US 6863151 B2
An apparatus for manufacturing ear devices that are individualized for individual. Data of the three-dimensional shape of each individual's area of application for a haring device is provided. Individual shells for the hearing devices are construed by respectively depositing commonly a layer of one of a liquid and a powderous material and solidifying by a laser arrangement in the layer individually shaped layers of the individual shells, thereby controlling the laser arrangement with the data.
1. A method for manufacturing ear devices with at least one venting passage extending essentially substantially over the length of said ear plug device between regions respectively facing the ear drum and the outer ear environment comprising the steps of:
providing data including a three-dimensional shape of said venting passage;
construing parts for said ear devices by respectively depositing commonly a layer of one of a liquid and of a powderous material and solidifying by a laser arrangement in said layer individually shaped layers of said parts, thereby controlling said laser arrangement with said data to solidify in said layers respectively a contour of a cross-section of said venting passage.
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9. A method for manufacturing ear devices comprising the steps of:
providing data of a three-dimensional shape of at least one venting passage for the hearing devices;
construing parts for said ear devices having said venting passage by providing a layer of a powderous or liquid material and solidifying at least two layers of said parts by common laser arrangement subsequently operating for solidifying one of said layers of said parts and then the other of said layers of said parts, thereby controlling said laser arrangement by said data and solidifying a contour of said venting passage in said layers.
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16. A method for manufacturing ear devices comprising the steps of:
providing data of the three-dimensional shape of at least one venting passage for the hearing devices;
depositing layers of fluidic material in a predetermined plane;
solidifying said deposited layers of fluidic material, thereby solidifying in each of said layers a cross-sectional contour of the venting passage for said device and depositing a further layer of fluidic material upon said solidified layers, thereby controlling said deposition of layers of said fluidic material by said data.
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20. A method for simultaneously manufacturing a plurality of parts of ear devices comprising:
providing data for each of said parts including data of venting passages;
simultaneously construing said parts of said devices at a respective location, the step of construing said parts including providing at each respective location a layer of solidifiable material and solidifying by a solidifying aspect that operates at each respective location a portion of the material to provide a portion of the respective part utilizing the provided data and thereby solidifying a contour of a cross-section of said venting passages.
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This application is a Continuation of U.S. patent application Ser. No. 10/373,906, filed Feb. 25, 2003, which is a Continuation of U.S. application Ser. No. 09/670,207 filed Sep. 25, 2000 now U.S. Pat. No. 6,540,045 which is a continuation in part of Ser. No. 09/607,701 filed Jun. 30, 2000 now abandoned.
The present invention relates to a method for manufacturing an ear device and to an ear device with a shell that consists of a layer of solidified thermal plastic material.
The present invention is based on the problems arising in manufacturing of in-ear hearing aids. However, the solution as found is generally applicable to ear devices as defined further below.
When manufacturing hearing aid shells today typically audiologists produce a model of the shape of the individual auditory canals, thereby taking a mold thereof, typically of silicon. This model is then sent to the hearing aid manufacturer who on the basis of this basis casts a hearing aid shell from a plastic material.
This procedure is problematic under different aspects:
Based on the mold plastic materials must be used for the shell making, which result in a shell which is relatively hard and stable with respect to its shape. This as a result leads to the fact that when inserting the finished in-ear hearing aid into an individual's ear, on account of the remaining pressure spots, the shell of the hearing aid must practically always be refinished.
Even though the above procedure allows making the resulting relatively hard shell with an outer shape matching the mold, it does not allow making complex inner and/or outer shapes such as would be desirable for configuring in an optimal manner the shape of mounts for the hearing aid's functional components. We understand under the expression “functional components” all units which are provided for reception, processing and reproduction of audio signals, that is, microphones, digital processor units, loudspeakers and accessories such as remote controls, binaural signal transmissions, batteries, etc. It must additionally be borne in mind that optimal packaging of such functional components using the space available can only be realized on an individual basis, because the geometry of the auditory canal are substantially different from individual to individual.
The above-mentioned procedure is on one hand highly labor intensive and on the other hand the resulting hearing aid will mostly be less than optimal with respect to comfort of wear and space utilization. The material used in this conventional manufacturing furthermore necessitates a relatively thick wall of the in-ear hearing aid shell, thereby further and additionally reducing the space available for implementing the functional components.
