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JPS62198300

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DESCRIPTION JPS62198300
[0001]
This invention relates to a low frequency electroacoustic transducer. [Prior Art] An
electroacoustic transducer for low frequency is conventionally designed by designing an
electrodynamic speaker having a structure as shown in FIG. 2 for low frequency. [Problems that
the Invention Solves and Problems] Even if such a conventional electrodynamic speaker is
designed for low frequency, when a low frequency signal with a large amplitude is input, a large
image pickup is generated in the magnetic gap of the porcelain circuit. Since displacement is also
difficult to limit, non-linear amplitude distortion is likely to occur and thus is not well suited to
low frequency electroacoustic conversion. The present invention has been made in view of the
above-described point of view, and has been made to provide an electroacoustic transducer
capable of converting a low frequency signal of large amplitude with less distortion. Structure of
the Invention: As shown in FIG. 1, the electro-acoustic transducer of the present invention
comprises a cylindrical bobbin 2, a coil 1 wound around the cylindrical bobbin 2, a ring magnet
5, and an axis of the ring magnet 5. A shaft 6 fixed to the heart, respective guide pieces 3 and 4
slidably guided on both sides of the shaft 6 and fixed to both sides of the cylindrical bobbin 2, a
frame 8 fixed to the cylindrical bobbin 2; A peripheral portion is fixed to the frame 8 and a
diaphragm 7 fixed to the front end of the shirts 1 to 5 is provided. The beginning of winding 1a
and the end of winding 1b of the coil 1 become an input terminal pair. When an electrical signal
is input between the input terminal pair 1a-1b, magnetism of a loop entering from inside to
outside of the coil 1 and inside is generated. This magnetism is a large scale proportionate to the
magnitude of the signal current in the direction determined by the winding direction of the coil 1
and the flow direction of the electric signal, and in the inside of the coil 1, the magnetic flux is
parallel to the axial direction. The alternating magnetic field inside the coil 1 acts as a repulsive
force in the direction of the shaft 6 when the component in the direction of the shaft 6 is reverse
to the DC magnetism of the ring magnet 5 and in the direction of the shaft 6 in the same
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1
direction. Acting as an attractive force, the ring magnet 5 transmits a force proportional to the
magnitude of the alternating magnetic field. The alternating magnetic field inside the coil 1 is
required to be uniform in the width range of the ring magnet 5. The coil 1 used in the present
invention is solenoidal, and if the width of the coil 1 is necessarily elongated, the uniform range
can be easily broadened, the input signal is made large current, and the uniform range of
alternating magnetic field is obtained. Magnetic force is transmitted. Therefore, it is suitable for
low frequency electro-acoustic conversion in which vibration displacement is large. Further, as
the area of the imaging plate 7 increases, the area is increased because it is suitable for
conversion of low frequency signals, and the diaphragm 7 is provided with the central portions
on both sides of the cylindrical bobbin 2 even if it becomes heavy by that. The positioning is
stabilized because the guide pieces 3 and 4 are fixed to the tip of the shaft 6 which is fixedly
attached to the tip of the shaft 6 inserted through the holes 3a and 4b.
Effect of the Invention: The electro-acoustic transducer of the present invention is small in
magnetic distortion at the time of conversion from electric to mechanical even if a low frequency
signal of large amplitude is input, and the diaphragm 7 is positioned at its center Because it is
stable, distortion during machine-to-sound conversion is reduced, and as a result, distortion of
electroacoustic conversion can be reduced.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is an end view for explaining the present invention in detail, and FIG. 2 is an end view of a
conventional cone type speaker.
1 ... coil, 2 ... tubular bobbin, 3,4 ... their respective guide pieces, 5 ... ring magnet, 6 ... shaft, 7 ...
diaphragm, 8 ... ·flame. Patent applicant Onkyo Co., Ltd. Fig. 1 Fig. 2
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