| 摘要 |
<p>PROBLEM TO BE SOLVED: To surely detect the breakdown of a window glass with a small number of parts. SOLUTION: An infrared transmitter 2 which makes infrared rays incident on a window glass 1 and an infrared receiver 3 which receives a reflected wave of infrared rays emitted from the window glass 1 are arranged in mutual adjacent positions so that they may be brought into contact with the window glass 1, and the breakdown of the window glass 1 is discriminated by a discrimination means 4 based on the reception level of the infrared reflected wave in the infrared receiver 3; and if the breakdown of the window glass 1 is discriminated by the discrimination means 5, it is reported by a report means 5.</p> |
