| 摘要 |
A lighting device for apparatus detecting flaws in objects having a photoelectric sensor aligned with the object and a processor responsive to the sensor for determining the light received by the sensor. The lighting device includes a ring-shaped lamp and an opaque shield having predetermined light paths controlling the direction of the light from the lamp in a selected direction, so that the light irradiates the object to be inspected in a manner whereby the light is reflected from the object to the sensor only when the object is flawed.
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