Apparatus and method for inspecting light transmittable...

Details Apparatus and method for inspecting light transmittable... Apparatus and method for inspecting light transmittable...

2005-05-24

2005-05-24

Smith, Zandra (Department: 2877)

Optics: measuring and testing

By monitoring of webs or thread

For flaws or imperfections

C356S443000, C250S559020

Reexamination Certificate

active

06897958

ABSTRACT:
In an inspection device, an inspection light projector and an auxiliary light emitter respectively project an inspection light and auxiliary light onto a position of a filmstrip. After transmitting the filmstrip, the inspection light is received by a defect detector. When receiving the inspection light, the defect detector generates a data signal and sends it to a controller. In the controller, a threshold of a level of the data signal is memorized, and the level of the data signal is compared with the threshold. If the level of the data signal becomes under the threshold, the controller determines that the filmstrip has a coloring defect. Further, if there is a dust on the filmstrip, the level of the data signal becomes higher. Because the auxiliary light is diffused by the dust, and a part of the auxiliary light is received by the defect detector.

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