INFRARED RETROREFLECTING DEVICE USED FOR A HIGH-ASPECT-RATIO OPTICAL TOUCH PANEL, THE METHOD OF MANUFACTURING THE SAME AND A HIGH-ASPECT-RATIO TOUCH PANEL USING SUCH DEVICE
An infrared retroreflecting device used for a high-aspect-ratio optical touch panel, comprising an infrared retroreflecting stripe having a front surface, a back side and an elongated axis; the stripe being formed of a cube-corner retroreflecting structure having a primary groove and at least two secondary grooves; the primary groove being perpendicular to the elongated axis; and the stripe reflecting infrared emitted toward the front surface when an infrared incident angle is ranged from about 0° to about 61°. A method of manufacturing an infrared retroreflecting device used for a high-aspect-ratio optical touch panel, comprising forming a cube-corner retroreflecting sheet having a front surface, a back side, a first direction and a second direction, said first direction being perpendicular to the second direction, and cutting a retroreflecting stripe from said cube-corner retroreflecting sheet in the second direction. A high-aspect-ratio optical touch panel using the aforementioned infrared retroreflecting device is also disclosed.
