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GB334691A - Improvements in electro-magnetic acoustic devices - Google Patents

Improvements in electro-magnetic acoustic devices

Info

Publication number
GB334691A
GB334691A GB25384/29A GB2538429A GB334691A GB 334691 A GB334691 A GB 334691A GB 25384/29 A GB25384/29 A GB 25384/29A GB 2538429 A GB2538429 A GB 2538429A GB 334691 A GB334691 A GB 334691A
Authority
GB
United Kingdom
Prior art keywords
coils
pole
magnetic material
wound
coil
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
GB25384/29A
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.)
Parlophone Records Ltd
Original Assignee
Gramophone Co Ltd
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 Gramophone Co Ltd filed Critical Gramophone Co Ltd
Priority to GB25384/29A priority Critical patent/GB334691A/en
Priority to US466670A priority patent/US1916703A/en
Publication of GB334691A publication Critical patent/GB334691A/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
    • H04R11/00—Transducers of moving-armature or moving-core type
    • H04R11/08—Gramophone pick-ups using a stylus; Recorders using a stylus

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Magnetic Treatment Devices (AREA)
  • Electrostatic, Electromagnetic, Magneto- Strictive, And Variable-Resistance Transducers (AREA)

Abstract

334,691. Gramophone Co., Ltd., White, J., and Payne, E. M. Aug. 20, 1929. Electromagnets.- An electromagnetic acoustic device comprising a magnetic core surrounded over part of its length by a coil of magnetic material, the cross-section of the core within the coil being reduced. In the gramophone pick-up shown in Fig. 1, a U-shaped permanent magnet 1 has a pole-piece 2 of U-shape. The pole-piece limbs are provided with slots leaving a narrow strip 3 and coils 4 of magnetic material are wound to fill the slots, and may project beyond the upper and lower faces of the pole pieces. Alternatively, the faces of the coils themselves may form pole surfaces (Fig. 3, not shown). The coils may be wound on bobbins wholly or partly of magnetic material, and may serve as magnetizing coils.
GB25384/29A 1929-08-20 1929-08-20 Improvements in electro-magnetic acoustic devices Expired GB334691A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB25384/29A GB334691A (en) 1929-08-20 1929-08-20 Improvements in electro-magnetic acoustic devices
US466670A US1916703A (en) 1929-08-20 1930-07-09 Electromagnetic acoustic device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB25384/29A GB334691A (en) 1929-08-20 1929-08-20 Improvements in electro-magnetic acoustic devices

Publications (1)

Publication Number Publication Date
GB334691A true GB334691A (en) 1930-09-11

Family

ID=10226792

Family Applications (1)

Application Number Title Priority Date Filing Date
GB25384/29A Expired GB334691A (en) 1929-08-20 1929-08-20 Improvements in electro-magnetic acoustic devices

Country Status (2)

Country Link
US (1) US1916703A (en)
GB (1) GB334691A (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2507708A (en) * 1945-12-22 1950-05-16 Pennsylvania Electronics Inc Phonograph pickup having permanent magnet armature
US2444336A (en) * 1946-01-30 1948-06-29 Lionel B Cornwell Electrical sound translating device

Also Published As

Publication number Publication date
US1916703A (en) 1933-07-04

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