Patent ID: 7109507
Filing Date: 2006-09-19
Classification: B41J,G01N

Abstract:
1. An optical object identifying device comprising: a light-emitting device; a first photodetector and a second photodetector, which receive light reflected from a surface of an object to be detected after the light is applied from the light-emitting device to the surface of the object to be detected; and an identification means for identifying a type of the object to be detected on a basis of values of outputs outputted from the first photodetector and the second photodetector, wherein the light-emitting device and the first photodetector exist respectively on both sides of a normal line established at an intersection of an optical axis of the light-emitting device and the surface of the object to be detected, the light-emitting device is arranged such that an angle made between the optical axis of the light-emitting device and the surface of the object to be detected becomes 10 to 30 degrees, the first photodetector is arranged such that an angle made between an optical axis of the first photodetector and the surface of the object to be detected becomes 10 to 30 degrees. the second photodetector is arranged such that an angle made between an optical axis of the second photodetector and the surface of the object to be detected becomes approximately 90 degrees so that the second photodetector receives at least light that leaves the surface of the object at an angle of approximately 90 degrees relative to the surface of the object; and wherein, the identification means calculates (A+B)/(A−B) and identifies the type of the object to be detected by the calculation value, where