(19)
(11) EP 0 113 046 A3

(12) EUROPEAN PATENT APPLICATION

(88) Date of publication A3:
05.12.1984 Bulletin 1984/49

(43) Date of publication A2:
11.07.1984 Bulletin 1984/28

(21) Application number: 83111869

(22) Date of filing: 26.11.1983
(84) Designated Contracting States:
BE CH DE FR GB IT LI

(30) Priority: 03.12.1982 JP 18261082

(71) Applicant: Nohmi Bosai Kogyo Co., Ltd.
 ()

(72) Inventor:
  • Okazaki, Toshiaki NOHMI BOSAI KOGYO CO., LTD.
     ()

   


(54) Heat detector


(57) This idea relates to a heat detector using an optical fiber as heat sensitive line, in which a modulation light is emitted from a light emitting element through the optical fiber, and output of the photoelectric element is checked for attenuation. This detector is capable of readily discriminating a fire by attentuation of the light from the light source caused by damage in the optical fiber in case of fire.






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