Appearance inspection system, image processing device, setting device, and inspection method

An appearance inspection system that performs appearance inspection by imaging a target using an imaging device while causing a relative position of the imaging device with respect to the target to be different along a designation route,

• wherein the imaging device includes a lens module with a variable focus position, the lens module comprises a focus position adjustment lens and a zoom adjustment lens group, and the focus position adjustment lens and the zoom adjustment lens group are sequentially disposed on a transmission path of a light reflected from the target on the imaging device,
• wherein the appearance inspection system comprises:
• a decision part that decides a plurality of relative position candidates of the imaging device with respect to the target at which focus of the lens module is possible on an inspection target position with regard to each of a plurality of inspection target positions on the target;
• a selection part that selects relative positions one by one from corresponding plurality of relative position candidates for each of the plurality of inspection target positions and selects a route candidate satisfying a preset requirement from a plurality of route candidates generated by sequentially connecting the plurality of selected relative positions as the designation route;
• and
• a lens control part that controls the lens module such that a focus position is changed in accordance with the plurality of inspection target positions when the relative position of the imaging device is caused to be different along the designation route.