Fluoropolymer for chromatic aberration-free lens and...

G - Physics – 02 – B

Patent

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G02B 1/04 (2006.01)

Patent

CA 2640199

This invention provides a material that has properties necessary for chromatic aberration correction lenses and has excellent moldability and impact resistance. The material is an amorphous fluoropolymer having a carbon atom chain as a main chain and containing a fluorine atom-bonded carbon atom as the carbon atom constituting the main chain. The fluoropolymer is characterized by satisfying requirements: .nu.d > 75, .theta.gF > 0.50 and .DELTA..theta.gF > 0.03 wherein .nu.d represents Abbe number; .theta.gF represents partial dispersion ratio of g-F line; and .DELTA..theta.gF represents deviation from a standard line of the partial dispersion ratio of the g-F line.

L'invention concerne un matériau ayant les propriétés nécessaires pour des lentilles de correction d'aberrations chromatiques et présentant une excellente aptitude au moulage et une excellente résistance aux chocs. Le matériau est un fluoropolymère amorphe ayant une chaîne d'atome de carbone comme chaîne principale et contenant un atome de carbone lié à un atome de fluor comme atome de carbone constitutif de la chaîne principale. Le fluoropolymère est caractérisé en ce qu'il remplit les exigences suivantes : ?d > 75, ?gF > 0,50 et ??gF > 0,03, ?d représentant le nombre d'Abbe ; ?gF représentant le rapport de dispersion partielle de la ligne g-F ; et ??gF représentant la déviation d'une ligne standard du rapport de dispersion partielle de la ligne g-F.

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