CAPACITIVE SENSOR, METHOD FOR READING OUT A CAPACITIVE SENSOR FIELD AND METHOD FOR PRODUCING A CAPACITIVE SENSOR FIELD
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Abstract
A capacitive sensor (20) includes a capacitive sensor field (2), the capacitive sensor field (2) having a plurality of discrete electrodes (4) which are coupled to discrete leads (8). The leads (8) of a first electrode (41) are guided such that they are capacitively coupled with at least one second electrode (42). A first signal (Cm1) is detected at a first lead (8) which is coupled with the first electrode (41), and a second signal (Cm2) is detected at a second lead (8) which is coupled with a second electrode (42). The capacity (Cf1, Cf2) of the first electrode (41) or of the second electrode (42) is determined using a predetermined calculation formula which takes the first signal (Cm1), the second signal (Cm2) and the capacitive coupling between the second electrode (4) and the first lead (8) coupled with the first electrode (41) into account.
20 Citations
20 Claims
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1-10. -10. (canceled)
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11. A method of reading out a capacitive sensor field (2) having a plurality of discrete electrodes (4), wherein each electrode (4) of the capacitive sensor field (2) is connected with a respective discrete lead (8) which extends from the respective electrode (4) up into a connection area (10) of the sensor field (2) and through which the one capacity (Cf1, Cf2, Cf3) of the respective electrode (4) can be read out, wherein the plurality of electrodes (4) of the sensor field (2) comprises at least one first electrode (4) the lead (8) of which is guided such that the lead (8) is capacitively coupled with at least one second electrode (42), wherein the method of reading out the capacitive sensor field (2) comprises the following steps:
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a) detecting a first signal (Cm1) at a first lead (8) connected with the first electrode (41), and detecting a second signal (Cm2) at a second lead (8) connected with the second electrode (42), b) determining the capacity (Cf1, Cf2) of the first electrode (41) or of the second electrode (42) using a predetermined calculation formula which takes the first signal (Cm1), the second signal (Cm2) and the capacitive coupling between the second electrode (42) and the first lead (8) which is coupled with the first electrode (41) into account. - View Dependent Claims (12, 13, 14)
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15. A capacitive sensor (20), comprising an evaluation unit (22) and a capacitive sensor field (2) having a plurality of discrete electrodes (4), wherein each electrode (4) is connected with a respective discrete lead (8) which extends from the respective electrode (4) up into a connection area (10) and through which a capacity (Cf1, Cf2) of the respective electrode (4) can be read out, wherein the sensor field (2) comprises at least one first electrode (41) the lead (8) of which is guided such that the lead (8) is capacitively coupled with at least one second electrode (42), and wherein the evaluation unit (22) is designed
a) to detect a fist signal (Cm1) at a fist lead (8) which is connected with the first electrode (41), and a second signal (Cm2) at a second lead (8) which is connected with the second electrode (42), and b) to determine the capacity (Cf1, Cf2) of the first electrode (41) or of the second electrode (42) using a calculation formula, the first signal (Cm1) and the second signal (Cm2) and the capacitive coupling between the second electrode (42) and the lead (8) of the first electrode (41) being taken into account in this predetermined and stored calculation formula.
Specification