DE600568C - Process for the production of printing forms by means of a wash-out relief produced by photographic means - Google Patents
Process for the production of printing forms by means of a wash-out relief produced by photographic meansInfo
- Publication number
- DE600568C DE600568C DEG79726D DEG0079726D DE600568C DE 600568 C DE600568 C DE 600568C DE G79726 D DEG79726 D DE G79726D DE G0079726 D DEG0079726 D DE G0079726D DE 600568 C DE600568 C DE 600568C
- Authority
- DE
- Germany
- Prior art keywords
- emulsion
- production
- wash
- printing forms
- filter
- 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
- G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
- G03F7/20—Exposure; Apparatus therefor
- G03F7/2002—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image
- G03F7/2008—Exposure; Apparatus therefor with visible light or UV light, through an original having an opaque pattern on a transparent support, e.g. film printing, projection printing; by reflection of visible or UV light from an original such as a printed image characterised by the reflectors, diffusers, light or heat filtering means or anti-reflective means used
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optical Filters (AREA)
Description
Verfahren zur Herstellung von Druckformen mittels eines auf photographischem Wege erzeugten Auswaschreliefs Gegenstand des Patents 599 897 ist ein Verfahren zur Herstellung von Druckformen mittels eines auf photographischem Wege erzeugten Auswaschreliefs, bei welchem eine transparente, das Licht wenig streuende Emulsionsschicht in einer Dicke von mindestens o,o3 mm verwendet wird. Praktisch kommt es aber nicht bloß darauf an, daß die Emulsionsschicht eine ausreichende Dicke hat, sondern vor allem auch darauf, daß die Schichtdicke so vollständig als möglich ausgenutzt wird, d. h. daß das photographische Bild sich so tief als möglich in die Schicht hinein erstreckt. Auch wenn man, wie in der Hauptpatentschrift offenbart ist, das Relief durch Anlagerung von Uran- oder ähnlichen Verbindungen überhöht, ist es vorteilhaft,, das Silber bis tief in die Schicht hineinreichen zu lassen.Process for the production of printing forms by means of a photographic Ways to create washout reliefs. The subject of patent 599 897 is a method for the production of printing forms by means of a photographic method Wash-out reliefs with a transparent emulsion layer that does not scatter light is used in a thickness of at least 0.03 mm. But it is not practical just insist that the emulsion layer has a sufficient thickness, but rather before above all, that the layer thickness is used as completely as possible, d. H. that the photographic image extends as deeply as possible into the layer extends. Even if, as is disclosed in the main patent specification, the relief excessive by the accumulation of uranium or similar compounds, it is advantageous to to let the silver reach deep into the layer.
Es hat sich gezeigt, daß es nicht ohne weiteres möglich ist, ein derartiges photographisches Bild einwandfrei zu erzeugen. Belichtet man nämlich entsprechend lange, so gelingt es zwar, die Schicht bis zum Grunde durchzubelichten, jedoch tritt bei dieser langen Belichtung innerhalb der Schicht eine hochgradige Streuung ein, unter der die Schärfe des Bildes beträchtlich leidet. Im vorliegenden Fall handelt es sich nun um die Wiedergerbe von Autotypien mit feinstem Punktraster. Bei solchen stört die Unschärfe außerordentlich. Denn der Reproduktionstechniker stellt bekanntlich gerade an die Schärfe des Rasterpunktes besonders hohe Ansprüche.It has been shown that it is not readily possible to do such a thing to produce a photographic image flawlessly. Namely, one exposes accordingly long, it is possible to expose the layer right through to the bottom, but it occurs a high degree of scattering within the layer during this long exposure, under which the sharpness of the picture suffers considerably. In the present case it acts it is now about the re-tanning of autotypes with the finest dot matrix. In such the blurring disturbs extraordinarily. Because, as is well known, the reproductive technician provides Particularly high demands are placed on the sharpness of the halftone dot.
