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JPS5020441

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DESCRIPTION JPS5020441
■ Magnetic pickup of stereo record 0 Japanese Patent Application No. 42-1709. Application No.
42 (1967) Jan. 9 @ same applicant applicant 0 Waltor Oliver Stanton USA New York State New
York State Laurel Hollow Laurel Hollow Load [phase] Attorney Attorney Iida Osamu One outside
person
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a magnetic pickup
cartridge according to the present invention, FIG. 2 is an exploded perspective view of pickup
cartridge components of FIG. 1, FIG. 3 is an iron core, pole piece and current generating coil 4 is
an enlarged cross-sectional view taken along line 4-4 of FIG. 1, and FIGS. 5.6, 7.8 and 9 are lines
5-5.6 of FIG. 4, respectively. Sections along 6.7-7.8-8 and 9-9, FIG. 10 is a partial sectional view
of a casing supporting and incorporating a pole piece, an iron core and a current generating coil,
and FIG. Rear view of the pickup showing the contactor pin or terminal plug, FIG. 12 is a side
view of the current generating coil, and FIG. 12A is similar to that shown in FIG. 13 is a
perspective view of a pickup having an Explanatory drawing of the operation principle of the
pickup of the invention, FIG. 14 is a perspective view of a modified pick-up having two needle
assemblies or moving devices on both sides of the pickup cartridge, and FIG. 15 shows the
construction of the pickup cartridge of FIG. FIG. 16 is an exploded perspective view of parts, FIG.
16 is a perspective view of a subassembly consisting of a pole piece, an iron core and a current
generating coil used in a pickup cartridge, FIG. 17 is a longitudinal sectional view of the pickup
cartridge shown in FIG. FIG. 19 is a cross-sectional view taken along line [B] of FIG.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to magnetic pickups
for stereo records. It is well known that magnetic pickups have better fidelity and responsiveness
than other types of pickups, such as piezoelectric or crystal type. However, the stereophonic or
magnetic recording of the stereo record has various disadvantages in spite of such advantages.
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That is, a stereo-type magnetic pickup requires two magnetic circuits consisting of at least two
pairs of pole pieces, at least two iron cores and at least two sets of interconnected magnetic
circuit parts, and thus is bulky. Mass increases, parts and assembly costs increase. Also, in some
embossed magnetic pickups, it is difficult to maintain a clear demarcation line between the
effective sound groove and the so-called W silence sound groove, so that undesirable W crosstalk
l between both sounds Occur. The object of the present invention is to eliminate the advantages
and disadvantages of the conventional magnetic pickup as described above and to have a
minimum number of easy to assemble parts thereby reducing the bulk and mass of the pickup
Another object of the present invention is to provide a novel magnetic stereo sound pickup that
can reduce the manufacturing and assembly costs. Other objects of the invention not only have a
high degree of fidelity and response characteristics, but also maintain a clear demarcation
between the active and silent grooves, thereby substantially eliminating crosstalk or It is to
provide a stereophonic sound magnetic pickup which is minimized. Another object of the present
invention is to design the casing and parts so as to be easy to assemble, and to have a simple
structure with a minimum number of parts that perform satisfactorily over a long period without
comparative wear on the crucible. It is to provide a low cost stereo sound magnetic pickup.
According to the present invention, the pair of pole pieces, the current generating coil cooperating with the six magnetic [111111] EndPage: pole pieces, and one end of each pole piece
under the influence of the needle tracking the sound groove of the stereo record In a
stereophonic sound pick-up of the type comprising an armature movable relative to the magnet
and a magnet producing a magnetic flux flowing through the pole piece, the magnetic circuit
comprising a magnetic compensator co-operating with the other end of each pole piece; A phase
compensator co-operating with the magnetic compensator, wherein the magnetic compensator is
formed of a magnetic body and extended adjacent to the armature, and the phase compensator is
wound around the magnetic compensator Thus, a stereo sound pickup characterized in that it
comprises a coil of conductive nonmagnetic material is obtained. According to the invention, the
magnetic compensator and each pole piece are projected outward from the iron core in opposite
directions respectively, and the phase compensator is disposed on the magnetic compensator on
each side of the iron core member, the magnetic compensator And each pole piece with an
armature and needle assembly, thereby obtaining a pickup with a double conversion element.
