Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2006-12-12
2008-10-14
Le, Que T. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S208100
Reexamination Certificate
active
07435986
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 openably 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: 5691811 (1997-11-01), Kihira
patent: 6040584 (2000-03-01), Liu et al.
patent: 6774986 (2004-08-01), Laskowski
patent: 6960777 (2005-11-01), Soar
patent: 7030400 (2006-04-01), Rivera et al.
Capaldo Kevin Patrick
Cheverton Mark
Harding Kevin George
Tait Robert
Bui-Pho Pascal M
Cantor & Colburn LLP
Le Que T.
Sabic Innovative Plastics IP B.V.
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