Capacitative device for measuring lengths and angles

Claim 1

A capacitative device for measuring lengths and angles, comprising a first part (2) and a second part (1), arranged in a sliding manner in the direction of displacement and measuring of the one part with respect to the other, the first part (2) carrying elongated emitting electrodes (10), disposed perpendicularly to the said direction to form a series and at least two receiving electrodes (19, 20) arranged laterally on each side of this series, the second part (1) being provided with coupling electrodes (6, 7), facing the emitting electrodes (10) and receiving electrodes (19, 20), and an electronic assembly (50), arranged to measure the relative displacement of the two parts through capacitative coupling by means of coupling electrodes (6, 7) between emitting electrodes (10) and receiving electrodes (19, 20), characterized in that the coupling electrodes (6, 7) are made by alternating L-shaped electrodes (6) and inverted L-shaped electrodes (7), interlocking themselves one into the other so that, except for the end electrodes, the vertical part (40) of each L-shaped electrode (6) is sandwiched between the vertical parts (40) of inverted L-shaped electrodes (7) and the vertical parts 40 of each inverted L-shaped electrode (7) is sandwiched between the vertical parts (40) of L-shaped electrodes (6), and so that the vertical parts (40) of the L-shaped and inverted L-shaped electrodes alternate and are closely adjacent each other and also are arranged to face the emitting electrodes (10), and wherein the horizontal parts (41) of the L-shaped electrodes are positioned closely adjacent each other and are arranged to face one of the receiving electrodes (19, 20) while the horizontal parts (41) of the inverted L-shaped electrodes are arranged to face the other of the receiving electrodes (19, 20).