US3760125A - Magnetic pick up with fluxbridge and replaceable stylus - Google Patents

Magnetic pick up with fluxbridge and replaceable stylus Download PDF

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Publication number
US3760125A
US3760125A US00240879A US3760125DA US3760125A US 3760125 A US3760125 A US 3760125A US 00240879 A US00240879 A US 00240879A US 3760125D A US3760125D A US 3760125DA US 3760125 A US3760125 A US 3760125A
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US
United States
Prior art keywords
armature
pole pieces
disposed
needle
magnetic
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
US00240879A
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English (en)
Inventor
E Laue
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.)
DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GmbH
Original Assignee
Dual Gebruder Steidinger GmbH and Co
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
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Application granted granted Critical
Publication of US3760125A publication Critical patent/US3760125A/en
Assigned to DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH reassignment DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,
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 present invention relates to a magnetic tone pickup for the reproduction of a sound groove modulated in two directions disposed perpendicularly towards each other with a rod-shaped armature needleunit, the needle carrier of which carries at one end a sensing point and at the other end a magnet armature which is retained in an elastic bearing swingable towards all sides such, that the one end of the anchor armature is disposed in the center of four ends of pole pieces disposed symmetrically about the center at a short distance, which pole pieces are in connection at the other end with intermediate arrangement of an air gap with one pole of a joint, permanent magnet, the counter pole of which is in connection as a joint fifth pole with the other armature end.
  • tone pickups of the above described type there is a core of a spool each of the four pole pieces and two oppositely disposed spools are joined in series to an electric winding.
  • the advantage of such arrangement resides in the fact of a non-symmetric position of the armature to the pole end, which leads to a different induction in the spools, is equalized by the series arrangement of the spools.
  • the four spools necessary thereby constitute non-neglectable expenditure.
  • Other tone pickups with only two variable air gaps or magnetic circuits, respectively, each with only one spool, and of a lesser expenditure do not have, however, the equalization effect.
  • Tone pickups with an anchor swinging between four poles are, as a rule, designed such, that the mounting unit necessary for the needle change comprises the armatureneedle-unit, the elastic bearing or support and a small tube surrounding the other elements, which small tube is insertable between the four poles.
  • the small tube is thereby necessary for a safe manipulation during the needle exchange and the maintenance of the mechanical characteristics in case of a needle change.
  • certain limits are set, in case of a small inner impedance. This applies to the four operating air gaps, as well as to the air gap at the fifth pole.
  • a tone pickup is known, though, the armature-needle-unit of which is provided in a small tube, which is rigidly embedded, on the one hand, in a mounting unit serving the needle change, which mounting unit contains simultaneously also pole pieces.
  • This mounting unit is pressed by means of screws against connection-pole pieces disposed in the tone pickup.
  • Such arrangement is, however, expensive, since once two connectable pole pieces are required for the magnetic circular part from the armature to the spools and, on the other hand, additional securing means for the mounting unit, which brings about also a complicated manipulation.
  • the armature for the pickups of the above stated type is, as a rule, a prismatic body, which, during swinging about a point of its longitudinal axis, comes closer with its end to one of the ends of the pole pieces.
  • a much larger swinging angle of the armature is required, as it corresponds with the modulation of the sound groove, which means, the air gap must be appreciably larger than it is required by the transmitter function.
  • a smaller air gap results, however, in the smaller magnetic impedance and thereby a greater sensitivity or a lower inner impedance of the pickup also, which both are of essential advantage.
  • the impedance of the magnetic circuit is to be reduced, without narrowing the swinging range of the armature.
  • FIG. 1 is a longitudinal section of a magnetic tone pickup and in particular, along the lines I-I of FIG. 2;
  • FIG. 2 is a section along the lines II-II of FIG. 1;
  • FIG. 3 is a section of an exchangeable mounting unit with the armature-needle-unit shown at an enlarged scale.
  • the pickup in accordance with the present invention comprises substantially a permanent magnet 1, a front and a rear yoke sheet 2 and 3, four magnetically conducting pole pieces 4 to 7, which are connected in pairs each by a magnetically conducting bridges 8 and 9, each of which carries a spool 10 and 11, Between the pole ends 12 and 13 of the pole pieces 4 and 5 and the front yoke sheet 2 is disposed an armature 14, which forms a single unit with a needle carrier 15 with a sensing point 16.
  • Each pole piece 4 to 7 is a part of a particular parallel disposed magnetic flux circuit, the impedance of which is varied by a swinging of the anchor 14 about its rotary point 17, as will be more clearly disclosed below, and, in particular, an increase in one pole piece corresponds to a decrease in the oppositely disposed pole piece.
  • the front yoke sheet 2 is rigidly connected with the pole pieces 4 to 7 by means of a body 22 of synthetic material.
  • the projecting ends of the pole pieces are formed as plugs and insertable into corresponding recesses on the tone pickup, whereby a geometrically exact and reliable connection with the yoke sheet 3 and the bridges 8 and 9 is brought about.
  • This arrangement permits the use of spools 10 and 11 without spool bodies, without inviting the danger thereby, that the spools could be damaged by insertion of the pole pieces.
  • the front yoke sheet 2 forms a fifth pole l8 and, simultaneously, a screen for the four operating air gaps on the armature and makes possible thereby a joint-less connection of the spool screen 23,
  • the armature 14 is pulled via an intermediate arrangement of a rubber disk 25 against a disk 26, the latter sitting rigidly in the body 22 of the synthetic material.
  • the dimensions are chosen such, that the point 17, about which an armature needle unit is swingable, coincides with the substantially semi center point of the ball, which forms partly the armature surface, so that the width of the air gap 17" is not changed if the armature 6 pivots.
  • the air gap b" can be maintained very small thereby.
  • the surface of the armature 14 is overlapped by the pole ends 12 and 13 in the range of the measure a. During swinging of the armature 14 about its rotary point 17, this overlapping measure a varies and thereby the magnetic impedance, while it remains constant between the armature l4 and the joint fifth pole 18.
  • a pick up comprising a magnetic flux-conducting armature
  • a sensing needle secured to a free end of said needleholder and together with said armature constituting an armature-needle unit
  • an elastic support means for holding said armatureneedle unit swingable about a longitudinal axis in a carrying body
  • a magnetically flux-conducting return path means being adjacent said armature and slightly spaced therefrom,
  • a permanent magnet operatively arranged between said return path means and said free ends of said pole pieces, and stationarily disposed, a magnetically flux-conducting bridge disposed between each of said pair of oppositely disposed pole pieces, and
  • a mounting unit attachable to a magnetic pick up
  • a sensing needle secured to a free end of said needle holder and constituting together with said armature an armature-needle unit
  • said free ends, remote from said anchor of said pole pieces being formed as four parallel disposed pins adapted to form a complete four-line path upon plugging to a pickup, and
  • a magnetically flux-conducting path means secured to said carrying body and being adjacent said armature and slightly spaced therefrom and constituting a fifth pole opposite to said one ends of said four pole pieces,
  • a mounting unit connectable with a magnetic pickup comprising a carrying body defining a longitudinal axis
  • a rod-shaped needle holder connected coaxially with said armature and projecting on the side of said ball and constituting together with said armature an armature-needle unit

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Electromagnets (AREA)
  • Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US00240879A 1971-03-29 1972-03-31 Magnetic pick up with fluxbridge and replaceable stylus Expired - Lifetime US3760125A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2115122A DE2115122C3 (de) 1971-03-29 1971-03-29 Magnetischer Tonabnehmer

Publications (1)

Publication Number Publication Date
US3760125A true US3760125A (en) 1973-09-18

Family

ID=5803100

Family Applications (1)

Application Number Title Priority Date Filing Date
US00240879A Expired - Lifetime US3760125A (en) 1971-03-29 1972-03-31 Magnetic pick up with fluxbridge and replaceable stylus

Country Status (3)

Country Link
US (1) US3760125A (de)
CH (1) CH533407A (de)
DE (1) DE2115122C3 (de)

Cited By (6)

* 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
US3918723A (en) * 1973-07-09 1975-11-11 Sony Corp Cantilever for use with pickup cartridge
US3964751A (en) * 1975-07-31 1976-06-22 Pickering & Company, Inc. Phonograph cartridge replaceable stylus assembly
US4103116A (en) * 1974-12-05 1978-07-25 Nippon Gakki Seizo Kabushiki Kaisha Pickup cartridge with moving magnet armature
US4136884A (en) * 1976-03-18 1979-01-30 Nippon Gakki Seizo Kabushiki Kaisha Electromagnet type pickup device
US4364120A (en) * 1978-10-06 1982-12-14 Kabushiki Kaisha Audio-Technica Pickup cartridge of moving coil type for phonograph

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3062925A (en) * 1960-05-02 1962-11-06 Gen Electric Phonograph pickup cartridge and replaceable stylus therefor
US3220737A (en) * 1965-04-19 1965-11-30 Gen Electric Attachment of a needle-carrying member in a phonograph stylus assembly
US3220738A (en) * 1965-04-19 1965-11-30 Gen Electric Method and apparatus for mounting the needle-carrying member of a phonograph stylus assembly
US3469040A (en) * 1965-04-15 1969-09-23 Empire Scient Corp Variable reluctance phonograph cartridge
US3614332A (en) * 1958-10-03 1971-10-19 Motohiro Nagasaki Electromagnetic stereophonic phonograph pickup

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3614332A (en) * 1958-10-03 1971-10-19 Motohiro Nagasaki Electromagnetic stereophonic phonograph pickup
US3062925A (en) * 1960-05-02 1962-11-06 Gen Electric Phonograph pickup cartridge and replaceable stylus therefor
US3469040A (en) * 1965-04-15 1969-09-23 Empire Scient Corp Variable reluctance phonograph cartridge
US3220737A (en) * 1965-04-19 1965-11-30 Gen Electric Attachment of a needle-carrying member in a phonograph stylus assembly
US3220738A (en) * 1965-04-19 1965-11-30 Gen Electric Method and apparatus for mounting the needle-carrying member of a phonograph stylus assembly

Cited By (7)

* 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
US3918723A (en) * 1973-07-09 1975-11-11 Sony Corp Cantilever for use with pickup cartridge
US4103116A (en) * 1974-12-05 1978-07-25 Nippon Gakki Seizo Kabushiki Kaisha Pickup cartridge with moving magnet armature
US3964751A (en) * 1975-07-31 1976-06-22 Pickering & Company, Inc. Phonograph cartridge replaceable stylus assembly
FR2319952A1 (fr) * 1975-07-31 1977-02-25 Pickering & Co Inc Ensemble porte-aiguille remplacable pour tete de lecture de disques
US4136884A (en) * 1976-03-18 1979-01-30 Nippon Gakki Seizo Kabushiki Kaisha Electromagnet type pickup device
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
CH533407A (de) 1973-01-31
DE2115122A1 (de) 1972-10-12
DE2115122C3 (de) 1974-01-24
DE2115122B2 (de) 1973-06-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: DEWEK VEREINIGTE DEUTSCHE ELECTRONIC-WERKE GMBH, 7

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:DUAL GEBRUDER STEIDINGER GMBH U. CO. 1.K,;REEL/FRAME:004356/0863

Effective date: 19841212