Patent ID: 6783257
Filing Date: 2004-08-31
Classification: G01N,G02B

Abstract:
A lighting apparatus for inspection of an object, comprising:a) a large number of light emitters arranged in a circle in a horizontal plane above the object to be inspected; and b) a light guiding means arranged inside the circle of the light emitters for downwardly directing a part of light emitted from the light emitters to the object to be inspected for reflection therefrom, and upwardly passing light reflected by the object to be inspected, the light guiding means comprising a flat and transparent light guiding plate having opposite sides and provided with a large number of reflecting portions on at least one of the sides, both sides of the light guiding plate extending in parallel with the horizontal plane, the reflecting portions being arranged with a distance therebetween for downwardly directing the part of the light emitted from the light emitters, the light guiding means allowing the light reflected by the object to be inspected to pass through apertures among the reflecting portions.