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JPS5448228

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DESCRIPTION JPS5448228
FIAIH Title of the Invention Headphones L Ear Pads and Headphones with at least one electroacoustic transducer with a diaphragm driven planarly according to the orthodynamic or L
electrostatic conversion principle A headphone characterized in that a pad (S) surrounding the
ear is directly connected to the outer periphery of the headphone. 2 special! In the headphone
according to lF n, the flat drive diaphragm is extremely lightweight.
2 Claims
3. Detailed description of the invention The invention comprises at least an ear pad and a
diaphragm driven flat, for example based on an orthodynamic or electrostatic conversion
principle. The invention relates to a headphone comprising an electro-acoustic transducer. Such
headphones exhibit good transfer characteristics, and generally have at least one acoustic
transducer associated with six ears to bring them closer to binaural transfer, but also by means
of headphones of such a configuration. Inconvenient phenomena such as localize in the head
are recognized. O In other words, the user of the headphone feels that the sound does not come
from the outside, but the sound is the user Sense that it occurs inside the head of the head
(inolaural transmission such an effect is mitigated, but the impression that it is intended to
reproduce by a loudspeaker, for example, can not be achieved with ordinary headphones The
object of the present invention is a server configured to receive an impression that an acoustic
event is introduced from the outside into the ear, eliminating undesired localization in the head
of the transmitted acoustic event. It is to provide cents a headphone of Muoraru structure.
According to the invention, to achieve this purpose, the pad surrounding the ear is directly
connected to the outer periphery of the planar drive diaphragm. The present invention is based
on the following recognition. That is, a loudspeaker reproduction that produces an ear resonance
at the time of recording and listening to an acoustic event by a microphone designed to give a
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feeling of reproduction similar to that at the time of free listening without generating an ear
resonance important for directionality and remote listening At the time of recording based on the
premise, there is a fee for interposing ear resonance in the sound transmission path between the
microphone and the tympanic membrane in reproducing the recording by headphones in any
case. This makes it possible to most simply and reliably achieve the sound 41 characteristic of
the external ear of the user of the headphone, in which case the characteristics of the individual
of the external shape of the ear and the external appearance of the auditory way are fully taken
into account. -The effects of the external ear and the external shape of the auditory process are
particularly noticeable in the range of J kHz, and it is transmitted! , 1EndPage: 2 ° reaching the
peak and valley specific to the arrival function, and depending on the direction of the sound wave
incident and the remoteness of the sound source, an unambiguous one unique difference arises.
In the frequency range the influence of the contour of the ear has no influence on the transfer
function. Furthermore, it is assumed that there is no transmission error for ordinary headphone
space listening. In conventional headphones, a sound reflecting surface is created near the outer
ear that disrupts the individual acoustic characteristics of the outer shape of the ear.
For example, a blue transducer diaphragm such as a moving coil system having a sound
reflection surface of about jcm 2 (+, j 9) thereby directing sound input closer to the ear at critical
frequencies above J kHz. This is particularly evident when generating white noise with a 3 degree
or 1 octave filter @ therefore for the headphones according to the invention, appropriately select
the transducer diaphragm volume and its inherent mass Then, the diaphragm can be neglected as
a reflector for high frequency sound waves, and in the other high frequency regions, the
boundary 2 of the coupling space between the diaphragm and the ear. It is effective to eliminate
reflections at the interface. The acoustic transducer is preferably of the orthodynamic
transformation principle. The reason is that, together with the use of extremely light diaphragms,
the entire surface of the diaphragm can be effectively driven. Further, for headphones according
to the invention, electrostatics, in particular with ferroelectric diaphragms A scheme is also
suitable, where a dynamic type of woofer can be provided to improve the bass reproduction.
