INPUT DEVICE AND POSITION DETERMINING METHOD
First Claim
1. An input device (10), comprising:
- a contact plate (12) which comprises a contact surface (14) and is at least partially coated with an electrical resistive layer (16) on a surface facing away from the contact surface (14), the electrical resistive layer (16) comprising at least two electrically conducting contacts (18),and a measuring circuit (20) for measuring a sensing capacitor (24) formed by the electrical resistive layer (16) and an electrostatically chargeable object (22) arranged at a contact position on the contact surface (14),a processing unit being provided with which coordinates (X, Y) of the contact position of the electrostatically chargeable object (22) on the contact surface (14) can be determined by determining the ohmic resistances (R1, R2, R3, Rn) between the contact position of the electrostatically chargeable object (22) and the electrically conducting contacts (18).
1 Assignment
0 Petitions
Accused Products
Abstract
An input device (10) has a contact plate (12) having a contact surface (14) and being least partially coated with an electrical resistive layer (16) on a surface opposite the contact surface (14). The electrical resistive layer (16) has at least two electrically conducting contacts (18). A measuring circuit (20) is provided for measuring a sensing capacitor (24) formed by the electrical resistive layer (16) and an electrostatically chargeable object (22) arranged at a contact position on the contact surface (14). Further, a processing unit is provided for determining coordinates (X, Y) of the contact position of the electrostatically chargeable object (22) on the contact surface (14) by means of a determination of the ohmic resistances (Rn) between the contact position of the electrostatically chargeable object (22) and the electrically conducting contacts.
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Citations
11 Claims
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1. An input device (10), comprising:
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a contact plate (12) which comprises a contact surface (14) and is at least partially coated with an electrical resistive layer (16) on a surface facing away from the contact surface (14), the electrical resistive layer (16) comprising at least two electrically conducting contacts (18), and a measuring circuit (20) for measuring a sensing capacitor (24) formed by the electrical resistive layer (16) and an electrostatically chargeable object (22) arranged at a contact position on the contact surface (14), a processing unit being provided with which coordinates (X, Y) of the contact position of the electrostatically chargeable object (22) on the contact surface (14) can be determined by determining the ohmic resistances (R1, R2, R3, Rn) between the contact position of the electrostatically chargeable object (22) and the electrically conducting contacts (18). - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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Specification