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EP2982135B1 - Ear canal earpiece comprising an ear mold unit - Google Patents

Ear canal earpiece comprising an ear mold unit Download PDF

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Publication number
EP2982135B1
EP2982135B1 EP14714708.6A EP14714708A EP2982135B1 EP 2982135 B1 EP2982135 B1 EP 2982135B1 EP 14714708 A EP14714708 A EP 14714708A EP 2982135 B1 EP2982135 B1 EP 2982135B1
Authority
EP
European Patent Office
Prior art keywords
sound
guide unit
sound guide
ear canal
ear
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP14714708.6A
Other languages
German (de)
French (fr)
Other versions
EP2982135A1 (en
Inventor
Heinz Epping
André Michaelis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sennheiser Electronic GmbH and Co KG
Original Assignee
Sennheiser Electronic GmbH and Co KG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sennheiser Electronic GmbH and Co KG filed Critical Sennheiser Electronic GmbH and Co KG
Publication of EP2982135A1 publication Critical patent/EP2982135A1/en
Application granted granted Critical
Publication of EP2982135B1 publication Critical patent/EP2982135B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/10—Earpieces; Attachments therefor ; Earphones; Monophonic headphones
    • H04R1/1016—Earpieces of the intra-aural type
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R25/00—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception
    • H04R25/65—Housing parts, e.g. shells, tips or moulds, or their manufacture
    • H04R25/652—Ear tips; Ear moulds
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/002—Devices for damping, suppressing, obstructing or conducting sound in acoustic devices
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/18—Methods or devices for transmitting, conducting or directing sound
    • G10K11/22—Methods or devices for transmitting, conducting or directing sound for conducting sound through hollow pipes, e.g. speaking tubes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R1/00—Details of transducers, loudspeakers or microphones
    • H04R1/20—Arrangements for obtaining desired frequency or directional characteristics
    • H04R1/22—Arrangements for obtaining desired frequency or directional characteristics for obtaining desired frequency characteristic only 
    • H04R1/28—Transducer mountings or enclosures modified by provision of mechanical or acoustic impedances, e.g. resonator, damping means
    • H04R1/2869—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself
    • H04R1/2873—Reduction of undesired resonances, i.e. standing waves within enclosure, or of undesired vibrations, i.e. of the enclosure itself for loudspeaker transducers
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K2210/00—Details of active noise control [ANC] covered by G10K11/178 but not provided for in any of its subgroups
    • G10K2210/30—Means
    • G10K2210/321—Physical
    • G10K2210/3227—Resonators
    • G10K2210/32272—Helmholtz resonators

