NL2022295B1 - Luminaire system with movable support - Google Patents

Abstract

A luminaire system comprising a first support, a second support movable With respect to said first support, and a moving means configured to move the second support relative to the first support, 5 such that a position of the second support With respect to the first support is changed. The moving means comprises an actuation element configured to be moved along a first trajectory, and a conversion element configured to convert the movement of the actuation element into a movement of the second support along a second trajectory at an angle to said first trajectory. A plurality of light sources is arranged on one of the first support and the second support, and is configured to 10 emit light through one or more optical elements associated With the plurality of light sources and arranged on the other one of the first support and the second support. Figure 1A

Description

LUMINAIRE SYSTEM WITH MOVABLE SUPPORT

FIELD OF INVENTION The present invention relates to luminaire systems. Particular embodiments relate to a luminaire system with adjustable photometry.

BACKGROUND Currently, in the luminaire production, it is necessary to design a specific printed circuit board (PCB) serving as a support for light sources together with a specific optical element type and shape for each luminaire application, e.g. pedestrian road, highway, one-way road, etc. The overall design depends notably on the desired lighting pattern on the surface to be illuminated, i.e. the desired shape of the light onto the illuminated surface. Such approach is costly, time consuming, and requires extensive stock keeping. It would therefore be advantageous to be able to design a luminaire system with a more adaptive approach for which the photometry can be modified on site and/or at the factory, depending on the application and the desired light distribution. Several solutions exist for outdoor lighting equipment presenting optical elements adjustable on an individual basis or within relatively restricted boundaries. However, the flexibility of use of the luminaire systems remains limited and there is a need for a luminaire system which can be adapted to each site and desired usage.

SUMMARY The object of embodiments of the invention is to provide a luminaire system whose light distribution can be varied and which is more adaptable to each site to be illuminated and/or to a specific application. More in particular, embodiments of the invention aim to provide a luminaire system for which the photometry can be adjusted on site and/or at the factory.

According to a first aspect of the invention, there is provided a luminaire system. The luminaire system comprises a first support, a second support movable with respect to said first support, and a moving means configured to move the second support relative to the first support, such that a position of the second support with respect to the first support is changed. The moving means comprises an actuation element configured to be moved along a first trajectory, and a conversion element configured to convert the movement of the actuation element into a movement of thesecond support along a second trajectory at an angle o to said first trajectory. A plurality of light sources is arranged on one of the first support and the second support, and is configured to emit light through one or more optical elements associated with the plurality of light sources and arranged on the other one of the first support and the second support.

A common solution to adapt a luminaire system to a specific use or site is to mount optical elements specified for the corresponding use or site. Installing different optical elements depending on the site or desired use makes the installation task unnecessarily complicated. Moreover it adds the disadvantage of having to store several optical elements models for production and/or for IO maintenance. This problem is overcome by a luminaire system as defined above.

The light emitted by the plurality of light sources arranged on one of the first support and the second support will be influenced in a certain manner by the one or more optical elements comprised on the other one of the first support and the second support, and associated with the plurality of light sources. Having the plurality of light sources and the one or more optical elements on different supports allows making independent the positioning of one with respect to the other. Indeed, the moving means will allow a modification of their relative positioning. In such a way, the emitted light is correlated to different relative positions of the one or more optical elements with respect to the positions of the plurality of light sources, and can be adapted more easily to different sites and/or applications without having to mount different optical components. More in particular, embodiments of the invention allow a dynamic adaptation of the light distribution of the luminaire system based e.g. on changes occurring in its environment.

By using a moving means including on the one hand an actuation element and on the other hand a conversion element, the actuation element can be more easily accessed, and the integration of the moving means in the luminaire system can be more compact. More in particular, the first trajectory along which the actuation element is movable can be positioned and oriented in a more appropriate manner compared to systems using direct actuation.

Preferably, the luminaire system is included in a luminaire head. The first support may be fixed in the luminaire system, preferably in said luminaire head. This arrangement allows heat dissipation of the first support via thermal contact with the luminaire head. Alternatively, the first support may move in the luminaire system independently from the movement of the second support relative to the first support.

Preferred embodiments relate to a luminaire system of an outdoor luminaire. By outdoor luminaire, it is meant luminaires which are installed on roads, tunnels, industrial plants, campuses, parks, cycle paths, pedestrian paths or in pedestrian zones, for example, and which can be used notably for the lighting of an outdoor area, such as roads and residential areas in the public domain, private parking areas, access roads to private building infrastructures, etc. According to a preferred embodiment, the first support comprises said plurality of light sources, and the second support comprises said one or more optical elements. In this way, the second support comprising said one or more optical elements moves relative to the first support. According to an exemplary embodiment, the one or more optical elements comprise a plurality of lens elements associated with the plurality of light sources.

Indeed, lens elements may be typically encountered in outdoor luminaire systems, although other types of optical elements may be additionally or alternatively present in such luminaires, such as reflectors, backlights, prisms, collimators, diffusors, and the like. In the context of the invention, a lens element may include any transmissive optical element that focuses or disperses light by means of refraction. It may also include any one of the following: a reflective portion, a backlight portion, a prismatic portion, a collimator portion, a diffusor portion. For example, a lens element may have a lens portion with a concave or convex surface facing a light source, or more generally a lens portion with a flat or curved surface facing the light source, and optionally a collimator portion integrally formed with said lens portion, said collimator portion being configured for collimating light transmitted through said lens portion. Also, a lens element may be provided with a reflective portion or surface or with a diffusive portion. Alternatively, the one or more optical elements could be a transparent or translucent cover having a varying optical properties (e.g. variation of thickness, transparency, diffusivity, reflectivity, refractivity, color, etc.) along the movement direction of the second support. According to a preferred embodiment, the first trajectory and the second trajectory are substantially parallel to the first support. Preferably, the first trajectory corresponds to a straight line along an axis substantially parallel to the first support. Preferably, the second trajectory corresponds to a straight line along an axis substantially parallel to the first support.

In this way, the first trajectory and the second trajectory define a plane substantially parallel to the first support, and the second support is moved in said plane. In another embodiment, the first trajectory may correspond to a curved line substantially parallel to the first support, and/or the second trajectory may correspond to a curved line substantially parallel to the first support. In yet another embodiment, the first trajectory may correspond to a straight line or a curved line in a direction substantially parallel to the first support, and/or the second trajectory may correspond to a straight line or a curved line along a direction non-parallel to the first support, thereby enabling a movement of the second support with respect to the first support in three spatial dimensions, not only in a plane substantially parallel to the first support. For example, the second support may be moved with respect to the first support in a direction substantially perpendicular to the first sapport.

According to a preferred embodiment, the conversion element is in a fixed position with respect to the second support. More preferably, the conversion element is coupled to or integrally formed with the second support.

In this manner, a compact integration of the conversion element in the luminaire system is achieved.

According to a preferred embodiment, the angle a is comprised between 60° and 120°. According to an exemplary embodiment, the second trajectory is substantially perpendicular to the first trajectory.

In this way, the conversion element may be configured to convert the movement of the actuation element along a first trajectory into a movement of the second support along a second trajectory at an angle o to said first trajectory comprised between 60° and 120°, for example substantially equal to 90°, In this manner, the actuation element may be moved close to the first and/or second support in a first direction, e.g. along an edge of the first and/or second support, while causing a movement in another desired direction, resulting in a compact luminaire system.

According to a preferred embodiment, the conversion element has a contact surface at an angle p with respect to the first trajectory, said contact surface being in contact with the actuation element. Said angle B is smaller than 90°, preferably smaller than 60°. Preferably, the contact surface is oriented perpendicular to the first support.

In this way, the contact between the actuation element and the conversion element at said angle B along the contact surface can cause the movement of the second support in an easy manner. According to an exemplary embodiment, the actuation element comprises an edge portion 5 configured to be moved along said contact surface, said edge portion having a surface area which is at least ten times smaller than the surface area of the contact surface. In this manner, the use of an edge portion of the actuation element minimizes the friction due to the contact between the actuation element and the conversion element along said contact surface, while enabling to save weight for the manufacture of the actuation element. Since the actuation element is configured to be moved, less energy is required in order to move it. According to a preferred embodiment, the luminaire system further comprises a guiding track fixed in the luminaire system. The actuation element is configured to be moved along said guiding track.

In this manner, the movement of the actuation element along said first trajectory is facilitated, and the direction of movement of the actuation element is accurately known. In an alternative embodiment, said guiding track may be fixed in a luminaire head including the luminaire system. According to an exemplary embodiment, the luminaire system further comprises a luminaire housing. The actuation element is arranged in said luminaire housing, and comprises a ferromagnetic material or a magnet element arranged such that the actuation element can be moved by means of a magnet element or a ferromagnetic material arranged outside the luminaire housing. Said ferromagnetic material may be arranged in or on the actuation element, or may be fixed on the actuation element and may protrude outside the actuation element to create a lever arm. In this way, a user may move the actuation element from outside the luminaire housing using the magnet element. Alternatively, the actuation element may comprise a magnet element arranged such that the actuation element can be moved by means of a ferromagnetic material arranged outside the luminaire housing. According to a preferred embodiment, the second support is arranged substantially parallel to the first support. The moving means is configured to move the second support substantially parallel to the first support. Preferably, the second support is arranged to move in contact with the first support.

