| 摘要 |
PROBLEM TO BE SOLVED: To obtain a fire alarm for residence which can be scrapped or reproduced as a thing which does not generate any harmful substance without any special costs for countermeasures for harmful substance at the time of scrapping or reproduction, since there is no element (components, processing, etc.) to produce harmful substance by making no harmful substance come out from elements (components, processing, etc.) composing a fire alarm and making not to cause disruption of earth environment even if improper disposal is performed like an electric product (components) of small articles. SOLUTION: Soldering of all connecting sections of a printed circuit board 4, and an electronic component 5, an alarm buzzer 6, etc. to be mounted thereon is carried out with lead free solder. Chrome free steel plates are used for all metal fittings, such as alarm adapter plate 3. Rust proof processing of each steel plate is performed by plating other than Ni-Cr plating, for example Ni-Sn plating, galvanization, etc. and wiring cord comes to use the halogen free electric wire. COPYRIGHT: (C)2007,JPO&INPIT
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