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JPS5298515

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DESCRIPTION JPS5298515
Description 11 Title of Invention
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3. Detailed Description of the Invention The present invention relates to headphones, in
particular, a diaphragm comprising a vibrating membrane stretched between a front side porous
plate and a rear side porous plate acting as a pair of magnetic poles or electrodes. The antiresonance li 1 by forming the diameter of the circular part of the transparent # 3A in the surfacedriven type headphone in the temporary side porous plate to a diameter smaller than the
diameter of the diaphragm at the ratio of rgT feet. It is an object of the present invention to
provide a headphone configured so as to effectively suppress only the ceramic wave number
characteristic of the middle and high frequency parts by lowering the wave number, and to
obtain a rope wave number characteristic favorable to hearing. Currently, headphones utilizing
membrane vibration are roughly classified into electrodynamic headphones and ? IIt
headphones. FIG. 1 shows a conventional full-field drive ship 1 in the form of headphones 1, and
vibration -3 with a conductor pattern 2 formed on the surface is stretched between the front side
pole plate 4 and the rear side am plate 5 is there. A large number of magnet pieces 6 are
arranged in alignment on opposite sides of the pole plates 4 and 5 and / or? ! The rVIi electrode
plates 4 and 5 respectively have a large number of small air flow holes 7a and 7b. Further, an
acoustic damping material 8 such as cloth is provided on the back strike side of the pole plate 5.
Further, 9 is a headphone case and lo is an ear pad. Here, when an audio signal is applied to the
conductor pattern 2, the vibrating membrane 3 vibrates according to the action of the conductor
pattern 2 and the magnetic field formed by the magnet pieces 9. In the headphone 1 described
above, the vibrating membrane 3 is an ultra-thin polyester film having a diameter of 66 ?m and
a thickness of 4 ?m, and the thickness tri6-5tsn of the conductor pattern 2. Further, the
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protrusion size of the magnet piece 6 is 21 111%, and the thickness of the pole plates 4 and 5 is
1 m, and the gap size to size of EndPage: 1 between the magnet piece 6 and the film 3 is 0.3.
When the pigeon wave number inertia of the headphone 1 configured as described above is
laughed out by means of the pseudo-ear device, this headphone 1 exhibits a special number of
waves indicated by a song @l in FIG. As is clear from the music Ml, the sound pressure level is
substantially constant at IKHz1, but shows an increase v't- of 2 to 6 dB in the middle high range
of lKH2 to 5KHz. In the headphone 1, even when the narcissus gland and the conductor pattern
thickness t are changed, the above-mentioned tendency does not change only by slightly
fluctuating the wave number region where the sound pressure increases. The sensitivity to the
sound of the human ear is greater for medium to high frequency ranges of 1 to 5 KHz, as is
known from the ten thousand fretture-manson curve etc. For this reason, it is ideal that the
headphone has a single wave number characteristic in which the sound pressure level of 1 to 5
KHz tends to fall somewhat in one history or the whole sound pressure level is constant.
However, when the upper headphone 1 is used for convenience, the middle and high frequency
band is emphasized and heard, and the low frequency band of 300 Hz or less and the low
frequency band of 7 KHz or more are weakened and the sound source is accurately grasped.
There was a serious drawback that could not be recognized. Description of is omitted. The
vibrating film 12 is a plastic thin film or an electretized plastic thin film formed by vapordepositing a metal such as aluminum on the surface, and is provided between the main plate and
the pair of fixed ? pole plates 13 and 14. The 1i 5 I constant electrode plates 13 and 14 have an
action tL for giving electric energy to the vibrating membrane 12, and a large number of small
air flow holes 15a and 15b. In the headphone 11 of this configuration, since a diaphragm with an
extremely thin thickness is used as in the headphone 1 described above, the acoustic
characteristics of the headphone 11 are similar to those of the headphone 1 9, its sound pressure
level fd shows ups and downs in the mid-high range. Therefore, even if the headphone 11 is
small, the sound source can not be accurately grasped and recognized. The upper six headphones
1 and 11 are represented as an equivalent circuit shown in FIG. In the figure, F is the driving
force, so, mo and ro are the stiffness of diaphragm 2 and 12, respectively, the added mass and
resistance, and Sp is diaphragm 3 (12) and pole plate 4.5 (pole plate 13. 14) the space volume
between (by stice failure, m, r, (? ? 6 d of a large number of air flow small holes 7 a ('l' 5 a) of
the electrode plate 4 (electrode plate 13)? ? ? ? ? ? ? nc nc nc nc nc nc ? ? ? ? ? ?
