Optical chamber for smoke detection with reflective surfaces

Patent metadata

Field	Value
Publication number	US-12196665-B2
Application number	US-202117530075-A
Country	US
Kind code	B2
Filing date	Nov 18, 2021
Priority date	Nov 18, 2021
Publication date	Jan 14, 2025
Grant date	Jan 14, 2025

Abstract

Devices, systems, and methods for providing smoke detectors are described herein. One smoke detector of a fire sensing system includes a circuit board body, having a set of front scattering emitting light sources located on one side of an optical chamber, a receiver of front scattering light beams from the front scattering emitting light sources and backward scattering light beams, and a set of backward scattering emitting light sources located between the set of front scattering emitting light sources and the receiver, the backward scattering light beams emitted from the backward scattering emitters.

First claim

What is claimed:

1. A smoke detector of a fire sensing system, comprising:
a circuit board body, having:
a set of front scattering emitting light sources located on one side of an optical chamber;
a receiver of front scattering light beams from the front scattering emitting light sources; and
a set of backward scattering emitting light sources located between the set of front scattering emitting light sources and the receiver, the backward scattering light beams emitted from the backward scattering emitting light sources

a circuit board cover mounted over the set of front scattering emitting light sources, the set of backward scattering emitting light sources, and the receiver;
a forward scattering emitter module, placed within the circuit board cover, having a reflective surface formed on an interior surface of the forward scattering emitter module and wherein the reflective surface is positioned above the set of front scattering emitting light sources and reflects the front scattering light beams toward an optical cavity formed between the circuit board body and the circuit board cover;
a receiving module, placed within the circuit board cover, having a reflective surface formed on an interior surface of the receiving module and wherein the reflective surface is positioned above the receiver and reflects the front scattering light beams toward the receiver; and
a fixture within the circuit board cover shaped to precisely fit the shapes of the forward scattering emitter module and receiving module,
wherein the reflective surface of the forward scattering emitter module includes a double tilted ellipsoidal mirror.

2. The smoke detector of claim 1 , wherein the set of front scattering emitting light sources includes at least one infrared emitting light source.

3. The smoke detector of claim 1 , the set of front scattering emitting light sources includes at least one blue emitting light source.

4. The smoke detector of claim 1 , the set of backward scattering emitting light sources includes at least one infrared emitting light source.

5. The smoke detector of claim 1 , the set of backward scattering emitting light sources includes at least one blue emitting light source.

6. The smoke detector of claim 1 , wherein the circuit board cover is mounted over the set of front scattering emitting light sources, the set of backward scattering emitting light sources, and the backward scattering receiver and has the fixture into which the backward scattering receiver module is positioned.

7. The smoke detector of claim 6 , wherein the circuit board cover includes a reflective surface positioned above the set of forward scattering emitters that reflect the forward scattering light beams toward an optical cavity formed between the circuit board body and the circuit board cover.

8. The smoke detector of claim 7 , wherein the circuit board cover includes a reflective surface positioned above the receiver that reflect the forward scattering light beams and backward scattering light beams from an optical cavity formed between the circuit board body and the circuit board cover toward the receiver.

9. The smoke detector of claim 8 , wherein the circuit board cover includes a backward scattering housing positioned above the set of backward scattering emitters that restrict the direction that the backward scattering light beams can travel after being emitted from the backward scattering emitters.

10. The smoke detector of claim 6 , wherein the circuit board cover includes a reflective surface positioned above the receiver that reflect the forward scattering light beams and backward scattering light beams from an optical cavity formed between the circuit board body and the circuit board cover toward the receiver.

11. The smoke detector of claim 6 , wherein the circuit board cover includes a backward scattering housing positioned above the set of backward scattering emitters that restricts the direction that the backward scattering light beams can travel after being emitted from the backward scattering emitters.

12. A smoke detector of a fire sensing system, comprising:
a detector housing body;
a circuit board body, having:
a set of front scattering emitting light sources located on one side of an optical chamber;
a receiver of front scattering light beams from the front scattering emitting light sources; and
a set of backward scattering emitting light sources located between the set of front scattering emitting light sources and the receiver, the backward scattering light beams emitted from the backward scattering emitting light sources; and
a circuit board cover mounted over the set of front scattering emitting light sources, the set of backward scattering emitting light sources, and the receiver;

a forward scattering emitter module, placed within the circuit board cover, having a reflective surface formed on an interior surface of the forward scattering emitter module and wherein the reflective surface is positioned above the set of front scattering emitting light sources and reflects the front scattering light beams toward an optical cavity formed between the circuit board body and the circuit board cover;
a receiving module, placed within the circuit board cover, having a reflective surface formed on an interior surface of the receiving module and wherein the reflective surface is positioned above the receiver and reflects the front scattering light beams toward the receiver and
a fixture within the circuit board cover shaped to precisely fit the shapes of the forward scattering emitter module and receiving module.

13. The smoke detector of claim 12 , wherein the circuit board cover includes the forward scattering emitter module having a reflective surface formed on an interior surface of the forward scattering emitter module and wherein the reflective surface is positioned above the set of forward scattering emitters that reflect the forward scattering light beams toward an optical cavity formed between the circuit board body and the circuit board cover.

14. The smoke detector of claim 12 , wherein the circuit board cover includes the receiving module having a reflective surface formed on an interior surface of the module and wherein the reflective surface is positioned above the receiver that reflect the forward scattering light beams toward the receiver.

15. The smoke detector of claim 12 , wherein the circuit board cover includes a backward scattering emitter module having a housing positioned above the set of backward scattering emitters that restricts the direction that the backward scattering light beams can travel after being emitted from the backward scattering emitters.

Assignees

• Honeywell Int Inc

Inventors

• Chiatti Andrea
• Frison Andrea
• Bressanutti Massimo
• Berliavaz Maurizio

Classifications

• G08B17/107 Primary

  for detecting light-scattering due to smoke · CPC title

• G08B17/113

  Constructional details · CPC title

• G01N15/1434 Primary

  Optical arrangements · CPC title

• G01N21/01 Primary

  Arrangements or apparatus for facilitating the optical investigation · CPC title