DEVICE FOR MEASURING OPTICAL TRANSMISSION OF IR TOUCH BEZELS
Original Publication Date: 1990-Oct-31
Included in the Prior Art Database: 2004-Apr-05
Xerox Disclosure Journal
Infra-Red (IR) touch systems are commonly used as User Interfaces for machines incorporating CRT type display devices. The IR emitters and detectors are incorporated into the display devices using a specially designed CRT bezel surround. This bezel surround serves the purposes of: protecting the IR components from physical damage, keeping them free of dust and dirt, protecting the user from electric shock, and providing an aesthetically pleasing appearance. One of the most common bezel surround designs is manufactured using a polycarbonate material in an injection molding process. It is important in the manufacturing process to not only control dimensions and texture of the bezel surround, but also its optical characteristics. Unfortunately, while means exist to measure the raw material transmission of the IR spectrum and evaluate the aesthetic quality of the texture, there is no previously established method of measuring the optical performance of the textured bezel surround in a manner consistent with the application.