Definitions

  • the invention relates to an ear canal earpiece.
  • Ear canal earphones generally have an acoustic transducer that is built into a housing that is inserted intra-aurally, that is, into the ear canal.
  • An ear cushion is often arranged around the housing, so that wearing the ear canal receiver in the ear is more comfortable for the user.
  • On the housing there is an electrical connection for a cable that carries an electrical signal to the sound transducer.
  • the receiver can be built into an otoplastic, also referred to here as an ear-adapted ear canal receiver.
  • an ear canal receiver cannot be provided with an ear pad, but rather attached to an otoplastic.
  • the earmold and the receiver are not a unit, but can be separated.
  • This otoplastic is referred to here as an ear mold.
  • the advantages of an ear-adapted solution are a secure fit of the listener in the ear canal and better depth reproduction due to better sealing of the listener.
  • ear canal earphones Most high-quality, custom-fit ear canal earphones have reusable systems consisting of magnetic drivers. Ear-adjusted ear canal earphones with dynamic drivers are usually not used here due to the poor sound quality.
  • the sound transducer is connected to the opening of the otoplastic via a bore or a hose.
  • the ear canal receiver When such an ear canal receiver is inserted into the ear canal of a user, the ear canal receiver closes the ear canal in an essentially airtight manner. The sound emitted by the sound transducer thus reaches the user's eardrum from the ear canal receiver via the ear canal.
  • the frequency response of such an arrangement results from the frequency response of the listener and the transfer functions of the sound guides and the ear canal.
  • the frequency response is therefore strongly dependent on the acoustic properties of the sound transducer, on the position of the transducer in the sound guide and on the geometry of the sound guide and the ear canal.
  • the properties of the resonances that develop between the sound transducer and the eardrum also depend on these factors.
  • the ear canal closed with the ear canal receiver exhibits a resonance behavior when excited with one of the resulting resonance frequencies.
  • the considered resonance frequency can be around 6 kHz, for example.
  • the increase in the sound level in the range of around 6 kHz caused by the resonance behavior has a disadvantageous effect on the sound quality.
  • the considered resonance frequency can be around 6 kHz, for example.
  • the increase in the sound level in the range of around 6 kHz caused by the resonance behavior has a disadvantageous effect on the sound quality.
  • US 2010/0322453 A1 shows an ear canal receiver with an electroacoustic sound transducer and a sound guide as well as an ear adapter.
  • US 2009/0214065 A1 shows an ear canal earpiece with an ear adapter unit.
  • WO 2007/089845 A2 shows an ear canal earpiece with an ear adapter unit.
  • U.S. 4,311,206 shows a handset with an ear adapter unit.
  • U.S. 2,964,596 shows an ear canal earpiece with an electroacoustic sound transducer and a sound guide as well as an ear fitting unit.
  • U.S. 4,870,688 shows an ear canal earpiece with an electroacoustic sound transducer as well as a sound guide and an ear adapter.
  • the object of the present invention is to improve the sound quality of a listener.
  • the effects of the ear canal on the sound quality should be compensated.
  • an ear canal earpiece with an electroacoustic sound transducer a first sound guide unit for guiding the sound from the electroacoustic sound transducer and an ear fitting unit which has a second sound guide unit for extending the first sound guide unit and a third sound guide unit.
  • the third sound guide unit is designed as an otoplastic and surrounds the second shell guide unit.
  • the third sound guide unit is used to guide sound further into an ear canal of a user.
  • An outer contour of the third sound guide unit is adapted to the inner contour of the user's ear canal.
  • the ear fitting unit has an essentially acoustically tight baffle in the area of the second sound guide unit.
  • the baffle extends between the second and third sound guide unit and forms an acoustic seal for an acoustically effective area of the third sound guide unit.
  • the baffle separates a front side from a rear side of the electroacoustic sound transducer.
  • the baffle is provided at an end of the third sound guide unit facing away from the ear.
  • the ear fitting unit with the second and third sound guide unit is designed to be removable from the first sound guide unit.
  • An inside diameter of the third sound guide unit is larger than an inside diameter of the second sound guide unit.
  • the third sound guide unit has a small wall thickness to increase the acoustically effective cross-sectional area and a minimum wall thickness to ensure mechanical stability. In the entire acoustically effective area of the third sound guide unit, a ratio of an acoustically effective cross-sectional area to a total cross-sectional area of the outer contour of the third sound guide unit is greater than 40% everywhere.
  • the acoustic load on the sound transducer through the sound guide and the ear canal can be minimized and the influences of the ear canal resonances on the sound quality can be compensated.
  • the baffle ends with a first and a second end of the sound guide unit or a second end of the sound guide unit protrudes beyond the baffle.
  • a ⁇ / 4 resonator is provided in the baffle.
  • a Helmholtz resonator is at least partially arranged in the baffle.
  • a volume of the Helmholtz resonator extends at least partially into the area of the side of the listener facing away from the ear and outside the baffle.
  • an ear fitting unit for a listener with a sound transducer and a first sound guide unit for guiding the sound from the electroacoustic sound transducer is provided.
  • the earmold unit has a second sound guide unit for lengthening the first sound guide unit, a third sound guide unit whose outer contour is adapted to an inner contour of an ear canal of a user and which surrounds the second sound guide unit and a baffle in the area of the second sound guide unit, the baffle being between the second and third sound guide unit extends.
  • the invention relates to an idea of providing an ear-adapted ear canal earpiece which has a broadband and interference-free frequency response.
  • an extension of the frequency response to high frequencies without disruptive breaks in the frequency response is provided.
  • Figure 1A shows a typical frequency response of an arrangement of an ear canal receiver with an ear canal and an ear canal receiver according to the prior art.
  • the frequency from 20 Hz to 20 kHz is shown logarithmically on the X-axis.
  • the Y-axis represents the amplitude of the frequency response from 80 to 130 dBV.
  • the ear canal of a user is closed by the ear canal receiver and this arrangement has a resonance frequency. This means that certain tones, that is to say the sound of certain frequencies that the listener emits, lie in the resonance range of the arrangement and can therefore be perceived more intensely by a user. This resonance is a property of the ear canal closed by the ear canal receiver.
  • the exact position of the resonance frequency depends on the geometry of the ear canal, on the position at which the ear canal receiver is located in the ear canal, and on the acoustic properties of the ear canal receiver. This resonance is often around 7.5 kHz. The one in the Fig. 1 The resonance increase shown in the range between 6 to 9 kHz, the maximum being around 7.5 kHz, is due to the resonance of the closed ear canal.
  • Figure 1B shows a typical frequency response of an arrangement with an ear-adapted ear canal receiver.
  • an ear canal receiver that is adapted to the ear, the listener is acoustically stressed differently and the distance to the eardrum is different from that of an ear canal receiver that is not adapted to the ear. This leads to a shift in the resonance to significantly lower frequencies such as 5 or 6 kHz. Dips are present at frequencies between 3 kHz and 10 kHz.
  • So-called ear-adapted ear canal earphones are listeners who are z. B. are precisely adapted to an ear canal of a user by means of an ear adapter or by means of an otoplastic.
  • the sound is then fed from the electroacoustic reproduction transducer through a bore (round channels, mostly made with standardized small diameters) from the transducer into the rear part of the user's ear canal. Since the ear fitting or the otoplastic is not straight, the channel between the electroacoustic sound transducer and the ear-side end of the ear fitting or the otoplastic is not a straight, but a curved bore.
  • the sound transducer With an ear canal receiver with an (attached) otoplastic, the sound transducer is acoustically stressed differently and the distance to the eardrum is different from that of an ear canal receiver that is not adapted to the ear.
  • the outer contour of the otoplastic is adapted to the inner contour of a user's ear canal.
  • the electroacoustic sound transducer of the listener is thus provided at a certain distance from the ear-side end of the otoplastic or of the earmold adapter.
  • the position here has an influence on the frequency response of the sound pressure generated on the user's eardrum.
  • the size or the outer diameter of the transducer defines the minimum distance up to which the transducer can be installed from the eardrum. Typically, the size or the outer diameter of the transducer is determined by the minimum distance from the ear canal.
  • the receiver with the ear mold or the otoplastic can only be inserted up to a certain point in the ear canal.
  • the sound generated by the electroacoustic sound transducer is guided through the bore or the channel in the ear mold or the otoplastic into the ear canal of the user.
  • Fig. 2 shows a schematic sectional view of an ear canal earpiece according to a first embodiment.
  • the earpiece 100 has an electroacoustic reproduction transducer 110, a first sound guide unit 120, a second sound guide unit 130 and a third sound guide unit 140.
  • the first sound guide unit 120 is provided in the area of a volume in front of a membrane of the electroacoustic reproduction transducer 110.
  • the third sound guide unit 140 is designed as an ear mold or as an otoplastic. Its outer contour is adapted to the inner contour of an ear canal.
  • the second sound guide unit 130 is used to extend the first sound guide unit 120.
  • the second sound guide unit can be designed to be cylindrical.
  • the length and diameter of the sound guide of the second sound guide unit 130 is designed in such a way that the acoustic mass of the first and second sound guide units 120, 130 together with the volume in front of the membrane of the reproduction transducer 110 generate a resonance frequency that expands the frequency response by the desired components.
  • the first sound guide unit 120 has a first end 121 and a second end 122.
  • the second end 122 is arranged on the side facing the ear, while the first end 121 is provided on the side facing away from the ear and can accommodate the electroacoustic reproduction transducer 110.
  • the second sound guide unit 130 has a first end 131 on the side facing away from the ear and a second end 132 on the side facing towards the ear.
  • the third sound guide unit has a first end 141 on the side facing away from the ear and a second end 142 on the side facing towards the ear.
  • the second sound guide unit 130 has a baffle 150 in order to provide a clearly delimited acoustic closure.
  • the baffle 150 is acoustically designed to be essentially tight.
  • the front of the electroacoustic transducer is acoustically separated from the rear of the transducer by the acoustically essentially tight baffle 150.
  • the baffle 150 can also be configured as part of the third sound guide unit 140 or as a separate part and can be inserted into a first end 141 of the third sound guide unit 140.
  • the baffle 150 is provided in an inner volume 143 of the third sound guide unit 140 in the area of the first end 141.
  • the baffle 150 terminates with the first and second ends 131, 132 of the second sound guide unit 130.
  • the third sound guide unit 140 has a cross section or inner diameter which is larger than the cross section or the inner diameter of the second sound guide unit 130.
  • the outer contour of the third sound guide unit 140 is essentially adapted to the inner contour of the ear canal.
  • the thickness of the third sound guide unit 140 is made as thin as possible.
  • a compromise must be chosen between the smallest possible thickness of the third sound guide unit 140 with regard to the acoustics on the one hand and a minimum wall thickness in order to provide a certain mechanical stability of the third sound guide unit 140 on the other hand.
  • the third sound guide unit 140 preferably has no constriction with regard to the geometry of the ear canal.
  • the outer contour of the third sound guide unit 140 largely follows the inner contour of the user's ear canal.
  • the ratio of the acoustically effective cross-sectional area compared to the total cross-sectional area of the outer contour is greater than 40% everywhere.
  • the second and third sound guide units 130, 140 are designed to be removable from the transducer 110 and the first sound guide unit 120.
  • Fig. 3 shows a frequency response of an arrangement of an ear canal and a receiver according to the first embodiment. Compared to the frequency response of Figure 1B a significant improvement can be seen, especially in the frequency range between 3 kHz and 10 kHz, because the breakdown in this frequency range can be avoided with a receiver according to the invention. At most there is still a resonance peak at 6 kHz.
  • Fig. 4 shows a schematic sectional view of an ear canal earpiece according to a second embodiment.
  • the ear canal receiver according to the second exemplary embodiment corresponds essentially to the ear canal receiver according to the first exemplary embodiment from FIG Fig. 2 .
  • the baffle 150 according to the first embodiment is essentially flush with the second sound guide unit 130 (ie with its first and second ends 131, 132), the baffle 150 according to the second embodiment is set back further in the direction of the first end 141 of the third sound guide unit 140 .
  • the baffle 150 can optionally be part of the third sound guide unit 140.
  • the baffle can be installed or glued in as a separate component.
  • the baffle can be produced by introducing adhesive.
  • the second sound guide unit 130 does not have to be of cylindrical design either.
  • An oval cross-section or a transition from an oval to a round cross-section or vice versa is also possible.
  • the second sound guide unit 130 can also be designed as a funnel.
  • cerumen filters In front of the openings, which have to be replaced regularly. But even if the cerumen is caught in the filter, the frequency response already changes.
  • the opening facing the ear canal is so large that on the one hand cerumen that penetrates there has practically no influence on the acoustics and on the other hand the cerumen cannot get stuck there and practically falls out again when moving.
  • FIG. 5A shows a schematic sectional view of an ear canal earpiece according to a third embodiment.
  • the ear canal receiver according to the third exemplary embodiment corresponds essentially to the ear canal receiver according to the first exemplary embodiment from FIG Fig. 2 .
  • the ear canal earpiece 100 thus has an electroacoustic reproduction transducer 110, a first, second and third sound guide unit 120, 130 and 140 and a sound wall 150 in the region of the second sound guide unit 130.
  • the receiver has a ⁇ / 4 resonator 160 in the area of the baffle 150.
  • the ⁇ / 4 resonator 160 has a first open end 161 on a side facing the ear and a closed end 162 on the side facing away from the ear.
  • the closed end 162 can optionally extend beyond the baffle 150.
  • the open end 161 can optionally extend beyond the baffle 150.
  • the length of the resonator is determined by the wavelength of the frequency to be reduced.
  • the Helmholtz resonator acts as an acoustic suction circuit and thus reduces the sound pressure in the ear canal in the area of the Helmholtz resonance.
  • Figure 5B shows the frequency response 700 of Fig. 3 as a dashed line.
  • the solid line shows the frequency response 800 smoothed in the range around 6 kHz according to the third exemplary embodiment.
  • the diameter and the shape of the cross section of the resonator 160 determine the quality of the reduction effect.
  • the cross section of the resonator 160 can be round, oval, angular, etc.
  • the cross-section does not have to be constant over the length.
  • the resonator 160 does not have to be straight, but can also be curved or shaped as desired.
  • One or more acoustic resistors can be arranged in the resonator 160.
  • acoustic suction circuits i. H. Resonators 160 are used according to the invention, which are then preferably tuned to different frequencies.
  • Fig. 6 shows a schematic sectional view of an ear canal earpiece according to a fourth embodiment.
  • the ear canal earpiece according to the fourth exemplary embodiment can be based on an ear canal earpiece according to the first or second exemplary embodiment.
  • the ear canal receiver 100 thus has an electroacoustic sound transducer 110, a first, second and third sound guide unit 120, 130, 140 and a sound wall 150 in the region of the second sound guide unit 130.
  • the receiver according to the fourth exemplary embodiment has a Helmholtz resonator 170 in the area of the baffle 150.
  • the Helmholtz resonator 170 has a first open end 171 on the side facing the ear and a volume 172 in the region of the side facing away from the ear.
  • a Helmholtz resonator consists of an element 173, which primarily forms an acoustic mass, and a closed volume 172. This is tuned in such a way that the Helmholtz resonance corresponds to the interfering resonance.
  • the Helmholtz resonator acts as an acoustic suction circuit and thus reduces the sound pressure in the ear canal in the area of the Helmholtz resonance.
  • an in Figure 5B shown improved frequency response can be achieved.
  • the baffle 150 can end flush with the second sound guide unit 130.
  • the second sound guide unit 130 can protrude beyond the sound wall in the direction of the side facing the ear, as has been described, for example, in accordance with the second exemplary embodiment.
  • the design of the ear mold or the otoplastic enables the receiver to be placed further into the ear canal of a user, so that a relatively small electroacoustic sound transducer 110 can be used, which can be placed further into the ear canal can.
  • the volume 172 of the Helmholtz resonator 170 can be led out of the sound wall 150 and can, for example, be placed next to or behind the electroacoustic sound transducer 110.
  • openings can be provided in the first, second and third sound guide units, through which attenuation can be set.
  • the electroacoustic sound transducer can be designed as a dynamic or magnetic sound transducer.
  • the third sound guide unit 140 can be designed as an ear mold. Furthermore, the sound guide units can be designed as part of an otoplastic.
  • Fig. 7 shows a schematic sectional view of an ear canal earpiece according to a fifth embodiment.
  • the handset according to the fifth embodiment can be based on a handset according to the first, second, third or fourth embodiment.
  • the receiver is realized as an ear-adapted ear canal receiver, ie the receiver can be built into an otoplastic.
  • Fig. 8 shows a schematic sectional view of an ear canal earpiece according to a sixth embodiment.
  • the listener according to the sixth exemplary embodiment can be based on a receiver according to the first, second, third or fourth exemplary embodiment.
  • the ear pad on the receiver has been replaced by an ear mold.
  • the ear mold can be designed as an otoplastic and pushed over the receiver.
  • connection between the receiver and the earpiece is a connection that can be released again by the user, for example by means of a latching connection.
  • damping elements can be provided in the first, second and third sound guide units in order to additionally influence the frequency response.
  • the second and third sound guide unit can be designed as part of the receiver (for example as part of the otoplastic) or as an ear mold (ear mold unit).