Further in accordance with the present invention, the armature assembly includes a tubular
member which fits into the bore of the pickup and a handle which has a surface which cooperates with the surface of the vinyl up body or the surface of the housing and which is
attached to said tubular member. A portion is provided and the armature is pivotally mounted
within the tubular member to project outwardly from the tubular member so as to position its
needle carrying end in the groove of the end portion. The present invention also intends to
provide a phase compensator in the form of a coil wound on a magnetic compensator to
compensate for the phase shift due to the load current of the effective sound groove. Further in
accordance with the present invention, a shield forming a two-part cage leg is used to help
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compensate the magnetic circuit and to help prevent magnetomotive force or flux in the coil of
the silent groove. To that end, the shield is projected in an inductive relationship to the pole
pieces. The present invention will be specifically described in detail with reference to the
attached drawings. The present invention provides a pick-up cartridge of simple design with a
minimal number of parts that are easy to assemble, as well as providing pick-up performance
with control of all available variables. FIG. 13 is a schematic view showing the operation principle
of the present invention, and in order to fully understand the present invention, the operation
principle will first be described with reference to FIG. In FIG. 13, the cross section of the sound
groove 10 of the record is shown enlarged [111111]. The groove 10 is a 450-45 ° stereo
recording sound groove, each side of which represents one of the rain grooves. One side of this
sound groove is shown as sound groove A, and the other side is shown as sound groove B. Each
side is separately modulated with the sound grooves from the corresponding sound grooves. The
pick-up according to the invention is suitably provided with a permanent magnet 4 vibratably
mounted such that one of the poles of the magnet can be moved towards or away from the pole
piece in response to modulation of the sound groove. There is a regode hook needle 5 such as a
diamond, for example, attached to the support structure. A magnetic circuit is connected to the
ends of the core 2 and has pole pieces 1a and 1b representing two grooves. It is desirable that
the pole piece and the iron core be formed of a magnetic material, and in particular, be formed of
a high magnetic permeability material such as iron, nickel or an alloy thereof. The iron core is in
the form of a cylindrical rod as shown. At both ends of the iron core, current generating coils 3a
and 3b are wound adjacent to the iron core. The coil 3a is a current generation for the groove A,
and the coil 3b is a current generation coil for the groove B. The permanent magnet 4 is shown
in FIG. 13 in response to the modulation of the groove A of the record groove. When moved
along the trajectory in the direction of the arrow, the magnetomotive force or magnetic flux in
the coil 3a decreases to generate a voltage, which is used to generate the acoustic output of the
groove A.
In response to the movement of the permanent magnet's magnetic pole along the orbit shown by
the arrow in FIG. 13, the same reduction of the magnetomotive force or the magnetic flux also
occurs in the coil 3bK, whereby it is preferable that crosstalk occurs. I will not write anything
that I do not have. A magnetic compensator 6 is mounted on the iron core 2 between the two
flow generating coils 3a and 3b to prevent such a reduction of the magnetomotive force or the
magnetic flux in the coil 3b. This magnetic compensator 6 is a magnetic sensor,% m'i 4. On □ o,
work, 5. . Extending from j-toward the permanent magnet, a flux path is formed between the iron
core and the magnet. The permanent magnet 4 has two poles at both ends, and when one pole
moves toward the pole piece, the other pole is magnetized. As the magnetic pole moves toward
the magnetic compensator, or vice versa, the other magnetic pole moves toward the magnetic
pole piece so that the other magnetic pole moves toward the pole piece and is mounted at the
midpoint between both ends . Therefore, when one pole 1 [111111] EndPage of the magnet 4
moves in the direction of the arrow in FIG. 13 in response to the modulation of the sound 111A,
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the current generating coil 3b of the groove B is substantially There is no decrease in
magnetomotive force or magnetic flux. Similarly, when one of the magnetic poles of the magnet 4
moves relative to the pole piece 1b in response to the modulation of the sound groove B, the
magnetomotive force or magnetic flux decreases in the current generating coil 3b, and the coil
3aK has a magnetomotive force or magnetic flux There is no decline. The compensation of the
magnetic circuit is also obtained by means of a magnetic shield 9 arranged to surround the pickup assembly. The shield serves to prevent the pickup output from being disturbed by the weekly
current or stray magnetic field. Furthermore, in order to obtain magnetic compensation and to
prevent crosstalk between the rain grooves, the shield 9 is extended in an inductive relationship
with respect to the two pole pieces 1a and 1b. FIG. 13 shows the resistors 7a and 7b connected
respectively to the current generating coils 3a and 3b, which represent the load applied to the
circuit when the pickup is connected to the amplifier or amplifier system. It has been found that
loading the active sound groove results in a phase shift back to the magnetomotive force or
magnetic flux of the magnetic circuit, thereby interfering with the compensation of the circuit
and resulting in crosstalk. To compensate for this phase shift and to prevent crosstalk K is
provided with a phase compensator in the form of a closed coil or ring 8 surrounding the
magnetic compensator 6. The phase compensator should be formed of a conductive nonmagnetic
material, and copper, bronze, brass and the like have been found to be extremely satisfactory as
such a material.
