Lighting device for a target, with absorbed emission spectrum

Abstract

TARGET LIGHTING DEVICE WITH ABSORBED EMISSION SPECTRUM The invention relates to a target lighting device comprising: - a support (2) having a target reception surface, the support including a target illumination zone (210), the support and / or at least the illumination zone of the support being of a determined color characterized by a determined absorption spectrum; - a frame (3) comprising a light group formed by a plurality of light sources. According to the invention, each light source emits a light spectrum, called the emission spectrum, chosen primarily from the determined absorption spectrum. Figure to be published: 2

Description

Title of the invention: Lighting device for a target, with absorbed emission spectrum. Field of the invention

[0001] The field of the invention is that of lighting in general and that of target lighting devices.

[0002] More specifically, the invention relates to a device for lighting and highlighting a target.

[0003] The invention finds particular application in the scenographic lighting of jewelry. State of the art

[0004] It is known to create jewelry stands equipped with lighting means.

[0005] For example, US document 6,433,483 shows jewelry lighting devices comprising a housing for receiving a piece of jewelry, and lighting means having a plurality of light sources.

[0006] The light sources are positioned in contact with the jewelry so that the light emitted by the sources is directed towards the exposed jewelry support. Thus, the jewelry is illuminated. When the jewelry includes a stone or gem, or a transparent or translucent element, the light passes through the translucent element. This has the effect of illuminating the display area of ​​the jewelry within the device, generating uncontrolled and unsightly shadows.

[0007] Objectives of the invention

[0008] The invention therefore aims in particular to overcome the disadvantages of the prior art mentioned above.

[0009] More specifically, the invention aims to provide a lighting device for a target, such as a piece of jewelry, which highlights the illuminated target or object.

[0010] An objective of the invention is also to provide such a technique which avoids the presence of unsightly and / or uncontrolled shadows.

[0011] Another objective of the invention is to provide such a technique which limits or eliminates differences in light exposure from the background to the back of the illuminated object.

[0012] Another objective of the invention is to provide such a technique which is simple to implement, and of limited cost.

[0013] An objective of the invention is also to propose such a technique which does not or has little impact on the size compared to a conventional lighting device.

[0014] Another objective of the invention is to provide such a technique which is reliable and safe for the observer of the illuminated object. Description of the invention

[0015] These objectives, as well as others that will appear subsequently, are achieved using a target illumination device, comprising: - a support presenting a reception surface for the target to be illuminated, the support including an illumination zone for the target, the support and / or at least the illumination zone of the support being of a determined color characterized by a determined absorption spectrum; - an armature comprising a luminous group formed from a plurality of light sources.

[0016] According to the invention, each light source emits a light spectrum, called emission spectrum, chosen mainly from the determined absorption spectrum.

[0017] Thus, in a novel way, the invention proposes to implement lighting in which the emission spectrum is absorbed by the determined color of the illuminated area. Thanks to these characteristics, the illumination conditions highlight the target to be lit, without creating a visible halo of light on the surface.

[0018] According to particular embodiments of the invention, the target lighting device, which is the subject of the invention, comprises one or more of the following characteristics, according to any operational technical combination.

[0019] Furthermore, according to a particular embodiment of the invention, the frame is intended to be positioned, at least in part, at a distance from the support.

[0020] Furthermore, according to an advantageous embodiment of the invention, the light group is mainly located in a portion of the armature distant from said support.

[0021] According to a particularly advantageous embodiment of the invention, the light spectrum of each light source is exclusively chosen from the spectrum absorbed by the support in the illumination zone.

[0022] According to a preferred embodiment of the invention, the determined color is uniform.

[0023] According to a particular embodiment of the invention, the light spectrum is further chosen according to the material and / or the surface condition, and / or the texture, and / or the shape of the illumination zone.

[0024] Thus, the various parameters involved in the visual perception of the viewer observing the target, the jewel, the work of art, etc., are taken into account to optimize the lighting and therefore improve the staging. For example, the material determined, that is to say, chosen, the background is taken into account when it impacts the absorption of the light received.

[0025] According to an advantageous embodiment of the invention, the portion of the reinforcement intended to be positioned, at least in part, at a distance from the support is mainly positioned above said support.

