| 摘要 |
PROBLEM TO BE SOLVED: To widen a light quantity alteration and regulation range of a projection member by reducing troublesome works such as replacement of a light emitting member and reduce size of an apparatus by miniaturizing the projection member. SOLUTION: A defective detection apparatus has a light receiving means 5 for receiving light from a presence scheduled part where a group of particles are scheduled to be present, a projection member 8 arranged at a back-part side portion and projecting light toward the light receiving means 5, and a discrimination means for discriminating the presence of a defective when a light quantity value of a light accepting quantity is beyond an appropriate light quantity range with respect to detected light from a normal article. The projection member 8 has a plurality of LED light emitting elements arranged along the direction of the lateral width of the presence scheduled part and a diffuser plate for diffusing the light emitted by the plurality of LED light emitting elements so as to freely alter and adjust the light emitting quantity of the plurality of LED light emitting elements. COPYRIGHT: (C)2004,JPO
|
