DE1772683A1 - Stereo pickup - Google Patents

Description

It 10T2

Nippon Columbia Kabushikikaisha, Tokyo / Japan

Stereo pickup

The invention relates to a novel one Stereo pickup for 45 ° -45 ° stereo records. Which he

specifically relates to a stereo pickup with a moving magnet.

In a known stereo pickup with a movable magnet, an arm is attached to one end of a rod-shaped magnet, and a pen is attached to one of the baths. The bar magnet is carried by a damping element in a housing with an approximately square cross-section . With such a construction, if the needle vibrates in the grooves of the record during playback, there is a risk that the vibration will shift, which will result in distortions in the sound reproduction. The well-known pickup is therefore, as far as the vibration of the needle (the stylus) is concerned, old the Haohteil a very complicated mechanical construction, afflicted.

21) 1 * 01/05 * 2

BATH

As an improvement to the aforementioned pickup with a movable magnet, an Ortofon stereo pickup was used proposed with moving coil. Its center of vibration is definitely near the Center of gravity of the armature, so that the problems occurring in the known pickup with movable magnet are avoided. On the other hand, however, a cartridge with a movable coil has the disadvantage that the vibration system has a great hate, because there is a winding on the armature.

The invention is therefore based on the object of designing a stereo pickup so that the disadvantages dor known designs are avoided.

The pickup according to the invention is essentially characterized in that the armature is plate-shaped and magnetized in the direction of its thickness, that the arm is further connected to the armature in such a way that the axial direction of the arm intersects the plane of the armature at a right angle ner devices are provided for holding the anchor in such a way that the vibrations center of the vibration system , which contains the pin, the arm and the anchor , lies approximately in the center of gravity of the anchor , and furthermore, devices for the formation of a plurality of old " ■ the armature cooperating magnetic paths provided β lad »

209809/0512. i

BATH ORIGINAL

further windings on the magnetic circuit

These and other details of the invention will emerge from the following description of some embodiments illustrated in the drawing, Ee show:

Pig.1 is a schematic (enlarged) front view an embodiment of the stereo pickup according to the invention;

Fig. 2 is an enlarged cross-section along the line H-II of Figure 1;

3A-3C diagram subdivisions to explain the Principle of invention}

Fig. 4A and 4B schematic divisions to explain the Principle of the 4-way setting of the stereo pickup;

FIGS. 5A and 5B show two further base representations corresponding to FIGS. 4A and 4B;

Fig.6 is a diagram showing the relationship zvisohea the . Position of the armature and the existing magnetic flux illustrates!

209808/0882

BAD ORIGiNAU

-r 4 -

Hg »7 and 8 enlarged front view of two more Embodiments of the stereo pickup;

PIg.9 a side view of one of the pickups usable magnetic core;

Pig «10 a side view of another embodiment

ΐ Si * ■

example of the pickup according to the invention}

FIGS. 11A-11C are views of others in the invention. anchor shapes that can be used in accordance with the pickup;

Pig.12 is a perspective view of a pickup according to the invention with part of its holder.

As is apparent from Figures 1 _a and 2, the arm 1 carries at one end a pin 2 and is connected at its other end with a flat armature 3, the south pole Ksmpietieierung IORD having sighting In its thickness "ine. The anchor 3 let »ο designed that its center of gravity lies in its smock ·· lf; "R is further shaped so that it" yoMtrlaefc m * w "i" ngtnocmenen straight lines XX and TT, dl · intersect the Mittelaohee ZZ and to each other rather form · Angle, further symmetrically to a angtnoüswaen line 0 - O * which the mentioned lines XX and TT under a »

101109/0682

BATH ORIGINAL

Angle of 45 ° krouitti «ad dl« Hlttelaoswe f-f the. As in Figs. 1 and 2, the Aaker's canoe 3 In Formed for »a plate» tin »dl · · 1η · Sülle · τοη for example «n * n 0.5 s» and a qua4rati «oliee Has cross section ron 2 χ 2 na. .

The arn 1 iat aa anchor 3 "is attached in a" high position "so that the middle aohae ZS the anchor" 3 falls in the direction of a thick "about" it the Aohee de Ajrms 1 in Lingericbtung sueejBien, that the Sctawerponkt α de " Anchor 3 in or nail · the Ylbratioaeaentn »a · Tibrmtioneeyβtemee lies and that · the anfenoemene line 0-0 runs approximately in the same direction as the pin 2. "■. '-;.. ■■" - _; ; .

