DE1422539A1 - Electromechanical converter - Google Patents

Description

PATENT LAWYERS

DR.-ING. H. FINCKE
DIPL.-ING. Π. -.EAR
DIPL-ING. Ü. i ^<: > ΖΊ

M 5098 St / S Munich, November 27, 1962

Müllerstrasse »21

description

to the patent application of Mr. Walter Oliver Stanton, Laurel Hollow, State of Mew York, V.St.A.

regarding "electromechanical converter"

The invention relates generally to sound reproducing apparatus and, more particularly, to an improved phonograph pickup of the magnetic type for use for stereophonic playback from the sound groove of a record.

In the case of stereophonic reproduction of sound, at least there will be two speakers placed separately from each other are used, so that when the speakers are excited, the listener has the impression gets that the sound is emitted from different places. When a 3hall plate is used as an information carrier it must be seen especially for such stereophonic! systems be cut, since this system is a two-channel system and the information is fed to the individual loudspeakers from a single soundboard groove, whereby the System determines which parts of the information reach each of the loudspeakers.

The stereophonic systems used today record the information in the record in the form of a V-shaped groove,

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as they are in FIg. 1 is shown, which has such a groove in the transverse

cut rises. Rectangular coordinates are provided »the are marked with A and B and the overeln in Plg.l in the hat » other, each: these axes at 45 ° from the vertical is inclined and at right angles on each one rare. surface of the groove and parallel to the other side surface.

In this system the tone intended for one loudspeaker is determined by changing the position of one side of the groove along the axis normal to that, and the tone for the second loudspeaker is determined by changing the position of the other side of the groove along that normal axis Axis determined. In Pig.1, side A * is at position -2 of the A-axis and side B * is at position -2 of the B-axis. The point (-2 «-2} denotes the current position of the follower pen®® in this groove. In Fig. 2, the rare area A * is at the point -1 on the A-axis and the side B ⁹ at the point - 2 on the axis B. The point (-1, -2) denotes a second instantaneous position of the follower pen in the groove.

In the groove of Fig. 2, the position of the follower pin®® is through a sound reproduction device evaluated, usually by means of a mechanical system that is in the pickup head is housed to one of the speakers in überelnstimmuQg with the component of movement along the A axis in direction

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to side A * or away from it. The other Loudspeaker is energized according to the movement component of the abdomen along axis B.

A second scanning system commonly used today for playback «stereo * Phonic sounds consists of a record cut with one Groove which is substantially V-shaped with the information cut along axes, for example the axes mentioned above A and B. In this second system, however, the axis A lies perpendicular to the vertical and the axis B perpendicular to the horizontal. In other words, the axes are on this one The system is rotated by 45 ° around the zero point. Here the Information stored in a record is sampled in the same way as in the first system, with the difference “that the movements of the stylus happen vertically and horizontally «

The invention is essentially concerned with the first system, which is referred to below as the V-Rlllen system. VIe however from the following description and in particular from the example description, the pickup can according to the Invention can also be modified so that it is aioh suitable for the second system, which as a side-vertical Syaten is referred to, or for a similar system in which the

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Coordinates of the SchalXrIHe are twisted.

The invention is based on the object of a stereophonic! To create a pickup that is used in stereophonic systems Can be used with vinyl records that have V-shaped grooves and that is easy to use on vinyl records can be changed, the rare vertical wheels aifwelsen, or the one for such records whose grooves have other systems with twisted axes.

The pickup according to the invention uses an improved one Suspension of the anchor carrying the tracer pin »which one Movement of the anchor with minimal effort in all Allows the necessary directions and which keeps the anchor in a neutral position when not in use. It is also an improved magnetic coupling member provided * which allows the use of a low mass anchor, so that minimal plate wear is achieved.

The stereophonic pickup according to the invention is relatively simple, insensitive, of strong construction, can be produced economically and has a long service life.

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A replaceable stylus unit can also be provided « which enables the replacement of the stylus and associated parts after wear or damage and that contains most of the expensive and tightly toleranced parts in the cartridge, so that the replaceable stylus assembly relatively light and can be replaced cheaply.

Oemäaa the invention can be a stereophonic pickup produce! its magnetic source, pole pieces and coils in one molten plastic are embedded, so that no relative movement or Vlbration occurs between these parts can · The wire connections can be melted down at the same time during the production of the pickup, so that the electrical Connections and circuits are effectively protected against moisture and corrosion, whereas the moving parts · «dl« subject to wear and tear, mounted on a replaceable scanner assembly, and forming an essentially permanent assembly.

The invention is illustrated below with reference to schematic drawings additionally described in several execution examples.

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Fig.l is a view of a record groove with right-angled, superimposed coordinates indicating a position of the stylus in the groove; Fig. 5 is a view similar to Fig. 1, which shows a different position of the follower pin in the groove

Flg.? Figure 3 is a simplified perspective view of a stereophonic pickup according to the invention, from the the design of the poles and the armature as well as the attachment d @ s Anchors can be seen;

4 shows a perspective view of the anchor 1st and sample "pin for the device according to Fig, 25, with portions of the bracket are broken to the type de? To show support of the anchor in the bracket;

Fig. 5 is a partial perspective view of another Embodiment of the invention seen from the bottom, showing the construction of the poles and the armature support;

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Fig.6 is a side sectional view of the one shown in Fig.5 Device in a partially opened state to fix the anchor bracket to show better;

Flg.7 is a partial cross-section of the anchor and the anchor bracket for the device vegetables Fig.5;

FIG. 8 is a partial perspective view of another anchor holder for the device according to FIG. 5;

Fig.9 is a side view of the anchor bracket shown in Fig.8}

Fig. 10 is a partial view of another embodiment genes of the invention in which other corapenaation devices are used;

Fig.11 is a side view of the one shown in Fig.10 Design type;

Fig. 12 is a side view of a stereophonic pickup device according to the invention "incorporated into a toner";

Fig.IJ is an exploded perspective view of a stereophonic! see pickups for playing back pages;

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Fig. 14 is a simplified perspective Tellaneloht a ·· stereophonic pickup * the eo is modified that he sioh for records in rare vertical .Schnifctechnilc use IKsst;

Fig. 15 is an exploded perspective view a cartridge with the replaceable stylus assembly removed;

Fig. 16 is a simplified perspective view of the pole structure and the scanning unit of the pickup head according to FIG.

Fig.17 is a bottom view of the pickup head according to Flg. Figure 15 showing the fixed and detachable structural units assembled;

Fig.l8 is a side view of a Tonahnehaerkopfee gemKee Fig. 17?

