Mcb Gmbh

Jean-Farie Renaud

Jacques A Taillebois

Paul Gambs

Jean-Claude Perrot

An analog position indicating optical encoder is provided including: an element (1) with a band (2) having a transparency which substantially is complete with respect to two wavelengths (1.sub.1 and 1.sub.2) but varies as a function of the angular or linear distance for a third wavelength (1.sub.3) at wavelength which is between the above-said two wavelengths (1.sub.1 and 1.sub.2); light emitting means (3.sub.1,3.sub.2,3.sub.3) emitting three light beams (7.sub.1,7.sub.2,7.sub.3) at the above said wavelengths (1.sub.1,1.sub.2,1.sub.3); a first optical coupler (5,6) mixing the beams (7.sub.1,7.sub.2,7.sub.3); optical bidirectional transmission means of the optical fiber type (B); a second optical coupler (18,19) dividing into three beams (20.sub.1,20.sub.2,20'.sub.3) the light leaving the means (B) after being reflected by the optical element (13) and after passing through the band (2); three readers (23.sub.1,23.sub.2,23.sub.3) responsive to the wavelength (1.sub.1,1.sub.2, and 1.sub.3); and an electronic unit (25) connected to the optical readers (23.sub.1,23.sub.2), and determining the ratio between the mean readers reading the wavelengths 1.sub.1 and 1.sub.2 corresponding to the wavelength 1.sub.3 the responses of 23.sub.1 and 23.sub.2 and the response of 23.sub.3.

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Courbevoie, France

Jean-Farie Renaud