| 主权项 |
1. An optical touch device adapted to be used with a touch surface and comprising:
a control unit; and first to fourth optical capturing units coupled to the control unit and disposed on a side of the optical touch device close to the touch surface to obtain at least one piece of optical sensing information, wherein the first and second optical capturing units are disposed in a first region and the third and fourth optical capturing units are disposed in a second region, and the touch surface is divided into a first sub-touch area, a second sub-touch area, and a third sub-touch area according to positions of the first region and the second region, wherein the first and third optical capturing units face the first sub-touch area, the second and third optical capturing regions face the second sub-touch area, and the second and fourth optical capturing units face the third sub-touch area, wherein the control unit calculates at least one touch point in the touch surface based on a plurality of pieces of optical sensing information captured by the first to fourth optical capturing units, each of the first to fourth optical capturing units is respectively disposed at a predetermined distance from the touch surface and arranged at a predetermined angle, a touch covering area of each of the first to fourth optical capturing units is obtained based on the predetermined distance and the predetermined angle, and the touch covering area is positively correlated to the predetermined distance. |