Heretofore, only ortho-dynamic headphones having a sporaural structure having an ear pad used
for overlapping with the user's outer ear are known. As a result, the resonance of the outer ear is
avoided, and the resonance of only the external auditory canal is enhanced, with an increase of
about lθ dB transfer function in the range up to p1 and jkklz. However, loss of the ear resonance
in the main range of 3/4 kHz causes transmission error ◇ The sound gap in the central part of
the ear pad is originally smaller than the diaphragm plane, so the sound wave interferes in the
small chamber below the diaphragm. Was done. . A loss occurs at high frequencies. Headhoe
according to the invention. According to the I / 20 of the present invention, the size of the
surface of the diaphragm is greater than that of the human outer ear in the present invention. It
will not be formed soon. The specific mass of the diaphragm can be kept low by selecting a very
thin foil, for example a polyester foil having a thickness on the order of 3 to 10 μ, so that the
radiation resistance in the high frequency range is mechanically impedance The balance of the
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acoustic states can occur as follows. The area of the diaphragm is about 4 ucm, and its weight is
about 0.01 t 9. The mechanical radiation resistance R8 of the wedge-shaped diaphragm is R8-ρ
@ C bow · μ2h (mechanical ohm), where ρ-air density (9 / e1m) -muco X1O-3G-1 ft M1 (C1l + /
s)- J, / 1 X 104μ-Flat circle area circle equivalent to circle radius-J, 7eiL.
2τ 1-1-λ-Wavelength (em) τ,-Values for the first order Bessel function 03 can be deduced
from Fig. 7, 03 frequencies, ie 2 oo etooo and soo. Hill values 11 o, o λ, 0. The mechanical
impedance ・ · m of the ou 9 diaphragm is given by q, λ ≠ O and / 200Q, where o is given for
the above three frequencies, 0 / λ and 1.1, and Re is E / 60 and 1tttoΩ. is there. It is clear that
there is a corresponding attenuation of the diaphragm to R 8 corresponding to 0 with a
logarithmic reduction which is illustrated as a parameter in FIG. Diaphragm weight or Q, more
than 042, additionally acoustic jI! Rubbing "" EndPage: It is preferred to place a 3 'resistance and
make its thickness as thin as possible. Besides adjusting the restoring power of the diaphragm to
make the resonance occur in a low frequency range, 1 acoustic wave is not actually reflected,
especially when the acoustic radiation resistance inevitably involves the attenuation decreasing
rate. I will pass. It means that the same thing as providing diaphragm or not at all is given to the
coupling space 0 diaphragm vibrates, and when sound is sent, the sound wave will reach the ear
from the outside without the diaphragm The physical properties of the outer ear, the auricle and
the external auditory can work without error. The technical inventiveness of the present
invention can be confirmed, for example, by performing simple experiments other than listening
to music. In this case, using a statistically distributed sustained impulse as a noise test signal 0
this either tunes the radio receiver to the transmitter at VHF or higher, or the noise level of a big
city or a headwind of noise It can be easily obtained by far-off ambient noise such as sound. In
comparison of listening with wearing headphones without headphones (without electrical
connection), in the high frequency range when there is no reflection in the coupling space
excluding the conjunctive space of the auricle and the auditory way The timbre can be made not
to differ at all ヘ ッ ド ホ ン The headphones according to the present invention fully satisfy this
condition. Inherent to the diaphragm! ! If the frequency is set to a low frequency, for example, 00
Hz, the resilience of the diaphragm becomes dominant below 0 resonance frequency where only
damping resistance that is preferably caused by the radiation resistance by the diaphragm
effectively works, and above resonance frequency The mass of the diamond plume is dominant.
However, if the radial resistance of the diaphragm is high due to its high mechanical impedance,
the diaphragm and the surrounding air are correspondingly tightly coupled. The fire can't
happen at all. For this reason, for the headphone according to the present invention, if all the
boundary surfaces of the coupling space are formed as active conversion diaphragms, the inphase sound is reflected, and besides the o41 channel which is particularly suitable □. According
to one of the simplest embodiments in which it is possible to make it possible, and in this case
the phase relationship is preferably different, only one large-area diaphragm is provided in
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connection with the circumaural ear pad. In particular, 0-ortho-dynamic driving is used
preferentially, in which the listening characteristics are significantly improved, in particular for
remote listening, but it is also possible to use diaphragms driven on the basis of electrostatic
principles such as, for example, ferroelectric diaphragms. In this case, the thickness of the
diaphragm is as thin as about 3 μ, and its weight is also very light, whereby a very favorable
relationship is created. In this case, it is proved that the static attraction between the diaphragm
and the counter electrode causes the diaphragm to be tuned to a relatively high level, so that the
resistance to fisting is increased to provide the necessary damping, and the pre-reversibility is
disadvantageous. It becomes. Besides that, as mentioned above, it is necessary to use a separate
converter for low frequencies, which only requires one small tonal gap for the coupling space, so
that the coupling space Within the preferred implementation of the present invention, the plane
of the annular ear / brad is cut like a hook by means of a plane containing a plane-driven
diaphragm, or in the preferred practice of the invention The 7 'knit itself is formed into a bowl
shape. This arrangement aims at adapting the position of the diaphragm to the user's auricle
while at the same time minimizing the possibility of possible blue reflections in the flat part of
the ear pad which limits the coupling space. To further reduce the surface of the ear pad in the
coupling space, two flat driving diaphragms arranged approximately at right angles to each other
are arranged adjacent to each other, and the lower ear pad is connected to the other interface
following the hook. Achieve by doing. With a preferred number of diaphragms driven by more
than two planes, for example for purposes specifically suited to duchanneling, the diaphragms
can be arranged to correspond to the microphone arrangements provided for recording.
