GB2047917A - Contact Screen for Graphic Reproduction Processes - Google Patents
Contact Screen for Graphic Reproduction Processes Download PDFInfo
- Publication number
- GB2047917A GB2047917A GB8014332A GB8014332A GB2047917A GB 2047917 A GB2047917 A GB 2047917A GB 8014332 A GB8014332 A GB 8014332A GB 8014332 A GB8014332 A GB 8014332A GB 2047917 A GB2047917 A GB 2047917A
- Authority
- GB
- United Kingdom
- Prior art keywords
- screen
- fields
- contact
- lines
- contact screen
- 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.)
- Withdrawn
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
- G03F5/14—Screening processes; Screens therefor by contact methods
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Formation Of Various Coating Films On Cathode Ray Tubes And Lamps (AREA)
- Mirrors, Picture Frames, Photograph Stands, And Related Fastening Devices (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Spectrometry And Color Measurement (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Abstract
The contact screen on a single light transmitting support film (1) has two or more screen fields (2,3,4,5), each of these screen fields (2,3,4,5) being intended for a different colour component. The screen fields (2,3,4,5) are formed of lines producing a grid, the lines of each screen field (2,3,4,5) being differently inclined relative to the lines of the other screen fields. With the unitary support film (1) carrying two or more screen fields (2,3,4,5), the manufacturing process not only for the contact screen, but also for each of the part-coloured images of different colour components is appreciable rationalised. <IMAGE>
Description
SPECIFICATION
Contact Screen for Graphic Reproduction
Processes
In a graphic reproduction process for colour printing, several part-coloured images of the original are obtained. Each of these part-coloured images consists of a particular colour component of which the choice is made in accordance with the subject-matter of the picture or according to the qualitatively best method in dependence on its wavelength, and is thereby directed to a precisely measurable colour. For the production of the part-coloured image, contact screens are used which permit a variation of the gradation. To this end, there takes place an exposure of each partcoloured image with the intensity of the corresponding colour component, in contact with the transparent contact screen lying thereon.The colour component is obtained from the original with a scanner or with a filter from the photographic image of the original. Until now, the contact screens are connected together with an adhesive tape, in order to obtain a screened separation of two or more colours with screen lines running at different angles.
The invention now consists in that at least the two screens necessary for the different colour components are located on a single support film, as is defined in claim 1. Thereby, the manufacturing process both of the contact screen and of the monochromatic picture is appreciably rationalised.
A practical example of the invention for four colour printing is explained with reference to the following figures. There is shown:
Figure 1 the screen fields on a light transmissive support film of a contact screen, and
Figure 2 a cross-section of the support film with the triangularly formed screen elements.
As can be seen from Figure 1, the screen elements 6, of the individual screen fields 2,3,4,5 extend along straight lines, which form a grid or lattice in each of the screen fields 2,3,4,5. The lines of each of the screen fields 2,3,4,5 are inclined at an angle different from that of the lines of the other screen fields.
In other practical examples, the lines of the screen fields 2,3,4,5 can consist of broken or dotted lines. The form of the grid shown in Figure 1 can be produced by six edged, triangular or other shapes of grid.
The screen fields 2,3,4 and 5 each intended for a colour component are located on an integral light transmitting film 1 of synthetic material and are in direct adjacency with each other. Spacing can however be provided between the individual screen fields.
The contact screen of this construction is produced photographically on a light transmitting synthetic film, which is provided with a photosensitive layer. Such contact screens can be used for example in offset and relief processes, in photography and in typography.
Claims (4)
1. Contact screen for graphic reproduction processes, characterised in that, there are located on a single light transmitting film two or more screen fields, of which each is intended for a respective different colour component.
2. Contact screen according to claim 1, characterised in that, the screen fields are directly adjacent.
3. Contact screen according to claim 1 or 2, characterised in that, the screen elements of the individual screen fields extend along lines, such that the lines of each screen field are differently inclined relative to the lines of the other screen fields.
4. A contact screen for use in a graphic reproduction process, substantially as herein described with reference to the accompanying drawing.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CH442879 | 1979-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2047917A true GB2047917A (en) | 1980-12-03 |
Family
ID=4275948
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8014332A Withdrawn GB2047917A (en) | 1979-05-11 | 1980-04-30 | Contact Screen for Graphic Reproduction Processes |
Country Status (8)
| Country | Link |
|---|---|
| BR (1) | BR6000516U (en) |
| DD (1) | DD150264A5 (en) |
| ES (1) | ES250644Y (en) |
| FR (1) | FR2456341A1 (en) |
| GB (1) | GB2047917A (en) |
| IL (1) | IL60013A0 (en) |
| NL (1) | NL8002649A (en) |
| SE (1) | SE8003505L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578156A (en) * | 1994-01-07 | 1996-11-26 | Sumitomo Electric Industries, Ltd. | Method of mounting a lens on a light emitting diode |
-
1980
- 1980-04-28 DD DD80220739A patent/DD150264A5/en unknown
- 1980-04-28 FR FR8009502A patent/FR2456341A1/en not_active Withdrawn
- 1980-04-30 GB GB8014332A patent/GB2047917A/en not_active Withdrawn
- 1980-05-06 IL IL60013A patent/IL60013A0/en unknown
- 1980-05-08 BR BR6000516U patent/BR6000516U/en unknown
- 1980-05-08 NL NL8002649A patent/NL8002649A/en not_active Application Discontinuation
- 1980-05-09 SE SE8003505A patent/SE8003505L/en not_active Application Discontinuation
- 1980-05-09 ES ES1980250644U patent/ES250644Y/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5578156A (en) * | 1994-01-07 | 1996-11-26 | Sumitomo Electric Industries, Ltd. | Method of mounting a lens on a light emitting diode |
Also Published As
| Publication number | Publication date |
|---|---|
| BR6000516U (en) | 1980-11-11 |
| SE8003505L (en) | 1980-11-12 |
| IL60013A0 (en) | 1980-07-31 |
| ES250644Y (en) | 1981-04-16 |
| NL8002649A (en) | 1980-11-13 |
| FR2456341A1 (en) | 1980-12-05 |
| ES250644U (en) | 1980-11-16 |
| DD150264A5 (en) | 1981-08-19 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |