DEFECT INSPECTING APPARATUS FOR IR FILTER WITH AUTOMATIC FOCUS CONTROL UNIT

摘要

The present invention relates to a lens inspecting apparatus with an automatic focal distance control function. The present invention uses a prior focusing state which is stored when a current focusing state is operated after the prior focusing state is stored, in the control of a focal distance of an objective lens part unlike an existing automatic focusing module. In comparison with an existing automatic focal distance control function, the present invention photographs a clear surface image by quickly dealing with an external impact like a high frequency vibration due to a peripheral device.