US3925628A - Electromagnetic sound pick-up - Google Patents

Electromagnetic sound pick-up Download PDF

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Publication number
US3925628A
US3925628A US365841A US36584173A US3925628A US 3925628 A US3925628 A US 3925628A US 365841 A US365841 A US 365841A US 36584173 A US36584173 A US 36584173A US 3925628 A US3925628 A US 3925628A
Authority
US
United States
Prior art keywords
armature
pick
cylindrical
quadrilateral
sound pick
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
US365841A
Other languages
English (en)
Inventor
Hans-Robert Kuhn
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.)
ELAC Electroacustic GmbH
Original Assignee
ELAC Electroacustic GmbH
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 ELAC Electroacustic GmbH filed Critical ELAC Electroacustic GmbH
Publication of USB365841I5 publication Critical patent/USB365841I5/en
Application granted granted Critical
Publication of US3925628A publication Critical patent/US3925628A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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
    • 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

  • the invention relates to an electromagnetic sound pickup, preferably for reproduction of stereo sound with 90 phase shift matrixing between individual channels, wherein an armature fixed to the needle carrier is elastically flexible between the ends of two pole shoes and with the same flexibility in all flex directions.
  • a cylindrical cross section has the advantage that the armature has a uniform stiffness or deflection resistance in all directions of deflection, however, in contrast to a quadrilateral cross section, the disadvantage that, with it, the effective air gap between armature and the pick-up pole shoe ends is greater.
  • an armature with quadrilateral cross section can, without more, be positioned so that it has the completely equal stiffness or deflection resistance in all deflection directions.
  • the object of the invention is, therefore, to provide a sound pick-up with the advantages of armatures of cylindrical cross section and those of armatures with quadrilateral cross section combined. According to the invention, this is accomplished by constructing the armature cross section cylindrically in the region of its mounting, and quadrilaterally in the remaining part of its length.
  • the armature be formed of two parts of quadrilateral cross section with bores in the lengthwise direction, these being separated from each other by the breadth of the armature support on the free end of the needle carrier which is cylindrical at least in the region of the width of the armature mounting.
  • FIGS. 1 and 2 show two different embodiments of armatures constructed in accordance with the invention. Corresponding parts-of both figures are shown by identical numerals.
  • FIG. 1 depicts a single piece armature l which has the needle holder 2 with the needle 3.
  • the central region in which the armature l is to be mounted, is
  • the armature support 4 is made of elastic material, and so without difficulty can be slid over the quadrilateral end of armature 1 to the central mounting region without difficulty.
  • a three piece armature 1 comprises the both quadrilateral partial pieces 1a and lb, which are bored through in their lengthwise directions. Both these partial pieces 1a and 1b are slid on and secured on the free cylindrical end of the needle holder 2 of cylindrical cross section and separated from each other as shown. Before the partial piece 1b is slid on the needle carrier 2, the armature support 4 is slid on needle carrier 2.
  • the armature can flex equally well in all directions in its cylindrical mounting 4.
  • the pole shoes may be mounted with a smaller effective air gap than if the pole shoes of the pick-up were mounted over a cylindrical armature.
  • the pick-up shoes may be as shown in US. Pat. No. 3,463,889, which shows a square armature.
  • FIG. 2 shows a three piece embodiment of the invention which operates in the same manner as the embodiment of FIG. 1.
  • An electromagnetic sound pick-up armature for reproduction of stereo sound signals having phase shift between individual channels comprising an armature. secured to a needle carrier, said armature being elastically deflectable with uniform stiffness in all deflection directions, the cross section of the armature being cylindrical in the region of its mounting and quadrilateral in the part of its length, which is adapted to be inserted between the ends of two pole shoes of a magnetic pick-up.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)
  • Adjustment Of The Magnetic Head Position Track Following On Tapes (AREA)
US365841A 1972-07-20 1973-06-01 Electromagnetic sound pick-up Expired - Lifetime US3925628A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2235484 1972-07-20

Publications (2)

Publication Number Publication Date
USB365841I5 USB365841I5 (de) 1975-01-28
US3925628A true US3925628A (en) 1975-12-09

Family

ID=5851088

Family Applications (1)

Application Number Title Priority Date Filing Date
US365841A Expired - Lifetime US3925628A (en) 1972-07-20 1973-06-01 Electromagnetic sound pick-up

Country Status (3)

Country Link
US (1) US3925628A (de)
JP (1) JPS5117887B2 (de)
DE (1) DE2235484C2 (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023435A1 (de) * 1979-07-30 1981-02-04 Bauer, Ida Kassette für Grammophon-Abtaster
US6049919A (en) * 1999-07-14 2000-04-18 Roteman; Gary Solar heated portable shower

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463889A (en) * 1957-10-30 1969-08-26 Shure Bros Moving magnet stereophonic pickup
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3763335A (en) * 1971-02-23 1973-10-02 Matsushita Electric Ind Co Ltd Pickup cartridge with magnet armature having opposite axial sides of like polarity and central portion of opposite polarity

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3463889A (en) * 1957-10-30 1969-08-26 Shure Bros Moving magnet stereophonic pickup
US3576955A (en) * 1967-08-22 1971-05-04 Matsushita Electric Ind Co Ltd Armature assembly for magnetic-type phonograph pickup
US3763335A (en) * 1971-02-23 1973-10-02 Matsushita Electric Ind Co Ltd Pickup cartridge with magnet armature having opposite axial sides of like polarity and central portion of opposite polarity

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0023435A1 (de) * 1979-07-30 1981-02-04 Bauer, Ida Kassette für Grammophon-Abtaster
US6049919A (en) * 1999-07-14 2000-04-18 Roteman; Gary Solar heated portable shower

Also Published As

Publication number Publication date
DE2235484B1 (de) 1974-02-07
JPS5117887B2 (de) 1976-06-05
JPS4946404A (de) 1974-05-04
USB365841I5 (de) 1975-01-28
DE2235484C2 (de) 1974-08-29

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