Fig. 20 is an exploded perspective view of parts of the stylus assembly according to Figure 17 in the view from below;

♦)? Ig "19 is a front view of the onabnebmerkopfss according to

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Pig. 21 is an exploded perspective view of parts of the stylus assembly vegetable Pig, 20 in FIG Bottom view showing the magnetic coupling part and the retaining channel;

Pig. 22 is an enlarged longitudinal cross-section along the line 22-22 of Pig. 17;

Figure 2J · 1st vergrSsserter a cross-section along the line 23-25 of Fig.17 t

Fig. 24 is a bottom arrangement of another embodiment an exchangeable stylus unit for use with the cartridge head Genäss Pig. 15ϊ

Pig. 25 is a line taken along line 25-25 of Fig. 24j

Fig. 26 is a perspective view of a pole piece for Use for the scanning pen assembly according to Fig. 24 in the Top view and

Flg.27 let a perspective view of a Poltellee for Use with the tracer pen unit according to Pig. 24 from below.

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Pig. 3 shows the pole structure of a stereo pickup according to the Invention "which is generally referred to as the reference slide 30. The pole structure mainly comprises a substantially square main plate 31 with an underside JIa on which dl upper ends of cores 38, 33, 34 and 35 are attached · Di · Cores are attached to the underside of the main plate in such a way that the core is arranged at each corner of the main plate and extends downward from this. The main plate * and the cores are made of a magnetically highly permeable material made, e.g. from soft iron or a Niok «! iron alloy or similar suitable magnetic material, and each solid and cylindrically shaped core forms the core of a electric coil wound around it. The coils 36, 37 * 38 and 39 each surround the cores 32,33 * 34 respectively. 35.

The lower end of each core has a pole face that is below is inclined at an angle of 45 ° to the horizontal «The cores 32,33,34 and 35 therefore have at their lower ends Pole surfaces 32a, 33a * 3 ** beaw. 35a, which are so inclined that the planes of surfaces 32a and 33a intersect at right angles above these surfaces. The same is the case with the Pole fleas 34a and 35a are the case.

The geometric arrangement of the pole faces and the orunds thereof is described below.

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Ba let also a pernanea magnet 40 of solid cylindrical shape Shape provided, the upper Bode to the bottom 31m adjoins the main plate and extends so far downwards that its lower end is approximately exactly as far from the underside 31a removed 1st how the lower sods of the coils

A holding part 41 is used to fasten the anchor, the uppermost foot of which lies next to the lower end of the permanent magnet 40 and that in the middle of a cylindrical opening 4la verse · » hen so that an armature 42 can look through this opening and into the field of a permanent magnet between opposite PolflKohen lies. The end 42a of the anchor * from which the stylus 43 extends, 1st between the Areas 34b and 35 located while that find 42b of the anchor lies between fleeing 32b and 33b.

The folding part 41 is made of an essentially solid, non-agnetic material. On the side winds of the cylindrical opening, a screen 44 made of some kind of foldable material such as Ounni is attached and surrounds part of the Anchor so that it is held and cannot rest against the holding part. The anchor is within opening 41 freely movable without touching the holding part, and the cover prevents undesired oscillations of the armature

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it forms a “damping”.

The designed as a hotolzyllndrisehee part anchor 42 let βο arranged that its ends 42a and 42b are equal in length extend from the bezel. The anchor consists of a magnetic element of high permeability and a small heluctan * (magnetic resistance), so that between the middle part and at one end there is a low magnetic voltage drop. A needle made of precious stone or any other suitable material has been used.

The retainer 41 and the shutter 44 normally hold the armature 42 in a neutral position when there is no force on the Stylus 43 is exercised. Is in this neutral position the anchor end 42a equidistant from the surfaces 34b and 35b and anchor end 42b equidistant from surfaces 32b and 3Jb.

This arrangement has four different magnetic paths on. The magnetic path includes the upper end of the permanent magnet 40, the main plate 31, the coil core 35, the poIf area 35 *, the armature end 42a and the lower end of the permanent magnet.

The second magnetic path encompasses the upper end of the permanent magnet 40, the main plate 31 ″, the coil core 32 ″

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Pole 32a, the armature end 42b and the lower end of the permanent magnet.

A third magnetic path comprises the upper end of the permanent magnet, the main plate 31 * the coil core 3 * "the PoI-FlMohe 34a", the armature end 42a and the lower band of the permanent magnet.

A fourth magnetic path comprises the upper end of the permanent magnet, the main plate 31 »the core 33» the poles. 33a, the armature end 42b and the lower band of the permanent magnet "

Each of these magnetic paths absorbs a magnetic flux » which emanates from the permanent magnet and has an air gap between the armature and the corresponding pole If the air gap represents a very high magnetic resistance for the magnetic flux, a change in the air gap in each of the magnetic paths causes a considerable change Change in the amount of magnetic flux in the paths concerned.

Considered «at a.B. the above mentioned first magnetic path " when the armature end 42a is fixed, constant plus lines run in the magnetic path. However, if the anchor end 42a is moved at right angles to the pool area 35a «so

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If you see the air gap between the anchor end 42a and the Pole surface 35a, so that the magnetic resistance of the magnetic Leltungsweges is reduced and that flowing into it Magnetic flux increases «Sine such movement of the armature end causes the anchor end 42b to move away from the poI surface 32a continues so that the air gap in the second magnetic conduction path increases and causes the magnetic flux in this to decrease. The decrease in magnetic flux in the long line is roughly equal to the increase in magnetic plus in the first conduction path

The movement of the armature 42 normal to the poIf pools 35a and 32a cannot act on the third and fourth conduction path since the movement occurs parallel to the poIf pools 33a and 34 and no change in the air gaps in these routes to the pole Has. In the same way, a movement of the armature 42 normal to the pole surfaces 33a and 34atolne change in the magnetic flux effect in the first and second conduction path.

The change in the magnetic flux in the cores of the coils 36,37, 38 and 39 generate a voltage in these coils. When the armature end 42a moves against the pole face 35a and the armature end 42b against the pole face 32a, signals of opposite polarity are generated in the coils 36 and 39, with the amplitudes of these signals are the same when the coils have a

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have the same number of turns. The coils 36 and 39 are electrical connected to one another in such a way that the voltages induced in them add up to a single signal when the armature moves two individual signals. The coils 36 and 39 act as a pair * that on the movement of the armature 42 in Riohtung on the PoIf borrowed 55a and 32 or away from them, and the coils 57 and 38 act in the same way as a pair of coils to the movement of the armature 42 in alignment with the pole moorings 55a and 54a or away from these.