In this way, the distance between the first support and the second support is zero and fixed, which allows for a better determination of the expected light distribution corresponding to different positions of the second support with respect to the first support. In another embodiment, the second support is arranged to move at a fixed/predetermined distance from the first support. To that end, the first support may be provided with distance elements on which the second support is movably supported. Optionally, a surface of the second support facing the first support, or a surface of the first support facing the second support, may be provided with tracks or guides cooperating with the distance elements. Such tracks or guides may be formed integrally with the rest of the second support, or with the rest of the first support, respectively. Optionally, the distance elements may be adjustable in order to adjust the distance between the first support and the second support. For example, the distance elements may comprise a screw thread cooperating with a bore arranged in/on the first or the second support. According to a preferred embodiment, the luminaire system further comprises a guiding means configured to guide the movement of the second support with respect to the first support along said second trajectory. In this manner, the movement of the second support is more controlled along said second trajectory, which results in a greater accuracy of the positioning of the optical elements respective to the light sources, or of the positioning of the light sources respective to the optical elements. According to an exemplary embodiment, the guiding means comprises a first sliding guide and a second sliding guide at opposite side edges of the second support. Alternatively, the first and second sliding guides may be arranged on the first support, or one of the first and second sliding guides may be arranged on the first support, and the other one of the first and second sliding guides may be arranged on the second support. This arrangement facilitates the guiding of the movement of the second support relative to the first support.

According to a preferred embodiment, the first or second support has a first side edge parallel to said second trajectory, a second side edge parallel to said second trajectory and opposite said first side edge. Preferably, the first sliding guide is arranged at said first side edge and the second sliding guide is arranged at said second side edge.

Arranging the first and second sliding guides respectively at a first and at a second side edge of the first or second support enables a compact design of the different elements inside the luminaire system.

According to an exemplary embodiment, the first sliding guide is connected to the first or second support and is in contact with a peripheral edge of the second or first support, respectively. The second sliding guide is connected to the first or second support and is in contact with said peripheral edge of the second or first support. Preferably, the guiding means is integrally formed with the second support.

This option enables to confer sufficient resistance to the guiding means, while saving space.

In another embodiment, the guiding means is integrally formed with the first support.

According to another exemplary embodiment, a plurality of elongated slits is arranged in the first or second support, and the guiding means comprises guiding elements extending through said elongated slits and fixed to the second or first support and/or to a component of the luminaire system.

This embodiment enables the guiding of the movement of the second support relative to the first support, while enabling the fixation of the first support inside the luminaire system in the case said guiding elements are fixed to the first support and to the luminaire system.

According to an exemplary embodiment, the moving means comprises a first moving means and a second moving means, said first moving means being configured to move the second support relative to the first support along a second trajectory, and said second moving being configured to move, independently from the first moving means, the second support relative to the first support along a fourth trajectory. The first moving means comprises a first actuation element configured to be moved along a first trajectory, and a first conversion element configured to convert the movement of the first actuation element into a movement of the second support along a second trajectory. The second moving means comprises a second actuation element configured to be moved along a third trajectory, and a second conversion element configured to convert the movement of the second actuation element into a movement of the second support along a fourth trajectory at an angle ao to said third trajectory.

In this way, the second support may be moved relative to the first support along a combination of the second trajectory and of the fourth trajectory. Preferably, the first and third trajectories respectively correspond to straight lines along two axes substantially parallel to the first support. Preferably, the second and fourth trajectories respectively correspond to straight lines along two axes substantially parallel to the first support. According to an exemplary embodiment, the third trajectory is substantially parallel to the second trajectory, and the fourth trajectory is substantially parallel to the first trajectory.

19 According to an exemplary embodiment, the first moving means is coupled to said third side edge, and the second moving means is coupled to said first side edge or to said second side edge. According to an exemplary embodiment, the luminaire system further comprises a guiding means configured to guide the movement of the second support with respect to the first support along a combination of said second trajectory and said fourth trajectory. For example, a plurality of square or star/cross-shaped slits may be arranged in the second support, and the guiding means may comprise guiding elements extending through said square or star/cross-shaped slits and fixed to the first support and/or to the luminaire system.

A square or star/cross shape of the slits enables a movement of the second support along a combination of the above-mentioned second and fourth trajectories. For example, the second support may then be moved in a plane formed by said second and fourth trajectories, said plane being substantially parallel to the first support.

According to a preferred embodiment, the luminaire system further comprises a spring element configured to exert a restoring force on the second support, along the second trajectory and/or the fourth trajectory.

An advantage of arranging a spring element is that the restoring force said spring element exerts on the second support allows a dynamic/reversible change of the position of said second support with respect to the first support.

According to an exemplary embodiment, the luminaire system further comprises an abutment surface at a fixed position in the luminaire system. The spring element comprises at least one connection portion connected to the second support, and at least one contact portion connected tosaid at least one connection portion and in contact with said abutment surface. Preferably, the abutment surface is a peripheral edge surface of the first support.

According to a preferred embodiment, the at least one contact portion of the spring element comprises at least two contact points in contact with said abutment surface.

In this manner, the at least two contact points in contact with said abutment surface enable the spring element to exert a restoring force on the second support when said second support is moved relative to the first support. Also, the compactness of the luminaire system can be increased.

According to an embodiment wherein the at least one contact portion is in contact with a peripheral edge of the first support, the at least one contact portion of the spring element may comprise at least two contact points in contact with said peripheral edge. A distance between said at least two contact points may be higher than 10% of a width of the first support and/or of the second support, preferably higher than 20% of said width, more preferably higher than 30% of said width. This distance is defined when the spring element is at rest, i.e. not submitted by any force arising from the movement of the second support relative to the first support.

Since the value of the spring constant of the spring element is related to the distance between said atleast two contact points, the above-mentioned lower bounds on said distance will allow to apply a reasonable force on the second support for moving it.

According to a preferred embodiment, the second support has a first side edge parallel to said second trajectory, a second side edge parallel or at an angle to said second trajectory and opposite said first side edge, a third side edge parallel or at an angle to said first trajectory, and a fourth side edge opposite said third side edge. The conversion element is coupled to said third side edge. Preferably, the spring element is configured to exert a restoring force on said third or fourth side edge.

Both options enable to obtain a compact arrangement of the different elements inside the luminaire system. In both options, the at least one contact portion of the spring element is in contact with said abutment surface, or with said peripheral edge.

According to a preferred embodiment, the spring element is integrally formed with the second support.

In this manner, the number of components needed to build the luminaire system is further reduced. Moreover, for cases when the second support comprises the one or more optical elements, since the second support will typically be molded with integrated optical elements, the manufacturing can be easily adjusted by changing the mold. This configuration also confers sufficient resistance and rigidity to the spring element. According to a preferred embodiment, the luminaire system further comprises a controlling means configured to control the moving means, such that the position of the second support with respect to the first support is controlled.

In this manner, moving the second support with the moving means is more precise for the positioning of the plurality of light sources or the positioning of the one or more optical elements. A greater precision of the movement will lead to a greater adaptability of the luminaire system.

According to an exemplary embodiment, the controlling means is configured to control the moving means to position the second support in a plurality of positions with respect to the first support, resulting in a plurality of lighting patterns on a surface, said plurality of lighting patterns having a plurality of different illaminated surface areas. A sensor may be located on the moving means, or on the first support, or on the second support, so as to determine the position of the second support with respect to the first support. In addition, a feedback loop may allow a more precise positioning of the plurality of optical elements respective to the plurality of light sources, or vice versa, by controlling the moving means based on data continuously or regularly supplied by the sensor. Alternatively or additionally, marks may be present on the moving means, for example on the guiding track, or on the first support, or on the second support, for indicating the positioning of the plurality of optical elements respective to the plurality of light sources, or vice versa. Said marks may e.g. correspond to numbers, letters, symbols, a scale.

In this way, the luminaire system has a greater variety of light distributions and is more adaptable to different uses or sites.

According to a preferred embodiment, an optical element of the one or more optical elements has an internal dimension along said second trajectory. and the controlling means is configured to control the moving means such that the second support is moved relative to the first support over a distance below 90% of the internal dimension of the optical element, preferably below 50% of the internal dimension of the optical element.

In this manner, changes in the light distribution are achieved by changes in the profile of an optical element in the direction of movement. Movements would only need to be limited such that the light emitted by the light sources is distributed in an adequate manner by the corresponding optical elements. The mentioned adequate manner can correspond to a movement whose distance is below 90%, preferably below 50%, of the internal dimension of the optical element such that the light sources can be kept in correspondence with their respective optical elements. Optical elements such as lenses and collimators may possess an internal dimension as defined above. In another embodiment, the luminaire system comprises more optical elements than light sources, and the controlling means is configured to control the moving means such that the second support is moved relative to the first support in a such a way that a given light source is moving from one optical element to another optical element. According to a preferred embodiment, the second support and the first support are arranged such that an optical element of the one or more optical elements extends over a corresponding light source of the plorality of light sources. According to an embodiment wherein the second support comprises said one or more optical elements, optionally in combination with any one of the embodiments described above, the second support may comprise an optical plate integrating the one or more optical elements. Optionally, the optical plate may be carried by a frame. In another embodiment, the second support may be the optical plate without a frame. For example, when the optical plate is sufficiently rigid, it may be used without a frame. In yet another embodiment, the plurality of optical elements may be separately formed and the second support may comprise a frame carrying the plurality of optical elements.

