| 摘要 |
A transit includes a first rotational member provided with a collimator and supported on the transit for rotation about a predetermined axis, a second rotational member supported on the transit for rotation about the predetermined axis, a detector for generating a pulse in accordance with a predetermined angle of displacement between the first rotational member and the second rotational member, a first counter for counting the number of pulses from the detector, the maximum countable pulse number of the first counter corresponding to the angle of 360 DEG , the first counter generating a pulse in accordance with its counting of the maximum pulse number, and a second counter for counting the pulses from the first counter means up to a predetermined number.
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