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Method for Self Calibrating Laser Slide Assembly Disclosure Number: IPCOM000045126D
Original Publication Date: 1983-Feb-01
Included in the Prior Art Database: 2005-Feb-06

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Grimm, CR [+details]


The laser slide assembly described in an earlier article (D. H. Brown, R. R. Grobe and P. J Schuster, "Self-Calibrating Slide Reference Position Sensor," IBM Technical Disclosure Bulletin 24, 7A 3153-3155 (December 1981) is calibrated by monitoring the voltage output of the proximity probe and calculating the slope of the voltage curve shown in Fig. 1. The point where the slope intersects the line where the voltage is unchanging is then taken as the reference point. This method is not able to maintain a 100 millionths tolerance. This is because for every slope change due to any reason, such as a change in temperature, there is a shift in the intersecting point, i.e., the reference point. The present method typically achieves a 16 millionths tolerance which is well within the 100 millionths tolerance limit.