In this manner, the optical elements can be more easily replaced in case of maintenance. Also, the moving of the optical plate/optical elements may be more easily achieved. According to another embodiment wherein the first support comprises said one or more optical elements, optionally in combination with any one of the embodiments described above, the first support may comprise an optical plate integrating the one or more optical elements. Optionally, the optical plate may be carried by a frame. In another embodiment, the first support may be the optical plate without a frame. For example, when the optical plate is sufficiently rigid, it may be used without a frame. In yet another embodiment, the plurality of optical elements may be separately formed and the first support may comprise a frame carrying the plurality of optical elements.

According to an embodiment wherein the one or more optical elements comprise a plurality of lens elements, optionally in combination with any one of the embodiments described above, a lens element of the plurality of lens elements has a first surface and a second surface located on opposite sides thereof. The first surface is a convex or planar surface and the second surface is a concave or planar surface facing a light source of the plurality of light sources.

In this manner, the light source placed at the second surface side of the lens element has its emitted light being spread. The shape of the lens element and position of the lens element with respect to the light source will influence the distribution and intensity profile of the emitted light.

According to a preferred embodiment, the light sources are arranged in a two-dimensional array of at feast two rows and at least two columns.

{5 In this way, the mounting and connecting of the plurality of light sources on the first support or on the second support is simplified. Similarly, the one or more optical elements may be arranged in a two-dimensional array of at least two rows and at least two columns.

According to a preferred embodiment, the luminaire system further comprises a light driver configured to drive the plurality of light sources. In some embodiments, the light driver may be further configured to drive other components of the luminaire system, for example to drive the actuation means.

In this manner, the energy supplied to the light sources is controlled by the light driver. The optional addition of a light dimmer allows obtaining a greater variety of light distributions by varying the light intensity of some or all of the plurality of light sources in addition to the positioning of the light sources respective to the optical elements, or vice versa. Preferably, the plurality of light sources is a plurality of LEDs. Moreover, the dimming level may be different from one light source to another.

According to a preferred embodiment, the luminaire system further comprises a sensing means configured to acquire a measure for a position of the second support relative to the first support. The controlling means may be configured to control the moving means in function of the acquired measure.

In this manner, the sensing means can obtain the position of the second support relative to the first support and a specific desired light distribution corresponding to a specific position of the second support can be achieved by the movement of the second support with respect to the first support controlled by the controlling means.

According to an exemplary embodiment, the luminaire system further comprises an environment sensing means configured to detect environmental data. The controlling means may be configured to control the moving means in function of the detected environmental data. In another embodiment, the environment sensing means may be provided to another component of a luminaire, e.g. to a pole of the luminaire, or in a location near the luminaire. In this way, the environment sensing means can detect environmental data, e.g. luminosity, visibility, weather condition, sound, dynamic object, of the surroundings of the luminaire system. The environment sensing means may already be provided to the luminaire system or may be added in a later phase of the luminaire system installation. Controlling the moving means in function of the detected environmental data may allow changing the light distribution, and thus the lighting pattern of the luminaire system in accordance with the detected environmental data in a more dynamic manner, e.g. compensating luminosity depending on weather, changing to a lighting pattern more adapted for a passing cyclist.

According to a preferred embodiment, the luminaire system further comprises a pattern sensing means, e.g. a camera, configured to acquire a measure for a lighting pattern produced by the luminaire system. The controlling means may be configured to control the moving means in function of the acquired measure. In another embodiment, the pattern sensing means may be provided to another component of a luminaire, e.g. to a pole of the luminaire, or in a location near the luminaire. In this manner, the pattern sensing means can acquire a measure of a lighting pattern associated with a corresponding position of the plurality of optical elements. Then, controlling the moving means in function of the acquired measure will enable a more adapted lighting pattern to be achieved relative to the current environment of the luminaire system. Further, acquiring a measure of the surface area associated with the lighting pattern will enable the correlation between a position of the plurality of optical elements and the resulting lighting pattern. In an embodiment with a feedback loop, the controlling means may correct, and more in particular may regularly or continuously correct the position of the plurality of optical elements respective tothe plurality of light sources based on the sensed data, e.g. data from the pattern sensing means, data from the environment sensing means or data from a sensing means configured to acquire a measure for a position of the second support relative to the first support. It is noted that also data from any sensing means of nearby luminaire systems may be taken into account when correcting the position. For example, if a luminaire is positioned between two other luminaires, the lighting patterns thereof may partially overlap. The lighting pattern measured by the central luminaire may also be used to correct the position of the one or more optical elements respective to the plurality of light sources of the other two luminaires.

According to an exemplary embodiment, the controlling means is configured for controlling the moving means and the driver and optionally the dimmer to control the movement, the intensity, the flashing pattern , the light colour and/or the light colour temperature, respectively. Preferably. the controlling means is configured to set a particular position of the second support relative to the first support in combination with a light intensity and/or a flashing pattern and/or light colour and/or a light colour temperature. In the context of the present application “light colour data” can refer to data for controlling a colour (e.g. the amount of red or green or blue) and/or data for controlling a type of white light (e.g. the amount of “cold” white or the amount of “warm” white).

According to an exemplary embodiment, a lens element of the plurality of lens elements has an internal surface facing a light source of the plurality of light sources and an external surface. The internal surface and/or the external surface may comprise a first curved surface and a second curved surface, said first curved surface being connected to said second curved surface through a connecting surface or line comprising a saddle point or discontinuity. The second support is movably arranged relative to the first support to position the light source either in at least a first position facing the first curved surface or in at least a second position facing the second curved surface. When the external surface is implemented as described, preferably the external surface comprises a first outwardly bulging surface, a second outwardly bulging surface, and an external connecting surface or line connecting said first and second outwardly bulging surfaces. However, it is also possible to have a continuous outer surface and to implement only the internal surface as described. When the internal surface is implemented as described, preferably the internal surface comprises a first outwardly bulging surface, a second outwardly bulging surface, and an internal connecting surface or line connecting said first and second outwardly bulging surfaces. The term “outwardly bulging surface” is used here to refer to a surface which bulges outwardly, away from an associated light source. An outwardly bulging external surface forms a protruding portion, whilst an outwardly bulging internal surface forms a cavity facing an associated light source.

By providing such curved surfaces, the lens element is given a “double bulged” shape allowing to generate distinct lighting patterns depending on the position of the light source with respect to the lens element.

More in particular, the shape, the size and the location of the light beam may be different depending on the position of the light source with respect to the lens element.

This will allow illuminating various types of roads or paths with the same laminaire system.

Also, this will allow adjusting a lighting pattern in function of the height at which the luminaire system is located above the surface to be illuminated.

Preferably, each lens element has a circumferential edge in contact with the first/second support, IO and the internal connecting surface or line is at a distance of the first/second support, depending on which one of the first support and the second support comprises the lens elements.

Preferably, the first outwardly bulging surface and the first/second support delimit a first internal cavity, the second outwardly bulging surface and the first/second support delimit a second internal cavity, and the internal connecting surface or line and the first/second support delimit a connecting passage between the first and second internal cavity.

Such a connecting passage will allow a light source to pass from the first to the second cavity and vice versa.

Preferably, a first maximal width of the first internal cavity, and a second maximal width of the second internal cavity are bigger than a third minimal width of the connecting passage between the first and second internal cavity.

The first and second maximal widths and the third minimal width extend in the same plane, preferably an upper plane of the first/second support, in a direction perpendicular to the moving direction.

The first and second maximal widths may also be different.

The widths are measured in a lower plane of the lens element, delimiting the open side of the cavities, and the maximal width corresponds to a maximal width in this plane.

When the lens element is supported on the first support, this plane corresponds with a surface of the first support.

Preferably, the first curved surface is at a first maximal distance of the first/second support, the second curved surface is at a second maximal distance of the first/second support, and the saddle point or discontinuity is at a third minimal distance of the first/second support, said third minimal distance being lower than said first and second maximal distances.

More preferably, the first and second maximal distances are different.

Those characteristics may apply for the external and/or internal curved surfaces.

In an exemplary embodiment, the luminaire system is included in a luminaire head having a fixation end configured for being attached to a pole.

The first maximal distance defined above is larger than the second maximal distance defined above, and the lens element is arranged such thatthe first internal and/or external curved surface is closer to the fixation end of the luminaire head than the second internal and/or external curved surface. In an exemplary embodiment, the lens element further comprises at least one reflective element configured to reflect a portion of the light emitted by the light source, wherein preferably said at least one reflective element comprises a first reflective surface located at a first edge of the first curved surface and a second reflective surface located at a second edge of the first curved surface, wherein the second edge is an edge near the connecting surface or line and the fist edge is opposite the second edge, away from the connecting surface or line. Alternatively or additionally, the light IO source may be provided with a reflective element. Using one or more reflective elements, light may be directed to the street side of the luminaire in a more optimal manner. The first and/or second curved surfaces may have a symmetry axis at least locally parallel to the moving direction. In an exemplary embodiment, both first and second curved surfaces have a symmetry axis at least locally parallel to the moving direction. However, it is also possible to design the first curved surfaces with a symmetry axis whilst giving the second curved surfaces an asymmetric design or vice versa, or to design both the first and the second curved surfaces in an asymmetric manner. This will allow to obtain a symmetrical light beam in a first position of the light source relative to the lens element, and to obtain an asymmetrical light beam in a second position of the light source relative to the lens element. In the examples above a lens element comprises two adjacent curved surfaces bulging outwardly, but the skilled person understands that the same principles can be extended to embodiments with three or more adjacent curved surfaces bulging outwardly. Also, it is possible to provide a lens element with an array of bulged surfaces, e.g. an array of n x m bulged surfaces with n >=1 and m >=].

