SENSOR USING THE CAPACITIVE MEASURING PRINCIPLE
First Claim
1. A sensor using a capacitive measuring principle for detecting an approaching dielectric medium, such as a human body part, said sensor being adapted for use in an anti-pinching system, and comprising:
- a capacitor and an evaluation electronic system, wherein a variation of a capacitance of the capacitor caused by the dielectric medium can be measured, and wherein the capacitor can be operated in succession using at least two different frequencies and/or at least two different pulse duty factors.
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Accused Products
Abstract
The invention relates to a sensor which uses the capacitive measuring principle which is used to detect the proximity of a dielectric medium, preferably for detecting a human body part, which is used in an anti-pinching system. Said sensor comprises a capacitor and an evaluation electronic system. The variation of the capacity of the capacitor, which is caused by the medium, can be measured. Said capacitor, which can establish a distinction between a human body part or a solid and water and/or humidity, is characterized in that the capacitor can be operated in a successive manner by at least two different frequencies and/or at least two different pulse duty factors by using the different ratio of said elements in a variable electric field. The invention also relates to a corresponding method.
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Citations
22 Claims
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1. A sensor using a capacitive measuring principle for detecting an approaching dielectric medium, such as a human body part, said sensor being adapted for use in an anti-pinching system, and comprising:
a capacitor and an evaluation electronic system, wherein a variation of a capacitance of the capacitor caused by the dielectric medium can be measured, and wherein the capacitor can be operated in succession using at least two different frequencies and/or at least two different pulse duty factors. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A method for detecting an approaching dielectric medium, such as a human body part, said method being adapted for use in an anti-pinching system, and comprising:
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providing a capacitor and an evaluation electronic system; and
measuring with a sensor a variation of a capacitance of the capacitor caused by the dielectric medium, wherein the capacitor is operated in succession using at least two different frequencies and/or at least two different pulse duty factors. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20, 21, 22)
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Specification