US3749928A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alarm device using infrared emission for detection and warning of heat build-up
Assignee: Individual
•
Filing: 1971-06-08
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Granted: 1973-07-31
•
Expires: 1991-06-08
Abstract
Abstract An alarm device for checking the temperature of objects placed within a shielded enclosure comprises alarm means and a unit for detecting infrared radiation including a detector which is fitted with a filtering and focusing optical system. At least one orientable mirror is placed on the one hand at one end of a rotatable cylindrical sleeve which extends through the enclosure wall and to which said mirror is attached and on the other hand symmetrically with the detector with respect to a stationary mirror, the mirrors being located in optically opposite relation within the sleeve. The orientable mirror is mounted on the sleeve and capable of pivoting about two axes which are located at right angles to each other and one of which is the axis of said sleeve. The pivotal movements correspond to trajectories of detected surfaces having the shape of a hyperbola or of a hyperbolic envelope.
Inventors
- 👤 J Jamet
- 👤 L Ponthus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 13:49
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/24; G02B23/2476; G01; G01J; G01J5/00; G01J5/0088; G01J5/02; G01J5/04; G01J5/041; G01J5/08; G01J5/0813; G21; G21C; G21C17/00; G21C17/10; G21C19/00; G21C19/40; G01J2005/0077; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
An alarm device for checking the temperature of objects within an enclosure wall having isolating means, comprising a unit for detecting infrared radiation and alarm means therefore, said unit including an infrared detector having a filtering and focussing optical system, a scanning mirror having two movements passing through axes perpendicular in said enclosure at one end of a rotatable sleeve extending through said enclosure wall, a copying mirror attached to the other end of said sleeve outside of said enclosure wall, a mechanical linkage between said mirrors maintaining their reflecting surfaces at 90* relative to each other, a fixed mirror disposed at 45* with respect to the long axis of said sleeve passing through said scanning and copying mirrors, said fixed mirror reflecting the radiation from said scanning mirror to said unit for detecting infrared radiation, and photoelectric detecting means for detecting the movement of said scanning mirror optically linked to said copying mirror for localizing the infrared radiation.
Claim 2
Dependent Claim
159 words
An alarm device for checking the temperature of objects within an enclosure wall having isolating means, comprising a unit for detecting infrared radiation and alarm means therefore, said unit including an infrared detector having a filtering and focussing optical system, a scanning mirror having two movements passing through axes perpendicular in said enclosure at one end of a rotatable sleeve extending through said enclosure wall, a copying mirror attached to the other end of said sleeve outside of said enclosure wall, a mechanical linkage between said mirrors maintaining their reflecting surfaces at 90* relative to each other, a fixed mirror disposed at 45* with respect to the long axis of said sleeve passing through said scanning and copying mirrors, said fixed mirror reflecting the radiation from said scanning mirror to said unit for detecting infrared radiation, and photoelectric detecting means for detecting the movement of said scanning mirror optically linked to said copying mirror for localizing the infrared radiation.
Claim 3
Dependent Claim
25 words
A device in accordance with claim 1, the two movements of said scanning mirror tracing trajectories of detected surfaces having the shape of a hyperbola.
Claim 4
Dependent Claim
27 words
A device in accordance with claim 1 the two movements of said scanning mirror being adjustable whereby one movement may be reversed with respect to the other.
Claim 5
Dependent Claim
35 words
A device in accordance with claim 1, said photoelectric detecting means including a virtual point light-source producing a beam projected onto said copying mirror and reflected onto a photoelectric detecting matrix swept by said beam.
Claim 6
Dependent Claim
20 words
A device in accordance with claim 1, said sleeve being of stainless steel forming a part of said isolating means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-07-30 | 1977-01-29 | 1977-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-30 | 1981-01-29 | 1981-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-30 | 1985-01-29 | 1985-07-31 | $7700.00 | Window Closed / Lapsed |