BRIEF DESCRIPTION OF THE FIGURES This and other aspects of the present invention will now be described in more detail, with reference to the appended drawings showing a currently preferred embodiment of the invention. Like numbers refer to like features throughout the drawings. Figures 1A-1C illustrate top views of an exemplary embodiment of a luminaire system;

Figures 2A-2D respectively illustrate a top view of an exemplary embodiment of a moving means of a luminaire system, a top view of another exemplary embodiment of a luminaire system, and a top view of two other exemplary embodiments of a guiding means; Figures 3A-3C illustrate top views of other exemplary embodiments of a moving means of a luminaire system; Figures 4A-4B illustrate cross-sectional views of other exemplary embodiments of lens elements of a luminaire system; and Figure 5 illustrates a top view of another exemplary embodiment of a luminaire system.

DESCRIPTION OF THE FIGURES Figures 1A-1C respectively illustrate top views of an exemplary embodiment of a luminaire system.

The luminaire system 1 of Figures 1A-1C may be included in a luminaire head. The luminaire head may be connected in any manner known to the skilled person to a luminaire pole. Typical examples of such systems are street lights. In other embodiments, the luminaire head may be connected to a wall or a surface, e.g. for illuminating buildings or tunnels.

As illustrated in Figures 1A-1C, the luminaire system 1 comprises a first support 100, a second support 200, and a moving means 300. The first support 100 (arranged underneath the second support 200 in Figures 1A-1C such that only small portions thereof are visible in Figures 1A-1C) may be fixed in a luminaire head (not shown), and comprises a first surface (not shown), a second surface (not shown) opposite said first surface, and a peripheral edge 103 between the first surface and the second surface. A plurality of light sources 110 may be arranged on one of the first support 100 and the second support 200, and is configured to emit light through one or more optical elements 250 associated with the plurality of light sources 110 and arranged on the other one of the first support 100 and the second support 200.

In the exemplary embodiment of Figures 1A-1C, the first support 100 comprises a plurality of light sources 110 mounted on the first surface. The first support 100 may comprise a supporting substrate, e.g. a PCB, and a heat sink (not shown) onto which the supporting substrate may be mounted. A luminaire housing (not shown) may be arranged around the first support 100 and may comprise a planar surface onto which the first support 100 is provided. The plurality of light sources 110 comprises a plurality of LEDs. Further, each light source 110 may comprise a plurality of LEDs, more particularly a multi-chip of LEDs. In the embodiment of Figures 1A-1C, theplurality of light sources 110 corresponds to 24 light sources 110 arranged in a two-dimensional array of six rows R and four columns C.

In other embodiments, the plurality of light sources 110 may be arranged without a determined pattern, or in an array with at least two rows R of light sources 110 and at least two columns C of light sources 110. It should be clear for the skilled person that the number of rows R and columns C may vary from one embodiment to another.

The LEDs may be disposed on the PCB and mounted on top of a planar surface of the heat sink made of a thermally conductive material, e.g. aluminium.

The surface onto which the plurality of light sources 110 is mounted on may be made reflective or white to improve the light emission.

The plurality of light sources 110 could also be light sources other than LEDs, e.g. halogen, incandescent, or fluorescent lamp.

In the exemplary embodiment of Figures 1A-1C, the second support 200 comprises one or more optical elements 250 associated with the plurality of light sources 110. The one or more optical elements 250 correspond to 24 optical elements 250 arranged in a two-dimensional array of six rows R and four columns C associated with the plurality of light sources 110. In other embodiments, the one or more optical elements 250 may be arranged without a determined pattern or in an array with at least two rows R of optical elements 250 and at least two columns C of optical elements 250. It should be clear for the skilled person that the number of rows R and columns C may vary from one embodiment to another.

In other embodiments, some of the plurality of light sources 110 may not be associated with an optical element 250. In the embodiment of Figures 1A-1C, each optical element of the 24 optical elements 250 extends over one corresponding light source of the 24 light sources 110, and the optical elements 250 are similar in size and shape.

In another exemplary embodiment, at least one optical element 250 may not extend over a corresponding light source of the plurality of light sources 110. In another exemplary embodiment, some or all of the optical elements 250 may be different from each other.

In a further exemplary embodiment, there are more optical elements 250 than light sources 110. In yet other embodiments there may be provided a plurality of LEDs below each or some of the optical elements 250. In the exemplary embodiment of Figures 1A-1C, the second support 200 is movable with respect to the first support 100. It should be clear for the skilled person that in other exemplary embodiments the second support 200 may comprise a plurality of light sources 110, and that the first support 100 may comprise one or more optical elements 250 associated with the plurality of light sources 110. In these embodiments, the first support 100 may be fixed, and the second support 200 is movable with respect to the first support 100. Hence, the configuration of the first support 100 and of the second support 200 is interchangeable in the present invention.

The one or more optical elements 250 may be part of an integrally formed optical plate comprised in the second support 200, as illustrated in Figures 1A-IC.

In other words, the one or more optical elements 250 may be interconnected so as to form an optical plate comprising the one or more optical elements 250. The optical plate may be formed, e.g. by injection moulding, casting, transfer moulding or in another appropriate manner.

Alternatively, the one or more optical elements 250 may be separately formed, e.g. by any one of the above mentioned techniques.

The second support 200 may comprise an optical plate integrating the one or more optical elements 250. The optical plate may be carried by a frame (not shown). The frame may be a rectangular plate with a first IO surface facing the plurality of light sources 110 and a second surface opposite the first surface.

The one or more optical elements 250 may comprise a plurality of lens elements associated with the plurality of light sources 110, as illustrated in Figures 1A-1C.

At least one lens element of the plurality of lens elements may have a first surface 251 and a second surface 252 located on opposite sides thereof.

The first surface 251 is a convex surface and the second surface 252 may be a concave surface, but may also be a planar surface, facing a light source of the plurality of light sources 110. Further, it should be clear for the skilled person that the one or more optical elements 250 may additionally or alternatively comprise other elements than lens elements, such as, reflectors, backlight elements, prismatic elements, collimators, diffusors, and the like.

At least one lens element of the plurality of lens elements may be free form in the sense that it is not rotation symmetric.

In the embodiment of Figures 1A-1C, the lens elements have a symmetry axis along an internal dimension D of the lens elements.

In another embodiment, the lens element may have no symmetry plane/axis at all.

The internal dimension D is defined as the dimension of the lens element on a side facing the plurality of light sources 110 along a movement direction of the second support 200, as described in a later paragraph.

Optical elements 250 such as lenses and collimators may possess an internal dimension D as defined above.

The plurality of lens elements may have a maximum length different from a maximum width.

Said length may be defined as an internal dimension on a side facing the plurality of light sources 110 seen in the movement direction of the second support 200, and said width may be defined as an internal dimension on a side facing the plurality of light sources 110 seen perpendicularly to the movement direction of the second support 200. The lens elements are in a transparent or translucent material.

They may be in optical grade silicone, glass, poly(methyl methacrylate) (PMMA), polycarbonate (PC), or polyethylene terephthalate (PET). The light distribution adaptability of the luminaire system 1 is made easier by the common movement of the plurality of light sources 110 or of the one or more optical elements 250 ratherthan on an individual basis. At the same time, embodiments of the invention reduce the number of parts to be kept in stock for maintenance. In other embodiments, changing the position of the plurality of light sources 110 or of the one or more optical elements 250 may be done to compensate for mounting or apparatus inaccuracies.

As illustrated in Figures 1A-1C, the moving means 300 is configured to move the second support 200 relative to the first support 100, such that a position of the second support 200 with respect to the first support 100 is changed. In the embodiment of Figures 1A-1C, the second support 200 is arranged to move in contact with the first support 100. In other embodiments, the second support may be arranged to move at a fixed distance from the first support. In yet other embodiments, the second support may be arranged to move at a variable distance from the first support. The moving means 300 comprises an actuation element 310 configured to be moved along a first trajectory Al, and a conversion element 320 configured to convert the movement of the actuation element 310 into a movement of the second support 200 along a second trajectory A2 at an angle o to said first trajectory Al, such that said position of the second support 200 with respect to the first support 100 is changed. In the embodiment of Figures 1A-1C, the first trajectory Al and the second trajectory A2 are substantially parallel to the first support 100. The first trajectory Al corresponds to a straight line along an axis Al substantially parallel to the first support 100. The second trajectory A2 corresponds to a straight line along an axis A2 substantially parallel to the first support 100. In other embodiments, the first trajectory A1 may correspond to a curved line substantially parallel to the first support 100, and/or the second trajectory A2 may correspond to a curved line substantially parallel to the first support 100. In yet other embodiments, the first trajectory Al may correspond to a straight line or a curved line in a direction substantially parallel to the first support 100, and/or the second trajectory A2 may correspond to a straight line or a curved line along a direction non- parallel to the first support 100, thereby enabling a movement of the second support 200 with respect to the first support 100 in three spatial dimensions, not only in a plane substantially parallel to the first support 100. For example, the second support 200 may be moved with respect to the first support 100 in a direction substantially perpendicular to the first support 100. In the embodiment of Figures 1A-1C, the first trajectory Al and the second trajectory A2 define a plane substantially parallel to the first support 100. The second support 200 is arranged substantially parallel to the first support 100, and the moving means 300 is configured to move the second support 200 substantially parallel to the first support 100. The angle a may be comprised between 60° and 120°. In the embodiment of Figures 1A-1C, said angle a is 90°, i.e. the second trajectory A2 is perpendicular to the first trajectory Al. It should be clear for the skilled person that in other embodiments the angle a may be different from 90°, i.e. that the second trajectory A2 may not be perpendicular to the first trajectory Al. Further, as illustrated in Figures 1A-1C the second support

200 may have a first side edge 210 parallel to the second trajectory A2, a second side edge 220 parallel to said second trajectory A2 and opposite said first side edge 210, a third side edge 230 parallel to said first trajectory A1, and a fourth side edge 240 oppostte said third side edge 230.

