US Patent 9746057 Drive mechanism for OPTO-mechanical inspection system

A drive mechanism to move an optical component sensitive to particles is described. The drive mechanism has high precision in rotation, great reliability and durability life, no backlash, and far less particle contamination. The drive mechanism can be advantageously used in high precision rotation driving processes for opto-mechanical inspection systems that require high movement precision and no-contamination. In one embodiment, two pulleys are used with their axes to be parallel from each other, two bands are used to rotate the pulleys in opposite directions. An eccentric disk mechanism is used to fine-tune the distance between the two pulleys so that tensions on the two bands can be optimized.