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US 10,593,180 B2Granted
Heatable smoke alarm
AssigneeDiehl Aviation Gilching GmbH
InventorsKarl Albrecht Hopfe, Jan Boris Philipp
Life of this patent
Estimating the term…
Abstract
A smoke alarm has a housing with a heating device for heating walls of the housing to a temperature above the dew point. The heating device has at least one heating light emitting diode (LED). The heating LED has an opening angle for the emission of light, which opening angle leads to an irradiated area of the housing.
Claims15
A smoke alarm being a scattered radiation fire alarm, comprising:
- a housing having walls;
- a heating device having at least one heating light emitting diode (LED) heating said walls of said housing to a temperature above a dew point by emitted light, light emitted from the at least one heating LED not being used to detect smoke;
- at least one radiation source;
- at least one detector for detecting at least one of scattered radiation or radiation generated by said at least one heating LED;
- and
- the smoke alarm configured to switch off said heating device for a duration within which said at least one radiation source emits a light pulse for detecting the scattered radiation, wherein said heating device and said radiation source do not emit light simultaneously.
3 more elements
A smoke alarm being a scattered radiation fire alarm, comprising:
- a housing having walls;
- a heating device having at least one heating light emitting diode (LED) heating said walls of said housing to a temperature above a dew point by emitted light, light emitted from the at least one heating LED not being used to detect smoke;
- at least one radiation source;
- at least one detector for detecting at least one of scattered radiation or radiation generated by said at least one heating LED;
- a first optical axis of the radiation source and a second optical axis of the at least one detector being situated within a luminous cone of said at least one heating LED;
- and
- the smoke alarm configured to switch off said heating device for a duration within which said at least one radiation source emits a light pulse for detecting the scattered radiation, wherein said heating device and said radiation source do not emit light simultaneously.
4 more elements
Dependencies are inferred from the claim text.