The conversion element 320 may be coupled to or integrated with the second support 200, such that the conversion element 320 is in a fixed position with respect to the second support 200. As illustrated in Figures 1A-1C, the conversion element 320 has a contact surface 321 at an angle B with respect to the first trajectory Al. Said contact surface 321 is in contact with the actuation element 310. Said angle [3 may be smaller than 90°, preferably smaller than 60°. Preferably, the contact surface 321 is oriented perpendicular to the first support 100. The actuation element 310 comprises an edge portion 311 configured to be moved along the contact surface 321. Said edge portion 311 may have a surface area which is at least ten times smaller than the surface area of the contact surface 321. The luminaire system 1 may further comprise a guiding track 312. The actuation element 310 may be configured to be moved along the guiding track 312. Said guiding track 312 may be fixed in the luminaire system 1. In Figure 1A, the edge portion 311 of the actuation element 310 is, in a first position, in contact with a first portion of the contact surface

321. The second support 200 is in a first position with respect to the first support 100. In Figure 1B, the edge portion 311 is moved in contact with the contact surface 321 along the guiding track 312 in the direction of the first trajectory A1, from said first position to a second position where the edge portion 311 is in contact with a second portion of the contact surface 321. The conversion element 320 converts the movement of the edge portion 311 into a movement of the second support 200 along the second trajectory A2, such that said first position of the second support 200 with respect to the first support 100 is changed to a second position. In Figure 1C, the edge portion 311 is further moved in contact with the contact surface 321 along the guiding track 312 in the direction of the first trajectory Al, from said second position to a third position where the edge portion 311 is in contact with a third portion of the contact surface 321. The conversion element 320 converts the movement of the edge portion 311 into a movement of the second support 200 along the second trajectory A2, such that said second position of the second support 200 with respect to the first support 100 is changed to a third position.

In the embodiment of Figures 1 A-1C, the conversion element 320 is a separate element fixed to the second support 200. In other embodiments, the conversion element 320 may be integrally formed with the second support 200. The luminaire system 1 may further comprise a luminaire housing (not shown). The actuation element 310 may be arranged in said luminaire housing. The actuation element 310 may comprise a ferromagnetic material arranged such that the actuation element 310 can be moved by means of a magnet element (not shown) arranged outside the luminaire housing.

Said ferromagnetic material may be arranged in or on the actuation element 310, or may be fixed on the actuation element 310 and may protrude outside the actuation element 310 to create a lever arm.

In this way, a user may move the actuation element 310 from outside the luminaire housing using the magnet clement.

Alternatively, the actuation element 310 may comprise a magnet element arranged such that the actuation element 310 can be moved by means of a ferromagnetic material arranged outside the luminaire housing.

It should be clear for the skilled person that other configurations and arrangements of the actuation element 310 and the conversion element 320) may be possible, such as the one illustrated in Figures 2A-2B.

Figures 2A-2B respectively illustrate a top view of an exemplary embodiment of a moving means of a luminaire system, and a top view of another exemplary embodiment of a luminaire system.

As illustrated in Figures 2A-2B, the moving means 300 comprises an actuation element 310 configured to be moved along a first trajectory Al, and a conversion element 320 configured to convert the movement of the actuation element 310 into a movement of the second support 200 (not shown in Figure 2A) along a second trajectory A2 at an angle o to said first trajectory Al, such that said position of the second support 200 with respect to the first support 100 is changed.

In the embodiment of Figures 2A-2B, the first trajectory Al and the second trajectory A2 are substantially parallel to the first support 100 (not shown in Figure 2A). The first trajectory Al corresponds to a straight line along an axis Al substantially parallel to the first support 100. The second trajectory A2 corresponds to a straight line along an axis A2 substantially parallel to the first support 100. In other embodiments, the first trajectory Al may correspond to a curved line substantially parallel to the first support 100, and/or the second trajectory A2 may correspond to a curved line substantially parallel to the first support 100. In yet other embodiments, the first trajectory Al may correspond to a straight line or a curved line in a direction substantially parallel to the first support 100, and/or the second trajectory A2 may correspond to a straight line or a curved line along a direction non-parallel to the first support 100, thereby enabling a movement of the second support 200 with respect to the first support 100 in three spatial dimensions, not only in a plane substantially parallel to the first support 100. For example, the second support 200 may be moved with respect to the first support 100 in a direction substantially perpendicular to the first support 100. In the embodiment of Figures 2A-2B, the first trajectory Al and the second trajectory A2 define a plane substantially parallel to the first support 100. The second support 200 is arranged substantially parallel to the first support 100, and the moving means 300 is configured to move the second support 200 substantially parallel to the first support 100. The angle a may be comprised between 60° and 120°. In the embodiment of Figures 2A-2B, said angle a is 90°, i.e. the second trajectory A2 is perpendicular to the first trajectory Al.

It should be clear for the skilled person thatin other embodiments the angle a may be different from 90°, i.e. that the second trajectory A2 may not be perpendicular to the first trajectory Al. The conversion element 320 has a contact surface 321 at an angle DB with respect to the first trajectory Al. Said angle B may be smaller than 90°, preferably smaller than 60°. Preferably, the contact surface 321 is oriented perpendicular to the first support 100. Said contact surface 321 is in contact with the actuation element 310. In contrast to the embodiment of Figures 1A-1C where the actuation element 310 comprises an edge portion 311, the actuation element 310 of the embodiment illustrated in Figure 2A comprises a matching surface 311° configured to be moved in contact with the contact surface 321 along the first trajectory Al. In order to match the contact surface 321 of the conversion element 320, at least a portion of the matching surface 311° of the actuation element 310 may be at said angle PD with respect to the first trajectory Al, i.e. may be parallel to the contact surface 321. In the embodiment of Figure 2A, the total matching surface 311’ is parallel to the contact surface 321.

Figures 3A-3C illustrate top views of other exemplary embodiments of a moving means of a luminaire system. As illustrated in Figures 3A-3C, the moving means 300 comprises an actuation element 310 configured to be moved along a first trajectory Al, and a conversion element 320 configured to convert the movement of the actuation element 310 into a movement of the second support (not shown) along a second trajectory A2 at an angle o to said first trajectory Al, such that said position of the second support 200 with respect to the first support 100 is changed. In the embodiments of Figures 3A-3C, the first trajectory Al and the second trajectory A2 are substantially parallel to the first support (not shown). The first trajectory Al corresponds to a straight line along an axis Al substantially parallel to the first support. The second trajectory A2 corresponds to a straight line along an axis A2 substantially parallel to the first support. In other embodiments, the first trajectory Al may correspond to a curved line substantially parallel to the first support, and/or the second trajectory A2 may correspond to a curved line substantially parallel to the first support. In yet other embodiments, the first trajectory Al may correspond to a straight line or a curved line in a direction substantially parallel to the first support, and/or the second trajectory A2 may correspond to a straight line or a curved line along a direction non-parallel to the first support, thereby enabling a movement of the second support with respect to the first support in three spatial dimensions, not only in a plane substantially parallel to the first support. For example, the second support may be moved with respect to the first support in a direction substantially perpendicular to the first support. In the embodiments of Figures 3A-3C, the first trajectory Al and the second trajectory A2 define a plane substantially parallel to the first support. The angle a may be comprised between 60° and 120°. In the embodiment of Figures 3A-3C, said angle o is 90°, i.e.

the second trajectory A2 is perpendicular to the first trajectory Al. It should be clear for the skilled person that in other embodiments the angle a may be different from 90°, i.e. that the second trajectory A2 may not be perpendicular to the first trajectory Al.

As illustrated in Figure 3A, the actuation element 310 comprises an edge portion 311 configured to be moved along a contact surface 321 of the conversion element 320. The actuation element 310 is configured to be moved along a guiding track 312 fixed in the luminaire system 1. The contact surface 321 is divided into four first contact surface portions 321a at an angle 1 of 0° with respect to the first trajectory Al, i.e. parallel to the first trajectory Al, and three second contact surface portions 321b at an angle B2 with respect to the first trajectory Al. The division of the contact surface 321 into first and second contact surface portions 3214, 321b enables to obtain four discrete positions P1-P4 of the second support with respect to the first support (not shown). Preferably, the angle B2 is smaller than 90°, in order to avoid that the three second contact surface portions 321b become abutment surfaces for the edge portion 311, thereby avoiding that the second support be blocked in one of the four discrete positions P1-P4, e.g. the first position P1. In an alternative embodiment, the actuation element 310 may comprise a matching surface 311° configured to be moved in contact with the contact surface 321 along the first trajectory Al. In order to match the first and second contact surface portions 321a, 321b, the matching surface 311° may be divided into four first matching surface portions 311°a at said angle 31 of 0° with respect to the first trajectory Al, i.e. parallel to the four first contact surface portions 321a, and three second matching surface portions 321°b at an angle 2 with respect to the first trajectory Al, i.e. parallel to the three second contact surface portions 321b.

