Patent Description:
To an increasing extent, electrically driven functionality is being used in various articles of clothing and accessories. Eyewear, such as glasses or spectacles, is no exception. For instance, known such functionality for eyewear comprises automatic shading of lenses. Such electrically driven functionality may be implemented using analogue circuitry and/or digitally implemented, electronic circuitry. In both cases, in general a battery is required to power the circuitry in question.

There is a problem charging such a battery. In particular, it is perceived as cumbersome to attach a cable to the eyewear for charging, not least since the eyewear may have rather fine geometric dimensions. Therefore, it is difficult to attach such a cable for charging. Also, when not worn, eyewear is commonly stored in places where such a cable-driven charger cannot easily be used, such as in a handbag. In addition, a charging plug is often perceived as aesthetically unattractive, and limits the design freedom of a designer.

The present invention solves this problem.

<CIT> discloses eyewear comprising a lens, a lens frame, a battery and a means for wireless charging of the battery. The wireless charging means comprises a receiver coil arranged so that it encircles one or several of said lenses.

<CIT> and <CIT> also disclose eyewear that can be wirelessly charged using a coil around a lens.

<CIT> discloses a coil for wireless charging of a cellphone. In one embodiment, a flexible printed circuit board (FPCB) is used. In one embodiment, a multi-layered pattern loop shape is used.

Hence, the invention relates to an eyewear comprising at least one lens, a lens frame, a battery and means for wireless charging of said battery, which wireless charging means comprises a receiver coil arranged to be remotely powered by a corresponding transmitter coil in a separate charging device, which eyewear is characterised in that the receiver coil is arranged so that is encircles at least one of said one or several lenses, forming part of or being enclosed in said lens frame, whereby light passing through the at least one lens will also pass through a coil hole (118e).

Furthermore, the herein a holder is disclosed for an eyewear of the said type, which holder comprises a transmitter coil arranged to power a corresponding receiver coil in said eyewear, and in that the holder comprises alignment means arranged to align the eyewear in a position allowing the said powering of the receiver coil by the transmitter coil.

In the following, the invention will be described in detail, with reference to exemplifying embodiments of the invention and to the enclosed drawings, wherein:.

The figures share the same reference numerals for same or corresponding parts. In general, what is said regarding one illustrated set of eyewear is equally relevant, as applicable, to the other described pieces of eyewear. The same applies regarding the holder in <FIG> vis-à-vis the various exemplifying pieces of eyewear.

The figures are simplified and in general not drawn to scale.

Hence, <FIG> illustrates a piece of eyewear <NUM>, comprising two lenses <NUM>, <NUM>. According to the invention, the eyewear <NUM> comprises at least one such lens <NUM>, <NUM>. In <FIG> a pair of glasses is shown with only one lens, covering both the eyes of a user when in use. It is, however, noted that the present invention may also be applied to other types of eyewear, such as welding masks, monocles, ski goggles, etc., which types of eyewear may feature one or more (usually not more than two) lenses.

The eyewear <NUM> further comprises two lens frames <NUM>, <NUM>, typically each enclosing a respective lens <NUM>, <NUM> in question. Similarly as regarding the lenses <NUM>, <NUM> themselves, it is realized that there may be one or more lens frames <NUM>, <NUM>.

Furthermore, the eyewear <NUM> comprises a battery <NUM>, arranged to power some electric or electronic functionality <NUM> used by the eyewear <NUM>. Examples of such functionality include an automatic shading functionality of the lenses <NUM>, <NUM>; a sensor functionality in the eyewear <NUM> for sensing some environment parameter such as light or sound; a built-in image viewing device for showing an image to a user of the eyewear <NUM>, and so on. What is important is that such functionality depends upon the battery <NUM> for power, why the battery <NUM> needs charging.

To this end, the eyewear <NUM> further comprises a battery charging means <NUM>, and in particular a means <NUM> for wireless charging of the battery <NUM>. The wireless charging means <NUM> comprises an inductive receiver coil <NUM>, arranged to be remotely powered by a corresponding transmitter coil <NUM> in a separate charging device (see <FIG>), for instance in the form of a holder <NUM> for the eyewear <NUM>.

According to the invention, the receiver coil <NUM> is arranged so that it encircles at least one of said one or several lenses <NUM>, <NUM>, forming part of or being enclosed in the respective lens frame <NUM>, <NUM> in question, whereby light passing through the at least one lens <NUM>, <NUM> will also pass through a coil hole.

