| 摘要 |
PROBLEM TO BE SOLVED: To provide lighting system and a granular matter detector increasing contrast between scattered light from a spacer and reflected light from a wiring pattern for facilitating separation based on binarization between the spacer and a background. SOLUTION: The lighting system is provided with a light guide 1 as a light supplying means and a mirror 2 held so as to reflect light from the light guide 1. For detecting a spacer 7 as a granular matter, this lighting system radiates light beams 5 toward a desired detection position in at least two directions which are not orthogonal to any linear part of a wiring pattern in the view from the upper side and make an angle of 3 deg. or less with the upper face of a glass substrate 6.
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