Two Bagnetisoh core "4" and 4L and triangulation of the assumed lines XX and TT etri "oh sur line 0-0 the TJtafang de Anchor 3 arranged opposite. In the illustrated embodiment, the magnetic cores 4H and 4L are seen under the armature 3 ror «

The magnetic nuclei 4B and 4L have a large number of elements (as shown in Fig. 3); they have three plate-like magnetic poles P ₁ , P g and p- _t which are equidistant from one another on one side and are connected to one another, ^ i * relative position of each 'the '

209809/0582

Magnetic cores 4R and 4L compared to the> nker 3 is such that where the pin 2 is not exposed to any vibration, namely in its quiet tends state, the central magnetic flat pole P ₂ lies on a line LL, which passes through the center of gravity of the armature 3 "Ntal I the vibration center 0 of the vibration system runs and the central axis ZZ de" 1 crosses at a right angle. On the central magnetic poles Pg and windings 5R b * w. 5L provided

A fine core wire 6, 4, for example, made of flexible "metal, let through" leads through a cylindrical unitary attachment 102, which is inserted into an opening 10t in the holder 7 , the wire 6 is hurried to "! Sud * dee Siheet parts 102 beiepi'elewei-βθ attached by means of an adhesive or the like. The binocular part 102 is attached to a double-ended binaural tube 104, which is screwed into a socket 103 in the holder 7. The other Buie of Cera "wire 6 is, for example Nittele an adhesive barren like on sine" BSjBf fixed 106 is attached to the ia Arn 1 · Sex wire 6 is fexner duroh a seatrale opening of a swieohstt the armature 3 end of the holder 7 angebraöhten Mtepftatigeelejientee β and by a 0 ~ "in" IQg

20MIdZQIIJ '"Λ MSWI ^ nal

Are those recorded on the Sohall record Signals are large and the core wire 6 is missing in the explained V ί bra ti ons eye tea, the Dtteplunge eleiient θ in axial direction of Army 1, that is, in the direction of the Z-Z line. As a result, eioh is postponing also the Vibrationssentruai dee Vlbrationasyeteines in Direction of the line Z-Z.

Since according to the invention, however, the core wire 6 at both ends rait the Arn 1 bsw. the bracket 7 connected eats, there will be a shift in the vibration system Direction of the line Z-Z prevented. However, since the core wire6 is flexible and thin, it does not hinder the Vibrations in all directions in the center of vibration des Vibrationasyeteaes with the exception of vibrations in Direction of the line Z-Z.

In the following, the principle of the pickup according to the invention will be explained in detail. Let it be said that the pin 2 vibrating forces proportional to the angle and left at an angle of 45 ° compared to the axis of the anchor 3 running vertical axis 0-0 ", that is, from the directions of the Lines XI and TT. The vector R dea Reöhteelgnalea, which acts on pin 2 in the direction of the neck 3L-X , sets β loh on one

20M09 / 0682

horizontal component Rg and a vertical Koaponente Ry together. The vector -R also sets see from -Rj, and -Ry together.

With reference to FIGS. 4 and 5, it will be explained in more detail below how the armature 3 is steered out by the vectors R and -R. Due to the vertical component Ry dee vector R v / ground, the armature 3 and the arm 1 are moved according to the dashed lines in Pig.4A. If one defines the movement of the armature 3 from its position drawn in full lines towards the side of the arm as a minus (-) movement, the upper corners 3C and 3D of the square armature 3 are + A and the lower corners 3A and 3B shifted by -A. The anchor 3 and the arm 1 are displaced by the horizontal component R "of the vector R, as indicated by dashed lines in Pig" 5A. In this case, for the corners 3B and 3C of the anchor 3 external articulations + A and for the corners 3A and 3D external articulations -4 ·

The vector R thus moves the corner 3A of the anchor 3 by -24 from the neutral position and a displacement of the corner 3C by +24 from the neutral position. The movements of the boks 3B and 3D through the vertical and horizontal components Ry and Rj ₁ , on the other hand, are directed in the opposite direction, so that the movements are canceled out and no shifts.

209809/06 * 2 bath original

Exercise of the corners 3B and 3D takes place.

