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1. (WO2002006858) ACHROMATIC DIFFRACTIVE DEVICE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/2002/006858 International Application No.: PCT/GB2001/003186
Publication Date: 24.01.2002 International Filing Date: 16.07.2001
Chapter 2 Demand Filed: 18.02.2002
IPC:
G02B 5/02 (2006.01) ,G02B 5/18 (2006.01)
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
02
Diffusing elements; Afocal elements
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
18
Diffracting gratings
Applicants:
OPTAGLIO LIMITED [GB/GB]; Meridian House Greenwich Way Andover Hants SP10 4DU, GB (AllExceptUS)
DRINKWATER, John [GB/GB]; GB (UsOnly)
Inventors:
DRINKWATER, John; GB
Agent:
GILL, David, Alan; W.P. Thompson & Co. Celcon House 289-293 High Holborn London WC1V 7HU, GB
Priority Data:
0017618.018.07.2000GB
0020724.122.08.2000GB
Title (EN) ACHROMATIC DIFFRACTIVE DEVICE
(FR) DIFFRACTEUR
Abstract:
(EN) The invention provides in particular for an achromatic diffractive diffuser comprising a surface relief diffractive device arranged such that, under illumination by ambient light, the diffractive effect serves to provide a uniform achromatic diffuser reflection into a defined viewing zone for observation by an observer, and also such that the achromatic diffractive replay of the device has a non-symmetric distribution of diffractive light intensity between positive and negative diffractive order such that the diffractive efficiency in the desired diffractive order is enhanced over that of the undesired order to provide an enhanced brightness achromatic device.
(FR) Cette invention concerne en particulier un diffuseur de diffraction achromatique qui comprend un diffracteur à relief de surface arrangé de sorte que, lorsqu'il est éclairé par la lumière ambiante, l'effet de diffraction apporte une réflexion uniforme du diffuseur achromatique dans une zone de visualisation définie observable par un observateur. Le diffracteur à relief de surface est également arrangé de sorte que la réexécution diffractive achromatique du dispositif présente une distribution dissymétrique de l'intensité de la lumière de diffraction entre un ordre de diffraction positif et un ordre négatif, si bien que l'efficacité de diffraction de l'ordre de diffraction désiré est améliorée relativement à celle de l'ordre non désiré, ce qui améliore l'intensité lumineuse du dispositif achromatique.
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Designated States: AE, AG, AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, BZ, CA, CH, CN, CO, CR, CU, CZ, DE, DK, DM, DZ, EE, ES, FI, GB, GD, GE, GH, GM, HR, HU, ID, IL, IN, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MA, MD, MG, MK, MN, MW, MX, MZ, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, TZ, UA, UG, US, UZ, VN, YU, ZA, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, MZ, SD, SL, SZ, TZ, UG, ZW)
Eurasian Patent Organization (AM, AZ, BY, KG, KZ, MD, RU, TJ, TM)
European Patent Office (AT, BE, CH, CY, DE, DK, ES, FI, FR, GB, GR, IE, IT, LU, MC, NL, PT, SE, TR)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, GW, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
EP1303795EP1804091US20040032659US20050270604US20100085642AU2001270833