US3665123A - Cartridge for pickup - Google Patents

Cartridge for pickup Download PDF

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Publication number
US3665123A
US3665123A US39613A US3665123DA US3665123A US 3665123 A US3665123 A US 3665123A US 39613 A US39613 A US 39613A US 3665123D A US3665123D A US 3665123DA US 3665123 A US3665123 A US 3665123A
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US
United States
Prior art keywords
pole
support
needle
pole piece
pole pieces
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
US39613A
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English (en)
Inventor
Kazuhiro Ikeda
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.)
MESSRS MITACHI ONKYO SEISAKUSH
Original Assignee
MESSRS MITACHI ONKYO SEISAKUSH
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 JP3319170A external-priority patent/JPS514642B1/ja
Application filed by MESSRS MITACHI ONKYO SEISAKUSH filed Critical MESSRS MITACHI ONKYO SEISAKUSH
Application granted granted Critical
Publication of US3665123A publication Critical patent/US3665123A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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 pickup cartridge comprises a needle support mounted for vibration in accordance with sound tracks on a record engaged by a needle mounted on the support, and includes two pairs of pole pieces mounted in spaced parallel relation, with each pair including a first pole piece and a second pole piece interconnected by a respective magnetic coil holder.
  • the two first pole pieces have pole faces at corresponding ends thereof in spaced relation with the support, and with the pole faces extending in perpendicular facing relation to each other.
  • Respective coils embrace each pole piece, with the coil on each second pole piece being wound reversely relative to the coil on the associated first pole piece and connected in series therewith.
  • the support may comprise a paramagnetic metal tube in operative association with a fixedly position permanent magnet, or may comprise a tubular permanent magnet.
  • Tension means are provided to preset the fulcrum of the support, and a mu-metal member is paced near the pole faces and the support to form a vertical compensation plate.
  • the pickup cartridge comprises a cartridge case mounting the pole pieces and a needle case mounting the needle support and readily assembled with the cartridge case.
  • FIG. I4 5 Y INVENTQR NAZUHIRO IKEDA mcwikm SUMMARY OF INVENTION
  • the present invention generally relates to an electro-mag netic pickup and further to a pickup cartridge for a stereo record in which sound grooves provided on the opposite walls of one groove, and a stereo record in which the directions of modulation of two sound grooves are perpendicular to each other as is at present quite general.
  • the object of the present invention is to solve these problems and to provide a pickup cartridge in which the problems are kept at the minimum.
  • the object of only taking out an output voltage is sufficiently achieved by means of only a coil near the vibrator, but the present invention is characterized in that four coils are used and the mutual coils of each channel are differentially wound and provided so as to cancel external magnetic induction.
  • the coil especially provided serves for the increase in output voltage and the present invention is widely different from the conventional variable reluctance type in respect of this point.
  • the coils of each channel are cross connected by means of the yoke in view of the generator type and this causes crosstalk unless sufiicient precautions are taken.
  • there is no necessity to cross each coil so that the present invention serves to decrease crosstalk. It is needless to say that crossing of the yoke practically does not cause any problem.
  • FIG. 1 is a perspective view of a first embodiment of the invention for the explanation of the principle of the present invention
  • FIG. 2 is a vertical section view
  • FIG. 3 is a plan view of a needle case
  • FIG. 4 is a front view thereof
  • FIG. 5 is a rear view thereof
  • FIG. 6 is a plan view of a cartridge case
  • FIG. 7 is a front view of FIG. 6;
  • FIG. 8 is a side view of the cartridge case
  • FIG. 9 is a perspective view of a second embodiment for the explanation of the principle of the present invention.
  • FIG. 10 is a vertical section view thereof
  • FIG. 11 is a plan view of a needle case
  • FIG. 12 is a front view thereof
  • FIG. 13 is a rear view thereof
  • FIG. 14 is a plan view of a cartridge case
  • FIG. 15 is a front view of FIG. 14.
  • FIG. 16 is a side view ofthe cartridge case.
  • a pickup shown in FIGS. 1-8 has a cartridge case 18 com other end.
  • An electro-rnagnetic circuit is contained in the case 18 and in a stereo type the circuits end at contact pins 26, 27 and each circuit has a pair of coil forms 22 and a respective coil form holder 5 or 6 and is equipped with a respective polepiece 1 or 3, with the two pole pieces being in position opposite to each other.
  • the pole pieces 1, 3 face each other at an angle of
  • Each coil form holder 5 and 6 has a pair of spaced legs extending therefrom in substantially parallel relation.
  • pole pieces 1 and 2 are juxtaposed with respective pole pieces 1 and 2, and those of coil form holder 6 are juxtaposed with respective pole pieces 3 and 4.
