System and method for optical encoding on two opposed surfaces of a pattern medium
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United States of America Patent
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Mar 25, 2008
Grant Date -
Dec 21, 2006
app pub date -
Jun 17, 2005
filing date -
Jun 17, 2005
priority date (Note) -
Expired
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Abstract
An optical encoder system is disclosed with a single pattern medium having a first coded pattern disposed on the first side, a second coded pattern disposed on the second side, a first optical encoder disposed toward the first side, and a second optical encoder disposed toward the second side. An optical encoder device is disclosed with a first coded pattern disposed on the first side, and a second coded pattern disposed on the second side. There is disclosed a method for using an optical encoder device to obtain information related to a motor which includes the steps of illuminating a first coded pattern disposed on a first side of a pattern medium, illuminating a second coded pattern disposed on a second side of the pattern medium, detecting light reflected from the first side, detecting light reflected from the second side, and analyzing the reflected light.
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