In Fig. 3 i * t with the reference numeral 45 denotes the signal induced in the coil 39, which is fed to an amplifier 46 » and the reference numeral 57 denotes that induced in the coil 36 Signal "which" is fed to the amplifier 46 · The signals induced in the coils are brought together in the pick-up head, in the amplifier or at a suitable point so that the signal coming from amplifier 46 to loudspeaker 48 is the same the sum of the amplitudes of those induced in coils 39 and 36 Signals 1st. Xn similar catfish can be found in the coils 38 and 37 generated signals are merged at a suitable point · In Pig.3 are the signals induced in these coils denoted by the reference numerals 49 and 50 and are fed to an amplifier 51, and the sum of their splits can be sent to one Loudspeaker 58 are guided.

Every change in the position of side B * in Plg.l and 2 lings the B-axis would move the stylus 43 and the

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Anchor 42 on the poles 55a and 32a in or away from them, this movement being perceived by the coils 39 and yS and delivering an audio frequency signal which arrives at the loudspeaker 48. Any change in the position of the eite ^ö A 'in the PIg.1 and 2 length of the A-axis would a movement of the follower pin 43 and the Ankere 42 in the direction of the PoIf laughing 34a 33a or from this away and cause "and this movement would are registered by the coils 38 and 37 and SU carry an audio frequency signal which arrives at the loudspeaker 32 "A stereophonic" sound can be sampled from a V-shaped groove with a pickup according to the invention.

It should also be noted that the device according to the invention Has hum-compensating properties «The coils 39 and are electrically connected together in such a way that the amplitudes with oppositely polar signals, as they arise when the armature moves, add. However, hum signals that occur in The coils 39 * 36 when external fields are induced have the same polarity, so that these signals cancel each other out. Tue « The same effect is achieved with the coils 37 and 38, so that the voltages induced in these coils duroh external fields cancel each other out. The coils are wound in such a way that they add the useful signals one behind the other and oppose the interference signals, e.g. hum signals due to Kusserer fields. are included.

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The Pig · 5 »6 and 7« have a different embodiment of the invention, and for a clearer illustration of the pole design and the armature support let the device in Pig · 5 seen from below · The pole assembly Is generally with the reference number 5? denotes and includes four Cores of essentially square or rectangular cross-section. Each coil core is made from a matching magnetic soleplate Material of high permeability made, e.g. from which bis, and is not given by one coil each, for which the pole parts are cores at the same time · The cores are nit the reference series 5 * · 55 » 56 and 57, and the coils surrounding these carry the reference sheets 58, 59, 60 respectively. 61.

Each core is inclined at its end at an angle so that the Pole surface forms an angle of 45 ° with respect to the horizontal. The poles 54a, 55a, 56a and 57a of the cores 54, 55 »56 esp. 57 are each inclined at an angle of 45 ° to the horizontal · The planes of the surfaces 54a and 57a intersect at right angles below the pole faces, as shown in Fig. 5. That the same applies to the pole areas 55a and 56a.

In the vegetable Pig.3 device, the pickup JO is nit a main plate Jl is provided to complete the magnetic paths.

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Such a plate can also be provided in the pickup device 53 , but it is preferably omitted if this should be desired. In the case of the pickup 53, every magnetic conduction path is completed via an air gap as far as the permanent magnet 62, which forms a solid cylindrical part, the end of which, located near the armature 63 , has a V-shaped groove. One side of the V-Püxtb has an angle of 45 ° with respect to the horizontal and the other ·: ¹ · side of the same also has the same angle with respect to the horizontal »so that the side surfaces of the V-Ausohnittes are at right angles to one another.

The holding channel 64 forms a channel made of sheet metal with a V-shaped cross-section, the side surfaces of this V-pora are oriented at right angles to each other and each form an angle of 45 ° with the horizontal. The V-groove made of any suitable non-magnetic material is arranged in the V-shaped groove of the permanent magnet, so that each side surface of the V-groove rests against the adjacent side surface of the V-groove of the magnet and the groove extends in the longitudinal direction so that it completely covers the pole faces. In this way, one side of the holding channel 64 lies next to one side of the V-shaped groove of the permanent magnet and also next to the pole faces 54a and 55a, while the other side of the retaining channel on the other side surface d «r V-shaped groove of the permanent magnet and the pole surfaces 56a and 57a is present. - 19 -

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The Balteil 6 * carries a magnetic coupling piece 65 * which also has a V-shaped cross-section and whose side faces are at right angles to each other and angles of 45 ° from the horizontal. The coupling position 65 is made of magnetic iron with high permeability and low « reluctance produced so that in this part one low magnetic voltage drop occurs. This part is arranged in the longitudinal direction inside the holding part 64. the Ends of the magnetic coupling end just before the pole parts, so that the pole faces of no part of the magnetic Coupling piece are covered.

One end of a retaining wire 66 is attached to the retaining channel 64, see B. by soldering o.dglo, in a place where the side faces intersect. This end of the wire extends upward through an opening in the magnetic Coupling part to hold the hollow cylindrical armature, which is made of a magnetically high permeability material with low reluctance is made, and to avoid contact with the clutch actuator 65. The holding wire is in place at the top end 66a soldered to the armature »The wire 66 forms a mechanically · Pedestal holder that allows an all-round movement of the anchor corresponding to the forces exerted on the follower pin 67

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enables "

The magnetic coupling part 65 enables the use of an extremely light armature, since it forms a conduction path » through which the magnetic flux flows over an extensive surface area and a considerable length of the armature in this can. As a result, the magnetic voltage drop in the armature is reduced, as is the crosstalk, as will be discussed further below is explained in more detail «

There are four flux paths in the type shown in Fig. 5. One of these natural conduction paths comprises the upper end of the permanent magnet 63, the magnetic coupling part 65, the armature 63, the pole face 5 ^ ia, the core 5k and the lower end of the permanent magnet 680

A second conduction path holds the upper end of the permanent magnet, the coupling part, the armature 65, the pole face 57a, the core 57 and the lower end of the magnet »

A third magnetic conduction path includes the top des Pei * manentKiagnefcen, the coupling part, the anchor 65, the Pole face 57a, the core 57 and the lower end of the magnet *

A fourth magnetic line comprises the upper end of the magnet 62, the coupling part 65, the armature 6j _t the pole face

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56a (not shown), the core 56 and the lower end dee Magnets 62a

The coils of the pick-up 53a are switched in the same way as the coils of the pick-up 30 "The coils

58 and 59 form a pair of coils and are corded together so that the movement of the armature in the Coils-induced voltages add up the movement of the armature 63 in the direction of the pole surfaces 54 and 55a or from these weg Induces signal voltages in the coils 58 and 59 of opposite polarity, the amplitudes of which are added and, after suitable amplification, fed to a loudspeaker. Even the coils 60 and 61 form a pair of coils and 3 are connected together in the same way. The movement of the armature 63 in Direction towards the pole faces 56a and 57a or away from them induces signal voltages in coils 60 and 61 of opposite polarity, the amplitudes of which are added and after suitable amplification are fed to a loudspeaker.

