Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2005-04-12
2005-04-12
Luu, Thanh X. (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C250S559140, C356S496000
Reexamination Certificate
active
06878953
ABSTRACT:
The present invention teaches a method and apparatus for making measurement of an object on a machine, such as a machine tool, using an optical measuring apparatus which includes a light source for generating a beam of light which is incident on a detector. A detection signal is generated within the detector each time the beam is interrupted. The duration and/or frequency of the detection signals are evaluated and an output signal is emitted from the detection only if a further detection signal is present within the detector in a specified time interval from the generation of an earlier detection signal.
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Bell Colin T
Davies William K
Fuge Jon P
Leete Norman J
Stimpson Victor G
Luu Thanh X.
Oliff & Berridg,e PLC
Renishaw PLC
Sohn Seung C.
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