GB285454A - Sound recording and reproducing apparatus - Google Patents

Sound recording and reproducing apparatus

Info

Publication number
GB285454A
GB285454A GB1348/28A GB134828A GB285454A GB 285454 A GB285454 A GB 285454A GB 1348/28 A GB1348/28 A GB 1348/28A GB 134828 A GB134828 A GB 134828A GB 285454 A GB285454 A GB 285454A
Authority
GB
United Kingdom
Prior art keywords
conductor
rubber
conductors
magnet
construction
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
GB1348/28A
Original Assignee
Henry Hallam
Joseph Rolland Marie Helary
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 FR629363T priority Critical
Application filed by Henry Hallam, Joseph Rolland Marie Helary filed Critical Henry Hallam
Publication of GB285454A publication Critical patent/GB285454A/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
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12Gramophone pick-ups using a stylus; Recorders using a stylus
    • 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

285,454. Hallam, H., and Helary, J. R. M. Feb. 17, 1927, [Convention date]. Magnetic instruments; diaphragms; phonographic recorders and reproducers.-A sound recording and reproducing device, more particularly for use in connection with gramophones, comprises the combination of a conductor formed by a non-coiled wire or blade adapted to move perpendicularly to the lines of force of a magnetic field, and means, such as elastic or deformable material, for guiding the conductor over the whole of the portion thereof situated between the magnetic poles so as to prevent any parasitic vibrations of the conductor or any movement thereof which is not strictly perpendicular to the lines of force of the magnetic field. Fig. 2 shows a construction in which a conductor 9, situated in the gap between the poles of a magnet 8, carries at one end a stylus holder 10, whilst its other end is connected to a pivot pin 11 mounted in rubber bearings 12, 13. A screw 14 acting on the bearing 13 regulates the pressure on the pin 11. The conductor 9 is prevented from being displaced in the direction of the lines of force by damping pads 15 of rubber, the width of the air gap and the pressure of the pads on the conductor being adjustable by means of a stirrup 16 and screw 17. The circuit leads 24, 25 are arranged one on each side of the air gap. In a modified construction, Fig. 3, the conductor 9a is made longer and formed with an enlarged portion 18 embedded in a rubber block 19. Rubber bosses 20 situated on either side of the conductor may be provided on the magnet limbs as shown, or may be located at several points or over the whole length of the limbs. In a further modification, Fig. 6, the magnet 23 is enclosed in a two-part box 22, rubber pads 21 fixed to the two portions of the box being adapted to bear on the edges of the conductor. In order to avoid eddy currents, the conductor is preferably built up of laminµ 26. Fig. 8, connected at their ends by conductors 27, 28. The Specification as open to inspection under Sect. 91 (3) (a) comprises also a construction of microphone or loud-speaker, Fig. 9 (Cancelled), in which a diaphragm 33 of light fabric or rubber having one or more conductors 34 embedded therein is supported on arms 31 fixed to the outer faces of the limbs of the magnet 30. The ends of the conductors 34 are connected by conductors 35, as shown in Fig. 10 (Cancelled). According to a further construction, a number of sets of conductors are incorporated in a single diaphragm each set co-operating with an independent magnet A horn may be provided in front of the diaphragm. This subject-matter does not appear in the Specification as accepted.
GB1348/28A 1927-02-17 1928-01-14 Sound recording and reproducing apparatus Expired GB285454A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR629363T 1927-02-17

Publications (1)

Publication Number Publication Date
GB285454A true GB285454A (en) 1929-02-21

Family

ID=8990308

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1348/28A Expired GB285454A (en) 1927-02-17 1928-01-14 Sound recording and reproducing apparatus

Country Status (2)

Country Link
FR (1) FR629363A (en)
GB (1) GB285454A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422817A (en) * 1945-03-12 1947-06-24 Donald J Baker Pickup head
US3038037A (en) * 1958-01-29 1962-06-05 Mc Graw Edison Co Recording machine

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588327A (en) * 1948-01-31 1952-03-04 Dictaphone Corp Recorder head

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2422817A (en) * 1945-03-12 1947-06-24 Donald J Baker Pickup head
US3038037A (en) * 1958-01-29 1962-06-05 Mc Graw Edison Co Recording machine

Also Published As

Publication number Publication date
FR629363A (en) 1927-11-09

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