SMOKE DETECTOR
First Claim
1. A device for detecting smoke comprising:
- a housing having vents for allowing ingress of said smoke into the housing;
a sensor chamber disposed within the housing, said sensor chamber defined by a first chamber part and a second chamber part and having vents for allowing ingress of said smoke into the sensor chamber;
a sensor mounted within the sensor chamber;
an alarm circuit including a detector for detecting said smoke when sensed by the sensor; and
a printed circuit board supported by the chamber parts so that it is partially sandwiched between the first chamber part and the second chamber part, such that an edge thereof extends part way into said sensor chamber so as to divide the sensor chamber into two portions, one disposed above the printed circuit board and the other below the printed circuit board, wherein said printed circuit board has the alarm circuit and the sensor mounted thereon and the sensor is mounted on, near or adjacent to said edge.
1 Assignment
0 Petitions
Accused Products
Abstract
An alarm for detecting smoke comprises a housing (1) having vents (9) for allowing ingress of smoke into the housing. A sensor chamber (22,26) is disposed within the housing and has vents (24a,24b) for allowing ingress of smoke into the sensor chamber and comprises two parts. A diode emitter and diode sensor (25) is mounted within the sensor chamber for sensing light reflected off smoke. An alarm circuit (32), including detection means for detecting smoke sensed by the sensor diode (25), is supported on a printed circuit board (PCB) (29). The PCB is sandwiched between two halves (22 and 26) of the sensor chamber such that an edge (30) thereof extends part-way into said sensor chamber. The sensor is mounted on, near or adjacent to the edge.
47 Citations
12 Claims
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1. A device for detecting smoke comprising:
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a housing having vents for allowing ingress of said smoke into the housing; a sensor chamber disposed within the housing, said sensor chamber defined by a first chamber part and a second chamber part and having vents for allowing ingress of said smoke into the sensor chamber; a sensor mounted within the sensor chamber; an alarm circuit including a detector for detecting said smoke when sensed by the sensor; and a printed circuit board supported by the chamber parts so that it is partially sandwiched between the first chamber part and the second chamber part, such that an edge thereof extends part way into said sensor chamber so as to divide the sensor chamber into two portions, one disposed above the printed circuit board and the other below the printed circuit board, wherein said printed circuit board has the alarm circuit and the sensor mounted thereon and the sensor is mounted on, near or adjacent to said edge. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A sensor chamber assembly for use as the sensor chamber of a device for detecting smoke, the sensor chamber assembly comprising:
- a sensor chamber defined by a first chamber part and a second chamber part and vents for allowing ingress of smoke into the sensor chamber assembly;
a sensor mounted within the sensor chamber;
an alarm circuit including a detector for detecting said smoke when sensed by the sensor; and
a printed circuit board supported by the sensor chamber assembly, so that it is at least partially sandwiched between the first chamber part and the second chamber part, such that an edge thereof extends part way into said sensor chamber so as to divide the sensor chamber into two portions one disposed above the printed circuit board and the other below the printed circuit board, wherein said printed circuit board has the alarm circuit and the sensor mounted thereon wherein the sensor is mounted on, near or adjacent to said edge. - View Dependent Claims (12)
- a sensor chamber defined by a first chamber part and a second chamber part and vents for allowing ingress of smoke into the sensor chamber assembly;
Specification