| 摘要 |
<p>The lighting device of the present invention includes a regular ring shape lamp and a means of simple construction that controlls the direction of the light from the lamp to a predetermined direction, so that the light irradiates a predetermined part of an object to be inspected. Thus, it is used as the lighting device for an automatic inspection system for round edge portions of a circuilar shape, so that the photoelectric conversion sensor and inspection section constructions may be simplized while at the same time the detection sensitivity can be raised.</p> |