[0026] Thanks to these technical characteristics, the luminous efficiency of the lighting is improved.

[0027] According to a particularly advantageous embodiment of the invention, the light group is located substantially elevated relative to said support

[0028] Thanks to these technical characteristics, the luminous efficiency of the lighting is optimized.

[0029] According to a preferred embodiment of the invention, the lighting device comprises a control unit coupled to each of the light sources, the control unit being parameterized to configure each light source so as to emit the chosen light spectrum.

[0030] Thus, the control of each light source is mastered.

[0031] Furthermore, according to a particularly advantageous embodiment of the invention, the control unit is parameterized to turn on at least one of the light sources at a determined frequency, and, simultaneously, keep at least one of the light sources off, the at least one of the light sources turned on being different from the at least one of the light sources kept off.

[0032] Thanks to these technical characteristics, the lighting device highlights the target, making it appear animated and giving the impression that it is "alive". For example, when the target is a piece of jewelry set with stones, particularly faceted stones such as a cut diamond, the stones sparkle brilliantly.

[0033] According to an advantageous embodiment of the invention, the plurality of light sources forming the light group is arranged in a linear pattern.

[0034] According to a particular embodiment of the invention, the plurality of light sources forming the light group is arranged according to a matrix scheme.

[0035] According to a particular embodiment of the invention, the plurality of light sources is distributed in a repeated pattern forming the light group.

[0036] According to an advantageous embodiment of the invention, at least one of the light sources is formed from a composition of several radiation sources the addition of which produces a colored light or a substantially white light.

[0037] According to a particular embodiment of the invention, each light source is formed of an RGB LED.

[0038] Thus, with a trichromatic source, it is possible to configure the emission spectrum. It is then simply a matter of choosing the specific color of the illumination zone in depending on its absorption spectrum and the emission spectrum of the light sources so that the emitted light is absorbed by the illumination area.

[0039] According to a particular embodiment of the invention, the chosen light spectrum is obtained using a filter placed in front of each light source.

[0040] Thanks to these technical characteristics, it is possible to produce a lighting device according to the invention at a reduced cost.

[0041] According to a particularly advantageous embodiment of the invention, the lighting device includes a color characterization sensor determined so as to adapt the emission light spectrum.

[0042] Thus, thanks to these technical characteristics, the lighting device is able to adapt the emission spectrum of the lighting to produce a luminous flux absorbed by the background. To do this, the information provided by the sensor can be used directly by the control unit, or it may require the latter to perform a conversion, for example using a nomogram or a formula, before reconfiguring the light sources. When a color temperature is measured in kelvin, a nomogram allows the corresponding absorption spectrum to be obtained. The sensor can, for example, be a colorimeter, a spectrophotometer, a hyperspectral imaging device, a CCD sensor, or a photographic sensor equipped with a spectral filter.

[0043] According to a particularly advantageous embodiment of the invention, the lighting device further comprises a brightness sensor and / or a temperature sensor, of the ambient light in which the lighting device is used, so as to adapt the chosen light spectrum to the ambient light conditions.

[0044] Thus, thanks to these technical characteristics, the lighting system is able to adapt the illumination of the target, particularly according to ambient light conditions. It is then possible to maintain a constant display, for example, or one that can be configured according to the desired display design. For example, in a jeweler's street-facing window during the winter months, the brightness changes throughout the day. It is therefore possible to adjust the lighting conditions to maintain the appeal of the displayed jewelry regardless of the time of day. For example, at the end of the day, it is possible to make the lighting warmer. Conversely, in the display design of a window located inside the jewelry store, in an environment of artificial ambient lighting, which is often controlled, the behavior of the lighting system can be configured differently. Figures

[0045] Other features and advantages of the invention will become clearer upon reading the following description of three particular embodiments of the invention, given by way of simple illustrative and non-limiting example, and the accompanying drawings, among which: • [Fig.1] [Fig.1] is a schematic perspective representation of a first embodiment of a lighting device according to the invention; • [Fig.2] [Fig.2] is a schematic perspective representation of a second embodiment of a lighting device according to the invention, in the form of a display case; • [Fig.3] [Fig.3] is a schematic representation of a box integrating a lighting device according to the invention; • [Fig.4] [Fig.4] is a graphical representation of the time evolution of a luminous intensity emitted by the luminous group of the lighting device according to the invention.

