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1. (WO1981000769) OPTICAL FILTERING ELEMENT
Latest bibliographic data on file with the International Bureau   

Pub. No.:    WO/1981/000769    International Application No.:    PCT/US1980/001198
Publication Date: 19.03.1981 International Filing Date: 15.09.1980
IPC:
G02B 5/22 (2006.01), G02C 7/10 (2006.01)
Applicants:
Inventors:
Priority Data:
74912 13.09.1979 US
Title (EN) OPTICAL FILTERING ELEMENT
(FR) ELEMENTS DE FILTRAGE OPTIQUE
Abstract: front page image
(EN)Optical filtering elements having two opposed surfaces and including at least one thin layer of stable non-reflective fluorescent material provide transparent articles which, when exposed to incident visible light at one surface of the fluorescent layer, absorb certain wavelengths within the fluorescent layer and emit longer but still visible wavelengths at the opposed surface of the fluorescent layer. Methods of forming such optical filtering elements include providing a thin coating or layer (12) including stable fluorescent material on an optical element (14) by means of a solution or coating composition including stable fluorescent material, or forming transparent sheets or films (2) containing stable fluorescent material and utilizing them as optical filtering elements or incorporating them in an optical structure. In order to avoid glare and reflection of fluorescent light at the incident side, preferred embodiments require layers of stable fluorescent material which are about 1 mil (0.0254 mm) or less in thickness.
(FR)Des elements de filtrage optique ayant deux surfaces opposees comprenant au moins une fine couche d'un materiau fluorescent stable non reflecteur permettent d'obtenir de articles transparents qui lorsqu'ils sont exposes a une lumiere incidente visible sur une surface de la couche fluorescente, absorbent certaines longueurs d'ondes dans la couche fluorescente et emettent des longueurs d'ondes plus grandes mais encore visibles a la surface opposee de la couche fluorescente. Des procedes de formation de ces elements optiques de filtrage consistent a former un revetement ou couche fine (12) consistant en un materiau fluorescent stable sur un element optique (14) au moyen d'une solution ou composition de revetement constituee par un materiau stable fluorescent, ou consistent a former des feuilles ou films transparents (2) contenant un materiau stable fluorescent et a les utiliser comme elements optiques de filtrage ou a les incorporer dans une structure optique. De maniere a eviter l'eblouissement et la reflexion de la lumiere fluorescente du cote incident, des modes preferes de realisation comprennent des couches de materiau stable fluorescent qui ont une epaisseurs d'environ 1mil (0,0254mm) ou moins.
Designated States:
Publication Language: English (EN)
Filing Language: English (EN)