Lighting device that facilitates reading
View Patent ↗The invention relates to a device (LIGHT) for lighting a graphic and/or textual content present on any medium and in particular on a paper medium. The lighting device (LIGHT) is configured to periodically activate and deactivate said lighting beam in successive cycles carried out at a preset frequency Fd. Each cycle has a duration T and comprises a period of activation of the light beam of duration T 1 followed by a period of deactivation of the light beam of duration T 2 or vice versa. The frequency Fd is comprised in an interval of values ranging from 60 to 90 Hz and the duration T 1 of the periods of activation of the light beam is comprised in an interval of values ranging from 15 to 30% of the duration T of the cycles.
1. Lighting device (LIGHT) for facilitating the reading of graphic and/or textual content on any given support by dyslexic subjects, said device comprising a control unit (CTRLU) and a lighting module (LIMOD) adapted to the generation of a light beam in a spectrum of visible light, said lighting device (LIGHT) being configured to periodically activate and deactivate said lighting beam according to successive cycles carried out at a predetermined frequency (Fd) that is a reciprocal of the sum of a period of activation of the light beam and of a period of deactivation of the light beam, each cycle having a duration T and comprising a period of activation of the light beam having a duration T 1 preceded or followed by a period of deactivation of the light beam having a duration (T 2 ), Fd being such that Fd=1/(T 1 +T 2 ), said device being characterised in that the frequency (Fd) is comprised in an interval of values ranging from 60 to 90 Hz, and in that the duration (T 1 ) of the periods of activation of the light beam is comprised in an interval of values ranging from 15 to 30% of the duration (T) of the cycles.
2. Lighting device according to claim 1 , wherein said frequency (Fd) varies over time.
3. Lighting device according to claim 2 , wherein said predetermined frequency (Fd) is called wobulation frequency, takes advantage of the Hebbian mechanisms of the neurons of the cortex and varies by increasing by successive steps up to a maximum value according to a first speed, called increasing speed, then varies by decreasing by successive steps down to a minimum value according to a second speed, called decreasing speed, the increasing and decreasing variations repeating iteratively over time.
4. Lighting device according to claim 3 , wherein said decreasing speed is equal to said increasing speed.
5. Lighting device according to claim 4 , wherein said successive steps have equal durations.
6. Lighting device according to claim 4 , wherein said successive steps vary in duration so that the value of said frequency (Fd) changes according to a waveform in the shape of a triangle, a saw, or a sinusoid between said maximum value and said minimum value.
7. Lighting device according to claim 1 , wherein the duration T 1 of said periods of activation of the light beam vary over time.
8. Lighting device according to claim 1 , wherein said light beam is generated using one or more elements of the LED type.
9. Lighting device according to claim 1 , characterised in that it is of a type comprised in the list: a table lamp, a torch, a headlamp, a pen light, a pocket lamp, a telephone lamp, a smartphone lamp, a torch watch, a keyring lamp, a ceiling light, a standard lamp, a lightbulb, a lighting tube, a projector, a motor vehicle projector, an overhead projector, a luminous wall coating, a light-up rug, a light-up bracelet, a light-up frame, a mini-lamp to be positioned on a book, a device configured for interior lighting or a device configured for exterior lighting, urban or not.
10. Lighting device according to claim 1 , wherein said frequency (Fd) is equal to 70 Hz or 84 Hz and the duty cycle T 1 /(T 1 +T 2 ) is equal to 20%.
11. Lighting device according to claim 1 , characterised in that it is a table lamp or a mini-lamp to be positioned on a book.
12. Method for facilitating the reading of graphic and/or textual content on any given support by a dyslexic subject, characterised in that it implements a lighting device as defined according to claim 1 that is periodically activated and deactivated according to successive cycles carried out at a predetermined frequency Fd, each cycle having a duration T and comprising a period of activation of the light beam having a duration T 1 preceded or followed by a period of deactivation of the light beam having a duration T 2 ,
the frequency Fd being defined by the equation Fd=1/(T 1 +T 2 ),
Fd being comprised in an interval of values ranging from 60 to 90 Hz, and
the duration T 1 of the periods of activation of the light beam being comprised in an interval of values ranging from 15 to 30% of the duration T of the cycles.
13. Method for facilitating the reading of graphic and/or textual content according to claim 12 , wherein said predetermined frequency (Fd) is defined by a user of said lighting device.