Patent ID: 7167247

Claim:
A paper material identifying machine for identifying paper material comprising: a first irradiating module irradiating first irradiated light to paper to be identified, the first irradiated light included in a first waveband; a second irradiating module irradiating second irradiated light to the paper, the second irradiated light included in a second waveband different from the first waveband; a first detecting module detecting a luminous intensity of first reflected light or first transmitted light, the first reflected light reflected from the paper by irradiating the first irradiated light to the paper, the first transmitted light transmitted through the paper by irradiating the first irradiated light to the paper; a second detecting module detecting luminous intensity of second reflected light or second transmitted light, the second reflected light reflected from the paper by irradiating the second irradiated light to the paper, the second transmitted light transmitted through the paper by irradiating the second irradiated light to the paper; a measuring module measuring a first ratio and a second ratio, the first ratio defined as a ratio between the intensity of the first irradiated light and that of the light detected by the first detecting module, the second ratio defined as a ratio between the intensity of the second irradiated light and that of the light detected by the second detecting module; and an identification module identifying the paper material of the paper by comparing an evaluation value, defined by the first ratio and the second ratio, with prescribed standard values, wherein the evaluation value is defined by a following formula DA; DA=A 1 −Ca ·A 2; A 1 =L 1/ L 10 or A 1=log( L 1/ L 10) A 2 =L 2/ L 20 or A 1=log( L 2/ L 20) L10: representing the intensity of the first irradiated light L20: representing the intensity of the second irradiated light L1: representing the intensity of the first reflected light or the first transmitted light L2: representing the intensity of the second reflected light or the second transmitted light Ca: a parameter (arbitrary value).