| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an antitheft device capable of judging whether or not a person is a thief and also motivating the thief not to commit a theft. SOLUTION: When a pyroelectric sensor 4 detects a person approaching, a controlling means 5 outputs warning sound from a speaker 1 that is made to perform an opening/closing operation by a motor 2 after the elapse of prescribed time of about 10 seconds so that a person who hangs around there for some time to attempt a theft can be distinguished from a passerby who soon walks away. In addition, the object (speaker) that is closed at the time when the object is first seen is automatically opened to generate the warning sound so that the person who looks at the object can be surprised to stop a theft attempt.</p> |
