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US4602847A
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Method of producing optical elements having interference layers
Assignee: ZAPFE HANS
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Filing: 1984-06-04
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Granted: 1986-07-29
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Expires: 2004-06-04
Abstract
Abstract The invention concerns a method of producing optical elements, in particular filters, with interference layers comprising alternately slightly refractive and highly refractive dielectric layers deposited on a substrate S. The first layer 1 applied to the substrate is Al 2 O 3 , constituting a slightly refractive layer, after which further layers 2 to n of ZnS and Al 2 O 3 are applied in an alternating sequence. The last layer n consists of Al 2 O 3 . Such layers can be applied, at low temperatures, on flat substrates and, in particular, on sharply curved substrates. Production costs are reduced, and these layers possess the optical properties of known interference layers however resistance to external influences is greatly increased. In the case of mineral substrates, the coatings also offer considerable resistance to boiling.
Inventors
- 👤 Reinhard Born
- 👤 Werner Herbert
- 👤 Hans-Georg Lotz
- 👤 Norbert Rucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:29
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/28; G02B5/285
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
79 words
A method of producing optical elements, comprising interference layers of dielectric materials of alternately a low index of refraction and a high index of refraction on organic or inorganic substrates, the method including the steps of applying to the substrate a first layer of Al 2 O 3 having a low index of refraction, applying subsequent layers of ZnS and Al 2 O 3 in an alternating sequence, and applying a final layer of Al 2 O 3 .
Claim 2
Independent Claim
79 words
A method of producing optical elements, comprising interference layers of dielectric materials of alternately a low index of refraction and a high index of refraction on organic or inorganic substrates, the method including the steps of applying to the substrate a first layer of Al 2 O 3 having a low index of refraction, applying subsequent layers of ZnS and Al 2 O 3 in an alternating sequence, and applying a final layer of Al 2 O 3 .
Claim 3
Dependent Claim
24 words
A method according to claim 1, wherein the first layer is applied when the substrate is at a temperature of 20° to 180° C.
Claim 4
Dependent Claim
29 words
A method according to claim 1, wherein the application of the layers is carried out by a vapour deposition process at pressures of between 1.3×10 -3 and 1.05 Pa.
Claim 5
Dependent Claim
39 words
A method according to claim 3, wherein Al 2 O 3 is applied at a vapour deposition rate of between 10 and 15 Å/sec, and ZnS is applied at a vapour deposition rate of between 10 and 30 Å/sec.
Claim 6
Dependent Claim
15 words
The method in accordance with claim 1, in which said optical elements are color-separation filters.
Claim 7
Dependent Claim
15 words
A method in accordance with claim 1, in which said optical elements are cold-light mirrors.
Claim 8
Dependent Claim
15 words
The method in accordance with claim 1, in which said optical elements are heat-reflection elements.
Claim 9
Dependent Claim
16 words
The method in accordance with claim 1, in which said optical elements are color-temperature conversion reflectors.
Claim 10
Dependent Claim
16 words
The method in accordance with claim 1, in which said optical elements are dielectric narrow-band filters.
Claim 11
Dependent Claim
15 words
The method in accordance with claim 1, in which said optical elements are light-beam dividers.
Claim 12
Dependent Claim
13 words
The method in accordance with claim 1, in which said substrates comprise glass.
Claim 13
Dependent Claim
13 words
The method in accordance with claim 1, in which said substrates comprise sapphire.
Claim 14
Dependent Claim
13 words
The method in accordance with claim 1, in which said substrates comprise plastic.
References Cited (Backward Citations)
US2869010A
Cited
US3781090A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-07-28 | 1990-01-27 | 1990-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-07-28 | 1994-01-27 | 1994-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-07-28 | 1998-01-27 | 1998-07-29 | $7700.00 | Window Closed / Lapsed |