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JPS523282

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DESCRIPTION JPS523282
■ Needle structure of a three-dimensional sound pickup cartridge 特 願 Japanese Patent
Application No. 51-28654 [Phase] Application No. 42 (1967) June 20, Japanese Patent
Application No. 43-53490 for division 0 Inventor Nemo Michio Machida City Crane 1 of 5 5
same Honma Kokoshi Machida City Naruse 2206 @ Applicant Audio-Technica Co., Ltd.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view illustrating a 3D sound
pickup cartridge according to the present invention, FIG. 2 is a magnetic circuit of the 3D sound
pickup cartridge shown in FIG. 1, FIG. 3 is shown in FIG. FIG. 4 is a cross-sectional view showing
an embodiment of the three-dimensional sound pickup cartridge according to the present
invention, and FIG. 5 is a perspective view of the needle assembly shown in FIG. It is.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a threedimensional sound pick-up cartridge which simultaneously reproduces a multi-channel signal
from two modulation walls of a sound groove of a record board, more specifically, two
corresponding to each of the modulation walls The present invention relates to an
electromagnetic pickup cartridge having an independent armature. For an electromagnetic
pickup cartridge in which a single armature is fixed to a cantilever, several types are known
which differ in the arrangement of members of the magnetic circuit. According to Japanese
Patent Publication No. 39-26789, it is proposed to mount a columnar armature on an elastic
bearing in a tubular housing and place it in a shared working gap formed by two pairs of pole
pieces with the tubular housing. However, in this type of electromagnetic pickup cartridge, the
pair of pole pieces belonging to one channel [111111] and the other pair of pole pieces
belonging to the other channel are oriented very close to each other, and these gaps Because the
gap is smaller than the gap between each pole piece and the armature, crosstalk due to leakage
flux occurs in the magnetic circuit. In addition, since the vibration mode of the armature in the
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common gap is parallel motion with the surfaces of the pair of pole pieces corresponding to the
non-modulation channel, crosstalk is caused unless each pole piece surface is completely flat. It
has the disadvantage of becoming Another disadvantage of this type is that the force in the
direction of the groove travel applied to the cantilever tends to cause intermodulation distortion
from causing deformation of the elastic bearing. In order to eliminate the disadvantages of an
electromagnetic pickup cartridge having a single columnar armature, it is possible to use a single
armature having at least two lugs corresponding to the relative angle of the modulation wall of
the groove. No. 3,184,555, in which each pair of pole pieces cooperating with each lug forms a
separate working gap, as in prior U.S. Pat. No. 3,184,555. In this case, U.S. Pat. No. 3,184,555 is
proposed as a movable magnetoresistive type, and Japanese Utility Model Publication No. 4416756 simultaneously shows a movable magnet type, but these are the causes of the newly
generated crosstalk in any aspect. Could not solve. This crosstalk arises from where it is almost
impossible to make the magnetic fluxes passing through a pair of pole pieces in the unmodulated
channel relatively equal. This is because, in this type of electromagnetic pickup cartridge, one of
the protrusions is magnetized or biased so as to share the N pole and the other share the S pole,
so that each of these protrusions corresponds to each other. Each pair of pole pieces must be
connected to each other by a common yoke or permanent magnet.
To explain this in more detail, when only one of the protrusions cooperating with the pair of pole
pieces of one channel vibrates, this protrusion [111111] EndPage: one piece from the pair of
pole pieces of the other channel The magnetic flux flowing through the other projection is
alternately given to the pair of pole pieces of one channel, in which case as long as the equal flux
does not flow to the pair of pole pieces of the other channel, A voltage is induced in the coil
differentially wound on each of the side poles having a pair of pole pieces. However, it is
theoretically difficult to obtain such a perfect neutral state, and it should be taken into
consideration that the reluctance between each of the pair of pole pieces and the projecting piece
also differs depending on the change in needle pressure. For example, it is impossible from the
viewpoint of handling. SUMMARY OF THE INVENTION It is therefore an object of the present
invention to provide a three-dimensional sound pickup cartridge in which the above-mentioned
drawbacks of the conventional electromagnetic pick-up cartridge can be almost completely
eliminated. In particular, the object of the present invention is to provide a high-.. 3D sound
pickup cartridge in which the degree of signal divergence between channels without crosstalk is
high. Another object of the present invention is to provide a three-dimensional sound pickup
cartridge capable of reducing the special mass of the vibration system and increasing the high
frequency range resonance frequency. A feature of the three-dimensional sound pickup cartridge
according to the invention is that the back end of the cantilever has a magnetic axis
perpendicular to the axis of the same cantilever and also in the angular direction corresponding
to each of the two modulation walls of the recording groove to be reproduced. The two
independent armatures are fixed, and the cantilevers are supported so that each of the armatures
is substantially disposed on the oscillation fulcrum, and the corresponding six of the armatures
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are also mounted on the mountain by the comet Obka 9p The present invention is to provide an
electromagnetic generator having an independent magnetic circuit. According to the present
invention, the two armatures respectively belong to independent magnetic circuits, and the
magnetic flux flowing through one of the three magnetic circuits is not related to the other
magnetic circuit, so it is correctly proportional to the vibration amount of each armature
[111111 complete Can be prevented. The spacing between the pole pieces of the stereophonic
sound pickup cartridge [111111] pair according to the invention can be very small (as a result of
which the magnetic flux effectively derived from the armature significantly improves the
conversion efficiency in the coil). The invention will now be described in more detail according to
the embodiments shown in the drawings.
