EP3481084B1 - Hörgerät - Google Patents

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Publication number
EP3481084B1
EP3481084B1 EP18199446.8A EP18199446A EP3481084B1 EP 3481084 B1 EP3481084 B1 EP 3481084B1 EP 18199446 A EP18199446 A EP 18199446A EP 3481084 B1 EP3481084 B1 EP 3481084B1
Authority
EP
European Patent Office
Prior art keywords
sound channel
protective element
hearing aid
sound
microphone
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
EP18199446.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP3481084A1 (de
Inventor
Uwe Flaig
Hartmut Ritter
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.)
Sivantos Pte Ltd
Original Assignee
Sivantos Pte Ltd
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 Sivantos Pte Ltd filed Critical Sivantos Pte Ltd
Publication of EP3481084A1 publication Critical patent/EP3481084A1/de
Application granted granted Critical
Publication of EP3481084B1 publication Critical patent/EP3481084B1/de
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
    • H04R1/08—Mouthpieces; Microphones; Attachments therefor
    • H04R1/083—Special constructions of mouthpieces
    • H04R1/086—Protective screens, e.g. all weather or wind screens
    • 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
    • H04R25/02—Deaf-aid sets, i.e. electro-acoustic or electro-mechanical hearing aids; Electric tinnitus maskers providing an auditory perception adapted to be supported entirely by ear
    • 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
    • H04R25/40—Arrangements for obtaining a desired directivity characteristic
    • H04R25/402—Arrangements for obtaining a desired directivity characteristic using contructional means
    • 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
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles
    • H04R25/604—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles of acoustic or vibrational transducers
    • 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
    • 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
    • H04R25/654—Ear wax retarders
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2225/00—Details of deaf aids covered by H04R25/00, not provided for in any of its subgroups
    • H04R2225/021—Behind the ear [BTE] hearing aids
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04R—LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; DEAF-AID SETS; PUBLIC ADDRESS SYSTEMS
    • H04R2460/00—Details of hearing devices, i.e. of ear- or headphones covered by H04R1/10 or H04R5/033 but not provided for in any of their subgroups, or of hearing aids covered by H04R25/00 but not provided for in any of its subgroups
    • H04R2460/17—Hearing device specific tools used for storing or handling hearing devices or parts thereof, e.g. placement in the ear, replacement of cerumen barriers, repair, cleaning hearing devices
    • 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
    • H04R25/60—Mounting or interconnection of hearing aid parts, e.g. inside tips, housings or to ossicles

