Title:
COMPLEX SENSOR BY INFRARED BEAM METHOD
Document Type and Number:
Japanese Patent JPH06129903
Kind Code:
A
Abstract:
PURPOSE: To economically structure a simple and very reliable home security sensor system.
CONSTITUTION: The intensity of an infrared beam transmitted from a light source is detected by a light intensity detecting part 101, and if the time dependency of the attenuation factor of the light intensity is large, the cause is judged invasion and if small, smoke by a part 301 for analyzing the change rate of light intensity. From the change of an incident position of the infrared beam incident upon a part 102 for detecting a light beam position, the judgment of a fire or smoke is carried out by a part 302 for analyzing the change rate of a light beam position.
Inventors:
FUJIWARA KOICHI
Application Number:
JP30445792A
Publication Date:
May 13, 1994
Filing Date:
October 19, 1992
Export Citation:
Assignee:
NIPPON TELEGRAPH & TELEPHONE
International Classes:
G01J1/02; H01L37/02; (IPC1-7): G01J1/02; H01L37/02
Attorney, Agent or Firm:
Masataka Kobayashi