Combination photoelectric and ionization smoke detector
AssigneePittway Corporation
InventorsPeerouz Amleshi, Derrick J. Hesser
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Abstract
An ionization chamber for use in a smoke detector includes first and second outer electrodes and a non-reflective center electrode. The non-reflective center electrode can be formed as a metal electrode having a non-reflective coating or as a non-reflective, conductive plastic elements. The ionization chamber can be incorporated into combination smoke detector which includes a photoelectric sensor. A non-reflective center electrode, associated with the ion-type sensor is symmetrically located in the detector and displaced from the photoelectric sensor.
Claims21
An ionization-type smoke detector comprising an ionization chamber with:
- first and second spaced electrodes;
- and
- a third electrode, disposed between said first and second electrodes wherein said third electrode is formed of a conductive material and has a non-reflective surface.
A multiple sensor detector comprising:
- a housing which defines an internal region;
- an ionization-type smoke sensor carried within said housing wherein said sensor includes spaced first and second electrodes with a third, conductive, electrode, disposed therebetween wherein at least said third electrode is non-reflective;
- and
- another sensor carried within said housing.
A combination photoelectric and ionization smoke detector comprising:
- a housing which defines an internal volume;
- a photoelectric-type smoke sensor carried by said housing, at least in part, within said volume;
- an ion-type smoke sensor carried by said housing, at least in part, within said volume, and wherein said ion-type sensor includes a non-reflective, conductive, electrode which extends, at least in part, into said volume and is, in part, spaced from said housing.
A combined photoelectric and ionization smoke detector comprising:
- a housing which defines an internal volume;
- a photo-electric-type smoke detector carried in said housing wherein said detector includes a source of radiant energy and a spaced apart sensor;
- and
- an ionization-type smoke detector carried in said housing wherein said ionization-type smoke detector includes first, second and third spaced apart electrodes with said second electrode between said first and third electrodes, and wherein at least said first and said second electrodes are substantially non-reflective with said source and said sensor are located in a region in said housing between said first and second electrodes.
Dependencies are inferred from the claim text.