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JPH04136572

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DESCRIPTION JPH04136572
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an
electromagnetic pickup, and more particularly to an improvement of a structure suitable for
enhancing output.
[0002]
2. Description of the Related Art Generally, as shown in FIG. 5, an electromagnetic pickup
comprises an iron core 50, a magnet 51 for magnetizing the iron core 50, and a coil wound
around the iron core 50. When the magnetic body is brought close to the magnet 51, an
electromotive force is generated in the coil 52 by electromagnetic induction. The electromotive
force of the coil 52 can maximize the output if the generated magnetic field of the coil 52 does
not leak.
[0003]
However, in the conventional electromagnetic pickup, the number of turns of the coil 52 is
increased to increase the output of the coil 52 because the magnetic flux density from the N pole
to the S pole is leaked. Or, the diameter of the magnet 51 must be increased. However, such a
method requires a large space, and the apparatus becomes large. An object of the present
invention is to provide an electromagnetic pickup capable of increasing the output of a coil
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without changing the size of the magnet and the number of turns of the coil.
[0004]
SUMMARY OF THE INVENTION In order to achieve the above object, the present invention
comprises an iron core, a magnet for magnetizing the iron core, and a coil wound around the iron
core. In the electromagnetic pickup provided, a magnet is connected to both ends in the axial
direction of the iron core, to construct an electromagnetic pickup.
[0005]
According to the above-described means, since the magnets are connected to both ends of the
iron core, it is possible to suppress the leakage of the magnetic flux density from the N pole to
the S pole, and change the magnet size and the number of coil turns. The output of the coil can
be increased without.
[0006]
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present
invention will be described below with reference to the drawings.
In FIG. 1, the axial core 10 is inserted into the insertion opening 12 of the coil bobbin 11, and the
coil 13 is wound around the coil bobbin 11.
[0007]
At both axial ends of the iron core 10, magnets 14 and 15 for magnetizing the iron core 10 are
connected.
For this reason, as shown in FIG. 2, when the magnet 15 is an N pole and the magnet 14 is an S
pole, the magnetic flux generated from the magnet 15 is guided to the magnet 14 without
leakage, and the leakage magnetic flux is suppressed. Can.
[0008]
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Therefore, the output of the coil 13 can be increased without increasing the number of turns of
the coil 16 or increasing the diameter of the magnets 14 and 15.
[0009]
Here, as shown in FIG. 3, when the electromagnetic pickup 16 according to the present invention
is disposed in the vicinity of the rotor gear 17 and the output voltage of the coil 13 is measured,
as shown in FIG. It was confirmed that the output voltage of the coil 13 was increased according
to the speed of 17.
[0010]
In this case, although the output voltage of the coil saturates when the speed of the rotor gear 17
increases to some extent in the conventional one, the output voltage of the electromagnetic
pickup 16 according to the present invention is more linear than the conventional one. You can
get the voltage.
[0011]
Further, in the above embodiment, the output of the coil 13 can be increased without changing
the number of turns of the coil 13 or increasing the diameter of the magnets 14 and 15, so the
same sensitivity as the conventional one can be obtained. It is possible to make it compact to
obtain a wide range of applications.
[0012]
As described above, according to the present invention, since the magnets are connected to both
ends of the iron core to reduce the leakage magnetic flux, the coil output can be increased
without changing the number of turns of the coil and the size of the magnet. It has the effect that
it can be made to contribute to the miniaturization of the device.
[0013]
Brief description of the drawings
[0014]
1 is a side cross-sectional view showing an embodiment of the present invention.
[0015]
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2 is a diagram for explaining the state of the magnetic field.
[0016]
3 is a configuration explanatory view for detecting the rotor gear.
[0017]
4 is a characteristic diagram showing the relationship between the speed of the rotor gear and
the output voltage.
[0018]
5 is a side sectional view of the conventional example.
[0019]
Explanation of sign
[0020]
10, 50 ... core core 11 ... coil bobbin 12 ... insertion port 13, 52 ... coil 14, 15, 51 ... magnet 16 ...
electromagnetic pickup 17 ... rotor gear
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