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • Otolaryngology (AREA)
  • Multimedia (AREA)
  • Manufacturing & Machinery (AREA)
  • General Health & Medical Sciences (AREA)
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  • Headphones And Earphones (AREA)

Description

Die Erfindung betrifft einen Ohrkanal-Hörer.The invention relates to an ear canal earpiece.

Ohrkanal-Hörer weisen im Allgemeinen einen akustischen Schallwandler auf, der in ein Gehäuse eingebaut ist, das intra-aural, also in den Ohrkanal, eingesetzt wird. Um das Gehäuse wird häufig ein Ohrpolster angeordnet, so dass das Tragen des Ohrkanal-Hörers im Ohr für den Anwender angenehmer wird. An dem Gehäuse befindet sich ein elektrischer Anschluss für ein Kabel, das ein elektrisches Signal zu dem Schallwandler führt.Ear canal earphones generally have an acoustic transducer that is built into a housing that is inserted intra-aurally, that is, into the ear canal. An ear cushion is often arranged around the housing, so that wearing the ear canal receiver in the ear is more comfortable for the user. On the housing there is an electrical connection for a cable that carries an electrical signal to the sound transducer.

Um den Tragekomfort für den Anwender zu verbessern und um eine höhere Dichtigkeit des Hörers im Ohrkanal zu erreichen, können die Hörer in eine Otoplastik eingebaut werden, hier auch als ohrangepasster Ohrkanal-Hörer bezeichnet.In order to improve the wearing comfort for the user and to achieve a higher tightness of the receiver in the ear canal, the receiver can be built into an otoplastic, also referred to here as an ear-adapted ear canal receiver.

Ferner kann ein Ohrkanal-Hörer nicht mit einem Ohrpolster versehen werden, sondern an einer Otoplastik befestigt werden. In diesem Fall sind Otoplastik und Hörer keine Einheit, sondern können getrennt werden. Diese Otoplastik wird hier als Ohrpassstück bezeichnet.Furthermore, an ear canal receiver cannot be provided with an ear pad, but rather attached to an otoplastic. In this case, the earmold and the receiver are not a unit, but can be separated. This otoplastic is referred to here as an ear mold.

Die Vorteile einer ohrangepassten Lösung sind ein sicherer Sitz des Hörers im Ohrkanal und eine bessere Tiefenwiedergabe durch eine bessere Abdichtung des Hörers.The advantages of an ear-adapted solution are a secure fit of the listener in the ear canal and better depth reproduction due to better sealing of the listener.

Die meisten hochwertigen ohrangepassten Ohrkanal-Hörer weisen Mehrwegsysteme bestehend aus magnetischen Treibern auf. Ohrangepasste Ohrkanal-Hörer mit dynamischen Treibern werden aufgrund der geringeren Klangqualität hier meist nicht verwendet. Der Schallwandler wird über eine Bohrung oder einen Schlauch mit der Öffnung der Otoplastik verbunden.Most high-quality, custom-fit ear canal earphones have reusable systems consisting of magnetic drivers. Ear-adjusted ear canal earphones with dynamic drivers are usually not used here due to the poor sound quality. The sound transducer is connected to the opening of the otoplastic via a bore or a hose.

Wenn ein derartiger Ohrkanal-Hörer in den Ohrkanal eines Anwenders eingesetzt ist, so verschließt der Ohrkanal-Hörer den Ohrkanal im Wesentlichen luftdicht. Der von dem Schallwandler abgestrahlte Schall gelangt so von dem Ohrkanal-Hörer über den Ohrkanal zu dem Trommelfell des Anwenders.When such an ear canal receiver is inserted into the ear canal of a user, the ear canal receiver closes the ear canal in an essentially airtight manner. The sound emitted by the sound transducer thus reaches the user's eardrum from the ear canal receiver via the ear canal.

Der Frequenzgang einer solchen Anordnung ergibt sich aus dem Frequenzgang des Hörers und den Übertragungsfunktionen der Schallführungen und des Ohrkanals. Der Frequenzgang ist also stark abhängig von den akustischen Eigenschaften des Schallwandlers, von der Position des Wandlers in der Schallführung und von der Geometrie der Schallführung und des Ohrkanals. Vor allem sind auch die Eigenschaften der Resonanzen, die sich zwischen Schallwandler und Trommelfell ausbilden, von diesen Faktoren abhängig. Der mit dem Ohrkanal-Hörer verschlossene Ohrkanal weist ein Resonanzverhalten bei der Anregung mit einer der sich ergebenden Resonanzfrequenzen auf.The frequency response of such an arrangement results from the frequency response of the listener and the transfer functions of the sound guides and the ear canal. The frequency response is therefore strongly dependent on the acoustic properties of the sound transducer, on the position of the transducer in the sound guide and on the geometry of the sound guide and the ear canal. Above all, the properties of the resonances that develop between the sound transducer and the eardrum also depend on these factors. The ear canal closed with the ear canal receiver exhibits a resonance behavior when excited with one of the resulting resonance frequencies.

Die betrachtete Resonanzfrequenz kann beispielsweise in etwa bei 6 kHz liegen. Die durch das Resonanzverhalten hervorgerufene Überhöhung des Schallpegels im Bereich von etwa 6 kHz wirkt sich nachteilig auf die Klangqualität aus.The considered resonance frequency can be around 6 kHz, for example. The increase in the sound level in the range of around 6 kHz caused by the resonance behavior has a disadvantageous effect on the sound quality.

Die betrachtete Resonanzfrequenz kann beispielsweise in etwa bei 6 kHz liegen. Die durch das Resonanzverhalten hervorgerufene Überhöhung des Schallpegels im Bereich von etwa 6 kHz wirkt sich nachteilig auf die Klangqualität aus.The considered resonance frequency can be around 6 kHz, for example. The increase in the sound level in the range of around 6 kHz caused by the resonance behavior has a disadvantageous effect on the sound quality.

Als technologischer Hintergrund der Erfindung wird auf DE 10 2008 003 248 A1 und DE 10 2009 008 376 A1 verwiesen.As a technological background of the invention is on DE 10 2008 003 248 A1 and DE 10 2009 008 376 A1 referenced.

US 2010/0322453 A1 zeigt einen Ohrkanal-Hörer mit einem elektroakustischen Schallwandler und einer Schallführung sowie einem Ohranpass-Stück. US 2010/0322453 A1 shows an ear canal receiver with an electroacoustic sound transducer and a sound guide as well as an ear adapter.

US 2009/0214065 A1 zeigt einen Ohrkanal-Hörer mit einer Ohranpass-Einheit. US 2009/0214065 A1 shows an ear canal earpiece with an ear adapter unit.

WO 2007/089845 A2 zeigt einen Ohrkanal-Hörer mit einer Ohranpass-Einheit. WO 2007/089845 A2 shows an ear canal earpiece with an ear adapter unit.

US 4,311,206 zeigt einen Hörer mit einer Ohranpass-Einheit. U.S. 4,311,206 shows a handset with an ear adapter unit.

