US3777633A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Structure for making phase filters
Assignee: International Business Machines Corp
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Filing: 1972-02-25
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Granted: 1973-12-11
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Expires: 1992-02-25
Abstract
Abstract A high fidelity phase filter is made from a composite structure composed of a negative photopolymer, preferably a photoresist, layer which is affixed to a photoemulsion substrate in an optically flat and non-opaque coupling relationship. The photopolymer layer has a developed relief image which is derived by exposure of the photopolymer layer through a previously recorded and developed optical density image in the photoemulsion. The density image, and consequently the resultant relief image derived therefrom, is related to the phase modulation desired for the filter. The structure may be used as a master from which filters of the transmissive and/or reflective types are made by conventional mechanical reproduction techniques. Alternatively, it may be used as an integral part of the filter per se by affixing a reflective coating to the surface of the photopolymer layer, in which case the filter is of the reflective type.
Inventors
- 👤 J Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 01:29
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095; G03F7/0952; G02; G02B; G02B5/00; G02B5/18; G02B5/1847; G02B5/1857; G03F7/0005; G03F7/001
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
108 words
Apparatus for making a high fidelity phase filter with a predetermined phase modulation characteristic, said apparatus comprising: photoemulsion substrate means having a developed optical density image recorded therein related to said phase modulated characteristic, negative type photopolymer layer means affixed to said photoemulsion substrate means in an optically flat and nonopaque coupling relationship, said photopolymer layer means having a developed relief image derived by exposure of said photopolymer layer through said density image of said photoemulsion substrate means, said relief image being utilized to provide said phase modulation characteristic for said filter, and means for affixing said photopolymer layer means to said photoemulsion substrate means in said relationship.
Claim 2
Dependent Claim
108 words
Apparatus for making a high fidelity phase filter with a predetermined phase modulation characteristic, said apparatus comprising: photoemulsion substrate means having a developed optical density image recorded therein related to said phase modulated characteristic, negative type photopolymer layer means affixed to said photoemulsion substrate means in an optically flat and nonopaque coupling relationship, said photopolymer layer means having a developed relief image derived by exposure of said photopolymer layer through said density image of said photoemulsion substrate means, said relief image being utilized to provide said phase modulation characteristic for said filter, and means for affixing said photopolymer layer means to said photoemulsion substrate means in said relationship.
Claim 3
Dependent Claim
15 words
Apparatus according to claim 1 wherein said photopolymer layer means is of the photoresist type.
Claim 4
Dependent Claim
32 words
Apparatus according to claim 1 wherein said filter is of the reflective type said structural apparatus further comprising reflective coating means coating said relief image and coacting therewith to provide said filter.
Claim 5
Dependent Claim
18 words
Apparatus according to claim 1 wherein said structural apparatus is a master member for making said filter therefrom.
Claim 6
Independent Claim
125 words
The method of making a high fidelity phase filter with a predetermined phase modulation characteristic, said method comprising the steps of: providing photoemulsion substrate means having a developed optical density image recorded therein related to said phase modulation characteristic, providing affixing means for affixing negative type unexposed photopolymer layer means to said photoemulsion substrate means in an optically flat and non-opaque coupling relationship, affixing said layer means to said substrate means in said relationship by said affixing means, exposing said photopolymer layer means through said optical density image of said photoemulsion substrate means, and developing said photopolymer layer means to develop a relief image therein proportional to the optical density image, said relief image being utilized to provide said phase modulation characteristic for said filter.
Claim 7
Independent Claim
125 words
The method of making a high fidelity phase filter with a predetermined phase modulation characteristic, said method comprising the steps of: providing photoemulsion substrate means having a developed optical density image recorded therein related to said phase modulation characteristic, providing affixing means for affixing negative type unexposed photopolymer layer means to said photoemulsion substrate means in an optically flat and non-opaque coupling relationship, affixing said layer means to said substrate means in said relationship by said affixing means, exposing said photopolymer layer means through said optical density image of said photoemulsion substrate means, and developing said photopolymer layer means to develop a relief image therein proportional to the optical density image, said relief image being utilized to provide said phase modulation characteristic for said filter.
Claim 8
Dependent Claim
16 words
The method according to claim 5 wherein said photopolymer layer means is of the photoresist type.
Claim 9
Dependent Claim
27 words
The method according to claim 5 further comprising the step of: providing a reflective coating means to said relief image to coact therewith to provide said filter.
Claim 10
Dependent Claim
24 words
The method according to claim 5 further comprising the step of: reproducing the relief image of said structural apparatus in the filter made therefrom.
References Cited (Backward Citations)
US3669673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |