US3851117A - Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like - Google Patents

Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like Download PDF

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Publication number
US3851117A
US3851117A US00352189A US35218973A US3851117A US 3851117 A US3851117 A US 3851117A US 00352189 A US00352189 A US 00352189A US 35218973 A US35218973 A US 35218973A US 3851117 A US3851117 A US 3851117A
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US
United States
Prior art keywords
housing
sound pickup
switch
mounting means
electromagnetic sound
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 - Lifetime
Application number
US00352189A
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English (en)
Inventor
H Kuhn
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ELAC Electroacustic GmbH
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ELAC Electroacustic GmbH
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Filing date
Publication date
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    • 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
    • H04R11/12—Gramophone pick-ups using a stylus; Recorders using a stylus signals being recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Definitions

  • An electromagnetic sound pickup for use in the production of quadrophonic sound recordings and the like includes at least two scanning devices each suited for different frequency ranges.
  • Each scanning device is arranged on a common mounting means which is rotatably supported about its longitudinal axis in a sound pickup housing in such a manner that the pole piece ends associated with each scanning device can selectively be brought into contact with pole piece parts which are fixed with respect to the housing by rotating the mounting means about its longitudinal axis.
  • This invention relates to an electromagnetic sound pick-up, preferably for the reproduction of quadrophonic sound recordings, in which there are provided pole pieces each consisting of two separate parts.
  • One of the parts, which carries induction coils, is attached in fixed relation in a sound pickup housing, and the other pole piece part or pole piece end is detachably assembled to the pole piece part which is fixed to the pickup housing.
  • a magnetic armature which is firmly connected with a needle carrier, the latter being supported so that it can be elastically deflected.
  • the armature, armature bearing, and the needle carrier are combined to define a structural unit forming a scanning device.
  • the audiofrequency voltages of each of two of the four channels are combined according to a matrix method, known per se, for the purpose of transmission over only two channels.
  • the audio-frequency voltages of two channels are additionally modulated, after encoding, onto an auxiliary carrier situated above the audio-frequency range.
  • pickup devices which have different mechanical properties and which are specially suited for different frequency ranges are required for the scanning of the records.
  • at least two such scanning devices each suited for the different frequency ranges wherein the scanning devices, together with the pole piece ends associated with them, are arranged on a common mounting means which is rotatably supported about its longitudinal axis in the sound pickup housing in such a manner that, by rotating the mounting means, thepole piece ends associated with the scanning devices can selectably be brought in contact with the pole piece parts that are fixed with respect to the housing.
  • each of the two induction coils have a tap to which an operator switches when going to the quadrophonic method with auxiliary carrier.
  • the switch for switching from the one end of the coils to the taps (or vice versa) is coupled with the rotatably supported mounting means. In this manner assurance is always provided that the inductance matched to the frequency range to be scanned is switched into the circuit.
  • FIG. I is longitudinal cross sectional view taken along the line A-B in FIG. 2 and showing an electro-- magnetic sound pickup system according to one embodiment of the invention.
  • FIG. 2 is a view of the sound pickup system looking along the line C-D in FIG. ll.
  • FIG. 3 is a view of the switching plate for switching the inductance values of the induction coils as used in mature of a mass as small as possible is, therefore, re-
  • FIG. 1 there is shown one of two pole piece parts 2 which are fixed with respect to a pickup housing.
  • FIG. 1 also shows the associated induction coil 3 which is also disposed inside the pickup housing 1 along with the pole piece part 2.
  • the induction coil 3 is provided with a tap (not shown in FIG. 1) which, together with the one end of the coil winding, is led to contacts 13 and 14 which are arranged outside the housing 1.
  • a mounting means 4 is supported for rotation about its longitudinal axis on the housing 1.
  • the mounting means 4 mounts scanning devices 5, 6, 7 (see also FIG. 2) suitable for scanning different frequency ranges with their associated pole piece ends 8, 9, 10 (see also FIG. 1).
  • the scanning devices are displaced by 120 relative to each other.
  • a shaft 11 for the mounting means 4 extends through the pickup housing 1 and carries a switch plate 12 on its backside.
  • This switch plate 12 is provided on both sides with conductor tracks, as can be seen in detail in FIG. 3, and is arranged so that the conductors on one side are contacted by the contacts 13 and 14 and the conductors on the other side by contact pins 17 and 18 of the pickup.
  • the contact pins 17 and 18 of the pickup are arranged in a receptacle 16 which is rigidly connected to the pickup housing 1.
  • a knob 20 is provided for rotating the mounting means 4.
  • a detent spring 21 is provided which has one end fastened to the receptacle 16 (FIG. 1) and which carries at its free end a conical pin 22. When switching from one scanning device to another, the detent spring 21 snaps with this pin 22 into corresponding recesses 23, 24 25, which are provided in the mounting means 4.
  • the switch plate 12 is switched to the inductance values of the induction coils which correspond to this frequency range.
  • FIG. 3 shows conductor tracks 26 and 27 arranged on the switch plate 12 with their switch contacts 28, 29, 30 and 31, 32 33, respectively. Also shown in FIG. 3 is a second induction coil 34 having a tap leading to a contact 35 and also having one end which leads to a contact 36. The other end of the coil 34 is connected with the one end of the induction coil 3 via a wire 15, and the latter is connected to the pickup contact pin 19. The other end of the coil 3 leads to the contact 13 and its tap to the contact 14. I.
  • the conductor track 26 For switching to the appropriate inductance values of the induction coil 3, the conductor track 26, on the one hand, is associated with the pickup contact pin 17 which slides continuously on the conductor track 26 and, on the other hand, makes connection with the contacts 13 or 14 of the coil 3 via the switch contacts 28, 29 or 30, depending on the position of the switch plate 12.
  • the pickup contact pin 18 slides continuously on the conductor tract 27, and, on the other hand, makes connection with the contacts 35 or 36 of the coil 34 via the switch contacts 31, 32 or 33 depending on the position of the switch plate 12.
  • An electromagnetic sound pickup for use in the production of quadrophonic sound recordings and the like comprising a housing, pole pieces each having two parts, one of said parts carrying an induction coil and being fixedly mounted on said housing, the other of said parts being detachably assembled to said one part which is fixed to said housing, a magnetic armature associated with each detachably assembled part of said pole pieces, a needle carrier connected to each said magnetic armature, said needle carrier being supported so that it can be elastically deflected, each said magnetic armature and connected needle carrier defining a structural unit forming a scanning device, at least two scanning devices, each suited for different frequency ranges, a common mounting means rotatably mounted on said housing, each of said scanning devices together with its associated part of said pole pieces being mounted on said mounting means, whereby rotation of said mounting means causes each said other part of said pole pieces to selectively be brought into contact with the one part of said pole piece that is fixed to said housmg.
  • An electromagnetic sound pickup according to claim 1 including means for changing the inductance of said induction coils.
  • each of said induction coils is provided with at least one tap, each of said coils having an end, a switch means for switching between said tap and the respective coil end, said switch being coupled for rotation with said mounting means.
  • switch means includes a switch plate having conductor tracks, and pickup contact means in continuous sliding contact with said conductor tracks.

