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JPS5769998

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This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
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DESCRIPTION JPS5769998
Description 1, title of the invention
Electromagnetic pickup cartridge
3. Detailed Description of the Invention The present invention relates to an electromagnetic pickup cartridge and its object is to record the velocity amplitude of each of the two modulation walls
in the mutually independent magnetic circuit. The object of the present invention is to provide an
electromagnetic pickup cartridge capable of improving the separation by vibrating a pair of
independent armatures correspondingly. Generally, several systems are known for
electromagnetic pickup cartridges. In the case of an electromagnetic big ag cartridge in which a
single armature is fixed to a cantilever, as shown in FIG. 1 and FIG. 2, a rod-like armature 3 in the
longitudinal direction of the cantilever 2 is attached to the other end of the cantilever 2 having a
squealous tip 1 at its tip. Mounting, this armature 3 is supported at the fulcrum 4 by a damper 4
made of an elastic material, and together with the damper 4 are arranged in a common gap
formed by two pairs of pole pieces 5, 6 and 7.8 . Assuming that a 45-45 stereo record is played
on this type of BICK UP cartridge, it is assumed that the armature 3 operates at right angles to
the end strips 13 and 14 with the pole pieces 6 and 7 corresponding to the velocity amplitude of
the stylus tip 1. A magnetic flux change occurs between the pole pieces 6, 7 and an electrical
output signal can be taken from the output terminal 14 of the coil 12 through the yoke 10. At
this time, since the movement of the armature 3 with respect to the pole piece 6.degree. 8 moves
in parallel with the pole pieces 6, 8, no change in magnetic flux occurs, so no electrical output
signal is generated at the output terminal 13 of the coil 11. However, in this type of
electromagnetic pickup cartridge, the pair of pole pieces 6.7 belonging to one channel and the
pair of pole pieces 5.degree. 8 belonging to the other channel are disposed extremely adjacent to
each other, and Since the gap is smaller than the gap between each pole piece and the armature
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3, crosstalk due to magnetic wave magnetic flux occurs. Furthermore, when a force in the sound
groove traveling direction is applied to the cantilever 2, the fulcrum becomes unclear because
the damper 4 is deformed, which causes a cross modulation distortion. Referring to FIG. 3, FIG. 4
and FIG. 6, a plastic holder 15 is attached to the other end of the cantilever 2 having the distal
end stylus tip 1, as shown in FIGS. A pair of armatures 3.3 'are arranged in the direction of
making 900 relative to each other in the holder 15, and are anchored to the support knob 16
with the' f suspension wire 17 via the braking damper 4 behind the holder 16. The pole pieces 6,
8 are disposed at positions sandwiching the armature 3 '.
Likewise, pole pieces 6 and 7 are arranged in the armature 3. When playing 45 = -45 stereo
records in these four types of pickup cartridges, it is assumed that the armature 3 operates in the
axial direction of the cantilever 2 between the pole pieces 6 and 7 corresponding to the velocity
amplitude of the styler step 1 A magnetic flux change occurs between the pole pieces 6, 7 and an
electrical output signal can be taken out from the output terminal 14 of the coil 12 through the
yoke 10. At this time, the motion of the armature 3 'is such that the pole piece 5, 8 is rotated
between the pole pieces 5 and 8 sandwiching the armature 3' about the magnetic axis Y-Y 'of the
armature 3'. There is no flux change between 8 and no electrical output signal is generated.
