Patent ID: 8131192
Filing Date: 2012-03-06
Classification: B41J,B65H,G01N,G03G

Abstract:
1. A record-medium determining apparatus comprising: plural luminescent light sources that irradiate light of different frequencies to a surface of a record medium; a photodetector that detects reflected light irradiated from the luminescent light source and reflected by the record medium; a light shielding plate that has a through hole provided such that, when the irradiated light totally reflects on the surface of the record medium, reflected light of the irradiated light irradiated from a specific luminescent light source among the plural luminescent light sources is made incident on the photodetector and reflected light of the irradiated light irradiated from portions of the other luminescent light sources is not made incident on the photodetector; and a signal-intensity detecting device that determines a type of the record medium according to whether a number of frequencies that are detected is large or small by detecting intensity of frequencies of each of the incident lights from an output signal of the photodetector by converting the light detected by the photodetector into an electric signal.