GB334551A - Improvements relating to electro-magnetic gramophone pick-ups or recorders - Google Patents

Improvements relating to electro-magnetic gramophone pick-ups or recorders

Info

Publication number
GB334551A
GB334551A GB1727729A GB1727729A GB334551A GB 334551 A GB334551 A GB 334551A GB 1727729 A GB1727729 A GB 1727729A GB 1727729 A GB1727729 A GB 1727729A GB 334551 A GB334551 A GB 334551A
Authority
GB
United Kingdom
Prior art keywords
needle
magnet
pole
magnetic
branches
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
GB1727729A
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.)
British Thomson Houston Co Ltd
Original Assignee
British Thomson Houston 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 British Thomson Houston Co Ltd filed Critical British Thomson Houston Co Ltd
Priority to GB1727729A priority Critical patent/GB334551A/en
Priority to FR696665D priority patent/FR696665A/en
Publication of GB334551A publication Critical patent/GB334551A/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)
  • Optical Recording Or Reproduction (AREA)

Abstract

334,551. British Thomson-Houston Co., Ltd., and Bowen, A. June 5, 1929. Magnetic instruments; phonographic recorders and reproducers. - In a gramophone pick-up or recorder of the kind having a perma.- nent or electromagnet and a coil or coils linked with a magnetic flux, the needle or stylus being of ferromagnetic material and producing, by its vibrations, variations in the magnetic flux path, the needle 7 forms an extension of one pole 13 of the magnet 1. The other pole of the magnet has a soft iron pole piece 2 divided into two converging branches 3, 4 on which are arranged coils 5, 6 connected in series. The needle is adapted to vibrate in the gap between the branches 3, 4. This vibration does not involve any substantial variation in the total flux through the magnet and needle, which are of high reluctance, but it varies the distribution of the flux through the low reluctance branches 3, 4, thereby inducing current changes in the coils 5, 6. A light stylus holder 8 of ferromagnetic material is pivoted to the pole 13 of the magnet through ferromagnetic brackets 10, 11, with the interposition of rubber strips 12 for damping purposes. Specification 276,466 is referred to.
GB1727729A 1929-06-05 1929-06-05 Improvements relating to electro-magnetic gramophone pick-ups or recorders Expired GB334551A (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
GB1727729A GB334551A (en) 1929-06-05 1929-06-05 Improvements relating to electro-magnetic gramophone pick-ups or recorders
FR696665D FR696665A (en) 1929-06-05 1930-06-05 Improvements in electro-magnetic devices intended for the recording or reproduction of phonograms

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1727729A GB334551A (en) 1929-06-05 1929-06-05 Improvements relating to electro-magnetic gramophone pick-ups or recorders

Publications (1)

Publication Number Publication Date
GB334551A true GB334551A (en) 1930-09-05

Family

ID=10092377

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1727729A Expired GB334551A (en) 1929-06-05 1929-06-05 Improvements relating to electro-magnetic gramophone pick-ups or recorders

Country Status (2)

Country Link
FR (1) FR696665A (en)
GB (1) GB334551A (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2483196A (en) * 1947-04-11 1949-09-27 Bendix Aviat Corp Phono-pickup
US2501233A (en) * 1945-03-14 1950-03-21 Decca Record Co Ltd Phonograph pickup having permanent magnet armature
US3031536A (en) * 1957-11-27 1962-04-24 Pickering & Co Inc Multiple coil electromagnetic sound reproducer
US3088000A (en) * 1958-02-27 1963-04-30 Gen Electric Phonograph cartridge and stylus
US3118978A (en) * 1958-02-27 1964-01-21 Gen Electric Magnetic stereophonic phonograph cartridge
US3463889A (en) * 1957-10-30 1969-08-26 Shure Bros Moving magnet stereophonic pickup

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2501233A (en) * 1945-03-14 1950-03-21 Decca Record Co Ltd Phonograph pickup having permanent magnet armature
US2483196A (en) * 1947-04-11 1949-09-27 Bendix Aviat Corp Phono-pickup
US3463889A (en) * 1957-10-30 1969-08-26 Shure Bros Moving magnet stereophonic pickup
US3031536A (en) * 1957-11-27 1962-04-24 Pickering & Co Inc Multiple coil electromagnetic sound reproducer
US3088000A (en) * 1958-02-27 1963-04-30 Gen Electric Phonograph cartridge and stylus
US3118978A (en) * 1958-02-27 1964-01-21 Gen Electric Magnetic stereophonic phonograph cartridge

Also Published As

Publication number Publication date
FR696665A (en) 1931-01-06

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