However, in this method, the magnetic axis YY 'of the armature 3' passes through the fulcrum,
and further, if not perpendicular to the cantilever = + V, the maximum distance to the magnetic
axis Y-Y / of the armature 3 'from the fulcrum The rotational motion is parallel to the radius of
the cantilever operation plane, causing a change in magnetic flux between the pole pieces 5 and
8 of the armature 3 'and causing crosstalk. Also, the respective armatures 3, 3 'are orthogonal to
each other, and the rotational movement of the armature 73' itself is broken unless the
respective armatures 3, 3 'are at 46 ░ with respect to the vertical plane P including the
cantilever axis. There is a disadvantage that a magnetic flux change occurs between the pole
pieces 6 and 8 and crosstalk occurs. As described above, in the case of the pickup cartridge of
the conventional type, each in the direction perpendicular to the cantilever axis and in the
vertical plane including the cantilever axis 460 (the respective armatures are 900 mutually) and
further in the direction passing through the operation fulcrum It is very difficult in terms of
assembly to orient the magnetic axis of the armature, and there is a problem that the magnetic
flux changes immediately between the pole pieces as soon as the angular relationship is reached,
and the cross) Ji all occurs. The present invention provides an electromagnetic pickup cartridge
which can eliminate the above-mentioned drawbacks of the conventional electromagnetic pickup
cartridge. The triangulated pickup cartridge according to the present invention results in two
independent magnetic circuits having the shortest lengths of independent working gaps
corresponding to the modulation walls of each of the records in each virtual plane parallel to
each of the record modulation walls. It is characterized in that the pair of armatures are properly
oriented within the independent working gap. Hereinafter, the present invention will be
described in detail with specific examples. 6 and 7 show a simple example of the present
invention 9, the working gaps formed by the pole pieces 26.27 and 26.28 are independent of
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each other, and the shortest length of each 1'F dynamic gear Is a plane P2. Parallel to the two
modulation walls of the record board.
Located in P3, the two armatures 23, 23 'are fixed to the holder 36 parallel to the cantilever
EndPage: 2 lever 22 so that the magnetizing direction is longitudinal in the respective working
gaps. Although it mentions later 1. The armature and the holder are supported by a suspension
wire 37 together with the cantilever 2. According to the principle of power generation, when the
respective armatures 23, 23 'vibrate through the cantilever 22 in response to the velocity
amplitude of the styler step 21 at the tip of the cantilever 22, the operation formed by the
respective pole pieces 26. 27 and 26. 28 A magnetic flux change occurs in the gap to generate
induced lightning pressure in the ailes 31 and 32 through the yokes 29 and 3o, and an electrical
output signal is taken out from the output terminals 33 and 34 of the coil. In the 45-4 'Leo
record, each modulation wall is at an angle of 46 degrees to the recording surface and 90
degrees to the other modulation wall, and the tone is applied to each modulation ?. Assuming
that one modulation wall stylus tip 21 is vibrated in a direction perpendicular to the modulation
wall according to the recording, one armature 23 performs a scratching operation, that is, pole
pieces 26 and 27 in a plane P2 parallel to the modulation wall. And causes a change in magnetic
flux in the working gap between the pole pieces 26. 27 to generate an induced voltage in the coil
32 through the yoke 3o, and an electrical output signal is taken out at its output terminal 34. At
this time, the movement of the armature 23 'moves parallel to the pole pieces 25 and 28 so that
no change in magnetic flux occurs in the working gap between the pole pieces 26 and 28. That
is, no induction voltage is generated in the coil 31 passing through the yoke 29 and no electrical
signal is generated at the output terminal 33 thereof. In an actual musical tone record, the
armatures 23.23 'perform very complicated operations according to the operation of the stylus
tip 21, but each armature 23, 23' is sensitive only to the signal component of each modulation
wall. There is no cross-talk, and a signal pickup with a high degree is realized with a high pickup
cartridge. FIG. 8 shows another embodiment of the present invention, which differs from the first
embodiment in that the pole piece 26.27 is parallel to the plane P2 parallel to one of the
modulations. Each working gap is formed so that the pieces 25 and 28 are parallel to the plane
P3 parallel to the other modulation wall. Therefore, it is the pole piece 25.28 that contributes to
power generation when the armature 23 operates parallel to the plane P2 parallel to one of the
modulation walls, which is operationally different from the first practical example. It is the pole
pieces 26, 27 that contribute to power generation when the parallel compensation is performed
on the plane P3 parallel to the other modulation wall 23 '.
