EP0009818A1 - Dynamischer Tonabnehmerkopf für einen Plattenspieler - Google Patents

Dynamischer Tonabnehmerkopf für einen Plattenspieler Download PDF

Info

Publication number
EP0009818A1
EP0009818A1 EP79103819A EP79103819A EP0009818A1 EP 0009818 A1 EP0009818 A1 EP 0009818A1 EP 79103819 A EP79103819 A EP 79103819A EP 79103819 A EP79103819 A EP 79103819A EP 0009818 A1 EP0009818 A1 EP 0009818A1
Authority
EP
European Patent Office
Prior art keywords
needle
housing
needle assembly
pickup head
coils
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.)
Ceased
Application number
EP79103819A
Other languages
German (de)
English (en)
French (fr)
Inventor
Kimiyasu Honma
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.)
Audio Technica KK
Original Assignee
Audio Technica KK
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 Audio Technica KK filed Critical Audio Technica KK
Publication of EP0009818A1 publication Critical patent/EP0009818A1/de
Ceased legal-status Critical Current

Links

Images

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
    • 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

Definitions

  • the invention relates to a dynamic pickup head, ie with a moving spool, for a turntable, with a pickup body and a needle assembly which is detachably mounted on this body, and to a needle assembly as a removable part of the pickup head.
  • a classic turntable pickup head with a moving coil (GB-PS 1 000 035), two coils are arranged at right angles to one another on a square armature made of magnetic material. These coils lie in magnetic gaps, which are delimited by two pole shoes extending from the ends of a permanent magnet, so that a signal voltage is induced in the coils in accordance with the oscillation of the armature.
  • a cross-shaped armature is also known (US Pat. No. 3,299,219), on which two coils are arranged in a cross shape.
  • a moving coil pickup head is also known (US Pat. No. 3,679,843) in which replacement of the needle assembly when the needle tip is worn is facilitated.
  • the body of the pickup head has a flat bottom surface, at one end of which a downwardly projecting terminal plate is formed.
  • a plurality of contact pins sit on the terminal plate, which extend through them and project with their opposite ends on the opposite sides of the terminal plate so that their axes are parallel to the bottom surface.
  • the needle assembly has a flat upper side and furthermore has a side surface in which there are a plurality of contact sockets, in each of which one of the contact pins can engage.
  • the needle assembly By moving the needle assembly so that its upper side slides along the bottom surface of the body and engages or disengages the contact sockets at one end of the contact pins connected to the bottom, the needle assembly can be made easily removable with respect to the body be.
  • a permanent magnet is attached to the body with two pole faces that are exposed through the bottom surface, while the needle assembly has two pole pieces or yokes, the respective end of which is exposed through the upper side of the needle assembly, so that it comes into contact with the corresponding pole face when the needle assembly is properly attached to the body.
  • the needle assembly is held in place both by magnetic attraction to the underside of the cartridge head body and by the engagement of the contact pins in the contact sockets.
  • the other ends of the yokes are arranged so that a given Ab therebetween to determine an interposed magnetic gap stood lies.
  • the needle assembly includes an armature which carries two coils and is carried by the other end of one of the yokes, the two coils being arranged together with the armature within the magnetic gap.
  • the path of the magnetic flux runs from one pole face of the permanent magnet on the body via one of the yokes, the armature arranged in the magnetic gap and the other of the yokes of the needle assembly to the other pole face of the permanent magnet on the body.
  • the needle assembly is replaced and removed when the needle tip is worn, although the assembly contains the yokes made of relatively expensive material and therefore cannot be provided cheaply.
  • Another problem is increased magnetic loss due to the channel length of the magnetic circuit that extends from the permanent magnet on the body to the yokes of the needle assembly.
  • the fixed assembly of the needle assembly on the body is problematic since the body and the needle assembly are kept in contact with one another along flat surfaces and are connected to one another only by the engagement of the contact pins in the contact bushings.
  • the invention is intended to provide, in particular, a stereophonic pick-up head with a moving coil, with a pick-up head body and a needle assembly which can be easily and removably mounted on the body, with an anchor of the two being attached to the body when the needle assembly is mounted Coil-bearing needle assembly is properly placed in the magnetic columns.
  • the pickup head body has a permanent magnet and two pole shoes, between the ends of which there are magnetic gaps into which the armature of the Needle assembly is introduced immediately, so that the need for the presence of the yokes in the needle assembly is eliminated and thus the loss resulting from this construction in the magnetic circuit is minimized.
  • the magnetic gaps are limited solely by pole faces in the body.
  • the pickup head is constructed so that the body is a housing, a permanent magnet 3 fastened in the housing.
