| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an opening/closing device capable of preventing damage due to the excessive slide movement of a shutter curtain even in the case of using a magnetic sensor. <P>SOLUTION: The opening/closing device includes: an origin sensor 41 which is sensitive to a magnetic substance; a pulse generator 40 for generating pulses while a shielding body slides; a total-process counter 311 for counting the number of the pulses generated by the pulse generator 40; at least one arrival-time counter 312 for storing the counted number of the total-process counter 311 when an object to be detected, which is mounted at the closing-side end of the shutter curtain reaches in the detection range of the origin sensor 41; at least one passing-point counter 313 for counting the number of the pulses while the origin sensor 41 passes the detection range; and a correcting part 314 for correcting the counted number of the total-process counter 311 based on the counted number stored in the reaching-point counter 312 and the counted number of the passing-point counter 313. <P>COPYRIGHT: (C)2011,JPO&INPIT |