That is, since the armature 23 'operates at right angles to the pole piece 26 ░ 28 to produce a
flux change in the working gap formed by the pole pieces 25 and 28, an electrical output signal
is generated from its output terminal 33. At this time, the armature 23 operates in parallel with
the pole pieces 26 and 27 so that no change in magnetic flux occurs in the working gap formed
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by the pole pieces 26 and 27 and no electrical output signal is generated from the output
terminal 34 thereof. Thus, the cartridge in this example is sensitive to the signal components of
the respective modulation walls even if the mounting angles of the armatures become slightly
unbalanced. z It is possible to realize a pick-up J cartridge with a high degree of signal loss = no
loss talk. Even though the 1 ░ armature is facing in any direction, one armature only moves
parallel to the pole piece, since the other armature has a 1? angle action on the piece. The olds
of Kloe Talk are nauseous-furthermore, they do not share the working gap of the broken
armature with the working gap of the other armature, making their magnetic circuits
independent of each other. It is possible to completely prevent the generation of a cross-cut due
to magnetic flux between them. As will be described later, since the supporting point is supported
by the suspension wire 37, the supporting point becomes clear without deformation of the elastic
material even if a force in the world running direction is applied to the cantilever, thereby
preventing the occurrence of intermodulation distortion. it can. The crane 9 shows an
embodiment of the present invention. The needle assembly structure has a cantilever 22-, a
stylus step 21 at the end, and the other end made of plastic with an armature magnet 23
attached at the other end. The holder 35 of At the rear end of the holder, a damper rubber 24 is
disposed so as to enclose the suspension wire 37, and a suspension support pipe 38 fixed to the
screw is fixed to the suspension wire 37EndPage: 3. A suspension wire 37 to which a support
pipe 38 is attached is stretched by a support knob 3.6 integrated with a needle knob 41 and
fixed by screws 39. The body assembly has a side pole connected from the yoke 29 and its end
is: It has pole pieces 2? and 27 parallel to one of the record modulation grooves. In order to
achieve this parallelism, the side pole piece having the pole piece 26 ░ 27 is insert-molded to
form a yoke assembly 4o. Coils 32. 32 'are differentially connected in series to the side poles, and
the entire power generation block is encased in a shield case 42 to prevent the influence of
external hum.
The shield case 42 is provided with a hole into which the armature magnet 23 is inserted and the
case 43 and the terminal assembly 46 are attached to form an external appearance, and the
terminal 34.degree. -Is soldered. Needle structure and body assembly structure. It is held by the
fitting of the eaves knob 41 and the shield case 42, and the armature magnet 23 is formed by the
pole pieces 26 and 27 so as to be positioned in the proper direction of the gap. Although only the
two-piece channel has been described, the structure of the opposite channel is similar. Because it
has a large support point support as described above. Even if the vibration fulcrum is clear and a
force in the direction of movement of the sound groove is applied to the cantilever 22, there is no
i-shape of the damper rubber 24, and generation of modulation distortion occurs in speech. The
suspension wire 37 is made of, for example, a material with little stretchability such as a piano
wire 9, and the suspension wire 37 together with the damper 24 is given a suitable tension and
fixed by a screw 39 to the support knob 36. It is possible to apply appropriate damping to the
vibration system so as to obtain a special species. In order to form the pole pieces of both
channels parallel to the record modulation wall, it can be easily formed by resin molding, for
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example, side beams having pole pieces to an example. Although FIG. 4 shows only one channel,
it is possible to share the yoke 29 with the yoke of the other channel 1. There is no problem in
practical use. As described above, according to the present invention, it is possible to provide a
pickup cartridge having various characteristics with good signal separation without crosstalk.
4. Brief description of the drawings. FIG. 1 is a front view showing a conventional
electromagnetic pickup cartridge, FIG. 2 is a side view thereof, and FIG. 3 is a perspective view of
a basic tank i showing a conventional electromagnetic pickup cartridge. 4 is a front view of four
or more drawings, FIG. 5 is a side view thereof, FIG. 6 is a first basic structural perspective view
showing the present invention, FIG. 7 is a front view thereof, and FIG. FIG. 9 is a front view of the
basic structure 2 and FIG. 9 is a cross-sectional view showing a specific embodiment of the
present invention. 21 иииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Damper, 2
rs, 2 e, 27. 28 ииииииии и Fist pole piece 29,30 и и и и и и и и и Yoke, 31, 32 и и и и и и и и и и и и и и и и и и и и и и и и и и и и и
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии
и и и и и и и и и и и и и и и terminals и и и и и и и и и и и и и и Hol f 7, 41 --... needle knob. Fig.2 Fig.3 EndPage: 4
Fig.8 Fig.9 Fig.3 EndPage: ?
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