US1676668A - Telephone transmitter - Google Patents

Telephone transmitter Download PDF

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Publication number
US1676668A
US1676668A US12912A US1291225A US1676668A US 1676668 A US1676668 A US 1676668A US 12912 A US12912 A US 12912A US 1291225 A US1291225 A US 1291225A US 1676668 A US1676668 A US 1676668A
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United States
Prior art keywords
coil
telephone
telephone transmitter
resistance
electromagnet
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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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US12912A
Inventor
Round Henry Joseph
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RCA Corp
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RCA Corp
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Filing date
Publication date
Application filed by RCA Corp filed Critical RCA Corp
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Publication of US1676668A publication Critical patent/US1676668A/en
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Classifications

    • 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
    • H04R9/04Construction, mounting, or centering of coil
    • H04R9/046Construction
    • H04R9/047Construction in which the windings of the moving coil lay in the same plane

Definitions

  • I 'I his invention relates to. telephone transmitters of the magneto-phone type'ln Which the movements of a coil suspended 1n a mag- Anetic ield and moved by the incidence of sound Waves up ⁇ on it produce differences of potential' which are stepped up by ta trans'- formerand applied tothe grid of a thermionic valve by which they are ampliied.
  • the coily is constructed in the form of a spiral and is mounted upon an annular support formed ofl thin paper or other suitable material, the
  • the resistance 'f thecoil is chosen so that the damping resistance usually inserted in shunt across the secondary of the transformer may be omitted.
  • NI employ tissue 4paper and aluminium Wire.
  • this paper the spacf ing of the Wire, which4 is about No. 40,
  • Figures 2 -and 3 are respectively ia section and afront elevation of the telephone.-
  • Refe'rringto Figures 2 and 3, 1 is the telephone coil, 5 an'aznular paper support, and 6 and 7'are. the poles of a magneto-phone magnet or electromagnet. Having-described my invention What I v1.
  • an electromagnet having an annular air gap, a fiat aperiodic annular diaphragm supported therein, and a flat spiral coil secured tosaid diaphragm.
  • an electromagnet having a magnetic field, anf annular diaphragm suspended within the magnetic field;- ofsaid electromagnetya flat spiralA coil and .means for securing said coil to said diaphragm so that the Weight of said Vdiaphragr'ri and said se'-l curing means is approximately equal to lthe Weight ofsaid coil.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Audible-Bandwidth Dynamoelectric Transducers Other Than Pickups (AREA)

Description

TELEPHONE TmmswilTTERA Filed March 5, 1925 Side af INVENTO'R H. J. RQUND JUNITED STAT-Es n EN FICE.
'HENRY`JOSIPH\RUND, 0F LONDON, ENGLAND, A SSIGNOR TO RADIO CORPORATIGN OF AMERICA, A CORDORATION OF DELAW'AREI.l v
TELEPHONE TRANSMITTER.
Application 1aed March 3, 1925, serial No'.
I 'I his invention relates to. telephone transmitters of the magneto-phone type'ln Which the movements of a coil suspended 1n a mag- Anetic ield and moved by the incidence of sound Waves up`on it produce differences of potential' which are stepped up by ta trans'- formerand applied tothe grid of a thermionic valve by which they are ampliied.
According to this invention the coily is constructed in the form of a spiral and is mounted upon an annular support formed ofl thin paper or other suitable material, the
' Weight of' the wire being equal -or substany impaired unless the paper b e heavier andA tially equal to the Weightof the support and of the adhesive by which Ithe Wire is secured to the support. f l
The resistance 'f thecoil is chosen so that the damping resistance usually inserted in shunt across the secondary of the transformer may be omitted. e
Preferably NI employ tissue 4paper and aluminium Wire. With this paper the spacf ing of the Wire, which4 is about No. 40,
S. W. G., should not exceed 2 mm.; other stiffer. Such an arrangement Will not'be so sensitive.
It 1s usual to glve to speech transformer a natural resonance of about 1000 cyclesper second and by shunting the secondary with a resistance of about 250,000 ohmsfairly uniform, response lfor.
the range from 100 to 5 000 cycles can beobtained. But With any particular-transformer the exact value ofthe shunt resistance to obtain the required response curve may be determined experimentally.
-the Secondary of 'a' 12,912, and in Great isritain Maren 3, 1924..
coil connected to the primary coil equivalent al resistance in shuntto the secondary will be required so that the maximum voltage may be obtained Whilst the resonance curve remains Hat.
The invention is illustrated in the accompanyino drawing, of which Figure lis adiagram .showing the coil l of the telephone connected tothe primary "2 of a step-up transformer Whose secondary 3 is connected` to the grid of a thermionic valve 4. y
Figures 2 -and 3 are respectively ia section and afront elevation of the telephone.-
Refe'rringto Figures 2 and 3, 1 is the telephone coil, 5 an'aznular paper support, and 6 and 7'are. the poles of a magneto-phone magnet or electromagnet. Having-described my invention What I v1. In a telephone apparatus of the magneto-phone type, an electromagnet having an annular air gap, a fiat aperiodic annular diaphragm supported therein, and a flat spiral coil secured tosaid diaphragm.
I 2. Ina telephone apparatus of the magneto-phone type, an electromagnet having a magnetic field, anf annular diaphragm suspended within the magnetic field;- ofsaid electromagnetya flat spiralA coil and .means for securing said coil to said diaphragm so that the Weight of said Vdiaphragr'ri and said se'-l curing means is approximately equal to lthe Weight ofsaid coil. "i I l [3.' Ina telephonel apparatus of the magneto-phone vtype,l an electromagnet having a'magn'etic field, a flat annular paper iia phragm suspended Within the magnetic field 'of said electromagnet, a flatspiral aluminum Wire coil the spacing ofsaid Wiremot exceeding 2 mm; and means for` securing said coil to saddiaphragm. By making the resistance of thel telephone HENRY JOSEPH ROUND.
US12912A 1924-03-03 1925-03-03 Telephone transmitter Expired - Lifetime US1676668A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1676668X 1924-03-03

Publications (1)

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US1676668A true US1676668A (en) 1928-07-10

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US12912A Expired - Lifetime US1676668A (en) 1924-03-03 1925-03-03 Telephone transmitter

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922849A (en) * 1955-12-19 1960-01-26 Fukuin Denki Kabushiki Kaisha Compound electric speaker
US3141071A (en) * 1960-07-18 1964-07-14 Rosen Alfred H Full range electroacoustic transducers
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2922849A (en) * 1955-12-19 1960-01-26 Fukuin Denki Kabushiki Kaisha Compound electric speaker
US3164686A (en) * 1959-09-21 1965-01-05 Tibbetts Industries Electrodynamic transducer
US3141071A (en) * 1960-07-18 1964-07-14 Rosen Alfred H Full range electroacoustic transducers

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