? ? ? ? ? ? ? nc nc M M M M M M M M M M M M M M M M M M M M M M M M M M M
M M M M M M M M M M M M M M M M M M M M M M M M?? ? 5 (it (14) Q2 ? A4 ?
4't7b (15b) ?, ?! # Represents the added mass and resistance which is the combined mass
when emitting to the damping N '8 and a temporary universal field and the added resistance fyc.
Note that the sound pressure generated in the artificial ear is a front air chamber (volume formed
by the ear pad IOK). The stiffness S that is a combination of and the simulated ear impedance.
The sound pressure P is raised at the middle high frequency 1 lake wave number (2 to 5 Dlz)
based on the first series resonance frequency f of the yarn. On the other hand, in the headphones
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1 and 11 of the above configuration, the parallel resonance frequency of Sp and 8'lr, that is, the
anti-resonance pigeon wave number fA is in the range of 10 to 15 KHz, VC 6, 6 The antiresonance wave number may work effectively to boost up Rt first series resonance 'f.
For this reason, in the above-mentioned headphones 1 and 11, an attempt is made to increase
the thickness t-1 of the unit with braking 8 but this acoustic damping material 8 has an
additional mass in the upper-recording circuit. M, not equivalent to resistance R1, equivalent to f,
m 8 and flat ratio of heat wave characteristics, furthermore, the back pressure level in the middle
and high range is + U Compared with the castle it is impossible to reduce the water flow idX%.
Non-invention removes the above part Ku-point (1-p) (p. r For the example. 5th! The longevity of
the headphone according to the present invention is a longitudinal cross-sectional view of an
example of EndPage: 2 of Fig. 6 (Fig. 6N and Fig. 6). In FIG. 5, in the all- @ drive motion Wt type
headphone 20, the conductor pattern 21i is formed in the face direction and the diameter is 66
m (7). In the dark sky 1i1 and fC. A plurality of magnet pieces 25 are arranged in a row in the
IQII vC for cutting the phases of the pole plates 23 and 24. In FIG. 6 (a number of air Jf and
through holes 26a and 26b are formed in a row in the valley magnetic pole plates 23 and 24 so
as to be combined with Al). 27 is a ring-shaped shielded circle forming the mourning 5 according
to the present invention, and fixed in close contact with the back side of the rear @ Wi plate 24
as shown similarly in FIGS. It is. In addition, this shielding circle! 127 is a non-air-permeable
urethane foam having an outer diameter of 66, an inner diameter (d) 401141, and a thickness of
05-, and the pole plate 24 is acoustic only at the circular portion 28 of diameter d of its central
portion The air flow small holes 26b emit sound through all the holes. Hereinafter, the circular
portion 28 is referred to as radiation (3), and the diameter of the circular portion is referred to as
a radial diameter. Also, on the back circumference side of the occultation disk 27, a cloth
recording and writing material 29 is stretched. 1, 30 is a headphone case, 31 is an ear pad and
the headphone 20 of the above configuration has a diameter d of the radiation surface 28 of the
return side magnetic plate 24 smaller than the diameter of the peristaltic film 22, li! The back
surface l1 o 91111 C metamorphism ratio of the moving film 22 is formed, and the sound 411
transformer 32 of d is formed. Further, the headphone 20 is coated as an equivalent circuit
shown in FIG. In the figure, the same reference numerals as in FIG. 4 denote the same parts as
those shown in FIG. In FIG. 7, T represents a reverberation transformer t-, in which the area of
the vibrating membrane 22 and the radiation surface 280 surface area ratio are the metamorphic
ratios. In FIG. 7, when the acoustic transformer T is eliminated, the equivalent circuit shown in
FIG. 8 is obtained, and in the figure, Mr 'and Rr' are added to the radiation in a state including the
transformer Tt-- Indicates mass and resistance.