Similarly, da-channel or other λ or more transmissions. .
EndPage: In a preferred implementation of the headphone suitable for the 4 ° channel system, a
pad surrounding the ear is directly connected to the outer periphery of the plane-driven
diaphragm to make the weight extremely light and at least two independent of each other
Provide a drive. In the implementation of this embodiment, due to the use of a dynamic drive, the
diaphragms occupy, for example, two areas, and in each of these areas, for example, a large
number of conductor tracks are suitably provided in the form of printed circuits. The areas have
the disadvantage of being driven independently and independently. In such a case, the magnetic
device in the Q core does not have to be completely unconditional. The reason is that it is
possible to provide conductor tracks such that the path and spacing of the conductor trunks
correspond completely to the pole piece. In the case of providing an electrostatic drive device, an
electrode pair corresponding to the number of channels is provided, and in this case, each
electrode pair is symmetrically opposed to the diaphragm surface in the case of the abovedescribed embodiment. In addition to the large flat drive diaphragms driven by two independent
drive units, a further flat diaphragm WJI / c arranged diaphragm can be provided. In that case, it
is possible to electrically integrate the diaphragms that are at an angle to each other, or to
associate them with their own transmission channel. Ear resonance can be generated by
stimulation corresponding to one natural listening in the condition of individual diaphragm
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surface by feeding to dynamic drive and planar coupling. According to the present invention, an
extremely light weight diaphragm is provided which allows sound waves to pass completely
without any layer, and in fact no reflection occurs at all. The back of the diaphragm and the side
WJ that does not face the ear when using snare headphones can radiate freely in the free space
of the peripheral, so in some cases a person present in the vicinity may combine the sound waves
coming from the headphones together If you try to listen to it will be a hindrance, hence the
feeling of discomfort 01, the reason is the sound of the sound of the FRB / kn 冨 / Jkn 冨! ,
Characterized in that the intermediate and low frequency missing sound images are audible. In
order to reduce or allow the emission of disturbing sound waves to the surroundings in the
above-mentioned frequency range, they are extended to the front face of the diamond 7 term at a
slight distance from the back face, and in particular A porous so-called sound absorbing material
having absorption in the high audio frequency region is disposed, whereby intermediate) and
high frequency sound energy is incident into the porous material ft, and then converted to heat
by its internal resistance On the other hand, in the frequency region lower than that, sound
energy is hardly suppressed and the porous material is transmitted.
This arrangement does not interfere with the conditions that form the principle of the present
invention. The reason is that neither low frequency sound waves passing through the company's
porous material, nor intermediate and high frequency sound waves absorbed by the material will
reach the diaphragm and hence the connecting space to the ear. Pa is the sound pressure of the
incoming sound and Pr is the sound pressure of the reflected wave '. In order to further eliminate
the reflection according to the present invention, P! Needs to be l. A company-made sound @
throat material is provided as a sound suppression element, and sound energy is converted into
heat by its internal friction in its narrow pores or passages (heat dissipation). If a sound wave in
the frequency range of / kT1z or more still passes through the sound suppression element, it is
necessary to further suppress the sound wave so that it can hardly be heard practically. From the
point of view of the non-reflection number required by the present invention, it is not important
that (1) how much the sound wave is converted to heat and let the material pass through it in a
known 2 distribution. However, in the high frequency range it is desirable to convert as much
sound energy as possible into heat. In general, the sound output passing through the sound
suppression element should be about 6 to i + IB lower than that of the knife, 1 This value is
sufficient to achieve the effects of the present invention. Therefore, the porous material should
have the property of converting to sound tube heat in the frequency range above / kHz. On the
contrary, passing the butterfly sound wave at low frequency almost unhinderedly. EndPage: 5 °
can be generated, but the sound / one input generated around the headphone user is not
disturbed at all. However, in some cases this may be such that slight acoustic friction in this low
frequency range causes diaphragm resonance to be critically damped above about QOOHz if the
radiation resistance of the diaphragm does not exhibit sufficient attenuation. It is an advantage
when it has a size. Thus, this basically depends on the properties of the damping material and its
thickness, which thickness is defined in terms of the frequency-related sound absorption
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capacity. According to the invention, reflections inside the headphones should be eliminated.
