EP0160279A2 - Circuit de mise à terre pour pick-up du type à bobine mobile - Google Patents

Circuit de mise à terre pour pick-up du type à bobine mobile Download PDF

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Publication number
EP0160279A2
EP0160279A2 EP85105095A EP85105095A EP0160279A2 EP 0160279 A2 EP0160279 A2 EP 0160279A2 EP 85105095 A EP85105095 A EP 85105095A EP 85105095 A EP85105095 A EP 85105095A EP 0160279 A2 EP0160279 A2 EP 0160279A2
Authority
EP
European Patent Office
Prior art keywords
armature
magnetic circuit
pickup cartridge
moving coil
grounding
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.)
Withdrawn
Application number
EP85105095A
Other languages
German (de)
English (en)
Other versions
EP0160279A3 (fr
Inventor
Hisayoshi Nakatsuka
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.)
Namiki Precision Jewel Co Ltd
Original Assignee
Namiki Precision Jewel Co Ltd
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 claimed from JP1984062392U external-priority patent/JPS60174395U/ja
Priority claimed from JP19861684U external-priority patent/JPS61113500U/ja
Application filed by Namiki Precision Jewel Co Ltd filed Critical Namiki Precision Jewel Co Ltd
Publication of EP0160279A2 publication Critical patent/EP0160279A2/fr
Publication of EP0160279A3 publication Critical patent/EP0160279A3/fr
Withdrawn legal-status Critical Current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
    • H04R9/00—Transducers of moving-coil, moving-strip, or moving-wire type
    • H04R9/12—Gramophone pick-ups using a stylus; Recorders using a stylus
    • H04R9/16—Gramophone pick-ups using a stylus; Recorders using a stylus signals recorded or played back by vibration of a stylus in two orthogonal directions simultaneously

Definitions

  • This invention relates to a moving coil pickup cartridge and, in particular, to the grounding of the magnetic circuit for such a cartridge.
  • a moving coil type pickup cartridge may include an armature 3 having a generator coil 2 wound thereabout.
  • the rear of a cantilever 1 is joined at the center of the armature, the cantilever having a stylus tip at its front end.
  • a ring-shaped damper 5 is placed between armature 3 and a pole-piece 4 and the unit is held in place by a stopper 6 formed within the cantilever, a stopper 6' inserted and fixed in pole-piece 4, and suspension wire 7.
  • the magnetic circuit for the cartridge is comprised of a magnet'8, a rear yoke 9, pole-piece 4, armature 3, and front yoke 10.
  • Output voltage is induced in generator coil 2 by rotation of armature 3 during record reproduction, the coil output being applied to output terminals 11 comprising hot terminal H and ground terminal G. Since the space between the generator coil and armature is, in essence, insulated, the metal parts of the main structure including armature 3 must be electrostatically equipotential with generator coil 2 in order to eliminate capacitance and inductance generated in space. Consequently, measures have been taken to ground the magnetic circuit by connecting the ground line G of output terminals 11 to the rear end of pole-piece 4 or rear yoke 9 as shown in Fig.l. These measures have been taken to improve the reproduced sound quality response and the high frequency range.
  • grounding the magnetic circuit at a position substantially removed from the armature 3 or at a position of the armature 3 itself contributes most to improved sound quality.
  • the grounding should occur on the surface of front yoke 10 and, most preferably, at the end of the front yoke which is farthest removed from the armature, in case of the latter grounding should occur on the center part of the armature 3.
  • ground terminal G of output terminals 11 is connected to front yoke 10, which is the (7it;cuit component of the magnetic/farthest from the armature in the sequence of armature 3, pole-piece 4, rear yoke 9, and magnet 8.
  • the magnetic circuit comprises in series connection, armature 3, pole-piece 4, rear yoke 9, magnet 8, and front yoke 10.
  • Generator coil 2 is positioned in parallel with armature 3 and an electrostatic potential response having an uni-directionality becomes possible by grounding earth line 12 to the grounding position 13 of the series arranged elements 3, 4, 9, 8 and 10 in the magnetic circuit.
  • grounding terminal G of output terminal 11 is connected to armature 3, which is another end component of the said series magnetic circuit.
  • armature 3 is another end component of the said series magnetic circuit.
  • An electrostatic potential response having an uni-directionality becomes possible by grounding earth line 12' to the grounding position 13' of the series arranged elements 10, 8, 9, 4 and 3 in the magnetic circuit.
  • it is most preferable to establish the ground at either end part of the series magnetic circuit one is the remote end P of the front yoke, which is positioned at the point farthest from the armature in the magnetic circuit, as shown in Fig.2.
  • Another is the armature itself as shown in Fig.4.
  • the sound quality reproduced by the pickup cartridge of the present invention displays improved characteristics in the high frequency range, improved clarity in the midrange, and improved responses in the low range. Other improvements such as reduced play-back distortion were obtained.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Moving Of Heads (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP85105095A 1984-04-27 1985-04-26 Circuit de mise à terre pour pick-up du type à bobine mobile Withdrawn EP0160279A3 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
JP1984062392U JPS60174395U (ja) 1984-04-27 1984-04-27 ピツクアツプ・カ−トリツジ
JP62392/84U 1984-04-27
JP198616/84U 1984-12-26
JP19861684U JPS61113500U (fr) 1984-12-26 1984-12-26

Publications (2)

Publication Number Publication Date
EP0160279A2 true EP0160279A2 (fr) 1985-11-06
EP0160279A3 EP0160279A3 (fr) 1987-04-01

Family

ID=26403448

Family Applications (1)

Application Number Title Priority Date Filing Date
EP85105095A Withdrawn EP0160279A3 (fr) 1984-04-27 1985-04-26 Circuit de mise à terre pour pick-up du type à bobine mobile

Country Status (1)

Country Link
EP (1) EP0160279A3 (fr)

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3846592A (en) * 1973-03-29 1974-11-05 W Stanton Phonograph pickup cartridge for four channel recordings
US3904837A (en) * 1972-10-19 1975-09-09 Hitachi Ltd Magnetic pickup cartridge

Patent Citations (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
US3846592A (en) * 1973-03-29 1974-11-05 W Stanton Phonograph pickup cartridge for four channel recordings

Also Published As

Publication number Publication date
EP0160279A3 (fr) 1987-04-01

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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Effective date: 19870805

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Effective date: 19890208

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18W Application withdrawn

Withdrawal date: 19891208

RIN1 Information on inventor provided before grant (corrected)

Inventor name: NAKATSUKA, HISAYOSHI