Geometrical instruments – Distance measuring – Scale reading position sensor
Reexamination Certificate
2006-11-06
2009-12-01
Smith, R. A. (Department: 2841)
Geometrical instruments
Distance measuring
Scale reading position sensor
C033S707000
Reexamination Certificate
active
07624513
ABSTRACT:
A method of calibrating a scale measurement apparatus. A scale has scale markings arranged to form an incremental pattern and at least one scale mark. A readhead has an incremental detector means which produces an output signal and a scale mark detector means for producing a signal having a zero crossing. The readhead is moved relative to the scale. The output from the incremental detector is used to determine a predetermined phase in the output signal and the value of the signal from the scale mark detector corresponding to the predetermined phase in the output signal from the incremental detector on either side of the zero crossing is determined. These values are used to define the width of the scale mark pulse.
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Oliff & Berridg,e PLC
Renishaw PLC
Smith R. A.
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