GB262910A - Improvements in or relating to telephone transmitters and receivers - Google Patents

Improvements in or relating to telephone transmitters and receivers

Info

Publication number
GB262910A
GB262910A GB2943725A GB2943725A GB262910A GB 262910 A GB262910 A GB 262910A GB 2943725 A GB2943725 A GB 2943725A GB 2943725 A GB2943725 A GB 2943725A GB 262910 A GB262910 A GB 262910A
Authority
GB
United Kingdom
Prior art keywords
coil
magnetic pole
graham
diametrical
opposite
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
Application number
GB2943725A
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.)
Individual
Original Assignee
Individual
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
Application filed by Individual filed Critical Individual
Priority to GB2943725A priority Critical patent/GB262910A/en
Publication of GB262910A publication Critical patent/GB262910A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R7/00—Diaphragms for electromechanical transducers; Cones
    • H04R7/02—Diaphragms for electromechanical transducers; Cones characterised by the construction

Abstract

262,910. Graham, M., and Graham, A., (Representatives of Graham, E. A.), and Paddle, L. H. Nov. 21, 1925. Magnetic instruments.-In a transmitter or receiver of the electrodynamic type, a conducting coil 6 carried by a flexible diaphragm 7 is mounted in a magnetic field so that it vibrates in two lateral portions about a stationary diametrical portion, the two portions cutting the magnetic field. An outer magnetic pole is formed by a ring 5 seated in the open end of a pot electromagnet and having a step-shaped inner periphery, and an inner magnetic pole is formed by a removable end portion 2b of a central core 2 of the electromagnet. The upper part of the outer magnetic pole is recessed at opposite diametrical parts 5a, 5b to form two segmental polar tips 5<c>, 5d, and the inner magnetic pole has a lateral annular flange 2a, the coil being located in the space between the polar tips. The flexible diaphragm bears against the inner side of the segmental and annular polar tips and is supported by a rigid ring 8 having a diametrical rib, and two diametrically arranged radial strips 9, 9a bear against the coil opposite the rib. The parts are clamped between inner and outer plates 10, 11, the latter of which has openings 11<a> opposite the coil to admit sound waves. The radial strips are of hard material, such as fibre or metal, or of soft yielding or resilient material, such as rubber. The ends of the coil are connected to the input terminals of a thermionicvalve amplifying-apparatus, such as described in Specification 266,029, [Class 40 (v), Wireless signalling &c.], and a point of substantially balanced potential, for example the central point of a single layer coil or the junction point between two layers, is connected to the earthed pole of the current-supply system of the amplifying-apparatus.
GB2943725A 1925-11-21 1925-11-21 Improvements in or relating to telephone transmitters and receivers Expired GB262910A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2943725A GB262910A (en) 1925-11-21 1925-11-21 Improvements in or relating to telephone transmitters and receivers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2943725A GB262910A (en) 1925-11-21 1925-11-21 Improvements in or relating to telephone transmitters and receivers

Publications (1)

Publication Number Publication Date
GB262910A true GB262910A (en) 1926-12-23

Family

ID=10291537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2943725A Expired GB262910A (en) 1925-11-21 1925-11-21 Improvements in or relating to telephone transmitters and receivers

Country Status (1)

Country Link
GB (1) GB262910A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209084A (en) * 1961-02-20 1965-09-28 Gamzon Devorah Denise Electro-acoustical transducer
JPS5723394A (en) * 1972-06-20 1982-02-06 Beer Palle Finn Electroacoustic converter
EP4046765A1 (en) 2021-02-18 2022-08-24 Guitti, Marisa Concrete mixer and method for the preparation and handling of a concrete mixture by use thereof

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3209084A (en) * 1961-02-20 1965-09-28 Gamzon Devorah Denise Electro-acoustical transducer
JPS5723394A (en) * 1972-06-20 1982-02-06 Beer Palle Finn Electroacoustic converter
JPS609398B2 (en) * 1972-06-20 1985-03-09 パレ−フイン・ベ−ル electroacoustic transducer
EP4046765A1 (en) 2021-02-18 2022-08-24 Guitti, Marisa Concrete mixer and method for the preparation and handling of a concrete mixture by use thereof

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