  • Pole pieces 1 and 2 are wound with respective windings 8 and 7, which are wound in respective opposite directions and connected in series with each other.
  • Pole pieces 3 and 4 are wound with respective windings 10 and 9, which are wound in respective opposite directions and are connected in series with each other.
  • the two magnetic circuits are enclosed in cases 20, 21 of p. materials, and the cases 20, 21 of a materials are secured to the inside of the cartridge case 18 with a part partially projected to the outside.
  • Each coil is connected to a respective contact pin 19 by means of a respective lead wire 28 with soldering or the like.
  • a cover 29 is fixed to the hollow pan of the case 18 with adhesive.
  • in the needle case 23 there are grooves 30 adapted to projections 31 of the cartridge case 18 in order to carry out the needle assembling at a proper angle.
  • a needle support is provided to hold the needle, and includes a very light but strong aluminum tube 13, for example, which is mounted in a short tube 12 forming a vibrator of magnetic material, such as soft iron, and which is supported by a suitable elastic body 15 which may be rubber.
  • a permanent magnet 11 is fixedly positioned in cartridge case 18 under tube 12 (hereinafter referred to as the vibrator) in such a manner that permanent magnet 11 may come just under the pipe 12, forming the vibrator, when the needle case 23 is fitted to the cartridge case 18, whereby the vibrator 12 is magnetized.
  • the needle 14 can freely move in a desired plane, namely at a proper angle to the direction of the record groove.
  • tube 12 overlies the pole pieces 1 and 3, and terminates at the inner edges of these pole pieces.
  • Grooves 32 of the needle case 23 position damper rubber 15 and the damper rubber 15 is accurately fixed by a damper adapter 24.
  • Grooves 33 of needle case 23 form openings for pole pieces 1, 3, and grooves 34 of needle case 23 receives fixing a metal plate 17, which controls the movement of the vibrator 12, and fixes a tension wire 16 for determining the fulcrum of vibration.
  • the needle case 23 is moved in the direction indicated by arrow F in FIG. 2 until it just fits on the projections 31 of cartridge case 18.
  • Grooves 35 (FIG. 6 and FIG. 8) serves to position the cartridge accurately a pickup arm.
  • a movement transmitted to the needle 14 by a record is transmitted to the vibrator 12 through the cantilever 13, and vibrator 12, arranged very close to the surfaces of pole pieces 1, 3, causes a magnetic flux variation in these pole pieces responsive to modulations in the wall or walls of the record groove.
  • the fulcrum of the needle case 23 is further approachable to the surface of the record and can reach an optimum vertical tracking angle (15), and the vertical movement of the needle closely follows the direction to which a vertical modulation is cut in the record. A very severe vertical tracking distortion is thereby substantially eliminated.
  • the needle case 23 eliminates the difficulties hitherto necessary to insert a needle assembly into a long holder, and simplifies the assembly of two parts. Additionally, assembly and inspection are facilitated because all parts of the movable needle structure appear on the outside of the cartridge.
  • a cantilever arm of non-ferrous metal and very light weight, to support the needle, the effective mass at the needle-point is remarkably decreased as compared to a general moving magnet. The decrease in the mass obtained thereby changes the vibration mass of the cantilever of the movable needle, so that a resonance occurs at a frequency higher than the audiofrequency zone, whereby distortion of the sound is obviated. The decrease in this mass extends the life of the record.
  • a cartridge of the second embodiment as shown in FIGS. 9-16 has a cartridge case 18 comprising a suitable plastic material, a terminal plate 25 with contact pins 19 mounted at one end of the case 18, and a needle case 23, detachable from the case 18, connected to the other end.
  • An electro-magnetic circuit is contained in case 23.
  • the circuits end at respective contact pins 26 and 27, and each circuit includes a pair of windings on coil forms 22 on coil hol ders 5, 6, and further includes two pole pieces 1, 3 arranged opposite each other in facing relation. As best seen in FIG. 9, these pole pieces or faces are in perpendicular facing relation with each other.
  • a cantilever support for the needle includes a light but strong aluminum tube 13 inserted into a tubular vibrator 12 comprising magnetic materials such as soft iron supported by a suitable elastic body ofa material like rubber.
  • Grooves 32 of the needle case 23 position damper rubber l5, and the damper rubber 15 is accurately fixed by a damper adapter 24.
  • Grooves 33 of case 23 provide openings for the pole pieces 1, 3.
  • the needle case 23 is moved in the direction indicated by arrow F in FIG. 10 until it just fits on the projection 31 of the cartridge case 18.
  • Grooves 35 serve to seat the cartridge on a pickup arm. It will be observed that vibrator 12 overlies, in spaced relation, pole pieces 1 and 3 and terminates at the inner edges of these pole pieces.
  • a movement transmitted to the needle 14 by a record is transmitted to the vibrator 12, comprising a permanent magnet, through the cantilever 13, and the vibrator 12 arranged extremely close to the surfaces of a pair of pole pieces 1, 3, and causes a magnetic flux variation in the pole piece in response to a modulation in the record groove wall.
