FR3095493A1 - Lighting device - Google Patents

Abstract

Lighting device The invention relates to a lighting device comprising a light source (102) associated with a light guide. The light guide (101) is advantageously formed of a plate of a material suitable for the transmission of the light emitted by the light source (102). The light source (102) is arranged on all or part of an edge of the plate. The light guide (101) is configured such that at least part of the light transmitted in the light guide (101) is directed so as to illuminate a support (53) on which the illumination device is placed. , the material in which the light guide (101) is made being adapted to pass the light reflected by the support (53). Figure for the abstract: Figure 5

Description

Lighting device

The invention relates to a lighting device, in particular a portable lighting device for visually assisting a user for reading textual content and/or for obtaining a therapeutic effect on the user.

Technology background

Many scientific studies have highlighted the benefits of light on the human body, both psychologically and physiologically.

For example, Dr. Fritz Hollwich describes the effects of light on metabolism in his book “The influence of ocular light perception on metabolism in man and animal” (1979). More recently, physicist Anadi Martel published "The Power of Light" (2016) offering an overview of the latest research on light therapy and the many therapeutic applications that result from it. Other studies such as "Left-right asymmetry of the Maxwell spot centroids in adults without and with dyslexia" published by researchers A. Le Floch and G. Ropars offer a solution to at least partially remedy the problem of dyslexia by use of pulsed light with specific characteristics.

These studies have resulted in devices designed to treat certain pathologies or contribute to the well-being of the people using them. US patent 5,046,494 published on September 10, 1991, for example, proposes a device for exposing an individual to light with particular characteristics in order to obtain a therapeutic effect. These devices are most often complex, bulky, expensive and/or unsuitable for personal use.

An object of the present invention is to provide a lighting device that is easy to use and suitable for visually assisting a user, in particular when reading textual content.

The invention relates to a lighting device comprising a light source associated with a light guide, the light guide being formed of a plate of a material suitable for the transmission of the light emitted by the light source, the light source being arranged on at least part of an edge of the plate, the light guide being configured in such a way that at least part of the light transmitted in the light guide is directed so as to illuminate a support on which the lighting device is placed, the material being adapted to allow the light reflected by the support to pass.

According to a variant, the plate comprises a network of microstructures produced in the material to direct the at least part of said transmitted light into the light guide so as to illuminate the support.

According to an additional variant, the light source is arranged inclined with respect to the edge of the plate.

According to another variant, the light is modulated in pulse width according to a determined duty cycle and a determined frequency.

According to yet another variant, the determined duty cycle is included in an interval of values ranging from 17 to 35% and the determined frequency is included in an interval of values ranging from 75 to 85 Hz.

According to another variant, the determined duty cycle is included in an interval of values ranging from 1 to 100% and the determined frequency is included in an interval of values ranging from 1 to 30 Hz.

According to yet another variant, the light source comprises at least a first light-emitting diode emitting light in the visible spectrum and at least a second monochromatic amber light-emitting diode.

According to an additional variant, the light source comprises a plurality of groups of monochromatic light-emitting diodes, each group comprising at least one monochromatic light-emitting diode and emitting a different color among the following colors: indigo, blue, turquoise, green, yellow, red and ruby.

According to an additional variant, the lighting device comprises means for controlling the emission of light by at least part of the plurality of groups of monochromatic light-emitting diodes according to a determined time sequence.

According to yet another variant, the lighting device further comprises a man-machine interface for controlling at least one parameter of the light emitted by the light source.

Brief description of figures

Other characteristics and advantages of the invention will emerge from the description of the non-limiting embodiments of the invention below, with reference to the appended figures 1 to 4, in which:

schematically illustrates a lighting device, according to a particular embodiment of the present invention;

schematically illustrates a control signal for the light emitted by the lighting device of FIG. 1, according to a particular embodiment of the present invention;

schematically illustrates a control unit of the lighting device of FIG. 1, according to a particular embodiment of the present invention;

schematically illustrates an exploded view in perspective of part of the lighting device of FIG. 1, according to a particular embodiment of the present invention;

schematically illustrates the path followed by the light emitted by the lighting device of FIG. 1, according to a first particular embodiment of the present invention;

schematically illustrates the path followed by the light emitted by the lighting device of FIG. 1, according to a second particular embodiment of the present invention.