Therefore, the porous material is arranged or assembled so that no reflective surface is formed at
all. This is particularly noteworthy if the damping material does not have the inherent stiffness
and therefore a completely sound-permeable and dimensionally stable capsule is required to
maintain the shape of the internal structure. It should be. Preferably, a single line grid structure
is used as such a capsule. This grating structure is clearly advantageous in that it can be obtained
with the required degree of reflection.
But the capsule is a porous material itself ,. Examples of such non-porous materials are, for
example, sintered materials or felts reinforced with a reinforcing impregnation. Attempts to pass
sound through the round body wall are undesirable for a number of reasons. The reason is that it
is necessary to make the volume of the space on the back of youth friction resistance extremely
large in order to keep the recovery of the dipram in such a sheath within a certain limit, and as a
result, such headphones are practically used. In this case, the thickness of the external layer is at
least 〃 to 30 cII. The invention will be described with reference to the drawings. FIG. 1 shows a
vertical Wtr view of a headphone or a Shiva-Cafu-type orthodynamic converter. According to the
invention, an annular ear pad j [-] is provided which is relatively large and wraps without contact
with the user's ear dabs when worn. A conductor in the form of a printed circuit is provided on
the diaphragm l, which extends over the entire diaphragm surface. All in one of the diaphragm /
a outer ear da. · A joint space surrounding the ear q, which extends over the body and reaches
only the edge / part of the one ear bat j, is a 0 ortho-dynamic type conversion formed only by the
inside IIs of the ear pad j and the diaphragm l The magnetic devices in the magnetic disk are of
conventional construction and consist essentially of alternately poled magnet bars 3 and 4 and
ferromagnetic substrates 6 and 7 consisting of a perforated sheet of soft magnetic material Thus,
the sound waves can pass unhindered by the magnetic device. The diaphragm l is arranged
symmetrically with respect to the magnetic device, the distance between the diaphragm l and the
pole pieces 3 and 4 being chosen to be such that the diaphragm l made of very thin composite
material T can vibrate freely. Since this makes the heat radiation from the aluminum conductor
suitable, a horizontal cross-sectional view on the Mu B line in FIG. 1 with the 0 headphone
installed that can tolerate a current load of up to 30 A / ll 11 is shown. As is evident from FIG. 2,
the ear pad j is for example shown in FIG. 3 in order to prevent 54.degree. That the reflection 1
and thus the lateral resonance occur in one high frequency range with a large circular surface
inside the ear pad. As shown in a perspective view, it is formed in a bowl shape. This is due to the
structure of the carp-shaped human being, the appearance of the ear continues its sideways near
the cheek, but the ear is somewhat separated from the back side. Because of this the diaphragm l
of the headphone according to the invention is not perpendicular to the axis of the listener's ear,
but seals the ear so as to form an obtuse angle with that axis.
