| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a heat detector which does not make an antenna for radio transmission of a fire signal conspicuous and does not require a complicated processing and assembling of the antenna, and further, is less likely to cause a radio wave propagation trouble due to components which include metal such as a battery.SOLUTION: A protector for protecting a thermosensitive part of the heat detector serves as an antenna to thereby allow the antenna to be inconspicuous from the outside, facilitate the assembling, and to further separate components including metal such as a battery and the antenna. This configuration is less likely to cause a radio wave propagation trouble.</p> |
