Patent ID: 7359543

Claim:
An image detector for bank notes comprising: a first image detection sensor; a first light emitting device provided on an opposite side of a bank note transportation path to said first image detection sensor, said first light emitting device emitting first light of a plurality of different wavelengths towards a bank note transported on said bank note transportation path, and said first image detection sensor detecting transmitted light that is the first light transmitted through said bank note; a second light emitting device provided on the same side of said bank note transportation path as said first image detection sensor, said second light emitting device emitting second light of a plurality of different wavelengths towards a first face of a bank note transported on said bank note transportation path, and said first image detection sensor detecting first reflected light that is the second light reflected from the first face of said bank note; a second image detection sensor provided on the opposite side of said bank note transportation path to said first image detection sensor; and a third light emitting device provided on the same side of said bank note transportation path as said second image detection sensor, said third light emitting device emitting third light of a plurality of different wavelengths towards a second face, opposed to the first face, of said bank note transported on said bank note transportation path, and said second image detection sensor detecting second reflected light that is the third light reflected from the second face of said bank note.