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electrophonic Musical Instruments (AREA)
  • Moving Of Heads (AREA)
  • Electromagnets (AREA)
US00352189A 1972-06-21 1973-04-18 Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like Expired - Lifetime US3851117A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2230203A DE2230203C2 (de) 1972-06-21 1972-06-21 Elektromagnetischer Tonabnehmer, vorzugsweise zur Wiedergabe von quadrofonischen Schallaufnahmen

Publications (1)

Publication Number Publication Date
US3851117A true US3851117A (en) 1974-11-26

Family

ID=5848305

Family Applications (1)

Application Number Title Priority Date Filing Date
US00352189A Expired - Lifetime US3851117A (en) 1972-06-21 1973-04-18 Electromagnetic sound pickup for the reproduction of quadrophonic sound recordings and the like

Country Status (3)

Country Link
US (1) US3851117A (fr)
JP (1) JPS5117886B2 (fr)
DE (1) DE2230203C2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364120A (en) * 1978-10-06 1982-12-14 Kabushiki Kaisha Audio-Technica Pickup cartridge of moving coil type for phonograph

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401237A (en) * 1962-08-27 1968-09-10 Victor Company Of Japan Simultaneous recording of two signals per channel
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3700829A (en) * 1969-03-25 1972-10-24 Fonofilm Ind As Magnetic stereophonic phonograph pickup
US3720796A (en) * 1967-06-20 1973-03-13 Audio Technica Kk Multichannel pickup cartridge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3401237A (en) * 1962-08-27 1968-09-10 Victor Company Of Japan Simultaneous recording of two signals per channel
US3720796A (en) * 1967-06-20 1973-03-13 Audio Technica Kk Multichannel pickup cartridge
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3700829A (en) * 1969-03-25 1972-10-24 Fonofilm Ind As Magnetic stereophonic phonograph pickup

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4364120A (en) * 1978-10-06 1982-12-14 Kabushiki Kaisha Audio-Technica Pickup cartridge of moving coil type for phonograph

Also Published As

Publication number Publication date
JPS4953003A (fr) 1974-05-23
JPS5117886B2 (fr) 1976-06-05
DE2230203C2 (de) 1974-07-04
DE2230203A1 (fr) 1973-12-13
DE2230203B1 (de) 1973-12-13

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