US3576956A - Stereophonic phonograph transducer - Google Patents

Stereophonic phonograph transducer Download PDF

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Publication number
US3576956A
US3576956A US814556A US3576956DA US3576956A US 3576956 A US3576956 A US 3576956A US 814556 A US814556 A US 814556A US 3576956D A US3576956D A US 3576956DA US 3576956 A US3576956 A US 3576956A
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US
United States
Prior art keywords
body portion
longitudinally extending
extending portion
mutually perpendicular
magnet
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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
US814556A
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English (en)
Inventor
Cornelis Lanooy
Herbert Mensen
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US Philips Corp
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US Philips Corp
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Filing date
Publication date
Application filed by US Philips Corp filed Critical US Philips Corp
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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
    • H04R19/00—Electrostatic transducers
    • H04R19/06—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R19/10—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/16—Mounting or connecting stylus to transducer with or without damping means
    • 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

  • ABSTRACT A phonograph pickup, particularly for stereophonic recording and reproduction in which a body for converting movements of a stylus is suspended within a housing to be tiltable in all directions.
  • PATENTEUHAY 41911 31575956 sum 2 or 2 INVENTOR COBNELIS LANOOY HERBERT MENSEN AGENTS STEREOPHONIC PHONOGRAPH TRANSDUCER
  • the convening device according to the invention includes a body which follows the movement of the recording or scanning member and is tiltable in all directions between fixed parts of the device, which, together with the movable body, bring about the conversion. Consequently, such a system has two degrees of freedom for rotation and affords therefore several possibilities of application which could not be realized heretofore with known systems by means of a single body following the movement of the recording or scanning member.
  • the principle of the tiltability makes it possible for the recording or scanning member to transmit two vibrations of arbitrary directions, but at right angles or substantially at right angles to each other, either separately or in combination. It may in addition be necessary, after the directions of vibration have been determined, that the above-mentioned fixed parts shall be positioned with respect to the body following the movement of the recording or scanning member by rotation of these parts about the longitudinal axis of the system so that the maximum sensitivity of the converting device for the relevant direction or directions of vibration occurs.
  • a possibility of application of a device according to the invention consists in recording or scanning records either with depth modulation or lateral modulation, or in recording or scanning both kinds of modulation at the same time in a single groove, one direction of vibration then being at right angles to surface of the record carrier.
  • the last-mentioned case the
  • Such double information may consist of a monaural signal and an effect signal, for example a reverberation signal, or of two stereophonically associated signals.
  • an effect signal for example a reverberation signal
  • two stereophonically associated signals for example a reverberation signal
  • one direction of vibration is recorded or scanned at an angle to the surface of the record carrier differing from 90.
  • The. tiltability of the body following the movement of the member may be realized in different ways by either shaping the side of the body remote from the member in the form of a ball-joint, or joumaling it in a cardan suspension, or in a trunnionlike part of the device.
  • the tiltable body is located opposite at least one fixed part, arranged in conformity with said directions of vibration, of two circuits which act upon the body independently of each other in the two different directions of vibration.
  • at least one fixed part of two circuits, which are independent of each other is influenced by the two different directions of vibration of the body.
  • the circuits referred to above may be the path of flow for either an electric current or a magnetic flux.
  • the tiltable body may be provided with at least one metallic coating which constitutes one electrode of at least one capacitor, the other electrode of which is ananged on the fixed parts of the device coacting with the body.
  • the tiltable body may be a disclike body of magnetizable material having on its periphery four pole-pieces which constitute pairwise the extremities of two cross-positioned yokes provided with coils, while the permanent magnet feeding the said circuits comprising the yokes and the magnetizable disc is located in one plane of symmetry of the disc so that the axis of the magnet is directed towards the center of gravity of the disc.
  • the fiux passing through each pair of pole-pieces varies as a result of the tilting of the magnetizable disc, so that a separation of the double information is brought about by the said arrangement of the individual magnetic circuits around said common body.
  • the two different signals are combined into a double information in the groovelike record track.
  • the magnetizable disc in the shape of a per manent magnet which is common to the two circuits and magnetized in accordance with the centerline of the disc.
  • the permanent magnet may alternatively be of a different shape, for example spherical or cross-shaped.
  • those parts are omitted from the disc which have no pole-pieces opposite them and thus are unimportant for the transmission of the flux.
  • the portion of the device containing the fixed part of the ball-joint or of the trunnion bearing is preferably fixedly arranged between the limbs of the U-shaped yokes.
  • the member which permits the tilting movement is joined to the tiltable body, while that extremity of the holder for the recording or scanning member which is remote from this member may be urged against the first-mentioned member and/or the tiltable body.
  • a resilient element for example a compression spring, may be arranged between the extremity of the holder remote from the member and a fixed part of the device.
  • FIG. 1 shows diagrammatically a converting device according to the invention which is based upon the electrostatic principle and in which the holder of the member is journaled by means of a ball-joint;
  • FIG. 2 shows a similar converting device which is based upon the electromagnetic principle and in which the holder for the member is journaled in a cardan suspension;
  • FIG. 3 is a cross-sectional view of the device of FIG. 2, taken along the line "H";
  • FIG. 4 shows a similar converting device which is based upon the magnetodynamic principle and in which the holder for the member is journaled in a trunnionlike part, and
  • FIG. 5 is a perspective view of the converting device shown in FIG. 4.
  • this FIG. shows a converting device for recording or scanning a groovelike record track, in which a body 3 which follows the movement of a holder 1 for a recording and scanning member 2 is tiltable in all directions with respect to fixed parts 4 of the device which, together with the movable body, bring about the conversion.
  • the side of the body 3 remote from the member 2 is provided with a semispherical body 5 which can pivot in a cuplike part 6.
  • the tiltable body 3 is provided with a metal electrode 7 which opposes the fixed electrode 4, the electrodes 4 and 7 constituting a capacitor to which or from which the signal voltage is supplied or derived through an amplifier 8.
  • Such a system may be readily adapted to stereophony or similar purposes in which the simultaneous recording or scanning of double information is concerned, by adding to the system of a second circuit.
  • a converting device is thus obtained which is suitable for recording or scanning, by means of a common recording and scanning member, a groovelike record track in which two signals of relatively perpendicular or substantially perpendicular directions of vibration are recorded simultaneously.
  • the tiltable body is preferably located opposite at least one fixed part, arranged in conformity with said directions of vibration, of two circuits which may be influenced independently of each other by the two different directions of vibration of the body.
  • the member 1 thus fulfills the function of the member common to the two directions of vibration, of a device which retains its compatibility with respect to a single signal, since such a signal can always be disintegrated into components which coincide with the said two different directions of vibration.
  • the tiltable body 3 when use is made of the first-mentioned system, for recording or scanning double information, the tiltable body 3 has two electrodes 7, 9 each constituting together with the fixedly arranged electrodes 4, 10 respectively a capacitor to which or from which the two components of the double information are supplied or derived through amplifiers 8 and 11 respectively.
  • FIG. 2 shows a converting device which is based upon the electromagnetic principle and in which the holder 1 for the member 2 is suspended in two cardan rings Hand 13.
  • the tiltable body 3 comprises a disclike body of magnetirable material having on its periphery four pole-pieces 14, 16 and 15, 17 (see also FIG. 3) which constitute pairwise the extremities of two cross-positioned yokes 20 and 21 provided with coils 18, 19 while a permanent magnet 22 feeding the said circuits constituted by the yokes 20, 21 and the magnetizable body 3 is located in one plane of symmetry of the disc so that the axis of the magnet is directed towards the center of gravity of the disc 3.
  • the disc 3 rotates about two spindles 23 which diametrically join the disc 3 to the cardan ring 12, which, in its turn, is joined to cardan ring 13 through two spindles 29 located diametrically and in 90 shifted positions with respect to the spindles 23.