Namely, the present inventors have realized that, by arranging the receiver coil around one or both of the lenses in a piece of eyewear, in particular in the preferred case of a pair of glasses or spectacles, it is possible to provide a powerful enough inductive coil so as to be able to develop a charging voltage which is sufficient to charge the battery <NUM> from a transmitter coil <NUM> as described herein. There are a number of ways to accomplish this, as is detailed in the following.

It is noted that a coil in general comprises one or several "coil hole". By this term is meant the main through hole through the coil, which all coil turns run around and define. This is also what the term "encircle" relates to - that the individual coil turns run around the periphery of such one or several coil holes.

It is furthermore noted that not all light passing through the one or several lenses <NUM>, <NUM> must pass through such a coil hole. However, it is preferred that at least half, preferably substantially all, of the light passing through the one or several lenses <NUM>, <NUM> also passes through the coil hole. This can be accomplished by the coil being arranged in a lens <NUM>, <NUM> plane, at or near the lens periphery, or substantially along an envelope surface defined by a cylinder defined by the lens <NUM>, <NUM> in question in the sense that the lens <NUM>, <NUM> circumference is a cross-section of such a cylinder.

In case of a wire coil, the coil turns can be wound around the lens or lenses <NUM>, <NUM> in question. In case of a printed circuit, the coil turns can be printed in turns in a structure encircling the lens or lenses <NUM>, <NUM>.

In general, it is preferred that the receiver coil <NUM> comprises at the most <NUM>, preferably at the most <NUM>, preferably at the most <NUM>, individual turns 181a. Also, it is preferred that the number of such turns 181a is at least <NUM>, preferably at least <NUM>, preferably at least <NUM>. Such number of turns has proved to be both sufficient for providing power to the charged battery while still minimizing the total volume of the receiver coil <NUM>, which is important for the presence of the coil <NUM> not deteriorating the design and/or function of the eyewear.

Regarding the cross-sectional area of the coil conductor 181b, it is realized that the conductor 181b may include a single thread or cable for each turn, or alternatively that several smaller conductive strands may be arranged in parallel so as to form each turn (for instance in a so-called Litz wire, comprising several individual parallel-arranged threads together forming each turn). Irrespectively of the number of such individual strands or threads, it is preferred that the total cross-sectional area of a set of at least one coil conductor (that is, one single conductor or a set of parallel conductors) forming each individual turn in said receiver coil is at the most <NUM><NUM>, preferably at the most <NUM><NUM>. Also, it is preferred that said total cross-sectional area of each turn is at least <NUM><NUM>, preferably at least <NUM><NUM>.

However, in practise the number of turns and the total cross-sectional area depends upon the required voltage to charge the battery; the available power from the transmitter coil <NUM>; the resistance of the coil <NUM> conductor material, and so on. In general, it is preferred that the inductance of the coil <NUM> is between <NUM> and <NUM>µH.

Preferably, the battery <NUM> is a lithium-ion battery, which requires at least about <NUM> V or slightly more for charging, why it is preferred that such a voltage is available from the receiver coil <NUM> when activated for charging in a predetermined geometric relation to a powered transmitter coil <NUM>, and that all parts of the transmitter <NUM> and the eyewear <NUM> are dimensioned and arranged so as to allow such a voltage to be produced during charging.

In general, preferred materials for the receiver coil <NUM> conductors include various metals, such as stainless steels, copper or copper alloys and silver; carbon materials; and electrically conductive polymers, preferably flexible such polymers.

Furthermore, it is preferred that the receiver coil <NUM> forms part of or is enclosed by the lens frames <NUM>, <NUM>. Irrespectively of whether the receiver coil <NUM> is completely enclosed by the lens frames <NUM>, <NUM> or not, it is preferred that the aggregate of both the lens frames <NUM>, <NUM> and the receiver coil <NUM>, at its thinnest point along the receiver coil <NUM>, is no more than <NUM> by <NUM> of cross-section. Furthermore, the lenses <NUM>, <NUM> are not flat, but curved about at least one, preferably two, curvature axes, and the lens frames <NUM>, <NUM> are correspondingly non-flat. As a result, the receiver coil <NUM> is not flat, in the sense that it does not extend in a plane. This is most often required for applications with glasses or spectacles, such as reading glasses or sunglasses. The present invention, in its various embodiments, makes it possible to efficiently charge the battery <NUM> wirelessly, even with such a non-flat receiver coil <NUM>.