  • numeral 36 indicates a vertical compensation plate which is made of pi material such as permalloy or the like and, by placing this plate, a channel separation can simply be kept at db or more.
  • the largest dispersion in the conventional stereo cartridge was a channel separation but vertical compensation plate 36 eliminates this defect.
  • the function of plate 36 will be explained below.
  • the movement transmitted to a record needle 14 is transmitted to the vibrator 12 through the cantilever 13.
  • the vibrator 12 vertically vibrates but, namely, in case the vibrator 12 moves in the direction of y-y' and in case it moves in the direction of x-x', the direction of x-x' is entirely symmetrical but the direction of y-y is not symmetrical, so that the quantity of magnetic flux variation varies depending upon the above two different directions.
  • a quantity of magnetic flux variation is smaller than the case of the direction of x-x' and consequently the output is not entirely the same.
  • the vertical compensation plate 36 is provided, whereby it is possible to equalize the output voltages, namely, the quantity of magnetic flux variation in the .r-x' direction to that in the y-y direction, and channel separation can be improved.
  • the coil 10 and the coil 9 do not have equal output voltages, and almost percent or more of the output voltage is obtained by the coil 10.
  • the reason why the coil 9, which does not provide so much of the output voltage, is necessary, is that is fulfils an important function with respect to the external induction magnetic flux.
  • the external magnetic flux enters the pole pieces 3 and 4 in the same quantity and in the same direction, so that the same output voltage is generated in the coil 10 and the coil 9, but these coils are wound in the opposite directions and therefore those output voltages cancel each other and the some of these voltages of both coils is zero.
  • Vibrator 12 moves perpendicularly to the surface of pole piece 3, and thus moves parallel to the surface of pole piece I at a constant distance from the latter, so that a variation of magnetic flux does not arise in pole piece 1 which does not generate an output voltage. Cancellation of external magnetism occurs in the same manner as stated. When the needle point traces the groove on the outside, the function and operation are reversed with respect to the function and operation thus described.
  • An electromagnetic pickup cartridge comprising, in combination, a needle support mounted for vibration in accordance with sound tracks on a record engaged by a needle mounted in said support; a magnetized armature carried by and extending from said support; two pairs of pole pieces arranged in spaced parallel relation, with each pair of pole pieces including a first pole piece and a second pole piece interconnected by a respective magnetic coil holder; only each first pole piece having a pole face at one end in spaced magnetic relation with said armature, said pole faces extending in perpendicular facing relation to each other; said armature being operatively associated with only said pole faces and terminating short of said second pole pieces; and respective coils embracing each of said pole pieces, the coils on each second pole piece being wound reversely with respect to the coil n the associated first pole piece and connected in series therewith; whereby external magnetic fluxes are cancelled with respect to each channel including a first and second pole piece, so that high fidelity reproduction is provided in all channels of the record only by said first pole pieces and the coils thereon in accordance
  • An electromagnetic pickup cartridge as claimed in claim 1, including a vertical compensation plate of mu-metal positioned adjacent said pole faces and said armature.
  • each magnetic coil holder comprising a substantially rectangular base and a pair of arms extending upwardly from an outer edge of said base and each juxtaposed with a respective first and second pole piece, said bases being substantially coplanar with their inner edges in adjacent spaced relation; said pole faces comprising bent ends of said first pole pieces bent inwardly toward each other to define an opened vee having an included angle of and said armature intersecting perpendicularly the triangle defined by said pole faces.
  • An electromagnetic pickup cartridge as claimed in claim 1, in which said support comprises a first lightweight tubular member of non-ferrous metal supporting the needle, and a second tubular armature of ferrous metal supporting said first member and positioned adjacent said pole faces.
  • An electromagnetic pickup cartridge as claimed in claim 4, including a permanent magnet in operative relation with said armature to magnetize the latter.
  • An electromagnetic pickup cartridge as claimed in claim 4, including tension means connected to the inner end of said armature and controlling the fulcrum point thereof.
  • An electromagnetic pickup cartridge as claimed in claim 4, in which said armature is a permanent magnet.
  • An electromagnetic pickup cartridge as claimed in claim 1, including a cartridge case mounting said pole pieces and said magnetic coil holders; and a needle case mounting said support; said cartridge case and said needle case being formed with interfitting configurations whereby the two cases may be readily engaged with each other and disengaged from each other.

