| 摘要 |
PROBLEM TO BE SOLVED: To provide a crescent lock unlocking sensor capable of preventing an unlocking of a crescent lock by an intruder by detecting an access of an improper magnet and by issuing a notification of the improper access.SOLUTION: The crescent lock unlocking sensor includes: a proper magnet 1 attached to a crescent rotation member 2; a radio transmission device 5 attached to an external frame member of a double sliding structure; a magnetism detection section 6 installed in the radio transmission device 5 for detecting a state of a magnetic flux; and a locking/unlocking determination section 7 that stores a state of the magnetic flux of the proper magnet 1 in a locked state of the crescent lock detected by the magnetism detection section 6, and compares the present magnetic flux detected by the magnetism detection section 6 and the stored magnetic flux by proper magnet 1 to determine whether the crescent lock is in the locked state and whether an improper magnet 30 other than the proper magnet accesses thereto. |
