ELECTRO-OPTIC BLOCKING DEVICE

• Main Authors: DANIEL, EMMANUEL, GAUTIER, PASCAL, CAILLAUD, BERTRAND, DE BOUGRENET DE LA TOCNAYE, JEAN-LOUIS, DE BOUGRENET DE LA TOCNAYE, THIBAULT
• Format: Patent
• Language: English; French
• Published: 08.10.2009
• Subjects: BANDAGES, DRESSINGS OR ABSORBENT PADS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF,TUBULAR STRUCTURES OF THE BODY, E.G. STENTS; FILTERS IMPLANTABLE INTO BLOOD VESSELS; FIRST-AID KITS; FOMENTATION; FREQUENCY-CHANGING; HUMAN NECESSITIES; HYGIENE; MEDICAL OR VETERINARY SCIENCE; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; PHYSICS; PROSTHESES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TREATMENT OR PROTECTION OF EYES OR EARS

The invention relates to an electro-optic blocking device (1) that enables the attenuation of a light signal (2) and which includes at least one cell (10) including a first liquid crystal material (11). According to the invention, the electro-optic blocking device (1) comprises at least one second cell (20) including a second liquid crystal material (21) that forms a stroboscopic blocker as long as the intensity of the light signal (2) is lower than or equal to a first threshold, and a first cell (10) is in a blocking state as long as the intensity of the light signal (2) is greater than the first threshold. L'invention concerne un dispositif d'obturation électro-optique (1) permettant d'atténuer un signal lumineux (2) et comprenant au moins une première cellule (10) comprenant un premier matériau (11) cristal liquide. Selon l'invention, le dispositif d'obturation électro-optique (1) comprend au moins une seconde cellule (20) comprenant un second matériau (21) cristal liquide formant un obturateur stroboscopique tant que l'intensité du signal lumineux (2) est inférieure ou égale à un premier seuil, et une première cellule (10) étant dans un état bloquant tant que l'intensité du signal lumineux (2) est supérieure au premier seuil.