| 摘要 |
A measuring instrument has a phase signal transmitter ( 400 ) that transmits, in accordance with a rotation of the spindle ( 300 ), a phase signal that differs corresponding to the rotation angle of the spindle ( 300 ), and an arithmetic processor ( 500 ) that arithmetically processes the phase signal to obtain the absolute position of the spindle. The phase signal transmitter transmits the phase signal at a predetermined pitch. Since the phase signal differs corresponding to the rotation angle of the spindle ( 300 ), a rotation angle of the spindle ( 300 ) is uniquely determined by the phase signal. Unlike an increment type measuring instrument, since-there is no concern that the signal will be skip-read, the spindle ( 300 ) can be rotated at high speed, so that operational performance of the micrometer ( 100 ) can be improved. Further, since there is no concern that the signal will be skip-read, the phase signal can be minutely varied with respect to the rotation of the spindle ( 300 ).
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