Title:
PHOTOELECTRIC TYPE COMPOITE FIRE SENSOR
Document Type and Number:
Japanese Patent JPH06131572
Kind Code:
A
Abstract:
PURPOSE: To make it possible to simultaneously sense both of heat and smoke as analog values only by one detector.
CONSTITUTION: Since air heated and expanded by moderate room temperature variation in an air room 7 is allowed to flow out from an opened pin hole 8 in a temperature sensitive variable leak valve mechanism 220, a temperature sensitive moving mechanism 210 is not almost displaced. However when a sudden change 60°C e.g. in the room temperature is generated, the mechanism 220 is displaced. Thereby heat can be sensed from a light receiving position signal outputted from a photodetector 4 and smoke can be detected from a light intensity signal outputted from the photodetector 4.
Inventors:
FUJIWARA KOICHI
Application Number:
JP30592392A
Publication Date:
May 13, 1994
Filing Date:
October 21, 1992
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G08B17/06; G08B17/10; G08B17/103; (IPC1-7): G08B17/06; G08B17/10; G08B17/103
Attorney, Agent or Firm:
Masataka Kobayashi