As illustrated in Figures 3B-3C, the actuation element 310 comprises an edge portion 311 configured to be moved along a contact surface 321 of the conversion element 320. The actuation element 310 is configured to be moved along a guiding track 312 fixed in the luminaire system 1. The contact surface 321 is at a varying angle [B with respect to the first trajectory Al, i.e. the contact surface 321 is curved. Said varying angle B may be smaller than 90°, preferably smaller than 60°. In Figure 3B the contact surface 321 is convex, whereas in Figure 3C the contact surface 321 is concave. In both cases, the angle [} may be defined as the angle between a tangent of said curved contact surface and the first trajectory Al. In an alternative embodiment, the actuation element 310 may comprise a matching surface 311° configured to be moved in contact with the contact surface 321 along the first trajectory Al. In order to match the curved contact surface 321, the matching surface 311° may be curved at said varying angles [B with respect to the first trajectory Al, i.e. tangents of the curved matching surface 311° may be parallel to corresponding tangents of the curved contact surface 321.

As illustrated in Figure 2B, the lominaire system | comprises a first support 100, a second support 200, and a moving means 300 as described in Figure 2A. The first support 100 (arranged underneath the second support 200, and represented by dashed-dotted lines in Figure 2B) may be fixed in a luminaire head (not shown), and comprises a first surface (not shown), a second surface (not shown) opposite said first surface, and a peripheral edge 103 between the first surface and the second surface. A plurality of light sources (not shown) is arranged on the first support 100, and is configured to emit light through one or more optical elements (not shown) associated with the plurality of light sources and arranged on the second support 200. The actuation element 310 is IO configured to be moved along a guiding track 312 fixed in the luminaire system 1. In the embodiment of Figure 2B, the conversion element 320 is integrally formed with the second support

200. As in Figures 1A-1C, the luminaire system 1 may further comprise a laminaire housing {not shown). The actuation element 310 may be arranged in said luminaire housing. The actuation element 310 may comprise a ferromagnetic material arranged such that the actuation element 310 can be moved by means of a magnet element (not shown) arranged outside the laminaire housing. Alternatively, the actuation element 310 may comprise a magnet element arranged such that the actuation element 310 can be moved by means of a ferromagnetic material arranged outside the luminaire housing.

As illustrated in Figure 2B, the laminaire system 1 may further comprise a guiding means 500 configured to guide the movement of the second support 200 with respect to the first support 100 along the second trajectory A2. The guiding means 500 may comprise a first sliding guide 510 and a second sliding guide 520 at opposite side edges of the second support 200. Further, the second support 200 may have a first side edge 210 parallel to the second trajectory A2, and a second side edge 220 parallel to said second trajectory A2 and opposite said first side edge 210. The first sliding guide 510 may be arranged at said first side edge 210, and the second sliding guide 520 may be arranged at said second side edge 220. Moreover, the first sliding guide 510 may be connected to the second support 200, and may be in contact with the peripheral edge 103 of the first support 100. Similarly, the second sliding guide 520 may be connected to the second support 200, and may be in contact with the peripheral edge 103 of the first support 100. In another embodiment, the sliding guides 510, 520 may be arranged on the first support 100. In the embodiment of Figure 2B, the guiding means 500 comprises a pair of first sliding guides 510 arranged at said first side edge 210, and a pair of second sliding guides 520 arranged at said second side edge 220 opposite the first side edge 210. These two pairs of sliding guides 510, 520, or even the guiding means 500 as a whole, may be integrally formed with the second support 200, as illustrated in the embodiment of Figure 2B {represented by dotted lines). In this case, the guidingmeans 500 may be in optical grade silicone, glass, poly(methyl methacrylate) (PMMA), polycarbonate (PC), or polyethylene terephthalate (PET), so does the one more optical elements that may be part of an integrally formed optical plate comprised in the second support 200. It should be clear for the skilled person that in other embodiments the sliding guides may be simply fixed to the second support 200. In the embodiment of Figure 2B, a plurality of elongated slits 530 may be arranged in the second support 200. The guiding means 500 may comprise guiding elements 540 extending through said elongated slits 530 and fixed to the first support 100. Said guiding elements 540 may comprise for example screws and the like fixed to the first support 100. Said guiding elements may also be used to fix the first support 100 to a luminaire head (not shown). Said guiding elements 540 may also act as mechanical stops in the movement of the second support 200, since the plurality of elongated slits 530 will abut against them at two edges along the second trajectory A2. In the embodiment of Figure 2B, there are provided five guiding elements 540, each extending through one elongated slit

530. In other embodiments, more or less than five guiding elements 540 may be provided, but preferably at least two guiding elements 540. Similarly, at least two sliding guides 510, 520 may be preferably provided in other embodiments. It is worthwhile to mention that both types of guiding means, i.e. sliding guides and elongated slits/guiding elements may be provided individually or simultaneously in one exemplary embodiment, provided that the compatibility between them is assured, thereby avoiding any risk of malfunctioning. Figures 2C-2D respectively illustrate a top view of two other exemplary embodiments of a guiding means 500. As illustrated in Figure 2C, the angle a is lower than 90°, i.e. the second trajectory A2 is not perpendicular to the first trajectory Al. The guiding means 500 may then comprise an elongated slit 530 arranged in the second support 200 along the second trajectory A2, and a guiding element 540 extending through said elongated slit 530 and fixed to the first support (not shown, underneath the second support 200). As illustrated in Figure 2D, the second trajectory A2 is such that the angle al is equal to 90°, i.e. a first portion of the second trajectory A2 is perpendicular to the first trajectory Al, and that the angle a2 is lower than 90°, i.e. a second portion of the second trajectory A2 is not perpendicular to the first trajectory Al. The guiding means 500 may then comprise an elongated slit 530 arranged in the second support 200 along the second trajectory A2, said second trajectory A2 comprising the above-mentioned first and second portions, and a guiding element 540 extending through said elongated slit 530 and fixed to the first support (not shown, underneath the second support 200). As illustrated in Figure 2B, the second support 200 has a third side edge 230 at an angle a to said first trajectory Al, and a fourth side edge 240 opposite said third side edge 230. The luminaire system 1 may further comprise a spring element 400 configured to exert a restoring force on thesecond support 200, along the second trajectory A2. The moving means 300 may be coupled to the third side edge 230 of the second support 200. As the conversion element 320 is integrally formed with the second support 200 in the embodiment of Figure 2B, the conversion element 320 is itself arranged at said third side edge 230. The spring element 400 may be configured to exert a restoring force on the fourth side edge 240 of the second support 200. It should be clear for the skilled person that in other embodiments the spring element 400 may be arranged at said third side edge

230. The luminaire system 1 may further comprise an abutment surface 2 at a fixed position in the luminaire system 1. Said fixed position is preferably substantially perpendicular to said second trajectory A2. The spring element 400 may comprise at least one connection portion 410 connected to the second support 200, and at least one contact portion 420 connected to said at least one connection portion 410 and in contact with said abutment surface 2. In other embodiments, e.g. in an embodiment where the spring element 400 is arranged at said third side edge 230, the at least one contact portion 420 may be in contact with the peripheral edge 103 of the first support 100. The at least one contact portion 420 of the spring element 400 may comprise at least two contact parts 4224, 422b in contact with said abutment surface 2, or with said peripheral edge 103. In the embodiment of Figure 2B, there is provided one connection portion 410 arranged at said fourth side edge 240, and one contact portion 420 connected to the connection portion 410. The contact portion 420 comprises two legs 4214, 421b terminated by two contact parts 4224, 422b in contact with the abutment surface 2. The two contact parts 4224, 422b of the contact portion 420 are located at opposite sides of the connection portion 410. Moreover, the spring element 400 may be integrally formed with the second support 200. In this case, the spring element 400 may be in optical grade silicone, glass, poly(methyl methacrylate) (PMMA), polycarbonate (PC), or polyethylene terephthalate (PET), so does the one more optical elements 250 that may be part of an integrally formed optical plate comprised in the second support 200. In other embodiments, the at least one connection portion 410 of the spring element 400 may be simply fixed to the second support 200. In an embodiment where the contact portion 420 is in contact with the peripheral edge 103 of the first support 100, a distance between said two contact parts 4224, 422b may be higher than 10% of a width W of the first support 100 and/or of the second support 200, preferably higher than 20% of said width W, more preferably higher than 30% of said width W. This distance is defined when the spring element is at rest, i.e. not submitted by any force arising from the movement of the second support 200 relative to the first support 100, During said movement, the distance between said two contact parts 4224, 422b will vary. In the embodiment of Figure 2B, the distance will increase during a movement of the second support 200 in a direction along the trajectory Al from the third side edge 230 to the fourth side edge 240.