  • two pole pieces connected to the permanent magnet and held in the housing, one end of one of the pole pieces together with the other end of the other pole piece defining a magnetic gap which is open to the lower surface of the housing, and a plurality of electrical contact pins which are connected to the housing are connected and one end of which protrudes outward through one side of the housing and the other end protrudes outward through the lower surface of the housing;
  • the needle assembly includes a plug body, a plurality of electrical connector parts secured in the plug body for releasably engaging the other end of the contact pins, a needle subassembly carried by the plug body and a needle carrier arm having a needle tip at one end carries and from the other end an anchor is carried, which in turn carries two coils and has means for connecting the end of the coil to the connector parts; and that these other ends of the contact pins and the connector parts are aligned in a plane which
  • the needle assembly can be fixedly mounted on the body of the pickup head using a detachable construction known from US Pat. No. 3,761,647.
  • the body is provided with a socket which opens into its underside and extends in a direction perpendicular to the axis of the needle carrier arm, while the button-like plug-in part of the needle assembly is provided with a columnar part which engages in the socket.
  • the armature is made of synthetic resin in the form of a disk and carries two independent rods made of magnetic material, which extend from the armature upwards in the manner of horns and are arranged around the two coils.
  • the axis of each rod has an angle of inclination of 45 ° relative to an imaginary vertical plane which contains the axis of the needle carrier, a right angle being included between the axes of the two rods.
  • an armature of the type known per se from US Pat. No. 3,679,843 made of magnetic material can also be used, which has an annular part and two legs, on each of which a coil is placed.
  • a dynamic turntable pickup head that is to say one with a moving coil, has a pickup head body 1 mounted on the tonearm and a needle assembly 2 easily detachably mounted on the body 1.
  • the body 1 comprises a housing 3, which is pressed from synthetic resin and to which a partition 4 belongs, in which a downward opening is formed.
  • a plate-shaped permanent magnet 5 and two pole shoes 6, each of which adjoins one of the poles of the magnet 5, are firmly held in the opening.
  • the lower end of the pole shoes 6 extends further than the corresponding end of the permanent magnet 5, so that a magnetic gap 7 is formed between the pole shoes 6.
  • the end of each pole piece 6 is shaped in the manner shown in FIG. 3 with two triangular legs 8. Each of the magnetic gaps 7 lies between one leg 8 of one pole piece 6 and the corresponding leg of the other pole piece.
  • the permanent magnet 5 and the two pole shoes 6 together form a magnet assembly.
  • the housing 3 is formed with a plug-in socket 9 of increased size, which connects to the magnet assembly and has an opening on the lower surface of the housing.
  • the version 9 in the in Fig. 6 arrangement shown opposite side walls 10, in which four L-shaped electrical contact pins 11, of which only two are visible in the drawing, are embedded, namely two contact pins per side wall.
  • One end 11a of the contact pins 11 protrudes through the rear wall 12 of the housing 3, while the other end 11b protrudes through the underside of the housing 3.
  • the housing 3 also has two mounting flanges 13, by means of which the cartridge body 1 can be mounted on the tonearm.
  • the ends 11a of the respective contact pins 11 are electrically connected to terminals, not shown, on the tonearm when the body 1 is mounted on the tonearm.
  • the needle assembly 2 includes a button-like or knob-like plug body 14, which can also be seen in FIG. 2, with a bottom wall 15 and two side walls 16.
  • the bottom wall 15 has a columnar part 17 which projects upwards and is dimensioned in this way is that it can be inserted into the socket 9 formed in the housing 3, and which has two sections 19, 20 separated by a slot 18, as can be seen in FIG. 5.
  • the needle assembly 2 is detachably mounted on the body 1 in that the columnar part 17 of the plug body 14 is inserted into the socket 9.
  • the section 19 is resilient and is bent by a wall 21 of the socket 9 when it is inserted into the socket, in order to achieve a locking mechanism which is explained below.
  • the wall 21 of the socket 9 is provided with a small projection 22 which can engage in a recess 23 in the section 19 of the columnar part 17 and, when the columnar part 17 is inserted into the socket, in the recess 23 snaps into place.
  • the bottom wall 15 of the plug-in body 14 is equipped with a raised part 24 which connects to the columnar part 17 and through which and through the columnar part 17 a bore 25 extends into which a needle Sub-group 28 used and held therein by a locking screw 27 which is screwed into a threaded bore 26 extending perpendicular to the axis of the bore 25.
  • each of the contact sockets 29 there are four leaf-shaped electrical contact sockets 29 in the bottom wall 15 of the plug-in body 14, namely two each on the opposite sides of the columnar part 17. Only two contact sockets are visible in the drawing. These contact sockets are firmly inserted into bores 30 in the bottom wall 15, one end of which is located on the upper side of the bottom wall 15 and can therefore be plugged together with the end 11b of the associated contact pins 11 when the needle assembly 2 is on Body 1 is mounted. At the other end 29a, the metal sheet of each of the contact sockets 29 protrudes slightly into a cavity 31 which is formed on the opposite side of the bottom wall 15. This cavity 31 is sealed off by a base plate 32 which is connected to the plug body 14.
