GB551548A - Improvements in non-reflecting coatings - Google Patents
Improvements in non-reflecting coatingsInfo
- Publication number
- GB551548A GB551548A GB18441A GB18441A GB551548A GB 551548 A GB551548 A GB 551548A GB 18441 A GB18441 A GB 18441A GB 18441 A GB18441 A GB 18441A GB 551548 A GB551548 A GB 551548A
- Authority
- GB
- United Kingdom
- Prior art keywords
- refractive index
- diffused
- cellulose
- coating
- base
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/113—Anti-reflection coatings using inorganic layer materials only
- G02B1/115—Multilayers
Landscapes
- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Laminated Bodies (AREA)
Abstract
551,548. Non-reflecting coatings; glass; antihalation films. KODAK, Ltd. (Eastman Kodak Co.). Jan. 6, 1941, No. 184. [Classes 97 (i) and 98 (ii)] [Also in Group XXIII] An article of low reflectivity comprises a transparent body, e.g. of glass or film base, of relatively low refractive index, e,g. less than 1.5, a superimposed layer of transparent material, e.g. urea-formaldehyde resin or polystyrene of relatively high refractive index gradually diffused into the body to avoid a sharp reflecting surface and having a thickness greater than one quarter the wavelength of the light for which low reflectivity is desired and an upper layer or layers of a transparent material, e.g. ethyl cellulose or cellulose caproate having such a low refractive index and of such a thickness as to reduce reflectivity by interference. The diffused coating may comprise a number of layers each of lower refractive index than the last. A subbing may be applied between the base and this coating and, if of the same refractive index as the base, need not be diffused. As shown a cellulose acetate-propionate base 46 provided with an emulsion layer 47 is coated with a subbing 48 of cellulose nitrate having the same index of refraction and a coating of ureaformaldehyde resin 49 is diffused into the subbing by the use of a common solvent e.g. 20 per cent acetone, 60 per cent methanol and 20 per cent ethylene dichloride or equal parts of acetone and ethylene dichloride. A further coating of ureaformaldehyde resin 50 in a chlorinated hydrocarbon is applied, followed by a top coa'ing of cellulose caproate 51 one quarter wave-length thick. Other combinations described are a cellulose acetate base, a subbing of alkyl-toluene-psulnhonamide-formaldehyde resin, a high refractive index diffused layer of polystyrene and an overcoating of cellulose caproate or ethyl cellulose ; and a flint glass body into which is diffused a glass of high refractive index by heating in contact for some time, with an upper coating of low refractive index.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18441A GB551548A (en) | 1941-01-06 | 1941-01-06 | Improvements in non-reflecting coatings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB18441A GB551548A (en) | 1941-01-06 | 1941-01-06 | Improvements in non-reflecting coatings |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB551548A true GB551548A (en) | 1943-03-01 |
Family
ID=9699876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB18441A Expired GB551548A (en) | 1941-01-06 | 1941-01-06 | Improvements in non-reflecting coatings |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB551548A (en) |
-
1941
- 1941-01-06 GB GB18441A patent/GB551548A/en not_active Expired
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