Navigation tool
This invention relates to a navigation tool for connecting to a display device, comprising at least two sensor elements having known positions relative to each other, each sensor element being coupled to detector means for recording a change in a predetermined parametre and timing means for determining the time of change at each sensor element and calculating means for calculating the direction and speed of the recorded changes based on the relative positions of the sensor elements and the duration between the recorded changes.
1. Navigation tool related to a fingerprint sensor having an array of image sensor elements for detecting features of a fingerprint, said navigation tool comprising at least two navigation sensor elements having known positions relative to each other, each navigation sensor element being coupled to detector means for recording a change in a predetermined parameter and timing means for determining the time of change at each navigation sensor element and calculating means for calculating the direction and speed of the recorded changes based on the relative positions of the navigation sensor elements and the duration between the recorded changes wherein the navigation sensor elements are larger than the image sensor elements.
2. Navigation tool according to claim 1 , wherein a recorded time of change at a navigation sensor element is related to exceeding a predetermined threshold.
3. Navigation tool according to claim 1 , also comprising a display device coupled to the calculating means for indicating measured changes on the display.
4. Navigation tool according to claim 1 , wherein the predetermined parameters measured by the navigation sensor elements are sampled at chosen intervals, measured predetermined parameter values being compared to chosen thresholds, and recorded times of change at a navigation sensor element being equivalent with the sample number at the recording.
5. Navigation tool according to claim 1 , wherein duration of a change in a predetermined parameter exceeding a threshold is recorded.
6. Navigation tool according to claim 1 , wherein the navigation sensor elements are related to a finger scanner, being adapted to measure features of a finger surface in the vicinity of the image sensor elements.
7. Navigation tool according to claim 6 , wherein a measured parameter is capacitance of a finger close to the image sensor elements.
8. Navigation tool according to claim 1 , wherein the calculated direction and speed is compared to a range of acceptable values.