Patent US3827787A successfully refreshed from Google Patents.
US3827787A
Expired / Lapsed
US
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Arrangement for eliminating interference reflections in a light deviating device
Assignee: Alcatel Lucent SAS
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Filing: 1973-01-22
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Granted: 1974-08-06
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Expires: 1993-01-22
Abstract
Abstract Device for deviating light comprising two optical prisms driven in a rotating movement about a same axis, each of these prisms having an opaque sleeve crossing it from one face to the other and surrounding the rotating axis, and a method for producing prisms for the deviating device, consisting more particularly in positioning an opaque substance in a cylindrical groove formed in a transparent plate, and in dividing the plate in two parts along a transversal plane.
Inventors
- 👤 G Ripart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:41
CPC Classifications
G; G02; G02B; G02B26/00; G02B26/08; G02B26/0875; G02B26/0883; G02B26/0891; G01; G01C; G01C3/00; G02B5/00; G02B5/04
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
139 words
In a light deviating device comprising: two side by side optical prisms and means for mounting said prisms for relative rotation about a common axis passing through the faces of said prism for deviating light passing bidirectionally thrOugh said prisms, the improvement comprising: an opaque sleeve extending through each prism from one face to the other and forming an integral part of the same, said sleeves being of similar diameter and being axially aligned and coaxial with the common axis of rotation of said prism and defining in each prism, a light sealed central zone crossed by said axis and surrounded by said sleeve and a peripheral zone outside said sleeve for isolating the light passing through said prism bi-directionally, and each of the faces of said prisms being continuously plane from said central zone through said peripheral zone.
Claim 2
Dependent Claim
139 words
In a light deviating device comprising: two side by side optical prisms and means for mounting said prisms for relative rotation about a common axis passing through the faces of said prism for deviating light passing bidirectionally thrOugh said prisms, the improvement comprising: an opaque sleeve extending through each prism from one face to the other and forming an integral part of the same, said sleeves being of similar diameter and being axially aligned and coaxial with the common axis of rotation of said prism and defining in each prism, a light sealed central zone crossed by said axis and surrounded by said sleeve and a peripheral zone outside said sleeve for isolating the light passing through said prism bi-directionally, and each of the faces of said prisms being continuously plane from said central zone through said peripheral zone.
Claim 3
Dependent Claim
27 words
The device according to claim 1, further comprising: an opaque sleeve extending between prisms of similar diameter to the sleeve of said prism and axially aligned therewith.
Claim 4
Dependent Claim
19 words
The device according to claim 1, wherein each sleeve is cylindrical, having a substantially circular cross-section about said axis.
Claim 5
Dependent Claim
19 words
The device according to claim 2, wherein each sleeve is cylindrical, having a substantially circular cross-section about said axis.
Claim 6
Dependent Claim
25 words
The device according to claim 1, wherein the edges of said sleeves carried by said prisms are recessed a slight distance from the prism faces.
Claim 7
Dependent Claim
25 words
The device according to claim 2, wherein the edges of said sleeves carried by said prisms are recessed a slight distance from the prism faces.
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) | 1977-08-05 | 1978-02-04 | 1978-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-05 | 1982-02-04 | 1982-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-05 | 1986-02-04 | 1986-08-06 | $7700.00 | Window Closed / Lapsed |