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JPS5388718

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DESCRIPTION JPS5388718
Description 1, title of the invention
Sealed headphones.
3. Detailed Description of the Invention The present invention relates to a closed type headphone
excellent in sound insulation effect against external noise, and this conventional soundproof type
headphone is described with reference to FIGS. 1 and 2 without losing the sound insulation
effect. Do. In FIG. 1, reference numeral 1 denotes a mounting plate, and a sound hole 2 is formed
in the mounting plate 1. Reference numeral 3 denotes a non-air-permeable pad attached to the
front surface of the mounting plate 1; and 4, a frame attached to the rear surface of the mounting
plate 1. A yoke 5 is fixed to the rear end of the frame 4. A magnet 6 is disposed at the center of
the yoke 6 and a magnetic circuit is constituted by the yoke 6 and the magnet 6. A diaphragm 7
has a voice coil 8 wound around the diaphragm 7. The voice coil 8 is disposed in an annular
magnetic gap 9 of the magnetic circuit. Reference numeral 1o denotes a container-like case fixed
to the rear surface of the mounting plate 1. The magnetic circuit, the diaphragm 7, the voice coil
8 and the frame 4 are covered by the case 1o. 11 is an elastic band, 12 is a cord connected to the
voice coil 8. FIG. 2 shows a mechanical equivalent circuit of a conventional closed-loop dad
Dohon EndPage: 1 shown in FIG. In FIG. 2, F is the excitation force by electric force, Rv is the
electromagnetic braking resistance by the voice coil 8, MD is the vibration system mass, CD is the
compliance of the vibration system, CB is the capacity by closed volume work on the rear surface
of the diaphragm, Cc is The capacity of the sealed volume 1 between the diaphragm 7 and the
tympanic membrane at the time of wearing the headphones is shown. The closed type
headphone has no ventilation hole with the outside when the headphones are attached as its
structure shows, the external noise is isolated, and the noise isolation effect is excellent. Check
the recording status when recording. In order to reduce the noise, only the sound to be recorded
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has to be checked, and a closed type headphone with excellent sound insulation characteristics is
used for monitoring. However, as the equal node circuit in FIG. 2 shows, the high frequency band
limit frequency which can be reproduced becomes almost, and in fact, it is limited to 1 KHz or
less from the relationship of one moving plate mass, capacity CB, CD, Cc and the like. The present
invention, in a closed type headphone excellent in sound insulation effect, enables reproduction
to a high range without impairing the sound insulation effect. . An embodiment of the present
invention will be described below with reference to FIGS. 3 and 4. In FIG. 3 and FIG. 4, the same
parts as in FIG. 1 and FIG. The feature of this embodiment is that a connecting hole 13 is formed
in the mounting plate 1 and the volume 1 in front of the diaphragm and the volume 1 in the case
10 are connected via the connecting hole 13.
The connection hole 13 may be cylindrical as shown in FIG. 3, or may be an annular cylinder, and
if the mounting plate 1 is thick, holes may be formed in the mounting plate 1 It is. Further, it is
possible to form a connecting hole in which a vibrating membrane is stretched, and to connect
two spaces via this connecting hole. FIG. 4 shows a mechanical system equivalent circuit of the
embodiment shown in FIG. FIG. 6 shows another embodiment of the present invention. A
different point from the embodiment shown in this embodiment and the embodiment shown in
FIG. It is a link between work 'and work'. In the embodiment shown in FIG. 6, a part of the sound
wave emitted to the front of the diaphragm passes through the connecting hole 13 of the mass
reactance component and passes through the small volume spacecraft 1st order the acoustic
tube 16 of the mass reactance component Through to reach the space I '. The mechanical
equivalent circuit of this embodiment is shown in FIG. In FIG. 6, mp is a mass reactance exhibited
by the acoustic tube 16, Cp is a capacitive capacitance exhibited by a small volume work, and
mp2 is a mass reactance exhibited by the connection hole 13. A low pass filter is realized by mpl,
1np2, Cp. Is configured. Since the closed type closed headphones shown in FIGS. 1, 3 and 6 use
the compliance control region, flat characteristics are reproduced from the low frequency region,
but the peak is from 500 Hz to 1 kHz. It has become a difficult characteristic to reproduce more
frequencies. B of FIG. 7 is the characteristic of the closed type headphone of the present
invention shown in FIG. 3, and since it is not compliance control, reproduction of the extremely
low frequency range can not be performed, but the high frequency range can be reproduced flat.
That is, the closed type headphone of the present invention is a conventional closed type. The
sound insulation characteristic is excellent as in the case of the dophone, and the reproduced
sound pressure characteristic is flat to the high frequency range as in the open type headphone
which is velocity velocity sugar. Therefore, the closed type headphone of the present invention is
not influenced by external noise, and can reproduce a clean voice rich in presence. In FIG. 7, C is
the characteristic of the closed type headphone of the present invention shown in FIG. 6, and the
headphone characteristic is a bimodal characteristic having two peaks between 2 and 6 kHz.
When listening to the sound radiated from the speaker, the sound pressure frequency
characteristic added to the eardrum of the listener, the auricle of the listener, the ear canal, etc.
EndPage: 2: A bimodal characteristic is obtained.
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According to the closed type headphone of the present invention shown in FIG. 6, although it is a
closed type headphone, it has both characteristics similar to the speaker listening and can
reproduce a sound field close to a real sound field. As described above, in the closed type
headphone of the present invention, the attachment plate is provided with the connection hole or
the connection hole in which the vibration film is stretched, and the space of the front surface of
the attachment plate and the case of the back surface of the attachment plate According to the
present invention, the present invention has an advantage of being able to reproduce up to the
high frequency range without impairing the sound insulation effect of the closed type
headphone.
4. Brief description of the drawings Fig. 1 is a cross-sectional view of a conventional closed type
headphone, Fig. 2 is a mechanical equivalent circuit diagram of the same closed type headphone,
and Fig. 3 is a closed type headphone according to one embodiment of the present invention. FIG.
4 is a cross-sectional view, FIG. 4 is a mechanical equivalent circuit diagram of the same closed
type headphone, and FIG. 6 is a sound pressure frequency characteristic diagram of the
headphone according to another embodiment of the present invention. 1 ...... mounting plate, 2
...... sound hole, 3 ...... pads, 4 ...... frame, 6 ······ yoke, 6 ... ... Mak net, 7 ...... vibration plate, 8 ......
voice coil, 9 ...... magnetic gap, 10 ...... case, 11 ... ... band, 12 ...... code, 13 ...... connection hole, 14
...... cylinder, 15 ...... hole. Name of agent Attorney Nakao Toshio Nakao 1 person Figure 1 Figure
2 Figure 3 End Page: 3 Figure 5 Figure 6 Figure 7 End Page: 4
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