As apparent from FIG. 1, the three-dimensional sound pickup cartridge according to the present
invention comprises two pairs of pole pieces 1, 2 and 3 and 4 forming independent left and right
working gaps and coils associated with each of these pole pieces. It has an electromagnetic
generator including 5, 6 and 7, 8. Each pair of pole pieces forming each working gap is parallel
to each other, and the pair of pole pieces on one side is at an angle of 90 degrees to the pair of
pole pieces on the other side and in a vertical plane respectively It is bent to maintain a 45
degree tilt angle. Coils 5 and 6 are differentially connected in series, and coils 7 and 8 are
similarly connected, so that these two groups of coils are each separately sensitive to flux
changes in the left and right independent working gaps. It has become. In this embodiment, two
magnet armatures 9 and 10 are arranged to maintain proper orientation in each of the working
gaps. That is, on the rear end of the cantilever 120 extending backward from the needle tip 11,
these armatures 9, 10 are perpendicular to the axis of the cantilever and one armature-the other
armature so as to fit each of the working gaps. Form an angle of 90 degrees to In this case, each
of the armatures 9 and 100 is fixed to the same 1-mer I-ha J-J (pereled) 1-no-I-I-f 100 p-bars 13
without being fixed directly to the cantilever 12 . A suspension wire 14 supports the cantilevers
12 on these armatures, attomo, in order to orient the armatures 9.degree. 10, respectively, in an
appropriately positioned place (in each of the working gaps). The suspension sleeve 14 will be
described in detail later, but it is also possible that the suspension needle 4-11 1 is also included,
and the armature 11 and 9 are magnetized in the longitudinal direction so that the a * is a * + Ik
14. "EndPage: 2" forms a magnetic circuit of "'" and "'". Therefore, if the armatures 9 and 10
vibrate together with the needle tip 11, this armature arrangement [111111] b and (, 13 causes
the elder power generation to grow up. On the 45-45 system stereophonic sound recording
board, each channel is recorded at two modulation walls cut at an angle of 45 degrees from the
horizontal plane of the dial surface and at an angle of 90 degrees to the other channel. ing. Thus,
according to the above-described three-dimensional sound pickup cartridge according to the
present invention, when the needle tip 11 is disposed only in the sound board, one modulation
wall moves the needle tip in a direction perpendicular to the modulation wall, for example. As a
result, one of the armatures 9 vibrates in the axial direction of the cantilever 12 about the
fulcrum of the vibration system.
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Then, the magnetic flux of the armature 9 induces a voltage in the coils 5 and 6. However, in this
case, since the vibration of the needle point 11 is a rotational movement for the other armature
10, the working gap in which this armature is placed does not cause a change in magnetic flux,
and therefore, in the other coil 7.8. No current is induced. Other channels recorded on the
modulation wall opposite the groove move the stylus 11 in a direction perpendicular to the
modulation wall. Therefore, only the armature 10 vibrates in the axial direction of the cantilever
12 and a voltage is induced in the coil 7.8, but no voltage is generated in the other coils 5, 6. In
actual operation, the needle point 11 acts simultaneously by both channels, so that the two
armatures 9, 100 movements are very complicated. Nevertheless, two separate signals emanate
from each of the coils, as the separate left and right coil sets are more sensitive to only one
channel component which imparts flux changes to their pole pieces. FIG. 2 shows the entire
magnetic circuit of the three-dimensional sound pickup cartridge according to the invention, but
it is clear from this figure that the left and right channels have circuit arrangements which are
independent of one another. In this drawing, ML represents the total flux of the armature of the
left channel, and MR represents the total flux of the armature of the right channel. However, the
magnetic resistances corresponding to the left and right channels are otherwise given the same
reference numerals. The position where each magnetic resistance exists is apparent with
reference to FIG. 3, but R1-R4 is an interlocking variable resistance of the rllllll operation gap
between a pair of pole pieces, R6 and R7 are magnetic materials of the coil mounting portion of
the core The fixed resistance of RY is the yoke hbhhbti * h anti. Also, φ1 and φ2 represent
magnetic fluxes passing through the coil mounting portion. According to the present invention,
as described above, each channel has a theoretically independent magnetic circuit, and the
distance between the pair of pole pieces is extremely smaller than the distance between the other
channel and the pair of pole pieces. It is practically impossible to connect a pair of pole pieces of
both channels with a common yoke (dotted line in FIG. 2). FIG. 4 is a cross-sectional view
showing an embodiment of a pickup cartridge according to the present invention. A casing 25
with a cover plate 37 has at its rear a separate terminal board 63 mounted, which has a terminal
64 for sending to the reproduction signal amplifier. The electromagnetic generator of the
transducer has two separate magnetic cores which are arranged alongside one another on both
sides of the housing 25.