The above-mentioned hum-compensating property of the device according to FIG. 3 is also present in the embodiment just described, since the coils 58 and

59 are so together that they are caused by external disturbances voltages generated in coils 58 and 59 which are of the same polarity cancel each other out. Similar catfish stand out

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the signals in coils 60 and 6l generated by external signals originate on «

Pig, 8 and 9 show a modified mount for one Anchor of a pickup 53 ° With this modified bracket the retaining wire is soldered at one end to the retaining channel 64 and extends through an opening in the magnetic Coupling part 65. The upper end of the wire is soldered to the armature 63 as in the previously described device

In this modified type of holder, semicircular viscous damping points 68 and 69 of rectangular cross-section are used. The outermost edge or surface of each damping part is closest to the uppermost surface of the magnetic coupling part 65, and the inner peripheral surfaces of the semicircular damping parts are closest to part of the outer surface of the armature 63. The parts 68 and 69 are as close as possible to both sides of the retaining wire 66 and are wedged between the armature and the magnetic coupling part. In addition to the damping of the armature, the semicircular parts ensure that the armature 63 does not override the magnetic coupling position 65 and help the wire 66 to prevent the armature 63 from rotating about its own axis.

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As already mentioned above, this reduces the magnetic coupling position 65 a crosstalk by reducing the magnetism see voltage drop in the armature «The crosstalk is one Phenomenon that occurs when a fUv determines a channel Signal of a two-channel system a signal in the other channel generated, the desired signal being produced naturally in the desired channel. The magnetic coupling part With the device according to Fig. 5, the crosstalk (adjacent channel attenuation) is reduced considerably *

If the armature pivots towards a pole face as a result of the scanning movement, the magnetic resistance in this conduction path is reduced. Accordingly, a higher magnetic flux flows, with the result that the magnetic voltage drop in the armature is increased and that the other magnetic conduction paths which pass through the armature together aeigen a decrease in the magnetic flux, even if the air gap in this conductor carriage remains constant 0 The magnetic coupling λ.1, which conducts the magnetic signal from the permanent magnet to the armature, as close as possible to the pole faces, without directing it directly to the pole faces, compensates for the magnetic voltage drop. When the armature moves towards a pole face, he also moves in the direction of the coupling part, wo1ones is the source of magnetic flux. Since the ankc-s is "closer to the source of the magnetic flux," rgibfc is higher

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Magnetization, which increases the magnetic voltage drop compensated, so that thereby the crosstalk in the pickup is switched off »

Another device for compensation "which can be used with or without the trough-shaped magnetic coupling part of the type described above" is shown in FIGS. 10 and 11. The parts 70 and 71 here form two cores of a four-core system, as has already been described above. To dl · cores 70 and 71 are coils 74 arranged BEZW "75, while the cores (not shown) 72 and 73 of coils BESW 76th 77 (not shown) are surrounded.

A permanent magnet 78 is provided, the upper end of which is close to the anchor 79, and which carries the stylus 80 and is held in any suitable manner. This anchor is from same design as the anchors previously described.

In this embodiment, compensation is achieved in that the cores are provided with pole faces, the planes of which intersect at angles of more than 90 °. In Pig. IO form the pole face 70a of the core 70 and the PoIfloche 71a of the core 71 has a cutting angle A which is slightly greater than 90 ° · moving check the armature 79 closer to the air gap assumes the surface 71a * from this conductive path., Der / inker moves, however, see

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also a little closer to the pole face 70a, so that the increased Magnetic voltage drop in the armature 79 »which is due to the increased PIuB in the magnetic conduction path of the end face 71» results in its effect on the magnetic conduction path of the Pole face 70a is compensated and switched off * so that the crosstalk in this pickup device is essentially is turned off.

The pickup according to the invention may have a cartridge shape so that it can be attached to a tone arm. Fig. 12 shows a pickup arm 8l and a pickup cartridge 82, which is attached to this, and shows what OrUSe the pickup device has poor compared to the entire tone.

The teaching according to the invention can also be used when scanning information from stereo records, the grooves of which are cut in a system other than the 45 ° cutting technique. For use in the rare vertical system of the pickup has iie in Fig. Ik Polbauart shown. The pole structure of the pickup 87 comprises a permanent magnet 88 and cores 89, 90, 91 and 92. The cores are surrounded by coils 93, 94, 95 and 96 respectively.

The armature 97 is designed in the same way as the armature described above and is connected to a follower pin 98. Of the Anchor is held on some suitable catfish so that he

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in ßaioar neutral Stelling equidistant from the pole face 89 * de3 core 89 and dor foil surface 90a of grain 90 is removed. In the neutral position, the armature is also equidistant from the pole face 91a of the core 91 and the pole face 98a of the core 92 removed. The planes of the pole faces 89a and 90a are parallel to each other and at right angles to the horizontal, whereas dl Pole surfaces 91a and 92a lie in the same horizontal plane, which is perpendicular to the planes of the poles 89a and 90a »

There are four magnetic cable scales. The first conduction path comprises the upper region of the magnet 88, the core 89 "the pole face 89a", the armature 97 and the lower region of the magnet 88. The second conduction path comprises the upper region of the magnet 88, the core 90, the pole surface 90a , the armature 97 and d ei "n oh lower bar of the magnet 88. the third Leitungeweg comprises the upper portion of the magnet 88, the core 91, the PoIf laugh 91a, the armature 97 and the lower portion of the magnet 88. the fourth magnetic _O The conduction path includes the upper region of the magnet 88, the core 92, the pole face 92a, the armature 97 and the lower region of the magnet 88.

In this embodiment, the coils 92 and 94 form a closed the cores 89 and 90 belonging to the coil pair to detect lateral movements of the stylus 98, and the coils 95 and 96 form a coil pair assigned to cores 91 and 92,

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ma perceive the vertical movement of the stylus a

The vertical movement of the stylus 98 in the direction of the pole face 89, for example, results in a decrease in the magnetic resistance of the first magnetic conduction path, whereby the magnetic flux in this conduction path changes and generates a signal in the coil 93. This increases at the same time Moves the magnetic resistance in the second conduction path and generates a signal in the coil 94. The signals induced in the coils 93 and 94 have an equal amplitude and are antipolar. The coil 93 is connected to the coil 9k in such a way that the voltages generated in these coils during the movement of the emitter add up, so that a single signal results, the amplitude of which is twice as great as that of a single signal after appropriate amplification has been fed to a loudspeaker in order to generate a sound in accordance with the lateral changes in the plate groove.