To elaborate on the ear pad of FIG. 3, this can be rounded, for example, to an oval or other shape
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besides a rectangle as shown. When using a flat ear pad, the boundary wall 9 'is made of an ear
pad as shown in Fig. 1I! Can be inserted. In order to further reduce the adverse effect of the ear
pad at the boundary of the coupling space, it is necessary to make the inner wall of the ear pad
inclined for reflection flat and thin with a minimum of one for reflection. The corresponding
structure is shown in FIG. J, and it is apparent from this that the ear pad tH is not simply lowered
but it is a flat ring. It is possible to add a diaphragm to the additional portion 1 and to make the
additional portion 1 to be a part of the boundary of the coupling space. A similar arrangement is
realized in the embodiments described above by the thickened end of the hook-like ear pad. The
diaphragm in the additional part IK is also an orthodynamic transducer of the same configuration
as the diaphragm l described above. According to the invention by preventing reflections in such
a way that the walls of the coupling space, which are formed in the form of wedges, by the
diaphragms 9, 10 //// 2 of the orthodynamic converter shown diagrammatically in FIG. The
effects that can be achieved can be further enhanced. All diaphragms can be vibrated in phase, as
for example when requiring pinaural transmission from acoustic events. For example, in multichannel transmission such as q channel, a unique converter can be provided for each
transmission channel. In other words, according to the present invention, when there are
multiple transmission channels, the coupling space is limited by orthodynamically or
electrostatically driven similar diaphragms. Sound waves arriving in three-dimensional space are
directed and remote to the ear. . ° It is known that it exhibits various transfer functions for
which the monaural and the interaural are evaluated for listening, and because the device
according to the invention [and the extremely light diaphragm can eliminate all reflections in the
coupling space The output signal from the headphones is felt in a very high range and as a signal
to the ear during natural listening. The embodiment shown in FIG. 9 shows a diaphragm 31 of an
orthodynamic headphone 0 which comprises in particular-printed circuits 32 and 33 of the same
kind, the conductor tracks of these circuits being serpentine. The electrical contacts are indicated
by 341, B and Kit, n, respectively. The diaphragm 3 / & 'i should be as thin as possible, which can
be λ ˜ 3 voices depending on the possibility of making a foil.
Preferably, aluminum is used as the conductor track. If aluminum foil is used, it should be
adhered to the diaphragm so that the total thickness must be fNj voice. If conductor foil is
deposited on 0 diaphragm 31, its layer thickness is 0.1-ダ イ ヤ フ ラ ム Diaphragm 3 / Ka
material equation 4. . In order to eliminate forces, it is possible to provide very shallow grooves,
for example loμ depths. It is preferred that the mechanical impedance of the diaphragm be
negligible for acoustical radiation resistance in audio. This has limitations both in terms of
technical aspects and thermal effects due to heat conduction from the conductor tracks by metal
parts of adjacent magnetic devices. The lines of the printed circuits 32 and 33 shown in FIG. 9
merely squeeze the boundaries of several parallel conductors. In fact, the width of a conductor
track can be larger than a single conductor, eg one conductive track width can accommodate
four single conductors, and the electrical resistance exhibits about 200-600 ohm . FIG. 1θ shows
the orthodynamic device described above worn on the ear. The diaphragm 31 is composed of, for
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example, polyester foil having a thickness of about 3 μm and printed circuits 32 and 33 shown
in FIG. The magnetic device in this case also consists of a large number of magnetic bars / 9, #,
which are arranged at a slight distance from each other on both sides of the diaphragm 3 /. Such
a magnetic mechanical diaphragm 31 is also supported. 1, fixed to the frame 0 According to the
invention according to the present invention there should be no acoustic reflector inside the
boundary of the coupling space, so there is no L, so the magnet can be made as small as possible
to pass the sound unobstructed There is a need to. For this reason, it is preferable to use a
magnet alloy of rare earth and cobalt which has a coercivity on the ts KAl side with an energy
density ((BH) wax) of about / JjKJ / J as the magnet body. The volume of the individual magnets
is relatively small so that the sound can pass through the middle space with little interference.
The frame 1 is also provided with an annular ear pad n, which allows the diaphragm 3 / to be
inclined with respect to the headphone user's temple by means of the heel shape of the pad. It
forms a connecting space that surrounds the outer ear without contact. In order to select the
relative position th of the printed circuits 32 and 33 on the diaphragm 3 /, and the diaphragm
area surrounding the circuits at the time of wearing the headphones, to always be provided
before and after the auditory way B, the outer ear 2 # The resonance of the outer ear 2 da from
one transducer approaching from the front to the I and the other transducer with the rear or 1 °
EndPage: 7 et al. The transmission of sound at low frequencies below 100 HJ is only in relation
to the change in volume relative to the volume of the coupling space of the diaphragm, since the
ear resonance in the 0 high frequency range where signals of various directional characteristics
are transmitted to the ear originates from about too Hz Dependent.