[0046] Only the elements necessary for understanding the invention have been shown. To facilitate reading the drawings, the same elements bear the same reference numerals from one figure to another. Detailed description of the invention

[0047] Reference will now be made in detail to specific implementations illustrated in the attached drawings and figures.

[0048] In the following detailed description, many specific details are presented to provide a thorough understanding of the invention.

[0049] However, it will be clear to a person skilled in the art that implementations can be put into practice without these specific details.

[0050] In other cases, well-known processes, procedures, components, circuits and networks have not been described in detail so as not to unnecessarily obscure aspects of the implementations.

[0051] Example of an embodiment of the invention

[0052] With [Fig.1], we have illustrated a device 1 for lighting a target 1000, according to the invention, which is now described.

[0053] According to the embodiments detailed below, the target represented is a jewel 1000. However, this target could be a work of art, any object or even a person.

[0054] As can be seen, the lighting device 1 consists of a support 2 which has a receiving surface 21 for the target 1000 to be illuminated. The receiving surface 21 includes an illumination zone 210 in which the target, i.e., the piece of jewelry 1000 to be illuminated, is placed. It is perfectly clear within the scope of the invention that the illumination zone 210 can cover all or part of the receiving surface 21, and / or the support 2.

[0055] The lighting device 1 also includes an armature 3 intended to be positioned, at least in part, above the support 2. In other words, the support overhangs at least partially the support 2.

[0056] To illuminate the target 1000, the armature 3 is equipped with at least one light group 4 consisting of a plurality of light sources 41. This plurality includes at least two light sources spaced apart. The group thus formed is arranged substantially in elevation above the support 2. According to a preferred embodiment, the light group 4 overhangs, at least partially, the illumination zone 210.

[0057] According to the invention, on the one hand, the illuminated area 210 is of a specific color. The specific color, in other words, the color chosen according to the desired scenography for highlighting the target 1000, is characterized by an absorption spectrum. This will be called the specific absorption spectrum, in reference to the chosen or specific color. Furthermore, the illuminated area 210 is also called the background 210 of the device 1, and the specific color of the background is called the background color.

[0058] On the other hand, at least one of the light sources 41 emits a light spectrum chosen to correspond with the determined color of the illumination zone 210. Preferably, each light source 41 emits an identical or substantially identical light spectrum. The emitted light spectrum of each light source is mainly located in the absorption spectrum, or absorbed spectrum, which characterizes the determined color used for the illumination zone 210. Thus, the spectral radiations emitted by each light source are absorbed by the background 210. That is to say, the wavelengths present in the emission spectrum are also present in the absorption spectrum. In other words, the color of the emitted light is the same hue as the color of the background 210, which means that it will be absorbed by it.

[0059] To illustrate, by choosing a red background color, each light source 41 is chosen so as to emit in the same wavelength range. Typically, the electromagnetic radiation corresponding to the color red covers the wavelength range between 620 and 780 nm.

[0060] In contrast, if the emitted light came from light sources whose spectral lines were chosen to emit on a different range from red, for example, green or blue, the emitted light would then be reflected by the background 210. As a result, a spot of this light would be visible on the background 210.

[0061] For the record, the color blue corresponds to electromagnetic radiation approximately in the range between 470 and 485 nm and the color green corresponds to electromagnetic radiation located approximately between 485 and 555 nm.

[0062] It will therefore be understood that, according to the invention, the light emitted by the plurality of light sources 41 of the lighting device 1 does not illuminate the illumination zone 210. Consequently, on the one hand, the beam of light from each light source 41 is not visible on the surface of the illumination zone 210 or background 210. On the other hand, the beam or cone of light from each light source 41 does not create a shadow phenomenon of the target, here the jewel, on this same illumination zone 210. Conversely, under the effect of standard lighting, for example that of white light with a continuous emission spectrum, that is to say with a wide range of wavelengths, from the ultraviolet wavelength to the infrared wavelength, the shadow of the target is visible on the illuminated background.