By the vertical component -Ry deo vector R of the armature 3 is moved, as indicated by dashed lines in Figure 4A, that is, the corners 3A and 3B of the armature 3 to .4 + and 'the edges 3C and 3D to - A . The armature 3 is moved according to the dashed lines in FIG. 5A by the horizontal component -Rg des.vektors -R. The movements of corners 3B and 3C are -4 and those of corners 3A and 3D are 4- A. The vector -E thus shifts corners 3A and 3C by +2 4 and -2 Δ, respectively, from their neutral position.

Thus, a vibration force acts on the armature 3 in the direction of the line X-X, its corners lying on the line X-X are vibrated, but not the Corners on the line Y-T '. In other words, leaves one in the direction of the line X-X vibrating force the anchor 3 vibrate around line Y-Y.

If a force acts on the pickup that vibrates in the direction of the line Yr ', that is to say,' I am Tektör L of the left signal, the ticks of the anchor 3 on the line YY vibrate around the line XX.

* If a force is exerted on the armature 3 in the direction of the line XX ", then dia ^ cken 3A \ ιτιύ 30 vibrate

as described above. As can be seen from FIGS. 1 and 3 , the corners 3A and 3B are opposite to the magnetic cores 4R and 4L, respectively.

If the armature 3 is in its standstill position, the icke 3A (or 3B) of the armature 3 assumes a position opposite the central magnetic pole P _{2 of} the magnetic core 4R (or 4I>), as shown in FIG. 3B. In this case, a magnetic flux φ ^, which emanates from the armature 3, runs through the magnetic poles P ₁ and P ₉ and returns sum armature 3; a magnetic flux φ η emanating from the armature 3 runs through the magnetic poles P "and P_ and returns to the armature 3. These two magnetic fluxes are of the same size in the central magnetic pole P ', but are directed in opposite directions. In the winding 5R {or 5B) provided on the central magnetic pole P «, no electromotive force is therefore generated«

3s the case will now be discussed that ümx anchor is exposed to the mentioned forces R (-R) and L (-L), especially for reasons of simplicity only R and -R. If the force R or -R acts on the armature 3 »eo, the corners 3A and 3C etc. / 24 / are deflected in relation to their neutral» position. In this case, the relationship between the 4-way corner 3A of the armature 3 and the magnet core 4R changes as shown in FIGS. 11g, 3A and 50. If the corner 3i. of the Ankora 3 Eua left Megnet-

209809/0882

pole P _{1 of} the magnetic core 4R moves, as shown in Iu Pig.3A 1st, when the armature 5 is magnetized in the direction of its thickness with the polarities indicated, eo increases the magnetic flux ψ ^; If the corner 3A lies in the middle between the magnetic pole P ₁ and the central magnetic pole P ₂ », the magnetic flux φ reaches its greatest value. This results in changes in the magnetic flux of the central magnetic pole P ₂ , which causes an electric motor-like force in the winding 5R «

After returning to its initial position (compare Pig.3B), the armature 3 is opposite the central Magnat pole Pp. Under these circumstances, the magnetic fluxes φ and φ in the central magnetic pole Pg ^{νοη are of} equal magnitude and opposite direction, so that they are called one another. In the central magnetic pole P _{2 there} is ice in the resulting magnetic flux, and a magnetic flux now flows from the pole P ₁ directly to the pole P «. No electromotive force is generated in the winding 5R «

If the corner 3A of the armature 3 has moved from its position in Pig.3B to a middle position between the central pole P ₂ and the right magnetic pole P, (compare Pig. netpol P ₂ to pole P, flowing magnetic flux φ ₂ its

Maximum value. In the winding 5R is corresponding to the Changes in the flowing through the central magnetic pole Pg Magnetic flux generates an electromotive force.

The _{magnetic flux flowing from the magnetic pole P 1} to the central magnetic pole Pg is considered in more detail below. For the sake of simplicity, let us assume that the magnetic core does not contain the right magnetic pole Pv, but is merely composed of the left magnetic pole P ₁ and the central magnetic pole Pg (ie U-shaped). In this case, the magnetic flux φ ^ has its maximum value when the corner 3A of the armature 3 in the middle between the. Poles P ₁ and Pg is located (as Fig.3A shows). The magnetic flux φ ₁ gradually decreases as the corner 3A moves away from the central position. Fig. 6 shows the relationship between the magnitude of the magnetic flux φ ^ and the relative position of the 3 A of the armature 3 with respect to the magnetic core, the ordinate represents the magnitude of the magnetic flux φ * and the abscissa the position of the armature 3 relative to the magnetic core In this graphical representation, the curve 9 shows the magnetic flux φ _λ , the points a, b and c on the abscissa illustrating the positions of the armature 3 in FIGS.