By designing the phase compensator 8 so that the impedance triangle of the phase compensator
is geometrically similar to the impedance triangle of the load circuit, it is possible to prevent or
minimize the crosstalk caused by the phase shift. it can. The effective variable can be controlled
by changing the arrangement of the magnetic shield 9 by various mechanisms in this manner,
that is, by the magnetic compensator 6 and by the phase compensator. Other factors may also be
used to obtain complete control compensation for the active variable, 7 for example, the shape of
the outer end of the magnetic compensator may be changed. The shape of the outer end may be
a flat outer edge surface as shown, or it may be v-shaped, even if the angles of both sides of the
μV-shaped notch are changed. Alternatively, the outer end may be convex or concave. The same
angle between the two pole pieces 1a and 1b may be changed to relative [111111]. In
commercial 45 ° -450 stereo records, both sides of the sound groove are generally 90 ° to
each other and each side is 45 ° to the horizontal axis of the record. However, if the end face of
the compensator 6 is flat as shown, better compensation can be obtained if the relative angle
between the pole pieces 1a and 1b is larger than 90 °, such as 100 ° or 110 °. Was found to
be Similarly, changes in control can be achieved by moving the ends of the shield 9 closer to or
farther from the pole pieces 1a and 1b. The permanent magnet moves at one end towards the
compensator and at the other end towards one of the pole pieces, or vice versa, one end towards
the pole piece and the other towards the compensator Thus, it pivots at its midpoint as described
above. Control can be further varied by changing this pivot point relative to the pole pieces. By
using and changing each of these control factors, it is possible to obtain the maximum power of
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the effective tone groove and to prevent or minimize the so-called silent tone groove response. As
apparent from the description of FIG. 13, according to the present invention, the structure is
simplified, the assembly and production costs are low, the number of parts is small (and it is
novel that exhibits excellent performance without crosstalk). A stereo sound magnetic pickup is
obtained. As described above, FIG. 13 is a schematic diagram for describing the present invention
in detail, while FIG. 1-12 is an embodiment of the present invention in the form of a single-sided
pickup cartridge, and FIGS. The figure shows an embodiment in the form of a two-sided pick-up
cartridge.
In any of the embodiments, a support structure, a magnetic circuit, a current generator, a moving
device, a magnetic compensator, and a phase compensator are provided. The support structure in
the embodiment shown in FIGS. 1-12 comprises a plastic casing 15 and a shielding sheathing 16
arranged to surround the exterior of the cartridge and most of the magnetic assembly therein.
The plastic casing 15 is formed integrally by a method such as molding with a good [111111]
EndPage: 3 insulating plastic material such as polyethylene, polypropylene, polystyrene or vinyl
polymer, or vinyl copolymer, for example. desirable. As shown in FIGS. 2, 4.5 and 6, this plastic
casing 15 is open at the top and has a pair of opposed side walls connected together, a bottom
wall and a front wall. The rear end of the plastic casing 15 is closed by a terminal block 17 which
is connected to the casing body by a hinge 18 between the lower end of the block and the bottom
wall of the casing. For example, the terminal bins 20.21.22 and 23 formed of a conductive
material such as copper, bronze or brass may be embedded integrally when the terminal block
17 is formed. The construction of the terminal block 17 hinged to the casing 15 also simplifies
the manufacture and assembly of the pickup. The casing 15 and the block 17 may be integrally
formed. Since the casing and the block are integrally connected by the hinge, they can be
handled and counted as one piece. The assembly operation is facilitated by inserting the core, coil
and pole piece subassembly into the casing while holding the block in the open position as
shown in FIG. A lead wire extended from the coil is connected to the terminal bin while keeping
the block in the open position. After assembling the parts and connecting the leads in this way,
the one-open terminal block is closed by pushing it into the open end of the casing. For this
purpose, as shown in the drawings, a step is formed between the inner edge of the terminal block
and the front end of the inner surface of both side walls of the casing to fit the step of the block
into the casing step and hold the block in the closed position. Make it Furthermore, the terminal
block can be fixed in the closed position by heat sealing, solvents or adhesives. The plastic casing
15 is divided by a lateral flange or wall 25 into a front compartment 26 and a rear compartment
27. The front compartment 26 accommodates the subassembly of the iron core, pole pieces,
magnetic compensator and current generating coil.