Definitions

  • the invention relates to a hearing aid, in particular an in-the-ear hearing aid (IDO hearing aid), with the features of the preamble of claim 1.
  • IDO hearing aid in-the-ear hearing aid
  • Hearing aids are portable hearing devices which are generally designed to output sound.
  • sound is generally understood to mean an acoustic signal, for example music and / or speech.
  • a hearing device is generally understood to mean any device that can be worn in or on the ear and produces a sound stimulus, for example a headset, headphones and the like.
  • Hearing aids are specially designed as hearing aids.
  • Hearing aid is understood to mean a device for supplying a hearing-impaired or hearing-impaired person who wears the hearing aid particularly continuously or most of the time in order to compensate for a hearing deficit,
  • hearing aids have an input converter, an amplifier and an output converter as essential components.
  • the input transducer is usually a sound receiver, e.g. B. a microphone, and / or an electromagnetic receiver, e.g. B. an induction coil.
  • the output transducer is usually an electroacoustic transducer, e.g. B. miniature speakers, or as an electromechanical converter, e.g. B. bone conduction receiver realized.
  • the amplifier is usually integrated in a signal processing unit. This basic structure is in Fig. 1 shown using the example of a behind-the-ear hearing aid.
  • One or more microphones 2 for picking up the sound from the environment are built into a hearing aid housing 1 to be worn behind the ear.
  • a signal processing unit 3 which is also integrated in the hearing aid housing 1, processes the microphone signals and strengthen it.
  • the output signal of the signal processing unit 3 is transmitted to a loudspeaker or earpiece 4, which outputs an acoustic signal. If necessary, the sound is transmitted to the eardrum of the device wearer via a sound tube that is fixed in the auditory canal with an otoplastic.
  • the power supply of the hearing device and in particular that of the signal processing unit 3 is provided by a battery 5 also integrated in the hearing device housing 1.
  • Sound to be amplified usually reaches the microphone through one or more sound openings in the hearing aid housing.
  • unwanted foreign bodies and / or liquids such as water and / or sweat, for example, can also enter the interior of the hearing aid and in particular to the microphone through such sound openings. This can result in anything from damaging the microphone to failure of the hearing aid.
  • EP 0 310 866 A1 discloses a device for closing openings on hearing aids.
  • the openings are closed, for example, by means of caps which have a sound-permeable and moisture-repellent membrane.
  • the caps are screwed onto the opening, for example.
  • a hearing aid can be seen in which a sound-permeable barrier element for sealing a microphone opening against moisture is arranged in an opening in a housing and in front of a microphone.
  • From the EP 2 334 102 A2 shows a hearing aid in which sound openings are formed laterally next to a rocker switch in the housing, which are connected to a microphone via a channel, a protective element being arranged in front of the microphone to protect it.
  • the EP 2 360 948 A2 describes a pen-shaped tool with two opposing tool tips for mounting a receiver in an earpiece. Based on this, the invention is based on the object of specifying a hearing aid in which the openings, in particular the microphone opening, are reliably protected.
  • the object is achieved by a hearing aid having the features of claim 1.
  • Advantageous configurations, developments and variants are the subject matter of the subclaims.
  • the hearing aid has a closable housing with a wall.
  • lockable is understood to mean that the housing is in particular not formed in one piece, i.e. monolithically, but has at least two (housing) parts, with the housing being able to be opened, for example, to change the battery and / or to change defective components.
  • the wall delimits an interior space in which the individual components of the hearing aid mentioned at the beginning are preferably arranged,
  • the hearing aid thus has a microphone which is arranged in the interior space and a microphone opening in the wall.
  • the hearing aid has a protective element to protect the microphone, in particular from contamination. Such impurities often get into the interior through the microphone opening.
  • contaminants specifically include foreign bodies, e.g. Hair and / or moisture, such as water and / or sweat.
  • the housing also has a sound channel with at least one sound inlet opening.
  • the sound channel leads from the outside to the microphone, so it forms a sound connection to the microphone opening.
  • the protective element is positioned in the sound channel to protect the microphone.
  • the protective element preferably fills the sound channel.
  • the protective element is designed to be especially flexible and especially elastic. In particular, it sits in a clamping manner in the sound channel.
  • the protective element therefore has a cross-sectional area which is adapted to that of the sound channel.
  • the protective element has an outer dimension, in the case of a circular configuration, that is, a diameter which is equal to or slightly larger than an inner dimension, in particular an (inner) diameter of the sound channel.
  • the protective element is also protected from direct contact, for example contaminated fingers, and from the associated contamination. For example, if a foreign body or moisture penetrates, this or this is retained and / or absorbed by the protective element and thus the microphone is protected, which extends the functionality of the hearing aid,
  • an essential advantage of the hearing aid is also reduced, since an existing “space”, that is to say the sound channel, is used to position the protective element.
  • a separate “space” for the protective element in the interior of the housing can be dispensed with, as a result of which the structural height of the housing and thus of the entire hearing aid is reduced.
  • the protective element can be replaced reversibly.
  • the protective element is not glued in or held by mechanical fastening means.
  • the protective element is preferably located directly in the sound channel without any further means and is for example - as already mentioned - clamped in the sound channel by this. In this way, on the one hand, a renewal of a soiled protective element is implemented in a simple manner.
  • the protective element can thus be manufactured as an inexpensive service part and, in particular, long-lasting and expensive materials can be dispensed with.