Also, in this equivalent circuit, the first series resonance fby, the ratio ('! ???? The value of 6
lua 'c at -66, 40, and the value of 710 quality firefly Mr' become 7.4 times of the front self-added
purchase amount M, and the anti-resonance frequency fA 'becomes the anti-resonance frequency
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f in the conventional headphone Compared to (= lO-lsKHz), it is approximately 4 Ki (z). Therefore,
the antiresonance frequency fA 'is the first series frequency f. Approximate to ', and consistent
with history, the first direct co-carrier wavenumber f. The boost of the sound pressure level in the
vicinity of 'and will be suppressed. When the headphone 20 is operated in the same pseudo ear
placement as in the case of KJ, the sound pressure level rise is suppressed by the action of the
anti-resonance frequency in the headphone 20 ri, the middle high frequency band, The same
wave number characteristics shown by the curved edge 1 shown by a solid line in FIG. 9 are
shown. As apparent from the comparison with the ceramic wave number characteristic music 1
Ml of the conventional headphone shown by this music mat-wm, the increasing tendency in the
middle high range (2 to 5 Kr (z)) of the sound pressure level is suppressed, and the sound
pressure level in history (1. It also shows a tendency to decrease slightly in the above-mentioned
airspace. Further, by the reduction of the antiresonance frequency f6 ', the sound pressure level
is suppressed and reduced in the band area. The headphone 20 according to the above 6a'5A
embodiment of the present invention has a preferable sound pressure level-veno V-same wave
number characteristic r in the sense of m. . Further, in the above equivalent circuit, Rr (14, '), so
the thickness dimension t2 of the 10 damping material 29 of the headphone 20 is the thickness
dimension t of the 1 till system 1 id J material 8 of the conventional headphone 1.11. , And
headphones 20t--it can be smaller and lighter. Next, a second embodiment of the headphone
according to the present invention will be described with reference to FIG. 10 together with the
same reference numerals as in FIG. 5 for the same components as in FIG. The description is
omitted. In this full-featured 'g-type headphone 35, the rear IIii J magnetic 1 plate 36 is formed
with air flow small holes 26blH only inside the diameter d (= 40 mm) 9 yen, and the outside M is
a non-porous flat plate Thus, the above-mentioned shielding disk 27t-omitted 0 means that the
acoustic transformer 38 having a metamorphic ratio D2: d2 is formed by the vibrating film 12
and the acoustically transparent radiation surface 37 of the pole plate 36. This headphone 35
exhibits the same good pre-pressure level-wave number characteristic as indicated by the curve 1
in FIG. The third embodiment of the headphone according to the present invention will be
described with reference to FIG. 11. The same reference numerals as in FIG. 5 denote the same
parts in FIG. , The description is omitted.
Non-air-permeable double-layered adhesive tape with 41ri outer diameter of 66 ? and inner
diameter of 4?0? in this full drive drive type headphone 40, and it is stuck on the back side of
the rear side magnetic pole plate 24 . The bi-directional sliding tag 41 closes the air flow small
hole 26bt "located outside the circle with the medium diameter of the pole plate 24 of 40-", and
the acoustically transparent radiation @ 42 is in the range defined by the circle of diameter d.
Specify. Further, on the other side of the tape 41, a sound damping material 29 is adhered.
Accordingly, also in this headphone 40, the acoustic transformer 43 similar to the above is
formed by the vibrating membrane 22 and the radiation surface 42, and this headphone 40 is
good as shown by the curved edge B in FIG. Sound pressure level-frequency characteristics.
