US4453801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protected Luneburg lens
Assignee: Canon Inc
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Filing: 1981-04-15
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Granted: 1984-06-12
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Expires: 2001-04-15
Abstract
Abstract A Luneburg lens formed on an optical waveguide has a protective coating to assure stable optical characteristics by preventing changes in the focal length due to exposure to surrounding light and/or moisture. The Luneburg lens may be of As 2 S 3 material provided on a Ti in-diffused LiNbO 3 waveguide.
Inventors
- 👤 Carl M. Verber
- 👤 James R. Busch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:01
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/124; G02B6/1245
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
45 words
A protected Luneburg lens device comprising: a Luneburg lens overlay formed on an optical waveguide, said overlay being of a material having a refractive index higher than that of said waveguide; and a protective coating on said overlay for protecting said material from atmospheric influences.
Claim 2
Dependent Claim
45 words
A protected Luneburg lens device comprising: a Luneburg lens overlay formed on an optical waveguide, said overlay being of a material having a refractive index higher than that of said waveguide; and a protective coating on said overlay for protecting said material from atmospheric influences.
Claim 3
Dependent Claim
19 words
A protected Luneburg lens device according to claim 1, wherein said overlay material comprises As 2 S 3 .
Claim 4
Dependent Claim
19 words
A protected Luneburg lens device according to claim 2, wherein said waveguide is a titanium in-diffused LiNbO 3 waveguide.
Claim 5
Dependent Claim
37 words
A protected Luneburg lens device according to claim 1, wherein said protective coating comprises a first film layer having a refractive index lower than that of said overlay and a second film layer for reflecting external light.
Claim 6
Dependent Claim
23 words
A protected Luneburg lens device according to claim 4, wherein said first film layer has a thickness of about 1,000 Å or more.
Claim 7
Dependent Claim
31 words
A protected Luneburg lens device according to claim 5, wherein said second film layer is a highly reflective element formed of alternating layers of high and low refractive index dielectric materials.
Claim 8
Dependent Claim
25 words
A protected Luneburg lens device according to claim 4, wherein the refractive index of said first film layer is between about 1.30 and about 2.10.
Claim 9
Dependent Claim
23 words
A protected Luneburg lens device according to claim 4, wherein said second film layer has a thickness of about 500 Å or more.
Claim 10
Dependent Claim
18 words
A protected Luneburg lens device according to claim 4, wherein said second film layer is a metal film.
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) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |