Importance

Loading Importance Indicators...

Abstract

An optical smoke detector has an optical block canopied by a substantially broad surfaced wall member that is pivotally attached to the opposite sides of the optical block and substantially spaced from the active surface of the optical block itself such that the sides of the wall member are open to stray ambient light. Manual owner-test-actuation of the alarm is accomplished by depressing an externally extending push-button which in turn gradually moves the wall member inwardly of the optical block. The gradual and consequent decrease in reaction volume between the light scattering surface of the moving wall member and the optical block, the optical block housing an infrared light emitting diode and an infrared photosensitive cell, creates a simulated atmosphere of smoke infiltration so as to cause an associated alarm circuit to be innervated.

Loading the Abstract Image...

First Claim