A lighting device will now be described in what follows with reference to FIGS. 1 to 6. The same elements are identified with the same reference signs throughout the description which follows.

According to a particular and non-limiting embodiment of the invention, the lighting device comprises a light source associated with a light guide. The light guide is advantageously formed from a plate of a material suitable for the transmission of the light emitted by the light source. The material corresponds for example to glass, polycarbonate or polymethyl methacrylate (PMMA). The light source is arranged on all or part of an edge of the plate. The light guide is configured in such a way that at least a part of the light transmitted in the light guide is directed so as to illuminate a support on which the lighting device is placed, the material in which the guide is made of light being adapted to allow the light reflected by the support to pass.

Such a device has the advantage of being able to be placed on any support to illuminate the latter. The material used for the light guide allows light to pass through, so it is possible for a user to read any content marked on the medium through the light guide, taking advantage of the benefits of the light transmitted in the light guide and reflected by the support.

schematically illustrates a lighting device 10, according to a particular and non-limiting embodiment of the present invention.

The lighting device 10 comprises 4 main parts: a first part corresponding to a light guide 101; a second part corresponding to a light source 102; a third part corresponding to a control unit 103 (also called control unit or piloting unit) configured to control the light emitted by the light source 102; and a fourth part corresponding to the frame 104 forming the frame of the lighting device 10 and holding the first, second and third parts together.

According to a variant embodiment, the lighting device comprises only the first part 101 and the second part 102 held together by the frame 104. According to this variant, the control unit 103 is remote from the lighting device 10 and connected to the light source 102 via a wired or wireless link.

The light guide 101 is composed of a transparent or semi-transparent material allowing the transmission of the light emitted by the light source 102. By way of example, the material corresponds to one of the following materials: glass, polycarbonate , PMMA (from English “poly(methyl methacrylate)” or in French “polyméthacrylate de méthyle”), acrylic resin, epoxy. The material forming the light guide 101 is characterized by several indices such as the light transmission index (also called light transmission rate) and/or the light absorption index (also called light absorption rate). light). By way of example, the material used to form the light guide will advantageously have a light transmission rate greater than 80%, advantageously greater than 90%. The light guide advantageously corresponds to a 3-dimensional plate whose shape and dimensions are arbitrary, advantageously of longitudinal shape and of dimensions suitable for the lighting device to be portable. The light guide 101 takes for example the form of a rectangular or square parallelepiped with a length for example equal to 10, 20 or 30 cm, a width equal to 5, 10 or 15 cm, and a thickness equal to 0.2, 0.5 or 1 cm. According to another example, the main plane of the light guide 101 takes the general shape of an ellipse or a rectangle with rounded corners.

According to a variant embodiment, the plate forming the light guide 101 comprises a network of microstructures provided to guide and direct the light transmitted in the light guide towards the bottom of the lighting device 10, that is to say towards a support on which the lighting device 10 is arranged. The microstructures have a determined pattern to direct the light downwards and are produced by laser engraving of the material. The microstructures correspond for example to grooves formed in the material with a diameter of a few microns to a few tens or hundreds of microns. According to another example, the microstructures correspond to discs or ellipses from a few microns to tens of microns in diameter. According to yet another example, the array of microstructures corresponds to a lenticular array.

The light source 102 is advantageously arranged on an edge or part of an edge of the light guide 101 so as to emit light in the light guide 101 tangentially. The light source is for example composed of a series of LEDs (from English “Light-Emitting Diode” or in French “diode electroluminescente”) or of a tube of the type fluorescent lamp with hot or cold cathode or neon tube . The light source 102 is arranged along a north or edge of the light guide to emit tangential light into the light guide 101.

