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JPS5187406

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DESCRIPTION JPS5187406
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic cross-sectional view showing one
embodiment of the present invention, FIG. 2 is a schematic cross-sectional view showing another
embodiment of the present invention, and FIG. Explanatory drawing, FIG. 4 is a schematic
sectional drawing which shows the application Example of this invention. In the figure, 1 is a
cantilever, 2 is a sound needle, 3 is an armature, 4 is a device fixing portion, 5 is a rubber ring, 6
is a screw, 7 is concave, 8 is a ring-shaped permanent magnet, 9 is a ring, 10 shows a yoke. No.
1-13-Japanese Utility Model Application No. 51-87406 (2) -14
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the structure of a
moving magnet (MM type) cartridge for a harrecord player. In general, this type of MM type
cartridge has a dowel attached to one end of a cantilever and a permanent magnet attached to
the other end as an armature, and this permanent magnet is opposed to a yoke wound with a
wire ring, and is permanent according to the vibration of the dowel. The magnet is oscillated, and
a voltage is induced in the coil based on the change in the direction of the magnetic flux of the
yoke and the change in the magnitude of the magnetic flux density. Hitherto, various structures
have been proposed as such an MM type cartridge, and for example, in Japanese Patent
Publication No. 37-14622, a flat armature magnetized in the thickness direction is inserted and
arranged in a yoke, The flat armature is supported by an ear bearing on the opposite side to the
extension side of the cantilever of the flat armature, and a structure in which the armature is
pressed against the ear axis water by an elastic element such as a compression spring is shown.
Here, the two elastic elements are provided to make the armature tiltable, to restore the armature
to a fixed position, and to buffer the tilting vibration of the armature. However, only by using the
elastic element of the type shown in the above-mentioned publication, the elastic force O is likely
to vary depending on the material and the shape. In addition, the elastic force is also changed by
multiple use or aging. It will be appreciated that such a change in elasticity adversely affects the
properties of the cartridge, not to mention here. Further, in the above publication, voltage is
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induced in the ring only by the magnetic flux from the armature consisting of one permanent
magnet, so the change in the direction of the magnetic flux and the magnetic flux density on
which the induced voltage is based It is difficult to obtain a large output change because it is only
possible to obtain the quantity according to the pole approaching and moving away from the
yoke. Accordingly, an object of the present invention is to provide an MM type cartridge for a
record player, which has uniform and stable characteristics and can increase the change in
induced voltage in a wire ring. That is, according to this invention, a permanent magnet is used in
common with a rubber or a compression spring as an element for applying an elastic force to an
armature, thereby achieving the above object. The invention will now be described by way of
example with reference to the following discussion. Referring to FIG. 1, the essential portions of
one embodiment of the MM-type cartridge for a record player according to the present invention
are shown.
In the embodiment shown in FIG. 1, the dowel 2 is attached to one end of the cantilever 1 and the
flat disk armature 6 magnetized in the thickness direction is extended at a right angle to the
cantilever 1 while the other end. While fixing the rubber fR 5 to the device fixing portion 4 and
screwing and supporting the screw 6 having a sharpened tip in the screw hole of the device 4fixing portion 4 at a position passing through the inside of the rubber ring 5 While pressing the
rubber ring 5 on the tip of the screw 6 with a slight elastic compression to the tip of the screw 6
while pressing the dent 7 with a sharp bottom provided on the opposite side to the side where
the cantilever 1 of the flat armature 6 extends And the armature 3 has the same polarity as the
armature 3 (the S poles are opposed but the N poles may be opposed in the figure) so that the
movable range of the canner lever on the cantilever 1, the coefficient of restitution of the magnet
And so on with optimal dimensions The ring-shaped permanent magnet 8 fitted in which is fixed
to the device fixing part 4. When configured as described above, the flat armature 3 is
sufficiently pressed against the tip of the screw 6 by the mutual repulsive force with the ringshaped permanent magnet 8, and as a result, it is supported so as to be able to tilt and vibrate in
all directions like a pivot bearing. Further, due to the mutual repulsive force with the ring-shaped
permanent magnet 8, the force for restoring the flat armature 3 to a fixed position is destroyed,
and the rubber ring 5 cushions the tilting vibration of the flat armature 5. 5-L, when the flat
armature 3 performs tilting vibration following the movement of the dowel 2, part of the flat
armature approaches or separates from the yoke (not shown) disposed opposite to the flat
armature 3. Because The magnetic flux density of the yoke and / or the direction of the magnetic
flux changes, and a voltage is induced in a coil (not shown) wound around the yoke. FIG. 2 shows
an embodiment in which the rubber ring 5 is interposed between the flat armature 6 and the
ring-shaped permanent magnet 8, and the other constitution and effects are the same as the
embodiment shown in FIG. . In the embodiment shown in FIG. 1 and FIG. By rotating the screw 9
screwed into the screw hole of the device fixing portion 4, it is possible to adjust the restoring
force of the flat armature 6 and adjust the buffer force of the tilting vibration of the flat armature
rod. The same effect can be obtained by using another elastic member such as a compression
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spring (not shown) instead of the rubber ring 5. Further, in the embodiment described above, a
part of the flat armature 6 approaches or separates from the ring-shaped permanent magnet 8 in
accordance with the inclined imaging movement of the flat armature 6-ture 6. FIG. 3
schematically shows this state using a magnetic flux distribution indicated by a thin line.
When the flat armature 6 is sufficiently separated from the ring-shaped permanent magnet 8 as
shown in FIG. 5 fal, the magnetic flux distribution of each of the ring-shaped permanent magnet
8 and the flat armature can be determined by the middle plane of the respective pole faces. It
becomes almost symmetrical with respect to P1P2. However, when the flat armature 6 inclines
and approaches the ring-shaped permanent magnet 8 as shown in FIG. 5 (bl). The magnetic flux
distributions of the ring-shaped permanent magnet 8 and the flat armature 6 are distorted due to
the interaction, and the magnetic flux density becomes extremely high in the vicinity of the
portion where the same poles face each other. Therefore, if the yoke is disposed at or near the
point where the magnetic flux density changes significantly, the flat armachair closer to and
away from the yoke further changes in the magnetic flux density, and as a result, the wire wound
around the yoke 7-? Which greatly changes the ring induced voltage It becomes possible.
Further, FIG. 4 shows an applied embodiment of the present invention. The screw 6 is made of a
magnetic material, and the yoke 10 on which the wire ring 9 is wound is connected to the screw
rod. According to such a configuration, the screw 6 supports the flat armature 6 as a pivot
bearing and doubles as a part of the yoke, so that the entire configuration can be simplified. In
the case of this application example, a magnetic flux always flows in a certain direction in the
yoke 10, and the actual output is converted as a DC voltage according to the change of the
magnetic flux density. As in the case of a normal cartridge using a flat armature, a change in the
direction of the magnetic flux may be added to obtain an output as an alternating voltage. Of
course, in the case of a stereo record player, a plurality of yokes are provided. Although the
specific embodiments have been described above, the present invention is not limited to the
above-described embodiments, and it is understood that various design changes may be made
and combinations of the above-described embodiments may be included. There is nothing up to
8-.
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