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JPS52110605

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DESCRIPTION JPS52110605
Description 1, title of the invention
Electromagnetic type cartridge
3. Detailed Description of the Invention The present invention relates to an improvement of a
pickup cartridge used for reproducing a record, particularly an electromagnetic car on-the-ridge
? Generally, the electromagnetic cartridge is a movable magnet type, a movable coil type, and a
movable iron type Although the zero movable magnet type that is divided into three parts has
been widely used in the past, when trying to reduce the equivalent mass of the vibration system,
the output voltage decreases and the electrical impedance is large, so knowledge characteristics
are 0Movable coil type that had problems such as deterioration is the lead wire drawing method
of the coil, other manufacturing difficulties, difficulty in replacing the needle: non-uniformity or
slight decrease in output voltage Boosted EndPage: 1 lance etc. There was a problem in use and
cost, such as needing. Even in the movable iron piece type, when the conversion efficiency is
poor, the output voltage is lowered, or the saturation of the magnetic circuit causes the linearity
of the output signal to the vibration of the vibrator to be deteriorated. The present invention is an
improvement of the above-mentioned conventional electromagnetic type cartridge. The object of
the present invention is, first, to reduce the equivalent mass of the vibration system by using a
soft magnetic material for the vibrator. A-2 To reduce the electrical impedance to 2 and improve
the magnetic characteristics 0 to 3 To improve the linearity of the magnetic flux change due to
the tip displacement and to prevent the magnetostriction 0 to 4 the tip displacement To increase
the output voltage by increasing the amount of change in magnetic flux with respect to The fifth
goal is to obtain a sufficient induction S / N ratio.
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1
Electromagnetic type cartridge
The present invention will be described in detail in accordance with the drawings showing the
embodiments of 0 and 6 in which the components are simplified, the manufacturing process is
facilitated, and the processing 9 assembly fp degree is enhanced. FIG. 1 shows a structural view
of an electromagnetic cartridge according to the present invention. Is Figure 2 according to the
present invention? (i) shows the operating principle of the vibrator when the front needle is
displaced downward, (B) shows the operating state when no displacement is received, and (0)
shows the front needle Represents the operating state for the displacement of the vibrator when
it is displaced upward. FIG. 3 shows the relationship between the amount of change in magnetic
flux in each pole piece and the change in combined magnetic flux 6 'with respect to the
displacement of the needle tip of the electromagnetic cartridge according to the present
invention. First, the configuration of the electromagnetic cartridge according to the present
invention will be described in detail with reference to FIG. In FIG. 1, reference numeral 2 denotes
a cantilever whose front end 1 is fixed at its front end, and at its rear end is fitted a vibrator 3
made of a flat soft magnetic material or the like having a vibration fulcrum position 4
substantially at its middle 08 is a visco-elastic body made of rubber, synthetic resin or the like
which is pressure-bonded to the rear end face of the vibrator 3 and is subjected to compressive
deformation by the holder 9 to give appropriate damping resistance and equivalent stiffness to
the vibration system. ing. Reference numerals 5a and 5b denote permanent magnets made of
hard magnetic materials having the same shape and dimensions and magnetic properties, and
pole pieces 6b made of soft magnetic material or the like by opposite faces of different magnetic
potentials of the permanent magnets sa and sb. It is orthogonal to the axial direction of the other
end of the zero pole piece 6b having one end clamped and press-contacted, and is on & = Th
passing through the vibration fulcrum position 4 and is disposed adjacent to the k # 1 child 3.
One end of pole pieces 6a and 6o made of a soft magnetic material or the like is pressure-welded
to both end poles of permanent magnets 5a and 5b obtained by clamping and pressing pole
piece 6b, and the other end is symmetrical with respect to pole piece 6b in the figure. Are
arranged such that 6a is at one end of the front needle 1 side of the vibrator 3 and 60 is at the
rear end of the vibrator 3, and the pole pieces 6a, 6b and 6c are the centers of the cantilevers 2.