Although the above-mentioned% embodiment is applied to the full drive electrodynamic type
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headphone, the non-invention can be applied to the electrostatic headphone as well. It shows the
characteristic shown by. Further, as the diameter between the radiations is reduced in the upper
i-mitani headphone 20, 35. 40, the anti-resonance frequency fA is further lowered, and the range
and the degree of the back pressure level curved edge concave portion are increased. However,
considering that the sound pressure level-frequency a characteristic is not extremely
deteriorated, the minimum limit of the diameter of the radiation surface with respect to the
diameter 66 of the vibrating membrane 22. The values may be somewhat different depending on
other acoustic constants, but may be set at 25 for the time being. Further, in headphones having
different diameters of the vibrating film, the radiation diameter of the radiation surface formed
on the pole plate 24 should be determined according to the diameter of each vibrating film so as
to coincide with the formation ratio 66.40 of the acoustic transformer. Thus, the valley
headphones exhibit a good sound pressure level-frequency characteristic as indicated by curve 1
in FIG. If the member defining the radiation l] kI on the back side of the vibrating membrane 22
is disposed away from the rear side magnetic pole plate 24 in the back direction, the effect is
reduced, and in order to obtain predetermined characteristics, In order to require the restraint wJ
material 29, in the above-described valley embodiment, the magnetic pole plate 24 itself is a
summer-type rolled flat plate or a magnetic pole plate by making a predetermined member close
to the back side of the pole plate 24. The 24th digit (turn) defines radiation ?. In addition to this,
in the headphones 20 and 35. 40 of the working example 9 and the valley embodiment, the
acoustic damping material 29 is made thin (t2). As described above, according to the headphone
according to the present invention, a film I having a vibrating film as a vibrating body which is
stretched between the front side porous plate and the rear side porous plate acting as a pair of
magnetic poles or electrodes In the drive-type headphone, since the acoustically transparent
circular portion in the section rear side porous plate has a smaller diameter at a predetermined
ratio compared to the diameter of the diaphragm, it has a relatively simple configuration. The
anti-resonance frequency can be lowered to flatten and further reduce the sound pressure level
in the upper frequency band of the upper shell area, so that a hearing-favorable characteristic
can be obtained, and the liar corrects the source. It can be grasped and recognized, and
furthermore, the amount of use of the acoustic damping material can be small, and it can be
manufactured compactly and inexpensively.
4. Brief description of the drawings. FIG. 1 is a longitudinal sectional view of an example of a
conventional electrodynamic headphone, FIG. 2 is a diagram showing sound pressure levelpermanent mantissa characteristics of the headphone shown in FIG. 1 is a longitudinal sectional
view of a conventional electrostatic headphone, FIG. 4 is an equivalent circuit diagram of the
headphone shown in FIG. 1 and FIG. 3, FIG. 5 is a longitudinal Il1 of the first embodiment of the
headphone according to the present invention. Figure 6 (A> and (Bl is a plan view and a
longitudinal sectional front view of a partial assembly such as the rear side porous magnetic pole
plate in FIG. 5 roughly, FIG. 7 and FIG. Show? Fig. 9 shows the sound pressure level-frequency
characteristics of the headphone shown in Fig. 5, and Figs. 10 and 11 show the second and third
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embodiments of the headphone according to the present invention. The front view of the 20.35.
40--Total curve drive electrodynamic type headphone, 21-Conductor pattern, 22 ... Vibrating film,
23 ░ EndPage: 424. 36e06 Bm &, 25--Lid Stone piece-26 a. 26b иии Air flow through small hole,
27 иии Shielding disk, 28 ░ 37.42 иии Radiation circumference (1 round part), 29 @ 1 acoustic
damping material, 32. T, 38, 43 и и и и tone recorder transformer 141am и picture @ close tape.
Patent applicant Nippon Victor Co., Ltd. Attorney patent attorney Tadahiko Ito EndPage: 5 Fig. 7
Fig. 8) ? ?, 97411 ? EH 2 Fig. 10 Fig. 11 EndPage: ?
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