PASSIVE INFRARED DETECTORS

• US 20090309029A1
• Filed: 07/19/2007
• Published: 12/17/2009
• Est. Priority Date: 07/27/2006
• Status: Active Grant

• Current Assignee: Tyco Fire & Security GmbH (Johnson Controls International plc)
• Original Assignee: Visonic Incorporated (Johnson Controls International plc)
• Inventors: Zhevelev, Boris, Kotlicki, Yaacov
• Granted Patent: US 8,017,913 B2
• Time in Patent Office: Days
• US Class Current: 250/353
• CPC Class Codes: G01J 5/0022 for sensing the radiation of moving bodies
• CPC Class Codes: G01J 5/0025 Living bodies ear thermometers G01J5/0011; detecting, measuring or recording for diagnostic purposes A61B5/00
• CPC Class Codes: G01J 5/046 Materials; Selection of thermal materials
• CPC Class Codes: G01J 5/08 Optical arrangements
• CPC Class Codes: G01J 5/0802 Optical filters
• CPC Class Codes: G01J 5/0808 Convex mirrors
• CPC Class Codes: G01J 5/0893 Arrangements to attach devices to a pyrometer, i.e. attaching an optical interface; Spatial relative arrangement of optical elements, e.g. folded beam path G01J5/049 takes precedence
• CPC Class Codes: G02B 5/208 for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• CPC Class Codes: G02B 5/22 Absorbing filters G02B5/201 - G02B5/208 take precedence
• CPC Class Codes: G08B 13/193 using focusing means

Abstract

An infrared motion detector including at least one infra-red radiation sensor, at least one radiation reflecting surface, operative to direct radiation impinging thereon towards the at least one infra-red radiation sensor and at least one coating layer, coating the at least one radiation reflective surface, which is substantially reflective to far infra-red radiation and which strongly absorbs at least one of visible light and near infra-red radiation, wherein the at least one coating layer includes black nickel.

Claims

1. An infrared motion detector comprising:

at least one infrared radiation sensor;

at least one radiation reflecting surface, operative to direct radiation impinging thereon towards said at least one infra-red radiation sensor; and

at least one coating layer, coating said at least one radiation reflecting surface, which is substantially reflective to far infra-red radiation and which strongly absorbs at least one of visible light and near infra-red radiation, wherein said at least one coating layer comprises black nickel.

4. An infrared motion detector according to claim 1 wherein said at least one coating layer is deposited onto a reflective coating layer.

5. An infrared motion detector according to claim 4 and wherein said reflective coating layer comprises at least one of nickel, chrome, silver, aluminum, copper, steel, and gold.

7. An infrared motion detector according to claim 1 and wherein said at least one coating layer has a thickness in the range of 0.2 and 10 microns.

9. An infrared motion detector according to claim 1 and wherein said far infrared radiation has wavelengths in the range of 7-14 μ

m.

10. An infrared motion detector according to claim 1 and wherein said visible light and said near infrared radiation have wavelengths below 2 μ

m.

11. An infrared motion detector according to claim 1 and also comprising at least one intermediate radiation reflecting surface located along the optical path of said radiation impinging on said at least one radiation reflecting surface and operative to direct said radiation along said optical path toward said at least one infrared sensor.

14. An infrared motion detector according claim 1 and wherein said at least one radiation reflecting surface comprises a focusing mirror for far infrared radiation.

15. An infrared motion detector according to claim 11 and wherein said at least one intermediate radiation reflecting surface comprises a non-focusing mirror for far infrared radiation.

16. An infrared motion detector according to claim 11 and wherein said at least one intermediate radiation reflecting surface provides optical power for far infrared radiation.

2-3. -3. (canceled)

6. (canceled)

8. (canceled)

12-13. -13. (canceled)

17-18. -18. (canceled)

19. A radiation reflector for use in motion detectors, to direct far infrared radiation towards an infrared radiation sensor, comprising:

at least one radiation reflecting surface;

at least one coating layer coating said radiation reflecting surface which is substantially reflective to far infrared radiation and which strongly absorbs at least one of visible light and near infrared radiation,

wherein said at least one coating layer comprises black nickel.

22. A radiation reflector according to claim 19 and wherein said at least one coating layer is deposited onto a reflective coating layer.

23. A radiation reflector according to claim 22 and wherein said reflective coating layer comprises at least one of nickel, chrome, silver, aluminum, copper, steel, and gold.

25. A radiation reflector according to claim 19 and wherein said at least one coating layer has a thickness in the range of 0.2 and 10 microns.

26. A radiation reflector according to claim 19 and wherein said far infrared radiation has wavelengths in the range of 7-14 μ

m.

27. A radiation reflector according to claim 19 and wherein said visible light and said near infrared radiation have wavelengths below 2 μ

m.

28. A radiation reflector according to claim 19 and wherein said at least one radiation reflecting surface comprises a multi-segmented mirror.

29. A radiation reflector according to claim 28 and wherein said at least one radiation reflecting surface comprises a focusing mirror for far infrared radiation.

30. A radiation reflector according to claim 28 and wherein said at least one radiation reflecting surface comprises a non-focusing mirror for far infrared radiation.

20-21. -21. (canceled)

24. (canceled)

31. (canceled)

32. A radiation reflector, for use in motion detectors, to direct far infrared radiation towards an infrared radiation sensor, the radiation reflector comprising:

a substrate base made of a plastic material;

a first layer of electroless conductive coating plated over at least part of said substrate base; and

a second layer comprising black nickel electroplated over said first layer.

33. A radiation reflector according to claim 32 wherein the first layer comprises electroless nickel or electroless copper.

37. A radiation reflector according to claim 32 and wherein said second layer has a thickness in the range of 0.2 and 10 microns.

38. A radiation reflector according to claim 32 and also comprising an additional layer comprising bright acid copper electroplated over said first layer, and wherein said second layer is electroplated over said additional layer.

39. A radiation reflector according to claim 32 and also comprising an additional layer comprising bright nickel electroplated over said first layer, and wherein said second layer is electroplated over said additional layer.

40. A radiation reflector according to claim 32 and also comprising:

a first additional layer comprising bright acid copper electroplated over said first layer; and

a second additional layer comprising bright nickel electroplated over said first additional layer,

wherein said second layer is electroplated over said second additional layer.

41. A radiation reflector according to claim 40 and wherein said second additional layer comprises at least one of chrome, silver, aluminum, copper, steel, and gold, having a bright finish electroplated over said second layer.

34-36. -36. (canceled)

42-48. -48. (canceled)