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FIELD OF THE INVENTION The present invention relates to an earphone for generating sound by
vibrating an opposing diaphragm with an electromagnet and a permanent magnet provided so as
to surround the electromagnet with a space between the electromagnet and the air 21 / -7. It is a
thing. Conventionally, earphones are widely used as monitors for radios, tape recorders,
televisions and the like. There are two types of sound producing bodies for earphones: magnetic
type, which is mainly used for earplugs, and dynamy, which is mainly used for auricle insertion
types called inner phones, and paste types. The earplug-type earphones, which are inserted into
the ear canal, are being avoided because of their poor wearing feeling and the age of the design
image, and instead, the inner-phone type is mainstream. SUMMARY OF THE INVENTION
However, while the inner-phone type has good design, fit, and sound quality, it has a drawback
that its structure is complicated and hard to make, and its cost is very high. For this reason, as
shown in FIG. 4, an earphone has been devised in which an easy-to-make, easy-to-use, low-cost
magnetic type carrier 3 is filled with an inner-phone type housing. The phone type is not
practical because the sound leaks from the pinnae and the attenuation in the low frequency
range is particularly large, and the sound quality is even lower than that of the earplug type
earphone. The electric equivalent circuit of the acoustic system is shown in FIG. 6, and the sound
pressure frequency characteristic is shown in the curve 1 of FIG. In FIG. 5, m is the mass of the
diaphragm, C1 is the acoustic capacity of the plate moving plate, r is the radiation impedance of
the diaphragm C2, C3 is the space a in FIG. It is the acoustic resistance seen from the sound hole
8 in the figure to the outer side. Means for Solving the Problems In order to solve the above
problems, the earphone of the present invention is provided with an electromagnet constituted
by a hollow iron core having a through hole at both ends of a cylindrical portion and a winding,
and surrounding the electromagnet A permanent magnet, a diaphragm opposed to the
electromagnet through a gap, a holder for holding the electromagnet, the permanent magnet and
the diaphragm to form a sound generator, and an acoustic wave in which the diaphragm is
separated from each other It is characterized in that it comprises with the housing which forms a
space. When a terminal plate for holding a lead wire relaying the winding of the electromagnet
and the input signal is provided in the housing, a through hole opposed to the through hole of
the hollow iron core is provided in the terminal plate. Be done. Operation According to the
present invention, in the rear space of the diaphragm, the cylindrical space of the hollow iron
core serves as an acoustic mass, and the space which is quadruple over the holder and the
housing behind the cylindrical space. Serves as an acoustic capacity, the acoustic reactance of the
earphone can be enhanced by setting the acoustic reactance to resonate at a desired low
EXAMPLE Hereinafter, the earphone according to the example of the present invention will be
described with reference to the drawings. FIG. 1 shows the configuration of the earphone
according to the first embodiment of the present invention, and FIG. 2 shows the configuration of
the ear 5 hen phone according to the second embodiment of the present invention. A hollow iron
core 1 has through holes at both ends of the cylindrical portion, and constitutes an
electromagnet driven with a periodic current together with the winding 2. A permanent magnet 3
is provided to surround the electromagnet. A diaphragm 4 has an iron piece 5 bonded thereto. 6
is a hollow core 1. Permanent magnet 3. A holder for holding the diaphragm 4 and a housing 7
for forming the acoustic spaces a, b, c and d. 8 is a sound hole provided in the housing 7, 9 and
10 are lead wires for relaying input signals, and 11 is a terminal plate for holding the winding 2
and the lead wires 9 and 1o. The electrical equivalent circuit of the acoustic system of the
earphone configured as described above is shown in FIG. This equivalent circuit is a circuit in
which L equivalent to the acoustic mass of the space C and 04 equivalent to the acoustic capacity
of the space d are serially inserted in the equivalent circuit shown in FIG. By setting the
resonance frequency f0 due to the acoustic reactance of L and 04 to a low range where the
attenuation amount is large, it is possible to correct the acoustic characteristics of this earphone
by 6 ии ?7 as shown by curve 2 in FIG. . Effects of the Invention As described above, the
earphone of the present invention can improve the sound quality of an inner phone type
earphone using a magnetic type sounding body, and can provide an inexpensive earphone with a
good design and a feeling of wearing It is a thing.
Brief description of the drawings
FIG. 1 is a sectional view showing an earphone according to a first embodiment of the present
invention, FIG. 2 is a sectional view showing an earphone according to a second embodiment of
the present invention, and FIG. 3 is an earphone according to the embodiment of the present
invention Fig. 4 is a cross-sectional view showing a conventional earphone, Fig. 6 is an acoustic
equivalent circuit of a conventional earphone, and Fig. 6 is a sound pressure of the conventional
and an embodiment of the present invention. It is a frequency characteristic figure.
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