The light emitted by the light source 102 is advantageously pulse-width modulated (PWM, from the English "Pulse Width Modulation") with a determined frequency and a duty cycle (from the English " duty cycle”) determined. One or more frequency values on the one hand and duty cycle on the other hand are for example set by default in the lighting device, it is up to the user to choose the frequency and duty cycle values that suit him. the best. According to a variant embodiment, the value of the frequency and/or the value of the duty cycle are adjustable by the user (for example via a man-machine interface) and can be chosen within determined intervals of values. . For example, the frequency can take any value between 1 Hz and 30 Hz and the duty cycle can take any value between 1% and 100%. According to another example, the frequency can take any value between 75 Hz and 85 Hz and the duty cycle can take any value between 17% and 35%. According to yet another particular embodiment, the frequency can take any value between 78 Hz and 100 Hz and the duty cycle can take any value between 15% and 50% or between 15% and 60%.

According to yet another example, the frequency advantageously takes one of the following values: 75 Hz, 80 Hz or 85 Hz. The duty cycle advantageously takes one of the following values: 25%, 30% or 35%.

The light source 102 also has a general color rendering index 'Ra', the index Ra being for example greater than 80, advantageously greater than 95.

An example of a pulse-width modulated light signal is described in more detail next to Figure 2.

The control unit 103 is configured to control or drive the light source 102. The control unit 103 comprises for example a battery 1031, rechargeable or not, to power the control unit and the light source 102. The control unit 103 also comprises an electronic card 1032 (for example of the integrated circuit type) carrying out the functions of charging the battery with control circuit in the event of a rechargeable battery, booster to raise the voltage required in order to powering the light source 102 and controlling the PWM modulation with one or more outputs. The control rules are for example implemented and controlled by a microprocessor embedded in the electronic card. One or more connectors (for example of the USB type (from the English "Universal Serial Bus" or in French "universal serial bus"), USB of type C or micro-USB and not represented in FIG. 1) are for example provided for recharging the battery or updating the software contained in a memory associated with the microprocessor of the electronic card. The control unit also includes a man-machine interface 1033 provided for a user to control one or more parameters of the light emitted by the light source, for example the frequency and/or the duty cycle. The human-machine interface takes the form, for example, of one or more buttons, potentiometers or a touch screen. The man-machine interface 1033 is for example also provided so that the user can choose the color (or the color temperature) of the light emitted by the light source 102 and/or choose a sequence of different colors emitted according to a determined or undetermined temporal order with a determined or chosen duration for each color of the color sequence.

According to a variant embodiment, the control unit 103 is not integrated into the lighting device but remote from the lighting device 10 and connected to the latter by a wired link (for example of the USB or Ethernet type) or without wire (for example of the Wi-Fi® or Bluetooth® type).

The control unit 103 can of course take other forms, for example as described with regard to FIG. 3.

The frame 104 forms the frame of the lighting device 10 and holds together the light guide 101, the light source 102 and the control unit 103. The shape of the frame is arbitrary, for example rectangle with rounded corners. The shape is for example chosen so that the lighting device is easily handled by a user. The frame is for example made with one or other of the following materials: aluminum, wood, composite material, plastic material or other. In addition to ensuring the maintenance of the different parts of the lighting device, the frame 104 ensures the protection of these different parts, for example in the event of a fall. According to an optional variant embodiment, dots of glue or screws can also be provided to ensure stable positioning of the parts relative to each other over time.

Other characteristics and/or construction details, optional or not, are described with reference to figures 5 and 6.

schematically illustrates a control signal 2 for the light emitted by the lighting device 10, according to a particular and non-limiting embodiment of the present invention.

