US4498728A
Expired / Lapsed
US
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Optical element
Assignee: OC Oerlikon Balzers AG
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Filing: 1983-03-01
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Granted: 1985-02-12
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Expires: 2003-03-01
Abstract
Abstract An optical element particularly elements of IR optics comprises a system of a plurality of infrared transmitting optically effective thin layers of substances. The substances are chosen from the group: germanium, zinc selenide, zinc sulfide, chalcogenide glasses, thorium fluoride, yttrium fluoride, and praseodymium fluoride. The layers are applied to an infrared transmitting substrate of a material of the group: germanium, zinc selenide, zinc sulfide and chalcogenide glasses. An intermediate layer is disposed between the thin layers and the infrared transmitting substrate and this has a maximum thickness of 100 nm and comprises a material of the group: hafnium oxide, yttrium oxide, and scandium oxide.
Inventors
- 👤 Werner Thoni
- 👤 Peter Huber
- 👤 Karl Hohenegger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:47
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/36; C03C17/3602; C03C17/3649; C03C17/3411; C03C17/3429; C03C17/3447; C03C17/3452; C03C17/3464; C03C17/347; C03C17/3476; G; G02; G02B; G02B1/00; G02B1/10; G02B1/11; G02B1/113; G02B1/115; G02B13/00; G02B13/14; G02B5/00; G02B5/20; G02B5/208
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
91 words
An optical element comprising a system of a plurality of infrared transmitting, optically effecting thin layers of substances of the group: germanium, zinc selenide, zinc sulfide, chalcogenide glasses, thorium fluoride, yttrium fluoride, and praseodymium fluoride, applied to an infrared transmitting substrate of a material of the group: germanium, zinc selenide, zinc sulfide, and chalcogenide glasses, an intermediate layer having a thickness of 100 nm at most, of a material of the group; hafnium oxide, yttrium oxide, and scandium oxide is provided between the substrate and the optically effective layer adjacent thereto.
Claim 2
Dependent Claim
91 words
An optical element comprising a system of a plurality of infrared transmitting, optically effecting thin layers of substances of the group: germanium, zinc selenide, zinc sulfide, chalcogenide glasses, thorium fluoride, yttrium fluoride, and praseodymium fluoride, applied to an infrared transmitting substrate of a material of the group: germanium, zinc selenide, zinc sulfide, and chalcogenide glasses, an intermediate layer having a thickness of 100 nm at most, of a material of the group; hafnium oxide, yttrium oxide, and scandium oxide is provided between the substrate and the optically effective layer adjacent thereto.
Claim 3
Dependent Claim
20 words
An optical element according to claim 1, characterized in that the intermediate layer has a layer thickness of 30 nm±10%.
Claim 4
Dependent Claim
32 words
An optical element according to claim 1, characterized in that intermediate layers of a material of the group: hafnium oxide, yttrium oxide, and scandium oxide are provided between the optically effective layers.
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) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |