GB518442A - Electro-mechanical vibration translating systems - Google Patents

Electro-mechanical vibration translating systems

Info

Publication number
GB518442A
GB518442A GB28295/38A GB2829538A GB518442A GB 518442 A GB518442 A GB 518442A GB 28295/38 A GB28295/38 A GB 28295/38A GB 2829538 A GB2829538 A GB 2829538A GB 518442 A GB518442 A GB 518442A
Authority
GB
United Kingdom
Prior art keywords
coil
driving
driven
fed
pole piece
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
GB28295/38A
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
Application filed by Electrical Research Products Inc filed Critical Electrical Research Products Inc
Publication of GB518442A publication Critical patent/GB518442A/en
Expired legal-status Critical Current

Links

Classifications

    • AHUMAN NECESSITIES
    • A01AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01MCATCHING, TRAPPING OR SCARING OF ANIMALS; APPARATUS FOR THE DESTRUCTION OF NOXIOUS ANIMALS OR NOXIOUS PLANTS
    • A01M23/00Traps for animals
    • A01M23/02Collecting-traps
    • A01M23/04Collecting-traps with tipping platforms
    • HELECTRICITY
    • H03ELECTRONIC CIRCUITRY
    • H03FAMPLIFIERS
    • H03F1/00Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
    • H03F1/34Negative-feedback-circuit arrangements with or without positive feedback
    • H03F1/36Negative-feedback-circuit arrangements with or without positive feedback in discharge-tube amplifiers
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04RLOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R3/00Circuits for transducers, loudspeakers or microphones
    • H04R3/002Damping circuit arrangements for transducers, e.g. motional feedback circuits
    • 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
    • H04R9/00Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R9/16Gramophone pick-ups using a stylus; Recorders using a stylus signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Signal Processing (AREA)
  • Acoustics & Sound (AREA)
  • Pest Control & Pesticides (AREA)
  • Insects & Arthropods (AREA)
  • Power Engineering (AREA)
  • Environmental Sciences (AREA)
  • Zoology (AREA)
  • Wood Science & Technology (AREA)
  • Soundproofing, Sound Blocking, And Sound Damping (AREA)
  • Apparatuses For Generation Of Mechanical Vibrations (AREA)
  • Amplifiers (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)

Abstract

518,442. Electro-acoustic apparatus; thermionic amplifiers. ELECTRICAL RESEARCH PRODUCTS Inc. Sept. 29, 1938, No. 28295. Convention date, Oct. 7, 1937. [Class 40 (iv)] [Also in Group XL] In an electro-mechanical vibration-translation system, e.g., for recording sound, having a magnetic circuit defining two spaced air gaps 14, 18 and a vibrating assembly comprising a resiliently-mounted member 20 supporting a driving coil 15 in one gap and a driven coil 19 in the other gap, the electrical energy generated by the vibration of the driven coil is fed back to the driving coil in phase opposition to the driving energy and the mass and stiffness of the vibrating assembly are so proportioned that it has a single resonant frequency in the range of frequency over which the system is intended to operate. The gaps are formed by an annular pole piece 13 and a centre pole piece 12 and by a spaced pole piece 16 and an extension 17 secured to the centre pole piece. A shield between the driving and driven coils is provided by rings 26, 27 of copper, and a fixed coil 29 located adjacent to coil 19 is connected in opposition to neutralize current induced in the coil 19 by the field of the driving coil. The coil-supporting member 20 is conical and is resiliently mounted on a diaphragm 24 and supported at its lower end by a V-shaped cantilever spring 23 secured to the pole piece 16. The diaphragm 24, which has a corrugation 25, and the conical member 20 are formed with perforations 28 to prevent the generation of additional resonances. The driving and driven coils may be mounted on a former having cylindrical portions joined by a frusto-conical portion, Fig. 5 (not shown). In a modification, Fig. 6, the upper portion of the former is cylindrical and tapers to a flat portion 70 carrying the driven coil 71 with its plane at right-angles to that of the coil 15. As shown in Fig. 3, the output from the driven coil 19 is fed over a loop 40, 41 and a phase-changing network 42 to the control grid of a valve 32, the output from the microphone 30 and amplifier 31 being fed to the suppressor grid 38 of the valve 32. In addition the amplifier employs negative feed back, and voltage from the output transformer 51 is fed through a phase changing network 45, 46 and a condenser 47 to the grid 44 of a valve 33. A condenser 48 and resistance 49 are also incorporated to minimize feed back at high frequencies. In a modified circuit arrangement, Fig. 8 (not shown), the feed back energy from the driven coil is supplied through a phase-shifting device to the control grid of a pentode valve, the driving energy from the microphone amplifier being applied to the suppressor grid of the valve. In a further modification, Fig. 9, the feed-back impulses from the driven coil 109 of the recorder are fed through a phase-shifting device 120 to a transformer 139 and to the grids 140, 141 of valves 131, 132 in push-pull. The signals to be recorded are fed from the microphone 101 to the driving coil 106 through amplifiers 133, 134 and the valves 131, 132.
GB28295/38A 1937-10-07 1938-09-29 Electro-mechanical vibration translating systems Expired GB518442A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US167708A US2161489A (en) 1937-10-07 1937-10-07 Vibratory system

Publications (1)

Publication Number Publication Date
GB518442A true GB518442A (en) 1940-02-27

Family

ID=22608481

Family Applications (1)

Application Number Title Priority Date Filing Date
GB28295/38A Expired GB518442A (en) 1937-10-07 1938-09-29 Electro-mechanical vibration translating systems

Country Status (5)

Country Link
US (1) US2161489A (en)
DE (1) DE868076C (en)
FR (1) FR844068A (en)
GB (1) GB518442A (en)
NL (1) NL61306C (en)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE457138A (en) * 1943-07-09
US2508783A (en) * 1945-02-16 1950-05-23 Lionel B Cornwell Electrical sound translating device
US2475200A (en) * 1945-06-28 1949-07-05 Rca Corp Signal recording apparatus
US2522567A (en) * 1946-06-21 1950-09-19 Emory G Cook Amplifier feed-back system for magnetic motors
NL75135C (en) * 1947-01-11
US2531242A (en) * 1947-09-05 1950-11-21 Bell Telephone Labor Inc Electrodynamic phonograph pickup
US2622156A (en) * 1949-01-27 1952-12-16 Donald J Baker Pickup head with removable armature and stylus assembly
US2858375A (en) * 1955-10-11 1958-10-28 Rca Corp Wide range dynamic phonograph pickup
US3020361A (en) * 1956-01-23 1962-02-06 Jerry B Minter Electromagnetic engraving apparatus
DE1031536B (en) * 1956-03-16 1958-06-04 Teldec Telefunken Decca Mechanical-electrical converter for the generation or scanning of a grooved sound track
BE555963A (en) * 1956-03-20
DE1121826B (en) * 1960-02-02 1962-01-11 Telefunken Gmbh Mechanical-electrical converter for the generation or scanning of a grooved sound track

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE357316C (en) * 1922-08-22 Horace Owen Merriman Apparatus for recording sounds
GB160223A (en) * 1919-11-18 1921-03-18 Adrian Francis Sykes Improvements in telephonic and like apparatus
US1535538A (en) * 1923-01-03 1925-04-28 Western Electric Co Vibratory system
US1645582A (en) * 1924-11-20 1927-10-18 Studebaker Corp Top construction
GB350998A (en) * 1930-03-10 1931-06-10 Alan Dower Blumlein Improvements in apparatus for recording sounds upon wax or other like discs or blanks

Also Published As

Publication number Publication date
US2161489A (en) 1939-06-06
NL61306C (en)
DE868076C (en) 1953-02-23
FR844068A (en) 1939-07-18

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