VISUAL INSPECTION DEVICE

A visual inspection device including a pinhole lens optically coupled to a sensor is provided. The pinhole lens has a pinhole placed at the distal end of the lens to capture the rays from an object to be inspected, a front optical group receiving the rays which cross the pinhole, and a rear optical group. The front optical group is configured to focus, on the rear optical group, the rays which cross the pinhole. The rear optical group is configured to focus, on the sensor, the rays received from the front optical group.