| 摘要 |
An object is to provide an image detector for bank notes which enables the cost to be lowered. Accordingly this has: a light emitting device 31 ( 31 X) which is arranged facing an image detection sensor 24 ( 24 X), and which irradiates light of a plurality of different wavelengths ranges towards a bank note on a bank note transportation path 12 , and detects light of the light which has transmitted through the bank note with an image detection sensor 24 ( 24 X); a light emitting device 27 ( 27 X) which is provided on the same side as the image detection sensor 24 ( 24 X), which irradiates light of a plurality of different wavelengths ranges towards a bank note S, and detects light of the light which is reflected from the bank note with the image detection sensor 24 ( 24 X); an image detection sensor 24 ( 24 Y) provided on the opposite side to the image detection sensor 24 ( 24 X); and a third light emitting device 27 ( 27 Y) provided on the same side as the second image detection sensor 24 ( 24 Y), which irradiates light of a plurality of different wavelength ranges towards the bank note S, and detects light of the light which is reflected from the bank note S with the image detection image detection sensor 24 ( 24 Y).
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