Patent US3598475A successfully refreshed from Google Patents.
US3598475A
Expired / Lapsed
US
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Large aperture liquid-filled lens for precision artwork camera
Assignee: Teledyne Inc
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Filing: 1968-09-16
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Granted: 1971-08-10
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Expires: 1988-09-16
Abstract
Abstract A large aperture lens of high optical quality consisting of a hollow framework forming spaced apertures bounded by optical grade clear, bendable, flat windows bent into simply curved shapes and mounted in spaced relation on the framework to form a vessel for containing a liquid having a suitable index of refraction. In one form of the invention the windows are curved on cylindrical surfaces having axes arranged at right angles to each other and have the same curvature. A window-mounting arrangement is also disclosed which avoids undesirable stress development. A precision artwork camera using a lens of the above type as a condenser is also disclosed.
Inventors
- 👤 Robert E Lewis
- 👤 Melvin D Wright
- 👤 Philip E Chandler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 10:30
CPC Classifications
G; G02; G02B; G02B1/00; G02B1/06; G02B3/00; G02B3/12
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
24 words
A lens as in claim 1 wherein said first and second contours lie on cylinders having axes arranged at right angles to each other.
Claim 2
Dependent Claim
16 words
A lens as in claim 1 wherein said optically clear sheets are formed of acrylic plastic.
Claim 3
Dependent Claim
13 words
A lens structure as in claim 3 wherein said acrylic plastic is poly(methylmethacrylate).
Claim 4
Dependent Claim
15 words
A lens as in claim 1 wherein said liquid is an optically clear mineral oil.
Claim 5
Dependent Claim
16 words
A lens as in claim 1 wherein said liquid is an aqueous solution of a salt.
Claim 6
Dependent Claim
12 words
A lens as in claim 6 wherein said salt is zinc chloride.
Claim 7
Dependent Claim
36 words
A lens as in claim 1 further including a stress distribution strip interposed between the clamping band and the edge, and a leveling shim interposed between the other side of the band and the support surface.
Claim 8
Dependent Claim
23 words
A lens as in claim 1 further including a pressure sealant disposed between the support surface and the facing surface of the sheet.
Claim 9
Dependent Claim
23 words
A lens as in claim 1 wherein said first and second cylindrical contours lie on cylinders having axes arranged parallel to each other.
Claim 10
Dependent Claim
17 words
A lens as in claim 1 wherein the contours form a cone on at least one surface.
Claim 11
Dependent Claim
20 words
A lens as in claim 1 wherein said liquid includes an additive to define the bands of radiation passage therethrough.
Claim 12
Dependent Claim
18 words
A lens as in claim 1 wherein the lens surface sheet about a horizontal axis is vertically asymmetrical.
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) | 1974-08-09 | 1975-02-08 | 1975-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-09 | 1979-02-08 | 1979-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-09 | 1983-02-08 | 1983-08-10 | $7700.00 | Window Closed / Lapsed |