Patent US3575490A successfully refreshed from Google Patents.
US3575490A
Expired / Lapsed
US
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Optical system for ranging by lasers and the like
Assignee: Lanteris Space LLC
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Filing: 1968-04-08
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Granted: 1971-04-20
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Expires: 1988-04-08
Abstract
Abstract A light splitting and recombining system, protecting observers and apparatus from destructive effects of laser flashes. Light from two paths is combined differentially to reduce, by interference, the light transmitted by the system. In one of the paths there is included a light-bleachable optical element whose transmissivity is a function of incident light energy. The system accepts low energy light of all wavelengths, but substantially stops high energy laser light.
Inventors
- 👤 Elias Reisman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 22:08
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/3523; A; A61; A61F; A61F9/00; A61F9/02; A61F9/022; A61F9/023; G01; G01S; G01S7/00; G01S7/48; G01S7/481; G01S7/4811
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
92 words
A system for transmitting light and for automatically blocking high intensity light, such as light from a laser, said system comprising: an element for splitting incident light into first and second light portions and directing the same into firsT and second paths, respectively; first and second reflectors for reflecting the first and second light portions back to said element and for recombining them thereby; and a light control element, disposed in one of said paths, the light transmissivity of which element rises and falls with the intensity of the light incident thereon.
Claim 2
Independent Claim
92 words
A system for transmitting light and for automatically blocking high intensity light, such as light from a laser, said system comprising: an element for splitting incident light into first and second light portions and directing the same into firsT and second paths, respectively; first and second reflectors for reflecting the first and second light portions back to said element and for recombining them thereby; and a light control element, disposed in one of said paths, the light transmissivity of which element rises and falls with the intensity of the light incident thereon.
Claim 3
Dependent Claim
29 words
A system as described in claim 1, including means for spacing the reflectors from the semireflector so as to tune the system to the wavelength of incident laser light.
Claim 4
Dependent Claim
43 words
A system as described in claim 1, additionally including compensator means for causing a transmission loss equal to that caused by said light control element at maximum transmissivity thereof. said compensator means being disposed in the path not including the light control element.
Claim 5
Dependent Claim
25 words
A system as described in claim 1 wherein said light control element is a disc or layer of a compound of selenium and cadmium sulfide.
Claim 6
Dependent Claim
18 words
A system as described in claim 3 wherein said light control element contains a solution of metal phthalocyanine.
Claim 7
Dependent Claim
23 words
A system as described in claim 1 wherein said light control element comprises a filter of material bleachable by light of high intensity.
Claim 8
Dependent Claim
69 words
A protective device for use in light receiving apparatus, said device comprising a pair of right angle prisms, each having a pair of perpendicular faces and a hypotenuse face, said prisms being mirrorized on said perpendicular faces, and substantially joined along said hypotenuse faces, each of the latter faces being semireflective, and a light bleachable filter between said hypotenuse faces of said prisms and one of said perpendicular faces.
Claim 9
Dependent Claim
69 words
A protective device for use in light receiving apparatus, said device comprising a pair of right angle prisms, each having a pair of perpendicular faces and a hypotenuse face, said prisms being mirrorized on said perpendicular faces, and substantially joined along said hypotenuse faces, each of the latter faces being semireflective, and a light bleachable filter between said hypotenuse faces of said prisms and one of said perpendicular faces.
Claim 10
Dependent Claim
21 words
A device as described in claim 7 including an additional pair of prisms similar to the described pair and cascaded therewith.
Claim 11
Dependent Claim
33 words
A device as described in claim 8, also including means for focusing and then collimating the light output of the first pair of prisms before applying it to the additional pair of prisms.
Claim 12
Dependent Claim
31 words
A device as described in claim 8, wherein one of said pairs of prisms is optically tunable to one laser frequency, and the other pair of prisms, to another laser frequency.
References Cited (Backward Citations)
US3470492A
Cited
US3455627A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |