ADJUSTABLY LIGHTED REFERENCE PHOTOCELL CIRCUIT ARRANGEMENT FOR A PHOTOCELL SENSING ASSEMBLY

摘要

47,688 AN ADJUSTABLY LIGHTED REFERENCE PHOTOCELL CIRCUIT ARRANGEMENT FOR A PHOTOCELL SENSING ASSEMBLY A photocell sensing assembly for an optoelectronic encoder includes an adjustably lighted reference photocell arrangement for providing a variable predetermined reference output value. An adjustable shutter assembly regulates light entensities in the arrangement. The reference output value is established relative to individual outputs of a plurality of encoding photocells to be sampled by a detecting circuit.