In other embodiments than those illustrated in Figures 1A-1C and Figures 2A-2B, such as the embodiment of Figure 5, there may be provided a moving means 300 comprising a first moving means 300’ as described in Figures 1A-1C or in Figures 2A-2B, and a second moving means 300". The first moving means 300° may comprise a first actuation element 310° configured to be moved along the first trajectory Al, and a first conversion element 320’ configured to convert the movement of the first actuation element 310’ into a movement of the second support 200 along the second trajectory A2. The second moving means 300°" may comprise a second actuation element 310” configured to be moved along a third trajectory A3, and a second conversion element 320” configured to convert the movement of the second actuation element 310°" into a movement of the second support 200 along a fourth trajectory A4 at an angle o to said third trajectory A3. The first moving means 300’ may be coupled to said third side edge 230 as illustrated in Figure 5, and the second moving means 300° may be coupled to said first side edge 210, or to said second side edge 220 as illustrated in Figure 5. As for the first moving means 300’, the actuation element 3107’ of the second moving means 300°’ may comprise an edge portion as described in Figures {A-1C, or a matching surface as described in Figures 2A-2B and Figure 5. Hence, in these embodiments, such as the embodiment of Figure 5, the second support 200 may be moved relative to the first support 100 along a combination of the second trajectory A2 and the fourth trajectory A4. Preferably, the first and third trajectories Al, A3 respectively correspond to a straight line along a second axis A2 as illustrated in Figures 1A-1C, Figures 2A-2B, and Figure 5, and to a straight line along a fourth axis A4 as illustrated in Figure 5, both axes A2, A4 being substantially parallel to the first support

100. Preferably, the second and fourth trajectories A2, A4 respectively correspond to straight lines along two axes substantially parallel to the first support 100. Alternatively, one of these trajectories, or both of them, may also correspond to a curved line substantially parallel to the first support 100. Further, as illustrated in Figure 5 the second support 200 may have a first side edge 210 parallel to the second trajectory A2, a second side edge 220 at an angle o’ to said second trajectory A2 and opposite said first side edge 210, a third side edge 230 at an angle a to said first trajectory Al, and a fourth side edge 240 opposite said third side edge 230. In these embodiments, such as the embodiment of Figure 5, the guiding means preferably comprises a plurality of slits (not shown) arranged in the second support 200. For example, said slits may correspond to square slits, or star/cross-shaped slits, instead of the elongated slits 530 illustrated in Figure 2B. A square or star/cross shape of the slits enables a movement of the second support 200 along a combination of the above-mentioned second and fourth trajectories A2, Ad. For example, the second support 200 may then be moved in a plane formed by said second and fourth trajectories A2, A4, said plane being substantially parallel to the first support 100. The guiding means may further comprise guiding elements (not shown) extending through saidpreferably square or star/cross-shaped slits and fixed to the first support 100. Said guiding elements may comprise for example screws and the like fixed to the first support 100. Said guiding elements may also act as mechanical stops in the movement of the second support 200, since the plurality of square or star/cross-shaped slits will abut against them at four edges along the combined trajectory substantially parallel to the first support 100. As illustrated in Figure 5, the luminaire system 1 may further comprise a first spring element 400° configured to exert a restoring force on the second support 200 along the second trajectory A2, and a second spring element 400°" configured to exert a restoring force on the second support 200 along the fourth trajectory A4. The resulting restoring force may be exerted along a combination of the second trajectory A2 and of the fourth trajectory A4. The first spring element 400’ may be configured to exert a restoring force on said third or fourth side edge 240, and the second spring element 400°" may be configured to exert a restoring force on said first or second side edge 210, or vice versa.

The first and second spring elements 400°, 400°" may also be configured to act as a {5 guiding means.

The luminaire system 1 of Figures 1A-1C or Figure 2B may further comprise a controlling means {not shown) configured to control the moving means 300, such that the position of the second support 200 with respect to the first support 100 is controlled.

Preferably, the controlling means may be configured to control the moving means 300 to position the second support 200 in a plurality of positions resulting in a plurality of lighting patterns on a surface, said plurality of lighting patterns having a plurality of different illuminated surface areas.

Further, an optical element of the one or more optical elements 250 may have an internal dimension D along the second trajectory A2, and the controlling means may be configured to control the moving means 300 such that the second support 200 is moved relative to the first support 100 over a distance below 90% of said internal dimension D of the optical element, preferably below 50% of the internal dimension D of the optical element.

Optical elements 250 such as lenses and collimators may possess an internal dimension D as defined above.

Changing the light distribution may be done at the factory and/or during installation as well as during occasional or everyday usage of the luminaire system 1. The luminaire system 1 of Figures 1A-1C or Figure 2B may further comprise a light driver (not shown) configured to drive the plurality of light sources 110. The light driver may be provided in or on a luminaire head, or in or on a luminaire pole, and more generally anywhere in a luminaire comprising a luminaire head with a luminaire housing and optionally a luminaire pole.

As an option, there may be a light dimmer configured to control the light driver to drive one or more ofthe plurality of light sources 110 at a dimmed intensity. The light driver and the light dimmer may be integrated in a single driver component. The light driver may also be controlled by the controlling means, or by an independent controlling means. If the same controlling means is used for controlling the light driver and the moving means 300, instructions to the controlling means, for example the position of the second support 200 with respect to the first support 100 and/or the dimming profile of the light sources 110 and/or a light colour and/or a light pattern and/or a flashing pattern and/or a light colour temperature, may be given by a user or a remote device (not shown, may be located in another huminaire) via a wireless network, e.g. Bluetooth, Wifi, Zigbee, LORA (IoT), IR, or via a wired network, e.g. Ethernet, DALI, DMX, RS485, USB. A sensor (not shown) may be located on the moving means 300, or on the first support 100, or on the second support 200, so as to determine the position of the second support 200 with respect to the first support 100. A feedback loop may allow a more precise positioning of the plurality of optical elements 250 respective to the plurality of light sources 110, or vice versa, by controlling the moving means 300 based on data continuously or regularly supplied by the sensor. The edge portion 311 as described in Figures 1A-1C, or the matching surface 311° as described in Figures 2A-2B, of the actuation element 310 may be rotated manually by a user, or may be rotated automatically by an actuator driver (not shown) driving the actuation element 310. The light driver and the actuator driver may be controlled by a common controlling means, e.g. the controlling means, or by an independent controlling means. Optionally, the light driver and the actuator driver may be integrated in a single driver component. In some embodiments, the light driver and the actuator driver may correspond to the same driver. Figures 4A-4B illustrate cross-sectional views of other exemplary embodiments of lens elements of a luminaire system.

In the exemplary embodiments of Figures 4A-4B, the plurality of light sources 110, in the illustrated embodiments LEDs 110, is mounted on a PCB and the plurality of lens elements 250 is integrated in a lens plate. The lens plate is in contact with the PCB. Each of the plurality of lens elements 250 has a first surface 251 and a second surface 252 facing the plurality of light sources 110 opposite of the first surface 251. The first surface 251 is a convex surface and the second surface 252 is a concave surface. Each lens element of the plurality of lens elements 250 has a varying profile along an internal dimension D in the moving direction of the second support 200, i.e. along the second trajectory A2. The profile variation may be a shape variation along the internal dimension D of the lens element 250, a thickness variation between the first surface 251 and the second surface 252, and/or a variation of transparency and/or diffusivity and/or reflectivity and/or refractivity. In the embodiments of Figures 4A-4B, the second trajectory A2 corresponds toa straight line along an axis A2 substantially parallel to the first support 100. Alternatively or additionally, the second trajectory A2 may correspond to a curved line substantially parallel to the first support 100. In yet other embodiments, the second trajectory A2 may correspond to a straight line or a curved line along a direction non-parallel to the first support 100, thereby enabling a movement of the second support 200 with respect to the first support 100 in three spatial dimensions, not only in a plane substantially parallel to the first support 100. For example, the second support 200 may be moved with respect to the first support 100 in a direction substantially perpendicular to the first support 100.

IO In the exemplary embodiment of Figure 4A, the luminaire system comprises a second support 200 comprising a plurality of light sources 110, and a first support 100 comprising a plurality of lens elements 250 associated with the plurality of light sources 110. The first support 100 may be fixed, and the second support 200 is movable with respect to the first support 100 along a second trajectory A2 substantially parallel to the first support 100. A lens element of the plurality of lens elements 250 has a symmetry axis in the movement direction of the second support 200 along the second trajectory A2. The lens element 250 has a profile varying in thickness seen in the movement direction of the second support 200. The varying profile presents an asymmetric shape with respect to a centre plane perpendicular to the movement direction of the second support 200. Moving the lens plate to position the plurality of lens elements 250 in a plurality of positions will result in a plurality of lighting patterns on a surface, said plurality of lighting patterns having a plurality of different illuminated surface areas.

In the exemplary embodiment of Figure 4B, the luminaire system comprises a first support 100 comprising a plurality of light sources 110, and a second support 200 comprising a plurality of lens elements 250 associated with the plurality of light sources 110. The first support 100 may be fixed, and the second support 200 is movable with respect to the first support 100 along a second trajectory A2 substantially parallel to the first support 100. A lens element of the plurality of lens elements 250 has a first profile part 250a and a second profile part 250b adjoined in a discontinuous manner. In other words, the first profile part 2504 and the second profile part 250b are connected through a connecting surface or line 250c comprising a saddle point 253 or discontinuity. The first profile part 250a presents a shape and a thickness variation along its length. The second profile part 250b presents a bell shape and a constant thickness along its length. Moving the plurality of light sources 110 such that the plurality of light sources 110 corresponds to the first profile part 250a or the second profile part 250b may further modify the lighting pattern obtained from the luminaire system. In the illustrated embodiment of Figure 4B, the internal dimension D is defined as the added dimensions of the first and second profile part 250a, 250b on aside facing the plurality of light sources 110 along the movement direction of the second support

200. The second support 200 is movably arranged relative to the first support 100 to position the light sources 110 either in a first position facing the first profile part 250a or in a second position facing the second profile part 250b. Preferably, each lens element 250 has a circumferential edge in contact with the first support 100, and the connecting surface or line 250c is at a distance of the first support 100. Preferably, the first profile part 250a is at a first maximal distance of the first support 100, the second profile part 250b is at a second maximal distance of the first support 100, and the saddle point or discontinuity 253 is at a third distance of the first support 100, said third distance being lower than said first and second distance. More preferably, the first and second maximal distances are different. The luminaire system may be included in a luminaire head (not shown) having a fixation end configured for being attached to a pole (not shown). The first maximal distance defined above is larger than the second maximal distance defined above, and the lens element 250 is arranged such that the second profile part 250b is closer to the fixation end of the luminaire head than the first profile part 250a. Whilst the principles of the invention have been set out above in connection with specific embodiments, it is to be understood that this description is merely made by way of example and not as a limitation of the scope of protection which is determined by the appended claims.

Claims (37)

Conclusions i. Light fixture system (1) comprising: a first bracket (100); a second support (200) movable with respect to the first support (100); a movement means (300) arranged to move the second support (200) relative to the first support (100) such that a position of the second support (200) relative to the first support (100) is changed ; wherein the movement means (300) comprises: an actuating element (310) arranged to be moved along a first path (A1); and a converting element (320) configured to convert the movement of the actuating element (310) into movement of the second support (200) along a second path (A2) at an angle α with respect to the first path. (Already); wherein a plurality of light sources (110) are disposed on one of the first support (100) and the second support (200), and are arranged to emit light through one or more optical elements (250) associated with the multiple light sources (110) and mounted on the other of the first support (100) and the second support (200). The light fitting system of claim 1, wherein the first support (100) comprises the plurality of Light sources (110); and wherein the second support (200) includes the one or more optical elements (250). The light fitting system of claim 1 or 2, wherein the one or more optical elements (250) comprise a plurality of lens elements associated with the plurality of light sources (110). Light fixture system according to any one of the preceding claims, wherein the first path (A1) and the second path (A2) are substantially parallel to the first support (100). A light fitting system according to any of the preceding claims, wherein the conversion element (320) is in a fixed position with respect to the second support (200). A light fitting system according to any one of the preceding claims, wherein the conversion element (320) is coupled to the second support (200). The light fitting system of any of the preceding claims, wherein the conversion element (320) is integrally formed with the second support (200). Light fitting system according to any one of the preceding claims, wherein the angle α is between 60 ° and 120 °. Light fitting system according to any of the preceding claims, wherein the second path (A2) is substantially perpendicular to the first path (A1). A light fitting system according to any one of the preceding claims, wherein the conversion element (320) has a contact surface (321) that is oriented at an angle B to the first path (A1), the contact surface (321) being in contact with the actuating element (310); wherein the angle fs is less than 90 °, preferably less than 60 °. The light fitting system of claim 10, wherein the actuating element (310) includes an edge portion (311) adapted to be moved along the contact surface (321). A light fitting system according to any of the preceding claims, further comprising a guide track (312) mounted in the light fitting system (1); and wherein the actuation element (310) is arranged to be moved along the guide track (312). A light fixture system according to any preceding claim, further comprising a light fixture housing, wherein the actuating element (310) is disposed in the light fixture housing and comprises a ferromagnetic material or a magnetic element disposed such that the actuating element (310) can move. by means of a magnetic element or a ferromagnetic material arranged outside the light fixture housing. A light fitting system according to any of the preceding claims, wherein the second support (200) is arranged substantially parallel to the first support (100); and wherein the movement means (300) is arranged to move the second support (200) substantially parallel to the first support (100). A light fitting system according to any one of the preceding claims, further comprising: a guide means (500) arranged to guide the movement of the second support (200) relative to the first support (100) along the second path (A2). The light fitting system of claim 15, wherein the guide means (500) comprises a first slide guide (510) and a second slide guide (520) on opposite side edges of the first or second support (200). A light fitting system according to claim 16, wherein the first or second support has a first side edge parallel to the second track (A2), a second side edge parallel or at an angle to the second track (A2) and opposite the first side edge, a third side edge parallel or at an angle to the first track (A1), and has a fourth side edge opposite the third side edge; and wherein the first slide guide (510) is disposed on the first side edge (210) and the second slide guide (520) is disposed on the second side edge (220). A light fitting system according to claim 16 or 17, wherein the first sliding guide (510) is connected to the first or second bracket and is in contact with a peripheral edge of the second or first bracket; and wherein the second slide guide (520) is respectively connected to the first or second support and in contact with the peripheral edge of the second or first support. The light fitting system of any of claims 15-18, wherein the guide means (500) is integrally formed with the first or second support. A light fitting system according to any of claims 15-19, wherein a plurality of elongated slots (530) are provided in the first or second support; and wherein the guiding means (500) comprises guiding elements (540) extending through the elongated slots (530) and attached to the second or first support and / or to another component of the light fitting system (1). A light fitting system according to any one of the preceding claims, wherein the movement means (300) comprises a first movement means (300 °) and a second movement means (3007); wherein the first movement means (300 °) comprises: a first actuation element (3107) arranged to be moved along the first path (A1); and a first converting element (320 °) configured to convert the movement of the first actuating element (310 °) into movement of the second support (200) along the second path (A2); and wherein the second movement means (3007) comprises: a second actuation element (3107) arranged to be moved along a third path (A3); and a second converting element (3207) configured to convert the movement of the second actuating element (3107) into movement of the second support (200) along a fourth path (A4) at an angle α 'to the third lane (A3). The light arm system of claim 21, wherein the third track (A3) is substantially parallel to the second track (A2); and wherein the fourth track (A4) is substantially parallel to the first track (A1). The light armature system of claim 21 or 22, wherein the first movement means (300 °) is coupled to the third side edge (230); and wherein the second movement means (300) is coupled to the first side edge (210) or to the second side edge (220). The light armature system of any of claims 21 to 23, further comprising guiding means adapted to guide movement of the second support (200) relative to the first support (100) along a combination of the second path (A2) and the fourth lane (A4). A light fitting system according to any one of the preceding claims, further comprising a spring element (400) adapted to exert a restoring force on the second support (200), in the direction of the second path (A2). A light fitting system according to claim 25, further comprising a stop face (2) at a fixed position in the light fitting system (1); and wherein the spring member (400) has at least one connecting portion (410) connected to the second support (200), and at least one contact portion (420) connecting to the at least one connecting portion (410) and in contact with comprises the stop face (2). The light fitting system of claim 26, wherein the at least one contact portion (420) of the spring element (400) includes at least two contact points (4224, 422b) in contact with the abutment face (2). The light fixture system of any of claims 25-27, wherein the second support (200) has a first side edge (210) parallel to the second track (A2), a second side edge (220) parallel or at an angle to the second track ( A2) and opposite the first side edge (210), has a third side edge (230) parallel or at an angle to the first track (A1), and a fourth side edge (240) opposite the third side edge (230); wherein the conversion element (320) is coupled to the third side edge (230): and wherein the spring element (400) is arranged to apply a restoring force to the fourth side edge (240). The light fitting system of any of claims 25-28, wherein the spring element (400) is integrally formed with the second bracket (200). A light fitting system according to any one of the preceding claims, further comprising: a control means arranged to control the movement means (300) such that the position of the second support (200) relative to the first support (100) is controlled. A light fixture system according to claim 30, wherein the control means is arranged to control the movement means (300) to position the second support (200) in multiple positions relative to the first support (100) resulting in multiple light patterns on a surface, wherein the multiple Light patterns have multiple different illuminated surface areas. The light fitting system of claim 30 or 31, wherein an optical element of the one or more optical elements (250) has an internal dimension (D) along the second path (A2); and wherein the control means is arranged to control the movement means (300) such that the second support (200) is moved! relative to the first support (100) by a distance less than 90% of the internal dimension (D) of the optical element, preferably less than 50% of the internal dimension (D) of the optical element. A light fitting system according to any preceding claim, wherein the second support (200) and the first support (100) are arranged such that an optical element of the one or more optical elements (250) extends over a corresponding light source of the plurality of light sources. (110). A light fitting system according to claim 1 or 2, optionally in combination with any of the preceding claims, wherein the first support (100) or the second support (200) comprises an optical plate that integrates the one or more optical elements (250). The light fitting system of claim 3, optionally in combination with any of the preceding claims, wherein a lens element of the plurality of lens elements has a first surface (251) and a second surface (252) located on either side thereof, the first surface (251) is a convex or planar surface and the second surface (252) is a concave or planar surface that faces a light source from the plurality of light sources (110). A light fitting system according to any one of the preceding claims, wherein the light sources (110) are arranged in a two-dimensional array of at least two rows (R) and at least two columns (C). The light fitting system of any preceding claim, further comprising: a light driver configured to drive the plurality of light sources (110).