電池式腕時計および携帯用乾電池の本質安全防爆性

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  • 池田 武弘
    公害資源研究所九州石炭鉱山技術研究センター
  • 田代 裏
    公害資源研究所九州石炭鉱山技術研究センター
  • 中川 泰征
    公害資源研究所九州石炭鉱山技術研究センター

書誌事項

タイトル別名
  • Intrinsical Safety Properties of Quartz Watches and Dry Cells
  • デンチシキ ウデドケイ オヨビ ケイタイヨウ カンデンチ ノ ホンシツ アンゼ

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抄録

Man has sensuously supposed that the electronic circuits do not have enough energy to ignite inflammable gases, when electric sparks are produced because supply voltages of quartz watches are as low as, usually less than 3 V at the dry cell.<BR>Since research work on the intrinsical safety properties of electric circuits in quartz watches has not been reported until now, we report the results of an investigation was carried out to find out whether or not fundamental circuits of quartz watches which have been produced up to present time are sufficiently safe in methane-air mixture.<BR>The summary of results is as follows:<BR>(1) As intrinsical safety properties of dry cells in methane-air mixture are shown in Fig. 1, so it became clear that the common type of dry cell in each quartz watch is safe in methane gas.<BR>(2) Though we could not examine the detail of inner circuit of quartz watches because of manufacturers' secret, the possibility is assumed to be very low that methane-air mixture happens to ignite by breaking of wire or a short circuit.<BR>(3) Explosion tests on crashing of the illuminating lamp installed on liquid crystal panel in various quartz watches were carried out for 200 pieces of 1.55V-13mA lamp, 200 pieces of 2.8V-8.5mA lamp and 70 pieces of 3.0V-6.5mA lamp, but none of them could ignite 7-9% methane-air mixture.

収録刊行物

  • 日本鑛業會誌

    日本鑛業會誌 100 (1156), 487-491, 1984

    一般社団法人 資源・素材学会

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