To provide a lock crime prevention device capable of taking a countermeasure for crime prevention by an easy installation method of the after-fitted device without changing a door lock by positively determining an intruder even in the case of breaking the lock or having no data of an information card by the independence of a data reading part for the information card and according to door unlocking conditions and door opening conditions.
The lock crime prevention device has the reading part 10 mounted around a keyhole of the lock to read a radio or electromagnetic induction type non-contact information card 20; a determining part 11 confirming data of the information card 20 and determining whether it is normal; an unlocking signal input part 12 inputting a lock unlocking signal; a door opening signal input part 17 detecting the open state of a door; and an intruder detecting part 14 for determining the intruder or not from either input signal out of signal input of the unlocking signal input part 12 and a door opening signal of the door opening signal input part 17 and also from a determined result from the determining part 11.
KASHIMOTO TAKASHI
Tomoyasu Sakaguchi
Hiroki Naito