  • the sound channel is expediently designed as a sound channel extending through the housing.
  • continuous is specifically understood to mean that the sound channel extends through the housing from one side to the other side of the housing, for example in the manner of a bore.
  • Each end if the sound channel has a sound inlet opening, the sound channel being delimited by the wall. Sound reaches the microphone through the sound inlet openings and the sound channel.
  • the microphone is connected to the sound channel via the microphone opening.
  • the microphone opening is oriented transversely to the sound channel, so that the protective element is positioned within the sound channel “in front of” the microphone opening in the inserted state.
  • the protective element preferably has a length which corresponds to a third of the length of the sound channel.
  • the sound inlet openings are preferably arranged on opposite side walls of the housing, one of the side walls being oriented towards the head in the worn state. I.e. When worn, the sound channel is oriented essentially perpendicular to the scalp. This prevents ingress of contaminants, e.g. Hair at least reduced.
  • the sound inlet openings at each end thus ensure, on the one hand, that the protective element can be replaced easily. On the other hand, a sufficient "sound absorption" of the microphone is ensured by means of the sound inlet openings.
  • the protective element is expediently arranged in the sound channel at a distance from the two sound inlet openings, so that contact protection, for example from the user's fingers, is guaranteed.
  • the protective element is preferably arranged in a middle third of the sound channel so that the protective element in the inserted state is positioned in the sound channel, for example, by a third of the length of the sound channel away from the sound inlet openings. This furthermore prevents soiling in particular from touching the protective element, for example by the user's fingers.
  • the protective element can be passed through the sound channel for easy replacement.
  • This exchange can thus be easy and done quickly by the user, for example by pushing out the protective element at a sound inlet opening of the sound channel by inserting a new protective element through the other sound inlet opening.
  • the housing is designed as a lockable housing.
  • the protective element can be pushed into the sound channel through one of the sound inlet openings.
  • the advantage of this configuration can be seen in the user-friendliness.
  • the closed housing prevents components of the hearing aid from being damaged and / or lost when the protective element is replaced.
  • no specialist personnel for example no acoustician, is required to replace the protective element.
  • the protective element can preferably be inserted into or removed from the sound channel for exchange by means of a tool.
  • the protective element is pushed out of the sound channel, for example by means of the tool, and then a new protective element is pushed into the sound channel by means of the tool and positioned in front of the microphone opening.
  • the protective element is designed as an in particular sound permeable membrane.
  • the protective element consists of the membrane.
  • the protective element is designed as a grid.
  • the protective element has, in particular, a shape in the manner of a cuboid or, alternatively, in the manner of a cylinder. As a result, it is very well adapted to an inner contour of the sound channel.
  • the protective element preferably has the same cross-sectional area as the sound channel.
  • the protective element preferably has a slightly larger outer dimension, especially a diameter, than the inner dimension of the sound channel.
  • a slightly larger outer dimension is understood here in particular to mean that the outer dimension is 10% to 20% or, for example, a value in the range from 0.5 mm to 1.5 mm greater than the inner dimension of the sound channel.
  • the protective element is preferably self-locking due to its elastic property. In particular, no further means are provided by means of which the clamping of the protective element in the sound channel is ensured.
  • the protective element has a hydrophobic and / or oleophobic material.
  • the protective element is formed from such a material.
  • the protective element is designed to be water- and / or oil-repellent and successfully prevents moisture and / or sweat from penetrating into the housing.
  • the wall has an inner wall area and an outer wall area, between which the sound channel is formed. I.e. the sound channel is limited by the inner wall area and the outer wall area.
  • the inner wall separates the part of the interior space in which the components of the hearing aid and in particular the microphone are arranged from the sound channel.
  • the outer wall forms the "second boundary" of the sound channel.
  • the inner wall also has a hole in the manner of a bore which forms the microphone opening.
  • a sealing element is preferably arranged between the inner wall and the microphone. The sealing element is preferably used to further seal the microphone against sound from the interior.
  • the sealing element is preferably free of the protective element.
  • the sealing element and the protective element are two separate components of the hearing aid and thus an expensive and complicated sealing element, in which, for example, the protective element is integrated, can be dispensed with.
  • this further reduces the overall height of the housing, since a sealing element with an integrated protective element has a greater overall height than the present sealing element without an integrated protective element.
  • the hearing aid expediently has a tool as an accessory.
  • the tool has a handle part and at least one tool tip.
  • the handle part is used to hold the tool by the user when replacing the protective element.
  • the tool tip is used to guide the protective element when Positioning in and within the sound channel.
  • the at least one tool tip is designed in the shape of a pin and can be pushed into the sound channel, in particular for positioning the protective element.
  • pen-shaped is understood to mean that the tool tip preferably has a diameter that is 10 times smaller than the handle part.
  • the tool tip has the same diameter as the sound channel, apart from minor tolerances due to the manufacturing process. As a result, the tool, in particular the tool tip, can easily be pushed into the sound channel.
  • the tool has two tool tips each with different lengths.