FIG. 2 illustrates the signal used to control the light emitted by the light source 102 as a function of time, with the abscissa in time and the ordinate the intensity of the signal. Signal 2 corresponds to PWM modulation. The period of the signal T comprises 2 states, a first state 21 of duration T ₁ corresponding to a high level of the signal (maximum intensity value) and a second state 22 of duration T ₂ corresponding to a low level of the signal (minimum value of intensity). The period of signal T is such that T=T ₁ +T ₂ . The frequency F of the signal is such that F=1/T. Thus, the signal in the first state 21 activates the generation of light by the light source 102 whereas the second state 22 deactivates the generation of light by the light source 102. The signal 2 according to the example of FIG. 2 is a periodic square wave signal (also called a periodic square wave signal), the frequency of the signal corresponding to the number of squares or square waves per second. T ₁ corresponds to the period during which the light source 102 emits light and T ₂ corresponds to the period of time during which the light source 102 does not emit light. It is thus possible to define the duty cycle α of the signal as corresponding to the ratio between the duration during which the signal is in the first state 21 over the duration of the period, that is to say α=T ₁ /T. It is thus possible to vary the intensity of the luminous flux emitted by the light source 102 by varying the duration T ₁ with respect to T. The duty cycle α can thus take any value between 0 and 1 (or between 0 and 100%), the intensity of the luminous flux being all the more important or high as α is important or high.

The low level of the second state 22 is not limited to the example of FIG. 2 (which is located at 0 intensity) but can take other values (for example 10% or 20% of the high level of the first state 21).

Of course, signal 2 can take other forms. For example, signal 2 can take the form of a periodic triangle signal or a periodic sawtooth signal. Depending on the shape of the signal, the definition of the duty cycle may vary. It is thus possible to define an intensity threshold below which the light source does not emit light and above which the light source emits light. Thus the first signal state corresponds to the duration, during the signal period, during which the signal is above the threshold value and the second signal state corresponds to the duration, during the signal period, during which the signal is below the threshold value.

schematically illustrates a control unit in the form of a device 3, according to a particular and non-limiting embodiment of the present invention. The elements of device 3, individually or in combination, can be integrated in a single integrated circuit, in several integrated circuits, and/or in discrete components. The device 3 can be made in the form of electronic circuits or software (or computer) modules or else a combination of electronic circuits and software modules. The device 3 can for example be integrated into the lighting device 10 and ensure the functions of the electronic card 1032. According to a variant, the device 3 is independent of the lighting device and is coupled in communication with the latter, or for the less with the light source 102, wired or wirelessly. According to this variant, the lighting device 10 or its light source 102 is equipped with a wired or radio interface to communicate with the device 3.

The device 3 comprises one (or more) processor(s) 30 configured for the execution of the instructions of the software embedded in the device 3. The processor 30 can include integrated memory, an input/output interface, and various circuits known to those skilled in the art. The device 3 further comprises at least one memory 31, by a volatile at/or non-volatile memory and/or comprises a memory storage device which can comprise volatile and/or non-volatile memory, such as EEPROM, ROM, PROM , RAM, DRAM, SRAM, flash, magnetic or optical disk.

The computer code comprising the instructions to be loaded and executed by the processor is for example stored on the memory or the memory storage device 31.

According to a particular and non-limiting embodiment, the device 3 comprises a block 32 of interface elements for communicating with external devices, for example the lighting device 10 or a remote server for updating the software embedded in the device 3. The interface elements of block 32 include one or more of the following interfaces:

- RF radiofrequency interface, for example of the Bluetooth® or Wi-Fi® type;

- USB interface (from the English "Universal Serial Bus" or "Universal Serial Bus" in French);

- HDMI interface (from the English “High Definition Multimedia Interface”, or “Interface Multimedia Haute Definition” in French).

According to another particular embodiment, the device 3 comprises a communication interface 33 which makes it possible to establish communication with other devices, for example the lighting device 10. The communication interface 33 corresponds for example to a transmitter configured to transmit and receive information and/or data via the communication channel 330. The communication interface 33 comprises for example a modem and/or a network card and the communication channel can for example be implemented in a wired and/or wireless medium.

