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JPS5187403

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DESCRIPTION JPS5187403
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic view of an example of a
conventional pickup, FIG. 2 is a schematic view of another example of a conventional pickup, and
FIGS. 3, 4 and 5 are diagrams of this example. In the drawings for explaining the power
generation principle of the pickup according to the invention, a is a plan view, b is a front view,
FIG. 6 is a perspective view of an essential part of one embodiment of the pickup according to the
invention, and FIG. 8 is a front view of another embodiment, FIG. 9 is a front view of still another
embodiment, FIG. 10 is an enlarged front view of another embodiment of the armature, and FIG.
11 is still another embodiment of the armature. It is an enlarged front view of an example. In the
figure, 1 is a sound needle, 2 is a cantilever 3.3 ', 3 "is an armature, 4, 7, 8, 8L, 8I, 8R, 8R' is a
yoke, 6, 6L, 6L, ', 6R. , 6Fe indicate a wire ring. Fig. 1-5-51-87403 (2) Fig. 2 Fig. 3 Fig. 4-Fig. 5-651-87403 (3) Fig. 8-Fig. 9-7-actual Opening 51-87403 (4) Fig. 10 Fig. 11 OOO 串 -8
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
moving-magnoto type pickup for a record player, and more particularly to the structure of a pink
amplifier using a flat armature magnetized in the thickness direction. Heretofore, as this type of
pickup, those shown in FIGS. 1 and 2 are known. In the pickup shown in FIG. 1, a flat armature 6
magnetized in the thickness direction is made to extend orthogonal to the axial direction of the
cantilever 2 at the other end of the cantilever 2 to which the dowel 1 is attached at one end. The
flat armature 6 is supported so as to be able to tilt and vibrate in the yoke 4 in the front-rear
direction (in the direction of the arrow) about the fulcrum 5 in the yoke 4 and in the case of tilt
vibration of the flat armature 6 The direction of the magnetic flux flowing through the yoke 4 is
switched, and a voltage is induced to the wire 6 wound around this yaw. However, in the
structure of FIG. 1, the position of the pole of the flat armature 3 with respect to the yoke 4
moves only slightly when the flat armature 6 vibrates. It is difficult to improve the sensitivity. On
the other hand, the pickup shown in Figure 2 is. The yoke 7 having a substantially E-shaped cross
section is disposed so that the center pole P1 of the yoke 7 faces the periphery of the flat
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armature 60 at rest with an interval, and the inclined vibration of the flat armature 3 (the state of
vibrating to one side is shown by a broken line) So that the direction of the magnetic flux flowing
to the wound portion of the wire ring 6 of the yoke 4 is switched depending on whether the
peripheral edge approaches the front side magnetic pole P2 or the rear side magnetic pole P5 of
the yoke 7 to induce voltage in the wire 6 It is In the structure of FIG. 2 as described above, the
peripheral edge of the flat armature 6 at the time of the oblique imaging movement and the front
or rear magnetic pole P2. The amount of change of the distance to P5 is substantially the same as
the amount of displacement of the peripheral edge of the flat armature 3, so that the sensitivity
5- ÷ can be relatively increased. However, if the distance between the central magnetic pole P1
of the yoke 7 and the front and rear magnetic poles P2P is increased, that is, if the yoke 7 has a
large E shape, not only the whole becomes large but also the yoke As the magnetic flux density of
7 decreases, the voltage induced in the filament 6 decreases. Even so, if the yoke 7 is made small,
the winding work of the wire ring 6 becomes extremely difficult and expensive. Therefore, in
view of the above, it is an object of the present invention to provide a moving magnet type
pickup for a record player with high power generation efficiency at a low cost with a simple
structure.