For directionality and remote listening in the low frequency range, the difference in the duration
of the re-signaling to both the right and left ears is inherently critical Ω It is preferred that the Q
diaphragm be permanently charged either positively or negatively, which is also true for the
electrostatic transducer shown in FIG. The diaphragm meeting the requirements for mechanical
and acoustical properties imposed on the present invention is, for example, of about 3 to 10
microns thick of high polymer foil such as polyester or Teflon. 0 Diaphragm 3g is flat and flat. It
has spread to, for example / /! It is sufficient to be suitable for the lowest possible fundamental
resonance such as OHz. The diamond 7 can be omitted, or a butterfly or dielectric having a high
resistance can be provided, and in some cases, the respective edges thereof can be electrically
connected. The point of the present invention is the electrode J capable of partially driving the
diaphragm. , # / # And p, and disposed in pairs of electrodes at diaphragm positions arranged
between the electrodes facing each other. The electrodes are fed by means of contacts B, / に 対
し て for one converter and by contacts / 7 * / I for the other converter, in this case for example
transformers / Connect 3/1 respectively. According to the present invention, in order to improve
the listening volume by headphones to meet -11 lI more naturally before listening, as shown in
FIG. 12, the basic structure is shown, for example, the configuration of an orthodynamic
converter in FIGS. Apart from a single plane-driven diaphragm as shown as one of the elements
or as one of the components of the electrostatic transducer in FIG. Arrange at an angle to the 3
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° front diaphragm. An example of an electrostatic converter according to the invention is shown
schematically in FIG. There is nothing behind the 'electrode c, 2' '/, so the diagram of the
electrostatic transducer is not shown according to FIG. 1/1. Angle 'formed with respect to the
diaphragm 3g? An additional diaphragm provided with i- # JL is covered by a perforated 1 m 1 l
ix. The plates 2q and 3θ form the boundary of the remainder of the coupling space, and instead
of these plates it is also possible to use a transducer with a planarly driven diaphragm.
Diaphragms arranged opposite each other at an arbitrary angle can be at least partially
connected to one another, and can have different planar couplings to target various acoustic
effects, such as six in one, especially in multi-channel transmission schemes. In detail, FIG. 12 is
provided with an ear pad of 3 to 5 II lB, which is not shown for the sake of clarity of the drawing.
In any case, as the size of the ear pad corresponds to the inside of the edge shape of the shellshaped instrument made by the transducer, as mentioned above, it is either a blue reflective
plane or nothing other than the low inner plane of the ear pad. Not formed. The individual flat
diams are arranged opposite one another and their diaphragms can be driven in part to cause ear
resonance with a stimulus corresponding to natural listening by means of the noon feeding the
planar connection. The invention is characterized in that the diaphragm is permeable to high
frequency sound waves, even though the diaphragm can emit sound by electrical excitation. This
permeability lightens the mass of the diaphragm and makes its hardness very soft, so that sound
waves are generated without loss according to the molecular motion of air, and sound waves are
generated based on the driving of the diaphragm. This is very important. As mentioned above, in
the preferred implementation of the present invention, it should be possible to prevent the
interference sound from being emitted from the one heft phone to the surroundings. To achieve
this purpose, the back of the diaphragm is externally closed with sound absorbing material. In
order to explain the effect of such treatment, it is apparent from FIG. 13 that the sound
absorption characteristics actually increase by the same amount as the transmission degree d
decreases. 0 Material 1 ° EndPage: Sound absorption of 8 ° charge The characteristic is as high
as 90% at 1000 Hz, whereas the transmission is reduced to about %%. The reflection coefficient
can be measured in the range of 100 H 2 or more, and the reflection coefficient does not reach
10% or more at any frequency. As apparent from such characteristic curves, the thickness of the
soft felt, the foamed material, the sintered material and the like is made to be equivalent to that.
Assuming that the embodiment shown in FIG. 11 is an orthodynamic converter, the diaphragm 5
/ is arranged to be able to oscillate between the poles s2 and 53. According to the invention, in
fact, a non-reflecting material pole The element j ≠ of is held completely covered by the sound
transmission lattice SS. An ear pad S6 is provided in a conventional manner to close the coupling
space in contact with the ear. The diaphragm in the embodiment of the electrostatically driven
pond is shown in cross section in FIG. 13 as a port, for example a diaphragm 41 such as a
unipolar ferroelectric diaphragm and ≦ 6 between 41 ≦ 7, 41 it de, 70 It extends so that it can
vibrate. According to the invention, a material with a speed of sound (perforated) which hardly
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reflects in the coupling space. . ≦ set da. The material is covered and held by a grid of lattices j.
