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JPH01109999

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DESCRIPTION JPH01109999
[0001]
FIELD OF THE INVENTION The present invention relates to a thin speaker widely used in the
field of AV equipment and the like. 2. Related Art Conventionally, a device for converting
electrical energy and acoustic energy is generally referred to as an electroacoustic transducer, in
which a speaker converts electrical vibration into mechanical vibration and further into acoustic
vibration. Speakers can be classified into electrodynamic type, electromagnetic type, electrostatic
type, piezoelectric type, etc. when they are classified according to conversion system, but more
than 99% of the speakers currently in practical use are electrodynamic type. This means that the
electrodynamic speaker can extend the low frequency reproduction limit because the amplitude
can be increased, and a considerable increase in efficiency can be realized even by design. The
operation of the electrodynamic speaker will be described with reference to FIG. When current
flows in the voice coil 7 of the speaker in FIG. 2, driving force is generated in the left and right
direction of FIG. 3 according to Fleming's left-hand rule. The diaphragm 8 is driven by this
driving force to generate a sound wave. However, since the electrodynamic speaker is driven by
the voice coil and the permanent magnet, the drive portion becomes complicated and large,
making it difficult to make a thin speaker. In addition, although the driving force is generated
from the magnetic flux density of the magnetic pole gap and the current flowing through the
length E of the voice coil in the gap, there is a limit to obtain sufficient conversion efficiency.
SUMMARY OF THE INVENTION In view of the above problems, the present invention provides a
highly efficient thin speaker with a simple storage structure in which a diaphragm integrated
with a superconducting magnet is driven by a flat coil. Means for Solving the Problems In order
to achieve this object, the thin speaker of the present invention is composed of a flat diaphragm
and a flat coil including a superconducting magnet made of a thin film. Operation With this
configuration, a magnetic field is formed by the superconducting magnet, and the diaphragm is
driven by supplying a current to the flat coil. Embodiment An embodiment of the present
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1
invention will be described with reference to the drawings. FIG. 1 shows the structure of a thin
speaker in an embodiment of the present invention. In FIG. 1, 1 is a flat coil, 2 is a diaphragm
supported at both ends so as to be movable, and 3 is a superconducting magnet. The operation of
the thin speaker configured as described above will be described below. A magnetic field is
formed by the superconducting magnet 3 which can be made thin and highly efficient, and the
diaphragm 2 is driven by supplying a current to the flat coil 1. Since the superconducting magnet
3 is made thin and has a freedom in shape, as shown in FIG. Is possible.
The core material of the moving plate 2 is a plate-like structure having iron as a main
component, and the chemical formula Ha2YCu303-. It is formed of a ceramic thin film of a
crystal structure based on. The ceramic of the barium-itrium-copper-oxygen structure exhibits a
superconducting state at an absolute temperature of 97 ', and a superconducting magnet 3 was
manufactured using this material. The magnetic flux density of the superconducting magnet 3 is
10000 gauss, which is higher than that of a normal electromagnet. The diaphragm 2 made of the
superconducting magnet 3 cooled with liquid nitrogen was driven by the flat coil 1, and it was
recognized that sufficient driving force could be obtained as a speaker. Another embodiment of
the present invention will be described with reference to FIG. 4 is a flat coil, 6 is a cone-shaped
diaphragm, 6 is a superconducting magnet formed at the center of the diaphragm 6. The
operation will be described below. In the present embodiment, the flat coil 4 is fixed, and the
magnet unit is driven together with the diaphragm 5. For this reason, by combining the
superconducting magnet 6 from the diaphragm shape, the material and the like, the degree of
freedom in designing the speaker can be largely obtained. In addition, the drive of the diaphragm
6 generated by the superconducting magnet 6 and the flat coil 4 is also a simple and highly
efficient thin speaker. Effects of the Invention By forming a thin, light, high magnetic force
superconducting magnet on a diaphragm, the present invention makes it possible to make a thin,
highly efficient speaker, and enables a speaker design according to the application. In addition,
an excellent speaker with high efficiency can be realized by the superconducting magnet and the
flat coil.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a block diagram of the thin speaker in the first embodiment of the present invention,
FIG. 2 is a block diagram of the thin speaker in the second embodiment of the present invention,
and FIG. 3 is a configuration of a conventional electrodynamic speaker FIG.
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1 ...... flat coil, 2 ...... diaphragm, 3 ...... superconducting magnet. Name of Agent Attorney Nakao
Toshio One other person Figure 1! "・ Flat coil 2-permanent stone
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3
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