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BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an explanatory view showing a general
speaker reproduction state, and FIGS. 2A and 2B are a sound pressure frequency characteristic
diagram and a phase characteristic diagram when listening in the reproduction condition of FIG.
Fig. 3 is an explanatory view showing a general headphone reproduction state, Fig. 4 is a
sectional view showing a conventional headphone device, Fig. 5 is a mechanical equivalent circuit
diagram of the same, and Figs. FIG. 7 is a sectional view showing an embodiment of the
headphone device of the present invention, and FIG. 8 is a mechanical equivalent circuit diagram
of the same. 17 · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · · .... magnet, 23 ...... case, 24 ......
intermediate partition plate, 25 ...... first cavity, 26 · · second cavity, 27.28 · · · · · · · · · · · · · · · · · · · · ·
· · · · · · · · · braking material. Eighth: □ □ □ □ □ □ 4 □ □ □ □ □ □ □ □ □ □ □ □ 局 局
[(u, r) circumference X sheets (tlz)
DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a headphone
device capable of listening to headphones equivalent to natural listening. Fig. 1 shows a speaker
with flat sound pressure frequency characteristics, arranged blue 30 ° forward as with listening
to a normal l- 伜 α / 2- ・ ・ ・ normal dummy, close to a person's turn dummy It is a figure
which shows the state which has arrange | positioned the vibration cage | basket of the
microphone 3 on the tympanic membrane of the head 2. FIG. FIGS. 2A and 2B show sound
pressure frequency characteristics and phase characteristics of the sound detected by the
microphone 3 with the speaker 1 operated in the state of FIG. From such an experiment, when
the microphone 3 is disposed on the eardrum of the dummy head 2 as shown in FIG. 3 and
listened with the headphones 4, sound pressure having duality as shown in FIGS. 2A and 2B is
obtained. If frequency characteristics and phase characteristics can be realized, natural listening
ability similar to listening with a speaker can be obtained even with headphone listening.
Therefore, as a headphone device which does not get tired even when used for a long time and
enables natural reproduction: one having the characteristics shown in A and H of FIG. 2 is
effective. There is a headphone device developed based on FIG. 3. In FIG. 4, 1J is an ear pad, 6 is
a front plate for attaching a speaker unit, 7'1'i is a yoke constituting a speaker unit, 8 is a spacer,
9 is a sliding rod with a voice coil formed by printing, 10 + 4. The magnet 11 is a case for
covering the speaker unit, 12 is an inner partition plate provided in the case 11, 13 is a first
cavity formed by the speaker unit and the inner partition plate 12, and 14 is an inner partition
plate 12 And a second cavity formed between the case 110 and the back of the case, 16 are
formed in the medium pressure cutting plate 12, communicate between the first and second
cavities 13.14, and function as an acoustic tube with mass reactance Transmission hole 16: A
transmission hole provided on the back surface of the case 11 for moving a sound tube with
mass reactance. In the above configuration, the magnet 10 is alternately arranged up and down
with the N pole, the S pole and the N pole, and the magnetic flux from N4 to S pole and Sfi to N-i
makes the voice coil vertically provided on the vibrating film 9 vertical. Acting, the vibrating
membrane 9 vibrates up and down according to Fleming's left hand F, the law. FIG. 6 shows a
mechanical equivalent circuit diagram of the headphone device shown in FIG. 4, where F is the
motive force by electric force, Rv is the electromagnetic braking resistance by the voice coil, hJp
is the vibration system 醍 A, C1) Vibration system D compliance, CB1ri vibration abs. 9 rear
surface O-pack and 19th cavity 413D volume Combriac, MB, 7i Weighing actance by through
hole 15 of partition 12 provisionally, CF is a dynamic film 9 and auricle The compliance of the
volume formed by 7C etc., CB2 shows the compliance of the volume of the second cavity 14, and
MB2 shows the mass reactance by the transmission hole 16 of the case 11.
The parallel resonance of mass reactance MB1 by the transmission hole 15 and the volume f7 of
the tenth cavity 13 and the volume f7 of the tenth cavity 13 and the transmission hole 15 of the
middle partition plate 12 makes the bimodal structure of FIG. The sound pressure frequency
custom-made with the property is realized, and by making the second cavity 1408 product
compliance CB2 and the case 117) mass reactance 14B2 by the transmission hole 16 parallel
resonance more than two, by making it lower than the resonance frequency, The rising of the
first peak is 曽, 5 · −, and the phase curve of the broken line in FIG. 6B is obtained. However, in
the headphone device of the conventional configuration, as seen from the mechanical unequal
circuit in FIG. 61, no damping agent is present, so there is no resistance R in the acoustic circuit.
Therefore, there is a drawback that the same natural and high sound as the speaker can not be
hidden. The present invention eliminates the above-mentioned conventional drawbacks. An
embodiment of the present invention will be described below with reference to FIGS. 7 and 8.
FIG. Fig. 7 shows the structure of the present invention D headphone device S, 17 is an ear pad,
18 is a front plate for attaching a speaker unit, 19 is a yoke constituting a speaker unit, 20: a
spacer, 21 is formed by printing. The same video camera 22 having a voice coil, a magnet 22 ′
′ and a magnet 23, a case 23 coupled to cover the speaker unit, 24 is provided in the case 23,
and the speaker unit and the back surface of the case 23 An inner partition plate to be divided,
26 is a first cavity on the rear surface side of the moving film 21 formed between the D middle
cut temporary and the speaker unit, and 26 is a back direction of the inner partition plate 24 and
the case 23 Are formed between the second cavity c), a transmission hole through which a mass
reactance acoustic tube provided in the inner partition plate 24 and a cavity 271 ′ ′ is
recommended, 28 is a case of Provided on a surface, the transmission hole for the movement of
the acoustic tube with a mass reactance, 29 is a damping material such as a nonwoven fabric
attached to the transmission hole 27.28. In this configuration, the operation principle is the same
as in the conventional case O, but as mechanical equivalent equivalence, as shown in FIG. In the
eighth issue F is the excitation force by the upper air force, Rv'rl voice coil: electromagnetic
braking resistance by this, MD is the imaging system mass, CD; is the compliance of the
oscillation system, cB1ha dynamic pattern 21 after the moving surface 21 26 Volume Combriak,
mass reactance by MBIu partition plate 24 through holes 27, CF is the compliance of the volume
formed by diaphragm 21 and ear shells etc. CB2 is the second cavity 26D compliance, hIB2
through hole 28 A mass 7, an actance, R indicates a braking # 29.
7 By providing the damping ring 29 in the transmission hole 27.28, the sound pressure
frequency characteristic and phase characteristic having a bimodal property as shown by the
solid line of 4618 and B become the poet of FIG. 2A and 2B. Is Sio; Therefore, according to the
headphone device of the present invention, although it is headphone listening, the same effect as
natural listening can be obtained, and it is possible to enjoy extremely natural reproduced sound
without being tired even if looking at nodphone listening to long interval 4 Yes, it is a dog of
practical value.
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