According to an additional particular embodiment, the device 3 can supply and/or receive signals to and/or from one or more external devices, such as a display screen 340, one or more loudspeakers 350 and/or or other peripherals 360 (potentiometers) via input/output interfaces 34, 35 and 36 respectively. According to a variant, one or the other of the external devices is integrated into the device 3. The display screen 340 corresponds for example to a touch screen acting as a man-machine interface to receive commands from a user seeking to configure the light emitted by the light source (for example selection of a frequency, a duty cycle and /or a color of light).

schematically illustrates an exploded view in perspective of a part of the lighting device 10, according to a particular and non-limiting embodiment of the present invention.

The representation of the lighting device 10 includes the light guide 101 and the light source 102. These two parts 101 and 102 are illustrated distant from each other for reasons of clarity of representation. In assembled mode, light source 102 is positioned against light guide 101 to ensure that as much light as possible from light source 102 enters light guide 101.

The light source 102 is composed according to the example of Figure 4 of a series of LEDs 40 arranged longitudinally on the wall of the light source 102 facing a side edge 41 of the light guide 101. The LEDs are arranged on a support made of composite material (for example of the FR-4 type (from the English "Flame Resistant 4" or in French "Resistant to the flames 4")) or advantageously of aluminum (for example of the SMI insulated metal substrate type ), to ensure better dissipation of the heat generated by the LEDs when they emit light. The light source 102 thus corresponds to a strip of LEDs. The number of LEDs depends for example on the dimensions of the edge of the light guide 101 on which the light source 102 is arranged. The number of LEDs varies for example from a few LEDs (for example 3, 4 or 5) to a few tens of LEDs. As illustrated in Figure 4, the LEDs 40 are arranged on all or part of the edge 41.

According to a variant, the light source 102 is arranged on a longitudinal edge 42 of the light guide.

The light source 102 being arranged on an edge of the light guide 101, the light generated by the light source is emitted tangentially with respect to the light guide for good light transmission in the light guide 101. The light guide light 101 is provided so that at least part of the light emitted by the light source 102 and transmitted in the light guide 101 is directed towards the bottom of the light guide, that is to say towards the lower face 43 of the light guide. The lower face 43 of the light guide corresponds to the face which rests on a support on which the lighting device is arranged. The lower face 43 of the light guide 101 also corresponds to the face farthest from a user 400 looking at the lighting device 10 or the support on which the lighting device is placed through the light guide 101.

According to a first embodiment, the series of LEDs 40 comprises a first group of LEDs emitting light in the visible spectrum (between 380 nm and 760 nm). The first group of LEDs comprises for example polychromatic LEDs (each LED emitting several colors, for example red, green and blue, each LED having a large spectral bandwidth). According to another example, the first group of LEDs is composed of a plurality of monochromatic LEDs, for example one or more LEDs emitting blue, one or more LEDs emitting green and one or more LEDs emitting red, the assembly of the Monochromatic LEDs to obtain a whole range of colors in the visible spectrum by combination. The series of LEDs 40 also includes a second group of LEDs emitting light corresponding to the amber color (that is to say around 580 nm) according to this first embodiment. Of course, polychromatic LEDs are not limited to red, green and blue colors but can also emit yellow or cyan light. Similarly, monochromatic LEDs may also include LEDs emitting yellow and/or cyan.

According to a second embodiment, the series of LEDs 40 is composed of monochromatic LEDs with a low spectral bandwidth (for example between 20 and 50 nm) with one or more LEDs for each of the following colors:

- indigo (i.e. around 380 to 430 nm);

- blue (i.e. around 440 to 490 nm);

- turquoise (i.e. around 490 to 520 nm);

- green (i.e. around 520 to 570 nm);

- yellow (i.e. around 570 to 590 nm);

- red (i.e. around 630 to 760 nm); And

- ruby (i.e. around 693 nm).

According to a third embodiment, the series of LEDs 40 is composed of low spectral bandwidth monochromatic LEDs of the second embodiment associated with one or more polychromatic LEDs and/or with one or more amber monochromatic LEDs.

schematically illustrates the path followed by the light emitted by the lighting device 10, according to a first particular and non-limiting embodiment of the present invention.

FIG. 5 illustrates the lighting device 10 placed on a support 53 that an observer or user 400 looks at, positioned above the lighting device 10. The device 10 is thus composed of a frame 106 holding the light guide 101 illuminated by LEDs 40 of the light source 102. According to the particular example of Figure 5, reflectors 51, 52 are positioned on all or part of the side edges and / or longitudinal to prevent the light emitted by the LEDs 40 and transmitted in the light guide does not escape through the edges of the light guide. Of course, these reflectors are optional, the lighting device 10 being able to operate without the reflectors 51, 52. According to the example of FIG. 5, the LEDs are arranged in notches or in a groove formed in the edge of the light guide 101 receiving the LEDs 40 from the light source to improve the penetration of the light emitted by the light source 102 into the light guide 101. According to a variant, the LEDs 40 do not penetrate the plate forming the guide of light and are arranged flush with the edge of the light guide.

The LEDs 40 emit for example a multitude of light rays 501 forming a light beam with an angle β equal for example to 50, 60 or 70°. These light rays are illustrated in solid bold line in Figure 5. These rays are transmitted and guided in the light guide 101, part 502 of the emitted light being directed towards the bottom of the light guide to illuminate the support 53. The direction of a part 502 of the light 501 emitted by the light source 102 towards the support 53 is for example obtained by the intrinsic properties of the material forming the light guide 101. According to a variant, the direction of a part of the light towards the support 53 is obtained thanks to a network of microstructures formed in the light guide 101. All or part of the light received by the support 53 is reflected by the support, according to the optical properties (for example refractive index, reflection index) of the support 53. The light reflected by the support 53 is illustrated by arrows 504 in dotted lines.

The light guide being transparent or semi-transparent, the light reflected by the support 53 reaches the eye or eyes of the user 400 who looks at the support 53 through the lighting device 10 and its light guide 101 A part 503 of the light radiation 501 can also optionally be received by the user's ocular system 400.

If the support 53 corresponds to a sheet of paper or a screen (of a tablet or of a smart telephone (“smartphone”) for example) on which is written or displayed a textual content for example, the user can thus read the textual content through the lighting device 10 while benefiting from the particular properties of the light emitted by this lighting device 10. For example, the user can adjust one or more parameters of the light source 102 of the lighting device 10 in such a way that the light emitted by the lighting device is warm by combining lighting obtained from the LEDs illuminating in the visible spectrum with the amber LED or LEDs. Warm-colored light corresponds to light having a color temperature of less than 5000°K, advantageously close to 3000°K. The contribution of amber LEDs makes it possible, for example, to minimize the contribution of blue which can interfere with the circadian cycle, particularly in the evening.

For a user suffering from dyslexia, the lighting device 10 can be used as a visual reading aid device. Thus, by choosing a frequency of the light control signal comprised between 60 and 200 Hz and a duty cycle comprised between 15 and 100% (depending for example on the general light intensity of the space in which the user is located 400 ), it has been observed that dyslexia disorders can be alleviated. Advantageously, the frequency is between 75 and 85 Hz or between 70 and 100 Hz and the duty cycle between 17 and 35 or between 15 and 60%. The user can thus test several frequency values and choose the one that allows him to best correct dyslexic disorders. To facilitate the reading of a text, a line is advantageously drawn or engraved on the light guide to bring the user's attention to a particular line of the textual content. According to this example, all of the LEDs forming the light source are driven or controlled in the same way, that is to say that the light emitted corresponds to the visible spectrum, for example reinforced in amber color. The following benefits have thus been observed for people suffering from dyslexia: attenuation or disappearance of visual clutter (from the English "crowding effect"), better spacing between letters and words, disappearance of mirror images and duplication of letters, all leading consequently to a better understanding of the texts read.

