Patent ID: 6362743
Filing Date: 2002-03-26
Classification: G08B

Abstract:
A smoke alarm for generating an alarm in response to a sensed, potential fire comprising:a photoelectric detector having a photoelectric detector chamber for detecting a potential fire and a photo control circuit for generating a first alarm signal upon detection of a potential fire; an ionization detector having an ionization detector chamber for detecting a potential fire and an ionization control circuit for generating a second alarm signal upon detection of a potential fire; an audible alarm that activates upon generation of the first alarm signal or the second alarm signal; an AC power supply that supplies power to the control circuit of both the photoelectric detector and the ionization detector; and a DC power supply that supplies power to the control circuit of both the photoelectric detector and the ionization detector, wherein the DC power supply operates the smoke alarm only when the AC power supply is inoperable; wherein the ionization control circuit of the ionization detector is coupled to the photo control circuit of the photoelectric detector to receive the first alarm signal from the photo control circuit such that the ionization control circuit activates the audible alarm upon generation of the first alarm signal or the second alarm signal.