  • the cardan ring 12 it is also possible for the cardan ring 12 to be connected through the spindles 29 to part of the casing 24 of the device.
  • FIG. 4 shows a converting device which is based upon the magnetodynamic principle and in which the holder 1 for the member 2 is joumaled in a trunnionlike part 25.
  • the tiltable, magnetizable disc 3 constitutes the permanent magnet common to the two circuits, which is magnetized in accordance with the centerline of the disc.
  • the disc 3 comprises a ring which is located to be tiltable between two pairs of pole pieces 14, 16 and 15, 17 respectively (see also FIG. 5) which constitute the extremities of two cross-positioned U-shaped yokes 20 and 21 provided with coils 18, 19 respectively.
  • the holder 1 is provided with a collar 26 having an upright edge 27 which fits into the annular space of the permanent magnet 3 and is joined thereto.
  • the holder 1 is urged against the stationary part of the journaling bodies, as shown in FIGS. 1 and 4, by means of a resilient element, for example a rubber ring or a compression spring 28, which is arranged freely around the holder 1 and enclosed between the inner wall of the casing 24 of the device and the collar 26 of the holder 1.
  • a resilient element for example a rubber ring or a compression spring 28 which is arranged freely around the holder 1 and enclosed between the inner wall of the casing 24 of the device and the collar 26 of the holder 1.
  • An electrical transducer comprising a stylus holder member having a longitudinally extending portion, a body portion at one end of said longitudinally extending portion, said body portion extending in two mutually perpendicular directions substantially perpendicular to the longitudinal axis of said longitudinally extending portion and having a spherical outer surface, socket means engaging said outer surface, said longitudinally extending portion being rotatable about two mutually perpendicular axes passing through the center of said spherical surface, and means comprising saidbody portion and fixed means cooperating therewith for generating two electrical signals each indicative of the degree of rotation of said longitudinally extending portion about a given respective one of said axes.
  • said signal-generating means comprises a first electrostatic electrode system secured to said body portion at a point along one of said mutually perpendicular directions and a second electrostatic electrode system secured to said body portion at a point along the other of said mutually perpendicular directions.
  • An electrical transducer comprising a stylus holder member having a longitudinally extending portion, a body portion at one end of said longitudinally extending portion and extending in two mutually perpendicular directions substantially perpendicular to the lon itudinal axis of said longitudina ly extending portions, sai body portion comprising an annular permanent magnet having opposing magnetic poles at opposite end faces thereof, said longitudinally extending portion being rotatable about two mutually perpendicular axes passing through said body portion, a first magnetic yoke member having two arm portions extending toward said magnet and having pole pieces arranged in confronting relationship to the periphery of said magnet at diametrically opposite edge portions thereof, a second magnetic yoke member having two arm portions extending toward said magnet and having pole pieces arranged in confronting relationship to the periphery of said magnet spaced in quadrature position with respect to said first pole-pieces, and electrical signal coils arranged on said yoke members.
  • An electrical transducer as claimed in claim 3 further comprising a frame member, a trunnion support member, a pivot member secured to said body portion and engaging said trunnion member, and spring members interposed between said body portion and said frame member thereby to maintain said pivot member in engagement with said trunnion member.
  • An electrical transducer comprising a stylus holder member having a longitudinally extending portion, a body portion at one end of said longitudinally extending portion, said body portion extending in two mutually perpendicular directions substantially perpendicular to the longitudinal axis of said longitudinally extending portion and having an axial projection extending therefrom, and associated journal means engaging said projection for providing rotational movement of said longitudinally extending portion about at least two mutually perpendicular axes passing through the center of said body portion, and means including said body portion for generating two electrical signals each indicative of the degree of rotation of said longitudinally extending portion about a given respective one of said axes.
  • said signal-generating means comprises a permanent magnet system secured to said body portion and means comprising an electromagnetic system operatively associated with said permanent magnetic system.

