KEYBOARD HAVING CAPACITANCE-SENSITIVE KEY FIELDS
First Claim
1. A keyboard, comprising:
- a plurality of key fields;
a plurality of capacitive elements, wherein each capacitive element is associated with a key field and wherein each capacitive element is designed to change its capacitance value when actuating the key field associated with said element;
measuring electronics which are configured to measure the capacitance value of each of the capacitive elements;
wherein the measuring electronics are configured to detect a change of the capacitance value of one of the capacitive elements between a non-actuation level lying in a first capacitance value range and an actuation level lying in a second capacitance value range and then output an actuation signal in response thereto;
wherein the measuring electronics are further configured to detect a change of the capacitance value of the one capacitive element between the non-actuation level lying in the first capacitance value range and a manipulation level lying above the second capacitance value range and then output an alarm signal in response thereto.
1 Assignment
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Accused Products
Abstract
A keyboard having a plurality of key fields and a plurality of capacitive elements, which are associated with the key fields, and measuring electronics is proposed. The measuring electronics are implemented for the purpose of detecting a change of the capacitance value of one of the capacitive elements between a non-actuation level, which is in a first capacitance value range, and an actuation level, which is in a second capacitance value range, and then outputting an actuation signal. The measuring electronics are also implemented to detect a change of the capacitance value of the non-actuation level and a manipulation level above the second capacitance value range and to then output an alarm signal. The attempt to manipulate the keyboard can thus be detected on the basis of the capacitance value increase associated therewith.
61 Citations
11 Claims
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1. A keyboard, comprising:
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a plurality of key fields; a plurality of capacitive elements, wherein each capacitive element is associated with a key field and wherein each capacitive element is designed to change its capacitance value when actuating the key field associated with said element; measuring electronics which are configured to measure the capacitance value of each of the capacitive elements; wherein the measuring electronics are configured to detect a change of the capacitance value of one of the capacitive elements between a non-actuation level lying in a first capacitance value range and an actuation level lying in a second capacitance value range and then output an actuation signal in response thereto; wherein the measuring electronics are further configured to detect a change of the capacitance value of the one capacitive element between the non-actuation level lying in the first capacitance value range and a manipulation level lying above the second capacitance value range and then output an alarm signal in response thereto. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification