Patent ID: 7772356

Claim:
An infrared absorption filter consisting essentially of a polycarbonate resin having a fluorene skeleton and a coloring matter having infrared absorptivity, wherein the polycarbonate resin having a fluorene skeleton contains 20 to 100 mol % of a recurring unit represented by the following formula (1): wherein R 1a and R 1b are the same or different and each an alkylene group having 2 to 10 carbon atoms, R 2a , R 2b , R 3a and R 3b are the same or different and each a hydrocarbon group having 1 to 10 carbon atoms or halogen atom, k1 and k2 are the same or different and each an integer of 0 to 2, and m1, m2, n1 and n2 are the same or different and each an integer of 0 to 4, and 0 to 80 mol % of a recurring unit represented by the following formula (2): wherein R X and R Y are the same or different and each a hydrogen atom or alkyl group having 1 to 4 carbon atoms, q and r are each independently 1 or 2, and W is a single bond, alkylidene group having 1 to 5 carbon atoms, cycloalkylidene group having 5 to 10 carbon atoms or di(alkylidene having 1 to 3 carbon atoms)phenylene group.