Method and apparatus for paper material discrimination with two near-infrared lights
AssigneeHitachi, Ltd.
InventorsToshiro Uemura, Yoshitaka Takezawa, Mitsunari Kano, Junichi Katagiri, Eiji Mizuno
Life of this patent
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Abstract
A bill discriminating method of discriminating a paper material independent of a light/dense pattern caused by a difference of manufacturing steps and discriminating a paper material of paper without being influenced by humidity or deterioration of the paper material is provided, Two kinds of infrared rays of different kinds of wavelengths are irradiated onto the paper, thereby discriminating the paper material of the paper by using an absorbance difference between photometric values.
Claims21
A Method for paper material discrimination, comprising the steps of:
- irradiating two kinds of lights in near-infrared ranges of different wavelengths onto paper as a measurement target;
- obtaining absorbances of the paper to which said two kinds of lights have been irradiated, respectively;
- calculating an absorbance difference from said obtained absorbances;
- and
- discriminating a paper material of the paper from said calculated absorbance difference on the basis of information in which paper materials of paper and absorbance differences of said paper materials have been made to correspond to each other and which has been stored in memory means.
An apparatus for paper material discrimination, comprising:
- a light emitting unit for irradiating two kinds of lights in rear-infrared ranges of different wavelengths onto paper as a measurement target;
- a photosensing unit for receiving lights necessary for obtaining absorbances of the paper to which said two kinds of lights have been irradiated;
- and
- a control unit for calculating an absorbance difference of said two kinds of lights from the lights received by said photosensing unit and discriminating a paper material of the paper from said calculated absorbance difference on the basis of information in which paper materials of paper and absorbance differences of said paper materials have been made to correspond to each other and which has been stored in memory means.
An apparatus for paper material discrimination, comprising ;
- a conveying mechanism for conveying a bill;
- a measuring mechanism for measuring physical amounts necessary for a first absorbance regarding a first wavelength having a wavelength width around 1480 nm as a center and a second absorbance regarding a second wavelength having a wavelength width around 2100 nm as a center with respect to the bill conveyed by said convoying mechanism;
- a storing unit for storing information in which paper materials of bills to be discriminated and a difference between said first and second absorbances have been made to correspond to each other;
- and
- a control unit for obtaining the difference between said first and second absorbances from said physical amounts measured by said measuring mechanism and discriminating authenticity of said bill from said information stored in said storing unit.
Dependencies are inferred from the claim text.