  • the needle subassembly 28 which according to the figure comprises a needle carrier arm 33 which carries a needle tip 34 at its free end. At the other end of the arm 33 there is an armature 35 made of synthetic resin.
  • Two independent rods 36 (FIG. 4) made of magnetic material are held at one end on the armature 35 and protrude from it like a horn.
  • One of two coils 37 sits on the rods 36.
  • the components 33 to 37 together form a vibrator unit which is movably supported by a support structure including a damper 38 made of elastic material and a mounting member 39.
  • the support mechanism comprises a flexible suspension rod, one end of which is connected to the other end of the needle carrier arm 33 or the armature 35 and which connects to the mounting member at the other end thereof the damper 3ö extends.
  • the needle sub-group 2ö is attached to the plug body 14 in that the mounting member 39 is inserted into the hole 25 formed in the plug body 14 and clamped with the locking screw 27.
  • openings 42 and 43 are in the bottom wall 15 of the plug-in body 14 and in the bottom plate 32 (FIGS. 2, 5). formed, through which the needle carrier arm 33 can pass.
  • the ends of the two coils 37 are connected to the other ends 29a of the leaves of the contact sockets 29, which are seated in the plug body 14, with the aid of lead wires 40.
  • Each lead wire 40 runs along the lower surface of the bottom wall 15 and is fastened in its central part to this lower surface with the aid of an adhesive tape 41 (FIG. 2). This is useful in that it avoids voltage noise that would otherwise be generated by vibrations of the lead wires.
  • the two rods 36 mounted on the armature 35 lie on the opposite sides of an imaginary vertical plane, which contains the axis of the needle carrier arm 33, and each take an inclination angle of 45 ° with respect to this vertical plane, so that between the Axes of the two rods form an angle of 90 ° and their position corresponds to the two modulated walls of a clay groove of a stereophonic record.
  • the axes of the rods 36 also lie in an imaginary plane which is at right angles to the axis of the needle carrier arm 33.
  • One of the properties of the pickup head according to the invention is that when the needle assembly 2 is mounted on the body, the two coils 37 carried by the armature 35 of the needle assembly 2 lie correctly within the magnetic gaps 7 that lie between the two toward the body 1 belonging pole pieces 6 and are limited by these. To achieve this result, the two pole shoes 6 are arranged in a plane that is perpendicular to the axis of the needle carrier arm 33.
  • the plug body 14 of the needle assembly 2 is manually held in place and its columnar part 17 is inserted into the socket 9 formed in the housing 3, as a result of which the needle assembly 2 is firmly mounted on the body 1.
  • a frictional engagement is produced between the socket 9 and the columnar part 17, while the projection 22 formed in the wall of the socket 9 snaps into the recess 23 in the columnar part 17.
  • the electrical contact pins 11 of the body 1 engage in the corresponding electrical contact sockets 29 of the needle assembly 2.
  • a frictional engagement is produced between the opposite side walls 16 of the plug body 14 and the opposite side walls 10 of the housing 3.
  • connection between the needle assembly 2 and the body 1, which is effected between the columnar part 17 and the socket 9, further between the pin ends 11a and the contact sockets 29 and between the side walls 16 and 10 ensures a firm engagement between the parts .
  • the multiple hold is not required to carry out the invention, but the needle assembly 2 can also be connected to the body 1 only by the engagement between the contact pins 11 and the contact sockets 29.
  • the coils 37 of the needle component 2 are properly arranged in the magnetic gaps 7 delimited by the two pole shoes 6.
  • Each of the coils 37 shows a high conversion efficiency because they are in a gap of increased flux density is arranged, which occurs between the triangular legs 8 at the ends of the oppositely arranged pole shoes 6.
  • the operation results in the from U.S. Patents 3,720,769 and 4,075,418 known manner and is therefore not described in more detail.
  • the operation is characterized in that, if only one of the channels of the groove in the record is modulated, one of the rods corresponding to that channel will oscillate on its own, while the other rod will only rotate about its own axis . However, if both channels are modulated, the two rods are subjected to a corresponding oscillation, which is proportional to the modulation of the assigned channel.
  • each of the rods 36 oscillates, and the magnetic flux passing axially through the rods causes a voltage to be induced on the respectively associated coil 37 seated on the rod. Since the two rods 36 are independent of one another, the magnetic flux occurring in one of the rods 36 does not also pass over the other rod, thereby preventing crosstalk or noise from being generated in the coil arranged on the other rod.
  • the construction described can be modified in various ways within the scope of the invention while maintaining the effects achieved by the invention.
  • the two coils can also be arranged on two legs, which extend away from an annular armature made of magnetic material.

