| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical filter using 2 or more kinds of cyanine compounds having low absorption in a visible range, especially at 400 nm to 500 nm, especially a near infrared ray cutting filter (optical filer) for image pickup devices especially such as CCD or CMOS.SOLUTION: There is provided uses of cyanine pigment compounds represented by the following formulae (1) and (2), where Rand Rrepresent substituents such as an alkyl group. |