  • This development is based on the idea that the protective element can be pushed out of the sound channel by means of the first - longer - tool tip and a new protective element can be pushed into the sound channel by means of the second - shorter - tool tip.
  • An essential aspect here is to be seen in the fact that the first - longer - tool tip preferably has at least a length that corresponds to two-thirds of the length of the sound channel. This ensures that the protective element is pushed out of a sound outlet opening when the user inserts the first tool tip into the other sound inlet opening.
  • the second - shorter - tool tip preferably has a maximum length that is one third of the length of the sound channel.
  • the hearing aid is designed as a behind-the-ear (BTE) hearing aid.
  • BTE behind-the-ear
  • the hearing aid 6 shown has all the components 1, 2, 3, 4, 5 necessary for functionality according to the one in FIG Fig. 1 hearing aid 6 shown.
  • the hearing aid according to Fig. 2 is designed as a behind-the-ear (BTE) hearing aid.
  • the hearing aid housing 1, called housing 1 for short has a sound channel 8 which, in the exemplary embodiment, extends through the housing 1 and has a sound inlet opening 12 at each end.
  • the sound channel 8 is delimited by an outer wall area 12 and an inner wall area 14 of the housing 1.
  • the sound channel 8 is arranged in such a way that, when the hearing aid 6 is worn, it extends through the housing 1, oriented essentially perpendicularly to the scalp 15 of the user.
  • a sound inlet opening 10 is thus arranged on the side of the housing 1. This prevents, in particular, the hair of a user from simply getting into the sound channel 8 and thus impairing the functionality of the hearing aid 6.
  • the hearing aid 6, in particular the housing 1, has an interior 16 (cf. Fig. 3 ), in which the components of the hearing aid 2, 3, 4, 5 are arranged in the exemplary embodiment and which is delimited by a wall 11.
  • the interior 16 is delimited from the sound channel 8 by the inner wall area 14.
  • a microphone 2 is arranged in the interior 16 in such a way that it passes through a microphone opening 18 (cf. Fig. 3 ) (preferably in the manner of a bore) into the inner wall area 14, with which the sound channel 8 is connected for receiving sound.
  • the microphone 2 is arranged and oriented in the interior space 16 such that sound reaches the microphone 2 through the sound channel 8 and the microphone opening 18.
  • a protective element 20 is positioned in the sound channel 8.
  • the protective element 20 serves to protect the microphone 2 from foreign bodies and contamination, such as moisture.
  • the protective element 20 is in the inserted state (cf. Fig. 3 ) positioned in the sound channel 8 in such a way that it closes the microphone opening 18 and thus prevents the ingress of foreign bodies or contaminants already mentioned.
  • the protective element 20 is designed as a membrane or, alternatively, as a grid, which has a hydrophobic and / or oleophobic material or consists of such a material.
  • a design of the protective element 20 as a grid is based on the idea that the protective element 20 thus has a strength that is "firm” enough to push the protective element 20 into and out of the sound channel 8, but “soft” enough and thus permeable is enough to let sound through to microphone 2.
  • the protective element 20 is adapted to the inner contour of the sound channel 8 and has the same cross-sectional contour in order, on the one hand, to have a high degree of accuracy of fit in the sound channel 8 and, on the other hand, to have an easy-to-manufacture shape that favors production, in particular as a service part.
  • the protective element 20 is, for example, cylindrical or else cuboid. It preferably has a length in the direction of the sound channel 8 which is greater than the microphone opening, for example by at least a factor of 2 or at least a factor of 3.
  • the longitudinal direction of the sound channel 8 and thus that of the protective element 20 is preferably oriented perpendicular to a surface normal to the microphone opening 18.
  • the protective element 20 is oriented generally transversely to the microphone opening 18.
  • the protective element 20 has the same diameter D as the sound channel 8 apart from a few tolerances, for example manufacturing-related tolerances.
  • a sealing element 22 is arranged between the inner wall area 14, specifically between the microphone opening 18 and the microphone 2.
  • the sealing element 22 serves to additionally seal the microphone opening 18 against sound from the interior 16.
  • Fig. 4 shows a tool 24 inserted into the sound channel 8, in particular a first tool tip 26 of the tool 24 inserted into the sound channel 8.
  • the tool 24 is used to replace the protective element 20 from the sound channel 8 introduced into the sound channel 8, so that it “pushes out” the protective element 20 through the opposite sound inlet opening 10 of the continuous sound channel 8.
  • the protective element 20 can then be completely removed from the sound channel 8, for example by hand, and disposed of.
  • it also has a handle part 28 in addition to the first tool tip 26.
  • the latter has at least a length that corresponds to two-thirds of the length L of the sound channel 8.
  • the tool 24 in the exemplary embodiment also has a second pin-shaped tool tip 30, as shown in FIG Fig. 5 is shown.
  • the tool tips 26, 30 are each arranged, for example, on one (end) side of the handle part 28, so that the user only has to turn the tool depending on whether a protective element 20 is to be pushed out or pushed in.
  • the user holds the protective element 20, for example, in front of one of the sound inlet openings 10 and then “pushes” it into the sound channel 8 using the second tool tip 30.
  • the configuration of the tool 24 by means of two tool tips 26, 30 has proven to be suitable, since the second tool tip 30 has, for example, a length that corresponds to a third of the length L of the sound channel 8. This ensures in a simple manner that the protective element 20 is always positioned in front of the microphone opening 18 in the inserted / pushed-in state.
  • the user pushes the protective element 20 into the sound channel 8 by means of the tool 24 until, for example, the handle part 28 rests on the housing 1.
  • Due to the advantageously selected length of the second tool tip 30, the protective element 20 is then positioned in front of the microphone opening 18 without the user being able to push the protective element 20 too far into the sound channel 8.
  • the tool 24 only has a tool tip.

