WO1997041487A1 - Method of producing a screened picture - Google Patents
Method of producing a screened picture Download PDFInfo
- Publication number
- WO1997041487A1 WO1997041487A1 PCT/SE1997/000717 SE9700717W WO9741487A1 WO 1997041487 A1 WO1997041487 A1 WO 1997041487A1 SE 9700717 W SE9700717 W SE 9700717W WO 9741487 A1 WO9741487 A1 WO 9741487A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- light
- stochastic
- picture
- screen
- film
- Prior art date
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
- G03F5/22—Screening processes; Screens therefor combining several screens; Elimination of moiré
-
- 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
- G03F5/02—Screening processes; Screens therefor by projection methods
- G03F5/12—Screening processes; Screens therefor by projection methods using other screens, e.g. granulated screen
-
- 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
Definitions
- the present invention relates to a method of producing with the aid of exposure a screened image of a picture on the light-sensitive layer of a film, a plate, etc.
- Stochastic screens i.e. screens with randomly distributed dots, are pre ⁇ viously known and are currently used primarily for eliminating moire patterns.
- the object of the present invention is to establish a method of pro ⁇ ducing large screened images, which are equally sharp regardless of the degree of enlargement.
- the present invention is characterized in that it incorporates utilization of at least one screen with randomly distributed, distinct dots, called a stochastic screen, which is located ahead of the said film, plate, etc., on which the said screened image of the said picture is intended to be created, and in that the tones of the said stochastic screen are located in direct contact with the light-sensitive layer of the said film, plate, etc.
- the present invention is characterized in that the said picture is exposed several times on the same film while utilizing a plurality of stochastic screens with differing permeabilities to light and in that a plu ⁇ rality of stochastic screens with differing permeabilities to light are used primarily for light and dark parts respectively of the said picture.
- a suitably dimensioned camera incorporates i.a. by way of example light sources 1 for illumination of a suitable and adapted picture 2 in the form of, for example, a negative picture, a positive picture, etc. Via suit ⁇ able and preferably adjustable lenses, 3,4, an image of the said picture 2 is exposed on a flat surface 7.
- This flat surface 7 is provided with a large number of thoroughgoing holes 7a-7z, to which a negative pressure is supplied from a vacuum source in a manner not specified to the left side of the flat surface 7, as seen in Fig. 1.
- a light-sensitive film 6 is applied to the left side of the flat surface 7, as seen in Fig. 1, and is retained located closely against the flat surface 7 with the aid of the said negative pressure from some of the said holes 7g- 7p.
- the distance between the holes 7a-7z for supplying negative pres ⁇ sure to the left side of the flat surface 7, as seen in Fig. 1, as well as the size of the said holes are so chosen that the do not have any appreciable influence on the flatness of the light-sensitive film 6.
- the light-sensing layer 6a of the light-sensitive film 6 faces away from the flat surface 7, i.e. towards the light rays coming from the light sources 1 via the picture 2 and the lenses 3, 4.
- a screen 5 of the type which is built up of distinct dots or pixels randomly distributed over the entire surface of the screen and called stochastic screens here is located in the beam direction seen before the light-sensitive film 6 and with its toner or blacking layer 5a facing towards the light-sensitive layer 6a of the film 6, i.e. so that there is direct contact between the light-sensitive layer 6a of the film 6 and the toner layer 5a of the stochastic screen 5.
- This stochastic screen 5 is chosen larger in size than the light-sensitive film 6, as is indicated sketched in the figure, and is retained also with the aid of the said negative pressure from, for example, holes 7e-7u against the flat surface 7.
- both the film 6 and the stochastic screen 5 are preferably soft and flexible and adapt themselves therefore both to each other and to the flat surface 7. It should be particularly observed in this context that the distinct dots 5a of the stochastic screen 5 can in themselves have identical or different shapes but that they are discrete, i.e. they are sharply delimited both individually and mutually and that these dots are randomly distributed over the screen.
- a first stochastic screen with about 60- 70% permeability to light can be used, for example, for the dark parts of the picture 2, which dark points can for example be defined as being impermeable to light from about 99-30%.
- a second stochastic screen with about 70-90% permeability to light can be used, for example, for the light parts of the picture 2, which light points can for example be defined as being impermeable to light from about 30-1%.
- several stochastic screens can be used repeatedly as well as also exposure without screens, for example between two to four stages.
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Preparing Plates And Mask In Photomechanical Process (AREA)
- Manufacture Or Reproduction Of Printing Formes (AREA)
- Facsimile Image Signal Circuits (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP97921067A EP0951662A1 (en) | 1996-04-30 | 1997-04-29 | Method of producing a screened picture |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9601662-1 | 1996-04-30 | ||
SE9601662A SE507719C2 (en) | 1996-04-30 | 1996-04-30 | Ways to produce a halftone image |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1997041487A1 true WO1997041487A1 (en) | 1997-11-06 |
Family
ID=20402414
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/SE1997/000717 WO1997041487A1 (en) | 1996-04-30 | 1997-04-29 | Method of producing a screened picture |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0951662A1 (en) |
SE (1) | SE507719C2 (en) |
WO (1) | WO1997041487A1 (en) |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5283154A (en) * | 1990-10-24 | 1994-02-01 | National Printing And Packaging Company | Random screen waterless printing process |
EP0658040A1 (en) * | 1993-12-10 | 1995-06-14 | Crosfield Electronics Limited | Method and apparatus for generating an output device control signal |
WO1996002868A1 (en) * | 1994-07-13 | 1996-02-01 | Nouel Jean Marie | Use of frequency-modulated screening for lightening offset printing surfaces |
-
1996
- 1996-04-30 SE SE9601662A patent/SE507719C2/en not_active IP Right Cessation
-
1997
- 1997-04-29 EP EP97921067A patent/EP0951662A1/en not_active Ceased
- 1997-04-29 WO PCT/SE1997/000717 patent/WO1997041487A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5283154A (en) * | 1990-10-24 | 1994-02-01 | National Printing And Packaging Company | Random screen waterless printing process |
US5283154B1 (en) * | 1990-10-24 | 1996-05-07 | Nat Printing And Packaging Com | Random screen waterless printing process |
EP0658040A1 (en) * | 1993-12-10 | 1995-06-14 | Crosfield Electronics Limited | Method and apparatus for generating an output device control signal |
WO1996002868A1 (en) * | 1994-07-13 | 1996-02-01 | Nouel Jean Marie | Use of frequency-modulated screening for lightening offset printing surfaces |
Also Published As
Publication number | Publication date |
---|---|
SE507719C2 (en) | 1998-07-06 |
SE9601662L (en) | 1997-10-31 |
EP0951662A1 (en) | 1999-10-27 |
SE9601662D0 (en) | 1996-04-30 |
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