US5017783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
360 degree field of view optical sensing device
Assignee: C&K Systems Inc
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Filing: 1989-10-25
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Granted: 1991-05-21
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Expires: 2009-10-25
Abstract
Abstract A 360° pattern field of view optical system for passive infrared detection device is disclosed. The optical system uses a combination of a fresnel lens and a fresnel prism to gather infrared radiation, focus the radiation, and refract radiation onto a focal point. Each of the combination of fresnel lens and prism is positioned substantially circumferentially about a central location to gather the infrared radiation from a 360° field of view and for focusing radiation gathered onto the central location. At the central location, a sensor is located. The sensor converts the focused infrared radiation into an electrical signal.
Inventors
- 👤 Ali R. Mousavi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 14:59
CPC Classifications
G; G02; G02B; G02B13/00; G02B13/06; G01; G01J; G01J5/00; G01J5/0022; G01J5/0025; G01J5/02; G01J5/07; G01J5/08; G01J5/0806; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B13/193; Y; Y10; Y10S; Y10S250/00; Y10S250/01
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
116 words
A three hundred sixty degree (360°) passive infrared radiation intrusion detector for gathering radiation at a distance spaced apart from a ground plane comprising: a plurality of infrared radiation gathering and focusing means positioned substantially circumferentially about a central location for gathering infrared radiation from a 360° field of view and for focusing said radiation gathered onto said central location; each of said plurality of infrared radiation gathering and focusing means comprises a combination fresnel lens and fresnel prism for directing said infrared radiation onto said central location; and a sensor at said central location for receiving radiation from said plurality of infrared radiation gathering and focusing means and for converting same into an electrical signal.
Claim 2
Dependent Claim
116 words
A three hundred sixty degree (360°) passive infrared radiation intrusion detector for gathering radiation at a distance spaced apart from a ground plane comprising: a plurality of infrared radiation gathering and focusing means positioned substantially circumferentially about a central location for gathering infrared radiation from a 360° field of view and for focusing said radiation gathered onto said central location; each of said plurality of infrared radiation gathering and focusing means comprises a combination fresnel lens and fresnel prism for directing said infrared radiation onto said central location; and a sensor at said central location for receiving radiation from said plurality of infrared radiation gathering and focusing means and for converting same into an electrical signal.
Claim 3
Dependent Claim
28 words
The detector of claim 1 further comprising: a lens for gathering radiation from said ground plane substantially perpendicular thereto and for focusing said gathered radiation onto said sensor.
Claim 4
Dependent Claim
82 words
The detector of claim 1 wherein each of said combination fresnel lens and fresnel prism further comprising: a fresnel lens for gathering radiation at a first angle with respect to said ground plane and for focusing said radiation onto said central location; and a fresnel prism for gathering radiation from said fresnel lens at said first angle and for refracting said gathered radiation onto said central location at a second angle, greater than said first angle, with respect to said ground plane.
References Cited (Backward Citations)
US4757204A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-05-20 | 1994-11-19 | 1995-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-05-20 | 1998-11-19 | 1999-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-05-20 | 2002-11-19 | 2003-05-21 | $7700.00 | Window Closed / Lapsed |