| 摘要 |
<p>PURPOSE: To provide a photoelectron controlling unit which has a high degree of freedom for operation, and is resistant to noise, and in which the operating margin can be automatically decided. CONSTITUTION: An electron system 60 is controlled by a microprocessor 62 having an input key pad 24, and transmits a pulse from an photo-transmitter 64. The reflected wave is detected by a phototransmitter 70, and is entered into a main variable gain part 74, and the output is divided into two, so that one of them is entered into a margin variable amplifier 84. This includes a multiple D/A convertor 86 and an amplifier 88, the output of the same is supplied to a margin comparing unit 94, to be compared with a reference signal from a reference voltage generator 92, and a margin signal SMAR is outputted. The other output is compared with the standard signal similarly, through an amplifier 80. and the main optical pulse detecting signal SDET is outputted. These signals are controlled by the microprocessor 62, and the operation margin value is specified, so that the main variable gain part 74 is automatically controlled to obtain the optimum gain.</p> |