The objective of the present invention is to eliminate these drawbacks. To that end the invention is characterized in that at least one shape of the application area for the device is three-dimensionally digitized to result in a set of data and that the ear device or its shell is realized by an additive built-up process controlled by the set of data. Even though this manufacturing method is particularly appropriate for in-ear hearing aids, it also may be used with comparable advantages for outside-the-ear hearing aids, further for other ear devices, as e.g. for manufacturing earphones of all kinds, water-protection inserts, noise-protection inserts etc. In a preferred embodiment of the method according to the present invention account is taken that the area where the ear device is applied to the individual—think in particular of in-ear ear devices—undergoes a substantial dynamic in everyday life, for instance the auditory canal during chewing. By registering a single shape of the area of application of the device, so to speak as a snapshot, such dynamics cannot be taken into account for manufacturing the ear device. According to a preferred embodiment of the method according to the present invention, it registers more than one shape of the individual area of application of the device during its natural motion or at distinct positions out of that natural motion similarly to registering a movie of the dynamics of the application area, and it controls the additive built-up process in function of the data set so obtained.
The manufacturing method according to the present invention and an ear device realized thereby are exemplified below also with the help of figures. Therein:
FIGS. 7(a) to 7(f) show perspective cutaways of the surfaces of ear devices comprising venting slots manufactured with the method according to the present invention;
FIGS. 11(a) to (e) are cutaways of ear device shells fitted with venting channels of various cross-sectional shapes and dimensions and as manufactured by the method according to the present invention;
Preferably all embodiments of ear devices described subsequently to the manufacturing method are made using the method as outlined below.
We understand by the expression “ear device” a device which is applied adjacent to the outside of the external ear and/or to the external ear and/or in the auditory canal. Such devices include outside-the-ear hearing aids, in-ear hearing aids, earphones, noise-protection and water protection inserts etc. Such devices may thus be active or passive i.e. with built-in electronic devices or without it. Their outer shape is partly fitted to the area of the body, adjacent or in the ear, where they are to be applied. In German such ear devices are known as “Otoplastik”.
1. Manufacturing Process
The preferred manufacturing method for the ear devices described individually below rests on 3D digitizing the shape of an individual's particular application area for the ear device and then realizing the ear device or the shell thereof by an additive built-up process. Additive built-up processes are also known as “rapid prototyping”. A Reference to such additive built-up processes as already used in rapid prototyping may be found in:
Wohler's Report 2000, Rapid Prototyping & Tooling State of the Industry
Out of the group of presently known additive built-up processes for rapid prototyping laser sintering, laser- or stereolithography or the thermojet process are especially applicable to construe ear devices or their shells, thereby especially the embodiments thereof as described below. The specifications of these preferred additive built-up processes shall be discussed now only in brief, summarizing manner:
Laser Sintering: Hot-melt powder is deposited in a thin layer on a powder bed, e.g. using a roller. The powder layer is solidified using a laser beam which is controlled according to the shape of a sectional layer of the ear device or of the shell of such ear device, thereby making use of the 3D shape data of the individual application area. A solidified sectional layer of the ear device or of its shell is thus produced within the remaining loose powder. This layer is then lowered from the powder plane and a new powder layer is deposited on it, which is again laser-solidified according to a subsequent sectional layer of the ear device.
Laser- or Stereo-Lithography: A first sectional layer of an ear device or of its shell is solidified by a UV laser at the surface of a liquid photopolymer. The solidified layer is lowered and is covered again with liquid polymer. Using the UV laser, a second sectional layer of the ear device or of its shell is solidified on top of the already solidified layer. Again laser position control is performed by means of the 3D data or information of the previously recorded individual application area, among other data controlling the laser.
Thermojet Processing: The contour formation according to the sectional layers of the ear device or of its shell are implemented similarly to an ink jet printer by deposition of liquid according to the digitized 3D shape data, especially of the individual application area. Thereafter the deposited sectional “drawing” is solidified. Again, following the principle of additive build-up, layer after layer is deposited so as to finally build up the ear device or its shell. The following documentation is referred to regarding other additive built-up processes and regarding the above mentioned preferred ones:
“Selective Laser Sintering (SLS) of Ceramics,” Muskesh Agarwala et al., presented at the Solid Freeform Fabrication Symposium, Austin Tex., August 1999, or
Donald Klosterman et al., “Direct Fabrication of Polymer Composite Structures with Curved LOM”, Solid Freeform Fabrication Symposium, University of Texas at Austin, August 1999.