US 2,964,596 zeigt einen Ohrkanal-Hörer mit einem elektroakustischen Schallwandler und einer Schallführung sowie einer Ohranpass-Einheit. U.S. 2,964,596 shows an ear canal earpiece with an electroacoustic sound transducer and a sound guide as well as an ear fitting unit.

US 4,870,688 zeigt einen Ohrkanal-Hörer mit einem elektroakustischen Schallwandler sowie einer Schallführung und einem Ohranpass-Stück. U.S. 4,870,688 shows an ear canal earpiece with an electroacoustic sound transducer as well as a sound guide and an ear adapter.

Aufgabe der vorliegenden Erfindung ist es, die Klangqualität eines Hörers zu verbessern. Insbesondere sollen Einflüsse des Ohrkanals auf die Klangqualität kompensiert werden.The object of the present invention is to improve the sound quality of a listener. In particular, the effects of the ear canal on the sound quality should be compensated.

Diese Aufgabe wird durch einen Ohrkanal-Hörer gemäß Anspruch 1 gelöst.This object is achieved by an ear canal receiver according to claim 1.

Somit wird ein Ohrkanal-Hörer mit einem elektroakustischen Schallwandler, einer ersten Schallführungseinheit zum Führen des Schalls von dem elektroakustischen Schallwandler und einer Ohranpass-Einheit, welche eine zweite Schallführungseinheit zum Verlängern der ersten Schallführungseinheit und eine dritte Schallführungseinheit aufweist. Die dritte Schallführungseinheit ist als Otoplastik ausgestaltet und umgibt die zweite Schalführungseinheit. Die dritte Schallführungseinheit dient dazu, Schall weiter in einen Ohrkanal eines Anwenders zu leiten. Eine Außenkontur der dritten Schallführungseinheit ist an die Innenkontur des Ohrkanals des Anwenders angepasst. Ferner weist die Ohranpass-Einheit eine im Wesentlichen akustisch dichte Schallwand im Bereich der zweiten Schallführungseinheit auf. Die Schallwand erstreckt sich zwischen der zweiten und dritten Schallführungseinheit und bildet einen akustischen Abschluss für einen akustisch wirksamen Bereich der dritten Schallführungseinheit. Die Schallwand trennt eine Vorderseite von einer Rückseite des elektroakustischen Schallwandlers. Die Schallwand ist an einem ohrabgewandten Ende der dritten Schallführungseinheit vorgesehen. Die Ohranpass-Einheit ist mit der zweiten und dritten Schallführungseinheit von der ersten Schallführungseinheit abnehmbar ausgestaltet. Ein Innendurchmesser der dritten Schallführungseinheit ist größer als ein Innendurchmesser der zweiten Schallführungseinheit. Die dritte Schallführungseinheit weist eine geringe Wandstärke zur Vergrößerung der akustisch wirksamen Querschnittsfläche und eine Mindestwandstärke zur Gewährleistung einer mechanischen Stabilität auf. Im gesamten akustisch wirksamen Bereich der dritten Schallführungseinheit ist ein Verhältnis einer akustisch wirksamen Querschnittsfläche zu einer Gesamtquerschnittsfläche der Außenkontur der dritten Schallführungseinheit überall größer als 40 %.Thus, an ear canal earpiece with an electroacoustic sound transducer, a first sound guide unit for guiding the sound from the electroacoustic sound transducer and an ear fitting unit which has a second sound guide unit for extending the first sound guide unit and a third sound guide unit. The third sound guide unit is designed as an otoplastic and surrounds the second shell guide unit. The third sound guide unit is used to guide sound further into an ear canal of a user. An outer contour of the third sound guide unit is adapted to the inner contour of the user's ear canal. Furthermore, the ear fitting unit has an essentially acoustically tight baffle in the area of the second sound guide unit. The baffle extends between the second and third sound guide unit and forms an acoustic seal for an acoustically effective area of the third sound guide unit. The baffle separates a front side from a rear side of the electroacoustic sound transducer. The baffle is provided at an end of the third sound guide unit facing away from the ear. The ear fitting unit with the second and third sound guide unit is designed to be removable from the first sound guide unit. An inside diameter of the third sound guide unit is larger than an inside diameter of the second sound guide unit. The third sound guide unit has a small wall thickness to increase the acoustically effective cross-sectional area and a minimum wall thickness to ensure mechanical stability. In the entire acoustically effective area of the third sound guide unit, a ratio of an acoustically effective cross-sectional area to a total cross-sectional area of the outer contour of the third sound guide unit is greater than 40% everywhere.

Gemäß der Erfindung kann die akustische Belastung des Schallwandlers durch die Schallführung und den Ohrkanal minimiert und die Einflüsse der Ohrkanalresonanzen auf die Klangqualität kompensiert werden.According to the invention, the acoustic load on the sound transducer through the sound guide and the ear canal can be minimized and the influences of the ear canal resonances on the sound quality can be compensated.

Gemäß einem Aspekt der vorliegenden Erfindung schließt die Schallwand mit einem ersten und zweiten Ende der Schallführungseinheit ab oder ein zweites Ende der Schallführungseinheit ragt über die Schallwand hinaus.According to one aspect of the present invention, the baffle ends with a first and a second end of the sound guide unit or a second end of the sound guide unit protrudes beyond the baffle.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung ist ein λ/4 Resonator in der Schallwand vorgesehen.According to a further aspect of the present invention, a λ / 4 resonator is provided in the baffle.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung ist ein Helmholtz-Resonator zumindest teilweise in der Schallwand angeordnet.According to a further aspect of the present invention, a Helmholtz resonator is at least partially arranged in the baffle.

Gemäß einem weiteren Aspekt der vorliegenden Erfindung erstreckt sich ein Volumen des Helmholtz-Resonators zumindest teilweise in den Bereich der ohrabgewandten Seite des Hörers und außerhalb der Schallwand.According to a further aspect of the present invention, a volume of the Helmholtz resonator extends at least partially into the area of the side of the listener facing away from the ear and outside the baffle.

Gemäß einer Ausführungsform, die nicht durch die beanspruchte Erfindung abgedeckt ist, ist eine Ohrpass-Einheit für einen Hörer mit einem Schallwandler und einer ersten Schallführungseinheit zum Führen des Schalls von dem elektroakustischen Schallwandler vorgesehen. Die Ohrpass-Einheit weist eine zweite Schallführungseinheit zum Verlängern der ersten Schallführungseinheit, eine dritte Schallführungseinheit, deren Außenkontur an eine Innenkontur eines Ohrkanals eines Anwenders angepasst ist und welche die zweite Schallführungseinheit umgibt und eine Schallwand im Bereich der zweiten Schallführungseinheit auf, wobei die Schallwand sich zwischen der zweiten und dritten Schallführungseinheit erstreckt.According to one embodiment which is not covered by the claimed invention, an ear fitting unit for a listener with a sound transducer and a first sound guide unit for guiding the sound from the electroacoustic sound transducer is provided. The earmold unit has a second sound guide unit for lengthening the first sound guide unit, a third sound guide unit whose outer contour is adapted to an inner contour of an ear canal of a user and which surrounds the second sound guide unit and a baffle in the area of the second sound guide unit, the baffle being between the second and third sound guide unit extends.

Weiterbildungen der Erfindung sind in den Unteransprüchen angegeben.Further developments of the invention are given in the subclaims.

Die Erfindung betrifft einen Gedanken, einen ohrangepassten Ohrkanal-Hörer vorzusehen, welcher einen breitbandigen und störungsfreien Frequenzgang aufweist. Hierbei wird eine Erweiterung des Frequenzganges zu hohen Frequenzen ohne störende Einbrüche im Frequenzgang vorgesehen.The invention relates to an idea of providing an ear-adapted ear canal earpiece which has a broadband and interference-free frequency response. Here, an extension of the frequency response to high frequencies without disruptive breaks in the frequency response is provided.

Die Ausführungsbeispiele und Vorteile der vorliegenden Erfindung werden nachstehend unter Bezugnahme auf die beigefügten Zeichnungen näher erläutert.

