Measurement of a CRT Monitor Bezel Datum
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
This article describes a technique for determining the "center of the corner circle" on a monitor CRT (cathode ray tube) bezel which is used as a reference point for front-of-screen (FOS) geometry measurements, particularly tilt and orthogonality. Monitor engineering specifications require a display datum for measuring the active raster tilt (screen orientation). The specification typically requires that the level line for measuring active raster tilt is made using the radius of the bezel corners, sometimes using the term "center of the corner circle." One has to determine this center of the circle formed by the curved corner of the bezel opening which is then used as a reference for FOS geometry measurements. Since the specification for active raster tilt is +/- 0.