Although it is not possible to see one side of the channel in this figure, the core corresponding to
one of the channels is completely shown. The core has side poles 39.40 extending from the yoke
38, each of which ends in a pole piece 41,42. In this case, the pole piece 4L42 is bent toward the
other magnetic core side, and the angle is maintained at 45 degrees with respect to the vertical.
A pair of coils 43 and 44 are wound on the side poles 39 and 40 and are differentially connected
in series to produce an induced voltage. The other magnetic core is also formed in the same
manner. Each of these pole pieces is embedded in resin block 51 to facilitate assembly of the
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cartridge and to permanently maintain the correct orientation of the pole pieces. However, in this
case, an operating gap is left between each pair of pole pieces. The resin block 51 occupies a
considerable space in the casing 25 and it also has a socket 52 into which the needle assembly
(FIG. 5) is to be inserted. A magnetic shield consisting of an outer shell 36 is fitted in the casing
25 so as to surround the electromagnetic generator and also cover the resin block 51. In this
cartridge, the needle assembly can be easily attached to the cartridge body so that the magnet
armature is positioned at the correct position within the working gap. In order to fix the needle
assembly at a predetermined position, a columnar portion 53 [111111] EndPage: 3 formed on
the knob 28 is fitted in the socket 52. In this case, the post 53 has a slot 54 in its axial direction,
which provides a spring action so that it can not easily come off the socket 52. The proper
positioning of the magnet armature in the working gap with the knob 28 fitted in the socket 52
is better shown in the drawing. Although only one magnet armature 31 appears in this figure, the
other magnet armatures are similar. At the back end of the cantilever 29, these magnet
armatures are transmitted vibration from the tip 30 at the tip of the cantilever, resulting in a
change of magnetic flux in the pair of pole pieces forming the working gap. FIG. 5 shows the
appearance of the needle assembly. The knob 28 comprises a bottom wall 55 and two side walls
56, 57, with a post 53 on the bottom wall. In addition, the front end on the bottom wall 55 has a
semicircular raised portion 58. A damper 34, a magnet support 33, and a cantilever 29 are
disposed side by side forward from the raised portion 58.
The cantilever 29 is formed in a tubular shape from a nonmagnetic metal, for example,
aluminum. The rear end of the tubular cantilever 29 is firmly adhered to a suspension wire 35
(FIG. 4). The suspension wire 35 is made of a metal material, for example, a low stretchability
good material such as a very thin piano wire, and extends long from the back of the cantilever
29. However, the mounting vibro 1 is coated on the pole (the part reaching the close position) at
the rear end of the cantilever 290. The mounting vibro 1 is fixed to the knob 28. As a result, the
fulcrum of the vibration system is set on the suspension wire 35 between the mounting vibro 1
and the cantilever 29. Placing the magnet armature substantially on the fulcrum of the vibration
system is one of the features of the present cartridge. It is the magnet support 33 that actually
mounts each of the magnet armatures on the cantilever 29. The magnetic support is made of
synthetic resin, for example, cast resin such as ABS. In the case of multiple (in case of casting and
casting, the magnet armature 31. 32 may be partially embedded in the magnetic support 33 so
as to permanently maintain its proper orientation. The cantilever 29 is fitted on the axis of the
magnetic support, and the magnetic support 33 is firmly held by the cantilever. In this case, the
magnet support 33 is provided with a hole 60 through which the suspension wire 35 extending
from the cantilever 29 passes. The knob 28 may be made of synthetic resin. The knob has a
socket which penetrates from its raised portion 58 to the rear side of the column portion 53 and
the mounting vibro 1 is fitted in the socket of the bracket. The knob also has a threaded hole in
the direction perpendicular to the socket and has a set screw 62 screwed into this threaded hole.
The set screw secures the mounting vibro 1 in the socket in place. Disposed between the magnet
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support 33 and the knob 28 is a damper 34 which cooperates with the suspension wire 35 to
support the entire vibration system and provide them with a damper effect. The damper may be
an elastic material, for example, a rubbery material such as butyl rubber. When the mounting
vibro 1 is fixed in the socket of the knob 28, by adjusting its fixing position, the tension of the
suspension wire 35 can be freely adjusted, thereby supporting the whole vibration system in the
best condition.
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