| 摘要 |
PURPOSE:To simplify a circuit and to economize the capacity of a storage device by providing a logic circuit which inhibits the other elements from outputting defect signals when the defect signal is generated from one element of a linear array multielement photodetector. CONSTITUTION:With respect to outputs of individual elements of a linear array multielement photodetector 5, defect signals are generated by amplifiers 7-1-7-6 and comparators 8-1-8-6. Defect signals are inputted to 6-input AND circuits 11-1-11-6 respectively. Signals obtained by allowing outputs of the other AND circuits to pass NOT circuits 12-1-12-6 are inputted to the other five inputs of each of circuits 11-1-11-6. Consequently, each of circuits 11-1-11-6 outputs one defect signal, and their outputs are inputted to a 6-input OR circuit 13, and the output is used as a gate signal of a counter to discriminates the defect with one counter. Thus, the circuit is simplified and the capacity of the storage device is reduced. |