According to a not claimed example, the conductors 181a forming the turns of the receiver coil <NUM> are metal wires, such as round profile steel or copper wires. In one not claimed example, apart from being arranged to receive inductively transferred electric energy from the transmitter coil <NUM>, the receiver coil <NUM> then also forms a substantial structural stability element of the eyewear <NUM>. This means that, without the receiver coil <NUM>, the eyewear <NUM> would not have sufficient mechanical stability, such as bending resistance, for normal intended use. For instance, the receiver coil <NUM> may be encapsulated by a thin layer of plastic, whereby the receiver coil <NUM> forms the main structural element of the lens frames <NUM>, <NUM>, providing mechanical stability to the frames <NUM>, <NUM> while the said plastic layer protects the receiver coil <NUM> and provides a desired aesthetic appearance. Another example is that the receiver coil <NUM> forms a visible part of the lens frames <NUM>, <NUM>, if this is desired from an aesthetical point of view. The individual receiver coil <NUM> conductors may be insulated as required.

However, according to the invention, conductors 181b forming the turns of the receiver coil <NUM> are printed on a multilayer circuit 181c, which in turn is mounted in or on the eyewear <NUM>, as an integrated part thereof. For instance, such a circuit 181c may be glued between two layers of the frame <NUM>, <NUM>, or be encapsulated by plastic material during the manufacturing process of the frame <NUM>, <NUM>.

Herein, the expression "multilayer circuit" refers to a circuit, such as a circuit board, 181c having more than one layer of conductors, where the layers are interconnected. Hence, each such layer then comprises one or several ones of said receiver coil turns 181a, and each layer is interconnected with its one or several neighbours so as to form the connected receiver coil <NUM>. See <FIG> for an example.

Such multilayer circuits 181c are as such conventional, and are not described in any detail herein. However, it is noted that the substrate of such a circuit 181c may be a stiff material, such as comprising glass fibre material. In this case, the circuit 181c may form a stabilizing element with a function corresponding to the above described one, in terms of providing a substantial structural stability element of the eyewear <NUM>.

However, according to the invention, the circuit 181c is a multilayer flexible printed circuit (FPC), in other words a printed multilayer circuit which is printed on a substrate which is flexible, making the resulting circuit flexible. Such a multilayer flexible printed circuit may also be or comprise a so called flat flexible cable (FFC) and/or a so called rigid-flex cable. What is important is that the circuit is at least partly flexible. Suitable substrate materials comprise films of polyester, polymide, polyethylene naphtalate, polyetherimide and fluoropolymers and copolymers. Such flexible printed circuits are as such well-known, and are used, for instance, in digital cameras and computer keyboards.

For such a flexible multilayer circuits 181c, it is preferred that each individual conductor 181b, in cross-section, is between <NUM> and <NUM> thick, and between <NUM> and <NUM> wide, preferably between <NUM> and <NUM> wide. One preferred arrangement of the receiver coil <NUM> conductors 181b is one in which there are at least four layers 181d of at least four conductors 181b on each such layer, forming the receiver coil <NUM>. This is illustrated in <FIG>. Preferably, there are less than <NUM> layers carrying the receiver coil <NUM>.

Using the present invention, it is possible to provide a receiver coil <NUM> which can be used for efficient wireless charging even in the case in which the lens frames <NUM>, <NUM>, along which frames <NUM>, <NUM> the receiver coil <NUM> is arranged, has a local curvature radius of between <NUM>-<NUM> along the length of the receiver coil <NUM>, which is preferred. It is noted that the lens <NUM>, <NUM> itself may also have a certain curvature, which may be in addition to the curvature of the lens frames <NUM>, <NUM> in question.

In particular when using a stiff or flexible printed circuit 181c, it is preferred that the lens frame <NUM>, <NUM> curvature is approximated using a set of straight line segments, between <NUM> and <NUM> of length, which simplifies the design and manufacturing process.

