GB474911A - Improvements in or relating to the manufacture of half-tone screen negatives or positives for photo-mechanical printing processes - Google Patents
Improvements in or relating to the manufacture of half-tone screen negatives or positives for photo-mechanical printing processesInfo
- Publication number
- GB474911A GB474911A GB13164/36A GB1316436A GB474911A GB 474911 A GB474911 A GB 474911A GB 13164/36 A GB13164/36 A GB 13164/36A GB 1316436 A GB1316436 A GB 1316436A GB 474911 A GB474911 A GB 474911A
- Authority
- GB
- United Kingdom
- Prior art keywords
- emulsion
- support
- layers
- exposed
- stratum
- 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
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
- G03F5/00—Screening processes; Screens therefor
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Printing Methods (AREA)
Abstract
474,911. Photo-mechanical printing- surfaces. KODAK, Ltd. May 9, 1936, No. 13164. Convention date, May 21, 1935. Drawings to Specification. [Class 98 (ii)] A sensitive element for preparing reliefprinting plates comprises a support bearing one or more sensitive layers, one layer, or a stratum of a single layer where only one is used, having formed therein a latent screen image of dots of uniform size and density but each graded in density from a maximum at the centre to a minimum at the periphery. A continuous tone image is subsequently recorded in another layer or stratum. The dot image may be recorded in the upper stratum of a single layer, the continuous-tone image being printed through the support, which may be coloured to limit the penetration of the light. Alternatively the emulsion may be coloured with a dye which is removed in the processing. In place of a single layer, two superimposed layers or two layers arranged on opposite sides of the support may be used. The emulsion layers may be sensitized to different regions of the spectrum, e.g. one to green and the other to red or infra-red, printing being effected with appropriate lights. In one example, a yellow dyed silver halide emulsion of low gamma coated on a support of cellulose nitrate is exposed through the support to a 65-line screen spaced from the emulsion. The emulsion side is then exposed in a contact printing frame to a negative of the subject. The resulting film is developed in a solution of metol, hydroquinone, sodium sulphite, sodium carbonate and potassium bromide and the positive formed is then printed by contact through the support onto a film having an emulsion of high gamma and the resulting negative developed with a solution of trioxymethylene, hydroquinone, sodium sulphite, sodium metabisulphite, boric acid, and potassium bromide. The material may also be exposed in a camera.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US22577A US2102021A (en) | 1935-05-21 | 1935-05-21 | Photographic half-tone screen material and process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB474911A true GB474911A (en) | 1937-11-09 |
Family
ID=21810299
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB13164/36A Expired GB474911A (en) | 1935-05-21 | 1936-05-09 | Improvements in or relating to the manufacture of half-tone screen negatives or positives for photo-mechanical printing processes |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US2102021A (en) |
| DE (1) | DE698994C (en) |
| FR (1) | FR807162A (en) |
| GB (1) | GB474911A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE510032A (en) * | 1951-03-21 | |||
| GB699659A (en) * | 1952-06-04 | 1953-11-11 | Kodak Ltd | Photographic material for making half-tone records |
| US2912326A (en) * | 1954-04-09 | 1959-11-10 | Eastman Kodak Co | Direct positive prescreened photographic material |
| US2912328A (en) * | 1954-04-09 | 1959-11-10 | Eastman Kodak Co | Direct positive prescreened photographic material |
| US2912327A (en) * | 1954-04-09 | 1959-11-10 | Eastman Kodak Co | Prescreened negative photographic material |
-
1935
- 1935-05-21 US US22577A patent/US2102021A/en not_active Expired - Lifetime
-
1936
- 1936-05-09 GB GB13164/36A patent/GB474911A/en not_active Expired
- 1936-05-20 FR FR807162D patent/FR807162A/en not_active Expired
- 1936-05-21 DE DE1936K0142280 patent/DE698994C/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| DE698994C (en) | 1940-11-21 |
| US2102021A (en) | 1937-12-14 |
| FR807162A (en) | 1937-01-06 |
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