OPTICAL DETECTION DEVICE FOR A COUNTER

摘要

The invention relates to an optical detection device for a counter, comprising a consumption indicator, formed from a rotating disc (4), provided with at least one section called active and optical elements of the emitter type and receiver type, opposite said disc, the received optical signal from which is used to infer the number of rotations of said disc. According to the invention, said disc (4) comprises at least three sectors (4A, 4B, 4C) with a central angle of 120, each sector being covered on the face thereof facing the outside of the counter (1) with a different colour. Said optical elements comprise at least one emitter element (6), emitting a beam of light with at least two different colours ands a receiver element (7) for a reflected light beam.