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  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Signal Processing (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Neurosurgery (AREA)
  • Otolaryngology (AREA)
  • Manufacturing & Machinery (AREA)
  • Details Of Audible-Bandwidth Transducers (AREA)
  • Headphones And Earphones (AREA)
EP18199446.8A 2017-11-02 2018-10-09 Hörgerät Active EP3481084B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102017219470.7A DE102017219470A1 (de) 2017-11-02 2017-11-02 Hörgerät

Publications (2)

Publication Number Publication Date
EP3481084A1 EP3481084A1 (de) 2019-05-08
EP3481084B1 true EP3481084B1 (de) 2020-12-02

Family

ID=63832252

Family Applications (1)

Application Number Title Priority Date Filing Date
EP18199446.8A Active EP3481084B1 (de) 2017-11-02 2018-10-09 Hörgerät

Country Status (6)

Country Link
US (1) US10623873B2 (zh)
EP (1) EP3481084B1 (zh)
JP (1) JP2019088002A (zh)
CN (1) CN109756833B (zh)
DE (1) DE102017219470A1 (zh)
DK (1) DK3481084T3 (zh)

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DE102021200726A1 (de) * 2021-01-27 2022-07-28 Sivantos Pte. Ltd. Hörgerät

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US20190132690A1 (en) 2019-05-02
JP2019088002A (ja) 2019-06-06
US10623873B2 (en) 2020-04-14
DK3481084T3 (da) 2021-03-08
CN109756833A (zh) 2019-05-14
EP3481084A1 (de) 2019-05-08
DE102017219470A1 (de) 2019-05-02

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