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  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnetism (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
  • Position Input By Displaying (AREA)
US814556A 1958-06-20 1959-05-20 Stereophonic phonograph transducer Expired - Lifetime US3576956A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL228905 1958-06-20

Publications (1)

Publication Number Publication Date
US3576956A true US3576956A (en) 1971-05-04

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ID=19751258

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US814556A Expired - Lifetime US3576956A (en) 1958-06-20 1959-05-20 Stereophonic phonograph transducer

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US (1) US3576956A (en(2012))
CH (1) CH384887A (en(2012))
DE (1) DE1174085B (en(2012))
ES (1) ES250197A1 (en(2012))
FR (1) FR1227785A (en(2012))
GB (1) GB927149A (en(2012))
NL (2) NL228905A (en(2012))

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904837A (en) * 1972-10-19 1975-09-09 Hitachi Ltd Magnetic pickup cartridge
US4124782A (en) * 1975-07-29 1978-11-07 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Sound pickup having plastic enveloped pole plate to pole rod junction

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5487504A (en) * 1977-12-23 1979-07-12 Alps Electric Co Ltd Electromagnetic pickup cartridge

Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1520378A (en) * 1920-07-03 1924-12-23 Hugh C Lord Apparatus for recording and reproducing sound
GB336648A (en) * 1929-07-15 1930-10-15 Herbert Edward Holman Improvements in and relating to electrical sound reproducing instruments
US2093540A (en) * 1931-12-14 1937-09-21 Emi Ltd Sound-transmission, sound-recording, and sound-reproducing system
US2114471A (en) * 1936-06-20 1938-04-19 Bell Telephone Labor Inc Sound recording and reproducing system
US2507188A (en) * 1947-05-13 1950-05-09 Herbert K Neuber Electrostatic phonograph pickup
US2507708A (en) * 1945-12-22 1950-05-16 Pennsylvania Electronics Inc Phonograph pickup having permanent magnet armature
GB789367A (en) * 1955-07-02 1958-01-22 Telefunken Gmbh Improvements in or relating to electro-mechanical transducers for use in sound recording or reproducing systems
US2864897A (en) * 1958-02-17 1958-12-16 Hoffman Electronics Corp Universal phonograph pickup head or the like
US2875282A (en) * 1953-10-06 1959-02-24 Earl M Reiback Binaural phonograph pickup
US2947821A (en) * 1955-06-20 1960-08-02 Erie Resistor Corp Ceramic binaural phonograph pickup
US3055988A (en) * 1957-04-08 1962-09-25 Shure Bros Magnetic phonograph pickup

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB394325A (en) * 1931-12-14 1933-06-14 Alan Dower Blumlein Improvements in and relating to sound-transmission, sound-recording and sound-reproducing systems
DE816311C (de) * 1949-05-04 1951-10-08 Telefunken Gmbh Tonabnehmer
NL99355C (en(2012)) * 1956-03-16
DE1031536B (de) * 1956-03-16 1958-06-04 Teldec Telefunken Decca Mechanisch-elektrischer Wandler fuer die Erzeugung oder Abtastung einer rillenfoermigen Tonspur
DE1076385B (de) * 1958-01-21 1960-02-25 Fonofilm Ind As Mechanisch-elektrischer Wandler fuer die Erzeugung oder Abtastung einer rillenfoermigen Tonspur

Patent Citations (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1520378A (en) * 1920-07-03 1924-12-23 Hugh C Lord Apparatus for recording and reproducing sound
GB336648A (en) * 1929-07-15 1930-10-15 Herbert Edward Holman Improvements in and relating to electrical sound reproducing instruments
US2093540A (en) * 1931-12-14 1937-09-21 Emi Ltd Sound-transmission, sound-recording, and sound-reproducing system
US2114471A (en) * 1936-06-20 1938-04-19 Bell Telephone Labor Inc Sound recording and reproducing system
US2507708A (en) * 1945-12-22 1950-05-16 Pennsylvania Electronics Inc Phonograph pickup having permanent magnet armature
US2507188A (en) * 1947-05-13 1950-05-09 Herbert K Neuber Electrostatic phonograph pickup
US2875282A (en) * 1953-10-06 1959-02-24 Earl M Reiback Binaural phonograph pickup
US2947821A (en) * 1955-06-20 1960-08-02 Erie Resistor Corp Ceramic binaural phonograph pickup
GB789367A (en) * 1955-07-02 1958-01-22 Telefunken Gmbh Improvements in or relating to electro-mechanical transducers for use in sound recording or reproducing systems
US3055988A (en) * 1957-04-08 1962-09-25 Shure Bros Magnetic phonograph pickup
US2864897A (en) * 1958-02-17 1958-12-16 Hoffman Electronics Corp Universal phonograph pickup head or the like

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Manufacture of a High-Quality Cartridge, Carlson, Audio Magazine, 8/58, pp. 30 33. *

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3904837A (en) * 1972-10-19 1975-09-09 Hitachi Ltd Magnetic pickup cartridge
US4124782A (en) * 1975-07-29 1978-11-07 Akg Akustische U. Kino-Gerate Gesellschaft M.B.H. Sound pickup having plastic enveloped pole plate to pole rod junction

Also Published As

Publication number Publication date
DE1174085B (de) 1964-07-16
NL112985C (en(2012))
GB927149A (en) 1963-05-29
ES250197A1 (es) 1959-10-01
CH384887A (de) 1965-02-26
NL228905A (en(2012))
FR1227785A (fr) 1960-08-24

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