Patent ID: 6837595

Claim:
A lighting system for surface inspection comprising a pair of light-emitting members disposed to form a flared shape widening toward a subject for inspection in side view, the pair of light-emitting members each comprising a plurality of LEDs arranged lengthwise and crosswise on a side thereof facing the subject for inspection, and cylindrical lenses disposed correspondingly to respective columns of the LEDs, wherein the positional relation between each of the LED columns and a corresponding one of the cylindrical lenses is established such that light emitted from LEDs belonging to each LED column is concentrated onto a given surface region of the subject for inspection; wherein optical axes of light emitted from LEDs belonging to each LED column are parallel; and wherein pitch between adjacent cylindrical lenses is smaller than pitch between adjacent LED columns such that the light emitted from the LEDs belonging to each of the LED column is concentrated onto a given surface region of the subject for inspection.