Printed circuit board for smoke detector
Disclosed is a smoke detector comprising: a housing including a base, the base including a planar surface configured for being positioned against and attached to a ceiling, a printed circuit board (PCB) comprising a substantially planar shape with a front surface and an opposing back surface spaced in a thickness direction T, and a plurality of perimeter edges including a bottom edge and an opposing top edge spaced in a height-wise direction H, a first side edge and an opposing second side edge spaced in a transverse direction, wherein the top edge comprises a first projection extending in the height-wise direction away from the top edge, the first projection including a first temperature sensor height-wise spaced from the top edge, and the PCB is mounted to the housing so that the front surface of the PCB is perpendicular to the planar surface of the base.
1. A smoke detector comprising:
a housing including a base, the base including a planar surface configured for being positioned against and attached to a ceiling,
a printed circuit board (PCB) comprising a substantially planar shape with a front surface and an opposing back surface spaced in a thickness direction T, and a plurality of perimeter edges including a bottom edge and an opposing top edge spaced in a height-wise direction H, a first side edge and an opposing second side edge spaced in a transverse direction,
wherein
the top edge comprises a first projection extending in the height-wise direction away from the top edge, the first projection including a first temperature sensor height-wise spaced from the top edge, and
the PCB is mounted to the housing, so that
the front surface of the PCB is perpendicular to the planar surface of the base, and
the first projection extends away from the planar surface of the base, wherein
the top edge of the PCB includes a first segment which is transversely intermediate the first side edge and the second side edge, and
the first segment having a profile shape that defines a cutout area in the planar shape of the PCB.
2. The smoke detector of claim 1 , comprising
a light detector connected to the first segment at a first location, the light detector being oriented so that a center focus of detection extends along a first axis that extends into the cutout area, and
a light emitter connected to the first segment at a second location within the cutout area, the light emitter being oriented so that a center focus of projection extends along a second axis that extends into the cutout area.
3. The smoke detector of claim 2 , wherein at least a first electrical lead extends in the height-wise direction away from the bottom edge of the PCB for electrically connecting the PCB to a base of the smoke detector.
4. The smoke detector of claim 3 , wherein at least a second electrical lead extends in the thickness direction away from the front surface of the PCB for electrically connecting the PCB to a peripheral component.
5. The smoke detector of claim 4 , wherein
the first top segment of the PCB includes a first transverse end proximate the first side edge of the PCB,
the first transverse end comprising the first projection extending in the height-wise direction away from the first top segment.
6. The smoke detector of claim 5 , wherein
the first top segment of the PCB includes second transverse end that opposes the first transverse end and is proximate the second side edge of the PCB,
the second transverse end comprising a second projection extending parallel to the first projection,
wherein the smoke detector includes a plurality of temperature sensors including the first temperature sensor and a second temperature sensor, and
wherein the second projection includes the second temperature sensor.
7. The smoke detector of claim 6 , wherein
the housing includes a first side wall, and the base includes a first electrical connector, and
wherein the first electrical lead in the PCB is electrically connected to the first electrical connector in the base, and the first side edge of the PCB is positioned against the first side wall of the housing.
8. The smoke detector of claim 7 , comprising
a smoke chamber positioned over the first segment of the top edge of the PCB, wherein the smoke chamber is positioned transversely between the first projection and the second projection, and
wherein the smoke chamber includes:
a first cavity for receiving smoke, the first cavity extending away from the top edge of the PCB in the height-wise direction, and
the first cavity including at least a first opening for fluidly receiving a flow of smoke and directing the flow of smoke to the plurality of temperature sensors.
9. The smoke detector of claim 8 , wherein:
the first electrical lead comprises a plurality of electrical pins and the second electrical lead comprises a plurality of electrical mounting hooks.
10. A method of manufacturing a smoke detector, comprising
obtaining a housing that includes a base, the base including a planar surface configured for being positioned against and attached to a ceiling,
forming a printed circuit board (PCB) with a substantially planar shape having a front surface and an opposing back surface spaced in a thickness direction T, wherein the PCB includes a plurality of perimeter edges including a bottom edge and an opposing top edge spaced in a height-wise direction H, a first side edge and an opposing second side edge spaced in a transverse direction,
wherein
the top edge comprises a first projection extending in the height-wise direction away from the top edge, the first projection including a first temperature sensor height-wise spaced from the top edge, and
the PCB is mounted to the housing so that
the front surface of the PCB is perpendicular to the planar surface of the base, and
the first projection extends away from the planar surface of the base, and
forming in the top edge of the PCB a first segment which is transversely intermediate the first side edge and the second side edge, and
wherein the first segment having a profile shape that defines a cutout area in the planar shape of the PCB.
11. The method of claim 10 , comprising
connecting a light detector to the first segment at a first location, the light detector being oriented so that a center focus of detection extends along a first axis that extends into the cutout area, and
connecting a light emitter to the first segment at a second location within the cutout area, the light emitter being oriented so that a center focus of projection extends along a second axis that extends into the cutout area.
12. The method of claim 11 , wherein at least a first electrical lead extends in the height-wise direction away from the bottom edge of the PCB for electrically connecting the PCB to a base of the smoke detector.
13. The method of claim 12 , wherein at least a second electrical lead extends in the thickness direction away from the front surface of the PCB for electrically connecting the PCB to a peripheral component.
14. The method of claim 13 , wherein
the first top segment of the PCB includes a first transverse end proximate the first side edge of the PCB,
the first transverse end comprising the first projection extending in the height-wise direction away from the first top segment.
15. The method of claim 14 , wherein
the first top segment of the PCB includes second transverse end that opposes the first transverse end and is proximate the second side edge of the PCB,
the second transverse end comprising a second projection extending parallel to the first projection,
wherein the smoke detector includes a plurality of temperature sensors including the first temperature sensor and a second temperature sensor, and
wherein the second projection includes the second temperature sensor.
16. The method of claim 15 , wherein the housing that includes a first side wall and the base includes a first electrical connector,
fixedly connecting the PCB to the base so that the bottom edge of the PCB is disposed against the base,
wherein the first electrical lead in the PCB is electrically connected to the first electrical connector in the base, and the first side edge of the PCB is positioned against the first side wall of the housing.
17. The method of claim 16 , comprising
positioning a smoke chamber over the first segment of the top edge of the PCB, wherein the smoke chamber is positioned transversely between the first projection and the second projection, and
wherein the smoke chamber includes
a first cavity for receiving smoke, the first cavity extending in the height-wise direction away from the top edge of the PCB, and
the first cavity including at least a first opening for fluidly receiving a flow of smoke and directing the flow of smoke to the plurality of temperature sensors.
18. The method of claim 17 , wherein:
the first electrical lead comprises a plurality of electrical pins and the second electrical lead comprises a plurality of electrical mounting hooks.