The terminal bins 20-23 are projected into the rear compartment 27 and connected to the coil
lead wires in this compartment. A removable transfer device is inserted into a socket-like slotted
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opening 28 formed in the front and lower side walls of the plastic casing to project. In the front
compartment 26 of the plastic casing, the socket-like opening 28 opens into the interior of the
casing. In the [111111] rear compartment 27, the lower wall of the casing is thickened to form a
covering 29 which covers the removable transfer device. The shield or shield casing 16 is formed
of a high permeability or low magnetoresistance material such as, for example, iron, nickel or
alloys thereof. The casing 16 is provided with a pair of side walls, a top wall and a bottom wall,
and a front wall, and the shield casing is sized to slide-fit the plastic casing 15 containing the
wedge component into the pickup. Further, on the front wall of the shield casing 16, a small
opening 30 is formed which is aligned with the socket-like opening 2B when the plastic casing
15 is inserted. By doing so, the removable transfer device can be inserted into the socket-like
opening 28 through the opening 30. As shown, the clip 31 is attached to the upper surface of the
shield casing by means such as welding or brazing. The clip 31 has screw receiving recesses 32
on both sides and serves to attach the pickup to the charge or tone arm of the record player. As
described above, a subassembly having a magnetic device and a current generator is disposed in
the front compartment 26 of the plastic casing 15. This subassembly is shown as a unit in FIG. 3
and its components are shown disassembled in FIG. The subassembly has an iron core 34 and
pole pieces 35a and 35b having holes for receiving both ends of the iron core, respectively. The
iron core 34 and the pole pieces 35a and 35b are formed of a magnetic material having high
magnetic permeability, that is, low magnetic resistance, such as soft iron, nickel or an alloy
thereof. The pole pieces extend downwardly and the pole pieces form inwardly directed
extensions which terminate in a downwardly sloping portion. The permanent magnets of the
displacement device are located between the inclined ends of the pole pieces and spaced apart
from them. The iron core and the pole pieces form a primary magnetic circuit together with the
permanent magnet, which correspond to the pole pieces 1a and 1b and the iron core 2
schematically shown in FIG. A pair of current generation coils 36a and 36b are disposed adjacent
to both ends of iron core 340, respectively.
These coils correspond to the coils 3a and 3b of FIG. The coil leads 37, 38, 39 and 40 '□ are
placed on either side of each coil as shown, and the start leads are identified by small tabs as
shown. Connect these leads to the terminal bins appropriately [111111] EndPage: 4. As shown in
FIG. 9, the lead 37 is connected to the terminal bin 20, the lead 38 to the terminal bin 21, the
lead 39 to the terminal bin 22, and the lead 40 to the terminal bin 23. Further, a magnetic
compensator 42 formed of a magnetic material having high magnetic permeability and low
magnetic resistance such as soft iron, nickel or an alloy thereof is attached to the iron core 34 in
the middle of the both chamber flow generation coils 36a and 36b. . The magnetic compensator
42 has a hole for passing the iron core 34 as shown. In order to prevent the iron core from being
pulled out of the magnetic compensator, the iron core is tightly fitted in the hole of the magnetic
compensator. The core 34 extends towards the permanent magnet of the mover to a point
slightly spaced therefrom to establish a good magnetic path between the core and the magnetic
compensator. In the lower part of the magnetic compensator, grooves 43 are formed on both
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sides in order to attach the phase compensator 44 so as not to fall off. The phase compensator
44 is in the form of a loop or coil formed as a closed circuit, for example made of a conductive
nonmagnetic material such as copper, bronze or brass. The phase compensator may be a singleturn member or coil as shown. Thus, the magnetic subassembly has the pole pieces 35a and 35b
fixed to both ends of the iron core 34, and the current generating coils 36a and 36b disposed
adjacent to the both ends. Further, a magnetic compensator is inserted between the current
generating coils in the iron core and extended toward the moving device to set a magnetic path
between the iron core and the extension magnet. A phase compensator 44 is attached to the
porcelain compensator to compensate for the phase shift that occurs when the circuit of the
current generating coil of the active tone groove is load loaded. The magnetic and current
generating subassembly is inserted into the front compartment 26 of the plastic casing 15 so
that the downwardly sloping portions of the pole pieces are located on either side of the slotted
opening 28 in the bottom wall of the casing. A grounding strap 45 is extended between the
subassembly's magnetic circuit and the shield casing 16, which secures the grounding strap to
the front wall of the magnetic compensator and extends upward at a set angle and backward as
well. Achieved by. When the shield casing 16 is slip fitted onto the plastic casing 15 containing
the subassembly, the upper end of the ground strap is engaged with the top wall of the shield
casing.