This movement of the armature 97, which runs parallel to the pole faces 91a and 92, does not act on the third and fourth magnetic conduction path. Vertical changes in the groove are perceived by the coils 9i and 92, the third respectively. fourth magnetic conduction path associated with «The movement of the

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Follower pin 98 perpendicular to the pole surface 91a produces S3 · an increased magnetic flux in the third magnetic conduction path and a decrease in the magnetic flux in the fourth magnetic Lsi & inconsistent, so that two signals of the same amplitude but opposite sign induce in the coils 95 and 96 i; spöeno The amplitudes are added electrically, so that there is a single ε signal ₂ , which is fed to a loudspeaker and generates sounds according to the vertical changes in the record groove »

Also in this Ausführungsförra is a humbucking because exterior fields generate signals in the coils dl "dl · equal · polarity and essentially have the same Anplituden so tHe these signals cancel each other out and do not get to the speaker _o

The moving components of the pickup, for example the armature and the scanning pen unit, wear out over time, whereas the fixed components, e.g. The pole structure, see only little wear and tear and work satisfactorily over a long period of time, flg. 15 to 23 show an embodiment in which the sieve moving parts of the pickup are housed in a separate detachable Abtaetaggregftt, which removes or from the body of the pickup cartridge by simple sliding action can be inserted so that the scanning unit can be easily replaced

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If worn or damaged, the cartridge cannot be returned to the dealer or factory

Fig. 15 shows the pickup cartridge in a state in which the replaceable scanning unit 100 is fortgunoiraoen. The FTIR Tragcex'Uah the cartridge ± ut melted or poured and about from a suitable dielectric plastic or OieSharz as phenol resin, ureas, nylon and polystyrene. The support structure is manufactured according to a Sohmelz process, so that it encloses and supports several fixed parts of the pickup in a suitable manner and at the same time has a pleasant Xuderea, in the support structure 99, for example, the fast cylindrical cores 102, 103, 10 * and 105 (Fig. 16) and their coils 106 »107» 10 and 109 are arranged vertically with their axes arranged in parallel in the form of a square and each core lying at a corner thereof. The coils are connected to the reeds by leads, indicated generally by the numeral 101 in Fig. 15, which extend from a bath of the cartridge so that the pickup can be connected in the usual manner to the amplifier system.

The Parmanentmagnet 110, which is also a solid cylindrical Has shape is in the support structure 99 at the center of the four Cores arranged with its axis paaLlel the axes of the cores lies. The four cores are approximately the same length as the permanent

909806/0774 -30-

BATH ORIGINAL

oagnefe and made of a material with high magnetic permeability, e.g. , soft iron or a high-iron alloy or axis in any other suitable magnetic material.

, Leder dez · Ket-iie 1OS _p 103, 104 and 103 ends in a flat lower end face 102a, 10? a "lOfta bsw, 105a, and the Pwmanößttaagnet 110 ends at its lower end in a roughly horizontal surface 110a"

The coils are connected to one another within the cartridges "v.'obai the coils 108 and 109 form one pair of coils and the coils 106 and 107 form the other pair of coils" The coils or these pairs of coils are electrically connected to one another in such a way that those with opposite polarity are in them add the induced voltages.

The body of the interchangeable scanning unit 100 is also produced by Sehmes-eii or öieBen, preferably made of the same material as for pouring in the solid part of the cartridge, and contains the other components of the pickup. The crack of the exchangeable scanning unit is so » that it easily fits into the slot 110 in the bottom of the cartridge 99 can be used and is held there firmly.

When the pickup is assembled, the FLSche HO-A of the permanent magnet part is 110 ^s , which

909806/0774 -31-

BATH. ORIGINAL

int the replaceable Abtastaggregat 100 feet eingesohaolsen 1st, in the vicinity of the surface 11OA of the permanent magnet 110 "The permanent magnet extension I) O 'forms a magnetic"

Coupling piece, which forms a tang of the permanent agent 110 and is made of the same material as the permanent magnet. One recognizes > \ m \: 6f.n structure based on the

Figure 20, which shows this apparatus from the bottom · The main part of the magnetic projection 110 ^ς is auegebildet cylindrical and has the same diameter as the permanent magnet 110 'so that the surfaces HOA and XLO-A are quite adjacent if | the replaceable scanning unit is inserted into the slot 111.

A V-shaped groove is provided at the other end of the permanent magnet forts 110 *, and each side surface of this XUt terminates in an elongated horizontal flange so that it has a T-shape, the puddle forming the upper or horizontal region of the T-piece . The facing side surfaces of the V-shaped groove form a right angle with one another and are inclined by 45 ° to the horizontal, so that the inclined surface of the flange 110-B forms an angle of 45 ° with the horizontal and a right angle to the inclined surface * of the flange 110 'forms »which is also inclined at 45 ° to the horizontal . The Baltekanal 112, which is made of a suitable non-magnetic material, ZvB. Made of brass, has a V-shaped cross-sectional shape. Its side surfaces are perpendicular to

- 32 -

909806/0774

BATH ORIGINAL

each other and form angles of 45 ° with respect to the horizontal. This part is in the V-shaped groove of the Permanentmagnet® » arranged. When the retaining channel is located in this hat, there is a veil of the outer surface of one side of the Retaining channel near the inside surface of flange 110-B and a rope on the outer surface of the other side of the retaining channel near the inner surface of flange 11o-C. In the Halt.ekaael Is a red tea egg shaped directly above the permanent magnet Slot 112 'is provided so that the magnetic coupling part 115 which is inserted into this slot 112, near the inner side surfaces of the V-shaped hat dee Permanent magnet lies. The magnetic coupling part 113 also has a V-shaped cross section. Its side surfaces are at right angles to each other and form an angle of 45 ° to the horizontal. The coupling control 113 is off Magnetic iron made with high permeability and low magnetic resistance, so that a minimal magnetic Voltage drop occurs in the coupling part. Bs is shaped so that one of its side surfaces is closest to the flange 11o-B of the permanent magnet and the other side face next the flange II0-C of the permanent magnet.

The hollow cylindrical armature 1Ht, which is also made of magnetic iron of high permeability and low beluctans, to ensure a minimal magnetic voltage drop

909806/0774

BATH ORIGINAL

To obtain anchor has a follower pin 115 which extends from an end face of the anchor and is held within the channel 112 by a retaining block 215, its axis being oriented parallel to the side surfaces of the channel 112, the holding clot supports the anchor in its center _o It is also a retaining spring 116 vorgGHQhen ₉ with its one IC-aic on the Klota 215 and with its other end firmly attached to a HaXtek ^ nal 112 at the point 117 and supports the retaining block.

