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DESCRIPTION JPH04347997

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DESCRIPTION JPH04347997
[0001]
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a
headphone which is used by being attached to the auricle.
[0002]
2. Description of the Related Art In recent years, headphones are not only large-sized ones that
are crimped from the outside of the auricle with a conventional headband, but the housing is
made smaller using a small speaker unit and mounted in the auricle There are a lot of structures
to listen to.
[0003]
However, in the conventional configuration as described above, the housing can not fit in the
auricle if the outside diameter of the housing for housing the speaker unit is not at most about
18 mm.
However, when the speaker unit is small, the reproduction limit of the bass does not become so
low. Therefore, a method of providing a duct in the housing at the rear of the speaker to extend
the low range has been often used.
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[0004]
As disclosed in Japanese Patent Application Laid-Open No. 62-47298, there is an example of a
two way system in which a small high sound speaker unit is disposed on the front of the housing
and a large low sound speaker unit is disposed on the rear of the housing.
[0005]
However, in the above-mentioned conventional method, although extension of some low range is
recognized in the former duct system, there is a limit because the speaker unit is originally small.
[0006]
The latter two-way system can lower the low frequency resonance frequency using a large bass
speaker unit, but has the problem that the number of speakers increases and the structure
becomes complicated. .
[0007]
SUMMARY OF THE INVENTION It is an object of the present invention to solve the abovementioned conventional problems, and to provide headphones which can be reproduced to a
lower frequency than in the prior art while at least the part entering the auricle is of the same
size as the prior art.
[0008]
SUMMARY OF THE INVENTION In order to achieve the above object, in the headphone according
to the present invention, the front part having a front sound hole is a rear part in a housing
whose outer dimension is at least an outer dimension enough to be inserted into the auricle. A
speaker unit is disposed in a plurality of sound paths disposed between the speaker unit and the
front sound hole, and passively vibrated by the output of the speaker unit between the front
sound hole and the plurality of sound paths It is configured to provide a dynamic diaphragm.
[0009]
[Function] With the above configuration, the present invention reproduces enough bass by the
speaker unit larger than the front part of the housing that enters the auricle, and a plurality of
sounds generated from the diaphragm of the speaker unit are plural. Separate from each other
and are guided forward without interfering with each other, where by vibrating the passive
diaphragm, the passive diaphragm acts as a new sound source, especially for the high-tone part,
and the sound is audible By reaching the inside, an effect is obtained that the adjustment of the
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frequency characteristic is also facilitated.
[0010]
Embodiments of the present invention will be described with reference to the drawings.
[0011]
FIG. 1 is a side sectional view of a headphone according to an embodiment of the present
invention.
In the figure, a frame 4 of a speaker unit 3 with a diameter of about 16 to 19 mm having a
diaphragm 3a is held between a front housing 1 and a rear housing 2, and the diameter of the
front surface of the front housing 1 is about 14 to 16 mm. The net 5 is made of porous metal or
the like, which is easily and reliably inserted into the auricle and prevents the ingress of dust etc.
by the small front sound hole 5a on the front surface, The front periphery is covered with a ring
6 made of, for example, rubber or soft plastic for the purpose of improvement.
On the front surface of the diaphragm 3a of the speaker unit 3, the lotus root shaped sound
paths 7, 8 provided in the front housing 1 lead forward without communicating with each other,
and the front part of the sound path 7 has passive vibration The front part is closed by a plate 9,
and the portion of the sound path 8 leads to the sound hole 5a.
The sound paths 7 and 8 are filled with a sound absorbing material or damping material 10 as
required.
The characteristics may be adjusted by changing the material depending on the part.
Also, the periphery of the front of the sound path 7 may be an equalizer according to the curved
surface of the passive diaphragm 9.
The rear housing 2 has a cavity 11 at the rear of the speaker unit 3 therein, a cord drawer 12 at
the bottom, and an input cord 14 protected by the bushing 13.
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[0012]
When the input signal is applied from the input code 14 to the speaker unit 3, the diaphragm 3a
of the speaker unit 3 vibrates, and the sound paths 7, 8 are formed. Apply sound pressure
forward through the.
The sound pressure passing through the portion of the sound path 8 directly reaches the inside
of the auricle through the front sound hole 5a, but the sound pressure passing through the sound
path 7 vibrates the passive diaphragm 9 to newly add the passive diaphragm 9 Sound pressure is
generated as a sound source. Since the plurality of sound paths 7 do not communicate with each
other except near the passive diaphragm 9 as described above, the sound pressures in the
respective sound paths reach the passive diaphragm 9 without interfering with each other.
Therefore, it is possible to prevent the peak dip of the frequency characteristic due to the
interference, particularly in the high-pitched part having a short wavelength. The frequency
characteristics of the diaphragm 9 can be controlled by its thickness, shape, concentric
corrugation, radial or spiral edge processing, etc., so that the desired characteristics can be
produced complementarily to the characteristics of the speaker 3.
[0013]
Although the passive diaphragm 9 has been described above as being present only on the front
surface of the sound path 7, it may be on the front surface of the sound path 8.
[0014]
It is also possible to provide the rear housing with an appropriate rear sound hole, if necessary,
to improve the characteristics and further to provide a conventionally known duct.
[0015]
Further, the structure may be changed or simplified within the scope of the present invention.
[0016]
As described above, the headphone according to the present invention is small in size that can be
inserted and installed in the auricle, but by using a speaker unit having a large diaphragm that
can not be inserted in the auricle. Also, it is possible to reproduce low tones comparable to large
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headphones, and guide the sound to the front by multiple sound paths, and the small passive
diaphragm provided on the front is vibrated by the output of the speaker unit, especially for the
high sound part It functions as a new sound source, prevents peaks and dips in the frequency
characteristics due to interference between sounds emitted from the diaphragm of the speaker
unit located at a distance from the inside of the ear, and it is easy to adjust the frequency
characteristics It provides excellent headphones that exert effective effects.
[0017]
Brief description of the drawings
[0018]
1 is a side sectional view of a headphone according to an embodiment of the present invention.
FIG. 2 is a front sectional view showing the AA 'section in FIG.
[0019]
Explanation of sign
[0020]
Reference Signs List 1 front housing 2 rear housing 3 speaker unit 3a diaphragm 5a of speaker
unit 3 front sound hole 7, 8 sound path 9 passive diaphragm
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