Patent ID: 11860390
Assignee: FUJIFILM CORPORATION
Field: Optics (Instruments)
Classification: CPC G  C  H | IPC G  H

Claim 4:
5. The wavelength selective absorption filter according to claim 1,
wherein the dye A is a coloring agent represented by General Formula (A1),, in the formula, R1 and R2 each independently represent an unsubstituted alkyl group or a substituted alkyl group having a substituent, or an unsubstituted aryl group or a substituted aryl group having a substituent, R3 to R6 each independently represent a hydrogen atom or a substituent, and R5 and R6 may be bonded to each other to form a 6-membered ring which may have a substituent, provided that the substituent of the substituted alkyl group or the substituted aryl group, the substituent employable as R3 to R6, and the substituent of the 6-membered ring that may be formed by bonding R5 and R6 are selected from the group consisting of the following substituents:
a halogen atom, an alkyl group, a cycloalkyl group, an aralkyl group, an alkenyl group, an alkynyl group, an aryl group, a heterocyclic group, a cyano group, a hydroxy group, a nitro group, a carboxyl group (may be in the form of a salt), an alkoxy group, an aryloxy group, a silyloxy group, a heterocyclic oxy group, an acyloxy group, a carbamoyloxy group, a sulfonyloxy group, an alkoxycarbonyloxy group, an aryloxycarbonyloxy group, an amino group, an aminocarbonylamino group, an alkylcarbonylamino group, an alkoxycarbonylamino group, an aryloxycarbonylamino group, a mercapto group, an alkylthio group, an arylthio group, a heterocyclic thio group, a sulfo group (may be in the form of a salt), an alkylsulfinyl group, an arylsulfinyl group, an alkylsulfonyl group, an arylsulfonyl group, an acyl group, an aryloxycarbonyl group, an alkoxycarbonyl group, an imide group, a phosphino group, a phosphinyl group, a phosphinyloxy group, a phosphinylamino group, or a silyl group.