The ground strap is formed of an elastic conductive [111111] non-magnetic material such as
copper, bronze or brass. When inserting the subassembly into the front compartment of the
plastic casing 15, the terminal block 17 is held in the open position as shown in FIG. The leads
37-40 of the current generating coil are then suitably connected to the inner ends of the terminal
bins 20-23, respectively, as described above. The terminal block is then lifted and frictionally
engaged to the inner surface of the plastic casing and held in place and sealed with a suitable
adhesive or heating if desired. Finally, the shield casing is slip fitted onto the plastic casing to
assemble both casings so that the opening 30 is aligned with the opening 28. After the cities of
the pick-up cartridge are assembled in this way, the transfer device is inserted from the opening
30 of the shield casing into the opening 28 of the plastic casing, the tubular casing of the
transfer device is shown in FIG. It is inserted between the downward inclined end and the lower
end of the magnetic compensator and is thereby held in a frictional engagement manner. The
transfer device comprises a tubular casing 46 and a plastic or resin handle 47 mounted at its
outer end as shown. A needle 48 of a hard material such as diamond or other gem is suitably
supported by a support device located inside the tubular casing 46 and protrudes outwardly
from the front end of the tubular casing so that the needle 48 engages in the groove of the
record. And vibrate in response to the modulation of the two sound grooves. The support device
of the illustrated embodiment comprises a permanent magnet 49 connected to the needle 48 by
means of a tip tube 50 of a sinuous magnetic material, for example aluminum. Between the
magnet 49 and the tubular casing 46, a spacer and shock absorber such as a collar 51 formed of
a relatively low-elasticity flexible material such as rubber or synthetic rubber is fitted on the
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magnet to form a permanent magnet. The assembly of the aluminum tube 50 and the needle 4B
is made to vibrate in response to the modulation of the recording sound groove. The magnet and
needle of the transfer device should be exactly centered between the pole pieces and always kept
exactly in the center position by means of the non-magnetic spring metal 52 made of
nonmagnetic spring metal such as copper, bronze, brass, beryllium copper etc. . The wire 50 is
extended between the casing 46 and the permanent magnet 49. The inner end of the wire 50 is
inserted under the slotted clip 53 integrally formed with the inner end of the tubular casing 46
and then extends forward between the aluminum tube 50 and the permanent magnet. [111111]
EndPage: 5 Bent Wire 520 Front end embedded in plastic or resin filler placed in aluminum tube,
or properly fixed directly to permanent magnet.
The wires 52 may be disposed on the upper and lower sides of the permanent magnet. However,
placing the wire on the underside of the permanent magnet provides good tracking and low
strain characteristics, as well as reducing the cartridge's regeneration angle with respect to the
record surface, so placing the wire on the underside of the magnet Is desirable. Permanent
magnets must have high strength and high magnetic flux density, for which iron-aluminium
alloys, in particular high coercivity such as, for example, "Alnico, irons such as fi gold alloy,
cobalt, nickel, etc. Preferably, they are formed of aluminum and copper-containing alloys. The
spacing between the tubular casing and the assembly of permanent magnet, aluminum tube and
needle is also such that the displacement device can freely vibrate in response to the modulation
of the recording sound groove without contacting the tubular casing. A recess 54 as shown may
be formed on the surface of the tubular casing so that the moving device can be accurately
positioned. The wire not only keeps the needle assembly in its correct center position, but also
serves to keep the needle in an upright position. The diameter of the tubular casing 46 is such
that it can fit through the socket-like opening 28 between the pole pieces 35a and 35b and the
magnetic compensator 42, as shown in FIGS. Thus, the moving device is correctly oriented and
positioned with respect to the pole piece and the magnetic compensator. A plastic-ndole portion
47 is also formed to orient and position the transfer device relative to the pole piece so as to
engage the surface of the casing. The plastic handle 47 is thus secured to the outwardly
diverging front end of the tubular casing 46 and extends upwardly therefrom at the same angle
as the front sidewall of the shield casing, as shown in FIGS. The back of the plastic shell engages
with the front of the shield casing when the transfer device is installed. Also, at the very end of
the plastic handle, there is a rearwardly-projecting wedge-shaped portion that overlaps the front
upper surface of the shield casing, thereby further orienting the transfer device and holding the
needle in the upright position device. The modified plastic handle 47a shown in FIG. 12A is not
extended to engage on the top surface of the shield casing that engages with the front wall
[111111], but instead spans the entire width of the casing It has a pair of wedge-shaped portions
which extend laterally and overlap the side walls of the casing. In the above-described
embodiment, the moving device is accurately determined by the interengagement between the
rear side wall of the plastic handle and the front side wall of the casing and the overlapping
01-05-2019
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relation of at least one of the other side walls. Orient and position.
Also, in any of the n-bars 47 and 47a, the lower surface thereof is provided with an appropriate
four portion 55 communicating with the inside of the tubular casing 46 and the moving device,
and the lower end of the needle is below the lower surface of both side walls of the recess 55.
