Importance

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Abstract

The light sensor has a light transmitter (10, 12) which radiates the light along an axis (x.sub.0) of a transmitter system and two light receiving systems (12, 14) which pick up the light scattered back from an object (G) to be detected along a receiving system axis (x.sub.1, x.sub.2). A light sensitive element (16) has three detection zones (El.sub.T, E.sub.H, E2.sub.T) arranged in a row of which the outer zones (E1.sub.T and E2.sub.T) each receive light via one of the receiving systems (12, 14) from a sensing zone (T) and of which the central detection zone (E.sub.H) accepts light via both light receiving systems from the background region (H) of the field of view of the light sensor. An output signal which is used for object recognition is obtained by additive superposition of the signals of the detection zones (E1.sub.T, E2.sub.T) associated with the scanning region (T) and by difference formation with the signal from the detection zone (E.sub.H) associated with the background region (H). The sensing distance (TW) is adjusted by adjusting a roof edge mirror (18) arranged in front of the light sensitive element (16).

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First Claim