US4778996A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ceiling mounted passive infrared intrusion detector with pyramidal mirror
Assignee: Cerberus AG
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Filing: 1986-09-08
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Granted: 1988-10-18
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Expires: 2006-09-08
Abstract
Abstract A ceiling mounted passive infrared detector has an enclosure arranged for mounting to ceiling, a downwardly pointing infrared detecting element within the enclosure, a first multifaceted pyramidal mirror having an apex pointing upwardly toward the detecting element and a plurality of focusing lenses, one for each facet of the mirror and mounted between the base of the pyramidal mirror and the periphery of the enclosure to focus infrared radiation onto the detecting element directly and via reflection in the pyramidal mirror. A further embodiment includes the enclosure wherein the lenses are disposed on the plane immediately above the apex of the mirror so that radiation will be reflected off the mirror and refracted by the lenses onto the detecting element.
Inventors
- 👤 John Baldwin
- 👤 William Kahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:23
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: 12
Claim 1
Independent Claim
78 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said sensing element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation onto the facets of said mirror for reflection directly onto said sensing element.
Claim 2
Dependent Claim
78 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said sensing element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation onto the facets of said mirror for reflection directly onto said sensing element.
Claim 3
Dependent Claim
28 words
A ceiling mounted passive infrared intrusion detector as specified in claim 1 wherein said first lens means comprises a plurality of lenses mounted in said first multifaceted aperture.
Claim 4
Dependent Claim
108 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein said first lens means comprises a plurality of lenses mounted in said first multifaceted aperture, and wherein said lenses are further arranged to focus infrared radiation directly onto said sensing element.
Claim 5
Dependent Claim
108 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein said first lens means comprises a plurality of lenses mounted in said first multifaceted aperture, and wherein said lenses are further arranged to focus infrared radiation directly onto said sensing element.
Claim 6
Dependent Claim
178 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein there is provided a downwardly pointing light source within said first pyramidal mirror, and a second multifaceted pyramidal mirror mounted within said first pyramidal mirror and having the same number of reflective surfaces, with similar angular orientation, as said first pyramidal mirror, said second pyramidal mirror having a base with an outer periphery spaced from the base of said first pyramidal mirror so as to form a second multifaceted aperture, and second lens means for focusing light from said light source in a direction parallel to the radiation focused onto said detecting element by said focusing lenses in said first aperture.
Claim 7
Dependent Claim
178 words
A ceiling mounted passive infrared intrusion detector comprising; an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein there is provided a downwardly pointing light source within said first pyramidal mirror, and a second multifaceted pyramidal mirror mounted within said first pyramidal mirror and having the same number of reflective surfaces, with similar angular orientation, as said first pyramidal mirror, said second pyramidal mirror having a base with an outer periphery spaced from the base of said first pyramidal mirror so as to form a second multifaceted aperture, and second lens means for focusing light from said light source in a direction parallel to the radiation focused onto said detecting element by said focusing lenses in said first aperture.
Claim 8
Dependent Claim
113 words
A ceiling mounted passive infrared detector comprising: an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein said sensing element includes at least two sensing electrodes and wherein the distance between said electrodes is selected so that the angle between centers of said electrodes, as viewed from said lens means, is at least 5°.
Claim 9
Dependent Claim
113 words
A ceiling mounted passive infrared detector comprising: an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means for focusing infrared radiation reflected by the facets of said mirror onto said sensing element, wherein said sensing element includes at least two sensing electrodes and wherein the distance between said electrodes is selected so that the angle between centers of said electrodes, as viewed from said lens means, is at least 5°.
Claim 10
Dependent Claim
77 words
A ceiling mounted passive infrared intrusion detector comprising: an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means, disposed above the apex of said pyramidal mirror, for focusing infrared radiation onto said sensing element.
Claim 11
Dependent Claim
77 words
A ceiling mounted passive infrared intrusion detector comprising: an enclosure mountable on the ceiling; a downwardly pointing infrared sensing element mounted within said enclosure; a first multifaceted pyramidal mirror having an apex pointing upwardly toward said detecting element and having a base with a periphery spaced from said enclosure so as to define a first multifaceted aperture; and first lens means, disposed above the apex of said pyramidal mirror, for focusing infrared radiation onto said sensing element.
Claim 12
Dependent Claim
35 words
A ceiling mounted passive infrared intrusion detector as specified in claim 6 wherein said lens includes a central horizontal lens segment and a plurality of peripheral lens segments tilted with respect to said central segment.
References Cited (Backward Citations)
US3551676A
Cited
US4271359A
Cited
US4321594A
Cited
US4275303A
Cited
US4510488A
Cited
US4447726A
Cited
US4451734A
Cited
US4484075A
Cited
US4672206A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-10-18 | 1992-04-18 | 1992-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-10-18 | 1996-04-18 | 1996-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-10-18 | 2000-04-18 | 2000-10-18 | $7700.00 | Window Closed / Lapsed |