Title:
OPTICAL SMOKE SENSOR
Document Type and Number:
Japanese Patent JPS5557995
Kind Code:
A
Abstract:
An optical smoke detector including a plurality of walls extending from a dark chamber in which an optical smoke sensor is located. The walls form passages in the detector which extend from smoke entrances on the outer perimeter to smoke ports that feed into the dark chamber. In construction, the smoke entrances extend substantially continuously around the perimeter of the smoke detector to allow the free entry of smoke into the dark chamber. Each wall is arranged to overlap the next so as to obstruct the direct rays of light from entering the dark chamber and a screen is disposed around the perimeter of the detector to prevent the entrance of insects into the dark chamber.
Inventors:
ANJIERO EI MAASOTSUCHI
ROBAATO BII PAWAAZU
HIYUU DEII DAIAA
ROBAATO BII PAWAAZU
HIYUU DEII DAIAA
Application Number:
JP12935479A
Publication Date:
April 30, 1980
Filing Date:
October 06, 1979
Export Citation:
Assignee:
AMERICAN DISTRICT TELEGRAPH CO
International Classes:
G08B17/10; G08B17/107; G01N21/53; (IPC1-7): G01N21/53; G08B17/10