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JPS57173499

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DESCRIPTION JPS57173499
BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1, 2 and 3 are partially cutaway side views of an
embodiment of the present invention, and FIGS. 4 and 5 are microphones using magnetic
resistors and Hall elements Shows the electrical circuit of DESCRIPTION OF SYMBOLS 1 .....Magnet, 2 ...-Magnetoelectric conversion element, 3 ..... Vibrator, 4 ..-..-DC power supply, 5 ... fOutput terminal. Figure 3
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a microphone
using a magnetoelectric conversion element. Conventionally, as microphones such as guitars and
microphones, those using coils are known, but since the coils have to be wound, the number of
steps is increased, and in the case of guitars and microphones, the volume by the thickness of the
guitar string is large. The strength is adjusted by adjusting the height of the ferromagnetic core,
so 1 handling is difficult, and the life is short, and the reliability is low. The -The purpose of the
present invention is to eliminate the drawbacks of such a conventional microphone, and a
magnet (a magnetoelectric conversion element (2) and a vibrator (3) of a ferromagnetic material
are disposed in a magnetic circuit of 11, A DC power supply (4) is connected to the
magnetoelectric conversion element (2), and an output voltage corresponding to the vibration of
the vibrating body (3) is taken out from an output terminal (5) thereof. Embodiments of the
invention will now be described with reference to the drawings. 1 to 5 each show a microphone
provided on a guitar. FIG. 1 shows that a microphone provided with a magnetoelectric conversion
element such as a magnetic resistor (2) in contact with one of the magnetic poles of a magnet (1)
is fitted and fixed in a hole (7) provided in a guitar body (6) In the example fixed to the substrate
(8) together with the plastic case (9), it is opposed to the vibrating body (3) of the ferromagnetic
material, that is, the chord through a gap. In FIG. 2, the magnets (1-1) and (1-2) are in contact
with both ends of the core ae of ferromagnetic material, and the other end of the magnets (1-1)
and (1-2) is a magnetoelectric conversion element such as magnetism. Figure 1 shows a guitar
micro 1 -phone of the 1637 ° 111 I hum backing type with a resistor (2) placed in each contact.
05-05-2019
1
In FIG. 1 and FIG. 2, one terminal a9 of the magnetoelectric conversion element (2) is connected
to a DC power supply (not shown), and the other terminal (5) is an output terminal. In the third
WJ, the magnetoelectric conversion element (2) is disposed in the middle of the cores (10-1) and
(10-2) of the ferromagnetic material, and the magnet (1) is provided on the upper side of the
core (1-2) It is an example. When the magnetoelectric conversion element (2) is a magnetic
resistor, as shown in FIG. 4, a DC power supply (4) is connected to the magnetic resistor (2) and a
resistor a3 is connected to the output terminal (51). The output voltage is taken out from the end
of the resistor a3 via the capacitor α3. When the magnetoelectric conversion element (2) is a
Hall element, a DC power supply (4) is connected to the input terminal provided in the Hall
element body as shown in FIG. 5, and the capacitor 0 connected to the output terminal (5) is The
output voltage is taken out through O. When the string which is the vibrating body (3) of the
ferromagnetic material is vibrated, the generated magnetic flux of the magnet (1) fluctuates, so
that the magnet (3) 16: ia '5-9 [electricity When the conversion element (2) is a magnetic
resistor, the electric resistance value fluctuates according to the fluctuation of the magnetic flux.
Therefore, the voltage generated at the end of the resistor connected to the output terminal (5)
changes, and an output voltage corresponding to the vibration appears through the capacitor aj.
When the magnetoelectric conversion element (2) is a Hall element, the current from the DC
power supply (4) flowing in the Hall element body and the magnet (the magnetic flux of the
magnet 11 act through its output terminal (5) through the capacitor 0 An output voltage
corresponding to the vibration of the string (3) is obtained. Since the response to the vibration of
the string (3) of the magnetoelectric conversion element (2) is flat from direct current to lkM-, an
electrical signal faithful to the vibration of the string (3) can be obtained. The strength of the
volume due to the thickness of the guitar string can be adjusted by adjusting the voltage of the
DC power supply (4) of the magnetoelectric conversion element (2). As described above,
according to the present invention, the magnetoelectric conversion element (2) and the vibrator
(3) of the ferromagnetic material are disposed in the magnetic circuit of the magnet, and a DC
power supply (4) is provided to the magnetoelectric conversion element (2). Since it is connected
to i-i so as to take out the output voltage corresponding to the vibration of the vibration (4) 1639
° · 6i body (3) from the output terminal (5), the frequency characteristic of the vibration is
excellent and the long life ( ? And have the effect of reducing the number of man-hours.
05-05-2019
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