Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2006-05-30
2006-05-30
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C356S004080, C356S624000, C369S044110
Reexamination Certificate
active
07053394
ABSTRACT:
Two light beams are incident on the same position on a surface of an object (105) to be measured obliquely from upper sides facing each other, and positions at which the reflecting light beams are incident on respective predetermined detection surfaces are detected by position detectors (102and104) for outputting respectively as position detection signals. The displacement of the surface to be measured is detected by obtaining the difference between or the sum of respective position detection signals so as to cancel the components in the directions opposite to each other out of the components indicating changes from the reference position included in respective position detection signals.
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Hamre Schumann Mueller & Larson P.C.
Monbleau Davienne
Porta David
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