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  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
US39613A 1969-05-23 1970-05-22 Cartridge for pickup Expired - Lifetime US3665123A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP4714969 1969-05-23
JP3319170A JPS514642B1 (enrdf_load_stackoverflow) 1970-04-18 1970-04-18

Publications (1)

Publication Number Publication Date
US3665123A true US3665123A (en) 1972-05-23

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Application Number Title Priority Date Filing Date
US39613A Expired - Lifetime US3665123A (en) 1969-05-23 1970-05-22 Cartridge for pickup

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US (1) US3665123A (enrdf_load_stackoverflow)
DE (1) DE2024876A1 (enrdf_load_stackoverflow)
FR (1) FR2044814B1 (enrdf_load_stackoverflow)
NL (1) NL7007480A (enrdf_load_stackoverflow)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4072823A (en) * 1975-06-06 1978-02-07 Kabushiki Kaisha Mitachi Onkyo Seisakusho Moving magnet pickup cartridge
US4161631A (en) * 1974-12-13 1979-07-17 Nippon Columbia Kabushikikaisha Pickup cartridge
US4237347A (en) * 1977-03-14 1980-12-02 Burundukov Valentin M Electrodynamic transducer with longitudinally moving magnet
US20080074083A1 (en) * 2006-06-26 2008-03-27 Yarger Eric J System and method for storing energy
US20090295253A1 (en) * 2006-06-26 2009-12-03 Battelle Energy Alliance, Llc Motor/generator
US20090295520A1 (en) * 2006-06-26 2009-12-03 Battelle Energy Alliance, Llc Magnetic structure
US20100013345A1 (en) * 2006-06-26 2010-01-21 Battelle Energy Alliance, Llc Bi-metal coil

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH404226A (fr) * 1962-11-27 1965-12-15 Oliver Stanton Walter Transducteur électromécanique

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4161631A (en) * 1974-12-13 1979-07-17 Nippon Columbia Kabushikikaisha Pickup cartridge
US4072823A (en) * 1975-06-06 1978-02-07 Kabushiki Kaisha Mitachi Onkyo Seisakusho Moving magnet pickup cartridge
US4237347A (en) * 1977-03-14 1980-12-02 Burundukov Valentin M Electrodynamic transducer with longitudinally moving magnet
US20080074083A1 (en) * 2006-06-26 2008-03-27 Yarger Eric J System and method for storing energy
US20090295253A1 (en) * 2006-06-26 2009-12-03 Battelle Energy Alliance, Llc Motor/generator
US20090295520A1 (en) * 2006-06-26 2009-12-03 Battelle Energy Alliance, Llc Magnetic structure
US20100013345A1 (en) * 2006-06-26 2010-01-21 Battelle Energy Alliance, Llc Bi-metal coil
US7688036B2 (en) 2006-06-26 2010-03-30 Battelle Energy Alliance, Llc System and method for storing energy

Also Published As

Publication number Publication date
DE2024876A1 (de) 1971-11-11
NL7007480A (enrdf_load_stackoverflow) 1970-11-25
FR2044814A1 (enrdf_load_stackoverflow) 1971-02-26
FR2044814B1 (enrdf_load_stackoverflow) 1973-10-19

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