[0063] This means that for the lighting device 1, the background color 210 is closely linked, i.e., matched, to the emitted light spectrum of each light source, and vice versa. Therefore, choosing one parameter implies choosing the other of the two parameters forming a pair (background color; emitted light spectrum). For simplicity, the background color 210, also called the determined color, is uniform. Furthermore, the material, texture, surface finish, relief, and shape of the background 210 are parameters which, considered individually or collectively, can affect the absorption of the light emitted by each light source 41. Consequently, when one of these parameters affects the final result, it is taken into account along with the background color 210 and the emitted light spectrum to avoid the appearance of a halo of light on the background 210.

[0064] To complete the lighting device 1, it also includes a control unit 5 powered by a rechargeable energy storage unit or battery 6. The battery 6 thus provides the autonomy of the electronic assembly of the lighting device 1. The control unit 5 is also connected directly or indirectly to each light source 4L

[0065] Thus, the lighting device 1 is able, with the help of its unit 5, to control or command each light source 41 of the light group 4. The control unit 5, connected to each of the light sources, is parameterized to configure each light source 41 so as to emit the chosen light spectrum.

[0066] The operating modes of the control unit 5 will be detailed with the description of [Fig.3].

[0067] Other examples of embodiments of the invention

[0068] In [Fig. 2], a second embodiment represents a portion of a display case 70 with the support platform 2 forming the surface for a work of art 1954. This display case, illustrating the lighting device 1, highlights the work of art 1954, placed in the illuminated area 210. As in the previous embodiment, the display case 70 includes the frame 3 supporting the ceiling or canopy 71. As can be seen As shown in [Fig. 2], the ceiling 71 supports the light group 4. Furthermore, in this case, the ceiling 71 overhangs the receiving surface 21 on one side and is parallel to the receiving surface 21 on the other. In this embodiment, the light group 4 has an annular shape. Thus, the plurality of light sources 41 are arranged in a circle so as to present the same angle with respect to the illumination zone 210. Moreover, the normal distance between each light source 41 and the receiving surface 21 is substantially the same.

[0069] It should be understood that the relationship between the emission spectrum of each light source 41 and the background color 210, of this second embodiment, is identical to the first embodiment.

[0070] Furthermore, it is understood that showcase 70 is equipped with the same means to activate the light group 4 so as to illuminate the artwork 1954.

[0071] With reference to [Fig.3], a third embodiment is shown, in which the device is integrated into a box 10 comprising a housing 11 and a cover 12 for closing the housing 11. In this embodiment, the armature 3 is then integrated into the cover 12. As a result, the armature 3 is orientable with respect to the support and therefore the illumination area 210.

[0072] More specifically, the receiving surface 21 of the support 2, and therefore the area to be illuminated 210, is formed by the bottom of the box 11. The cover 12 is therefore movable relative to the box 11 and allows the armature 3 to be positioned in elevation relative to the area to be illuminated 210, when the box 10 is in a plane substantially close to the horizontal.

[0073] The cover 12 has an internal face 121 intended to come against the box 11 in a closed position of the box 11 by the cover 12.

[0074] The cover also has a rim 122 surrounding the inner face 121.

[0075] The light group 4 is housed in the rim 122.

[0076] The border 122 has a ledge 123 from which extends a rush 124 whose role is specified in the rest of the description.

[0077] In [Fig. 2], it can be seen that the light group 4 comprises a plurality of light sources 4L

[0078] The light sources 41 are, for example, light-emitting diodes (known by the English acronym "LED"). For example, the light sources 41 are formed from a composition of several elementary sources of radiation, the combination of which produces colored light or substantially white light. In other words, it is the mixture of the radiation from several elementary sources that produces the light emitted by each light source 41. A light source 41 is, for example, composed of the elementary sources red, green, and blue. However, each light source 41 is not limited to this example of composition and may, depending on the needs, it can be bichromatic, trichromatic (such as the mixture of red, green, blue), tetrachromatic (such as the mixture of the colors red, yellow, green, blue) or more.

