Encoder scale writing or calibration at an end-use...

Details Encoder scale writing or calibration at an end-use... Encoder scale writing or calibration at an end-use...

2007-07-27

2008-10-07

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

C250S234000, C250S208100, C356S614000, C356S617000, C382S278000

Reexamination Certificate

active

07432496

ABSTRACT:
A method for writing or calibrating the scale of a scale-based position encoder. The scale is installed where it will be used to provide ongoing position measurements for a host system. The image correlation sensor is temporarily mounted proximate to the mounting position of the scale-based position encoder readhead on the host system, and is moved along the measuring axis relative to the scale, to provide corresponding displacement measurement information. The displacement measurement information is used to govern a scale writing process or a calibration process for the scale-based position encoder, such that the displacement measurement information at least partially governs the values of respective ongoing position measurements provided by the scale-based position encoder at respective positions along the measuring axis. A two-axis image correlation displacement sensor is advantageously used to detect and/or corrected various potential errors during the calibration or writing process.

REFERENCES:
patent: 485545 (1892-11-01), Holt
patent: 4950890 (1990-08-01), Gelbart
patent: 6664506 (2003-12-01), Clauer
patent: 6873422 (2005-03-01), Nahum
patent: 6955412 (2005-10-01), Hin
patent: 7065258 (2006-06-01), Nahum
patent: 7085431 (2006-08-01), Jones
patent: 2003/0024658 (2003-02-01), Nahum
patent: 2007/0051884 (2007-03-01), Romanov

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