DE1255492B - Contact grid for reproduction purposes and process for its manufacture - Google Patents
Contact grid for reproduction purposes and process for its manufactureInfo
- Publication number
- DE1255492B DE1255492B DEM57522A DEM0057522A DE1255492B DE 1255492 B DE1255492 B DE 1255492B DE M57522 A DEM57522 A DE M57522A DE M0057522 A DEM0057522 A DE M0057522A DE 1255492 B DE1255492 B DE 1255492B
- Authority
- DE
- Germany
- Prior art keywords
- grid
- density
- lines
- surface elements
- diaphragm
- 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- Withdrawn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
- 238000004519 manufacturing process Methods 0.000 title description 4
- 238000000034 method Methods 0.000 title description 4
- 230000007423 decrease Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims 1
- 230000003287 optical effect Effects 0.000 claims 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
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
- G03F5/16—Screening processes; Screens therefor by contact methods using grey half-tone screens
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Elements Other Than Lenses (AREA)
- Silver Salt Photography Or Processing Solution Therefor (AREA)
- Photosensitive Polymer And Photoresist Processing (AREA)
Description
DEUTSCHES GERMAN WTTWl- WTTWl- PATENTAMTPATENT OFFICE
AUSLEGESCHRIFTEDITORIAL
DeutscheKl.: 57 d-8/02 German class: 57 d- 8/02
Nummer: 1 255 492Number: 1 255 492
Aktenzeichen: M 57522IX a/57 dFile number: M 57522IX a / 57 d
J 255492 Anmeldetag: 17.Juli 1963J 255492 Filing date: July 17, 1963
Auslegetag: 30. November 1967Open date: November 30, 1967
Die Erfindung betrifft einen Kontaktraster für Reproduktionszwecke und ein bevorzugtes Verfahren zu seiner Herstellung.The invention relates to a contact grid for reproduction purposes and a preferred method for its manufacture.
Es sind Kontaktraster für Reproduktionszwecke bekannt, welche ein Linienmuster aus einzelnen Punkten aufweisen, die jeweils die Form eines zentralen Kernes mit einem Mittelpunkt maximaler Dichte haben. Bei diesen bekannten Kontaktrastern ist die Schärfe der Reproduktion von der Anzahl der Rasterpunkte pro Flächeneinheit abhängig.There are contact grids for reproduction purposes known, which a line pattern from individual Have points, each of which has the shape of a central core with a center point of maximum Have density. With these known contact grids, the sharpness of the reproduction depends on the number of Grid points per unit area dependent.
Die Erfindung hat die Schaffung eines Kontaktrasters für Reproduktionszwecke zum Ziel, welcher bei gleicher Anzahl von Rasterpunkten pro Flächeneinheit eine schärfere Wiedergabe als die bekannten Kontaktraster gewährleistet.The invention aims to provide a contact screen for reproduction purposes, which with the same number of grid points per unit area, a sharper reproduction than the known ones Contact grid guaranteed.
Hierzu sieht die Erfindung vor, daß die Punkte des Rasters einen zentralen Kern hoher Dichte aufweisen, der von einem schachbrettartigen Muster umgeben ist, in welchem Flächenelemente minimaler Dichte mit Flächenelementen abwechseln, deren Dichte mit wachsendem Abstand von dem zentralen Kern abnimmt. Die Rasterpunkte des erfindungsgemäßen Kontaktrasters weisen also eine Feinstruktur auf, die bei der Reproduktion von Linienelementen insofern von Vorteil ist, als die im gerasterten Bild erzeugten Rasterpunkte in Richtung des Linienelementes deformiert sind und dieses somit schärfer wiedergeben als die mit einem herkömmlichen Kontaktraster erzeugten, in ihrer Form durch ein wiederzugebendes Linienelement nicht merklich beeinflußten Rasterpunkte. Bevorzugt ist die Ausbildung des erfindungsgemäßen Kontaktrasters so, daß in der Mitte jedes von vier benachbarten Rasterpunkten gebildeten Quadrats eine zusammenhängende Fläche minimaler Dichte liegt, die eine Mehrzahl von Flächenelementen umfaßt. Vorzugsweise umfaßt auch der zentrale Kern eine Mehrzahl von Flächenelementen. For this purpose, the invention provides that the points of the grid have a central core of high density, which is surrounded by a checkerboard pattern in which surface elements of minimal density alternate with surface elements, the density of which decreases with increasing distance from the central core. The grid points of the contact grid according to the invention thus have a fine structure, which is advantageous in the reproduction of line elements as it is in the rasterized image generated grid points are deformed in the direction of the line element and thus sharper reproduced than those generated with a conventional contact grid, in their shape by a reproduced Line element not noticeably influenced grid points. Training is preferred of the contact grid according to the invention so that in the middle each of four adjacent grid points formed square is a contiguous area of minimum density, which is a plurality of Includes surface elements. The central core preferably also comprises a plurality of surface elements.
