Patent US1849256A successfully refreshed from Google Patents.
Patent US4752769A successfully refreshed from Google Patents.
US4752769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared motion alarm
Assignee: Heimann GmbH
•
Filing: 1986-09-02
•
Granted: 1988-06-21
•
Expires: 2006-09-02
Abstract
Abstract The invention is directed to an infrared motion alarm characterized by an infrared detector and an optical arrangement before the detector in the radiation direction for focussing the infrared radiation onto the detector. The optical arrangement is formed by a mirror arrangement and by a lens arrangement with the mirrors being on different levels so the different beam paths are being detected to prevent an intruder from crawling under the infrared detection beam paths.
Inventors
- 👤 Gerhard Knaup
- 👤 Fred Plotz
- 👤 Norbert Schaaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:03
CPC Classifications
G; 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
122 words
In an infrared motion alarm for monitoring infrared radiation, said alarm comprising a single infrared detector and an optical arrangement located in front of the detector in a monitoring direction for focussing the infrared radiation onto the detector, the improvements comprising the optical arrangement being formed by a plurality of mirrors and a single lens arrangement, said lens arrangement being disposed between the mirrors and the single detector, said mirrors being arranged in a plurality of different levels with a plurality of mirrors in each level, each of the mirrors directing a beam of infrared radiation from a given location to the lens arrangement so that a large angle of acquisition in two orthogonal directions can be monitored by the single detector.
Claim 2
Dependent Claim
122 words
In an infrared motion alarm for monitoring infrared radiation, said alarm comprising a single infrared detector and an optical arrangement located in front of the detector in a monitoring direction for focussing the infrared radiation onto the detector, the improvements comprising the optical arrangement being formed by a plurality of mirrors and a single lens arrangement, said lens arrangement being disposed between the mirrors and the single detector, said mirrors being arranged in a plurality of different levels with a plurality of mirrors in each level, each of the mirrors directing a beam of infrared radiation from a given location to the lens arrangement so that a large angle of acquisition in two orthogonal directions can be monitored by the single detector.
Claim 3
Dependent Claim
19 words
In an infrared motion alarm according to claim 1, wherein the lens arrangement is formed by a Fresnel lens.
Claim 4
Dependent Claim
49 words
In an infrared motion alarm according to claim 1, wherein all of the locations for the mirrors lie on arcs with the locations of the mirrors of one level being on an arc of a different radius than an arc for the locations of the mirrors of another level.
References Cited (Backward Citations)
US3631434A
Cited
US3631434B1
Cited
US3703718A
Cited
US3703718B1
Cited
US3766539A
Cited
US4321594A
Cited
EP0050751A1
Cited
US4429224A
Cited
DE3235250A1
Cited
US4612442A
Cited
US4588988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-21 | 1991-12-21 | 1992-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-21 | 1995-12-21 | 1996-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-21 | 1999-12-21 | 2000-06-21 | $7700.00 | Window Closed / Lapsed |