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JPS5470529

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Notice
This translation is machine-generated. It cannot be guaranteed that it is intelligible, accurate,
complete, reliable or fit for specific purposes. Critical decisions, such as commercially relevant or
financial decisions, should not be based on machine-translation output.
DESCRIPTION JPS5470529
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a view showing the prior art of the present
invention and the cross-sectional structure of a molded speaker for explaining an embodiment of
the present invention. FIG. 2 shows an example of the cross-sectional structure of the diaphragm
4 as an essential part of this invention. 3 shows another example of the cross-sectional structure
of the diaphragm 4 as an essential part of the present invention. FIG. 4 shows the cross sectional
structure of another embodiment of the present invention. In the figure, 1 is a yoke, 2 and 9 are
permanent magnets, 3.12 is a voice coil, 4 is a diaphragm, 5 is a ferromagnetic powder, 6 is a
synthetic resin, γ is a synthetic resin film, and 8 is a ferromagnetic film , 10 is a ferromagnetic
plate, and 11 is a ferromagnetic column.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a loudspeaker,
and more particularly to the improvement of the material of a diaphragm in a loudspeaker called
an electric & type loudspeaker. (Speakers used in 21 small radios, telephones, earphones, etc. are
required to be small or thin. Therefore, conventionally, electromagnetic speakers without cones
have often been used in this field. FIG. 1 shows the cross-sectional structure of a conventional
electric type 8 speaker as an interesting prior art of this invention. Referring to FIG. 1, the
construction of the electromagnetic speaker will be described. The permanent magnet 2 is
housed inside a container-like yoke 1 having one opening fa-. The permanent magnet 2 has the
same end of the end facing the opening of the yoke 1 and the bottom surface of the yoke 1 (each
end has its respective pole of magnet. A voice coil 3 excited by a signal is wound around the
permanent magnet 2. The diaphragm 4 is provided to face one pole of the permanent magnet 2
and to close the opening of the yoke 1. In the conventional electromagnetic speaker having such
a configuration, the diaphragm 4 has conventionally been constituted of a ferromagnetic metal
plate such as an iron plate D). However, the diaphragm 4 made of this metal plate D) is selected
to its thickness or about 021 (3), or the specific gravity of the metal plate is large and thickness?
The flux was as thin as the flux (as it was limited. Thus, the diaphragm 4 is heavy, efficient, and it
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is difficult to widen the frequency band. Also, since the mechanical Q of the metal plate is small,
it has sharp resonance characteristics, and the speed at which vibration or transmission is
transmitted through the diaphragm is large, so that the acoustic impedance with air matches, so
the damping characteristics are bad and generally high fidelity. -It was said that it was not good
for a speaker. In addition, it would be desirable for the electromagnetic speaker as described
above to be smaller and thinner than conventional ones. Therefore, the main object of the
present invention is to provide a 能 率 a-type speaker having high efficiency, wide frequency
band, and excellent damping characteristics. Another object of this invention iz, advantageously
miniaturization and thinning! Le 1iiai type speaker is to provide. This invention is a synthetic
resin plate having a inertia body instead of a ferromagnetic powder plate as a vibrating plate (for
example, a ferromagnetic resin powder mixed with a synthetic resin, (4) or a synthetic resin) as a
diaphragm. The film is coated with a ferromagnetic film, etc.) y) Other IEIJ and features of the
present invention will be more apparent from the detailed description given below by examining
the drawings.
Here, again with reference to FIG. 1, an example of the present invention will be described. Note
2: This is a duplicate of the above explanation. In such an electromagnetic speaker, from the fact
that the DC magnetic field diameter of the permanent magnet 2 and the high frequency magnetic
field of the voice coil 3 are superimposed, it is the diaphragm 4 that vibrates at high frequency to
emit sound as in the conventional case. It is. This device is directed to the material of the
diaphragm 4 that vibrates as described above. This is discussed below. Figure y62 shows an
example of broken l11 l l of the diaphragm 4 as an essential part of the 4 plans. The diaphragm 4
is formed of a mixture of ferromagnetic powder 5 such as ferrite mixed with synthetic 4 M fat 6
as shown here. FIG. 3 shows another example of the cross-sectional (5) plane structure of the
diaphragm 4 as an essential part of the present invention. The vibrating plate 4 can also be
obtained by coating the ferromagnetic film 8 on the surface of the synthetic resin film 70 as
shown here. Even if the surface of the film 7 is printed with the ferromagnetic powder and
printed and formed to form the ferromagnetic film 8, the surface direction of the film 7 is coated
with ferromagnetic metal by a method such as plating or vapor deposition. The magnetic film 8
may be formed. The diaphragm 4 configured as shown in FIGS. 2 and 3 is selected to have a
thickness of, for example, about 0.1 to 0.5. If it is thick, it is preferable in terms of frequency
characteristics, or if it is worn thickly, for example, there is a defect with the metal plate such as
Q becoming high or low or heavy (it is necessary to consider them. Must be determined. In
addition, it is required that the diaphragm be light or rigid or high, which means that the
thickness of the diaphragm itself, the mixing ratio of the ferromagnetic powder 5 in FIG. 182, the
ferromagnetic film in FIG. It is determined by the thickness of 8 or the ratio thereof. The abovedescribed diaphragm 4 can also be applied to an electromagnetic (6) type speaker as described
below. FIG. 4 shows the cross-sectional structure of another embodiment of the present
invention. The speaker shown here includes a permanent six stone 9 formed in a cylindrical
shape, one end face of the magnet 9 is closed by the diaphragm 4 and the other end face is
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closed by the ferromagnetic plate 10 . In the space closed in this manner, the ferromagnetic
columns 11 are provided so as to protrude from the ferromagnetic plate IO and to face the
diaphragm 4 at the end thereof. The voice coil 12 is wound around the ferromagnetic column 11.
In this type of speaker, the ferromagnetic plate 10g and the ferromagnetic column 11 form a
circuit, and they may be an integral or separate entity. .
In the above-mentioned gun-type speaker, the diaphragm 4 vibrates at a high frequency to emit
sound by folding the simple frequency magnetic field of the voice coil 12 into the 1ffi magnetic
field of the permanent magnet 9. The configuration as shown in FIG. 2 or 83 is also applied to
the diaphragm 4 of the electromagnetic speaker shown in FIG. In this embodiment, the
requirement for thinning (7) is sufficiently satisfied. As described above, according to this
invention, the thickness of the diaphragm can be made extremely thin, and the specific modulus
of the diaphragm itself becomes small, so that the frequency band can be expanded, and it is
possible to use only metal. Since mechanical Q is lower than the case number, sharp resonance
characteristics are obtained, and the speed at which vibrations are transmitted through synthetic
resin is small, so the acoustic impedance can be easily matched with air, and the damping
characteristics can be improved, Fidelity goes up.
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