Fig. 1A
zeigt einen typischen Frequenzgang einer Anordnung mit einem Ohrkanal-Hörer und einem Ohrkanal gemäß dem Stand der Technik,
Fig. 1B
zeigt einen typischen Frequenzgang mit einem ohrangepassten Ohrkanal-Hörer,
Fig. 2
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem ersten Ausführungsbeispiel,
Fig. 3
zeigt einen Frequenzgang einer Anordnung eines Ohrkanals und eines Hörers gemäß einem ersten Ausführungsbeispiel,
Fig. 4
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem zweiten Ausführungsbeispiel,
Fig. 5A
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem dritten Ausführungsbeispiel,
Fig. 5B
zeigt einen Frequenzgang eines Ohrkanal-Hörers gemäß dem dritten Ausführungsbeispiel,
Fig. 6
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem vierten Ausführungsbeispiel,
Fig. 7
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem fünften Ausführungsbeispiel, und
Fig. 8
zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem sechsten Ausführungsbeispiel.
The exemplary embodiments and advantages of the present invention are explained in more detail below with reference to the accompanying drawings.
Figure 1A
shows a typical frequency response of an arrangement with an ear canal receiver and an ear canal according to the prior art,
Figure 1B
shows a typical frequency response with an ear-fitted ear canal receiver,
Fig. 2
shows a schematic sectional view of an ear canal earpiece according to a first embodiment,
Fig. 3
shows a frequency response of an arrangement of an ear canal and a receiver according to a first embodiment,
Fig. 4
shows a schematic sectional view of an ear canal earpiece according to a second embodiment,
Figure 5A
shows a schematic sectional view of an ear canal earpiece according to a third embodiment,
Figure 5B
shows a frequency response of an ear canal receiver according to the third embodiment,
Fig. 6
shows a schematic sectional view of an ear canal earpiece according to a fourth embodiment,
Fig. 7
shows a schematic sectional view of an ear canal earpiece according to a fifth embodiment, and
Fig. 8
shows a schematic sectional view of an ear canal earpiece according to a sixth embodiment.

Fig. 1A zeigt einen typischen Frequenzgang einer Anordnung eines Ohrkanal-Hörers mit einem Ohrkanal und einem Ohrkanal-Hörer gemäß dem Stand der Technik. Auf der X-Achse ist die Frequenz von 20 Hz bis 20 kHz logarithmisch dargestellt. Die Y-Achse stellt die Amplitude des Frequenzgangs von 80 bis 130 dBV dar. Der Ohrkanal eines Anwenders ist durch den Ohrkanal-Hörer verschlossen und diese Anordnung weist eine Resonanzfrequenz auf. Das heißt, bestimmte Töne, also Schall bestimmter Frequenzen, die der Hörer abgibt, liegen im Resonanzbereich der Anordnung und können demnach von einem Anwender verstärkt wahrgenommen werden. Diese Resonanz ist eine Eigenschaft des durch den Ohrkanal-Hörer verschlossenen Ohrkanals. Die genaue Lage der Resonanzfrequenz ist abhängig von der Geometrie des Ohrkanals, von der Position, an der sich der Ohrkanal-Hörer im Ohrkanal befindet, und von den akustischen Eigenschaften des Ohrkanal-Hörers. Diese Resonanz liegt häufig bei etwa 7,5 kHz. Die in der Fig. 1 dargestellte Resonanzüberhöhung in dem Bereich zwischen 6 bis 9 kHz, wobei das Maximum bei etwa 7,5 kHz liegt, ist auf die Resonanz des verschlossenen Ohrkanals zurückzuführen. Figure 1A shows a typical frequency response of an arrangement of an ear canal receiver with an ear canal and an ear canal receiver according to the prior art. The frequency from 20 Hz to 20 kHz is shown logarithmically on the X-axis. The Y-axis represents the amplitude of the frequency response from 80 to 130 dBV. The ear canal of a user is closed by the ear canal receiver and this arrangement has a resonance frequency. This means that certain tones, that is to say the sound of certain frequencies that the listener emits, lie in the resonance range of the arrangement and can therefore be perceived more intensely by a user. This resonance is a property of the ear canal closed by the ear canal receiver. The exact position of the resonance frequency depends on the geometry of the ear canal, on the position at which the ear canal receiver is located in the ear canal, and on the acoustic properties of the ear canal receiver. This resonance is often around 7.5 kHz. The one in the Fig. 1 The resonance increase shown in the range between 6 to 9 kHz, the maximum being around 7.5 kHz, is due to the resonance of the closed ear canal.

Fig. 1B zeigt einen typischen Frequenzgang einer Anordnung mit einem ohrangepassten Ohrkanal-Hörer. Durch einen ohrangepassten Ohrkanal-Hörer wird der Hörer akustisch anders belastet und die Abstandsverhältnisse zum Trommelfell sind anders als bei einem nicht-ohrangepassten Ohrkanal-Hörer. Dies führt zu einer Verschiebung der Resonanz zu deutlich tieferen Frequenzen wie beispielsweise bei 5 oder 6 kHz. Bei Frequenzen zwischen 3 kHz und 10 kHz sind Einbrüche vorhanden. Figure 1B shows a typical frequency response of an arrangement with an ear-adapted ear canal receiver. With an ear canal receiver that is adapted to the ear, the listener is acoustically stressed differently and the distance to the eardrum is different from that of an ear canal receiver that is not adapted to the ear. This leads to a shift in the resonance to significantly lower frequencies such as 5 or 6 kHz. Dips are present at frequencies between 3 kHz and 10 kHz.

Sogenannte ohrangepasste Ohr-Kanalhörer sind Hörer, die z. B. mittels eines Ohrpassadapters oder mittels einer Otoplastik genau an einen Ohrkanal eins Anwenders angepasst sind. Der Schall wird dann von dem elektroakustischen Wiedergabewandler über eine Bohrung (runde, meist mit genormten kleinen Durchmessern erstellte Kanäle) vom Wandler in den hinteren Teil des Ohrkanals des Anwenders geführt. Da das Ohranpass-stück bzw. die Otoplastik nicht gerade ist, ist somit auch der Kanal zwischen dem elektroakustischen Schallwandler und dem ohrseitigen Ende des Ohrpassstückes oder der Otoplastik keine gerade, sondern eine gebogene Bohrung.So-called ear-adapted ear canal earphones are listeners who are z. B. are precisely adapted to an ear canal of a user by means of an ear adapter or by means of an otoplastic. The sound is then fed from the electroacoustic reproduction transducer through a bore (round channels, mostly made with standardized small diameters) from the transducer into the rear part of the user's ear canal. Since the ear fitting or the otoplastic is not straight, the channel between the electroacoustic sound transducer and the ear-side end of the ear fitting or the otoplastic is not a straight, but a curved bore.

Durch einen Ohrkanal-Hörer mit einer (aufgesetzten) Otoplastik wird der Schallwandler akustisch anders belastet und die Abstandsverhältnisse zum Trommelfell sind anders als bei einem nicht-ohrangepassten Ohrkanal-Hörer.With an ear canal receiver with an (attached) otoplastic, the sound transducer is acoustically stressed differently and the distance to the eardrum is different from that of an ear canal receiver that is not adapted to the ear.

Bei einer Otoplastik ist die äußere Kontur der Otoplastik an die Innenkontur eines Ohrkanals eines Anwenders angepasst. Somit wird der elektroakustische Schallwandler des Hörers in einem bestimmten Abstand zu dem ohrseitigen Ende der Otoplastik bzw. des Ohrpassadapters vorgesehen. Hierbei hat die Position einen Einfluss auf den Frequenzgang des Schalldruckes, welcher an dem Trommelfell des Anwenders erzeugt wird. Durch die Größe bzw. den Außendurchmesser des Wandlers ist festgelegt, bis zu welchem minimalen Abstand zum Trommelfell der Wandler eingebaut werden kann. Typischerweise ist die Größe bzw. der Außendurchmesser des Wandlers durch den minimalen Abstand zum Ohrkanal festgelegt. Dies ist der Fall, da der Hörer mit dem Ohrpassstück oder der Otoplastik nur bis zu einem bestimmten Punkt in dem Ohrkanal eingeführt werden kann. Der durch den elektroakustischen Schallwandler erzeugte Schall wird durch die Bohrung bzw. den Kanal in dem Ohrpassstück bzw. der Otoplastik in den Ohrkanal des Anwenders geführt.In the case of an otoplastic, the outer contour of the otoplastic is adapted to the inner contour of a user's ear canal. The electroacoustic sound transducer of the listener is thus provided at a certain distance from the ear-side end of the otoplastic or of the earmold adapter. The position here has an influence on the frequency response of the sound pressure generated on the user's eardrum. The size or the outer diameter of the transducer defines the minimum distance up to which the transducer can be installed from the eardrum. Typically, the size or the outer diameter of the transducer is determined by the minimum distance from the ear canal. This is the case because the receiver with the ear mold or the otoplastic can only be inserted up to a certain point in the ear canal. The sound generated by the electroacoustic sound transducer is guided through the bore or the channel in the ear mold or the otoplastic into the ear canal of the user.

Fig. 2 zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem ersten Ausführungsbeispiel. Der Hörer 100 weist einen elektroakustischen Wiedergabewandler 110, eine erste Schallführungseinheit 120, eine zweite Schallführungseinheit 130 und eine dritte Schallführungseinheit 140 auf. Die erste Schallführungseinheit 120 ist im Bereich eines Volumens vor einer Membran des elektroakustischen Wiedergabewandlers 110 vorgesehen. Die dritte Schallführungseinheit 140 ist als ein Ohrpassstück oder als eine Otoplastik ausgestaltet. Ihre Außenkontur ist an die Innenkontur eines Ohrkanals angepasst. Die zweite Schallführungseinheit 130 dient der Verlängerung der ersten Schallführungseinheit 120. Optional kann die zweite Schallführungseinheit zylindrisch ausgestaltet sein. Die Länge und der Durchmesser der Schallführung der zweiten Schallführungseinheit 130 ist derart ausgestaltet, dass die akustische Masse der ersten und zweiten Schallführungseinheit 120, 130 zusammen mit dem Volumen vor der Membran des Wiedergabewandlers 110 eine Resonanzfrequenz erzeugen, die den Frequenzgang um die erwünschten Anteile erweitert. Fig. 2 shows a schematic sectional view of an ear canal earpiece according to a first embodiment. The earpiece 100 has an electroacoustic reproduction transducer 110, a first sound guide unit 120, a second sound guide unit 130 and a third sound guide unit 140. The first sound guide unit 120 is provided in the area of a volume in front of a membrane of the electroacoustic reproduction transducer 110. The third sound guide unit 140 is designed as an ear mold or as an otoplastic. Its outer contour is adapted to the inner contour of an ear canal. The second sound guide unit 130 is used to extend the first sound guide unit 120. Optionally, the second sound guide unit can be designed to be cylindrical. The length and diameter of the sound guide of the second sound guide unit 130 is designed in such a way that the acoustic mass of the first and second sound guide units 120, 130 together with the volume in front of the membrane of the reproduction transducer 110 generate a resonance frequency that expands the frequency response by the desired components.

Die erste Schallführungseinheit 120 weist ein erstes Ende 121 und ein zweites Ende 122 auf. Das zweite Ende 122 ist an der ohrzugewandten Seite angeordnet, während das erste Ende 121 an der ohrabgewandten Seite vorgesehen ist und den elektroakustischen Wiedergabewandler 110 aufnehmen kann. Die zweite Schallführungseinheit 130 weist ein erstes Ende 131 an der ohrabgewandten Seite und ein zweites Ende 132 an der ohrzugewandten Seite auf. Die dritte Schallführungseinheit weist ein erstes Ende 141 an der ohrabgewandten Seite und ein zweites Ende 142 an der ohrzugewandten Seite auf.The first sound guide unit 120 has a first end 121 and a second end 122. The second end 122 is arranged on the side facing the ear, while the first end 121 is provided on the side facing away from the ear and can accommodate the electroacoustic reproduction transducer 110. The second sound guide unit 130 has a first end 131 on the side facing away from the ear and a second end 132 on the side facing towards the ear. The third sound guide unit has a first end 141 on the side facing away from the ear and a second end 142 on the side facing towards the ear.

Die zweite Schallführungseinheit 130 weist eine Schallwand 150 auf, um einen klar begrenzten akustischen Abschluss vorzusehen. Die Schallwand 150 ist akustisch im Wesentlichen dicht ausgestaltet. Durch die akustisch im Wesentlichen dichte Schallwand 150 wird die Vorderseite des elektroakustischen Wandlers akustisch von der Rückseite des Wandlers getrennt. Die Schallwand 150 kann auch als Teil der dritten Schallführungseinheit 140 oder als ein separates Teil ausgestaltet sein und in ein erstes Ende 141 der dritten Schallführungseinheit 140 eingeführt werden.The second sound guide unit 130 has a baffle 150 in order to provide a clearly delimited acoustic closure. The baffle 150 is acoustically designed to be essentially tight. The front of the electroacoustic transducer is acoustically separated from the rear of the transducer by the acoustically essentially tight baffle 150. The baffle 150 can also be configured as part of the third sound guide unit 140 or as a separate part and can be inserted into a first end 141 of the third sound guide unit 140.

Die Schallwand 150 ist in einem Innenvolumen 143 der dritten Schallführungseinheit 140 im Bereich des ersten Endes 141 vorgesehen.The baffle 150 is provided in an inner volume 143 of the third sound guide unit 140 in the area of the first end 141.

Optional schließt die Schallwand 150 mit dem ersten und zweiten Ende 131, 132 der zweiten Schallführungseinheit 130 ab.Optionally, the baffle 150 terminates with the first and second ends 131, 132 of the second sound guide unit 130.

Die dritte Schallführungseinheit 140 weist einen Querschnitt bzw. Innendurchmesser auf, welcher größer ist als der Querschnitt bzw. der Innendurchmesser der zweiten Schallführungseinheit 130.The third sound guide unit 140 has a cross section or inner diameter which is larger than the cross section or the inner diameter of the second sound guide unit 130.

Die Außenkontur der dritten Schallführungseinheit 140 ist im Wesentlichen an die Innenkontur des Ohrkanals angepasst. Die Dicke der dritten Schallführungseinheit 140 ist so dünn wie möglich ausgestaltet. Hierbei muss ein Kompromiss zwischen einer möglichst geringen Dicke der dritten Schallführungseinheit 140 im Hinblick auf die Akustik einerseits und eine Mindestwandstärke gewählt werden, um andererseits eine gewisse mechanische Stabilität der dritten Schallführungseinheit 140 vorzusehen.The outer contour of the third sound guide unit 140 is essentially adapted to the inner contour of the ear canal. The thickness of the third sound guide unit 140 is made as thin as possible. Here, a compromise must be chosen between the smallest possible thickness of the third sound guide unit 140 with regard to the acoustics on the one hand and a minimum wall thickness in order to provide a certain mechanical stability of the third sound guide unit 140 on the other hand.

Vorzugsweise weist die dritte Schallführungseinheit 140 keine Einschnürung im Hinblick auf die Geometrie des Ohrkanals auf.The third sound guide unit 140 preferably has no constriction with regard to the geometry of the ear canal.

Die Außenkontur der dritten Schallführungseinheit 140 folgt weitestgehend der Innenkontur des Ohrkanals des Anwenders.The outer contour of the third sound guide unit 140 largely follows the inner contour of the user's ear canal.

Gemäß einem Aspekt der Erfindung ist im gesamten Bereich der dritten Schallführungseinheit das Verhältnis der akustisch wirksamen Querschnittsfläche im Vergleich zur Gesamtquerschnittsfläche der Außenkontur überall größer als 40%.According to one aspect of the invention, in the entire area of the third sound guide unit, the ratio of the acoustically effective cross-sectional area compared to the total cross-sectional area of the outer contour is greater than 40% everywhere.

Die zweite und dritte Schallführungseinheit 130, 140 sind von dem Wandler 110 und der ersten Schallführungseinheit 120 abnehmbar ausgestaltet.The second and third sound guide units 130, 140 are designed to be removable from the transducer 110 and the first sound guide unit 120.

Fig. 3 zeigt einen Frequenzgang einer Anordnung eines Ohrkanals und eines Hörers gemäß dem ersten Ausführungsbeispiel. Im Vergleich zu dem Frequenzgang von Fig. 1B ist insbesondere im Frequenzbereich zwischen 3 kHz und 10 kHz eine wesentliche Verbesserung zu sehen, weil der Einbruch in diesem Frequenzbereich mit einem erfindungsgemäßen Hörer vermieden werden kann. Es ist allenfalls noch eine Resonanzspitze bei 6 kHz vorhanden. Fig. 3 shows a frequency response of an arrangement of an ear canal and a receiver according to the first embodiment. Compared to the frequency response of Figure 1B a significant improvement can be seen, especially in the frequency range between 3 kHz and 10 kHz, because the breakdown in this frequency range can be avoided with a receiver according to the invention. At most there is still a resonance peak at 6 kHz.

Fig. 4 zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem zweiten Ausführungsbeispiel. Der Ohrkanal-Hörer gemäß dem zweiten Ausführungsbeispiel entspricht hierbei im Wesentlichen dem Ohrkanal-Hörer gemäß dem ersten Ausführungsbeispiel von Fig. 2. Während die Schallwand 150 gemäß dem ersten Ausführungsbeispiel im Wesentlichen bündig mit der zweiten Schallführungseinheit 130 (d. h. mit ihrem ersten und zweiten Ende 131, 132) abschließt, ist die Schallwand 150 gemäß dem zweiten Ausführungsbeispiel weiter in Richtung des ersten Endes 141 der dritten Schallführungseinheit 140 zurückgesetzt. Optional kann die Schallwand 150 Teil der dritten Schallführungseinheit 140 sein. Alternativ bzw. zusätzlich dazu kann die Schallwand als ein separates Bauteil eingebaut oder eingeklebt werden. Alternativ bzw. zusätzlich dazu kann die Schallwand durch Einbringen von Klebstoff erzeugt werden. Fig. 4 shows a schematic sectional view of an ear canal earpiece according to a second embodiment. The ear canal receiver according to the second exemplary embodiment corresponds essentially to the ear canal receiver according to the first exemplary embodiment from FIG Fig. 2 . While the baffle 150 according to the first embodiment is essentially flush with the second sound guide unit 130 (ie with its first and second ends 131, 132), the baffle 150 according to the second embodiment is set back further in the direction of the first end 141 of the third sound guide unit 140 . The baffle 150 can optionally be part of the third sound guide unit 140. As an alternative or in addition to this, the baffle can be installed or glued in as a separate component. As an alternative or in addition to this, the baffle can be produced by introducing adhesive.

