| 摘要 |
PURPOSE:To eliminate the need for a detecting element except a photoelectric converting element and to eliminate the impossibility for the detecting due to the slip position dislocation by detecting the skew quantity of the slip at the time of a sub-scanning from a quantizing signal obtained by the main scanning. CONSTITUTION:The reflecting light beams from a slip 10 is image-formed through a lens 13 onto a photoelectric converting element train 32 of the prescribed length. Respective element train outputs of a train 30 are quantized by a quantizing circuit 40, inputted to a pattern memory 50 as a quantizing signal and inputted to an adding circuit 100. The circuit 100 adds '1' when the input is present, '0' when the input is absent, to the contents of an address corresponding to a memory element 110 and write them into the same address. This operation is repeated until the slip 10 is sent to a constant distance. When the slip is sent to the constant distance, the contents of the element 110 are read, and when the output is changed from '0', the number is stored into a memory circuit 120 and the address is stored into a memory circuit 170. Thereafter, each time the number except '0' is outputted, the number and address are respectively overlapped and stored to memory circuits 130 and 180. After reading is completed, longitudinal and horizontal direction difference outputs are obtained by subtracting circuits 140 and 190, both outputs are divided by a dividing circuit 150 and the skew quantity is outputted.
|
