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JPS5218002

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DESCRIPTION JPS5218002
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the structure of a conventional
moving magnet type pick-up cartridge, FIG. 2 is a view showing the structure of the moving
magnet type pick-up cartridge of the present invention, and FIG. FIG. IL and IR are power
generation coils, 2L and 2R are yokes, 3 is a cantilever, 4 is a cylindrical magnet, 6Lt 6R is a
protruding piece, and 7 is a substantially cruciform plate. 3 1
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of the Mobinog McNenot type (MM type) Pinoc Noop Car Torino. The basic structure of a
conventional MM pino-anoup force-torino is shown in FIG. In the figure, power generation coils
12L and 12R for left and right channels are wound respectively, and yokes 2L and 2R whose
both ends are opposed to each other are arranged in a rectangular shape so as to be orthogonal
to each other. A cylindrical magnet 4 having a cantilever 3 fixed to both ends of 2H is disposed
with a damper 5 interposed, and vibrates in proportion to the recording sound groove (recording
signal). In this structure, the shape of the magnet 4 (cylindrical shape) and the arrangement of
the magnets 4 are arranged in parallel, ie, both ends of the yaws 2L and 2R and the axis
(magnetization direction) of the magnets 4 are parallel to each other. It was possible to utilize the
magnetic energy of the magnet 4 effectively, power generation efficiency or rest. When the
magnet 4 with large magnetic energy is adopted to increase the magnetic flux linked to the
power generation coils IL and IH to increase the amount of power generation, the equivalent
mass of the pinocqua vibration system is increased and the characteristic or deterioration in the
high region is deteriorated. Do. Furthermore, since the amount of leakage flux is large, the
magnetic flux distribution is disturbed and becomes uneven due to the vibration l of the magnet
4 and distortion is large. 3) The present invention eliminates the above-mentioned drawbacks
and will be described in the following drawings. In the external view of the present invention
shown in FIG. 2, and in FIG. 3, the main parts are indicated, symbols 1 to 5 correspond to the
respective parts of the conventional example of FIG. The coils 2L and 2R are yokes for the left
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and right channels, 3 is a cantilever, 4 is a magnet, and 5 is a damper. In the figure, the present
invention is made of a high magnetic permeability material such as permalloy, and substantially
cruciform plates 7 provided with projecting pieces f, L, 6R opposed vertically to both ends of the
yokes 2L, 2R are provided at both ends of the magnet 4. It has a fixed structure, and as shown in
FIG. 2, it is disposed so as to vertically face the projecting pieces 6L, 6R of the substantially crossshaped plate 7 at both ends of the yokes 2L, 2H. According to the above structure, the magnetic
flux is concentrated on the protruding portions 6L and 6H of the substantially cross shape 7 to
increase the magnetic moment equivalently, and the number of magnetic fluxes linked to the
generating coils IL and IR to decrease the leakage flux The magnetic energy of Macnet 4 can be
effectively utilized to improve the motor ratio significantly. Further, by concentrating the
magnetic flux, the influence of the disturbance of the magnetic flux distribution due to the
vibration of the magnet 4 becomes extremely small, the magnetic flux distribution can be kept
uniform, and the distortion is reduced.
Furthermore, since the power generation efficiency is improved, the magnet 4 is made smaller
and lighter with smaller magnetic energy, the equivalent mass of the pickup vibration system is
reduced, the high frequency mechanical resonance frequency is raised, and the high frequency
characteristics are improved. I can do it. As described above, the present invention has a
structure in which the substantially cruciform plate 7 provided with the projecting pieces 6L and
6R, which are made of a high magnetic permeability material and vertically opposed to both ends
of the yokes 2L and 2H, is fixed to both ends of the magnet 4. Since it has, it concentrates on the
magnetic flux or the protruding pieces 6L and 6H, reduces the leakage flux to improve the power
generation efficiency, and makes the magnetic flux distribution uniform to reduce the distortion,
further reducing the equivalent mass of the pickup vibration system This has the advantage of
improving the high frequency characteristics. 4. Brief description of the surface 5 Fig. 1 shows
the structure of a conventional moving magnet type pickup cartridge, Fig. 52 shows the structure
of the moving magnet type pickup cartridge of the present invention, and Fig. 3 shows the same.
FIG. IL and JR are generating coils, 2L and 2R are yokes, 3 is a cantilever, 4 is a cylindrical
magnet, 6L and 5R are projecting pieces, and 7 is a substantially cruciform plate. No zt IR L IR J
L 埠 1 ′ ′ fi 5 z t R 2 L IR 2 R J L IR / L 埠 2 g 56 1 訳 z t 2 L −-a 4 二 2-IBC de 3 訳 U 42. 心 1 · k · · · · · · "64 ×" · · · · · · · 6R-3-Figure 3 1800 "! Sa
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