[0079] As the control unit 5 is parameterized to configure each light source 41 so as to emit the chosen light spectrum, the control unit 5 is able to define and / or fix the configuration of each light source 41 according to the characteristics of the light source 41 previously mentioned (bichromatic, trichromatic, tetrachromatic source, etc.).

[0080] Common to each embodiment, the luminous group 4 also includes: • a heat sink; • for each light source 41, optionally focusing means or a lens; • means of thermal conduction, and • a support or substrate, such as an electronic board on which the light sources are fixed.

[0081] The various constituent elements of the light group 4 are positioned as follows.

[0082] The electronic board is attached to the heat sink by one side and to each of the collimators or each of the lenses by a second side carrying the light sources 4L

[0083] The thermal conduction means take the form of a thermally conductive film located between the electronic board and the heat sink. Advantageously, the thermally conductive film is flexible to allow for malleability, enabling it to deform and conform to the shape of a receptacle in which the light group 4 is housed. This avoids, or at least minimizes, the presence of air bubbles that would have an insulating effect, hindering thermal conduction and thus impeding the desired heat dissipation.

[0084] The control unit 5 is coupled to each of the light sources 4L

[0085] In addition to managing a mode of simultaneous illumination of all the light sources 41, the control unit 5 is configured to turn on, at a predetermined frequency, at least one of the light sources 41 and, simultaneously, keep at least one of the light sources 4L off

[0086] Of course, the light source 41 which is on is different from the light source 41 which is off.

[0087] Furthermore, the control unit 5 is parameterized to apply a light intensity setpoint Ti to each light source 41, so that at any given time, "JY _ jj", where N is the number of light sources 41 switched on, and Tt is a The desired total lighting intensity. More precisely, Tt is the total luminous intensity received by the area to be illuminated.

[0088] With reference to [Fig.4], this means that the desired total lighting intensity is distributed according to the number N of light sources 41 lit at any given time.

[0089] In other words, the sum at each instant of the light intensity emitted by each light source 41 is equal to the desired total lighting intensity Tt which remains constant over time T.

[0090] In the example of [Fig. 4], the light intensity setpoints Ti of two light sources 41 are shown. The graph in [Fig. 4] corresponds to the intensity for each light source 41 (ordinate axis) as a function of time (abscissa axis).

[0091] A first light intensity setpoint Til of one of the light sources 41 and a second light intensity setpoint Ti2 of another of the light sources 41 are shown.

[0092] As time T progresses, the first light intensity setpoint Til decreases, and the second light intensity setpoint Ti2 increases.

[0093] It is then observed that for each instant on the time line T, the sum of the first light intensity setpoint Til and the second light intensity setpoint Ti2 is constant and corresponds to the desired total lighting intensity Tt.

[0094] Figure 4 illustrates the light intensity settings Ti of two light sources 41; however, the formula "_ y 'v jy" is true for a number N of light sources 41 greater than two.

[0095] As illustrated by [Fig.4], the switching on and off of the light sources 41 is carried out in a gradual manner.

[0096] This makes it possible to maintain the desired total lighting intensity Tt constant and to avoid any risk of lighting failure since there is an overlap of the lighting from at least two light sources 41.

[0097] Furthermore, maintaining a constant total desired illumination intensity Tt creates the impression of natural flickering. In addition, the perceived illumination of the background 210 is not affected by variations in the number of illuminated light sources 41, since the emission spectrum of the light sources 41 lies entirely within the absorption spectrum of the background 210. At the very least, when the emission spectrum is only partially within the absorption spectrum, the light spot effect, while not completely imperceptible to the eye, is greatly reduced, and there is no difference in the illumination of the receiving surface 21 depending on the number of light sources 41 illuminated simultaneously. The natural effect is further enhanced when there is no light spot and therefore no variation in the light spot. around the jewel 1000 depending on the origin of the light radiation. In other words, the illumination of the area to be lit 210, and therefore the luminous spot, when visible, is stable and does not appear to dance on the receiving surface 21 during the periodic, pseudo-random, or random change of the illuminated light sources 41. Furthermore, it is specified that the luminous intensity, expressed in cd, concerns the light source 41, while the illuminance, expressed in lux, concerns the object illuminated by the light sources 41.