Gemäß dem zweiten Ausführungsbeispiel muss die zweite Schallführungseinheit 130 auch nicht zylindrisch ausgestaltet sein. Ein ovaler Querschnitt oder ein Übergang von einem ovalen auf einen runden Querschnitt oder umgekehrt ist ebenfalls möglich. Die zweite Schallführungseinheit 130 kann ebenfalls als ein Trichter ausgestaltet sein.According to the second exemplary embodiment, the second sound guide unit 130 does not have to be of cylindrical design either. An oval cross-section or a transition from an oval to a round cross-section or vice versa is also possible. The second sound guide unit 130 can also be designed as a funnel.

Beim Tragen eines Ohrkanal-Hörers kommt der Hörer unvermeidlich mit Ohrschmalz (Cerumen) in Kontakt. Ein besonderes Problem ergibt sich, wenn Cerumen in die Schallführungen gemäß dem Stand der Technik gedrückt wird: Selbst kleine Partikel beeinflussen die akustischen Eigenschaften bereits sehr stark. Die Hersteller versuchen das Problem zu reduzieren, indem vor die Öffnungen sog. Cerumenfilter eingebaut werden, die regelmäßig ausgetauscht werden müssen. Aber selbst wenn der Cerumen in dem Filter aufgefangen wird, verändert sich der Frequenzgang bereits.When wearing an ear canal receiver, the receiver inevitably comes into contact with cerumen. A particular problem arises when cerumen is pressed into the sound guides according to the prior art: Even small particles have a very strong influence on the acoustic properties. Manufacturers try to reduce the problem by installing so-called cerumen filters in front of the openings, which have to be replaced regularly. But even if the cerumen is caught in the filter, the frequency response already changes.

Bei der erfindungsgemäßen Lösung ist die Öffnung, die zum Ohrkanal weist, so groß, dass zum einen Cerumen, der dort eindringt, praktisch keinen Einfluss auf die Akustik hat und zum anderen der Cerumen sich dort nicht festsetzen kann und bei Bewegung praktisch wieder rausfällt.In the solution according to the invention, the opening facing the ear canal is so large that on the one hand cerumen that penetrates there has practically no influence on the acoustics and on the other hand the cerumen cannot get stuck there and practically falls out again when moving.

Fig. 5A zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem dritten Ausführungsbeispiel. Der Ohrkanal-Hörer gemäß dem dritten Ausführungsbeispiel entspricht im Wesentlichen dem Ohrkanal-Hörer gemäß dem ersten Ausführungsbeispiel von Fig. 2. Somit weist der Ohrkanal-Hörer 100 einen elektroakustischen Wiedergabewandler 110, eine erste, zweite und dritte Schallführungseinheit 120, 130 und 140 sowie eine Schallwand 150 im Bereich der zweiten Schallführungseinheit 130 auf. Zusätzlich weist der Hörer gemäß dem dritten Ausführungsbeispiel einen λ/4 Resonator 160 im Bereich der Schallwand 150 auf. Der λ /4 Resonator 160 weist ein erstes offenes Ende 161 an einer ohrzugewandten Seite und ein geschlossenes Ende 162 an der ohrabgewandten Seite auf. Das geschlossene Ende 162 kann sich optional über die Schallwand 150 hinaus erstrecken. Figure 5A shows a schematic sectional view of an ear canal earpiece according to a third embodiment. The ear canal receiver according to the third exemplary embodiment corresponds essentially to the ear canal receiver according to the first exemplary embodiment from FIG Fig. 2 . The ear canal earpiece 100 thus has an electroacoustic reproduction transducer 110, a first, second and third sound guide unit 120, 130 and 140 and a sound wall 150 in the region of the second sound guide unit 130. In addition, according to the third exemplary embodiment, the receiver has a λ / 4 resonator 160 in the area of the baffle 150. The λ / 4 resonator 160 has a first open end 161 on a side facing the ear and a closed end 162 on the side facing away from the ear. The closed end 162 can optionally extend beyond the baffle 150.

Das offene Ende 161 kann sich optional über die Schallwand 150 hinaus erstrecken. Die Länge des Resonators wird bestimmt durch die Wellenlänge der zu reduzierenden Frequenz.The open end 161 can optionally extend beyond the baffle 150. The length of the resonator is determined by the wavelength of the frequency to be reduced.

Der Helmholtzresonator wirkt als akustischer Saugkreis und reduziert somit den Schalldruck im Ohrkanal im Bereich der Helmholtzresonanz.The Helmholtz resonator acts as an acoustic suction circuit and thus reduces the sound pressure in the ear canal in the area of the Helmholtz resonance.

Fig. 5B zeigt den Frequenzgang 700 von Fig. 3 als gestrichelte Linie. Die durchgezogene Linie zeigt den im Bereich um 6 kHz geglätteten Frequenzgang 800 gemäß dem dritten Ausführungsbeispiel. Figure 5B shows the frequency response 700 of Fig. 3 as a dashed line. The solid line shows the frequency response 800 smoothed in the range around 6 kHz according to the third exemplary embodiment.

Der Durchmesser und die Formgebung des Querschnitts des Resonators 160 bestimmen die Güte des Reduktionseffektes. Der Querschnitt des Resonators 160 kann rund, oval, eckig etc. sein. Der Querschnitt muss nicht über die Länge konstant sein. Der Resonator 160 muss nicht gerade sein, sondern kann auch gebogen oder beliebig geformt sein. In dem Resonator 160 können ein oder mehrere akustische Widerstände angeordnet sein.The diameter and the shape of the cross section of the resonator 160 determine the quality of the reduction effect. The cross section of the resonator 160 can be round, oval, angular, etc. The cross-section does not have to be constant over the length. The resonator 160 does not have to be straight, but can also be curved or shaped as desired. One or more acoustic resistors can be arranged in the resonator 160.

In einem Hörer können auch mehrere akustische Saugkreise, d. h. Resonatoren 160, gemäß der Erfindung verwendet werden, die dann vorzugsweise auf verschiedene Frequenzen abgestimmt sind.Several acoustic suction circuits, i. H. Resonators 160 are used according to the invention, which are then preferably tuned to different frequencies.

Fig. 6 zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem vierten Ausführungsbeispiel. Der Ohrkanal-Hörer gemäß dem vierten Ausführungsbeispiel kann auf einem Ohrkanal-Hörer gemäß dem ersten oder zweiten Ausführungsbeispiel beruhen. Somit weist der Ohrkanal-Hörer 100 einen elektroakustischen Schallwandler 110, eine erste, zweite und dritte Schallführungseinheit 120, 130, 140 und eine Schallwand 150 im Bereich der zweiten Schallführungseinheit 130 auf. Zusätzlich zu dem Hörer gemäß dem ersten oder zweiten Ausführungsbeispiel weist der Hörer gemäß dem vierten Ausführungsbeispiel einen Helmholtz-Resonator 170 im Bereich der Schallwand 150 auf. Der Helmholtz-Resonator 170 weist ein erstes offenes Ende 171 an der ohrzugewandten Seite und ein Volumen 172 im Bereich der ohrabgewandten Seite auf. Fig. 6 shows a schematic sectional view of an ear canal earpiece according to a fourth embodiment. The ear canal earpiece according to the fourth exemplary embodiment can be based on an ear canal earpiece according to the first or second exemplary embodiment. The ear canal receiver 100 thus has an electroacoustic sound transducer 110, a first, second and third sound guide unit 120, 130, 140 and a sound wall 150 in the region of the second sound guide unit 130. In addition to the receiver according to the first or second exemplary embodiment, the receiver according to the fourth exemplary embodiment has a Helmholtz resonator 170 in the area of the baffle 150. The Helmholtz resonator 170 has a first open end 171 on the side facing the ear and a volume 172 in the region of the side facing away from the ear.

Ein Helmholtz-Resonator besteht aus einem Element 173, welches vorrangig eine akustische Masse bildet und aus einem abgeschlossenen Volumen 172. Dieser wird so abgestimmt, dass die Helmholtzresonanz der störenden Resonanz entspricht. Der Helmholtzresonator wirkt als akustischer Saugkreis und reduziert somit den Schalldruck im Ohrkanal im Bereich der Helmholtzresonanz.A Helmholtz resonator consists of an element 173, which primarily forms an acoustic mass, and a closed volume 172. This is tuned in such a way that the Helmholtz resonance corresponds to the interfering resonance. The Helmholtz resonator acts as an acoustic suction circuit and thus reduces the sound pressure in the ear canal in the area of the Helmholtz resonance.

Mit einem Ohrkanal-Hörer gemäß dem vierten Ausführungsbeispiel kann ebenfalls ein in Fig. 5B gezeigter verbesserter Frequenzgang erzielt werden.With an ear canal earpiece according to the fourth exemplary embodiment, an in Figure 5B shown improved frequency response can be achieved.