Principally the additive built-up processes always deposit a thin layer of material on a surface, be it as a full surface as is the case in laser sintering or stereo lithography, be it already as a contour of a sectional layer of the ear device or of its shell under construction. Thereupon the desired sectional shape is stabilized, i.e. solidified.
Once one layer has been solidified, a new layer is deposited on it as was described, and this new layer in turn is solidified and thereby joined to the layer underneath it, which was already finished before. In this manner the ear device or its shell is construed by additive layer by layer deposition.
For industrial manufacturing, preferably not only the sectional layer of one individual ear device or of its shell is deposited or solidified, but several of such individual devices or shells simultaneously. When laser sintering e.g. the one laser which commonly is mirror controlled, sequentially solidifies the sectional layers of several ear devices or of their shells before all these solidified sectional layers are commonly lowered. Thereupon and following up deposition of a new layer of powder across all already solidified and lowered sectional layers, the several further sectional layers are realized. In spite of this parallel manufacturing the particular ear devices or the particular shells thereof are manufactured individually and individually digitally controlled.
Thereby, a single laser beam is used to solidify the several sectional layers—and/or more than one beam are operated in parallel and are controlled in parallel. In an alternative of this procedure one laser solidifies one sectional layer while simultaneously the powder layer for the formation of another ear device or shell thereof is deposited. Thereupon the one laser solidifies the prepared powder layer according to the sectional layer for the further device while the previously solidified layer is lowered and a new powder layer is deposited thereon. Thus the laser operates intermittently—between two or more ear devices or their shells being built up, the laser down time caused by the powder deposition when forming one of the shells being exploited to solidify a sectional layer of another ear device being built up.
As shown in
The above discussed method allows implementing highly complex shapes of ear devices or of their shells, both as regards their external shape with individual matching to the application area and, as regards a shell, its inside shape. Overhangs, recesses and protrusions are easily implemented.
Moreover materials are known for additive built-up processes which can be shaped into rubbery, elastic and yet shape-stable shells which, where desired, may vary locally in wall thickness down to extremely thin walls while nevertheless being resistant to tearing.
In a presently preferred implementation, the digitizing procedure of the individual application area, in particular that of hearing aids, and even more that for in-ear hearing aids, is carried out in a specialized facility, in the latter case at the audiologist, in the form of 3D information, the individual shape is recorded there—especially in relation to hearing aids—and is transmitted to a production center, be it by transmitting a data storage medium, be it by an internet connection etc. Particularly using the above mentioned procedures, the ear device or its shell and specifically the in-ear hearing aid shell is shaped at the production center. Preferably the final assembly of the functional components is also carried out at this center.
Because, and as already mentioned, the thermoplastic materials which are used in general result in a relatively elastic, supple external shape, the shaping of ear devices or of their shells becomes much less critical with respect to pressure sites than has been experienced so far, and this feature is especially significant regarding in-ear ear devices. Illustratively, in-ear ear devices may be realized as hearing protectors, as earphones, as water-protection inserts and especially as in-ear hearing aids, which may be introduced similarly to rubbery plugs and of which the outer surface optimally applies the shape of the application area, namely of the auditory canal. One or more venting ducts or channels can easily be fitted into the in ear ear devices, so that as the ear device may be seated in a sealing manner in the auditory canal, eardrum ventilation is kept undegraded. Moreover the device's inside space can be optimized and be optimally utilized due to the individual 3D data or the application area, even individually as regards any individual apparatus configuration to be received in the device as in the case of a hearing aid.
In particular as regards ear devices in the form of hearing aids, the centralized manufacturing of their shells allows central storing and managing of individual data relating to the individual shape of the application area and also of the individual functional components and their adjustment. If for any reason a shell must be replaced, it can be readily remanufactured by retrieving the individual data sets without the heretofore necessary laborious new matching process.
Considering that the described procedures for manufacturing ear devices are known, but only for rapid prototyping and are described in the literature, they need not be discussed herein in all their technical details.
Surprisingly, however, by taking these known rapid prototyping techniques over into industrial and commercially acceptable manufacturing of ear devices, very substantial advantages are attained on grounds which per se are not significant in rapid prototyping, for instance the elasticity of the thermoplastic materials, the possibility to individually create exceedingly thin walls, etc.
