FILTER FOR PHOTOELECTRIC TOUCH PANEL

摘要

PURPOSE:To reduce the number of component parts and manufacturing processes by using a filter set in front of each optical element of an array also as a lens and therefore eliminating the need to prepare newly a lens. CONSTITUTION:Arrays 1a-1d are provided frame-like around the screen of a display. The light emitting diodes LED2 are set to arrays 1a and 1b with fixed spaces. While phototransistors TR3 are set to arrays 1c and 1d and opposite to the LED2. A filter 4 is provided in front of arrays 1a-1d, the LED2 and the TR3 respectively. Then the hemispherical photodetecting parts 5 are formed to the filter 4 an opposite to those LED2 and TR3 respectively. Here a lens function is provided to the filter 4. As a result, a lens is not needed separately. This reduces the number of component parts and manufacturing processes of a photoelectric touch panel.