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1. (WO1998050806) BRIGHTNESS ENHANCEMENT ARTICLE
Latest bibliographic data on file with the International Bureau

Pub. No.: WO/1998/050806 International Application No.: PCT/US1998/009278
Publication Date: 12.11.1998 International Filing Date: 06.05.1998
Chapter 2 Demand Filed: 05.10.1998
IPC:
G02B 5/04 (2006.01)
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
04
Prisms
Applicants:
MINNESOTA MINING AND MANUFACTURING COMPANY [US/US]; 3M Center P.O. Box 33427 Saint Paul, MN 55133-3427, US
Inventors:
FONG, Bettie, C.; US
KRETMAN, Wade, D.; US
KOTCHICK, Keith, M.; US
COBB, Sanford, Jr.; US
MILLER, Richard, A.; US
WILLIAMS, Todd, R.; US
TOYOOKA, Kazuhiko; US
Agent:
BUCKINGHAM, Stephen, W. ; Minnesota Mining and Manufacturing Company Office of Intellectual Property Counsel P.O. Box 33427 Saint Paul, MN 55133-3427, US
VOSSIUS & PARTNER; P.O. Box 86 07 67 D-81634 München, DE
Priority Data:
08/853,26109.05.1997US
Title (EN) BRIGHTNESS ENHANCEMENT ARTICLE
(FR) ARTICLE D'ACCENTUATION DE LA LUMINOSITE
Abstract:
(EN) A brightness enhancement article that includes: (a) a transparent, flexible substrate; (b) a first major surface having an array of prisms with blunted or rounded peaks characterized by a chord whidth, cross-sectional pitch width, and radius of curvature in which the chord width is equal to about 20-40 % of the cross-sectional pitch width and the radius of curvature is equal to about 20-50 % of the cross-sectional pitch width; and (c) a second major surface characterized by a plurality of light scattering protrusions. The article has a haze value between about 20-60 % and a transmission value no greater than about 94 % when measured under conditions in which the first surface has a substantially planar topography.
(FR) Cette invention se rapporte à un article d'accentuation de la luminosité qui comporte (a) un substrat souple et transparent; (b) une première surface principale comportant un ensemble de prismes à pointes émoussées ou arrondies, caractérisées par des valeurs particulières de longueur de corde, de longueur d'écartement transversal et de rayon de courbure, la longueur de corde étant égale à 20-40 % environ de la longueur d'écartement transversal et le rayon de courbure étant égal à 20 à 50 % environ de la longueur d'écartement transversal; et (c) une seconde surface principale caractérisée par une pluralité de protubérances conçues pour la diffusion de la lumière. Cet article possède une valeur de trouble comprise approximativement entre 20 et 60 % et une valeur de transmission inférieure ou égale à 94 % lorsqu'on mesure ces valeurs dans des conditions telles que la première surface possède une topographie sensiblement plane.
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Designated States: AL, AM, AT, AU, AZ, BA, BB, BG, BR, BY, CA, CH, CN, CU, CZ, DE, DK, EE, ES, FI, GB, GE, GH, GM, GW, HU, ID, IL, IS, JP, KE, KG, KP, KR, KZ, LC, LK, LR, LS, LT, LU, LV, MD, MG, MK, MN, MW, MX, NO, NZ, PL, PT, RO, RU, SD, SE, SG, SI, SK, SL, TJ, TM, TR, TT, UA, UG, UZ, VN, YU, ZW
African Regional Intellectual Property Organization (ARIPO) (GH, GM, KE, LS, MW, SD, SZ, 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)
African Intellectual Property Organization (BF, BJ, CF, CG, CI, CM, GA, GN, ML, MR, NE, SN, TD, TG)
Publication Language: English (EN)
Filing Language: English (EN)
Also published as:
KR1020010012365SG68520EP0980533JP2001524225 CN1255202CA2288093
AU1998073708