And thereby allow the needle to engage with the record groove. However, since the moving
device is elastically mounted, the moving device moves upward into the recess 55 to record when
the needle is impacted as when, for example, the tone roller or the frame is dropped onto the
record. The main impact only acts between the plastic hurdle and the record. The front wall of
the plastic handles 47 and 47a is also provided with a trough recess 56 extending from the top
surface of the handle to the recess 55. The front end of the transfer device is located below the
four portions 56 so that the front end is visible from above the pick-up cartridge, so that the
needle can be correctly engaged in the sound groove of the record. When the entire removable
moving device is inserted into the pick-up cartridge, the permanent magnet is moved so that
when one pole or end of the magnet moves towards one pole piece, the other end of the magnet
moves towards the compensator It is located between the two pole pieces 35a and 35b. The pickup cartridge shown in FIG. 1-12a operates in the same manner as the device schematically shown
in FIG. Thus, as the magnet and needle assembly vibrates in response to the modulation of the
groove A of the record, the magnetic poles of the magnet approach and move towards the lower
sloped end of the pole piece 35a. As a result, the magnetomotive force and magnetic flux are set
in the current generating coil 36a to generate current in the coil and the circuit connected
thereto. Because of the provision of the magnetic compensator 42, the magnetomotive force or
magnetic flux of the coil 36b does not change, so that no current is generated in the coil.
Connecting a load in the form of a preamplifier or amplifier [111111] EndPage: 6 to the coil 36a
of the effective groove results in a phase shift in which the magnetomotive force of the magnetic
circuit is fed back to the magnetic flux, thereby causing the circuit to Compensation is
interrupted. The phase compensator 44 compensates for such phase shift to prevent or minimize
crosstalk. As mentioned above, the position compensator 44 should be in the form of a coil or
loop of conductive non-magnetic material and having a closed path. In order to prevent crosstalk,
geometrically, the impedance triangle of the phase compensator must be identical to the
impedance triangle of the load circuit. In circuits with resistance and impedance, it is an
impedance triangle, the base of which is determined by the resistance value in ohms, and its
height is given by the formula 2πFL, where F is the frequency of the sand cycle, L Is determined
by Henry's inductance).
The angle between the hypotenuse and base of the right triangle represents the phase shift.
When the needle and magnet assembly vibrates in response to the modulation of the groove B,
the magnetic poles of the magnet move away from the drooping inclined end of the pole piece
35b to generate a magnetomotive force or magnetic flux in the current generating coil 36b. A
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current is generated in the coil and the circuit connected to it. The magnetic compensator 42 and
the phase compensator 44 operate in the same manner as in the case of preventing crosstalk in
the coil 36a. In using the pick-up shown in FIG. 1-12A, it is first assembled as described above
and screwed into the slot 32 of the clip 31 and attached to the tone arm. As shown in FIG. 11, the
ground strap 58 is attached between the terminal pin 22 and the shield casing. The “one
active” lead wire of the sound groove A amplification system is connected to the terminal pin
21, and the ground lead wire of the sound groove A is connected to the terminal pin 20. The
active lead of the sound groove B amplification system is connected to the terminal pin 23, and
the ground lead is connected to the terminal pin 22. Once so connected, the cartridge can be
used in the same manner as a conventional cartridge to engage the needle in the groove of the
stereo record to produce a stereophonic output with high fidelity and response characteristics.
The pick-up cartridge described above is a so-called single-sided type], and the pick-up is
designed for a record disposed on the ninger side of the cartridge. The present invention is also
applicable to stereophonic sound magnetic pickups used for records arranged on both sides of
the cartridge. That is, FIG. 14-19 shows an embodiment of the m-side weir pickup cartridge
according to the present invention using only a pair of current generating coils operated by a
moving device disposed on either side of the pickup. The cartridge has an inner plastic or resin
casing and an outer shield casing. The inner casing is formed, for example, of a resin or plastic
having good insulating properties such as phenyl formaldehyde resin or relatively hard
polystyrene, polyethylene, polypropylene or polyvinyl resin. The plastic casing 60 comprises two
mirror-image identical parts 60a and 60b. The separation line between the tube structure parts
extends along the center of the casing mark. In the casing parts 60a and 60b, a front
compartment 61 is formed, which accommodates the subassembly of the magnetic circuit and
the current generator, respectively. Also, a rear compartment 62 is formed to project terminal
pins from each casing component and to provide connections for these pins.
