Browse Prior Art Database

Measurement of a CRT Monitor Bezel Datum

IP.com Disclosure Number: IPCOM000034255D
Original Publication Date: 1989-Jan-01
Included in the Prior Art Database: 2005-Jan-27
Document File: 2 page(s) / 49K

Publishing Venue

IBM

Related People

Leise, LE: AUTHOR

Abstract

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.

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Measurement of a CRT Monitor Bezel Datum

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 +/- 0.5 degree, it is necessary to measure the reference with as little error as possible. The new technique uses a cylindrical gage to mark all four corners of the bezel to establish the level reference line. The technique is as follows: 1. Select a gage that approximates the bezel corner radius but is a minimum of 2X greater. 2. Place transparent tape on the CRT in the general area that the gage will mark. 3. Place the marker gage in the corner of the bezel and tap the stylus marking the transparent tape. This mark is then used as the reference point for measuring FOS geometry. 4. Repeat the operation for the remaining corners. This technique does not actually deter...