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JPS5437702

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DESCRIPTION JPS5437702
Description 1, title of the invention
Record playback car? IJ Dodge's flux focusing pipe
DETAILED DESCRIPTION OF THE INVENTION The present invention extends to a flux-focusing
pin "which forms part of the magnetic circuit of a cartridge used for record reproduction.
Conventionally, as a high permeability alloy material in the case of forming a flux focusing pipe
which constitutes a part of the 4a circuit by being provided at the rear end of the cantilever of a
cartridge used when reproducing a record, it is mainly used. Permalloy alloys are used. However,
although permalloy alloys are excellent in workability, the magnetic properties are significantly
deteriorated due to stress and the like at the time of processing. Also, since the electrical
resistance is low and the excess IjL flow loss is large, the characteristics of the high frequency
range of the cartridge are deteriorated. The present invention has been made in view of the
above-mentioned points, and the object of the present invention is to improve the frequency Iii
and holding property from mid-old to high-pitched range, and to be excellent in processability
and cost. There is a low-contrast record playback cartridge that provides a flux focusing pipe. In
the following, according to one embodiment of the present invention, the end page will be
described according to the attached surface: 1 is a cantilever with a needle 2 mounted at its tip, 3
is hot-worked to form a part of a magnetic coil The flux focusing pipe 3 is fitted to the back end
m of the cantilever 20 with a flux focusing pipe formed by using a buried amorphous high
permeability alloy. Incidentally, to describe in detail the case of forming the magnetic flux
focusing vibrator 3, by heating the ribbon-like high magnetic permeability alloy at a temperature
above the curing temperature and within a range of temperature of i1 for a suitable time
according to the material. It is formed by hot working, quenching, and welding directly to the
cantilever 2 or by winding it around a jig of a predetermined shape (rod shape). 4 is a magnet
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attached to the cantilever 2. In the embodiment of the present invention, since the flux focusing
vibrator 3 is formed of the amorphous high permeability alloy which has been subjected to the
hot working as described above, the flux pipe east pipe 3 is made of a permalloy alloy or
Magnetic properties comparable to or higher than conventional high permeability materials such
as ferrite alloys are obtained, moreover, the electrical resistance is as high as about 150 to 200
μΩm, and the overcurrent loss is reduced, and the mid to high range is masked. Frequency
characteristics are good. Further, since no magnetic flux anisotropy pipe exists in the flux
focusing pipe 3 formed of an amorphous high permeability alloy, the magnetic properties are
stress-insensitive and the stability is good. Therefore, machining such as punching is also
possible, there is no need for stress relief annealing after processing, and the workability
becomes good. In the present invention, as described above, since the flux focusing pipe which
constitutes a part of the magnetic circuit of the car I) J is formed by using an amorphous high
magnetic permeability alloy which is subjected to the hot processing. The frequency
characteristics from the tone range to the high tone range can be improved, and further,
machining such as punching can be performed, so that the processability is improved and the
product cost can be reduced.
4 is a side view showing an embodiment of the present invention. 1 ........ cantilever 2 ......... needle
3 ......... flux concentrator pipe 4 ......... magnet patent applicant pioneer stock Company EndPage:
2
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