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In tribology, a contact condition between mating surfaces is very important to reduce friction and raise their lifetime. Direct observation of apparent contact area is necessary for a better understanding of the contact condition. We examined the distribution of real contact area between a platen rubber roller and a glass plate using a laser microscope with wide field of view. Based on these observations, the distribution of real contact area ratio, which is the ratio of real contact area to the apparent contact area at each point, was calculated. Micro-slips over the whole apparent contact area were measured with several torques applied to the platen roller. The relationship between real contact area ratio and micro-slips on the contact area are discussed.

Observation of Real Contact Area Using Laser Microscope with Wide Field of View