System for detecting reflecting objects
First Claim
1. A system for detecting reflecting objects comprisinga reflector supported on a supporting body,means for directing light on said supporting body and said reflector,a plurality of light detecting elements for receiving reflected light from said supporting body and said reflector, each of said plurality of light detecting elements producing an electrical output in response to light received from said supporting body and said reflector, said reflector being detected by a specific one of said plurality of said light detecting elements,means for detecting said reflector by comparing the electrical output of said specific one of said plurality of light detecting elements with a reference signal, andmeans for generating said reference signal from the average value of all of said electrical outputs from said plurality of light detecting elements.
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Abstract
In a system for optically detecting with a plurality of light detecting elements a reflecting object in the form of long stripe disposed on the surface of a traveling path, the average value of the respective electric quantities derived from the light detecting elements is obtained through arithmetic operation and the reference value is automatically changed according to the degree of the surface being soiled, by multiplying the average value by a certain safety factor, so that accurate detection can be performed independent of the degree of the soil on the traveling path surface.
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Citations
9 Claims
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1. A system for detecting reflecting objects comprising
a reflector supported on a supporting body, means for directing light on said supporting body and said reflector, a plurality of light detecting elements for receiving reflected light from said supporting body and said reflector, each of said plurality of light detecting elements producing an electrical output in response to light received from said supporting body and said reflector, said reflector being detected by a specific one of said plurality of said light detecting elements, means for detecting said reflector by comparing the electrical output of said specific one of said plurality of light detecting elements with a reference signal, and means for generating said reference signal from the average value of all of said electrical outputs from said plurality of light detecting elements.
Specification