Patent US3648056A successfully refreshed from Google Patents.
US3648056A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical detector with radiant energy absorbing chamber
Assignee: Honeywell Inc
•
Filing: 1970-01-12
•
Granted: 1972-03-07
•
Expires: 1990-01-12
Abstract
Abstract Apparatus for protecting an electro-optical detector from sources of radiant energy located off the primary optical axis is provided so as to take advantage of the focusing characteristics of the primary optical components to direct desired radiation in a cavity designed and located to receive the focused off-axis radiant energy and cause it to dissipate by absorption during a number of reflections.
Inventors
- 👤 Thomas B Buttweiler
- 👤 Joseph S Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:08
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/06; G01J1/0214; G01J1/0252
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
137 words
Apparatus of the class described comprising in combination: an elongated radiant energy absorbing chamber having first and second apertures longitudinally spaced along an axis thereof; primary optical apparatus mounted in said first aperture for converging radiant energy from a remote object at a point in an image plane located within said chamber between said apertures, said energy thereafter diverging at a predetermined angle toward said second aperture; optical detecting means mounted beyond said second aperture to receive energy diverging therethrough, the angle subtended by said detecting means and that subtended by said second aperture, at said point, being substantially equal to said predetermined angle; and radiant energy absorbing means reentrant within said chamber, and surrounding said second aperture, for cooperating with said chamber to minimize the passage of energy not originating at said object to said detector.
Claim 2
Dependent Claim
137 words
Apparatus of the class described comprising in combination: an elongated radiant energy absorbing chamber having first and second apertures longitudinally spaced along an axis thereof; primary optical apparatus mounted in said first aperture for converging radiant energy from a remote object at a point in an image plane located within said chamber between said apertures, said energy thereafter diverging at a predetermined angle toward said second aperture; optical detecting means mounted beyond said second aperture to receive energy diverging therethrough, the angle subtended by said detecting means and that subtended by said second aperture, at said point, being substantially equal to said predetermined angle; and radiant energy absorbing means reentrant within said chamber, and surrounding said second aperture, for cooperating with said chamber to minimize the passage of energy not originating at said object to said detector.
Claim 3
Dependent Claim
51 words
Apparatus according to claim 1 in which the last named means includes an opaque, conical, radiant energy absorbing wall, reentrant within said chamber and containing said second aperture at the vertex thereof, for cooperating with said chamber to minimize the passage of energy not originating at said object to said detector.
Claim 4
Dependent Claim
54 words
Apparatus according to claim 1 in which the last named means includes a mounting having a surface described by rotating a portion of a spiral about an axis of revolution lying in the plane of the spiral and displaced from the pole thereof, said axis of rotation coinciding with the axis of said chamber.
Claim 5
Dependent Claim
34 words
Apparatus according to claim 2 in which said chamber includes a conical wall tapering oppositely to the reentrant end wall to define therebetween and annular space which tapers away from said primary optical apparatus.
References Cited (Backward Citations)
US773202A
Cited
US2164526A
Cited
US2995997A
Cited
US3023318A
Cited
US3497694A
Cited
US3500049A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-03-07 | 1975-09-06 | 1976-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-07 | 1979-09-06 | 1980-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-07 | 1983-09-06 | 1984-03-07 | $7700.00 | Window Closed / Lapsed |