In general, and in particular for the said flexible printed circuit 181c, the battery charging means <NUM> comprises circuitry <NUM> for providing a desired voltage to the battery <NUM>. Furthermore, as mentioned above, the eyewear <NUM> also comprises circuitry <NUM> for performing other tasks, i.e. additional functionality. Such circuitry <NUM>, <NUM> is arranged in a temple <NUM>, or different temples <NUM>, <NUM>, of the eyewear <NUM>, so that the said flexible printed circuit extends past a respective hinge <NUM>, <NUM> of the eyewear <NUM>. This way, the flexible printed circuit extends, in one integrated piece, from the respective lens frame <NUM>, <NUM> to a respective temple <NUM>, <NUM>, past the hinge <NUM>, <NUM>, without using connectors or the like, and still be able to deliver electric connectivity and power transfer across the hinge <NUM>, <NUM> even when the hinge <NUM>, <NUM> bends at different angles. This provides for a very low-cost production of the eyewear while still maintaining full flexibility in terms of functionality and geometric arrangement of the various parts <NUM>, <NUM>, <NUM> across the temples <NUM>, <NUM>. As described above, such flexible printed circuit 181c can also be designed so as to provide sufficient charging power while still not becoming too bulky to fit as a part of the lens frames <NUM>, <NUM>.

A simplified plan view of the outer shape of an exemplifying single flexible printed circuit 181c is illustrated in <FIG>.

An exemplifying arrangement of components is illustrated in <FIG>, where the battery <NUM> is arranged in one of the temples <NUM> while the additional circuitry <NUM> is arranged in the other temple <NUM>. The battery charging circuitry <NUM> is also arranged in the other temple <NUM>. Then, all these components <NUM>, <NUM>, <NUM> are electrically interconnected across both hinges <NUM>, <NUM> by one or several flexible printed circuit of the above discussed kind, preferably a single such flexible printed circuit, which can be inexpensively mounted in one single step during manufacturing of the eyewear <NUM>.

According to one preferred embodiment, the wireless charging means <NUM> further comprises a digital control means, which may be the same as the battery charging circuitry <NUM>, arranged to control a power, a current and/or a voltage developed in the receiver coil <NUM>. Then, the digital control means is preferably further arranged to transmit, digitally, information regarding a state of the eyewear <NUM>, and in particular information regarding a current battery <NUM> charging state, to the transmitter coil <NUM> via modulation of the said power, current, voltage and/or frequency in a way which is detectable remotely by the transmitter coil <NUM> and associated circuitry in the charging device <NUM>. Hence, in this case there is a digital communication, using a predetermined format and protocol, from the eyewear <NUM> to the charging device <NUM>, for instance signalling that the battery <NUM> is fully charged. Examples of such communication standards comprise the one prescribed by the Qi standard for wireless charging.

Further in the case when the eyewear <NUM> is a pair of glasses or spectacles, <FIG> illustrate different preferred arrangements of the receiver coil <NUM>.

In <FIG>, the receiver coil <NUM> is arranged as two separate, but preferably electrically interconnected, coils around two different lenses <NUM>, <NUM>. In this case, the coils <NUM> may provide separate induced voltages to the battery charging circuitry <NUM>, arranged to be inductively activated by two corresponding different transmitter coils <NUM>, or together form one single coil.

In <FIG>, the receiver coil <NUM> is arranged as one single coil enclosing both lenses <NUM>, <NUM> in a non-overlapping (without coil <NUM> conductor 181b crossings) manner. In fact, in <FIG>, the lenses <NUM>, <NUM> are in fact only one, interconnected lens, which the coil <NUM> encircles as part of the lens frame <NUM>, <NUM>, which is, correspondingly, one single lens frame enclosing at least part of the single lens.

In <FIG>, the receiver coil <NUM> is arranged as one single coil enclosing both lenses <NUM>, <NUM> in a figure-eight shape with coil overlap between the said two different lenses <NUM>, <NUM>.

It is noted that other examples are possible, such as one single lens with two coils, where a centre frame piece covers part of the coils (and the corresponding portion of the common lens). Furthermore, <FIG> could also use such a centre frame piece, so that one single lens could be used with a figure-eight shape.

In these and other cases, it is preferred that the circumference of the receiver coil <NUM> or each receiver coil <NUM> is between <NUM> and <NUM>.

