Pointer tool
This invention relates to a pointer tool for connecting to a display device, comprising a number of sensors elements being positioned on a two-dimensional surface, for measuring a predetermined parameter at a surface, the measured quantity being sampled at a chosen rate, and calculating means for comparing the measurements from the sensor elements for detection of movements in two dimension over the elements based on changes in the measured parameter, the time between the changes and the known relative positions between the sensor elements.
1. Pointer tool for connecting to a display device, comprising:
a plurality of sensor elements, positioned on a two-dimensional surface to form at least one linear image array and at least one per pendicular linear speed correction array, to measure the movement of a fingertip surface at a chosen sample rate,
storing means to store the measurements from each sensor element over time to create a sample history for each sensor element, and
calculating means to calculate the speed of the fingertip surface based on the respective sample histories and relative positions of the plurality of sensor elements.
2. Pointer tool according to claim 1 , wherein said calculating means is further adapted to compare the most recent samples of each sensor element with the sample history of a chosen number of the other sensor elements to calculate the velocity and direction of the fingertip surface relative to the plurality of sensor elements.
3. Pointer tool according to claim 1 , wherein the linear image array defines a linear finger scanner.
4. Pointer tool according to claim 1 , wherein the sensor elements define two perpendicular pairs of sensor element arrays.
5. Pointer tool according to claim 1 , further comprising a display device coupled to the calculating means for indicating the measured movements on the display.
6. Pointer tool according to claim 1 , wherein at least one sensor element is adapted to respond to measured values exceeding a predetermined value to sense the presence of the fingertip surface.
7. Pointer tool according to claim 6 , wherein further comprising means for measuring the time of the presence of the fingertip surface and the time between the responses, so as to recognize taps, or double taps on the plurality of sensor elements.
8. Pointer tool according to claim 1 , consisting of one linear image array, one parallel speed correction array and two perpendicular sensor arrays.
9. Pointer tool for connecting to a display device, comprising:
a plurality of sensor elements, positioned on a two-dimensional surface with known distances between the sensor elements, adapted to measure a predetermined parameter of a finger surface at a chosen rate, a first portion of the plurality of sensor elements forming a linear fingerprint sensor array and a remaining portion of the plurality of sensor elements being displaced from the linear fingerprint sensor array in a perpendicular direction;
storing means for storing the measurements from each sensor element to provide a set of samples from each sensor element; and
calculating means for comparing the samples from each sensor element with the samples from other sensor elements and for calculating the movement of the finger surface in two dimensions based on finger direction and speed.
10. Pointer tool for connecting to a display device, comprising:
a plurality of sensor elements, positioned on a two-dimensional surface to form a matrix fingerprint scanner, to measure the movement of a fingertip surface at a chosen sample rate,
storing means to store the measurements from each sensor element over time to create a sample history for each sensor element, and
calculating means to calculate the direction and speed of the fingertip surface based on the respective sample histories and relative positions of the plurality of sensor elements.