US1645112A - Process of photographic copying by the reflection method - Google Patents

Process of photographic copying by the reflection method Download PDF

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Publication number
US1645112A
US1645112A US97757A US9775726A US1645112A US 1645112 A US1645112 A US 1645112A US 97757 A US97757 A US 97757A US 9775726 A US9775726 A US 9775726A US 1645112 A US1645112 A US 1645112A
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Prior art keywords
layer
colloid
reflection method
exposure
picture
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Expired - Lifetime
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US97757A
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English (en)
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Miller Alfred
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IG Farbenindustrie AG
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IG Farbenindustrie AG
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    • 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
    • G03F1/00—Originals for photomechanical production of textured or patterned surfaces, e.g., masks, photo-masks, reticles; Mask blanks or pellicles therefor; Containers specially adapted therefor; Preparation thereof

Definitions

  • Patented oct. 11, 1921 Patented oct. 11, 1921.
  • PROCESS OI PEOTOQRAPHIC COPYING BY THE REFLECTION METHOD.
  • t e method according to the invention to vary the thickness of t e layer within wide limits, from 0.001 mm. up to 0.1 mm, or more, since for producing the picture there are utilized only the alterations which occur on the surface of the layer. Moreover, the limits within which the ex osure may be varied, particularly when t icker layers are used, are
  • thev new process is within practical limits independent of the thickness of the layer, since only the surinto consideration face of the layer comes for the formation of the picture, and the exposure of the parts of the layer which adjoin the support are without influence on the copy or printing form obtained.
  • the general principle of the present invention may be determined as'follows: Copying by the reflection method without caring for possible fogging, neither by sitive layer nor byother measures, and restricting the after treatment by which the picture is built up merely to the surface of the layer. It is obvious that this general principle may be applied to all light sensitive layers whether they be sensitized by silver halides, chromium salts, iron salts or other sensitizers, Whenever it is possible to strictly limit the after treatment to the surface of the layer and to exclude the lowleir t e picture. Since this is really feasible the principle is ca able of various applications, as will hereina ter appear.
  • the recess according to the invention it is possi le to produce-a printing surface directly by exposure by reflection.
  • This may, for example,be carriedout in the following manner: A plate or film of transparent material, preferably dyed in order that it may also serve as a light filter, is coated with a colloid layeiywhich is then sensitized by means of a solution of bichromate, which may'contain in addition a catalyst, such as a salt of manganese or ofcopper, and is finally dried. It is then placed in the printing frame with the original to be copied, the colloid layer being adjacent to the original, which may be for instance a black drawing on a white ground, and the exposure is made'from the back through the support.
  • the bichromatized colloid acquires a selective faculty for retaining pigments brought thereon.
  • Pigments may be distributed over the surface of the colloid in the form of a fine powder; preferably the said powder may be dispersed in a fatty medium so as to form a fatty ink well known in the printing art.
  • prints may be made with a fatty ink from the fiat printing surface so obtained, whereb a right handed picture is produced in white upon a black ground i. e., the right hand side of the object to be represented corresponds to the right hand side of the picture.
  • non-curling layer When using films, it is advantageous to apply a so-called non-curling layer to the back of the film in order to equalize the strains which the sensitive layers exert on the support, particularly when the sensitive layer is relatively thick.
  • These non-curling layers have not been used in the known processes, because the treatment of the exposed layer necessitated the immerslon of the whole picture in the bath, and the non- I is very essential when a negative is concerned.
  • a print may be made on zinc from the printing surface and may be reversed in known manner and printed in an offset printed machine.”
  • a print may also be madefrom the printing surface on, a photolithographic transfer paper and this may be transferred on to zinc, again reversed in known manner, and. prints maybe taken directly from the zinc.
  • the printing surface may also be used as 'a negative, for-which purpose it is soaked 111 water after having been inked with a fatty ink, after which it is dried, and may advantageousl be sprinkled with. bronzepowder in or er to strengthen the covering power. It may then be provided with a very thin coating of lacquer and in this condition may be retouched as desired.
  • Negatives may also be made in the manner of photolithographic copying by aid of fatty ink.
  • the sensitive layer consisting of a colloid adapted to swellis inked with a fatty ink after exposure, and is developed, by washing.
  • the procedure also ma follow that ofalbumenprinting on zin lay using a colloid layer which is soluble in water.
  • an agent which promocties development such as lactic acid, acetic aci Copies may also be made by spraying a hygroscopic colloid layer with fine powder after the layer has been exposed by the reflection method and breathed upon or similarly treated.
  • Figs. 1 and 2 of the accompanying drawings represent sections on an enlarged scale through films embod ing the present invention.
  • 1 is a supp rt of celluloid or other suitable material
  • an 2 is a layer of a colloid sensitized to light by biin a fatty medium, retained at the areas affected by light. during exposure, 1 and 2 being the support and the sensitized colloid, respectively.
  • a selective deposition of particles of any metal or metal compound from a supersaturated solution thereof must take place.
  • Such a selective deposition is known as physical development; it also occurs when the picture developed chemically is intensified by a physical method.
  • a process for producing copies by the reflection method wherein the treatment of the sensitized colloid layer after exposure for the purpose of building up the picture is restricted to the surface of said layer.
  • Aprocess for producing copies by the reflection method which consists in treating after exposure the sensitized colloid layer carried on a transparent support in such a manner that the photochemical alterations solely in the surface of said layer are utilized for building up the picture.
  • a process for producing copies by the reflection method which consists in treating after exposure the sensitized colloid layer carried on a transparent flexible support. in such a manner that the photochemical alterations solely in the surface of said layer are utilized for building up the picture.
  • a process for producin copies by the reflection method which consists in treating after exposure the sensitized colloid layer, carried on a transparent flexible support provided on the back with a colloid layer, in such a manner that the photochemical alterations solely in the surface of the first mentioned layer are utilized for building up the picture.
  • a process for producing copies by the reflection method according to claim 4 which consists in treating after exposure the sensireflection method according to claim-4.- which comprises moistening the surface of the sensitized colloid layer and distributing thereon a fine pigment.
  • A. process for producing copies by the I reflection method according to claim 4 which consists in distributing over the surface of the sensitized colloid layer pigment dispersed in a fatty medium and developing the colloid layer with water.
  • said colloid layer after having been exposed being inked with a fine pigment dispersed in a fatty medium and spread with a pigment.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Plates And Materials Therefor (AREA)
US97757A 1924-11-14 1926-03-26 Process of photographic copying by the reflection method Expired - Lifetime US1645112A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE1645112X 1924-11-14

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US1645112A true US1645112A (en) 1927-10-11

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US (1) US1645112A (fr)
FR (1) FR649758A (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2852373A (en) * 1956-03-12 1958-09-16 Mabel Stewart Reproducing engineering data

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2852373A (en) * 1956-03-12 1958-09-16 Mabel Stewart Reproducing engineering data

Also Published As

Publication number Publication date
FR649758A (fr) 1928-12-27

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