Detector unit and sensing chamber therefor

• US 9,007,222 B2
• Filed: 03/15/2013
• Issued: 04/14/2015
• Est. Priority Date: 09/21/2012
• Status: Active Grant

• Current Assignee: Google LLC (Alphabet Inc.)
• Original Assignee: Google Inc. (Alphabet Inc.)
• Inventors: Mittleman, Adam, Goldenson, Andrew, Dong, William, Filson, John Benjamin, Fadell, Anthony Michael, Rogers, Matthew Lee, Matsuoka, Yoky, Kortz, Samuel W.
• Primary Examiner(s): Nguyen, Tai T
• Application Number:
  US13/835,439
• Publication Number:
  US 20140085093A1
• Time in Patent Office: 760 Days
• Field of Search: 340628-632, 340/511, 340/521, 340/693.9, 340/693.11
• US Class Current: 340/628
• CPC Class Codes: G01J 5/025 Interfacing a pyrometer to an external device or network; User interface
• CPC Class Codes: G01J 5/041 Mountings in enclosures or in a particular environment
• CPC Class Codes: G01J 5/0806 Focusing or collimating elements, e.g. lenses or concave mirrors
• CPC Class Codes: G01N 21/84 Systems specially adapted for particular applications
• CPC Class Codes: G08B 13/193 using focusing means
• CPC Class Codes: G08B 17/00 Fire alarms; Alarms responsive to explosion
• CPC Class Codes: G08B 17/10 Actuation by presence of smoke or gases , e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
• CPC Class Codes: G08B 17/11 using an ionisation chamber for detecting smoke or gas
• CPC Class Codes: G08B 17/113 Constructional details
• CPC Class Codes: G08B 21/14 Toxic gas alarms G08B21/16 takes precedence
• CPC Class Codes: H04L 12/282 based on user interaction within the home receiver circuitry for displaying additional information being controlled by a remote control apparatus H04N21/42204
• CPC Class Codes: H04L 12/6418 Hybrid transport
• CPC Class Codes: H05K 1/0274 Optical details, e.g. printed circuits comprising integral optical means H05K1/0269 takes precedence; coupling light guides with opto-electronic components G02B6/42
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: H05K 2201/10121 Optical component, e.g. opto-electronic component
• CPC Class Codes: H05K 2201/10151 Sensor
• CPC Class Codes: H05K 3/32 electrically connecting electric components or wires to printed circuits
• CPC Class Codes: H05K 5/0026 provided with connectors and printed circuit boards [PCB], e.g. automotive electronic control units
• CPC Class Codes: Y10T 29/4913 Assembling to base an electrical component, e.g., capacitor, etc.

Abstract

According to one embodiment, a hazard detector may include a back plate and a front casing coupled to the back plate to define a housing having an interior region and an opening through which air flows into the interior region. A circuit board may be coupled to the back plate and have a plurality of components mounted thereon. A smoke chamber may be mid-mounted on the circuit board, mid-mounting being characterized in the smoke chamber extending through a hole formed in the circuit board such that a top surface of the smoke chamber is positioned above a top surface of the circuit board and a bottom surface of the smoke chamber is positioned below a bottom surface of the circuit board, whereby an interior region of the smoke chamber is accessible to smoke from both the top and bottom surfaces of the circuit board.

Claims

1. A smoke detection unit for use in a building or structure for detecting a presence of smoke, the smoke detection unit comprising:

a housing having an interior region within which components of the smoke detection unit are contained, the housing having a plurality of openings through which air is flowable into the interior region of the housing, the housing comprising;

a back plate that is couplable to a wall of the building or structure so as to secure the smoke detection unit relative thereto;

a front casing coupled to the back plate to define the interior region of the housing;

a circuit board coupled to the back plate and having a plurality of components mounted thereon so as to support the components and electrically couple the components;

an alarm device mounted on the circuit board, the alarm device being activatable upon the detection of the presence of smoke so as to warn an occupant of the building or structure of a potential danger; and

