WIDEBAND OPTICAL SHUTTER USING CARBON BLACK

• Main Authors: KIM, Min Su, JEON, Hyun Soo, LIM, Young Jin, LEE, Seung Hee, KANG, Min Ji
• Format: Patent
• Language: English; French; Korean
• Published: 04.07.2024
• Subjects: 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; DOORS, WINDOWS, SHUTTERS, OR ROLLER BLINDS IN GENERAL; FIXED CONSTRUCTIONS; FIXED OR MOVABLE CLOSURES FOR OPENINGS IN BUILDINGS, VEHICLES,FENCES OR LIKE ENCLOSURES IN GENERAL, e.g. DOORS, WINDOWS,BLINDS, GATES; FREQUENCY-CHANGING; LADDERS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FORVEHICLES; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; VEHICLES IN GENERAL; WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILARDEVICES FOR VEHICLES

One embodiment of the present invention provides a wideband optical shutter using carbon black. Carbon black particles dispersed in a dielectric fluid and charged with a negative charge may, when in a transparent state by electrophoresis, apply a horizontal electric field by using only interdigitated electrodes in the lower substrate and may, when in a black state, apply a vertical electric field by using plane-shaped electrodes in the upper substrate and the interdigitated electrodes in the lower substrate. In addition, an electrode layer may be coated with an insulating film to prevent the charged particles from being in direct contact with the electrodes, thereby minimizing the particle agglomeration without losing electric charge. Accordingly, the wideband optical shutter can operate in a wide temperature range even with a low driving voltage, can be used from ultraviolet to infrared, and can solve the problem of discoloration. Un mode de réalisation de la présente invention concerne un obturateur optique à large bande utilisant du noir de carbone. Des particules de noir de carbone dispersées dans un fluide diélectrique et chargées avec une charge négative peuvent, lorsqu'elles sont dans un état transparent par électrophorèse, appliquer un champ électrique horizontal en utilisant uniquement des électrodes interdigitées dans le substrat inférieur et peuvent, lorsqu'elles sont dans un état noir, appliquer un champ électrique vertical en utilisant des électrodes en forme de plan dans le substrat supérieur et les électrodes interdigitées dans le substrat inférieur. En outre, une couche d'électrode peut être revêtue d'un film isolant pour empêcher les particules chargées d'être en contact direct avec les électrodes, ce qui permet de réduire au minimum l'agglomération de particules sans perdre de charge électrique. En conséquence, l'obturateur optique à large bande peut fonctionner dans une plage étendue de températures même avec une faible tension d'attaque, peut être utilisé de l'ultraviolet à l'infrarouge et peut résoudre le problème de décoloration. 본 발명의 일실시예는 카본블랙을 이용한 광대역 광셔터를 제공한다. 유전성 유체에 분산되어 음전하로 대전된 카본블랙 입자는 전기영동 방식에 의해 투명상태일때는 하부기판에 깍지형 전극만을 이용하여 수평전기장을 인가할 수 있고, 어둠상태일때는 상부 기판의 플레인 형태의 전극과 하부 기판의 깍지형 전극을 이용하여 수직전기장을 인가할 수 있다. 또한, 전극층에 절연막을 코팅함으로써 대전된 입자가 전극에 직접적으로 접촉하는 것을 막아 전하량을 잃어버리지 않고 입자가 응집되는 현상을 최소화할 수 있다. 이를 통하여 낮은 구동전압으로도 넓은 온도 범위에서 동작이 가능하고, 자외선부터 적외선까지의 광대역 광셔터로 사용 가능하며, 변색의 문제를 해결할 수 있다.