Landscapes

  • Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Moving Of Heads (AREA)
  • Reciprocating, Oscillating Or Vibrating Motors (AREA)
EP79103819A 1978-10-06 1979-10-05 Dynamischer Tonabnehmerkopf für einen Plattenspieler Ceased EP0009818A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP123396/78 1978-10-06
JP12339678A JPS5550800A (en) 1978-10-06 1978-10-06 Movable coil type pick up cartridge

Publications (1)

Publication Number Publication Date
EP0009818A1 true EP0009818A1 (de) 1980-04-16

Family

ID=14859518

Family Applications (1)

Application Number Title Priority Date Filing Date
EP79103819A Ceased EP0009818A1 (de) 1978-10-06 1979-10-05 Dynamischer Tonabnehmerkopf für einen Plattenspieler

Country Status (4)

Country Link
US (1) US4364120A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
EP (1) EP0009818A1 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
JP (1) JPS5550800A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
CA (1) CA1139234A (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5864198U (ja) * 1981-10-23 1983-04-30 株式会社オ−デイオテクニカ 可動コイル型ピツクアツプカ−トリツジ
US4558443A (en) * 1982-09-23 1985-12-10 Tekudaiya Kabushiki Kaisha Moving coil type pickup cartridge

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3679843A (en) * 1970-12-23 1972-07-25 Micro Seiki Co Ltd Moving coil type phonograph pickup cartridge
US4075418A (en) * 1968-08-14 1978-02-21 Kabushiki Kaisha Audio-Technica Stereophonic pickup cartridge
JPS5377601A (en) * 1976-12-21 1978-07-10 Audio Technica Kk Transducer
DE2830801A1 (de) * 1977-07-13 1979-01-18 Victor Company Of Japan Stereo-tonabnehmer vom schwingspulentyp

