Based on the virtual light-pen,a new type of light-pen structure was built by analyses of the system model's feature.The light-pen adopted in the system had ten control points,and supposed the distance between the front plane where six control points laid and the back plane where other four ones did as D_(FB).The CMM's main axis could move with high accuracy and stability,then virtual light-pens with different values of D_(FB) were built.The structure model for the virtual light-pen was given in detail.And ...
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