a smoke chamber mounted on the circuit board, the smoke chamber having a top surface facing outwardly in a direction of the front casing, a bottom surface facing toward a direction of the back plate, and one or more sides that define an interior chamber, the smoke chamber having one or more components configured to detect the presence of smoke in the interior chamber so as to trigger the alarm device, the smoke chamber comprising a plurality of baffles positioned on at least one side through which smoke is able to flow into the interior chamber, wherein the smoke chamber is mounted on the circuit board such that the top surface of the smoke chamber is positioned above a top surface of the circuit board and the bottom surface of the smoke chamber is positioned below a bottom surface of the circuit board with the baffles extending below the bottom surface of the circuit board and above the top surface of the circuit board such that the interior chamber is accessible to smoke from both the top surface of the circuit board and the bottom surface of the circuit board.

2. The smoke detection unit of claim 1, further comprising a plate coupled with the smoke detection unit adjacent the smoke chamber and circuit board such that the plate restricts access to the circuit board and such that that the top surface of the smoke chamber is positioned above a top surface of the plate and the bottom surface of the smoke chamber is positioned below a bottom surface of the plate.

3. The smoke detection unit of claim 2, wherein the plate provides a relatively smooth surface that directs air to flow from an edge of the smoke detection unit toward the smoke chamber.

4. The smoke detection unit of claim 1, wherein the front casing comprises a plurality of holes through which air is flowable into the interior region of the housing and to the smoke chamber.

5. The smoke detection unit of claim 4, wherein a collective area of said plurality of holes of the front casing is between 20% and 40% of the front casing.

6. The smoke detection unit of claim 1, wherein the circuit board further comprises a carbon monoxide detector.

7. The smoke detection unit of claim 6, wherein the carbon monoxide detector is mounted on the circuit board such that the top surface of the carbon monoxide detector is positioned above a top surface of the circuit board and the bottom surface of the carbon monoxide detector is positioned below a bottom surface of the circuit board such that air is accessible to the carbon monoxide detector from both the top surface of the circuit board and the bottom surface of the circuit board.

8. The smoke detection unit of claim 1, wherein the smoke detection unit further comprises an additional air-flow dependent sensor that is mounted on the circuit board such that the top surface of the air-flow dependent sensor is positioned above a top surface of the circuit board and the bottom surface of the air-flow dependent sensor is positioned below a bottom surface of the circuit board such that air is accessible to the air-flow dependent sensor from both the top surface of the circuit board and the bottom surface of the circuit board.

9. The smoke detection unit of claim 1, wherein the smoke chamber further includes a plurality of baffles positioned on the top surface of the smoke chamber such that air is flowable into the smoke chamber from both the top surface and from the at least one side.

10. The smoke detection unit of claim 9, wherein the smoke chamber comprises a cylindrical configuration having baffles positioned circumferentially around the smoke chamber and baffles positioned on either or both the top surface or the bottom surface of the smoke chamber.

11. The smoke detection unit of claim 1, wherein the smoke detection unit is configured to transmit a message to a user regarding a condition related to the detection of smoke.

12. The smoke detection unit of claim 1, wherein the smoke detection unit is configured to reduce a sensitivity of the smoke chamber based on a reading of one or more other sensors of the smoke detection unit so as to reduce an occurrence of false signals.

13. The smoke detection unit of claim 1, wherein the smoke chamber is one of a photoelectric chamber and an ionization-type chamber.

14. The smoke detection unit of claim 1, further comprising a heat producing electrical component mounted on the circuit board such that air flow entering or exiting the smoke chamber is flowable to the heat producing electrical component.

15. The smoke detection unit of claim 14, wherein the heat producing electrical component is a microprocessor mounted on the top surface of the circuit board.

16. The smoke detection unit of claim 15, further comprising a second microprocessor mounted on the bottom surface of the circuit board.

17. A method of using a smoke detector comprising:

providing a smoke detector, wherein the smoke detector comprises;

a housing having an interior region, the housing having at least one opening through which air flows so as to be accessible to the interior region of the housing, the housing comprising;

a back plate couplable to a wall of a structure to secure the smoke detector to the structure;

a front casing coupled to the back plate to define the interior region of the housing; and

a circuit board coupled to the back plate and having a plurality of components mounted thereon, wherein the plurality of components include;

an alarm device; and

a smoke chamber having a plurality of baffles through which smoke is able to flow into an interior of the smoke chamber, the smoke chamber being coupled to the circuit board such that the baffles extend below a bottom surface of the circuit board and above a top surface of the circuit board so that air is flowable through the baffles into the smoke chamber from one side of the circuit board and flowable through the baffles out of the smoke chamber from an opposite side of the circuit board so as to provide substantially unimpeded flow of air into the smoke chamber; and

operating the smoke detector to detect smoke.

18. A method for manufacturing a smoke detector comprising:

providing a back plate, the back plate being couplable to a wall of a structure so as to secure the smoke detector to the structure;

coupling a front casing with the back plate so as to define a housing having an interior region within which components of the smoke detector are contained, wherein either or both the front casing or the back plate includes openings through which air flows so as to be accessible to the interior region of the housing;

coupling a circuit board with the back plate, the circuit board being configured to support and electrically couple one or more components of the smoke detector;

providing a smoke chamber having a plurality of baffles positioned on at least one side of the smoke chamber, the plurality of baffles being configured so that smoke is flowable into the interior of the smoke chamber via the baffles; and

coupling the smoke chamber with the circuit board such that a top surface of the smoke chamber is positioned above a top surface of the circuit board and a bottom surface of the smoke chamber is positioned below a bottom surface of the circuit board and so that the plurality of baffles are positioned below the bottom surface of the circuit board and above the top surface of the circuit board such that smoke is flowable into the smoke chamber from both the top surface of the circuit board and the bottom surface of the circuit board.

19. A smoke detector comprising:

a back plate couplable to a wall of a structure to secure the smoke detector to the structure;

a front casing coupled to the back plate to define a housing having an interior region and at least one opening through which air flows so as to be accessible to the interior region of the housing;

a circuit board coupled to the back plate and having a plurality of components mounted thereon; and

a smoke chamber, the smoke chamber being mid-mounted on the circuit board, said mid-mounting being characterized in that the smoke chamber extends through a hole formed in the circuit board such that a top surface and a plurality of baffles of the smoke chamber are positioned above a top surface of the circuit board and a bottom surface and the plurality of baffles of the smoke chamber are positioned below a bottom surface of the circuit board, whereby an interior chamber is accessible to smoke from both the top surface of the circuit board and the bottom surface of the circuit board.

20. The smoke detector of claim 19, wherein the smoke chamber comprises baffles positioned on a top surface and bottom surface of the smoke chamber such that smoke is flowable into an interior of the smoke chamber from any side.

21. The smoke detector of claim 19, further comprising a plate coupled adjacent the circuit board and smoke chamber such that the plate restricts access to the circuit board and such that that the top surface of the smoke chamber is positioned above a top surface of the plate and the bottom surface of the smoke chamber is positioned below a bottom surface of the plate.

22. The smoke detector of claim 21, wherein the plate provides a relatively smooth surface that directs air to flow from an edge of the smoke detector toward the smoke chamber.

23. The smoke detector of claim 19, wherein the circuit board further comprises a carbon monoxide detector.

24. The smoke detector of claim 19, wherein the circuit board further comprises a first microprocessor mounted thereon, and wherein air flow to the first microprocessor is increased due to the mid-mounting of the smoke chamber and/or other components.

25. The smoke detector of claim 24, wherein the circuit board further comprises a second microprocessor mounted on a same side of the circuit board as the first microprocessor or on a side opposite the first microprocessor, wherein air flow to both the first microprocessor and the second microprocessor is increased due to the mid-mounting of the smoke chamber and/or other components.