| 摘要 |
PURPOSE: An infrared touch screen is provided to minimize the frame thickness of a touch screen and to improve the flatness and fixedness of a circuit board in the touch screen. CONSTITUTION: An infrared touch screen includes a touch panel(705), a bottom supporting component(704), a printed circuit board(703) at which infrared light-emitting tubes(701) and infrared light-receiving tubes(702) are installed, and a light transmission component(100). The light transmission component includes a light transmission body(101), first avoidance holes(102,103), and a light-collecting element(400). Second avoidance holes(706) for avoiding the locations of electronic devices arranged on the rear surface of the printed circuit board are prepared at the bottom supporting component. The bottom supporting component, printed circuit board, and light transmission body of the light transmission component are strongly connected in order to form a frame having a layered sandwich structure. The printed circuit board is located between the bottom supporting component and the light transmission body of the light transmission component. The first avoidance holes on the light transmission component accommodates the infrared light-receiving tubes and infrared light-emitting tubes on the front surface of the printed circuit board, and the second avoidance holes on the bottom supporting component accommodates the electronic devices located on the rear surface of the printed circuit board, and thereby enabling the light transmission component and bottom supporting component to strongly clamp the printed circuit board. |
