US1743011A - Speech-current apparatus - Google Patents

Speech-current apparatus Download PDF

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Publication number
US1743011A
US1743011A US254296A US25429628A US1743011A US 1743011 A US1743011 A US 1743011A US 254296 A US254296 A US 254296A US 25429628 A US25429628 A US 25429628A US 1743011 A US1743011 A US 1743011A
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United States
Prior art keywords
pole pieces
diaphragm
speech
coil
layers
Prior art date
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
Application number
US254296A
Inventor
Arthur G Zimmerman
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
General Electric Co
Original Assignee
General Electric Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority to DEI27604D priority Critical patent/DE540445C/en
Priority to GB933226A priority patent/GB250931A/en
Priority to FR31813D priority patent/FR31813E/en
Application filed by General Electric Co filed Critical General Electric Co
Priority to US254296A priority patent/US1743011A/en
Priority to DEI36783D priority patent/DE542881C/en
Priority to FR37083D priority patent/FR37083E/en
Priority to GB499829A priority patent/GB306044A/en
Application granted granted Critical
Publication of US1743011A publication Critical patent/US1743011A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/02—Details

Definitions

  • My invention relates to speech current generators and motors, and has for its principal object the provision of an improved apparatus which may be ly operated either to convert speech current into sound or to generate electric current which is dependent on sound,
  • apparatus may be improved by the provision of conductive rings of copper or similar low resistance materials embedded in the pole pieces of the magnet through which the magnetic field surrounding the movable coil is: produced.
  • the con ductive rings embedded in the pole pieces form low resistance secondary circuits which reduce the reactive component oi the diaphragm coil impedance and increase the op erating efiiciency of theapparatus.
  • ac- ,cordance with my invention is further increased by making the conductive rings in the form of layers of conductive material which are rolled, electroplated orotherg wise placed on the active surfaces of the pole pieces. This arrangement of the conductive rings has the important advantage that it perm-its very close coupling between these rings and the movable diaphragmcoil, thusgreatly decreasing the inductance of the movable coil.
  • Fig I-is asec- 'tional view of a speechcurrent apparatus wherein my invention has been embodied
  • FIG. 2 and 3 illustrate various details of the pole pieces oi this apparatus.
  • This apparatus includes a coil 4 which is mounted on a diaphragm 5 and is arranged to move between the pole pieces 6 and 7 of a m'agnet shown as'provided with a field or excitlngcoil' 8. As shown more clearly in X is provided Figs. 2 and 3, the [pole piece 6 with a copper lining 9 and the pole piece 7 is provided with a copper covering 10.
  • the conductive coverings 9 and 10 may be made very thin and may extend somewhat beyond the active areas of the pole pieces so that the flux of the magnet is highly concentrated in the path of the moving'diaphragm coil 4. Under these conditions, the apparatus has been found to operate very efficiently when utilized to convert speech current into sound or vice versa. : While both the pole pieces have been shown as” provided with a C0111 ductive covering, it should be understood that similar results may be secured by increasing the thickness of one of the coatings and omitting the other coating.
  • a speech current apparatus including a pair of magnetic pole pieces, layers of nonmagnetic conductive material arranged to cover the active areas of both of said pole pieces, a diaphragm, and a .coil mounted on said diaphragmandarranged to move between said layers ofnon-magnetic' conductive materiah' 3.
  • a speech current apparatus including a pair of magnetic pole pieces, layers of copper arranged to cover ⁇ the active areas of both of said pole pieces, a diaphragm, and a coil mounted on said diaphragm and arranged to p move between said layers of copper.
  • a speech current apparatus including a pair of magnetic pole pieces, the active area of one of said pole pieces being electro-plated whereby it is covered with a thin 1a. er of conductive, material, a diaphragm, an a coil mounted on said diaphragm and arranged to move between said pole pieces.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)

Description

Jan. 7, 1930. ZIMMERMAN 1,743,011
SPEECH CURRENT APPARATUS Filed Feb. 14, 1928 Inventor- Arthur GZim'mePman 9 w Hi2; Afiohh eg Patented Jan. 7, 1930 UNITED STATES Parser-onion ARTHUR, G. ZI-MMERMAN, or scnnnncrnnr, new YORK, ASSIGNOR 13o GENERAL ELEC- 'rnro COMPANY, A oonronmnon or NEWYYORK SPEECH-CURRENT APPARATUS Application filed February 14, 1928. Serial No. 254,296. I
My invention relates to speech current generators and motors, and has for its principal object the provision of an improved apparatus which may be eficiently operated either to convert speech current into sound or to generate electric current which is dependent on sound,
Various types of speech current have been provided in the past. Many of these apparatus include a coil which is mounted on a diaphragm and is arranged to move in a magnetic field either in response to speech current supplied to the coil or in response to sound impulses applied to the diaphragm. 1
As pointed out in Patent No; 1,?07,570, issued April 2, 1929, to Chester W. Rice, and assigned to the same assignee as the present application, apparatus may be improved by the provision of conductive rings of copper or similar low resistance materials embedded in the pole pieces of the magnet through which the magnetic field surrounding the movable coil is: produced. With this construction, the con ductive rings embedded in the pole pieces form low resistance secondary circuits which reduce the reactive component oi the diaphragm coil impedance and increase the op erating efiiciency of theapparatus. In ac- ,cordance with my invention, is further increased by making the conductive rings in the form of layers of conductive material which are rolled, electroplated orotherg wise placed on the active surfaces of the pole pieces. This arrangement of the conductive rings has the important advantage that it perm-its very close coupling between these rings and the movable diaphragmcoil, thusgreatly decreasing the inductance of the movable coil.
My invention will be better.understood from the following description when considered in connection with the accompanying drawings and its scope will be pointed out in the appended claims. v
. Referring to the drawings, Fig, I-is asec- 'tional view of a speechcurrent apparatus wherein my invention has been embodied,
apparatus the operating efficiency of such this efiiciency and Figs. 2 and 3 illustrate various details of the pole pieces oi this apparatus.
This apparatus includes a coil 4 which is mounted on a diaphragm 5 and is arranged to move between the pole pieces 6 and 7 of a m'agnet shown as'provided with a field or excitlngcoil' 8. As shown more clearly in X is provided Figs. 2 and 3, the [pole piece 6 with a copper lining 9 and the pole piece 7 is provided with a copper covering 10.
It will be readily understood that the conductive coverings 9 and 10 may be made very thin and may extend somewhat beyond the active areas of the pole pieces so that the flux of the magnet is highly concentrated in the path of the moving'diaphragm coil 4. Under these conditions, the apparatus has been found to operate very efficiently when utilized to convert speech current into sound or vice versa. :While both the pole pieces have been shown as" provided with a C0111 ductive covering, it should be understood that similar results may be secured by increasing the thickness of one of the coatings and omitting the other coating.
pair of magnetic pole-pieces, layers of con- 'ductive material arranged to cover the active areas of both of said pole pieces, a diaphragm, and a coil mounted on said'diaphragm and arranged to move between said layers of conductive material. r
2. A speech current apparatus including a pair of magnetic pole pieces, layers of nonmagnetic conductive material arranged to cover the active areas of both of said pole pieces, a diaphragm, and a .coil mounted on said diaphragmandarranged to move between said layers ofnon-magnetic' conductive materiah' 3.. A speech current apparatus including a pair of magnetic pole pieces, layers of copper arranged to cover \the active areas of both of said pole pieces, a diaphragm, and a coil mounted on said diaphragm and arranged to p move between said layers of copper.
' 4. A speech current apparatus including a pair of magnetic pole pieces, the active area of one of said pole pieces being electro-plated whereby it is covered with a thin 1a. er of conductive, material, a diaphragm, an a coil mounted on said diaphragm and arranged to move between said pole pieces.
In witness whereof, I have hereunto set my hand this 13th day of February, 1928.
ARTHUR G. ZIMNIERMAN.
US254296A 1925-01-09 1928-02-14 Speech-current apparatus Expired - Lifetime US1743011A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
DEI27604D DE540445C (en) 1925-04-20 1926-03-07 Electrodynamic loudspeaker with a ring coil through which the speech currents flow
GB933226A GB250931A (en) 1925-04-20 1926-04-08 Improvements in and relating to sound-reproducing apparatus, such as loud speakers
FR31813D FR31813E (en) 1925-01-09 1926-04-15 Improvements to sound-producing devices
US254296A US1743011A (en) 1928-02-14 1928-02-14 Speech-current apparatus
DEI36783D DE542881C (en) 1925-04-20 1929-01-19 Electrodynamic loudspeaker
FR37083D FR37083E (en) 1925-01-09 1929-02-08 Improvements to sound-producing devices
GB499829A GB306044A (en) 1925-04-20 1929-02-14 Improvements in and relating to sound reproducing apparatus

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US254296A US1743011A (en) 1928-02-14 1928-02-14 Speech-current apparatus

Publications (1)

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US1743011A true US1743011A (en) 1930-01-07

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950161A (en) * 1956-04-03 1960-08-23 Ibm Coaxial magnetic printing head
US4334127A (en) * 1979-06-30 1982-06-08 Pioneer Electronic Corporation Magnetic circuit for planar diaphragm type loudspeaker
WO1994018806A1 (en) * 1993-02-08 1994-08-18 Aura Systems, Inc. Double ended field coil actuator

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2950161A (en) * 1956-04-03 1960-08-23 Ibm Coaxial magnetic printing head
US4334127A (en) * 1979-06-30 1982-06-08 Pioneer Electronic Corporation Magnetic circuit for planar diaphragm type loudspeaker
US5768395A (en) * 1991-07-16 1998-06-16 Aura Systems, Inc. Double ended field coil actuator
WO1994018806A1 (en) * 1993-02-08 1994-08-18 Aura Systems, Inc. Double ended field coil actuator

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