Gemäß dem dritten und vierten Ausführungsbeispiel kann die Schallwand 150 bündig mit der zweiten Schallführungseinheit 130 abschließen. Alternativ dazu kann die zweite Schallführungseinheit 130 über die Schallwand hinaus in Richtung der ohrzugewandten Seite hineinragen, wie es beispielsweise gemäß dem zweiten Ausführungsbeispiel beschrieben worden ist.According to the third and fourth exemplary embodiment, the baffle 150 can end flush with the second sound guide unit 130. As an alternative to this, the second sound guide unit 130 can protrude beyond the sound wall in the direction of the side facing the ear, as has been described, for example, in accordance with the second exemplary embodiment.

Gemäß der Erfindung ist es durch die Ausgestaltung des Ohrpassstückes bzw. der Otoplastik möglich, dass der Hörer weiter in den Ohrkanal eines Anwenders hinein platziert werden kann, so dass ein relativ kleiner elektroakustischer Schallwandler 110 verwendet werden kann, welcher weiter in den Ohrkanal hinein platziert werden kann.According to the invention, the design of the ear mold or the otoplastic enables the receiver to be placed further into the ear canal of a user, so that a relatively small electroacoustic sound transducer 110 can be used, which can be placed further into the ear canal can.

Gemäß dem vierten Ausführungsbeispiel kann das Volumen 172 des HelmholtzResonators 170 aus der Schallwand 150 herausgeführt und kann beispielsweise neben oder hinter dem elektroakustischen Schallwandler 110 platziert werden.According to the fourth exemplary embodiment, the volume 172 of the Helmholtz resonator 170 can be led out of the sound wall 150 and can, for example, be placed next to or behind the electroacoustic sound transducer 110.

Optional können in der ersten, zweiten und dritten Schallführungseinheit Öffnungen vorgesehen sein, durch welche eine Dämpfung eingestellt werden kann.Optionally, openings can be provided in the first, second and third sound guide units, through which attenuation can be set.

Gemäß der Erfindung kann der elektroakustische Schallwandler als ein dynamischer oder magnetischer Schallwandler ausgestaltet sein.According to the invention, the electroacoustic sound transducer can be designed as a dynamic or magnetic sound transducer.

Die dritte Schallführungseinheit 140 kann als ein Ohrpassstück ausgestaltet sein. Ferner können die Schallführungseinheiten als Teil einer Otoplastik ausgestaltet sein.The third sound guide unit 140 can be designed as an ear mold. Furthermore, the sound guide units can be designed as part of an otoplastic.

Um ein druckfreies Tragen und ein einfaches Einsetzen und Entfernen der Otoplastik aus dem Ohrkanal zu ermöglichen, wird an manchen Stellen Material entfernt und damit bewusst von der Innenkontur des Ohrkanals abgewichen.In order to enable pressure-free wearing and easy insertion and removal of the otoplastic from the ear canal, material is removed at some points and thus deliberately deviated from the inner contour of the ear canal.

Fig. 7 zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem fünften Ausführungsbeispiel. Der Hörer gemäß dem fünften Ausführungsbeispiel kann auf einem Hörer gemäß dem ersten, zweiten, dritten oder vierten Ausführungsbeispiel beruhen. Der Hörer ist als ohrangepasster Ohrkanal-Hörer realisiert, d. h. der Hörer kann in eine Otoplastik eingebaut werden. Fig. 7 shows a schematic sectional view of an ear canal earpiece according to a fifth embodiment. The handset according to the fifth embodiment can be based on a handset according to the first, second, third or fourth embodiment. The receiver is realized as an ear-adapted ear canal receiver, ie the receiver can be built into an otoplastic.

Fig. 8 zeigt eine schematische Schnittansicht eines Ohrkanal-Hörers gemäß einem sechsten Ausführungsbeispiel. Der Hörer gemäß dem sechsten Ausführungsbeispiel kann auf einem Hörer gemäß dem ersten, zweiten, dritten oder vierten Ausführungsbeispiel beruhen. Bei dem Hörer wurde das Ohrpolster durch ein Ohrpassstück ersetzt. Das Ohrpassstück kann als eine Otoplastik ausgestaltet und über den Hörer geschoben werden. Fig. 8 shows a schematic sectional view of an ear canal earpiece according to a sixth embodiment. The listener according to the sixth exemplary embodiment can be based on a receiver according to the first, second, third or fourth exemplary embodiment. The ear pad on the receiver has been replaced by an ear mold. The ear mold can be designed as an otoplastic and pushed over the receiver.

Die Verbindung zwischen dem Hörer und dem Ohrpassstück ist eine Verbindung, die vom Benutzer wieder gelöst werden kann, z.B. durch eine Rastverbindung.The connection between the receiver and the earpiece is a connection that can be released again by the user, for example by means of a latching connection.

Optional können in der ersten, zweiten und dritten Schallführungseinheit Dämpfungselemente vorgesehen sein, um den Frequenzgang zusätzlich zu beeinflussen.Optionally, damping elements can be provided in the first, second and third sound guide units in order to additionally influence the frequency response.

Gemäß der Erfindung kann die zweite und dritte Schallführungseinheit als Teil des Hörers (z. B. als Teil der Otoplastik) oder als Ohrpassstück (Ohrpass-Einheit) ausgebildet sein.According to the invention, the second and third sound guide unit can be designed as part of the receiver (for example as part of the otoplastic) or as an ear mold (ear mold unit).

Claims (5)

  1. An ear canal earpiece comprising
    an electroacoustic sound transducer (110),
    a first sound guide unit (120) for guiding the sound from the electroacoustic sound transducer (110),
    an ear mould unit which comprises:
    a second sound guide unit (130) for prolonging the first sound guide unit (120), and
    a third sound guide unit (140) which is embodied as otoplastic means and surrounds the second sound guide unit (130) and is adapted to guide sound further into the ear canal of a user,
    wherein an outside contour of the third sound guide unit is matched to an inside contour of an ear canal of a user, and
    a sound wall (150) which is acoustically of a substantially sealing nature and is arranged in the region of the second sound guide unit (130), wherein the sound wall (150) extends between the second and third sound guide units (130, 140) and provides an acoustic termination for the acoustically effective region of the third sound guide unit (140) and acoustically separates a front side from the rear side of the electroacoustic transducer (110),
    wherein the sound wall (150) is arranged at the end (141) of the third sound guide unit (140) remote from the ear,
    wherein the ear mould unit is removable together with the second and third sound guide unit (130, 140) from the first sound guide unit (120),
    wherein an inner diameter of the third sound guide unit (140) is bigger than an inner diameter of the second sound guide unit (130),
    wherein the third sound guide unit (140) comprises a reduced wall thickness for increasing the acoustically effective cross section and a minimum wall thickness for providing a certain mechanical stability,
    wherein in the entire acoustically effective region of the third sound guide unit (140), a ratio of the acoustically effective cross section to a total cross sectional area of the outside contour of the third sound guide unit (140) is everywhere greater than 40%.
  2. An ear canal earpiece as set forth in claim 1 wherein
    the sound wall (150) terminates with a first and second end (130, 132) of the second sound guide unit (130), or
    wherein a second end (132) of the second sound guide unit (130) projects beyond the sound wall (150).
  3. An ear canal earpiece as set forth in one of claims 1 through 2 wherein there is provided a λ/4 resonator (160) in the sound wall (150).
  4. An ear canal earpiece as set forth in one of claims 1 through 3 wherein
    a Helmholtz resonator (170) is arranged at least partially in the sound wall (150).
  5. An ear canal earpiece as set forth in claim 4 wherein
    a volume (172) of the Helmholtz resonator (170) extends in the region of the side remote from the ear of the earpiece outside the sound wall (150).
EP14714708.6A 2013-04-03 2014-04-02 Ear canal earpiece comprising an ear mold unit Active EP2982135B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102013205846.2A DE102013205846A1 (en) 2013-04-03 2013-04-03 Ear canal earpiece and earpiece unit for a listener
PCT/EP2014/056596 WO2014161885A1 (en) 2013-04-03 2014-04-02 Ear canal earpiece and ear mold unit for an earpiece

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EP2982135A1 EP2982135A1 (en) 2016-02-10
EP2982135B1 true EP2982135B1 (en) 2021-12-01

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EP (1) EP2982135B1 (en)
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WO (1) WO2014161885A1 (en)

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JP6400157B1 (en) * 2017-07-25 2018-10-03 Ｔｔｒ株式会社 Sealed earphone
EP3695620B1 (en) * 2017-10-11 2023-07-05 Institut für Rundfunktechnik GmbH Improved sound transducer
GB2586063B (en) * 2019-08-01 2024-06-19 Drown Ltd Modular earphone

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US20160066111A1 (en) 2016-03-03
WO2014161885A1 (en) 2014-10-09
DE102013205846A1 (en) 2014-10-09
US9628925B2 (en) 2017-04-18
EP2982135A1 (en) 2016-02-10
DE102013205846A8 (en) 2014-11-27

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