Holding cloth 215, which can be made of any suitable dampening material, e.g. yisooloid, surrounds the armature completely at the central point, with part of the circumference in the vicinity of the magnetic Coupling part 113 lies so that the armature cannot touch this or the brass retaining channel »

The retaining wire 116 is made from any suitable spring wire that supports the viscoloid block and anchor as well as the stylus can hold self-supporting »

The exchangeable scanning unit 10u also comprises cast-in pole parts 102 ', 103', 104 'and 105', which form the ends of the cores 102 _9, 103 , 104 and 105, respectively. Each-

-34-909806 / 0774

BATH

- 54 -

of these pole pieces is made of α on the core material and forms a magnetic coupling part within a rectangular cross-section and an upper surface in FIG Near the lower surface of the corresponding core part » when the replaceable scanning unit is in the slot 111 of the cartridge, and has a second surface, the one Forms an angle of 4-5 ° mU of the horizontal and is parallel to the side surface of the holding part 112 lies.

In the drawings, the surface 102-A of the pole pieces 102 is in the vicinity of the surface 102-A of the core 102, if The cartridge is fully assembled and the pole surface 1U2-B of the pole part 102 'is parallel to one Side face of the retaining channelo The pole face 105-B of the pole Point 105 'lies parallel on a side surface of the neckline and in the vicinity of the surface 105-A of the core 105'

Similarly, the pole faces 103-B and 104-B of the pole pieces 103 'and ₀ 104 "respectively lie parallel to the sides of the central channel, so the surface 103-A of the pole piece 103' lies in the vicinity of the surface 103-A of the core 103 and the area Λ of the pole piece 104 'is in the vicinity of the surface 104-A ₉

of the core 104 » / when the cartridge is fully assembled «

In the assembled state, the cartridge has four magnetic flux paths o, as shown in FIG. 16, one of these comprises

909806/077 4 - 35 -

3AD ORIGINAL

U22539

Flux paths the permanent magnet forteatz 110 " ₉ the magnetic coupling part 113" the armature 114, the pole part 105 "" the core 105 and the permanent magnet part X10

A "further comprises the magnetic Leitungeweg Perma -nentmagnetfortsatz 110 _'9, the coupling portion 113' at the -ker 114", the pole piece 104 ° _s the core 104 and the Permanen taagneten 110 "

A third magnetic conduction path includes the perm »

magnet nent / orSsatz "the coupling part" the armature ₉ the oil part 102 * the core 102 and the permanent magnet _o

A fourth magnetic Leitungeweg comprises the permanent magnet extension 110 * ₉ the coupling member 113 the anchor 114 _P, "the ^ ¹ Olteil S 103 the core 103 and the permanent magnets 110 ο

The mode of operation of the pickup illustrated in FIG. 16 is essentially the same as that of the previously described types of movement of the armature 114 in FIG Direction towards the pole faces 105-B and 104-B or from this path generates signals of opposite polarity in the coils 109 and 108, the amplitudes of which are added and, after suitable amplification, a loudspeaker is given «the movement of the anchor 1" JU iii direction on the PoUfläohep 102-B and 103 "B or away from servants

909806/0774 \

Ia endorses the coils 106 in the & 10T signals'vmi-opposite «setatsr-polarity ₉ whose amplitudes are added» na "after suitable amplification a © ni loudspeakers are gugefüSurfc« On this Yiels © the sampling of single stereo information from the ¥ «takes place @n Hill «öimer Schall«

The above-mentioned feature of hum compensation is also present in this device, since the coils 109 and 108 are so ssusasmengeachalt SiBd ₉ that the signals generated on ßrusi by external fields in these coils, which have the same polarity _P cancel each other _c Di © gl @ The same effect is achieved in coils 106 and 107, and the signals induced in these by external fields also increase to ₀

A modified form of a removable, for use in Tonabnehmerpatrdne 99 * ^s * the figures in-24 - 27 and with the Bsaugeziffer 120 versehenο 25er body of austauschharea Ahtastaggregates 120 is gesehraolsen BEZW "poured _p tand awar vorsugswei * se from the same material such sum Mngieesen of the fixed part of the cartridge, and contains the ührigen components of the pickup, "the replaceable Abtastaggregat has such i? traktorra ₈ that it> slightly in order to slot 3:11 at the

■■■. ■■ .- -37 ■ 909806/0774

ÖAD ORIGINAL

· * 37

Bottom of the cartridge 99 can be inserted and there is held firmly in place »Semäss deu drawings is the Outline similar to that of the Austatuseh & aren scanning unit ea 100 ο

Figure 24 s "IGT a AKsfÜhrungsforms, aear bsi a permanent ·» magnetforttes ^ c * 121 is provided _P ei "ar ratagnetisches a coupling part and a continuation of the permanent magnet 110 * in the cartridge 99 'forms said? Extension has a substantially flat face 121 ^s having a laterally mounted therein rectangular slot 122 _o In the slot 122 is a cold bridge 1'25 and a Dämpfungeklssen 124 provided "with dent Kőér ^ r 120 as well as with ropes of the magnetic coupling Stuckes 12I ₉ which extend under the magnetic coupling part are "cemented" The retaining bridge 125 is made of nitrocellulose and the damping pad 124 made of Viaooloido Bs \ but other suitable materials can also be used for this purpose. "The retaining bridge 125 and the damping pad 124 attached to it hold the Anchor 125 _9, which passes under the face of the coupling part, in the right place. "

The armature 125 is made of magnetic material and carries at one end a tracer pin 126, as already described above »

909806/0774 ~ ³⁸

BATH ORIGINAL

The armature continues to be held by a resilient wire sehwiagbeweglich 127 _s of the connected to the armature, and having a hook end 123; which is cemented with the body par 120 * ^if '

consisting of einesa wagnetisohea material coupling part 129 is shown in detail in Figures 26 and 27 beschriebeiio Bass coupling part 129, the cores 105 and 104 couples magnetically with the anchor 125 'and swar in a ®eiße "dia about the type of coupling of the parts 105' and 104 ⁹ for coupling the armature 114 to the cores of the embodiment described above corresponds to »The core coupling part 150 is identical to the cable 129 and couples the cores 102 and 105 with the armature 125»

Since the core coupling parts 129 and 150 have the same shape, only one of these parts _9, namely the part 129 »in connection with FIGS. 26 and 27, is described in detail below