<FIG> illustrates yet another preferred embodiment, according to which the eyewear <NUM> comprises a detachable protection means <NUM>, arranged to be detachably attached, such as using a Velcro® flap, to the eyewear <NUM> so that it encloses at least one, preferably both, lenses <NUM>, <NUM>. In cases where the eyewear <NUM> only has one lens, this lens is then enclosed correspondingly. Preferably, the detachable protection means <NUM> covers the lenses <NUM>, <NUM> in question snugly, so that the overall shape of the eyewear <NUM> is substantially unaffected by mounting the protection means <NUM> thereon. Then, the detachable protection means <NUM> comprises a material with high initial permeability, suitable for <NUM>-<NUM> applications, such as an initial permeability of between <NUM>-<NUM> Hm-<NUM>,, preferably between <NUM>-<NUM> Hm-<NUM>, providing electrical shielding to the receiver coil <NUM>.

Preferably, the shielding comprises a magnetic layer, such as ferrite, arranged along the lens <NUM>, <NUM> in question when enclosed by the protective means <NUM>, which increases charging efficiency and protects electronics in the eyewear <NUM>, as well as externally arranged metal objects arranged close to the charging circuits, from thermal stress due to eddy currents within the metal material, during charging. The said layer may comprise a layer of magnetic powder, such as ferrite powder. Furthermore, the said layer may also comprise a layer of a non-magnetic metal foil, such as an aluminium foil. This way, necessary electrical shielding for complying with an existing wireless charging standard, such as the Qi standard mentioned above, can be achieved by the detachable protection means <NUM>, and the protection means <NUM> is preferably mounted on the eyewear <NUM> when the latter is being charged. To the contrary, no such shielding would then be necessary at the lens frames <NUM>, <NUM> themselves, providing more design freedom for the eyewear <NUM>. This is the preferred case.

In particular, the protection means <NUM> can also be used only for lens <NUM>, <NUM> protection when the eyewear <NUM> is not used. For this reason, it is preferred that the protection means <NUM> is not arranged to cover a temple <NUM>, <NUM>, or the temples <NUM>, <NUM>, but only both sides of the lenses <NUM>, <NUM> and the lens frames <NUM>, <NUM>.

Preferably, the protection means <NUM> is entirely electrically passive, in the sense that it is not powered by an internal or external electric power source.

It is noted that such a protection means <NUM> could also be sold separately.

<FIG> illustrate the above mentioned charging means, in the form of a holder <NUM> for the eyewear <NUM>. It is noted that the eyewear <NUM> is specifically designed for being held by the holder <NUM>, and for being wirelessly charged therefrom when being held, and/or that the holder <NUM> is specifically designed for holding the eyewear <NUM> therein and wirelessly charging the eyewear <NUM> when being held therein.

The holder <NUM> comprises a transmitter coil <NUM>, arranged to power the corresponding receiver coil <NUM> in the eyewear <NUM>. As discussed above, several transmitter coils may also be arranged to power several corresponding receiver coils, as the case may be. Furthermore, the holder <NUM> comprises alignment means <NUM> arranged to align the eyewear in a position allowing the said powering of the receiver coil <NUM> by the transmitter coil <NUM>. Such alignment means <NUM> may be in the form of an accommodating space <NUM> inside the holder <NUM> being small enough and shaped so as to not allow the eyewear <NUM> to be oriented in a way not enabling wireless charging when the eyewear <NUM> is accommodated in the holder <NUM>. However, it is preferred that specific internal geometric details inside the accommodating space <NUM> are designed to correspond to specific external geometric details of the eyewear <NUM>, such as around the location where two lens frames <NUM>, <NUM> meet on the eyewear <NUM>, so that it is impossible for the holder <NUM> to fully accommodate the eyewear <NUM> unless properly oriented in the holder <NUM>. For this purpose, it is also preferred that the holder <NUM> can be opened and closed, such as using a lid <NUM> with a hinge <NUM>, which lid <NUM> cannot be completely closed unless the eyewear is properly oriented in the holder <NUM>.

This allows for the transmitter coil <NUM> to be very precisely oriented in relation to the receiver coil <NUM> when the eyewear <NUM> is accommodated in the holder <NUM>, providing prerequisites for efficient, low-loss charging.

Preferably, the holder <NUM> is arranged to, during charging, apply an alternating current through the transmitter coil <NUM>.

In general, the holder <NUM> may be a glasses or spectacle case, arranged for storing the glasses or spectacles <NUM> when not used, and at the same time doubling as a charging station.