The coils o7a, 7b and 7a arranged at the upper position in the figure with respect to the axis are
coils respectively wound around the pole pieces 6a, 6b and 6a so that power is effectively
generated with respect to the displacement of the vibrator 3. The operation of the connected
electromagnetic cartridge according to the invention will now be described in detail with
reference to FIG. In FIG. 2B, when the vibrator 3 approaches the pole piece 6b, the magnetic
reluctance between the pole pieces 6a and 6b and the magnetic reluctance between the pole
pieces 6b and 60 become equal to each other, and the pole piece 6a is a permanent magnet. In
the figure, the DC flux ? ? ? directed downward in the figure from 5a, while the DC flux ?
directed upward in the figure from the permanent magnet 5b still flows in the pole piece 6C,
there is no flux change, Since the direct current magnetic flux ? from the permanent magnet 5a
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and the permanent magnet 5b cancel each other, no magnetic flux flows. Therefore, no electricity
is generated in the carp h7a, 7b, 7 ░.
When the vibrator 3 approaches the gap between the pole pieces 6a and 6b in FIG. 2 (A), the
magnetic reluctance in the gap between the pole pieces 6a and 6b decreases, and a magnetic flux
downward from the permanent magnet 5a to the pole piece 6a in the figure. An increase amount
+ ?? flows, and an upward flux enhancement ofEndPage: 2 + ?? flows also to the pole piece
6b through the oscillator 3. At this time, the gap magnetic resistance between the pole pieces 6b
and 6C increases, and from the permanent magnet 5b The flux reduction amount -.DELTA. In the
downward direction in the figure relatively flows in the pole piece 6o, and the flux reduction b in
the upward direction also flows in the pole piece 6b through the gap. Therefore, the magnetic
flux change amount ?? in the downward direction in the figure flows through the pole pieces
6a and 6c, and the magnetic flux change amount 2?? in the upward direction flows through
the pole piece 6b, so power is generated in the coils 7a, 7b, 7c. In FIG. 2 ((3), when the vibrator 3
approaches the gap between the pole pieces 6b and 60, the gap between the pole pieces 6b and
60 decreases in magnetic reluctance from the permanent magnet 5 to the pole piece 6b in the
figure. The flux increase amount + ?? flows and the upward flux increase quantum ?? also
flows to the pole piece 6C through the vibrator 3 ? On the other hand, the gap part magnetic
resistance of the pole pieces 6a and 6b increases, so As in the case of A), in the pole piece 6a, a
flux reduction amount -?? in the upward direction in the figure also flows like the pole piece
6b. Therefore, the magnetic flux change amount ?? upward in the figure flows through the
pole pieces 6a and 6C, and the magnetic flux change amount 2?? downward flows through the
pole piece 6b. Therefore, in the coils 7a, 7b and 7c It is generated in the opposite direction. That
is, according to the present invention, it is possible to suppress the electric impedance of the
vibrator structurally low, and air-based transmission characteristics can be improved. Oni ((The
synthetic flux change is 4 times the magnetic flux change of the pole piece 6a and 6c, and the
pole piece 6b) doubles the change amount of the 4 fi ? and increases the output voltage because
the magnetic flux change i6 with respect to the needle tip displacement If the externally induced
magnetic flux change works in the vertical direction of the diagram, the coils 7a, 7b for the
magnetic flux change can be made. Since the 70 output voltages are connected to cancel each
other, the magnetic circuit structure is disposed at the upper part of the vibration system so that
the induction S / N ratio can be improved without receiving the change in the external induction
flux, The gap between the recording disc surface and the cartridge main body including the
magnetic circuit can be made large at the time of reproduction, and the vertical tracking angle of
the vibration system which easily matches the record recording angle can be given to prevent
distortion.
O pole piece permanent magnet can be simplified, processing, accuracy 1 improvement of
assembly etc. can be expected 0
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4. Brief description of the drawings FIG. 1 is a structural view of an electromagnetic cartridge
according to the present invention, FIG. 2 is an operation principle diagram of the
electromagnetic cartridge according to the present invention, and FIG. 3 is a tip displacement of
the electromagnetic cartridge according to the present invention. Is an explanatory view showing
the relationship between the amount of change in magnetic flux in each pole piece and the
amount of change in combined magnetic flux with respect to the axis 01
ииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииииии Vibrator , 4 ..... Vibration fulcrum position t5a, 5b .....
Permanent magnet s 6a, 6b, 6o. 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 Patent holder Pioneer Corporation
EndPage:?
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