| abstract |
The present invention provides a near-infrared cut filter (optical filter) for an image sensor such as a CCD or a CMOS, characterized by having a high heat resistance and a low visible range absorption and a low visible range absorption using the cyanine compound. A cyanine dye compound represented by formula (1) is provided. (In the formula, group A represents an alkyl group having 1 to 4 carbon atoms, a cyclohexylmethyl group, a benzyl group, etc.) [Selection figure] None |