公开(公告)号：US09851224B2

公开(公告)日：2017-12-26

申请号：US14990937

申请日：2016-01-08

Applicant: MITUTOYO CORPORATION

Inventor： Satoshi Adachi ,  Youhei Toku ,  Toshihiro Hasegawa

IPC: G01D5/24 ,  G01D5/244 ,  G01D5/241

CPC classification number: G01D5/24419 ,  G01D5/2415

Abstract: A phase detector includes a sampling signal generator configured to generate a sampling signal at an edge of a scale signal, a counter configured to count up a count value according to a clock pulse every certain time and to output the count value at a timing instructed by the sampling signal, an edge polarity determinator configured to determine whether an edge polarity of the scale signal is a rising edge or a falling edge and to generate an adjustment signal when the polarity of the edge where the sampling signal is generated is a falling edge and an adjuster configured to add a predetermined adjustment amount to the count value output from the counter when receiving the adjustment signal.