Hereinafter, this invention will be described using an embodiment with reference to FIG. 5 to 5
are views for explaining the power generation principle of the pickup according to the present
invention. First, referring to FIG. 5, at the periphery of the plate-like square armature 30
magnetized in the thickness direction, the legs 8-1.8-2 of the yoke 8 having a U-shaped cross
section are Let me face each other. When the armature 6 is caused to tilt and vibrate about the
axis 9, the pole portions of the armature 3 are alternately switched to and opposed to the legs 81.8-2 of the yoke 8, so that a wire ring is wound around the yoke 8. If this is done, a voltage is
induced in this wire ring. More specifically, as shown in FIG. 4, when the armature 6 is slightly
rotated about the shaft 9 in the direction of arrow B, the south pole of the armature 3 is opposed
to one leg 8-1 of the yoke 8, The other leg 8-2 is opposite to the N pole, and as a result, a flux 流
れ る 1 in the direction shown in FIG. 4 (bl) flows through the yoke 8. Further, as shown in FIG. 4,
when the armature 6 is slightly rotated about the shaft 9 in the direction of arrow C, the N pole
of the armature 3 is opposed to the one leg 8-1 of the yoke 8 and the other leg The S pole is
opposed to the portion 8-2, as a result of which the magnetic flux φ2 in the direction shown in
FIG. Therefore, when the armature 6 is tilted about the axis 9, the yokes 8 have magnetic fluxes
φ1. φ2 will be alternately made redundant. Therefore, if a wire ring is wound around the yoke
8. j。 The electric power is generated when the 5-armature 6 tilts. According to the power
generation principle described above, since the distance between the peripheral edge of the
armature 6 and the leg 8-1.8-2 of the yoke 8 is always constant, this distance can be designed
extremely narrow, and as a result, the power generation efficiency Improve. Further, since the
distance between the legs 8-1.8-2 of the yoke 8 can be made large, the winding operation for the
yoke 8 can be easily performed. Further, according to the above-described power generation
principle, the magnetic flux density of the yoke 8 changes extremely greatly with respect to the
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displacement amount of the armature 3. That is, considering the case of QK shown in FIG. 4 from
the state of FIG. 5, both legs 8-1.8-2 of the cage 8 are both poles of the yoke 6 in the state of FIG.
Although facing the middle, the magnetic flux density of the yoke 8 is almost zero. Follow the
rotation of armature 6 in the direction of arrow B. The portion close to S of armature 3 is
opposed to one leg 8-1 of the yoke weir, and the portion close to the N pole is opposite to the
other leg 8-2 so that the yoke 8 is devoid of magnetic flux First, when the armature 3 is further
rotated in the direction of the arrow 6-B, the legs 8-1.8-2 become closer to different poles from
each other, and the magnetic flux density rises sharply.
This is the same as when changing to the state of FIG. Therefore, it can be said that the sensitivity
is good. Further, since the flux cushion of the yoke 8 is in direct proportion to the displacement
of the armature 6, an output voltage without distortion can be obtained from the wire wound
around the yoke 8. Moreover, according to the above-described power generation principle, there
is obtained an advantage that the same effect can be obtained even if the thickness of the
armature is extremely thin. Therefore, the mechanical impedance characteristic of the vibration
system can be improved. 6 and 7 show stereo pink-up as one embodiment of the present
invention. In the pickup of this embodiment, a plate-like square armature 3 magnetized in the
thickness direction is extended perpendicularly to the axial direction of the cantilever 2 at the
other end of the cantilever 2 to which the dowel 1 is attached at one end. The flat armature 6 is
mounted on the plane including the dowel 1 in such a manner that one diagonal line coincides
with the other, and the flat armature 6 has a center of gravity in the thickness direction on the
central axis thereof. Such that the plane O-0 including the dowel 1 and the cantilever 2 can be
tilted and oscillated so that it is perpendicular to the extension plane of the sound board or
turntable (neither is shown) and at the center of gravity thereof. The armature 3 is biased to theposition by an optional damper (not shown) such as butyl rubber. Further, the yokes 8L and 8R
of a substantially U-shaped cross section are disposed on a plane which is parallel or parallel to
the extension plane of the armature 3 in this biased resting position, and one yoke 8L is A pair of
upper end faces of the four end faces inclined at 45 ° with legs 8L-1 and 8L-2 lit on a flat
surface 0-0 including the dowel 1 and the cantilever 2 at the periphery of the armature 6 The
other yoke 8R is opposed to the other end face 6R at intervals, and the other yoke 8R is opposed
to the other end face 6R, and the glands are respectively connected to these yokes 8L and 8R.
