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JPS5631790

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DESCRIPTION JPS5631790
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a sectional front view of a conventional
electromagnetic electroacoustic transducer for bone conduction hearing aid, and FIG. 2 is an
embodiment of an electromagnetic acoustic transducer for bone conduction hearing aid
according to the present invention. FIG. 1
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Ears fit.
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to the improvement
of an electromagnetic type electroacoustic transducer for bone conduction hearing aids, and the
weight reduction of its mechanical vibration system makes it possible to make a change in
weight. Improvement of efficiency and thinning l and reduction of the number of parts 2 sets '' J!
4I The purpose is to reduce the number of man-hours. First, FIG. 1 shows a cross-sectional view
of the structure of an electromagnetic electroacoustic transducer used in a conventional bone
conduction type hearing aid. The magnetic circuit is the same as that used in earphones and the
like, and comprises an excitation unit having an excitation coil 2 wound around a magnetic core
1 and a permanent magnet 3, and a diaphragm 4 made of a magnetic material The magnetic core
1 is disposed opposite to the magnetic core 1 at a fixed distance by a suspension 6 screwed to
the frame by a screw 5. In this structure, a pressure ring 8 is used to attach the ear sleeve 7, and
the suspension 4 with the diaphragm 4; overkill: overrun: overrun: 1,. ---. However, with this
method, the weight of the vibration system increases because of the number of parts. Further, the
size is increased by the size of the retaining ring 8 and the eye, m-IEKmh'h AIe * @. 11. In
addition, vibration system weight increases, so ░ j. ?? 'Reduce the conversion efficiency.
Conversion by vibration system weight 32-1] For the change of efficiency, when used for
eyeglass-type bone conduction hearing aid, a certain amount of force is applied to the transducer
and the human head by the frame of the eyeglasses. In that case, the mechanical impedance of
the transducer's vibration system is equal to the human zero mechanical impedance to avoid
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changes in the characteristics of the transducer when it is applied to the human head and when
the pressure changes. Or you can not make it bigger. To this end, the compliance of the support
system must be reduced. However, in the practical example, due to the relationship between the
reproduction band and the conversion efficiency, the value can not be reduced unnecessarily.
Under such conditions, it was found that the weight of the vibration system greatly contributes to
the conversion efficiency. Therefore, weight reduction of the vibration system can be mentioned
as a big aim of the conversion efficiency improvement. The present invention has been made to
meet these needs, and FIG. 2 shows a structural cross-sectional view of an embodiment of the
converter of the present invention. 1) is different from the conventional one in FIG. 1) in that the
screws 9 for fixing to the ear and the retaining ring 8 in FIG. The suspension 6 is sandwiched
between the two by using screws provided on the ear rest 7 '.
By using this structure, it is possible to reduce the amount of vibration-related dorms by the
amount of two ear fixing screws 1 ', 4', 4 ', 4' and 4 'of the pressing ring, and pressing The
thickness can be reduced by the amount of the ring. Therefore, when the glasses are mounted,
the feeling of use is improved and the appearance can be made clean. In addition, the number of
parts can be reduced by 3 points, which helps reduce the price. In the above embodiment, the
case where the screw formed on itself is used to directly connect the upper part of the diaphragm
4 and the earpiece 7 'has been shown, but the invention is not limited to the screw, and a worker
or a fitting may be used. Also have similar effects. As described above, according to the present
invention, it is possible to obtain an electromagnetic electroacoustic transducer for bone
conduction type hearing aid having various features.
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