose W Acosta Circuit coupling device for highfrequency therapeutic apparatus
US3112375A (en) * 1960-01-20 1963-11-26 Mechanies For Electronic Inc Loudspeaker construction

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