Die Erfindung hat auch ein Verfahren zur Herstellung eines solchen Kontaktrasters mit Hilfe einer beleuchteten Lochblende und eines im Abstand von einer lichtempfindlichen Schicht angeordneten Kreuzlinienrasters zum Gegenstand. Dieses Verfahren verläuft erfindungsgemäß derart, daß in einem Belichtungsschritt eine Lochblende verwendet wird, die wenigstens eine zentrale, größere öffnung und eine Vielzahl kleiner Öffnungen aufweist, und daß in einem zweiten Belichtungsschritt eine Blende verwendet wird, die eine Anzahl von Öffnungen in Form von konzentrischen Banden aufweist, deren Breite von der Mitte zu den Rändern der Blende abnimmt.The invention also has a method for producing such a contact grid with the aid of a illuminated pinhole and a cross-line grid arranged at a distance from a light-sensitive layer to the subject. According to the invention, this method takes place in one exposure step a perforated diaphragm is used, which has at least one central, larger opening and one Has a plurality of small openings, and that a diaphragm is used in a second exposure step which has a number of openings in the form of concentric bands, their Width decreases from the center to the edges of the bezel.
Kontaktraster für Reproduktionszwecke
und Verfahren zu seiner HerstellungContact grid for reproduction purposes
and its method of manufacture
Anmelder:Applicant:
Herbert Middlemiss,Herbert Middlemiss,
Nottingham, Nottinghamshire;Nottingham, Nottinghamshire;
W. H. Howson Limited,W. H. Howson Limited,
Leeds, Yorkshire (Großbritannien)Leeds, Yorkshire (UK)
Vertreter:Representative:
Dr. W. Müller-Bore und Dipl.-Ing. H. Gralfs,
Patentanwälte, München 22, Robert-Koch-Str. 1Dr. W. Müller-Bore and Dipl.-Ing. H. Gralfs,
Patent Attorneys, Munich 22, Robert-Koch-Str. 1
Als Erfinder benannt:
Herbert Middlemiss,Named as inventor:
Herbert Middlemiss,
Nottingham, Nottinghamshire (Großbritannien)Nottingham, Nottinghamshire (UK)
Beanspruchte Priorität:Claimed priority:
Großbritannien vom 17. Juli 1962 (27 340)Great Britain 17 July 1962 (27,340)
Die Erfindung wird im folgenden beispielsweise an Hand der Zeichnung beschrieben; in dieser zeigtThe invention is described below, for example, with reference to the drawing; in this shows
Fig. 1 eine schematische Darstellung eines Ausschnittes eines Kontaktrasters gemäß der Erfindung,1 shows a schematic representation of a section of a contact grid according to the invention,
F i g. 2 einen etwas vergrößerten Ausschnitt des in F i g. 1 dargestellten Rasters,F i g. 2 shows a somewhat enlarged section of the FIG. 1 grid shown,
F i g. 3 ein Diagramm der Dichteverteilung jedes Rasterpunktes in Abhängigkeit von seiner Breite,F i g. 3 shows a diagram of the density distribution of each raster point as a function of its width,
F i g. 4 eine schematische perspektivische Wiedergabe der Anordnung zur Erzeugung eines erfindungsgemäßen Rasters beim ersten Belichtungsschritt,F i g. 4 is a schematic perspective representation of the arrangement for producing one according to the invention Raster at the first exposure step,
F i g. 5 eine der F i g. 4 entsprechende Darstellung zur Veranschaulichung der Bildung mehrerer Rasterpunkte undF i g. 5 one of the F i g. 4 corresponding representation to illustrate the formation of several grid points and
Fig. 6 eine schematische perspektivische Darstellung der beim zweiten Belichtungsschritt verwendeten Anordnung.Fig. 6 is a schematic perspective illustration of those used in the second exposure step Arrangement.
