JPS538102

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DESCRIPTION JPS538102
Description 1, title of the invention
ピックアップカートリッジ
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in
pickup cartridges. Conventionally, as a pickup cartridge, one illustrated in FIGS. 1 to 3 is known.
In these figures, ■ indicates a cantilever, 2 indicates an amateur consisting of a pipe of a high
conductivity material fixed to the cantilever 1, 3 indicates a damper fitted to the armature 2, 4
indicates a coil with a magnetic yoke 5, 6 indicates a coil. It is a rod-like permanent magnet
installed facing the coil 4 with the amateur 2 held. 1 has two magnetic poles at both ends
substantially parallel to the axial direction of the cantilever 1 and armature 2 of the permanent
magnet 6, and FIG. 2 shows that it is substantially orthogonal to the axial direction of the
cantilever 1 and armature 2 of the permanent magnet 6. In the one having both magnetic poles
at both ends, FIG. 3 shows a permanent magnet 6 substantially similar to that of FIG. In these
pickup cartridges, magnetic flux flows between the yoke 5 and the permanent magnet 6 through
the armature 2 as shown by a chain line in FIG. 1, and when the armature 2 vibrates or
rotationally vibrates, the magnetic flux flowing to the yoke 5 Due to the change, a voltage
proportional to the vibration velocity or rotational angular velocity of the armature 2 is also
induced to the coil 4 at EndPage: 1. However, in these conventional devices, the flow of the
magnetic flux is not symmetrical with respect to the upper and lower sides and the left and right
sides of the cantilever 1, and since the armature 2 is a pipe, the sensitivity and crosstalk change
due to the sinking of the needle tip There is. According to the present invention, a thousand discshaped armature is provided at a vibration fulcrum position, the armature is supported by a
damper, and a ring-shaped permanent magnet loosely inserted with a cantilever is fixed facing
the armature. It is an object of the present invention to provide a pickup cartridge which can
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eliminate the above-mentioned conventional drawbacks. In this pickup cartridge, an armature 12
made of a flat disk of high conductivity material at the base end of the cantilever 11 is aligned
with the thickness direction to the axial direction of the cantilever 11 and positioned at the
oscillation fulcrum or center of gravity. The armature 12 is fixed and supported by a damper 13.
A ring-shaped permanent magnet 16 is provided opposite to the armature 12 and the cantilever
11 is loosely inserted in the magnet 16. A yoke 15 having a coil 14 is disposed in the vicinity of
the periphery of the armature 12. Incidentally, in the case of the yoke 15 stereo, four pieces are
arranged in the circumferential direction at an angle of 45 ° with respect to the normal square.
The end face of the damper 13 is supported by a fixing member 17. Reference numeral 18 in
FIG. 4 denotes a reproduction needle provided at the tip of the cantilever 11. In the pickup
cartridge configured as described above, the armature 12 made of a thousand disks and the ringshaped permanent magnet 16 loosely inserted with the cantilever 11 face each other. The flow
equivalent is uniform, and using an amateur 12 consisting of a thousand disks, the movement of
the position is small, and the position of the amateur 12 is exactly at the fulcrum, so that the
apparent equivalent mass including the cantilever 11 is Small changes are small, and stable
characteristics can be obtained. Furthermore, since the damper 13 can be supported by the fixing
member 17 at the end face, the braking force is different from that supported by the
conventional outer peripheral surface, and the braking force is easy. FIG. 5 shows an
embodiment of the present invention, in which a coil 14 is fixed in a shield case 19 via a support
member 20 and pressed against a cylindrical fixing member 17 fitted to the support member 20.
The suspension wire 23 supported at 4 ° by the member 21 is fixed by the set screw 22, and
the tip end of the wire 23 is inserted into the damper 13, whereby the damper 13 is held by the
suspension wire 23. The end face is supported by the fixing member 17, and the annular
permanent magnet 16 is fixed to the support member 20. It is to be noted that since the other
configuration of this embodiment is apparent from the above-described principle explanation
described with reference to FIG. 4, the same parts as those in FIG. 4 in FIG. I omit it. And in this
embodiment, by holding the damper 13 by the suspension wire 23, the fulcrum of vibration can
be made clearer, the influence of the needle pressure is reduced, and the linearity can be
improved. As described above, according to the present invention, it is possible to obtain the
characteristic that the change of the sensitivity and the crosstalk is a little stable and obtain the
effect that the braking force is easily applied.
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 to 3 are schematic side sectional views showing
different examples of the conventional pickup cartridge, FIG. 4 is a schematic side sectional view
for explaining the principle of the present invention, and FIG. The figure is a side sectional view
showing an embodiment of the present invention. 11-· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
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· · · · · · · · · · 18 · · · · · · · · · · · · · · · · · · · · · · · · · · · suspension Patent Assignee Name EndPage: 2
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