[0098] In addition, thanks to the gradual switching on and off of the light sources 41, it is possible to make the sparkle of the jewel 1000 more natural.

[0099] According to a first embodiment, the control unit 5 is configured to turn on each light source 41 according to a periodic pattern.

[0100] According to a second embodiment, the control unit 5 is configured to turn on each light source 41 according to a random, or almost random, pattern.

[0101] The transition from a periodic scheme to a random scheme, or vice versa, can be achieved by ad hoc control means.

[0102] The control means may, for example, take the form of a selector integrated into the lighting device 1, or a computer application installed on a portable electronic device. In the latter case, the control unit 5 is then capable of communicating with the computer application embedded on the electronic device. In other words, the lighting device 1 includes first means of communication, used by the control unit 5, capable of communicating with second means of communication of the portable electronic device.

[0103] According to a third embodiment, the control unit 5 is configured such that the desired total illumination intensity Tt is less than a constant limit value that allows the target to be illuminated without leaving a visible light area on the receiving surface 21. In other words, when the target is illuminated, the receiving surface 21 is not illuminated. Thus, in this embodiment, although this desired total illumination intensity Tt remains the sum of the light intensity setpoints Ti of the illuminated light sources 41 as before, the desired total illumination intensity Tt can vary between zero and the constant limit value to ensure a flickering effect. This embodiment is typically implemented if the emitted light spectrum of each light source is not entirely or mainly located within the absorption spectrum of the background 210.

[0104] With reference to Figures 1 to 3, the light sources 41 are arranged in a line. The line may be straight, as in the first and third embodiments (illustrated respectively by Figures 1 and 3), or it may have one or more radii of curvature as in the second embodiment (illustrated by the [Fig.2]) in which the armature 3 is in the form of a ring. However, a matrix arrangement or scheme, a disk, or any other composition of the aforementioned arrangements of the light sources 41 falls within the scope of the invention.

[0105] In fact, when a fixed light source 41 is located above a piece of jewelry and emits light radiation directed towards it, each of the facets of the jewelry reflects the light in a direction.

[0106] A stationary observer located nearby can then see some facets of the jewel light up when the light reflected by one of the facets is directed towards the observer's eye and reaches his eye.

[0107] If the observer, the jewel and the light source remain fixed, then the jewel does not sparkle.

[0108] On the other hand, when a relative displacement exists between the observer and the jewel, or between the jewel and the light source, then the rays reflected by each of the facets of the jewel are sent back in different directions, which causes a scintillating effect of the jewel when one of the facets intermittently reflects the radiation towards the eye of the observer.

[0109] The lighting device 1 described above makes it possible to create a sparkling effect on the target, in this case the jewel 1000, through relative movement between the light group 4 and the jewel 1000. When highlighting a target, whether an object or a person, the reflection of the light rays off different facets of the target causes the sparkling effect. For example, if a person is wearing clothing adorned with rhinestones or sequins, this effect can be further enhanced.

[0110] More specifically, the relative movement between the light group 4 and the target, here the jewel 1000, is obtained while the light group 4 is stationary relative to the jewel 1000.

[0111] Indeed, to allow the movement of the light source, the light group 4 is provided with a plurality of light sources 41 as explained above.

[0112] As previously described, the control of the light sources 41, i.e. their switching on and off, is carried out by the control unit 5.

[0113] More specifically, the control unit 5 controls the switching on of each light source 41, according to a predetermined, pseudo-random or random frequency.

[0114] The predetermined frequency corresponds to an ephemeral, or even fleeting, ignition, that is to say over a very short period.

[0115] When at least one of the light sources is on, at least one of the light sources 41 is off.

[0116] Thus, by varying the lighting of each light source, the control unit allows a movement of displacement of the light radiation directed towards the jewel 1000, while the light group 4 remains stationary.

[0117] This then causes the jewel 1000 to sparkle since its different facets are lit discontinuously, randomly or predeterminedly.

[0118] Thus, for an observer who remains fixed with respect to the jewel, the different light rays reflected by the different facets of the jewel 1000 reach the observer's eye only discontinuously, which causes the scintillation effect.

