Optical motion detector, transport system and transport processing system

An optical motion detector comprising:

• a light-emitting device;
• a collimator lens for collimating a light beam emitted from the light-emitting device;
• an object lens, which concentrates the light beam collimated by the collimator lens and applies the light beam to a measurement object that moves in a prescribed direction, forming a light spot that has a prescribed spot diameter on the measurement object;
• a beam splitter, which splits a reflected light which belongs to a reflected light from the light spot of the measurement object and is concentrated via the object lens;
• a light-receiving lens, which concentrates the reflected light split by the beam splitter;
• two pinholes, through which reflected lights pass, wherein the lights belong to the reflected light concentrated by the light-receiving lens and come from two regions inside the light spot located at a prescribed interval on a straight line parallel to a measurement object travel direction;
• two light-receiving sections on which the reflected lights, which have passed through the two pinholes, are respectively made incident;
• and
• a measuring section, which measures at least one of a travel speed and a quantity of movement of the measurement object on the basis of outputs of the two light-receiving sections.