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JPS572198

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DESCRIPTION JPS572198
Description 1, title of the invention
Moving coil type pickup cartridge
3. Detailed Description of the Invention The present invention relates to the holding means of the
stylus holder of the moving coil type pickup cartridge, and its feature is that the vibration
comprising the reproducing needle, the cantilever, the moving coil, etc. After assembling the
system to the stylus holder, the stylus holder is held by a holder having elasticity in the direction
perpendicular to the cantilever axis, which facilitates the assembly of the moving coil type pickup
cartridge. Conventionally, as shown in FIG. 1, a movable coil type pick-up cartridge capable of
needle exchange is known. That is, the disk-shaped coil holder 4 in which the cantilever 2 and
the movable coil 3 are fixed to the replacement needle knob 1 made of synthetic resin is freely
rockable by the known cylindrical tamper 5 and the suspension wire 6 It is supported, and the
tension of the suspension wire 6 is appropriately adjusted and fixed by the set screw 7. In such a
thing, since the assembly work of the vibration system has to be performed at a narrow place in
the replacement needle knob, the attention of the skill and the center point is reduced by
EndPage: 1. An object of the present invention is to improve the drawbacks of the abovedescribed conventional apparatus and to obtain a movable coil type pickup cartridge which is
easy to assemble. One embodiment of the present invention will be described with reference to
FIGS. The parts given the same reference numerals as in FIG. 1 are assumed to be the same
members. The vibration system consisting of the cantilever 2, the movable coil 3 and the coil
holder 4 etc. is supported by a cylindrical stylus holder 8 made of metal, and the stylus holder 8
is integrated with the replacement needle knob 1 made of synthetic resin. It is supported by a
pair of holding members 9 having a cross-sectional arc shape and elasticity. A groove 10 is
provided on the outer periphery of the stylus holder 8 and engaged with a protrusion 11 on the
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inner side of the holder 9 to position the stylus holder in the force lever axis direction. In
addition, a linear groove 12 is cut on the back surface of the stylus holder 8 (opposite to the set
screw 7) and engaged with a protrusion 13 'provided between the reed and a pair of holders, and
the rotational direction of the stylus holder Position the The replacement needle Nof itself is
provided with three legs 14 and 15.16 each having a holding projection at its tip, and provided
correspondingly when the replacement needle knob is attached to a pickup cartridge main body
(not shown). It elastically engages with the recessed part and joins both. Four output terminals
17 are provided on the rear side of the replacement needle knob, and pickup outputs are directly
output several times without passing through the pickup cartridge main body.
At the time of assembly, first, the vibration system is incorporated into the stylus holder, the
tension of the suspension wire 6 is appropriately adjusted, and the set screw 7 is tightened. Are
aligned and pressed, and the linear groove 12 and the projection 13 are engaged and positioning
in the rotational direction is performed. If an adhesive is used in combination, the adhesive can
be firmly fixed, and there is no risk of the occurrence of a chatter due to resonance or the like.
What is shown in FIG. 6 is another embodiment, which differs from the one described above in
that the holding body 9 is provided at two places along the stylus holder. However, the
positioning means (the groove 10 and the ridge 11) in the cantilever axial direction is not
provided on one side. As described above, according to the movable coil type pickup cartridge of
the present invention, after the vibration system is assembled in the stylus holder, the stylus
holder is held by the holder having elasticity in the direction perpendicular to the cantilever axis.
-Easy to assemble,-It became possible to finely adjust the vibration system. In addition, since a
metal stylus holder can be used, the suspension wire is loosened compared to the conventional
device in which the suspension wire is directly fixed to the synthetic needle replacement needle
knob, and a cine-resonant resonance is generated. There was no risk of doing so. In the above
embodiment, the positioning means for the cantilever axial direction is provided on the holder,
but this is not always necessary. For example, a step is provided on the replacement needle knob
to engage the stylus holder, etc. It is also possible to simplify the structure of the carrier.
4. Brief Description of the Drawings FIG. 1 is a cross-sectional view of a conventional
replacement needle knob of a moving coil type pick-up cartridge, and FIG. 3 is a cross-sectional
view taken along the line I-XL of FIG. 2, FIG. 4 is a plan view of the portion shown in FIG. 3 as
viewed from above (in the same figure), and FIG. FIG. 16 is a perspective view of the stylus
holder, and FIG. 6 is a cross-sectional view of the replacement needle knob of another
embodiment. EndPage: 28 ...... stylus holder 9 ...... holder 10 ...... stylus holder outer periphery,
provided with a groove 11 .... - & collision provided inside of the holding body projections
Attorney Attorney OkaMakoto provided between the linear groove 13 ...... holder provided in
Article 12 ...... stylus holder - Part 1 (a! Fig. 2 (3-4 fourth! 'A ¥ 5 Figure 6 End Page: 3
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