US305927A - Geoege m - Google Patents
Geoege m Download PDFInfo
- Publication number
- US305927A US305927A US305927DA US305927A US 305927 A US305927 A US 305927A US 305927D A US305927D A US 305927DA US 305927 A US305927 A US 305927A
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- Prior art keywords
- diaphragm
- pole
- magnets
- piece
- cell
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- Expired - Lifetime
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- 238000012550 audit Methods 0.000 description 1
- 230000003292 diminished effect Effects 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
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Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
- H04R1/00—Details of transducers, loudspeakers or microphones
- H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
- H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only
- H04R1/24—Structural combinations of separate transducers or of two parts of the same transducer and responsive respectively to two or more frequency ranges
Definitions
- TELEPHONE 330313133 No. 305,927. Patented Sept. 30, 18.84.
- PETERS Mo-Ulhqmilln wmz m. ac.
- My invention relates to magneto receivingtelephones; audit consists in an arrangement of curved permanent magnets secured to the diaphragm at one end and attached at the other end to a central pole-piece common to all of the magnets, and carrying a helix for receiving the telephonic current.
- Figure 1 is asectioual View of my improved telephone-receiver
- Fig' 2 is a section taken on line a: w in Fig. 1.
- the diaphragm A is clamped on the cell 13 by the apertured cap 0.
- Three or more perinanent bar-magnets, D bent at right angles and then curved spirally, are secured by their straight ends to the diaphragm A, near its pcriphery, and their curved ends converge toward the center of the cell B, and are clamped by the washer a and screw b to the enlarged inner end of the pole-piece E, supporting the said pole-piece axially to the cell, and with the smaller end near but not touching the cen ter of the diaphragm.
- Upon the pole-piece E is mounted a helix, F, whose terminals-are connected with the wires of the telephonecircuit.
- auxiliary diaphragm, G Upon the back of the cell B, opposite the diaphragm A, and parallel with it, is secured an auxiliary diaphragm, G, by means of the cap H, and the center of the said diaphragm is secured to the washer c and pole-piece E ends of the bar-magnets to the pole-piece.
- the diaphragm G partakes, of the vibrations of the magnets and pole-piece, and it need not con sist of magnetic material.
- the cap H has a chamber, 0, which communicates with the space d between the diaphragm A and cap 0, through the passages 6, formed in the caps and in the body of the cell. lVhen changesoccur in the current traversing the helix F,
- the changes effected thereby in the magnetism 5 of the core E cause the alternate attraction and release of the diaphragm A, and a reciprocal attraction of the core, and a corresponding, although diminished, motion of the parts attached to the core, including the diaphragm G.
- the sounds produced by the diaphragm G areoommunicated to the car through the chamber 0, passages c, and space (I, and serve to re-enforce the sound proceeding from the diaphragm A.
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- Health & Medical Sciences (AREA)
- Otolaryngology (AREA)
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Signal Processing (AREA)
- Micro-Organisms Or Cultivation Processes Thereof (AREA)
Description
Remodel) G. M. HOPKINS.
TELEPHONE 330313133. No. 305,927. Patented Sept. 30, 18.84.
m PETERS: Mo-Ulhqmilln wmz m. ac.
UNITED STATES PATENT GEORGE M. HOPKINS, OF BROOKLYN, NEW YORK.
TELEPHONE-RECEIVER.
IEEGIPICATION forming part of Letters Patent No. 305,927, dated September 30, 1884.
Application filed February 29. 1884.
(No model.)
To all whom it may concern:
Be it known that I, GEORGE M. HOPKINS, a citizen of the United States, residing in Brooklyn, in the county of Kings and State of New York, have invented a new and useful Improvement in ReccivingTelephones; and I do hereby declare that the following is afull, clear, and exact description thereof, reference being had to the accompanying drawings, forming a part of this specification.
My invention relates to magneto receivingtelephones; audit consists in an arrangement of curved permanent magnets secured to the diaphragm at one end and attached at the other end to a central pole-piece common to all of the magnets, and carrying a helix for receiving the telephonic current.
It further consists in connecting an auxiliary diaphragm with the pole, for the purpose of utilizing the vibrations of'the said polepiece and thecurved magnets.
Figure 1 is asectioual View of my improved telephone-receiver, and Fig' 2 is a section taken on line a: w in Fig. 1.
The diaphragm A is clamped on the cell 13 by the apertured cap 0. Three or more perinanent bar-magnets, D, bent at right angles and then curved spirally, are secured by their straight ends to the diaphragm A, near its pcriphery, and their curved ends converge toward the center of the cell B, and are clamped by the washer a and screw b to the enlarged inner end of the pole-piece E, supporting the said pole-piece axially to the cell, and with the smaller end near but not touching the cen ter of the diaphragm. Upon the pole-piece E is mounted a helix, F, whose terminals-are connected with the wires of the telephonecircuit.
Upon the back of the cell B, opposite the diaphragm A, and parallel with it, is secured an auxiliary diaphragm, G, by means of the cap H, and the center of the said diaphragm is secured to the washer c and pole-piece E ends of the bar-magnets to the pole-piece. The diaphragm G partakes, of the vibrations of the magnets and pole-piece, and it need not con sist of magnetic material. The cap H has a chamber, 0, which communicates with the space d between the diaphragm A and cap 0, through the passages 6, formed in the caps and in the body of the cell. lVhen changesoccur in the current traversing the helix F,
the changes effected thereby in the magnetism 5 of the core E cause the alternate attraction and release of the diaphragm A, and a reciprocal attraction of the core, and a corresponding, although diminished, motion of the parts attached to the core, including the diaphragm G. The sounds produced by the diaphragm G areoommunicated to the car through the chamber 0, passages c, and space (I, and serve to re-enforce the sound proceeding from the diaphragm A.
Having thus described my invention, what- I claim as new, and desire to secure by Letters Patent, is-
The combination, with a series of converg ing bar-magnets clamped to a vibratory polepicce, of an auxiliary diaphragm located in the back of the receiver-case, and connected with the vibratory core, the said auxiliary diaphragm acting in conjunction with the usual diaphragm to re-enforce the sound, as specified.
GEORGE M. HOPKINS. Witnesses:
Oniis. L. Cons, HERMAN G. HAGES.
by the same screw, I), that binds the curved 5
Publications (1)
Publication Number | Publication Date |
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US305927A true US305927A (en) | 1884-09-30 |
Family
ID=2375096
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US305927D Expired - Lifetime US305927A (en) | Geoege m |
Country Status (1)
Country | Link |
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US (1) | US305927A (en) |
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0
- US US305927D patent/US305927A/en not_active Expired - Lifetime
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