In summary, the use of the cited additive built-up processes in manufacturing of ear devices or of their shells makes it possible to integrate thereat various functional elements which are laid out at the computer when designing the ear device and which are integrally produced as the ear device or its shell is built up. Conventionally such functional elements have been fitted into or joined to the finished ear device or to its shell, which may be recognized by material interfaces or by inhomogeneities in the material at link areas of such components to e.g. the shell.
As regards the cited ear devices, especially those provided with electronics such as hearing aids, and especially in-ear hearing aids, components which can be directly integrated by the proposed technique into the ear device or its shell are e.g. seats and fasteners for components, ear-wax protection systems, venting channels or grooves for in-ear ear devices, supports which position in-ear ear devices in the auditory canal as so-called claws or channel locks.
The above description is merely an illustrative example of the manner in which-known earwax protection systems and other functional elements may be integrated using the manufacturing technique as was described above.
Several specific and novel ear devices are now discussed below:
2. Vented In-ear Ear Devices
It is known to provide an external venting slot in in-ear ear devices, in particular in in-ear hearing aids, in the manner as schematically shown in FIG. 6. Such venting slots being used today are not at all optimal under several aspects:
With respect to acoustical behavior: The presently known venting slots hardly match the particular acoustical requirements. In active ear devices, for instance in-ear hearing aids, they can hardly contribute to solve the feedback problem from the electro/mechanical output transducer to the acoustical/electrical input transducer. Even as regards passive in-ear ear devices, such as hearing protection devices, they are unable to support the desired protective effect and simultaneously to maintain the desired venting properties.
Sensitivity to earwax: Presently used venting slots in the outside surfaces of in-ear ear devices are exceedingly sensitive to earwax formation. Depending on its intensity, such earwax formation may rapidly degrade the venting slots in their venting abilities, and may even clog them entirely.
For in-ear ear devices, thereby especially for in-ear hearing aids or for hearing protection devices, but also for ear devices, which only partly enter the auditory canal, such as earphones, venting systems are now presented which at least partly remedy the drawbacks of known systems.
Thereby a distinction is made between different venting systems, namely: those which are at least partly open towards the wall of the auditory canal, similarly to slots, those which are fully closed towards the wall of the auditory canal.
2a. Venting Systems Open Towards the Wall of the Auditory Canal
FIGS. 7(a) through (f) show schematic and perspective representations of cutaways of the outer wall 18 residing in the auditory canal of an in-ear ear device with novel venting-slot profiles. According to FIG. 7(a) the cross-sectional profile of the venting slot 20 a is rectangular or quadratic and constrained to predetermined, accurately maintained dimensional ratios. As shown in FIG. 7(b), the cross-sectional profile of the venting slot 20 b has the shape of the sector of a circle or of an ellipse, again constrained by accurately predetermined cross-sectional edge curve 21 b. By precisely predetermining and implementing the cross-sectional contour of the venting slots 20, some predictability and control of the acoustical transmission behavior along this slot when resting against the inner wall of the auditory canal may already be attained. Obviously the acoustic behavior also depends on the length subtended by the slot 20 along the outer wall 18 of the ear device.
In the FIGS. 7(c) through (f) further venting slots cross-sectional profiles are shown, which additionally are protected against earwax. The profile of slot 20 c according to FIG. 7(c) is in the form of a cross-sectional T.
With respect to the open cross-sectional slot bottom surface at 27 c, the inwardly projecting parts 23 c and the resulting constriction 25 c pointing towards the wall of the auditory canal already provide a substantial protection against earwax influence. Even if earwax were to penetrate the constriction 25 c and harden therein, the venting slot will not thereby be significantly constricted or even clogged, the slot then becomes a closed venting channel. The FIGS. 7(d) through 7(f) are based on the principle as shown in FIG. 7(c) and the cross-sectional shape of the open slot bottom parts 27 d through 27 f is shown in different geometries, namely being arcuate according to FIG. 7(d) or having the form of a sector of an ellipse, triangular according to FIG. 7(e) and circular or elliptical according to FIG. 7(f).
By appropriately designing the cross-sectional slot surface, which is shown in merely illustrative manner in FIGS. 7(a) through 7(f), substantial improvements may be attained relating both to acoustical properties and to protection against earwax as compared with conventional state of the art's haphazardly contoured venting slots. Thereby the profiles of the slots are now first computer modeled taking into account the protection against earwax and the acoustical effects and are integrated accurately into the ear devices as manufactured. The above discussed additive built-up processes are especially well suited for such purposes. In order to further optimize the acoustical effects of the venting slots, the most varied acoustical impedances may be implemented along the novel venting slots, which is as an example shown at the slot 29 of
Similarly to the configuration of passive electric circuits, the resultant acoustical transfer behavior of the slot abutting the auditory canal can be computer modeled and checked and then be integrated into the in-ear ear device or its shell.
One can provide sections of the device which are provided with an increased earwax protection there where such sections are especially exposed to earwax, as is shown in 20
Furthermore, it might be highly desirable, especially with an eye on optimizing the acoustical behavior, to tailor the venting slots longer than would be possible from the actual length of a particular in-ear ear device. As shown in
2b. Venting Systems with Fully Integrated Channels
This embodiment of the novel venting system is based on venting channels which at least along parts thereof are fully integrated into the ear device and which are thus closed there towards the wall of the auditory canals. This system will be elucidated below in relation to its realization in the shell of an ear device. It must be nevertheless emphasized that when no further unit needs to be integrated into an ear device and such ear device is tailored as a full material device the discussion below is also valid for channels which are provided through such full material devices.
In the embodiment of FIG. 11(e) the shell of the ear device exhibits a complex inside shape, for instance has an integrated support part 37. To optimally use the available space, the venting channel 35 e of this embodiment is designed with a cross-sectional contour which exploits the complex shape of the shell of the ear device. As a result its cross-sectional shape runs in a complex manner partly into the support strip 37 integrated in the shell 35 e.
Returning to the embodiment according to section 2a), it may be noted that such complex cross-sectional shapes optimally exploiting the available space may also be realized at venting slots which are open towards the auditory canal and as well, vice-versa, channel layout may be realized for closed venting channels as shown, for open slots, in the
In analogy to the
By the design shown in the sections 2a) and 2b), which are combinable according to respective needs, the expert is given access to a huge number of embodiment variations of novel venting systems and in particular to a large number of degrees of freedom on account of the different parameters each dimensionable per se to individually create optimal protection against earwax and optimal acoustical transfer behavior for respective individual ear devices. In all embodiments preferably the specific individual system configuration is calculated or computer modeled to meet the cited requirements. Thereupon the individual ear device is manufactured. Again the initially cited additive built-up processes, as known for rapid prototyping, are especially appropriate, controlled by the optimized modeling result.
3. Ear Devices Optimized with Respect to Shape Stability
This section discloses novel ear devices optimally matching the dynamics of the sites of use, i.e. the application area. It is e.g. known that conventional in-ear ear devices cannot meet the requirements of the comparatively large movement dynamics of the auditory canal for instance during chewing, because they exhibit substantially the same shape stability all along the device. Similarly e.g. the acoustical conductors between outside-the-ear haring aids and the auditory canal cannot freely follow the movement dynamics of the application area. The same problems, even if partly less pronounced, also arise with hearing protection devices, with earphones, water-protection inserts etc. In particular their intrinsic function, namely protection, will be partly degraded when increased account is taken of the movement dynamics of the application areas. Such is the case e.g. with known hearing protection devices made of elastically shape-changing plastics which meet well the cited dynamics of the application area, but as a tradeoff against their acoustical transfer behavior.
Depending on the required dynamics for the ear device on one hand, for instance in order to take into account the dynamics of the auditory canal and on the other hand on the requirements relating to the support and the protection of components installed, as e.g. at an in-ear hearing aid, local distribution of the wall thickness of the shell skin 45, the density and shape of ribs 47 provided will be first computed and thereupon the ear device is realized on the basis of the computed data. Again the above mentioned manufacturing processes using additive built-up are exceedingly appropriate to this purpose. Obviously too the above discussed in-ear ear device design may be combined with a venting system as elucidated in relation with the
In lieu of or complementing the desired wall reinforcement and the design of the desired flexural or torsional behavior, in short the shape behavior of in-ear ear devices, the inner rib pattern can be complemented as shown in
As shown in
The shell 55 or 45 of the
By means of the
4. Modular Housings/Installations
A problem arises in particular with in-ear hearing aids that the application area, namely the auditory canal, changes its shape. This is manifestly the case for growing humans. However, even in adults the auditory canals may also strongly change in parts, mostly with the tendency to form constrictions (e.g. the so-called diver's ear).
Accordingly, conventional in-ear hearing aids incur the problem that even if the installed components could be kept unchanged over many years, so that for instance only the transfer function of the hearing aid would have to be readjusted for the particular hearing conditions, nevertheless new hearing -aids must be designed just on the account alone that the previous shaping no longer properly fits into the auditory canal.