Wind the wheels 6L, 6R. 8-The relative positional relationship between such an armature 6 and
the yokes 8L and 8R will be apparent from FIG. The embodiment described above is a pick-up in
the so-called 45 ° -45 ° stereophonic disc system, and when scanning the musical disc with the
stationary needle 1, the stationary needle 1 from both lower sides having an angle of 45 ° to the
plane 0-0 Vibration is applied to Therefore, basically, the armature 6 tilts and vibrates about the
X-X axis or the Y-Y axis in FIG. 7 depending on which direction a vibration is applied to the
placement needle 1.
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First, considering the case where the armature 6 tilts and vibrates around the X-X axis, the
mutual positional relationship between the left yoke 8L and the armature 6 is similar to the
power generation principle described using FIGS. 3 to 5 As a result, a voltage is induced in the
filament 6L. However, the right yoke 8R. ((As to (6), since the same pole of the armature 6 is
opposed to the both legs 8R-1 and 8R-2, no magnetic flux flows in the yoke 8RK and no voltage
is induced in the wire ring 6R. Next, considering the case where the gear 9 to the armature 6 tilts
and vibrates about the Y-Y axis, the relative positional relationship between the right yoke 8R
and the armature 6 is as shown in FIGS. 3 to 5. It becomes like the power generation principle
described, and a voltage is induced in the filament 6R. But for the left yoke 8L. Since the same
pole of the armature 5 is opposed to the both legs 8L-1 and 8L-2, no magnetic flux flows in the
yoke 8IIC and no voltage is induced in the wire ring 6L. As described above, a signal is taken out
from any one of the nine-wire ring 6L, 6B depending on whether the armiacero vibrates about
the XY axis or about the YY axis. Thus, harmful crosstalk as stereo sound is prevented. In
practice, in many cases, the armature 6 is often simultaneously subjected to the force for taking
an inclined motion about the X-Y axis and the force for taking an oblique movement about the YY axis. Of course, signals are simultaneously taken out from 6L and 6R. In the above-described
embodiment, one double yoke 8L. 8R corresponds to the upper side of the armature 3, and when
these both yaws 8L and 8R are shown in FIG. 8 (the same positional relationship as described
above on the X-X ray and Y-Ya The lower part of the armature 6 may be arranged, and the same
effect can be obtained in that case. Further, as shown in FIG. 9, four yokes 8L, 8L ', 8R, 8R' are
disposed on the four end faces 3L, 3L ', 3R, 3Fj' of the armature 6 with the same positional
relationship as above, respectively. The wire ring 6L, 6L ', 6R, 6R', which is wound on, its wire
ring 6L. 6R 'are connected in series to each other, and the right-handed rings 6R and 6L' are
connected in series to each other, and their respective outputs may be added together (in this
case, in that case, An even larger output can be obtained. Further, although the armature 6 is
configured to be square in the above-described embodiment, it may be circular as shown in FIG.
However, in the case of using this circular armature 31 (in this case, it is preferable to make the
leg end of the yoke into an arc according to the shape of the armature 6 'from the viewpoint of
increasing the magnetic flux density of the yoke. -Alternatively, an armature 3 '"of -11-rightangled isosceles triangle may be used as shown in Fig. 11, in which case the end face facing the
yoke as compared to the mass ratio of the armature 6I' Since the length of 3'L and 3''R is long, it
produces good results in terms of power generation efficiency. Moreover, since the armature 6
′ ′ hardly extends below the attachment position with the cantilever, the dial scan The effect is
obtained that it is easily possible to bring the vertical tracking angle at time close to the ideal
value. In each of the above-described embodiments, a yoke having a substantially U-shaped cross
section is used. However, the yoke extends between the pair of leg portions whose ends are
opposed to the periphery of the armature and between the leg portions. It may have another
shape as long as it has a connecting portion connected in a linked manner. Of course, various
design changes and combinations of the various embodiments described above are also included
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in the present invention. 12−
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