The lighting device can also be used as a light therapy or chromotherapy device by playing on the colors or color sequences emitted by the light source, for example at a signal frequency of between 1 and 30 Hz and a duty cycle of between 1 and 100%. The light source is thus controlled in color by activating the monochromatic LEDs or groups of LEDs to obtain a particular color or sequence of colors, that is to say with a particular temporal sequence (or sequence) of the colors, each color of the sequence being emitted for a duration determined or chosen by the user. According to a variant, programs prerecorded in the control unit can be triggered by the user. For example, to treat dry-type macular degeneration, the following sequence can be played: mixture of yellow and green at a frequency of 12 Hz for 4 minutes, then mixture of turquoise and blue at a frequency of 8 Hz for 10 minutes. To treat wet-type macular degeneration, the following sequence can be played: mixture of yellow and orange at 12 Hz for 5 minutes, then mixture of red and orange at 8 Hz for 7 minutes.

The lighting device also has the advantage of providing indirect type lighting by reflection of light by the support 53, which is particularly advantageous for people sensitive to light who cannot use light therapy lamps for the general public. or chromotherapy devices which implement direct type lighting.

Furthermore, the illumination at a point being inversely proportional to the square of the distance between the light source and the support 53, the lighting device 10 has the advantage of being as close as possible to the support, which makes it possible to have a lower light intensity for the same illumination than a device located a few tens of centimeters from the support. This makes it possible, for example, to limit the energy consumption necessary to power the light source.

schematically illustrates the path followed by the light emitted by the lighting device 10, according to a second particular and non-limiting embodiment of the present invention.

The lighting device according to the example of FIG. 6 corresponds to that of FIG. 5 except that the light source 102 is inclined at an angle δ with respect to the vertical plane of the edge of the light guide along of which the light source is arranged so as to favor the transmission of the light 501 towards the bottom of the light guide. The angle δ is an acute angle equal for example to a few degrees, for example 3, 5, 10 or 20°.

Of course, the invention is not limited to the embodiments described above but extends to a visual assistance device for people suffering from functional learning disorders and/or suffering from visual impairments such as pigmentary retinopathy, for example, thanks to the implementation of lighting of a support with light modulated at a frequency and a determined duty cycle making it possible to at least partially correct the disorders or deficiencies aroused.

Claims (10)

Lighting device (10) comprising a light source (101) associated with a light guide (102),
said light guide (101) being formed of a plate of a material suitable for transmitting the light emitted by said light source (102), said light source (102) being arranged over at least a part of an edge of said plate,
said light guide (101) being configured in such a way that at least a part of said light transmitted in said light guide (101) is directed so as to illuminate a support (53) on which said lighting device is placed (10), said material being adapted to pass the light reflected by said support (53). Device according to claim 1, wherein said plate comprises an array of microstructures made of said material to direct said at least part of said transmitted light into said light guide (101) so as to illuminate said support (53). Device according to Claim 1 or 2, for which the said light source (102) is arranged inclined with respect to the said edge of the said plate. Device according to any one of Claims 1 to 3, for which the said light is modulated in pulse width according to a determined duty cycle and a determined frequency. Device according to claim 4, for which said determined duty cycle is included in an interval of values ranging from 17 to 35% and said determined frequency is included in an interval of values ranging from 75 to 85 Hz. Device according to claim 4, for which said determined duty cycle is included in an interval of values ranging from 1 to 100% and said determined frequency is included in an interval of values ranging from 1 to 30 Hz. Device according to any one of claims 1 to 6, wherein said light source (102) comprises at least a first light-emitting diode emitting light in the visible spectrum and at least a second monochromatic amber light-emitting diode. Device according to any one of Claims 1 to 6, for which the said light source comprises a plurality of groups of monochromatic light-emitting diodes, each group comprising at least one monochromatic light-emitting diode and emitting a different color among the following colors: indigo, blue , turquoise, green, yellow, red and ruby. Device according to Claim 8, comprising means for controlling the emission of light by at least a part of the said plurality of groups of monochromatic light-emitting diodes according to a determined time sequence. Device according to one of Claims 1 to 9, further comprising a man-machine interface for controlling at least one parameter of the light emitted by the said light source.