The holder <NUM> comprises a power supply <NUM>, which may comprise or be connectable to a wall socket connector, a transformer, and so forth. It is furthermore preferred that the power supply <NUM> comprises a battery, so that the holder <NUM> does not have to be connected to a wall socket in order to charge the eyewear <NUM>. The holder <NUM> battery preferably has a capacity which is at least twice, preferably at least five times, that of the eyewear <NUM> battery <NUM>.

Regarding the alignment means <NUM>, these preferably further comprise an activating means <NUM> arranged to be activated when the eyewear <NUM> is correctly positioned for charging in the holder <NUM>. The activating means <NUM> may, for instance, be in the form of a mechanically operating pushbutton which is pressed in as a result of the lid <NUM> being closed with the eyewear <NUM> accommodated in the holder <NUM>. Alternatively, the activating means <NUM> may comprise an open electric circuit, arranged to be shortcut by corresponding electric connectors arranged on the eyewear <NUM> when the eyewear <NUM> is positioned in the correct orientation in the holder <NUM>, or a combination of these and/or any number of as such conventional options to this end. Then, the holder <NUM> is arranged to initiate wireless charging of the eyewear <NUM> automatically, in reaction to the activating means <NUM> being activated.

It is noted that the receiver coil <NUM> is never put into direct electric contact with the transmitter coil <NUM> or the holder <NUM> power supply <NUM>, and that all charging of the eyewear <NUM> battery <NUM> is always conducted wirelessly.

In <FIG>, the holder <NUM> is shown in an opened state. In <FIG>, the cross-section shows the holder <NUM> with the eyewear <NUM> in the correct charging orientation inside the closed holder <NUM>, during wireless charging of the eyewear <NUM>.

Specifically in the case in which the holder <NUM> comprises the said lid <NUM>, it is preferred that the holder <NUM> is arranged to accommodate the eyewear <NUM> in the said correct charging orientation, in which a forward-facing lens side 110c of the eyewear (the side of the lens facing away from the user's eye during normal use) faces an interior side <NUM> of the lid <NUM>. Then, the transmitter coil <NUM> is arranged in the lid <NUM> so that, when the eyewear <NUM> is accommodated in the holder <NUM> and the lid <NUM> is fully closed, the transmitter coil <NUM> is arranged at a distance of maximally <NUM>, preferably maximally <NUM>, from the receiver coil <NUM> and substantially parallel to the receiver coil <NUM>.

Above, preferred embodiments have been described. However, it is apparent to the skilled person that many modifications can be made to the disclosed embodiments without departing from the basic idea of the invention.

For instance, the invention may be applied to many types of eyewear apart from the glasses shown in the Figures, and many different designs of glasses can also be provided with wireless charging functionality according to the present invention.

Also, the eyewear described herein can also be arranged for wireless or wired charging using other devices than the described holder <NUM> and flat-surface Qi chargers.

Claim 1:
Eyewear (<NUM>) comprising at least one lens (<NUM>,<NUM>), a lens frame (<NUM>,<NUM>), a battery (<NUM>) and means for wireless charging of said battery (<NUM>), which wireless charging means comprises a receiver coil (<NUM>) arranged to be remotely powered by a corresponding transmitter coil (<NUM>) in a separate charging device (<NUM>), the receiver coil (<NUM>) is arranged so that it encircles at least one of said one or several lenses (<NUM>,<NUM>), forming part of or being enclosed in said lens frame (<NUM>,<NUM>), whereby light passing through the at least one lens (<NUM>,<NUM>) will also pass through a coil hole (118e) characterised in that conductors (181b) forming the turns (181a) of the said receiver coil (<NUM>) are printed on a multilayer flexible printed circuit (FPC) (181c) wherein each layer of said printed circuit (181c) comprises several turns (181a) of the receiver coil (<NUM>), in that the multilayer flexible printed circuit (181c) in turn is mounted in the eyewear (<NUM>), and in that the lens frame (<NUM>,<NUM>) is not flat but instead curved about at least one curvature axis, so that the receiver coil (<NUM>) is also not flat,
wherein the eyewear (<NUM>) comprises circuitry (<NUM>,<NUM>) for providing a desired voltage to the battery (<NUM>) and/or for performing other tasks, wherein the circuitry (<NUM>,<NUM>) is arranged in a temple (<NUM>,<NUM>) of the eyewear (<NUM>), so that the flexible printed circuit (181c) extends past a hinge (<NUM>,<NUM>) of the eyewear (<NUM>).