Gemäß der Erfindung wird aus dem Umstand Nutzen gezogen, daß die lichtempfindliche Emulsion für langwelliges Licht bedeutend durchlässiger ist als für kurzwelliges; z. B. ist nach den Messungen von B. M. R ae und C. T o 1 m a n die Durchlässigkeit für Rot fünfmal so groß wie für Blau, siehe Photographische Industrie, 193o, Nr. 53. Demgemäß wird die Belichtung nicht bei beliebigem Licht, .etwa dem einer. Glühlampe o. dgl., ,vorgenommen, sondern unter Vorschaltung eines Filters, das nur langwellige Strahlen durchläßt. Diese Strahlen dringen bis in größere Tiefe der lichtempfindlichen Schicht. Außerdem wird durch die Ausschaltung der blauen Strahlen die Streuung beseitigt, also ein Bild von einwandfreier Schärfe erreicht; denn langwellige Strahlen werden nach bekannten Gesetzen in einem trüben Medium viel weniger gestreut als kurzwellige. So kann ein merkbar günstiger Effekt bereits mit Hilfe seines Gelbfilters erreicht werden. Natürlich muß dann die Schicht in bekannter Weise für Gelb sensibilisiert sein, also eine orthochromatische Emulsion Verwendung finden. Eine noch günstigere Wirkung ergibt sich bei Belichtung durch einen Rot$lter hindurch bei Verwendung einer rotempfindlichen (panchromatischen) Emulsion.According to the invention, the fact that the photosensitive Emulsion is significantly more permeable to long-wave light than to short-wave light; z. B. according to the measurements of B. M. R ae and C. T o 1 m a n is the permeability for red five times as large as for blue, see Photographische Industrie, 193o, no. 53. Accordingly, the exposure will not be in any light, such as the one. Lightbulb o. The like., Made, but with an upstream filter that is only long-wave Lets rays through. These rays penetrate deeper into the light-sensitive Layer. In addition, by eliminating the blue rays, the scattering is eliminated, thus an image of perfect sharpness is achieved; because long wave rays will be according to known laws in a turbid medium much less scattered than short-wave. A noticeably beneficial effect can be achieved with the help of its yellow filter will. Of course, the layer must then be sensitized to yellow in a known manner be, So find an orthochromatic emulsion use. An even more beneficial effect results from exposure through a red elder when using a red sensitive one (panchromatic) emulsion.
Die beste Wirkung wird beim Arbeiten mit den äußersten roten und infraroten Strahlen erreicht. Durch eine Reihe von sensibilisierenden Farbstoffen, die seit einiger Zeit zur Verfügung stehen, ist es möglich, eine photographische Emulsion auch für dieses Spektralgebiet empfindlich zu. machen.The best effect will be when working with the extreme red and infrared Rays reached. Due to a number of sensitizing dyes that have been around since Some time available, it is possible to use a photographic emulsion also sensitive to this spectral region. do.
Claims (1)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG79726D DE600568C (en) | 1931-05-15 | 1931-05-16 | Process for the production of printing forms by means of a wash-out relief produced by photographic means |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEG0079726 | 1931-05-15 | ||
DEG79726D DE600568C (en) | 1931-05-15 | 1931-05-16 | Process for the production of printing forms by means of a wash-out relief produced by photographic means |
Publications (1)
Publication Number | Publication Date |
---|---|
DE600568C true DE600568C (en) | 1934-07-25 |
Family
ID=25979106
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DEG79726D Expired DE600568C (en) | 1931-05-15 | 1931-05-16 | Process for the production of printing forms by means of a wash-out relief produced by photographic means |
Country Status (1)
Country | Link |
---|---|
DE (1) | DE600568C (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE746623C (en) * | 1938-06-25 | 1944-08-16 | Emil Baer | Process for making screened colloid relief printing forms |
-
1931
- 1931-05-16 DE DEG79726D patent/DE600568C/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE746623C (en) * | 1938-06-25 | 1944-08-16 | Emil Baer | Process for making screened colloid relief printing forms |
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