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JPS59230395

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DESCRIPTION JPS59230395
[0001]
FIELD OF THE INVENTION The present invention relates to an annular ear pad co-belonging to a
super oral headphone unit consisting of at least two mutually connected parts, wherein one part
consists of an elastic soft elastic impermeable foam material. . The ear pad of the prior art super
oral headphone unit exists between the headphone case and the user's pinna when in use. In this
case, the ear pad of this (6) relieves the pressure exerted on the auricle from the headphones by
the ear pads of the headphone unit, thereby ensuring the comfortable wearing of the headphones
with the ear. The pressure on the pinnae is required for one to couple the headphones well
acoustically to the listener, and in the case of frequent stools, to obtain an optimal acoustical
coupling to the earpad onto the VC auricle. Require as tight a load as possible. Ear pads are often
also used to dampen any disturbing resonances that occur in the cassiling space which acts as a
Helmholtz resonator "f". Austrian Patent Specification No. 274 918, West German Patent
Publication No. 2 637, Roe 6 and "Technischen Zeitschrift 1 'i'unk schau", 26, No. 26, pp. 1159-From the description on page 1161, the customary use and expected use of the earpad for
headphone units is known. (4) In the case of the earpads counted in this prior art, the attachment
of the headphones to the ear and the associated acoustic coupling of the headphones to the
listener are rather uncertain and such With ear pads it can not be achieved in a way which
satisfies the strictly reproducible frequency characteristics from the lowest transmission
frequency to the intermediate transmission frequency 1, for example from 20H7 to 21 CH2'l :.
Furthermore, it is pointed out in DE-A 15 47 700 that the performance of headphones is limited,
especially at low frequencies. In this patent publication, the membrane resonance is shifted to the
lower end of the transmission frequency range on the − side, and the head and electroacoustic
conversion on the other side, in order to eliminate the non-constant condition when the
headphone unit is brought into contact with the auricle. It has been proposed to provide special
mechanical means to prevent the sealing of the ear canal to the air space surrounding the vessel.
01-05-2019
1
In addition, German Offenlegungsschrift DE 22 25 1 189 A1 describes the non-constant
conditions caused by the ear pads for headphones having an open back surface in order to
reproduce constant frequency characteristics constant at low frequencies in the audible range
and at intermediate stations and wave numbers. It has been described that the solution itself is
provided and that the film itself and / or the case member supporting the film is provided with a
large number of pores for controlling the non-airtightness from the front to the back of the film.
It consists of things.
By the way, not only for each special embodiment of the headphone unit, but also for all the
usual headphones such as sealed headphones, half-open headphones and open headphones. The
object of the present invention is to use the simplest possible means to couple the headphone
unit to the listener, in order to obtain a good-use roe headphone unit, for the lowest to middle
frequencies of the audible range The goal is to obtain a constant and hence exactly reproducible
condition that guarantees the uniformity of the frequency curve within the least tolerance. The
object of the invention is to provide, according to the invention, for an ear pad consisting of at
least two mutually connected parts, the other parts of this ear pad have a thin annular shape
compared to the total thickness of the annular ear pad. Formed as an acoustically transparent
layer of the material, which has a certain acoustic impedance acting mainly as a frictional
resistance against low frequencies and intermediate frequencies in the audible range and forms
an acoustic coupling. This acoustic coupling is achieved by being led in use from the coupling
space between the headphone case and the listener into the free space outside the headphone
unit. According to the present invention, the annular earpad formed in the sand-inch type has the
flexibility of the material to conform the shape and fit the earpad to the auricle, thus sealing the
concavity and convexity of the concha Thus, the present invention has the great advantage that
the elastic soft flexible foam material having the acoustic non-transmissive member is in close
contact with the pinna comfortably and acoustically. In this case, the annular layer fitted with the
ear pads is so formed that it mechanically hardly deforms or never deforms, and this from the
coupling space to the outside of the headphone and around the head of the head Get constant
acoustic conditions into the space of. Irrespective of the shape of the individual pinnae and the
locally slightly different ear contact of the headphones upon repeated wearing, the uniformly
reproducible frequency curve is completely guaranteed within the above-mentioned transmission
frequency range. The invention has the advantage that the coupling that occurs from the
coupling space to the outer space around the headphone unit limits it by the ear pads and
ventilates the ears and prevents heat buildup in the pinna when the headphones are used for a
long time Also provide. When using headphones equipped with this type of unit, the usual
annoying heat at the ear, which is usually associated with itchy stimuli, does not occur even
when the headphones are applied for a very long time, so it is comfortable to hang Is lamely
more comfortable.
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2
In the case of the first embodiment, the annular (7) flexible foam material annular acoustically
impermeable member of the ear pad consists of two pieces, between which pieces the acoustic
transmission is thin for the entire thickness of the ear pad Sex layer is arranged. With this
arrangement, a good fit of the ear pad to the shape of the head is achieved around the user's ear.
