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Automatic CRT Focus Adjustment

IP.com Disclosure Number: IPCOM000041558D
Original Publication Date: 1984-Feb-01
Included in the Prior Art Database: 2005-Feb-02

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Slager, SL [+details]


A method is described that permits rapid evaluation of the optimum focus adjustment in a CRT device. In a manufacturing environment, rapid optimization of CRT focus without human intervention is desirable to achieve a high degree of uniformity, high quality and throughput of finished products. Fig. 1 illustrates the overall block diagram of the focus adjustment scheme. The CRT display 1 will have displayed on its face any arbitrary pattern or characters from the pattern or character generator 2. Ordinary text characters can be employed, and no special format or pattern is required. The face of the CRT display is viewed by a video camera 3 focussed on the image plane for the CRT 1. An interface between the video camera 3 and a computer is shown as interface 4.