System and method for detecting defects in a...

Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet

Reexamination Certificate

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C250S559110, C250S208100, C356S237100

Reexamination Certificate

active

10710708

ABSTRACT:
A system and a method for detecting defects in a light-management film are provided. The system includes a first light source configured to emit light onto a first side of the film in a first predetermined region of the film. The system further includes a second light source configured to emit light onto a second side of the film in the first predetermined region of the film. The system further includes a first camera configured to receive a first portion of light reflected from the first predetermined region of film from the first light source and a second portion of the light propagating through the film from the second light source. Finally, the system includes a signal-processing device operably coupled to the first camera configured to detect a defect in the first predetermined region of the film based on at least one of the first and second portions of light.

REFERENCES:
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patent: 5598006 (1997-01-01), Stringa
patent: 5598262 (1997-01-01), Jutard et al.
patent: 5691811 (1997-11-01), Kihira
patent: 6040584 (2000-03-01), Liu et al.
patent: 6960777 (2005-11-01), Soar
patent: 7030400 (2006-04-01), Rivera et al.

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