Fig. 1 zeigt einen Ausschnitt eines erfindungsgemäßen Kontaktrasters. Jeder Rasterpunkt weist einen zentralen KernE auf, der von einer Anzahl rechteckiger Flächenelemente F umgeben ist. Die Dichte des zentralen Kernes und der Flächenelemente F nimmt mit wachsender Entfernung von dem Mittelpunkt des zentralen Kernes ab. Diese Abnahme ist in der Schwarzweißzeichnung nicht erkennbar; in Wirklichkeit hat jedoch das Flächenelement an jeder Ecke eines Rasterpunktes eine derart geringeFig. 1 shows a section of a contact grid according to the invention. Each grid point has a central core E, which is surrounded by a number of rectangular surface elements F. The density of the central core and the surface elements F decreases with increasing distance from the center of the central core. This decrease cannot be seen in the black and white drawing; in reality, however, the surface element at each corner of a grid point is so small
709 690/306709 690/306
Claims (2)
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB27340/62A GB986419A (en) | 1962-07-17 | 1962-07-17 | Improvements in or relating to photographic half-tone contact screens |
Publications (1)
Publication Number | Publication Date |
---|---|
DE1255492B true DE1255492B (en) | 1967-11-30 |
Family
ID=10257990
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEM57522A Withdrawn DE1255492B (en) | 1962-07-17 | 1963-07-17 | Contact grid for reproduction purposes and process for its manufacture |
Country Status (4)
Country | Link |
---|---|
US (1) | US3275445A (en) |
BE (1) | BE635095A (en) |
DE (1) | DE1255492B (en) |
GB (1) | GB986419A (en) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3885971A (en) * | 1973-08-01 | 1975-05-27 | Fuji Photo Film Co Ltd | Contact screen and method for nonlinear transformations and filtering in coherent optical systems |
US4600666A (en) * | 1983-01-12 | 1986-07-15 | Zink Edmund S | Integrated photoscreen for making a halftone reproduction printing plate from a photograph |
DE3339396A1 (en) * | 1983-10-29 | 1985-05-09 | Helmut 4800 Bielefeld Jahn | Contact screen for reproduction technology |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE15494C (en) * | WÜRTTEMBERGISCHE METALLWAARENFABRIK in Geifslingen | Innovations in the manufacture of copper-clad iron sheets | ||
CH31757A (en) * | 1905-01-27 | 1905-08-31 | Theodor Dittmann | Grid for making autotypes |
GB286340A (en) * | 1926-11-04 | 1928-03-05 | Arthur Ronald Trist | Improvements in and relating to screens for photographic purposes, photo mechanical printing processes and the like |
US1995958A (en) * | 1933-03-03 | 1935-03-26 | Photo Cast Inc | Universal screen for preparing half-tones |
DE716362C (en) * | 1940-08-21 | 1942-01-31 | Johannes Wimmer | Process for producing master copies for autotypical gravure printing |
GB628872A (en) * | 1946-05-18 | 1949-09-06 | Kodak Ltd | Improved method of manufacturing contact half-tone screens |
DE1105721B (en) * | 1959-09-22 | 1961-04-27 | Herbst & Illig | Contact gravure screen |
GB889107A (en) * | 1955-06-23 | 1962-02-07 | Hermann Eckerlin | Improvements in or relating to contact screens for use in graphic reproduction |
-
0
- BE BE635095D patent/BE635095A/xx unknown
-
1962
- 1962-07-17 GB GB27340/62A patent/GB986419A/en not_active Expired
-
1963
- 1963-07-15 US US295101A patent/US3275445A/en not_active Expired - Lifetime
- 1963-07-17 DE DEM57522A patent/DE1255492B/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE15494C (en) * | WÜRTTEMBERGISCHE METALLWAARENFABRIK in Geifslingen | Innovations in the manufacture of copper-clad iron sheets | ||
CH31757A (en) * | 1905-01-27 | 1905-08-31 | Theodor Dittmann | Grid for making autotypes |
GB286340A (en) * | 1926-11-04 | 1928-03-05 | Arthur Ronald Trist | Improvements in and relating to screens for photographic purposes, photo mechanical printing processes and the like |
US1995958A (en) * | 1933-03-03 | 1935-03-26 | Photo Cast Inc | Universal screen for preparing half-tones |
DE716362C (en) * | 1940-08-21 | 1942-01-31 | Johannes Wimmer | Process for producing master copies for autotypical gravure printing |
GB628872A (en) * | 1946-05-18 | 1949-09-06 | Kodak Ltd | Improved method of manufacturing contact half-tone screens |
GB889107A (en) * | 1955-06-23 | 1962-02-07 | Hermann Eckerlin | Improvements in or relating to contact screens for use in graphic reproduction |
DE1105721B (en) * | 1959-09-22 | 1961-04-27 | Herbst & Illig | Contact gravure screen |
Also Published As
Publication number | Publication date |
---|---|
GB986419A (en) | 1965-03-17 |
BE635095A (en) | |
US3275445A (en) | 1966-09-27 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
E771 | Valid patent as to the heymanns-index 1977, willingness to grant licences | ||
EHJ | Ceased/non-payment of the annual fee |