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BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
loudspeaker, and more particularly to an improvement of a loudspeaker that is configured to
convert an electrical signal into an acoustic signal through a magnetic field. [Prior Art]
Conventionally, a dynamic type speaker exists as a speaker configured as described above, and in
this dynamic type speaker, a solenoid coil is attached to a cone, and in the vicinity of this coil By
arranging the permanent magnet, the cone is integrally vibrated by the vibration of the coil
caused by the signal current (not described in the reference). [Problems to be Solved by the
Invention] However, in the dynamic type, as mentioned above, since the permanent magnet is
provided as described above, the weight tends to be large, and there are many room for
improvement because it leads to an increase in size. . An object of the present invention is to
configure a speaker with a simple structure, a small size and a light weight by rational
modification. [Means for Solving the Problems] The feature of the present invention is to change
the magnetic flux density of the magnetic field in response to the input signal, and by the change
of the magnetic flux density, the relative position between the magnetic field and the conductive
material. And a vibration unit for taking out the relative position change. The operation and
effect of the signal conversion unit are as follows. [Operation] If the above feature is configured
as shown in FIG. 1, for example, when an electric signal is supplied to the solenoid (4), the
superconducting material (3) corresponding to the change of the magnetic flux density generated
by the solenoid (4). The relative position between the magnetic field and the superconducting
material (3) is changed in the signal conversion unit (B) due to the repulsive force of '', and this
change in position is extracted as an audio signal by the vibration unit (A). It will be. That is, even
if the superconducting material (3) is a small material, it has the property of repelling by the
Meissner effect regardless of the polarity of the magnetic flux, so that it becomes possible to
vibrate without using a permanent magnet. [Advantage of the Invention] Therefore, the
conversion of the magnetic flux density into sound is realized by the conversion of using the
superconducting substance, but there is no need to use the permanent magnet, so the speaker
can be made compact and light with a relatively simple structure. It was constructed. In
particular, according to the present invention, as shown in FIG. 2 (a), the polarity of the magnetic
flux is reversed by energizing an alternating current signal to the solenoid etc., and as a result,
the conductive material repels each polarity. As shown in FIG. 2 (IF), an effect of being able to
take out an audio signal having a frequency twice that of the AC signal is also achieved.
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross section of the speaker, which comprises a vibrating portion (A) comprising a
circular cone (2) whose outer peripheral portion is attached to a ring-shaped frame (1), and A
signal conversion unit (B) comprising a thin plate-like superconducting material (3) attached to
the center of the cone (2) and a solenoid (4) disposed close to the superconducting material (3);
4) is wound around a bobbin (5) so as to generate a magnetic field by energization, and is
attached to a support member (6) connected to the frame (1). That is, the speaker converts the
change in magnetic flux density generated when an electric signal is supplied to the solenoid (4)
into relative vibration between the solenoid (4) and the conductive material (3), and the vibration
portion (A) ) As an audio signal. The electric signal to the solenoid (4) is transmitted through the
terminal (7) and the lead (8) attached to the support member (6). [Another Embodiment] In the
present invention, as shown in FIG. 3, for example, a solenoid (4) is attached to the side of a cone
(2) as a vibrating portion (A), and a conductive material is fixed to a fixed system. While attaching
(3), the other parts can be configured substantially the same as in the above-described
embodiment to obtain similar functions. In the present invention, a thin-plate shaped diaphragm
may be used in place of the cone in the vibrating portion (A), and the present invention can be
applied to all the machines forming a thin film superconducting material on this diaphragm or
the like. A thin speaker can be produced by using the thin film superconducting substance.
Further, the present invention may be used in a low temperature environment as well as using a
superconducting substance currently developed. Although the reference numerals in the claims
indicate the reference for the convenience of comparison with the drawings, the present
invention is not limited to the structure of the attached drawings.
Brief description of the drawings
FIG. 1 shows an embodiment of a loudspeaker according to the present invention, FIG. 1 is a
cross-sectional view showing the structure of the loudspeaker, FIG. 2 (a) is a graph of an AC
signal to be inputted, and FIG. 2 (El) is voice. It is a graph of the signal output, FIG. 3 is sectional
drawing showing the structure of the speaker of another Example.
(3) ...... superconducting material, (A) ...... vibrating unit, (B) ...... signal exchange section.