JPS5449902

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DESCRIPTION JPS5449902
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view of a conventional
cartridge, FIG. 2 is a cross-sectional view of an embodiment of the cartridge according to the
present invention, and FIG. 3 is a front view of the cartridge in FIG. Explanation of symbols of
main parts, 1 ··· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · Damper.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cartridge for
stereo, and in particular to a moving magnet type cartridge. In the conventional moving magnet
type cartridge, as shown in the cross-sectional view of FIG. In the figure, a stylus tip 2 is disposed
at the tip of the cantilever 1, and a rod-like magnet 3 a is fixed to the end of the cantilever 1 by a
sleeve 6. Further, the disk-shaped damper 5 held by the cylindrical holder 4 holds the vibration
of the cantilever 1 and holds the vibration sensor 11. However, in such a configuration, although
the structure is simple and inexpensive, the moment of inertia of the cantilever 1 is large because
the mechanical displacement of the magnet 3a is relatively large. For this reason, there are cases
where sufficient braking effect can not be obtained by braking with only the damper 5.
Moreover, since the magnet 3 used is a rod-shaped alnico magnet, there existed a fault to which
the output voltage obtained can become comparatively small. The object of the present invention
is to provide a stereo cartridge which overcomes the above-mentioned drawbacks. The present
invention will be described in detail with reference to the attached drawings. FIG. 2 is a crosssectional view of the embodiment of the cartridge according to the present invention, and the
same parts as in FIG. 1 are indicated by the same reference numerals. FIG. 3 is a front view of the
cartridge in FIG. In the figure, a stylus tip 2 is disposed at the tip of the cantilever 1, and a diskshaped magnetic member, for example, rare earth magne y) 3b is disposed on the circumference
of a predetermined distance from the tip of the cantilever 1 There is. The cantilever 1 and the
magnet 3b are bonded by an adhesive or the like. Further, for example, a damper 5 made of a
visco-elastic body of disc-like rubber or the like held by a cylindrical holder 4 abuts on one
surface of the magnet 3b \ to control the vibration of the cantilever 1 '. The cantilever 1 is held in
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place. As described above, by bringing the magnet 3b and the damper 5 into contact with each
other, it is possible to obtain the braking effect by the frictional force at the contact surfaces of
the two as well as the braking action of the damper 5. The magnet 3 b can also serve to position
the cantilever 1. As described above, according to the cartridge according to the present
invention, good quality reproduction sound can be obtained because of excellent damping of
vibration of the cantilever, and the assembly process is easy because the structure is simple and
the number of parts is small. . Furthermore, high output voltage can be obtained by using a disklike rare earth magnet.
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