209809/0582 ^BAD

In the following, the το "central magnetic pole P ₂ to the right magnetic pole P-flowing magnetic flux φ ₂ t" will be discussed in the same way based on a magnetic core consisting of the magnetic poles P ₂ and P ^. The magnetic flux φ ₂ reaches its maximum value, vmn the armature 3 is located in the middle between the magnetic poles P ₂ and P; it gradually decreases when the armature 3 moves away from this central position The characteristic of the magnetic flux φ ₂ is illustrated in Fig. 6 by the curve 10

Since the magnetic core 4 is actually not TT-shaped but S-shaped, the magnetic flux φ flowing through the central magnetic pole with the winding 5R (5L) applied to it is composed of the magnetic fluxes _{φ 1} and φ 2 . This flux φ is shown in Figure 6 by the solid curve 11. The magnetic flux φ _{flowing through the central magnetic pole P 2} is β with zero when the armature 3 is in a position opposite the central magnetic pole P ₂ (compare FIG. 3B). If the armature 3 is moved from this position to the left magnetic pole P ₁ , the magnetic flux Φ flows through the central magnetic pole P ₂ from bottom to top; If the armature 3 is moved from the central magnetic pole P ₂ in the direction of the right magnetic pole P., the magnetic flux φ flows through the magnetic pole P ₂ from above

209 8 0 _{9/0 S 8 2 BAD}

below·

As curve 11 in Fig. 6 shows, the magnetic flux φ flowing through the central magnetic pole Pg changes linearly around point b to close to points a and c, where the fluxes (J ₁ and <$ ₂ reach their maximum values. The magnetic flux φ is therefore directly proportional to the movement of the armature 3. This ensures that the _{winding provided on the central magnetic pole P 2} supplies a distortion-free output voltage.

If the pen is subjected to vibration in only one direction, the relative position between the magnetic core and the one vertical to the direction of vibration arranged armature not changed as explained above. "In this case no voltage is generated in the winding provided on the magnet core, so that a ' For a stereo sound, harmful high crosstalk is prevented · The invention-specific pickup has therefore «in excellent behavior as a stereo pickup.

The use of a flat anchor 3 and the arrangement of the Vibrationesentruea dee Vibrationeeystemee reduced to 'or above the center of gravity 0 of the anchor 5

209109/0582

BAD QFHGJNAL

the mechanical impedance when looking at pin 2 and eliminates distortion and f-spreohen in the sound reproduction.

Furthermore, since the flat armature is magnetized in the direction of its thickness, magnetization can be carried out easily, which makes production much easier.

Although the magnetic cores 4R and 4L are arranged opposite the underside of the armature 3 in the previous exemplary embodiment, the magnetic cores 4R and 4L can also be arranged above the armature 3 on the lines XX and YY in the same ratio as explained (see Pig. 7). Han can also provide four magnet cores 4R, 4R * and 4L »4L * opposite all corners of the armature 3 in the same arrangement as described above. In the latter case, the windings 5R »5R ^f provided on the central magnetic poles? 2 of the magnetic cores 4R and 4R ^{1 are} connected in series; likewise, the windings 5L, 5L * provided on the magnet cores 4L and 4L * are connected in series with one another. These windings are also connected together so that their output voltages add up, resulting in a large output signal.

The above exemplary embodiment uses a- ■. .209.8 09/05 82. _BAD obigwal

NEN plate-like, E-shaped magnetic core 4 with the magnetic poles F ₁ , F ₂ and Γ ^ * ^ ^{5 iet} 3 "äoch it can be seen that the end parts of the magnetic poles F ₁ and P ^ can be bent inward, as shown in Fig.9 and that in other cases a cup-shaped magnet core with an E-shaped cross-section can also be used.

In the exemplary embodiment described, a winding is provided on the central magnetic pole Fg of the magnetic core 4 and emits an electrical output signal. ^{In other cases, however, windings 15R and 15L or 15R 1} JiL ¹ can also be applied to the magnetic poles F ₁ and F-dee magnetic core 4 (compare FIG. 10); in this case, the windings 15R and 15R ¹ are connected in series with one another, and so are the windings 151 and 151. The winding inside these windings and their connections are chosen so that when the armature 3 faces the central magnetic pole Fg, the magnetic fluxes φ ^ and φ «in the magnetic poles F ₁ and P ₅ in the windings 15R and 15ft '» 151 * and 151 * generated output signals of iron elephants. With such an arrangement, you can achieve an output signal that is free of distortion and crosstalk, as in your previous exemplary embodiment.