Sas coupling part 129 has two oppositely arranged Pole pieces 151 and 152 each having a surface which together form a right angle ei & schliessga According to the drawings, surface 151b forms the part 151 is substantially at right angles to face 152-B of piece 152 »The top of the pole piece

Vt

909806/0774

original-

U22539

131 has a flat end face 1

on o the near the

Face & Ö3-A desi core 103 Liegi when the part is inserted into the recess 111 120 _p, the upper portion JMD of the pole piece 132 has a flat surface 132-A & ut ₉ lying close to the surface 104 A of the core 104 ₉ when the Cartridge is gans ausararaengebant * pie surfaces 13I = A and 132 »A coincide with the surfaces 103 ~ A \ m & 104» A shown in Figure 15 *

In the embodiment according to FIGS the pole pieces through with these natural feedback

133 connected ρ who take care of it

that the magnetic

Iieitungswegj in which the oil part 131 lijsgt, is coupled to the magnetic conduction path _p ii | on which the pole piece 132 lies "

. " II

The upper areas of the pole parts are cut off ₉ to form a curved recess 133-A, so that the part 129 cannot collide with the movement of the armature 125 when it is installed in the abutment unit «

They formed core coupling parts 129 and 130 bis / öj au & magnetic iron of high permeability and low relmc ^ ance, so that a minimal magnetic separation occurs in the coupling parts _o the flat surfaces of the

909806/0774 " ^li . F '. ··.

BAD ORIGiNAU

ICemkuppXiiiigstelle 130 are through the Sesiigsslff @rn 154-Ä raid 135 ~ A "and covered with dsn surfaces 131-A bessw »132M of the coupling part es 129 zu8eaHB © n ·».

When the cartridge is therefore gams zusammeageljaut i # t _s the end face 131-A of the Polteilee 129 Babe S ± irnfl £ height 103 "A of Keraes 103 and the Stimfläohe 132-A 4β8 P ^ tei" lee 129 close © of Stiraflätshe 104 -A of the core 104 "The oil® surface 135-A of the Eemteil® © 130 lies at the same level as the end face 102-A of the core 102 and the end face 134 is close to the core part 130 © the face area® 105- A dea core © © X05 »

The patron © has iss & iis & mm®ng®bmn-b®n state four aeh © Lsitimgawege "One of these! © Itungswsgs includes magn © ti @ 0lie .Kupplungsteil 2I ₈ whose © Isera face the permanent magnet is near the Fläch® HO-A , like armature 125 "the star surface 131-A _P the core 103 and the permanent magnet 110"

A swelter cable path includes Se® Idagnstkupplungstell 121, the starter 125, the surface 3.32-A the core 104 and the permanent magnet 110.

A third magnetic path includes the magnetic

-41 ^

90 98 06/07 74.

* 'BAD ORIGINAL

table coupling part: 121 »the armature 125« the surface «135« A ₉ the core 102 and the permanent magnet 1X0 »

The fourth magnetic Iieitungsweg includes the magnetic coupling member 12I ₉ don anchor 125, "the Kamober.flächβ 134-A ₁ the core 102 and the permanent magnets XLO ₀

The mode of operation of the fonabnehnmrs with the interchangeable. The scanning unit according to FIGS. 24 to 27 is in the wess. The same as that of the pickup according to the previously described forms of guidance, with the exception that the compensation for avoiding over-speaking is designed differently. This is described below.

The movement of the armature 125 on a pole surface 131-A or 135-A around or away from these induces signals in the coils 107 and 106 with opposite polarity Armature 125 on surfaces 132-A and 134-A around or away from these also induces signals in coils 108 and 109 of opposite polarity, the amplitudes of which are added and, after suitable amplification, fed to the loudspeaker

~ 42

909806/0774

V ^ shaped a groove of a record stored stereophonically © sound sampled

In this AusflihrungsforHi the compensation is done with "t © ls a Kompenaationskupplungsteilöa 133 _s which treats" überliegenda pole faces <> connects the Kompen · together * sationerüctekupplungstell 133 serves dasm, a IEIL the increased flow through a Icera due to the armature movement 125 In those core nebenzuschliessens -the / ler ^ eni · »is assigned to the opposite pole face« in relation to which the As & er is moved in parallel ρ which, however, shows a decrease in flux due to the increased magnetic voltage drop in the armature »The magnetic conduction path that is assigned to that pole face ₉ opposite the SiOH the armature moves at right angles "is bezeichnetj as a signal channel and the gegenübesllegenden ^ olflachen associated Leltungsweg as Buhekanal _n Both äugen- occurred on bllcklioh"

When the armature 125 Z ₀ B _{0 moved} closer to the surface 131 -B, which then belongs to the signal channel, the air gap in this conduction path decreases so that an increased flux flows in the coil 103 and in the armature 125 _p and the flux in the core 104 decreases accordingly _p , this being in the quiet channel »The decrease occurs

■ - 43 - ■ • 90980E / Q774 - '

BATH

Seibat then «when the armature moves parallel to the pole face 132-B. The reverse coupling part 133 conducts part of the flux from the pole face 151« B to the core 104 » vem the loss of the magnetic flux in the rest channel as a result of the increased magnetic voltage drop to balance the anchor »

If 125 at right angles? Olflache 131 ~ B moves in a similar catfish the armature of the J wirdp takes the air gap in this Iiaitungeweg su _s so that the ^ ents in the core 103 decreases, the * assumes at that moment belong to the signal channel as a result of the flux in the armature 125 from and accordingly also the magnetic voltage drop in this on örund an increased flux "in the pole face 132" B _f which is at this moment in the rest channel. The flux decreases even if the armature calibrates parallel to the * Oil area 132-B moves "

At this moment, a 3! Part of the river a from the Pole face 132-B removed via the compensation part 133 to the increase in the Buhekanal due to the decreased To compensate magnetic voltage drop in the armature. The compensation part 133 thus has the effect that the system is stabilized and that magnetic non-linearities due to changes

909806/0774

1422639

of the magnet! see Spanimngsabf & XXes -in a anchor that will be

The just described ¥ orrie! Iti2ng also indicates brumm “koffipeiisatiöiiiseigensöfeaften ₀ because the coil © 1Ö9 _O XÖ8 ₉ 106 and 10? In the Fatronenhassptteil- 99 bo, _P that act in the coils 109 and XÖ8 through aiisssr © fields

Signals and iie lsi. The coils 106 and 107 external fields are indussiertea SS, giial © .sich

