GB340219A - Improvements in electromagnetic devices for reproducing or recording sound - Google Patents

Improvements in electromagnetic devices for reproducing or recording sound

Info

Publication number
GB340219A
GB340219A GB28605/29A GB2860529A GB340219A GB 340219 A GB340219 A GB 340219A GB 28605/29 A GB28605/29 A GB 28605/29A GB 2860529 A GB2860529 A GB 2860529A GB 340219 A GB340219 A GB 340219A
Authority
GB
United Kingdom
Prior art keywords
pole pieces
diaphragm
armature
casing
class
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
GB28605/29A
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.)
Electrical Research Products Inc
Original Assignee
Electrical Research Products Inc
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 US326941A priority Critical patent/US1816906A/en
Application filed by Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB340219A publication Critical patent/GB340219A/en
Expired legal-status Critical Current

Links

Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00Details of transducers, loudspeakers or microphones
    • H04R1/16Mounting or connecting stylus to transducer with or without damping means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R11/00Transducers of moving-armature or moving-core type
    • H04R11/08Gramophone pick-ups using a stylus; Recorders using a stylus

Abstract

340,219. Phonographic recorders and reproducers. ELECTRICAL RESEARCH PRODUCTS, Inc., 195, Broadway, New York, U.S.A.-(Assignees of Jones, W. C. ; 262, State Street, Flushing, New York, U.S.A.) Sept. 20, 1929, No. 28605. Convention date, Dec. 19, 1928. [Class 40 (iv).] An electromagnetic vibration translating device, such as a sound reproducer or recorder, of the kind in which the casing is filled with a viscous damping material, comprises a four-gap magnetic structure and a diaphragm which forms a closure for the casing and serves as a pivot for the armature. As shown, a T-shaped armature 7 has its reed portion 1 protruding through the diaphragm 3 into the gap between pole pieces 6 of a magnet 11. The ends of the armature 7 are arranged to form gaps 8, 9 between further pole pieces 10 secured to the pieces 6. Coils 4 surround the pole pieces 10. The diaphragm does not form an essential part of the magnetic circuit, Fig. 5 showing the flux path when the device is at rest, and Fig. 6 the flux path when the device is used as a phonograph reproducer. A diameter of the diaphragm serves as the pivotal axis of the reed, this diameter being stiffened by a strip 5. The pole pieces 6, 10 are connected by a bridge piece 14, which is formed with apertures for engagement by a suitable tool for adjusting the position of the pole pieces. In a modification, a single coil surrounds the armature, and the pole pieces 10 are bent at right angles. Specifications 231,216 and 290,264, [both in Class 40 (iv), Telephones &c.], are referred to.
GB28605/29A 1928-12-19 1929-09-20 Improvements in electromagnetic devices for reproducing or recording sound Expired GB340219A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US326941A US1816906A (en) 1928-12-19 1928-12-19 Electromagnetic device

Publications (1)

Publication Number Publication Date
GB340219A true GB340219A (en) 1930-12-22

Family

ID=23274434

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28605/29A Expired GB340219A (en) 1928-12-19 1929-09-20 Improvements in electromagnetic devices for reproducing or recording sound

Country Status (4)

Country Link
US (1) US1816906A (en)
FR (1) FR683390A (en)
GB (1) GB340219A (en)
NL (1) NL29139C (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2508783A (en) * 1945-02-16 1950-05-23 Lionel B Cornwell Electrical sound translating device

Also Published As

Publication number Publication date
US1816906A (en) 1931-08-04
FR683390A (en) 1930-06-11
NL29139C (en)

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