However, the annular ear pads can also be vC formed so that a thin annular layer is disposed on
the surface facing the ears of the pad. An embodiment of an ear pad according to the invention of
this kind can be obtained quite simply. This is because the pad is supported by the ear, which is
only two layers, for example a relatively thin layer, which acquires certain conditions and
contacts it, facing towards the headphone case, acoustic It is because it consists of an
impermeable and soft elastically deformable layer. The other already mentioned advantages of
the invention can also be realized in this simple implementation. In order to minimize the cost of
manufacturing the ear pad, the annular ear pad, according to another (8) feature of the present
invention, is an acoustically transparent disc in which the thin annular layer faces the ear and
contacts the pinna It is formed to be a part of The measures according to the invention for
obtaining constant acoustic conditions by means of the annular ear pads of the headphone unit
when using headphones are realized by the thin annular layer being composed of a reticulated
foam material. The reticulated foam material has a completely open cell structure which,
according to the method of manufacture, consists of a three-dimensional grid-like partition web,
between which the individual cavities are arranged. ing. A material constructed in this way is
mechanically almost rigid, for example due to the cavities in the two dividing surfaces provided
by the annular surface of the acoustically impermeable soft elastic foam material part of the ear
pad. An acoustically constant, mechanically independent layer is formed, which acts as an
acoustic impedance, which has an exclusively frictional resistance. Because of the dimensionality,
because of the low frequency and the intermediate frequency, the acoustically ineffective part of
the impedance caused by the air mass can be neglected in comparison with the frictional
resistance. It is 1. The thin layer formed from reticulated foam material, compared to the full
thickness of the ear pad, does not change mechanically and acoustically when pressing the pad
against the pinna and is constant when the pad is placed on the ear Create a condition. The
structure of this material gives rise to a fixed relationship. This is because the deformation of the
ear pad made by touching the auricle does not affect the acoustic properties of the annular gap.
In any case, the tolerance of the acoustic value, which changes only slightly outside, is so small
that the obtained conditions can actually be glossy. The 51 formations of the present invention
can also be seen in that the thin annular layer consists of sintered thermoplastic microspheres or
particles. The ear pads thus formed are most comfortable in terms of comfort, comparable to
those already described above, and most fully fulfill the inventive idea. It is the center member of
the ear pad formed in a sandwich type. The thin ring obtained by sintering the thermoplastic (11)
plastic globules or particles forms the sound-permeable layer most sufficiently, which is within
the frequency range of interest. Acts only as an acoustic impedance with frictional resistance.
The 51 good formations of the present invention are provided by the thin annular layer being
01-05-2019
3
made of metal mesh fabric having a three-dimensional lattice structure. Finally, still another
formation of the present invention is that the ear pad is coated with a thin elastic acoustically
permeable layer of fiber or plastic material at the opposite opening for the user's use. It is not
only necessary, but also particularly useful, to protect the ear pads themselves from
contaminants and to protect the headphone case in contact with the ear pads from dirt.
Furthermore, some fibers have the property of cooling when placed on the human skin and in
this case especially on the pinna, which has the property of being felt comfortable and certainly
The headphone hook with a comfortable unit makes the comfort more comfortable (12).
EXAMPLES The invention will now be described in detail with reference to the following
drawings, which also show examples. From FIG. 1 it can be determined the principle of the ear
pad 1 according to the invention, the cross-section of this ear pad showing a structure due to
sandwich pressure. The ear pad 1 is formed in an annular shape and consists of elastic soft nonpermeable foam material portions 2 between which the annular layer 3 is thin compared to the
full thickness of the ear pad 1 according to the invention Is arranged. This layer 3 is acoustically
transparent and has a constant acoustic impedance R acting mainly as a frictional resistance
against low frequencies and intermediate frequencies in the audible range. The acoustically
permeable layer 3 provides a coupling with the free space outside the unit from the coupling
space 4 between the headphone case 5 and the listener 6. The ear pad 1 is pressed against the
auricle 7 by means of the spring pressure of the headphone band 8 against the headphone case 5
and in this case the soft, elastic, acoustically impermeable foam material portion 2 of the annular
ear pad 1 Sound tight contact with 7.
