Patent ID: 6998623
Filing Date: 2006-02-14
Classification: G07D

Abstract:
1. A paper sheet fluorescence sensor for illuminating a paper sheet with light while conveying the paper sheet, and detecting fluorescence emitted from the paper sheet, the sensor comprising: an ultraviolet light source accommodated in a housing for emitting light including ultraviolet light; an ultraviolet-reflecting filter, accommodated in the housing, for reflecting the light emitted from the ultraviolet light source to illuminate a conveying path of a paper sheet orthogonally to the conveying path, the ultraviolet-reflecting filter increasing in transmission of light in response to an increase in ambient temperature; an ultraviolet-transmitting filter disposed between the ultraviolet light source and the ultraviolet-reflecting filter; and a fluorescence-detecting device, accommodated in the housing, for receiving, by way of the ultraviolet-reflecting filter, and detecting, the fluorescence emitted from the paper sheet upon illumination with ultraviolet light.