In this case too, a very flat earpiece 7 / is used to seal the coupling space as usual. Further, an
electrode of a conversion device whose one end is pointed is shown at 72 in a supplementary
description of this embodiment, and a conversion device similar to this is provided opposite to
the lower side of the headphone. Therefore, the headphone shown in FIG. 13 has a number of
transducers which limit the coupling space of this headphone, so that there is no acoustically
rigid plane from which to generate reflections. Even forming the ear pad 71 extremely low to
prevent reflection 0 Figures 16 and 77 also show an embodiment of the electrostatically driven
diaphragm with headphones, in this case at least one flat. The converter is simply replaced by a
curved electrode arrangement. FIG. 16 shows the whole perspective view again. On the other
hand, FIG. 77 shows the internal structure of such a headphone. In fact, behind the container 7J
which is completely sonic and does not reflect any sound at all. At degrees there are electrodes
71I and 75, between which there is a sharply stretched diaphragm 77. The element 7g that
absorbs sound of / kH2 or more is formed of a soft felt. In order to explain in detail the details of
FIG. 16, 1 flat transducers t? At the upper and lower sides of this headphone respectively to
complete the coupling space. However, in FIG. 16 the upper transducer 1r9 is visible. The
headphone shown in FIG. 16 has an ear pad 10 which is very low in order to eliminate one
reflection surface, and a connecting part! Headband attached to 2 freely! The head band must be
resiliently fitted to the headphone base 0 The principle of the headphones according to the
invention is that the ears of a wide common listener corresponding to free listening It is also
suitable for hearing measurement of hearing test to adapt to
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a cross-sectional view showing a first
embodiment of the present invention, FIG. 2 is a cross-sectional view in the same qo 0
displacement state, and FIG. 3 is a hooked ear pad in the first view. FIG. 6 is a perspective view,
FIG. 5 and FIG. . 6 is a schematic view showing the principle configuration of the present
invention, FIGS. 7 and 1 are graphs showing characteristic curves of the headphones of the
present invention, and FIG. 9 is a plan view of a diaphragm having a printed circuit, FIG. 10 is a
cross-sectional view of the headphone of the present invention using an orthodynamic converter,
11 v! J is a cross-sectional view of a transducer having a ferroelectric diaphragm, FIG. 12 is a
principle diagram of a headphone having the electrostatic device of FIG. 1A, and FIG. 73 is an
absorptivity of material of attenuation, speed of sound and reflection FIG. 74 is a cross-sectional
view of another embodiment of the present invention having an orthodynamic diaphragm, and
FIG. 1S is another characteristic example of the present invention having an electrostatic
transducer. 17 is a perspective view and a partial cutaway view of another embodiment of the
present invention having an electrostatic transducer provided with a crimped diaphragm. l · · ·
Diaphragm, λ, 3 · · · Magnet rod piece, Da · · · ear,! · · · Ear pad, 乙, 7 · · · Ferromagnetic substrate,
1 · · · Addition portion, 9 ′ · · · Boundary wall, 9a10 e / / B / 2 · · · · · · · · · · · · · Transformers S15 e
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/ 4 * / 7 g / I: contacts, 19. 〃 ··· Magnet rod, 1 ··· Frame, n ··· Ear pads, n ···················· EndPage: 9 °,
29 ··· Ear, B · · · 聴, 1 ··· electrode, 1 · · · perforated electrode , 33 ... printed circuit, 74'e3! e 36 *
77 ··· Electrical contacts, 3 g · · · Ferroelectric diaphragm, j9, Iff, # /, $ 2 · · · Electrodes, Sl · · · · · · · ·
· · · · · · · · · · · · · · · · · · · · · Non-reflective material element, ZS: blue transmission grating, St: ear pad,
≦ / 64, diaphragm: 6 II: porous material, weir! ... Protective grid, 47, 61, 4? , 70: electrode, 71:
ear pad, 72: electrode, 73: container, 71 # 7! ... electrode, 77 ... diaphragm, 71 ... sound absorbing
element, IO ... ear pad, tl ... head band, lλ ... connecting part 1, r9 ... converter. Patent assignee Ar
Kar Ge Aksitstsier Lande Kino Gerethe Gesellschaft Mituto e Bech Renchter Haftsung, z.
Attorney Sugimura Kosaku j. Fl (3,7rte, 2Fl, 4nθ5FIG, 9FIG, 102F6.11EndPage: 10
04-05-2019
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