The headphone case 5 is acoustically coupled to the listener 6 and the ear canal 9 via the
coupling space 4. The acoustically permeable layer 3 is hardly deformed even when the ear pad
1 is pressed against the auricle 7, as it is made of a material that is mechanically fairly robust and
stable. The mode of operation of the ear pad 10 according to the invention can also be described
from the electrical equivalent circuit diagram shown in FIG. The membrane that performs the
damped oscillation is a sound wave generating element, which is formed from an inductance
boundary, a capacitance CM and a frictional resistance RM. This film is put into motion by the
sound source K. The listener's impedance Zo is acoustically coupled to the front of the membrane
via a force acting as a capacitance, a toe ringing space. The intrinsic conversion system of the
headphones consists of an acoustic four-terminal circuit zK, which acts on the back of the
membrane together with a low-capacity chamber represented as capacitance C1 behind the
membrane Do. Depending on the type of construction of the headphone unit, that is to say that of
a closed or open type, the four-terminal circuit ZK is closed in series with a capacitance C2 or an
impedance Z1 and a radiation resistance ZST. By means of the switch S, the structural form can
be converted into another structural form. Resistance R is listener Z. The resistance is arranged in
parallel with the impedance of the sensor, and regulates the predetermined sound wave
transmissivity from the coupling space into the free space outside the headphones. The
resistance of this resistor is such that, for low audio frequencies and intermediate audio
01-05-2019
4
frequencies, the resistance together with the impedance of the listener and the reactance of the
coupling space ensure a constant relationship and for repeated use of the headphones It should
be determined to a degree that guarantees the reproducibility of the frequency characteristics. 6
to 5 show in cross-section an embodiment of an annular ear pad according to the invention. A
sound-permeable permeable annular layer 3 joins the outer space of the headphone with the
cushling space and is arranged between the elastic soft acoustically impermeable foam material
portion 2 in a sandwich form in FIG. This type of structural embodiment has several conditions
that are particularly good for certain reproducible relationships. The mechanical stability of this
acoustically permeable layer 3 is realized in that the 7 n is realized from a reticulated foam
material or a sintered metal mesh cloth consisting of sintered thermoplastic plastic globules or
particles or having a three-dimensional lattice structure. It is especially guaranteed by. A thin
acoustically impermeable part-or a coating 9 made of a plastic material protects the ear pads
from dust and dirt.
An embodiment similar to that shown in FIG. 6 is shown in FIG. A thin acoustically permeable
layer 3 is mounted on the front of the soft, elastic acoustically impermeable part 2 of the annular
earpad facing the auricle. In the case of an ear pad formed in this way, the thin annular layer 3
can only consist of reticulated foam material. That is to say that this kind of foam material
ensures a convenient and comfortable placement on the auricle without mechanically changing
the layer mechanically (15) without appreciably changing acoustically. "From there. Again, the
construction of the two different foam materials of the earpad takes into account the defined
conditions for the reproducibility of the frequency characteristics in the use of the headphones.
Also in this embodiment, the coating 9 made of a thin acoustic repermeable material protects the
ear pad from dust and dirt. It is an advantage to form the thin acoustically repellant annular layer
3 as a disc 10 as illustrated in FIG. 5 because it is simple and inexpensive to manufacture, and
the edge 10a of this disc is 1 Realize in a way that satisfies the layer according to the invention.
This embodiment claims that the disc 10 consists of a reticulated foam material as in the case of
the fourth example t) (in the case of example ii). Thin layer 10+: The annular acoustically
impermeable part 2 of the earpad, which is only a few times thicker, is made of a soft elastic
foam material as in the example of this one. This method of implementation also guarantees
certain conditions (16) which have already been described repeatedly when using the
headphones with the ear pads according to the invention as a convenience to the ear. An example
of the expected method of securing the ear pads with the headphone case or the expected
method of securing the ear pads to the headphone case is shown in FIGS. 6, 7 8 and 9. One
fastening method is provided in the form of an annular support plate 11 as represented in the
cross-sectional views of FIGS. 6, 7 and 8 which, in the vicinity of its periphery, It has a projection
12b for engaging with the headphone case. On this annular support plate 11, a soft, elastic,
sound-impermeable foam material ring is bonded with a surface 11a facing the headphone case.
In this case, as can be determined from FIG. 6, the support plate 11 can have a collar that heals at
its edge, in the first case of a good accommodation of the foam ring. However, as shown in FIG. 7,
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5
the annular recess can also be used as a guide for the sound impermeable foam ring.
In the simplest implementation, only the ring with the projections as shown in FIG. If the support
ring 11 should be abandoned due to cost savings, the ear pads are glued on the edge of this
headphone case with the surface 2a facing the headphone case 5; this fixing method is shown in
FIG. It is represented as a partial cross-sectional view. The support plate 110 circular opening 12
is approximately the same size as the opening of the annular ear / glad 2 in order to allow the
sound to reach the ear without interference from the headphones. The space contained in the
circular recess of the ear pad can be filled with reticulated foam material 13 as represented in
FIG. 10, which reticulated foam material is formed as a thicker disc.
[0002]
Brief description of the drawings
[0003]
FIG. 1 is a partial cross-sectional view showing the principle of an ear pad according to the
present invention contacting a user's ear together with a headphone case, and FIG. 2 is an
equivalent circuit diagram for explaining the present invention, FIG. FIGS. 4 and (19) are cross
sectional views showing various embodiments of the ear pad according to the present invention,
and FIGS. 6 to 9 are expected to fix the ear pad to the headphone case respectively. FIG. 10 is a
cross-sectional view showing an embodiment, and FIG. 10 is a cross-sectional view showing an
ear pad having a special filling inside.
1 · · Annular ear band, 2 · · Sound impermeable foam material member, 3, 9 · · · Sound
repermeable layer, 4 · · Coupling space, 5 · · · Headphone case · 6 · · · 7 · · · ear pin, 10 · · ·
acoustically transparent disc, 10a · · annular layer, 12 · · · · · · · · · · · · · acoustic impedance (20)
FIG, J FIG, 4 JFIG, 6 Fl 6.7 FI 6.5 Fl ( 3, 8 FIG, 10
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