Both the front and rear compartments are connected by a slot 63 through which the coil paste
line passes. The terminal pins 64, 65, 66 and 67 are respectively projected from the outer
diameter side of the casing into the rear compartment of each casing component. Each casing
component is also provided with a forward facing socket opening 6B and a socket groove 69 on
one side of the casing for receiving one of the moving devices. Also, on the opposite side, there is
formed a rearward-facing socket opener 0 communicating with the socket groove 71 to receive
the other moving device. After assembling the magnetic and current generating sub-assemblies
to be described later and inserting them into the front compartments of both casing parts and
connecting the lead wires of the current generating coil to the terminal pins 64-67, both casing
parts are centered. Engage along the separation line. These sections may be joined by heat or an
adhesive. Alternatively, the casing parts may be held in assembled relation by an outer shield
casing 72 which likewise consists of two parts 72a and 72b. The shield casing of this
embodiment is formed of a suitable magnetic material of high permeability, such as soft iron or
nickel or alloys thereof, as in the first embodiment shown in FIG. 1-12A above. The component
01-05-2019
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parts are arranged in the same mirror image but in opposite directions. One side of “R1” is
placed forward and upward, and [111111] EndPage: 7 is superimposed downward on the other
from above. Each component 72a and 72b is generally groove-shaped and has a pair of side
walls resiliently and frictionally engaged with the outer surfaces of both components of the
plastic casing when assembled, whereby both components of the plastic casing are Hold in
assembly relationship. The component parts of the shield casing also have a joining stepped
outer wall having an intermediate beveled portion 73 which engages with the surface of the
component part of the plastic casing. The beveled portion 73 is provided with openings that
respectively align with the socket openings 68 and 70 of the plastic casing. Insert the tubular
casing of the transfer device through the openings into the socket opening of the plastic casing.
When components of the shield casing are fitted from both upper and lower sides of the
assembled plastic casing, those components act as clips to hold the plastic casing components in
an assembled relationship. If desired, the plastic casing components may not only be held by the
shield casing components, but may also be joined together by heat or adhesive as described
above.
The dual sided magnetic and current producing subassembly is shown schematically in FIG. 13
with the cartridge and 1-12A shown except that the pole pieces and magnetic compensator
extend outwardly in both directions on either side of the cartridge. Example 1 is similar to the
first example. The pole pieces provide two pairs of spaced-apart magnetic poles, each forming a
cap on either side of the cartridge, with a separate removable transfer device inserted in each
gap. The same current generating coil pair generates the outputs of both moving devices.
Referring to FIGS. 15.16 and 17, two current generating coils 76a and 76b are disposed adjacent
to both ends of the iron core 750, respectively. A hole is made in the center of each of the two
pole pieces 74a and 74b, whereby the iron core 75 is fitted from both sides. The pole pieces 74a
and 74b are attached to the core at their central portions and project outwardly towards the
sides of the cartridge and terminate at the inclined poles 74at and 74a2 and 74b1 and 74b2,
respectively. Thus, the gaps on one side of the magnetic pole 74a1 and 74a2kZ cartridge are
formed, and the gaps on the other side are formed in the magnetic pole 74b1 and 74b2. A
magnetic compensator 82 is mounted between the two chamber flow generating coils on the iron
core, and both ends thereof are extended from the iron core toward the gap and the moving
device in the gap in opposite [111111] directions, respectively. The core, pole piece and
magnetic compensator are all formed of a material having high magnetic permeability or low
magnetoresistance such as soft iron or nickel or an alloy thereof. Adjacent to both ends of the
magnetic compensator 820, phase compensators 83 and 84 similar to the phase compensator of
the first embodiment are respectively disposed. Each of these compensators is formed of a
conductive nonmagnetic material such as copper, bronze or brass in the form of a closed loop.
The function of the phase compensator serves to compensate for the phase shift caused by
connecting the load in the form of the amplifier to the coil of useful acoustics, as described for
the first embodiment. Also, as mentioned above, the impedance triangle of the phase
01-05-2019
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compensator must be geometrically equal to the impedance triangle of the load circuit. The
magnetic compensator exerts the same function to the magnetic circuits on both sides. That is,
the magnetic compensator acts to prevent the magnetomotive force or magnetic flux from
flowing through the current generating coil of the effective groove, thereby preventing the
occurrence of crosstalk. The current generating coil 76a has two leads 77 and 78 which extend
through the slot 63 to the rear compartment 62 [-] to suitably connect to the terminal bins 64
and 65 in that compartment .
Similarly, reet's 79 and 80 of the current generating coil 76b are also extended to the
compartment 62 through the slot 63 and connected to the terminal pins 66 and 67 respectively
in the compartment 0. Transfer devices 85 and 85 'are provided, which are inserted into the gap
such that the permanent magnet is in an inductive relationship with the end of the pole piece
through the opposite socket openings 68 and 70 of the cartridge, respectively. The transfer
device 85 is inserted from the front side of the cartridge into the socket opening 68 and is
inserted from the rear side of the transfer device B5'c-i cartridge into the open lower 0. Each
transfer device has a tubular casing 86 made of copper, bronze, brass or aluminum and a plastic
handle 87 mounted at its outer end. The plastic holder 87 has a surface which engages with the
surface of the cartridge when the transfer device is fully inserted, the surface having a shape
corresponding to the stepped outer surface of the shield casing components 72a and 72b, The
needle and mover are precisely oriented and positioned with respect to the pole piece and the
record surface. [111 111] EndPage: 8 The transfer device also includes a needle 88, which
projects outwardly through a hole drilled in the outer surface of the plastic ladle so as to engage
with the record sound groove. The needle 88 can be made of hard material such as diamond or
other gems. This is connected to a permanent magnet 89 similar to that of the first embodiment
and vibrated with it by a tube 90 formed of a lightweight non-magnetic material such as
aluminum. The transfer device is disposed within the tubular casing 86 by a collar 91 interposed
between the transfer device and the tubular casing so as to be formed of rubber or synthetic
rubber to act as a spacer and cushioning member. A lower wire 92 extending between a clip 39
formed at the inner end of the tubular casing 86 and the front end of the magnet accurately
centers the transfer device relative to the pole piece and holds it in its centering position Work.
As shown, the wire is extended between the aluminum tube 90 and the front end of the magnet
so as to be held in place. As in the case of the first embodiment, a suitable nonmagnetic wire such
as beryllium, copper or bronze is desirable as the stay wire. As described above, the transfer
device 85 is inserted from the front end of the cartridge into the socket opening 68 and from the
rear end of the transfer device 85 into the socket opener 0. When these moving devices are fully
inserted into the socket openings, the surface of the noodle 8T engages the corresponding
surfaces of the shield casing components 72a and 72b, as shown in FIG.
In this engaged position, the permanent magnet is precisely located between the opposite ends of
01-05-2019
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the pole piece pair and the needle projects outwardly from the hole of the rod at the correct
position to engage the sound groove of the record. The needles on either side of the cartridge
may have different radii, or both may be of the same type, so as to engage with different stamped
grooves in the records, which are rotated at different speeds. There is no problem with things. In
either case, needless to say, the needles on both sides of the cartridge do not engage
simultaneously with the two records, but instead engage with one of the records. The two-sided
stereophonic sound pickup cartridge is properly grounded to remove the hum. This cartridge can
also be connected to a stereophonic sound amplifier by connecting the terminal bins 64 and 65
to the lead of one sound groove and the terminal bins 66 and 67 to the lead of the other sound
groove [111111]. Absent. Each side of the cartridge is used as in the first embodiment described
above. Also, each side of the cartridge operates in the same manner as in the first embodiment to
exhibit the same function. In this double-sided cartridge embodiment as well as the first
embodiment, a control device is provided for the magnetic device. That is, the magnetic
compensator and the phase compensator are also provided in this embodiment, and the shield
casing is extended so as to be in an inductive relationship with respect to the pole piece. Further
control objectives can be achieved by changing the angle of the sloping ends of the pole pieces
and changing the shape of each end of the compensator. In any of the cartridge embodiments
described above, if the needle is damaged or worn, the transfer device can be removed from the
cartridge and easily replaced with another transfer device. It is also possible to replace the
moving device with a needle having a fixed radius with the moving device with a needle with
another radius. For that purpose, the plastic handle may be colored to indicate the embossing of
the needle. As described above, the pickup of the stereo record according to the present
invention is composed of a minimum of t parts and is easy to assemble or assemble, the pickup
has small volume and mass, and therefore the manufacturing cost can be reduced. The pickup of
the invention has a high degree of fidelity and response characteristics and sets a clear boundary
between the active and the silent grooves, thereby preventing crosstalk between the rain grooves.
Although the present invention has been described in detail with reference to specific
embodiments, the present invention is not limited to these embodiments only (therefore various
modifications may be made without departing from the spirit of the present invention). It goes
without saying that it can be a variation of
(1) A device for providing a magnetic circuit of a magnetic body comprising a support structure,
an iron core and a pair of pole pieces attached respectively to both ends of the iron core and
supported by the support structure, A pair of current generating devices comprising a pair of
coils mounted in spaced relation to an iron core, and a magnetic member supporting a record
hook needle and the needle, the magnetic member being in contact with or separated from the
pole piece Moving between the pole pieces, and extending from the front [111111] EndPage: 9
iron core toward the magnetic member of the moving device between the coil pairs. Magnetic
pick atre 11 of a stereo record comprising a phase compensator in the form of a non-magnetic
coil mounted on a low reluctance [111 111] rl 111 111 air compensator between the iron core
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and the magnetic member 11] [1111113EndPage: 10
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