The approach as was elucidated in section 3) already offers the possibility to improve on such drawbacks because they enable automatic shape matching of the ear device to changing shapes of the application areas. In the present section further measures shall be explained, in particular relating to in-ear ear devices. Be it borne in mind that the measures as of this section also allow changing the “housing” of outside-the-ear ear devices such as of outside-the-ear hearing aids, not only when required for comfort of wearing but also as desired, for instance to alter the esthetic appearance of such outside-the-ear hearing aids.
The design shown in the
As shown by the
Again this embodiment can obviously be combined with the heretofore described embodiments and with those still to be described.
5. Integrating Acoustical Conductors into Ear Devices or into Their Shells
Both as regards outside-the-ear as well as in-ear hearing aids, it is conventional practice to couple on one hand acoustical/electrical input transducers or electro/acoustical output transducers provided therein on their input side or their output side respectively by means of acoustical conductors, which are assembled as independent parts in the form of tubular structures, to, on the other hand, the ambient of the hearing aid or, in particular as regards the input acoustical/electrical transducer, to mount them with their reception surfaces adjacent to the surface of the hearing aid, possibly only separated by minor cavities and protecting devices towards the ambient.
Thereby when conceiving such hearing aids there is present a relatively large dependency, where in the hearing aid the converters and where in the hearing aid the coupling openings to the ambient are placed. it would be highly desirable to have largest possible conceptual freedom with respect to placing coupling openings to the ambient and placing the said converters or transducers within the hearing aid.
This goal is principally attained in that the acoustical conductors mentioned—at the input side of the acoustic/electrical converters or at the output side of the electrical to acoustical converters—are integrated into the ear device or in the wall of the ear device shell.
This feature is shown purely schematically in
6. Identification of Ear Devices
When manufacturing ear devices, in particular in-ear ear devices, each is matched individually to its particular wearer. Therefore it would be extremely desirable to identify each finished ear device, thereby especially each in-ear ear device and thereby most particularly each in-ear hearing aid. Therefore it is proposed to provide within the ear device or within its shell an individual identification by means of intrusions and/or extrusions which besides of the individual purchaser may identify e.g. the manufacturer, may further define for a serial number of the product, may identify whether the device is to be worn on the left or on the right hand side. Such an identification is implemented most preferably during the manufacturing of the ear device with the built-up processes as were described under section 1). By such identification it is made sure that departing from manufacturing any mix up of devices is prevented. This is especially important for a subsequent possibly automated assembly with further modules, so e.g. during assembling of in-ear hearing aids. This procedure may obviously be combined with one or more than one of the procedures and aspects as described under the sections 2) to 5).
7. Optimizing Ear Devices with Respect to the Dynamics of the Area Where They are to be Applied
When taking the shape of ear devices for in-ear applications, so e.g. for in-ear hearing aids, it is today customary to take from the auditory canal e.g. with silicon, a mold. Under consideration of the relatively large movement dynamics of the auditory canal, e.g. during chewing, it is evident that basing the shaping of the in-ear ear device practically on one instantaneous situation and making a mold in this situation may hardly lead to a result which may completely satisfy when wearing the resultant ear device. As is shown in
Subsequently such molds are scanned, and the respective digitalized data sets are stored in the storage unit 95. A further possibility e.g. resides to register the dynamics of the application area by means of x-rays.
In dependency of the accuracy to be reached several “pictures” or even a “movie” of the pattern of movement of the respective application area is registered. The data registered in the store unit 95 are subsequently fed to a computer unit 97. The output of the computer unit 97 controls the manufacturing process 99 for the ear device. If e.g., and as customary today, in-ear ear devices are manufactured with a relatively hard shell, the computer unit 97 calculates from the dynamic data as stored in unit 95 and possibly with the help of further manufacturing parameters as schematically shown at K the best fitting shape for the ear device so that an optimum comfort is reached when wearing the device in daily use and thereby maintaining its functional task. If the ear device is to be manufactured according to the section 3) of the description, the computer unit 97 calculates the characteristics of the different areas of the ear device with respect to flexibility, flexural behavior, compressability etc. At its output the computer unit 97 controls as was mentioned the manufacturing process 99, thereby preferably a manufacturing process as it was disclosed in section 1) as preferred manufacturing processes.