The invention can be aiasti ang®wesäet werisn, at me ^ B with two tracer pen © » in Rfl © keK <~ ®n» Eüe &: © B- arrangement (back to back) ο bar poured® Ü? Ona% nefe & rk8ryer * in figure 13 It includes a * permanent magnet X41 and four coils 142, 143 ₁ 1-44 uad 145 rait d®B % ®g®buvig®n K & vnm, di ©. Arranged in the glelohen white ©, are as shown in Figure 16 ereiölittioli is to Se * 'body 140 1st with smooth Soblitsen-146 and 14? veraehrä. (a »e 'figure 13 is missing

ma di © exchangeable Alstsstaggregat® 148 149 a * ufsuneliiä®n _o Jade® iieser a ^ etausolibarexi Ab- »taätaggregat © is designed the same as the unit 120 in the figures 24 and 25»

When operating the ± π 2 * lgur 13 shown

«45 -98 0 6/07 7 k

BATH ORIGINAL

If either the scanning unit 148 or 149 is selected and placed on the RIIIq of a record while the stylus is not used on the other unit, the pick-up and the information contained in a record groove are then true in the same way as the pick-up according to FIGS. 15 to 15

It Ift apparent "that the Stereotonafesehiaer the invention, a" very good glelohmässige and "Again" · gabegiite _e has a Plattenafemitaung Yerrisigsrt IMD äuesere StöreignaSe iis essential ouch @ olialt © Ausaer to the exchange can ALCN the _{Abtastaggregat?} if s "B" the stylus is broken or worn

The invention can still be used in manifold modified forms. other Seise under ä & m general Erfindungsgedankena realize <>

Patent aasisradhe 8

90 9806/0774

Claims (1)

Io llektroiaeülsasischer Wa & dl @ r ssnss convert © iner all «soapy» movement of an anchor and a scanning unit under the influence of the various walls of a «si-sr Hill © @ in @ r Stereoseliallplatt © la äswai separated © 0l € ktrIsohe Sigaale _e öia correspond to the information @ iß® usid reenten canal _s gekennzsiohnst @in taar pole part © »the front surfaces in € er HSh» the beekeepers have _c through a permanent magnet. » & e? ao afigeordBet is _a that a magKetisclitr circle exists over the Asa & er and duroh @ in®nd «jr <folteil® and over the anchor @in S ¥; eit @ s ^ olteil, duroh © ine every® pole g «g © ordaet® §pul @ ₉ so that changes d © @ magneti» soh @ nf lasses in the ^ olteilsn in ö © a assigned © »coils signal voltages indusler en" -und iuroh .eine .compen ". Stationary elite to dan magnetic. Strokes diaroh ei * mm ä®r Polteil® essentially solder constant ssu.'have if ~ the MagnatflMss in the armature on (brand ton movement © n of the same ** in the direction of the other® FoIteil or away from it as well as on drund the resulting on-the magnetic resistance * in the magnet - through the inker and through the other pole piece to » «, 47« 909806/0774 BATH 2o converter according to claim I _9, characterized in that the Korapensationsvorriehtung iet iet ₉ changes in the magnetic resistance in the magnetic conduction circuit over the armature and through the one Poltsil are generated to the magnetic flux dtareh this pole part is essential "with changes in the ^ Xiasses Xn ä © with the armature and in the event of a change in the magnetic resistance β »the magnetic circuit through the armature waa through the other pole part - due to the movement of the armature in relation to the other pole part or away from it - to be kept constant _S is 3 ο converter characterized according to claim I ₉ that the Korapensationsvorrichtung as a magnetic line circle formed which runs parallel to the Magnetkrsis via the armature and the one pole, so öass changes in the magnetic resistance of the! "© ituiigskreises over which a pole part with Movements of the armature in the sighting of the other pole part or away from it can be reduced <> 4 ° converter according to claims 1 to 3 ₈ characterized »that the compensation device comprises a magnetic shunt between the two pole parts _{9 of} the «48 - 90980 6/07 74 ^ BATH part of the magnetic flux sBwise & sra the anchor and insert the pole pieces into the e & der® 5 * converter according to claim 1 to 4 _e characterized in that the Kompensätionsvorrlcbtung a magnetic tilting lung part includes _p welohee sait öem P®rm @ a © ntm @ gndt @ n. connected unä inäwktiv with the anchor is unä. in the vicinity of the corresponding <S @ m SoltlMasheR extends »magnetic flux Kwi @ eh @ a & m ^ ppiungeteiX 'and' den ^ ®lt @ il @ n independent of S @ m A'nk @ r iat «with the exception of a specific one. Area in the narrowest HMJsβ of @ isfspreehi * iö © B 6ö Wsüäiisr Baoh Claims 1 to 5 p daduroh- gekemiüeioh-. "FlasB the" omgensationvorrichttiiig Stirafliehen "which includes" those at an angle of more than 90 ° are arranged »so that the anchor at Moving in line with an ole surface bait by d'ie " © he continued also a © movement of lower size® in looked at the other face ? "Transducer according to" Claims to 6 ₉ thereby gekiuuuMiobnet "that the armature is designed longitudinally and in a central area between its ends is mounted so that the movement of an index is dös armature 909806/07 74 BATH a entsprechendβ reverse movement of the other end of the armature results in ₈ and that a ■ £ wide pair of PoltQilen in the ¹ SStQ dea Ankere disposed »wherein the d a pair of @ r Stel parts faces" in a plane parallel to the face of a ^ oltöilee the first Polstüokpaares IiegV ₉ that the "wide pair of Polstüöken has a Stirnfltohe ₉ pensationavorriohtung in a plane parallel au Stiniiläoh® of the other olteiles ^ is the first Polteilpaares" and that for the "wide pair of Polstuökeii a grain ·" is provided" Thus converter according to claim 7 »characterized by the fact that each pole part is assigned a coil» where '^ i ^ ₉ one pole part of the first pole part pair sugeoru _{% tl} j Ie in series with the coil of one pole part The second pair of poles is switched ₉ so that the electrical signals induced in the corresponding coils add up and the electrical signals induced in the corresponding coils in the corresponding coils are subtracted. 9 "Converter according to Ansfi * ößlt 7, because each pole part has a coil« wgeor **** ^^ ** «ο ¹ » « ^{1 die} 909806/0774 BATH Coil & Q & sw®it® & pole part of the first pair of pole parts® © in SeI ¹ Ie with d @ r Spill® of the second pair of parts is gascfealttii, so that in this. Coils induced elektrisabsn Signal® sieve add and the by äussor® saagiä © ti @ © h® f eld @ r in ämi coils indusi erteai electrical signal a & ± oh tvahlerena For H © rrs WALTER QhTim PATFNTANWAtTE ORWNS. H. FINCKE, DIPL.-ING. H 909806 / 077A ' ORIGINAL BATHROOM