Albeit with the previous explanations. play the anchor 3 has a square shape,

2O9fi0e / 0S82

SAD ORIGINAL

you can use circular, cross-shaped, Use octagonal or similar anchors as long as they are flat anchors pointing in the direction of your Thickness with north and south magnetic poles are magnetizable (compare Figures 11A, 11B and 11C)., These armatures must therefore meet the requirement that their center of gravity lies on the central axis and its shape is symmetrical about two straight lines X-X and Y-Y that go in the direction the anchor level and each other under a right Cut angles. In this case the anchor is 3 so attached to the arm 1 that the lines X-X and Y-Y an angle of about 45 ° with the approach of the Pin 2 containing plane and the axial direction of the arm 1 form ,, Preferably the armature 3 is so arranged as close as possible to the magnetic cores 4R and 4L.

In Fig.12 is an embodiment of a recording S illustrated for the pickup according to the invention. A support rod R is attached to the bracket. There is a hole H in the receptacle S for the rod R. If the rod R is inserted into the hole H, the holder 7 and thus the stereo pick-up is received by the receptacle S. The receptacle Of course, S contains one of the for this purpose Shape of the bracket 7 adapted groove.

20d80970S82 'bad

This facilitates the assembly and disassembly of the pickup according to the invention and thus the replacement of a damaged pen with a new pen.

The shapes of the Ankerausflilirung illustrated and described thus far provide a restric- ™ effect of the invention. One can also order the firm around 1 (such as Pig, aeigt in dashed lines 2) a number of cylindrical members T _1, J _2, ... ... arrange the diameter of which increases as you approach the armature 3. This prevents a vibration of the arm I due to its slim design and thus suppresses the generation of interfering noises «

The invention thus allows numerous modifications and variations within the framework of the general inventive concept.

208809/0682 bad orig.nal

Claims (13)

Claims 1.) Stereo pickup with one arm attached to one end carries a pin and an anchor at the other end, characterized in that the armature (3) is plate-shaped and magnetized in true tune of its thickness, so that the arm (1) is also connected to the anchor so that the axial direction of the arm is the plane of the anchor under a right angle cuts »that further devices for holding the armature are provided in such a way that the vibratory center of the vibration system, which contains the pen, the arm and the anchor, for example The main focus of the anchor is that there will continue to be facilities for the formation of a large number of nit dem Armature cooperating magnetic paths are provided, further windings on the magnetic circuit. 2.) Stereo Tonatanetmer nmoh claim 1, characterized in that the arm (1) has an approximately conical shape having. 3.) Stereo pickup according to claim 1, characterized in that the armature (3) is flat and square is trained. 20900970582 4.) Stereo pickup according to .Anspruch 1, characterized in, that the anchor is flat and circular » 5.) Stereo pickup naon Anspruoh I, characterized in, that the anchor is flat and cross-shaped auefe. 6 ·) Stereo pickup according to Claim 1, characterized in that the armature is flat and polygonal is. 7.) Stereo sound * bneb »he according to Aneprucii 1» characterized by that the magnetic circuit contains S-shaped magnetic cores »... ^ 8.) Stereo pickup according to claim 1, characterized t that the magnetic circuit magnetic cores old j « two U-shaped euegibild «t« n magnetic core parts ent » 9.) Stsreo-Tonabnehaier according to claim 1, daduroh characterized in that the magnetic circuit cup-shaped magnetic cores with E-shapedia cross-section. 10.) Stereo pickup according to claim 1, characterized in that that the magnetic circuit contains two elements arranged opposite the armature. 11 ») Stereo pickup according to claim 1, characterized in that the magnetic circuit has awei pairs of elements contains, which are each arranged opposite the armature and whose windings are interconnected are that their output signals add up. 12.) Stereo pickup according to claim 1, characterized in that a holder is connected to the armature is to which a pin is attached, while a receptacle contains a hole in which the pin can be used to hold the pickup. 13.) Stereo pickup according to claim 7, characterized in that that the egg-shaped magnetic cores have windings on their central solenoids. H.) Stereo pickup according to claim 7, characterized in that the E-shaped magnetic cores on their right and left thighs have windings » 2Oft-toa / os-e2