Patent US4372987A successfully refreshed from Google Patents.
US4372987A
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US
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Method of producing a multilayer anti-reflection coating
Assignee: D Swarovski KG
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Filing: 1981-03-09
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Granted: 1983-02-08
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Expires: 2001-03-09
Abstract
Abstract A method of producing a multilayer anti-reflection coating with an interference effect for optical purposes, and optical bodies with a multilayer anti-reflection coating is described, of which at least one layer has a low refractive index, at least one other layer has a medium refractive index, and--if necessary--other layers have a high refractive index, and whereby the layer of medium refractive value is produced by depositing a mixture of tantalic oxide and aluminum oxide by means of an electron gun in a vacuum in a reactive atmosphere.
Inventors
- 👤 Peter Ganner
- 👤 Theodor Wallner
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:50
CPC Classifications
C; C03; C03C; C03C17/00; C03C17/34; C03C17/3411; C03C17/3429; C03C17/3447; C03C17/3452; C03C17/22; C03C17/23; C03C17/245; C03C17/3417; C03C2217/00; C03C2217/20; C03C2217/21; C03C2217/218; C03C2217/23; C03C2218/00; C03C2218/10; C03C2218/15; C03C2218/152
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A method of producing a multilayer anti-reflection coating with an interference effect for optical purposes upon a substrate, of which at least one layer of the coating has a low refractive index, below n=1.65, and at least one other layer of the coating has a medium refractive index, from n=1.65 to n=1.80, comprising producing the layer of medium refractive value in a vacuum in a reactive atmosphere by depositing upon said substrate a mixture of tantalic oxide and aluminum oxide which has been vaporized by means of an electron gun.
Claim 2
Independent Claim
90 words
A method of producing a multilayer anti-reflection coating with an interference effect for optical purposes upon a substrate, of which at least one layer of the coating has a low refractive index, below n=1.65, and at least one other layer of the coating has a medium refractive index, from n=1.65 to n=1.80, comprising producing the layer of medium refractive value in a vacuum in a reactive atmosphere by depositing upon said substrate a mixture of tantalic oxide and aluminum oxide which has been vaporized by means of an electron gun.
Claim 3
Dependent Claim
26 words
A method according to claim 1 characterized in that at least one of the layers of medium refractive value is the layer next to the substrate.
Claim 4
Dependent Claim
66 words
A method according to claim 1 or 2 characterized in that a first layer of medium refractive value out of a mixture of tantalic oxide and aluminum oxide in a thickness of λ/4, a second layer of high refractive value, above n=1.80, in a thickness of λ/2 and a third layer of low refractive value in a thickness of λ/4 are deposited consecutively on the substrate.
Claim 5
Dependent Claim
52 words
A method according to claim 1 or 2 characterized in that a first layer of medium refractive value out of a mixture of tantalic oxide and aluminum oxide in a thickness of λ/4 and a second layer of low refractive value in a thickness of λ/4 are deposited consecutively on a substrate.
Claim 6
Dependent Claim
39 words
A method according to claim 1 or 2 characterized in that the layer of medium refractive value is formed by depositing a mixture of 25 to 95 wt. % tantalic oxide and 5 to 75 wt. % aluminum oxide.
Claim 7
Dependent Claim
42 words
A method according to claim 3 characterized in that the first layer is a mixture of approximately 30-40 wt. % tantalic oxide and approximately 60-70 wt. % aluminum oxide, the second layer is tantalic oxide and the third layer is magnesium fluoride.
References Cited (Backward Citations)
US3185020A
Cited
US3604784A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-02-07 | 1986-08-09 | 1987-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-02-07 | 1990-08-09 | 1991-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-02-07 | 1994-08-09 | 1995-02-08 | $7700.00 | Window Closed / Lapsed |