[0119] The use of a periodic scheme by the control unit 5 to control the lighting of the light sources 41 makes it possible to create a repetitive scintillation pattern of the jewel to highlight it in a particular way, for example by emphasizing one area more than another.

[0120] Thus, in the case of a jewel 1000 in the form of a necklace, as illustrated by [Fig.1], the scintillation can be made along the jewel 1000 from a first end to a second end in a first direction and then in a second direction, that is to say in the form of a back and forth.

[0121] On the other hand, when the control unit 5 uses a random pattern, then the sparkle of the jewel 1000 is in a disordered manner, similar to a natural sparkle of the jewel 1000. The random pattern will be advantageously defined so that it does not repeat itself during the same use.

[0122] Other optional features and advantages of the invention

[0123] It is understood that, within the scope of the invention, the light emission spectrum, or emission spectrum, is either a discontinuous spectrum or line spectrum, or a continuous spectrum. When the emission spectrum is a continuous spectrum, it is typically a continuous portion of the absorption spectrum and, consequently, a continuous portion of the visible light spectrum. While the emission spectrum is typically emitted by polychromatic sources, it can very well also be the result of using monochromatic sources, judiciously combined with the background 210.

[0124] In variations of the embodiments of the invention detailed above, it may also be provided that: - to replace a light group with a single light source; - that the light group, or plurality of light source can also be implemented using COB LEDs (English acronym for "Chip-on-Board"), or COB LED strips; - that the light source(s) can be a point source; - that the light source(s) can be orthotropic, also known under the name of Lambertian source, or isotropic; - for each light group an interface module connected to each light source and connected via a bus to the control unit; - a light sensor and / or a temperature sensor, of the ambient light in which the lighting device is used, the sensor(s) being connected to the control unit 5 which is configured to adapt the chosen light spectrum to the ambient light conditions, or in other words the control unit 5 being able to define the configuration of each source according to the ambient light conditions; - the chosen light spectrum is obtained using a filter placed in front of each light source; - one or more handles on the case, allowing a user to grasp the box for easy transport. Thus, the case can very well be used as luggage, for example a suitcase or briefcase.

[0125] It should be understood that the elements shown in the figures can be implemented in various forms of hardware, software, or combinations thereof. Preferably, these elements are implemented in a combination of hardware and software on one or more appropriately programmed multipurpose devices, which may include a processor, memory, and input / output interfaces.

[0126] The present description illustrates the principles of this disclosure. It will therefore be appreciated if persons skilled in the art will be able to devise various arrangements which, although not explicitly described or shown here, embody the principles of the disclosure and are included within its scope.

[0127] Thus, according to the principle of the invention, it must be understood that the idea is to avoid the presence of a luminous halo and / or shadow cast by the target on the support in order to highlight the target, under the effect of lighting perceived as magical, beyond the examples previously described.

[0128] All examples and conditional language cited herein are intended for educational purposes to assist the reader in understanding the principles of disclosure and the concepts introduced by the inventor to advance the art, and should be interpreted as not being limited to those specifically cited examples and conditions.

[0129] Furthermore, all statements of principles, aspects, and implementation methods of disclosure, as well as specific examples thereof, are intended to encompass their structural and functional equivalents. Moreover, it is intended that these equivalents will include both currently known equivalents and equivalents developed in the future—that is, any developed element that performs the same function, regardless of its structure.

[0130] Thus, for example, those skilled in the art will understand that the schematic diagrams presented here represent conceptual views of illustrative circuits implementing the principles of disclosure. Similarly, it will be appreciated that all the flowcharts, diagrams, and other diagrams represent various processes that can essentially be represented on a computer-readable medium and thus executed by a computer or processor, whether or not that computer or processor is explicitly shown.

[0131] Insofar as embodiments of the invention have been described as being implemented, at least in part, by a software-controlled data processing device, it will be understood that a machine-readable non-transient medium carrying such software, such as an optical disc, a magnetic disc, a semiconductor memory or the like, is also considered to represent an embodiment of the present invention.

