| 摘要 |
PROBLEM TO BE SOLVED: To provide an increment type displacement measuring instrument, capable of aligning reference positions (origin positions), when positioning from a going direction and when positioning from a returning direction, in reference positioning (origin positioning) for incremental measurement. SOLUTION: In a reference positioning operation for an optical encoder concerned in this increment type displacement measuring instrument, a counter circuit is zero-set using a reference signalψR2 as a trigger in the going direction (S1); where as the counter circuit is zero-set, by using a reference signalψR3 which becomes active with a lag to the reference signalψR2, as a trigger, in the returning direction (S2). COPYRIGHT: (C)2006,JPO&NCIPI
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