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2639156A (en) * 1949-10-29 1953-05-19 Gen Electric Double-twist phonograph stylus assembly
GB930366A (en) * 1958-11-10 1963-07-03 Bang & Olufsen Produktionssels Stereophonic pick-up having a single stylus
DK124049B (da) * 1969-03-25 1972-09-04 Fonofilm Ind As Magnetisk pick-up.
DE2115122C3 (de) * 1971-03-29 1974-01-24 Dual Gebr. Steidinger, 7742 St. Georgen Magnetischer Tonabnehmer
DE2230203C2 (de) * 1972-06-21 1974-07-04 Electroacustic Gmbh, 2300 Kiel Elektromagnetischer Tonabnehmer, vorzugsweise zur Wiedergabe von quadrofonischen Schallaufnahmen
JPS5210105A (en) * 1975-07-15 1977-01-26 Kenkichi Tsukamoto Moving coild cartidge
JPS5290903A (en) * 1976-01-24 1977-07-30 Susumu Shiyouji Pickup cartridge
US4205856A (en) * 1977-08-11 1980-06-03 Stax Industries Limited Pickup cartridge
JPS5448503A (en) * 1977-09-01 1979-04-17 Matsushita Electric Ind Co Ltd Moving coil type pickup cartridge

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4075418A (en) * 1968-08-14 1978-02-21 Kabushiki Kaisha Audio-Technica Stereophonic pickup cartridge
US3679843A (en) * 1970-12-23 1972-07-25 Micro Seiki Co Ltd Moving coil type phonograph pickup cartridge
JPS5377601A (en) * 1976-12-21 1978-07-10 Audio Technica Kk Transducer
DE2830801A1 (de) * 1977-07-13 1979-01-18 Victor Company Of Japan Stereo-tonabnehmer vom schwingspulentyp

Also Published As

Publication number Publication date
US4364120A (en) 1982-12-14
JPS6111036B2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html) 1986-04-01
CA1139234A (en) 1983-01-11
JPS5550800A (en) 1980-04-12

Similar Documents

Publication Publication Date Title
DE60115995T2 (de) Adapter zum Verbinden einer Vielzahl optischer Stecker
DE3788029T2 (de) Verbindungssystem für elektrische schaltungen.
DE69116000T2 (de) Verbinder für Flachkabel mit mehreren Leitern
DE60025552T2 (de) Koaxiales Relais
DE60202820T2 (de) Anschlussvorrichtung eines Resolvers
DE1941569C3 (de) Elektromagnetischer Mehrkanal-Tonabnehmer
DE3007822A1 (de) Magnetblasenvorrichtung
DE1917075C3 (de) Elektrischer Stecker
DE2748655C2 (de) Haltevorrichtung für eine Kathodenstrahlröhre
DE3224064C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE2063625A1 (de) Schwingspulen-Tonabnehmereinsatz
EP0495778B1 (de) Filter-steckverbinder
DE2802713B2 (de) Summer
DE69712540T2 (de) Objektivantriebsvorrichtung und Verfahren zu ihrer Herstellung
EP0009818A1 (de) Dynamischer Tonabnehmerkopf für einen Plattenspieler
DE1948636B2 (de) Mehrspurmagnetkopfanordnung
CH689526A5 (de) Sockelteil eines elektromagnetischen Schaltgeraetes, insbesondere eines Schuetzes.
DE1833796U (de) Tonabnehmer mit auswechselbarer nadeleinheit.
DE2159573A1 (de) Magnetischer Stereo-Tonabnehmer
DE69323473T2 (de) Gerät mit drehbarem Magnetkopf und Verbindungsstück zur Konstruktion des Gerätes
DE6607308U (de) Schalterzusammenbau mit einer kontaktverbindung zu einer gedruckten schaltung
DE2837466C2 (GUID-C5D7CC26-194C-43D0-91A1-9AE8C70A9BFF.html)
DE2024876A1 (de) Tonabnehmersystem
DE69022658T2 (de) Verbinder-Anordnung für elektronische Vorrichtungen.
DE102016107996A1 (de) Steckervorrichtung

Legal Events

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

Free format text: ORIGINAL CODE: 0009012

AK Designated contracting states

Designated state(s): CH DE FR GB IT NL SE

17P Request for examination filed
STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION HAS BEEN REFUSED

18R Application refused

Effective date: 19830604

RIN1 Information on inventor provided before grant (corrected)

Inventor name: HONMA, KIMIYASU