[0132] The functions of the various elements illustrated in the figures can be performed using dedicated hardware as well as hardware capable of running software in conjunction with suitable software. When performed by a processor, the functions can be performed by a single dedicated processor, a single shared processor, or a plurality of individual processors, some of which may be shared. Furthermore, the explicit use of the term "processor" or "controller" should not be interpreted as referring exclusively to hardware capable of running software, and may implicitly include, without limitation, a digital signal processor (DSP), read-only memory (ROM) for storing the software, random-access memory (RAM), and non-volatile storage media.In addition, some elements can be independent or grouped together, for example in a microcontroller (MCU), or a system-on-a-chip (SoC).

[0133] Other hardware, conventional and / or custom, may also be included. Similarly, all switches shown in the figures are purely conceptual. Their function may be performed by the operation of program logic, by dedicated logic, by the interaction of a program control and dedicated logic, or even manually, the particular technique being selectable by the operator as more specifically understood in the context.

[0134] In the claims of this document, any element expressed as a means of performing a specified function is intended to encompass any way of performing that function, including, for example, a) a combination of circuit elements that performs that function or b) software in any form, including, therefore, firmware, microcode or the like, combined to suitable circuits to run this software in order to perform the function. The disclosure as defined by such claims lies in the fact that the functionalities provided by the various means cited are combined and brought together in the manner envisaged by the claims. It is therefore considered that all means that can provide these functionalities are equivalent to those presented herein.

Claims

Demands

1. Device (1) for illuminating a target, comprising: - a support (2) having a receiving surface (21) of the target to be illuminated, the support including an area (210) of illumination of the target, the support and / or at least the area of ​​illumination of the support being of a determined color characterized by a determined absorption spectrum; - an armature (3) comprising a light group (4) formed of a plurality of light sources (41), characterized in that each light source emits a light spectrum, called emission spectrum, chosen, principally, from the determined absorption spectrum.

2. Lighting device according to claim 1, characterized in that the light spectrum of each light source is exclusively chosen from the spectrum absorbed by the support in the illumination zone.

3. Lighting device according to any one of the preceding claims, characterized in that the determined color is uniform.

4. Lighting device according to any one of the preceding claims, characterized in that the light spectrum is further selected according to the material and / or surface condition, and / or texture, and / or shape of the illumination area.

5. Lighting device according to any one of the preceding claims, characterized in that the portion of the armature (3) intended to be positioned, at least in part, at a distance from the support (2) is principally positioned above said support.

6. Lighting device according to any one of the preceding claims, characterized in that the light group is located substantially in elevation with respect to said support (2).

7. Lighting device (1) according to any one of the preceding claims, characterized in that it comprises a control unit (5) coupled to each of the light sources, the control unit being parameterized to configure each light source (41) so as to emit the selected light spectrum.

8. Lighting device (1) according to the preceding claim, characterized in that the control unit (5) is parameterized to switch on at least one of the sources at a predetermined frequency luminous (41), and, simultaneously, keep at least one of the luminous sources (41) off, at least one of the luminous sources (41) on being different from at least one of the luminous sources (41) kept off.

9. Lighting device according to any one of the preceding claims, characterized in that the plurality of light sources forming the light group (4) is arranged according to a matrix scheme.

10. Lighting device according to any one of claims 1 to 3, characterized in that the plurality of light sources forming the light group (4) is arranged in a linear pattern.

11. Lighting device (1) according to any one of the preceding claims, characterized in that at least one of the light sources (41) is formed of a composition of several radiation sources the addition of which produces colored light or substantially white light.

12. Lighting device (1) according to any one of the preceding claims, characterized in that the chosen light spectrum is obtained using a filter placed in front of each light source (41).

13. Lighting device according to any one of the preceding claims characterized in that it comprises a color characterization sensor determined so as to adapt the light emission spectrum.

14. Lighting device according to any one of the preceding claims, characterized in that it further comprises a brightness sensor and / or a temperature sensor, of the ambient light in which the lighting device is used, so as to adapt the chosen light spectrum to the ambient light conditions.

15. Lighting device (1) according to any one of the preceding claims, characterized in that each light source (41) is formed of an RGB LED.

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