SU22675A1 - Method of making metal embossed printing plates or embossed photographs - Google Patents

Description

The proposed method of making megalonic embossed photographs is that the image on transparent paper is laid down onto the upper surface of a selenium plate connected to the negative pole of the current source and containing a metal grid in the middle. , To the bottom surface of the selenium plate are soldered thin vertical insulated wires, forming with their ends the surface of an electrode dipped into the electrolyte. The electric current, in accordance with changes in the conductivity of the selenium plate, is transmitted through the designated vertical wires to the surface of the electrode. Galvanic deposition of metal on the electrode should occur in full accordance with the copied pattern. The resulting relief is further processed by conventional techniques to obtain a cliché or embossed photograph.

The attached drawing schematically shows the device, according to the proposed method.

Pure metallic selenium (Se) is cast in the form of a thin plate 2 of the same size as the size intended for copying photographs or drawings. In the thickness of plate 2, along the middle line of its thickness, very often silver is poured onto a or platinum (or other metal that is well conductive of electricity) grid 5. The ends of the wires of the grid come out of two opposite ends of the plate freely and are collected from each side (twisted) one wire. Both wires are then connected to one common wire 9, which can be connected to a current source 7. In this case, the size of the metal grid must exactly match the size of selenium

records

On the lower side of the selenium plate, the other plate 4 of the same size 4 as the first one, but much thicker and consisting of very thin silver straight wires of the same length, isolated from another thin layer of ordinary insulators applied to each wire separately. The thinnest straight wires, spaced tightly to one another, are arranged parallel to one another and perpendicular to the selenium plate. Both plates are thus one piece. The upper part of this double plate is a free, flat surface of metallic selenium. The lower part is the flat surface of the ends of the vertically standing silver arms: lok, insulated with themselves. These vertically standing silver wires do not touch c. metal mesh flooded

in the thickness of the selenium plate, being soldered only in the thickness of the selenium plate, which lies below the metal grid.

Photograph, drawing or drawing 6 should be made on a flat transparent surface (glass, celluloid, etc.) with light impermeable paint. For ease of drawing, this transparent surface may be coated with a translucent layer of varnish, emulsion, etc. The drawing, drawing, or photograph must be in a positive image.

A transparent plate with a pattern printed on it is superimposed on the selenium plate 2 by a pattern downwards. The entire electrode is lowered into the electroplating bath /, immersing in it only the ends of the silver wires to level 5. The wire coming from the silver grid of the selenium plate is connected with the plus (-) current source. A transparent plate with a pattern applied to it is illuminated from above by a light source 7. Under these conditions, the usual process of depositing metal on the (-) electrode occurs. At the same time, those parts of the transparent plate with a pattern that are not covered with opaque paint transmit light to the selenium plate. Those places of the selenium plate on which the light falls, become conductive to electricity, but those where there is no light remain non-conductor of current. The vertical rows of thin silver wires, the lower part immersed in a bath, and the upper adjacent to the selenium plate, are charged with current only in those places where they adjoin the conductive places of the selenium plate.

During electrolysis, the metal layer 5 (copper, silver, nickel, etc.) is deposited in this way on the electrode 4 in exact accordance with the pattern deposited on the transparent plate. When the metal layer on the electrode 4 reaches a sufficient thickness, the transparent plate is removed from the selenium plate and the entire surface of the latter is exposed to light for some time. In this case, the deposition of metal on the surface of the electrode 4 also occurs in those places where it has not been deposited before. Along with this, of course, metal deposition also occurs in those parts where it was deposited earlier.

At the end of the electrolysis, the resulting metal relief is removed from the electrode and further processed using conventional techniques to obtain a cliché or embossed photograph.

The subject matter of the invention.

A method of making metal embossed printing plates or embossed photographs from transparencies or transparent drawings or drawings by electroforming and using a selenium plate, characterized in that the transparent original is laid down on the upper surface of the selenium plate, in the middle of which is embedded a metal mesh connected with a negative the pole of the current source, and thin, vertical, parallel insulated wires are soldered to the bottom surface of the selenium plate; With its ends, the surface of the electrode lowered into the electrolyte, on which the metal particles are deposited by the action of electric current when the original is illuminated, which deposition takes place until the required relief height is obtained, and then the original is removed and the lighting is removed for some time the areas of the electrode to form the base of the relief in the form of a solid metal plate, which is then removed from the electrode and processed further by conventional methods to obtain a cliche or elefnoy photos.