作者: David Malcolm Marsh , Richard Daniel Slater
DOI:
关键词:
摘要: Improved optical means for automatically controlling or monitoring the position of a relatively moving member such as tool tip in numerically controlled machine has an image region datum line projected on to slit system. Light passing through falls photoelectric detector device which comprises array discrete elements. The elements are electronically scanned sequentially and electric circuit is provided produce output signal when preset change incident light intensity detected by any thus indicating presence movable at line. There may be two slits projecting images around transverse lines separate arrays so that can dimensions. Alternatively, place single dimensional suitably masked.