Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2005-03-01
2005-03-01
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S559450
Reexamination Certificate
active
06861659
ABSTRACT:
A laser beam L from a laser2is introduced from an introducing surface into a transparent substrate1by using mirrors31and32.The laser beam introduced through the transparent substrate1repeats a total reflection on the surfaces (main surfaces and end surfaces) of the transparent substrate1and enters a state in which the laser beam is almost confined in the substrate1.When an ununiform portion such as a scratch exists on the surface of the transparent substrate1, however, total reflecting conditions are not satisfied and the light leaks out of the ununiform portion. The leaked light is formed as an image on a CCD6by a lens system7and an image process is executed by an image processing apparatus12.In a detected image, the ununiform portion in which the scratch or the like exists is brightly seen in a linear or a dot form in a black background, so that the ununiform portion such as a very fine scratch can be detected.
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Cook Alex McFarron Manzo Cummings & Mehler, Ltd.
Hoya Corporation
Le Que T.
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