Optical filter and imaging device comprising the same

摘要

An optical filter comprising a substrate and a dielectric multilayer film formed on at least one surface of the substrate, wherein the substrate comprises an aromatic polyether-based polymer having a glass transition temperature (Tg), measured via differential scanning calorimetry (DSC, heating rate: 20° C./min), of from 230 to 350° C.

主权项

1. An optical filter comprising a substrate and a dielectric multilayer film formed on at least one surface of the substrate, wherein the substrate comprises an aromatic polyether-based polymer having a glass transition temperature (Tg), measured via differential scanning calorimetry (DSC, heating rate: 20° C./min), of from 230 to 350° C.,
wherein the aromatic polyether-based polymer comprises at least one structural unit (i) selected from the group consisting of a structural unit represented by formula (1) and a structural unit represented by formula (2): wherein R1 to R4 are each independently a monovalent organic group having from 1 to 12 carbons; and “a” to “d” are each independently an integer from 0 to 4; and wherein R1 to R4 and “a” to “d” are each independently as defined in formula (1); Y is a single bond, —SO2—or >C═O; R7 and R8 are each independently a monovalent organic group having from 1 to 12 carbons or a nitro group; “g” and “h” are each independently an integer from 0 to 4; and “m” is 0 or 1; provided that when “m” is 0, R7 is not a cyano group.