US3974376A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light amplifier for obtaining intensified light image from photoemissive surface
Assignee: ASTROPHYSICS RES CORP
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Filing: 1966-11-22
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Granted: 1976-08-10
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Expires: 1986-11-22
Abstract
Abstract This disclosure concerns a light amplification apparatus for focusing a light image of an object being viewed by the apparatus on a photoemissive surface which then emits a pattern of electrons directed at a fluorescent screen. An intensified light image of the object is produced on the screen by the electrons emitted from the photoemissive surface. The photoemissive surface faces in a direction away from the object being viewed and is concave for receiving light rays from the object being viewed which have been directed thereon by a lens-mirror having a rear concave mirror surface facing the concave photoemissive surface and a front convex surface. Thus, the light rays entering and leaving the lens-mirror are refracted in such a way as to produce a sharply focused image on the photoemissive surface.
Inventors
- 👤 Jan J. van der Sande
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:49
CPC Classifications
G; G02; G02B; G02B23/00; G02B23/12; H; H01; H01J; H01J31/00; H01J31/08; H01J31/50; H01J31/501
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
112 words
In light amplification apparatus having an evacuated chamber with at least one light transmissive wall portion, a photoemissive member within the chamber, reflecting means for receiving light from an externally located object passing through the wall portion and reflecting it onto the photoemissive member, and means for focusing the photoemitted electrons from the photoemissive member and providing a visible representation of the object, the improvement comprising that said reflecting means includes a lens-mirror body, said body having a concave rear surface reflecting coating with the concavity facing generally toward the photoemissive member, and said body further having a front surface formed convexly toward the photoemissive member through which the reflected light passes.
Claim 2
Dependent Claim
112 words
In light amplification apparatus having an evacuated chamber with at least one light transmissive wall portion, a photoemissive member within the chamber, reflecting means for receiving light from an externally located object passing through the wall portion and reflecting it onto the photoemissive member, and means for focusing the photoemitted electrons from the photoemissive member and providing a visible representation of the object, the improvement comprising that said reflecting means includes a lens-mirror body, said body having a concave rear surface reflecting coating with the concavity facing generally toward the photoemissive member, and said body further having a front surface formed convexly toward the photoemissive member through which the reflected light passes.
Claim 3
Dependent Claim
30 words
Light amplification apparatus as in claim 1, in which the lens-mirror body forms another wall portion of the evacuated chamber with the convex front surface thereof being within the chamber.
Claim 4
Dependent Claim
41 words
Light amplification apparatus as in claim 1, in which the photoemissive member is concavely shaped towards the reflecting means whereby the focal plane of the object reflected onto the photoemissive member is of similar curvature to that of the photoemissive member.
Claim 5
Dependent Claim
79 words
Light amplification apparatus as in claim 1, in which the means for focusing and providing a visible representation includes a generally elongate hollow electrode disposed within an opening in the lens-mirror body and having an open end within the chamber and the other end lying outwardly thereof, and a fluorescent screen closing the other end of the hollow electrode on which the photoemitted electrons from the photoemissive member are received for providing the visible representation of the object thereon.
Claim 6
Dependent Claim
32 words
Light amplification apparatus as in claim 4, in which the means for focusing and providing a visible representation further includes a generally cylindrical electrode located within the chamber adjacent the photoemissive member.
Claim 7
Dependent Claim
56 words
Light amplification apparatus as in claim 1, in which there is further provided outwardly of the evacuated chamber and adjacent the light transmissive wall portion an adjustably positionable objective lens assembly for receiving light from the object being viewed and focusing the same such that after reflection it is in proper focus on the photoemissive member.
Claim 8
Dependent Claim
38 words
Light amplification apparatus as in claim 6, in which the objective lens assembly includes a non-cemented doublet of a convexo-convex lens and a concavo-convex lens, the latter lens being the one closer to the light transmissive wall portion.
Claim 9
Dependent Claim
42 words
Light amplification apparatus as in claim 1, in which there is further provided an afocal lens system outwardly of the evacuated chamber and opposite the light transmissive wall portion for receiving light from the object and increasing the field of view thereof.
Claim 10
Dependent Claim
86 words
Light amplification apparatus as in claim 8, in which the afocal lens system includes a generally annularly shaped mirror body having a concave front reflecting surface facing the light transmissive wall portion; and a convex front surface mirror fixedly mounted between the annularly shaped mirror body and the light transmissive wall portion such that light from the object being viewed reflects off the convex front surface mirror onto the concave front reflecting surface of the annular mirror body and thence through the light transmissive wall portion.
Claim 11
Dependent Claim
28 words
Light amplification apparatus as in claim 1, in which the photoemissive member is deposited on the inner surface of the light transmissive wall portion of the evacuated chamber.
Claim 12
Dependent Claim
102 words
In light amplification apparatus having an evacuated chamber with at least one light transmissive wall portion, a photoemissive member within the chamber, reflecting means for receiving light from an externally located object passing through the wall portion and reflecting it onto the photoemissive member, and means for focusing the photoemitted electrons from the photoemissive member and providing a visible representation of the object, the improvement comprising that said reflecting means includes a lens-mirror body, said body having a concave rear mirror surface and said body further having a front surface formed convexly toward the photoemissive member through which the reflected light passes.
Claim 13
Dependent Claim
102 words
In light amplification apparatus having an evacuated chamber with at least one light transmissive wall portion, a photoemissive member within the chamber, reflecting means for receiving light from an externally located object passing through the wall portion and reflecting it onto the photoemissive member, and means for focusing the photoemitted electrons from the photoemissive member and providing a visible representation of the object, the improvement comprising that said reflecting means includes a lens-mirror body, said body having a concave rear mirror surface and said body further having a front surface formed convexly toward the photoemissive member through which the reflected light passes.
References Cited (Backward Citations)
US2683816A
Cited
US2663814A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |