US3873191A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uniform optical surfaces and elements
Assignee: Office National d'Études et de Recherches Aérospatiales
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Filing: 1973-09-04
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Granted: 1975-03-25
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Expires: 1993-09-04
Abstract
Abstract A transparent or reflecting optical element, having an optical surface of given shape, is manufactured by providing a mold member whose working surface is exactly complementary to the shape of the optical surface to be produced, and a base or support member having a geometrically simple working surface of a shape approximating that of the desired optical surface. The working surface of the mold member is lined with a film of an anti-adhesive material and a settable resin is cast between the confronting working surfaces of the mold and support members. After setting of the resin, the members are separated and there is obtained a rigid optical element whose body consists of the support member and whose optical surface is defined by a thin layer of that resin with the anti-adhesive film adhering thereto.
Inventors
- 👤 Claude Veret
- 👤 Pierre Durrenberger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 18:29
CPC Classifications
B; B29; B29D; B29D11/00; B29D11/00605; B24; B24B; B24B13/00; G; G02; G02B; G02B5/00; G02B5/08; G02B5/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
78 words
A reflective optical element comprising a rigid metallic support member with a rough working surface; a thin resinous layer adhering to said working surface, said layer having a thickness of less than 1 mm on the average but sufficient to even the irregularities of said working surface and to convert same into an optically effective surface; and a reflecting external metallic film with a thickness of less than 1 Mu adhering to an outer surface of said layer.
Claim 2
Dependent Claim
78 words
A reflective optical element comprising a rigid metallic support member with a rough working surface; a thin resinous layer adhering to said working surface, said layer having a thickness of less than 1 mm on the average but sufficient to even the irregularities of said working surface and to convert same into an optically effective surface; and a reflecting external metallic film with a thickness of less than 1 Mu adhering to an outer surface of said layer.
Claim 3
Dependent Claim
15 words
An optical element as defined in claim 1 wherein said support member consists of aluminum.
Claim 4
Dependent Claim
14 words
An optical element as defined in claim 2 wherein said film consists of aluminum.
Claim 5
Dependent Claim
23 words
An optical element as defined in claim 2 wherein said support member is disk-shaped and provided with reinforcinG ribs opposite said working surface.
Claim 6
Dependent Claim
22 words
An optical element as defined in claim 2 wherein said working surface is spherically concave and said outer surface is paraboloidally concave.
Claim 7
Dependent Claim
28 words
An optical element as defined in claim 5 wherein said working surface has a radius of curvature of about 1,600 mm. and a diameter of about 200 mm.
Claim 8
Dependent Claim
14 words
An optical element as defined in claim 5 wherein said film consists of aluminum.
Claim 9
Dependent Claim
39 words
An optical element comprising a rigid support member with a spherically concave working surface and a thin resinous layer on said working surface having a nonuniform thickness starting at substantially zero, said layer having a paraboloidally concave outer surface.
Claim 10
Dependent Claim
39 words
An optical element comprising a rigid support member with a spherically concave working surface and a thin resinous layer on said working surface having a nonuniform thickness starting at substantially zero, said layer having a paraboloidally concave outer surface.
Claim 11
Dependent Claim
27 words
An optical element as defined in claim 8, further comprising a reflecting metallic film with a thickness of less than 1 Mu adhering to said outer surface.
Claim 12
Dependent Claim
22 words
An optical element as defined in claim 9 wherein said surfaces extend over a vertex angle of approximately + or - 7*.
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) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |