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ゝ、。 1 Title of the Invention ■ Japanese Patent Application
Laid-Open No. 51-146202 公開 Published Japanese Patent Application No. 51. (1976) 12.15
Specification 1, Title of the Invention 1, Title of the Invention
Headphones [phase] Japan Patent Office-4V
3. Detailed description of the invention The present invention relates to headphones 1 so-called
stereo sound listening to listen with ordinary speakers; differences between listening to sock and
so-called listening to listen to with headphones with less difference, listening to headphones as
much as possible The purpose is to reduce it. In general, when reproducing with a normal
speaker, it is possible to make the sound pressure-frequency characteristic of the speaker eflat in
the entire range up to 20 KHz. However, even if the speaker has such a flat frequency
characteristic, as shown in FIG. 1, the speaker 301 of the listener 2! : Place it forward. When
measurement is made with a probe microphone at the entrance of the ear canal of listener 2, it
has peaks around 2KH3 and 4 phantom m due to the diffraction of sound waves by the nine
resonances of the ear canal and the diffraction phenomenon by the auricle, and the peak value is
low. The sound pressure-frequency characteristic has a level difference between 6 and 17 dB.
Therefore, when listening with headphones, the headphone itself has such sound pressurefrequency characteristics in advance. With an irresistible trap. It can not be performed as natural
listening as so-called stereophonic listening. The present invention obtains headphones having
the above-described sound pressure-frequency characteristics by appropriately setting the values
of the acoustic resistance of the damping plate constituting the headphones and the values of the
inertness and the like by the holes provided with the ears (C. An embodiment of the present
invention will be described with reference to FIG. 2 and the following figures. In FIG. 2, 3 is a
support portion, 4 is a head // case slidably mounted on the support portion 3, 6 is provided on
the front face of the Kegos 4, and has an elasticity such as 0EndPage: 1 urethane foam. , 5a, 5b
are holes formed in the base 6, e is a plate having a center ball e & 6b is a cow-center hole of the
center ball 6a, 7 is a magnet, 8 top plate, 9 is a frame, 1Q is a vibration 11 is a voice coil
disposed in the magnetic gap formed between the center ball 6a and the top plate 8, 12 is a
damping material housed between the case 4 and the speaker, 13.14 is a diaphragm 1o The air
chambers 16 in front and back are the damping material provided at the tip of the center ball 6a.
Ji mass of Isukoiru 11, rB the acoustic resistance acoustic resistance by rAt Mimito 1G by the
braking member 15, the acoustic resistance by damping material 12 rc, 1 against 6 hole 5a.
5bによるイナータンスをml、m2. The acoustic capacity of the air chamber 13 is 01.
Assuming that the acoustic capacity of the air chamber 14 is C0, the radiation impedance is zA,
and the driving force applied to the vibration system is y, the equivalent circuit of FIG. 2 is as
shown in FIG. And, in the embodiment of the present invention, by changing the inertance mA by
the central hole 6b of the center ball 6a, a beak is made in the vicinity of 2KHK, and by changing
the inertness-9m2 by the holes sa and sb of 1 per 6 J) Create a beak at around 4: KHz and
further control the acoustic resistance τAlrBjτθ value to apply 2 KHz, 4 KHz and overall
damping, as shown by the solid line in Fig. 4, with peaks at 2 KHz, 4 KHz It was possible to obtain
a sound pressure-frequency characteristic such that the level difference between the peak value
and the low range is 6 to 1 TdBo threshold. The broken line in FIG. 4 shows the characteristic in
the free sound field in the speaker arrangement as shown in FIG. As a result, the sound pressurefrequency characteristics of the head phone can be made close to the sound pressure-frequency
characteristics at the ear of the free sound field. Of course, the same characteristics can be
obtained by changing the inertness and the acoustic resistance of the cocoon, but any) hKL also
positive from 1.61; At the threshold. っ、。 ピーク! It was confirmed that if the level difference
between the low band and the peak value is 6 dB to 1 y dB, it can be heard in the same sense as
the natural sound field. In the embodiment, speakers are arranged as shown in FIG. 1 in the
anechoic chamber, and a probe microphone is placed at the entrance of the ear canal to
approximate the sound pressure-frequency characteristics measured, but it has an acoustic
impedance equivalent to this. The same is true even if the characteristics measured by the
dummy head and the coupler are made close to each other. 1) As mentioned above, the present
invention creates the characteristics of the transfer function up to the tympanic membrane by
creating a characteristic by the diffraction of the head, the diffraction 1 of the auricle, and the
resonance of the ear canal in the headphone characteristics. Since the sound transfer function is
matched to the transfer function of the head, the sense of discomfort + i sense of harmony that is
heard from the top of the head as if the sound image is in the center of the head like the
conventional headphones The sound can be heard as if the sound image is out of the head), a
sense of distance to the sound image can be obtained, and a natural sense of hearing can be
obtained. t た。 Headphones with such characteristics, left and right inputs, signals given by
crosstalk and time delay signals, etc. can create a sound field equivalent to stereo micro hair in a
free sound field.
4. Brief description of the drawings. FIG. 1 is a flat vH diagram showing the speaker arrangement
of the IRI property of the headphones according to the present invention and rounding-off, FIG. 2
is a sectional view showing the headphones in one embodiment of the present invention, FIG. 7 is
an equivalent circuit diagram of FIG. 7 and FIG. 4 is its sound pressure-frequency characteristic
diagram. 1 ... speaker 2 2 ... listener 3 I ... support part 4 ... headphone case 6 ... 1 1 place 5 heat,
sb ... · · · · · · · · · · · · · · · · · Center ball, e. Name of agent Attorney Nakao et al. 1 person EndPage: 2
Fig. 1 Fig. 2 Fig. 3 Fig. 5 134 Fig. 6 Other inventors and agents other than the above \ "JEndPage