SU682160A3 - Method of making colour-separation arrays for reproducing colour images - Google Patents

Description

The purpose of the invention is to simplify the manufacture of dies while improving product quality.

This is achieved by placing the rasters at a certain angle to one another and the image is directly recorded in the form of raster elements, while matching one raster with the other is in an angle of 12 to 45 °. The positive effect of this invention is that the third step disappears. a known method: the copying process using contact rasters, as a result of which it is possible to produce color-separating matrices more quickly and more simply. As a result of the loss of the copying process, there is also an improvement in the quality, since the process of film development, as well as inaccuracies in overlapping one contact over the other and the color separation image, disappear. In addition, the entire process of making color separation matrices is automatically disintegrated on one machine without any manual operations that take time.

FIG. 1 shows rasters of color separation matrices located in combination with one another; in fig. 2 - an example of writing of elements of a raster; in fig. 3 shows a device for implementing the proposed method for making color separation matrices.

FIG. Figure 1 shows a planar detail with four twisted one against the other, raster grids of color-separation matrices superimposed one upon the other, which are respectively formed from lines 1,2; 3.4; 5.6 and 7.8. The cell of the grids in which the raster point lies is indicated by a dash-dotted line. The raster size and, together with this, the size of the cells of the individual grids are calculated and the coagulation angles are chosen so that a square parcel is formed, formed by the corner points 9, 10, 11 and 12. For multi-color printing, usually one is taken. from raster grids of color-separation matrices, it is preferable to choose & yellow for color with an orthogonally oriented structure; here, the grid 13 is formed from lines 1 and 2, and also forms the sides of a parcel consisting of three by three, therefore, of nine cells.

At an angle of 45 ° to the orthogonal axes, this grid is marked by raster grid 14 with lines 3 and 4.

The grid 15 formed from lvd 5 and 6 is inclined at an angle of 18.3. The lines of this raster are indicated by xxx. The grid 16 is formed from lines 7 and 8.

FIG. 2 shows in an enlarged size an example of a raster element from lines 5 and 6, which may lie, for example, in fields x 17-19. This raster element consists of two parts of which one lies in field 17, the other in field 18 of the parcel. The raster element is constructed using the recording beam 20, represented in the left corner of FIG. 2 in the form of a circle, from horizontally superimposed one dashed recording lines. Field 17 consists of one-over-one recording lines, respectively, consisting of twelve units of point diameters, i.e. together six or six point units,

A portion of the square spot 21 relates to field 17. By means of an exposure beam, this partial spot should be recorded as precisely as possible. It should be noted that the said hatching process should occur automatically and only the illumination control of the writing light point occurs as a result of accumulated data. The first four recording lines remain dark during the recording of all their twelve time units. The five lines of record consist of six light, one dark, five light. The sixth line consists of four light, four dark, four light; The seventh line - from two light, six dark, four light and the last eighth line of recording - from one light, eight dark, three light. All this data is accumulated before recording begins, which is described in more detail in FIG. 3

A raster element in the field 18 adjoins the raster element on the field 17. The raster element 18 contains a residual part of the spot overlap. Since both partial segments go one after the other without a seam, the patch becomes full.

Oblique edges 22 and 23 spots 21 undergo when recording distortions that become noticeable and are presented as wavy lines on the sides of the spot. But these inaccuracies are so insignificant that they cannot be detected with the naked eye and therefore harmless.

FIG. 3 shows a device for carrying out the proposed method.

The device comprises a drive motor 24, an axis 25 and drums 26 and 27 offset with the same and constant rotation. The original image 28 is fixed on the drum 26, and the film 29 is light-sensitive on the drum 27.

The optical system of the deployed device 30 decomposes the original image 28 in the area of the image 31 and supplies electrical voltages to the line 32, the magnitude of which corresponds to the tone density of the original in the image area 31. After passing through several electronic units, the principle of which will still be understood in the form of control data, the cathode ray tube 33 is reached and the brightness of the light spot formed by the electron beam on the screen of the cathode ray tube is controlled. Instead of a cathode ray tube, another light source can be used, for example a laser, a xenon lamp or other sources of illumination of a corresponding intensity. The light spot with the help of optics 34 is projected onto the photosensitive film 29 and, in accordance with the control data, it records in the area 35 a reproduction of the original in the form of raster elements, as shown in FIG. one.

After each turn of the drum, the width of the column is drawn. This stretch is necessary so that during the reproduction of the original image, the entire surface of the image is decomposed and recorded accordingly.

The voltages supplied via line 32 are connected to an analog-to-digital converter 36, to which 37 clocks are continuously sent from the generator through the line 38 to clocks. The frequency of the clock cycles is such that, with the available peripheral speed, the drum clock intervals correspond to the size of the raster elements and, accordingly, a multiple of the recording lines. values of this gradation as binary coded numbers through the bundle of wires 39 to the register of 40 addresses. This number is the starting address of the space in the storage device that contains data for recording the corresponding raster elements that make up the parcel with the set gradations. The data of individual raster elements of the parcel can be addressed in the storage device as follows.

The number of tonal gradations caused, as already mentioned, is registered as a binary number in the 40 address register. This register through lines 41 and 42 is additionally connected to ring counters 43 and 44. The totalizer in the address register sums the numbers suggested through lines 41 and 42 into the accumulated number of gradations. The counter 43 sequentially counts the elements of the raster fields 17-19 of the first column and gives, through the line 41 - the values 0.1 and 2 to the register of 40 addresses. After the transition to the zero position, it begins — with recording the first raster element of the field 17 of the same parcel column, following in the recording direction. The process proceeds accordingly, until the entire line of the image is recorded. It consists of identical columns of all the parcels located one after the other in the direction of the record.

five

The counter 44 is in the zero position during the recording of the entire line of the image formed from the first columns. Before you start recording the next line, the image

0: and, respectively, before the start of the next revolution of the drum on the decomposition and recording side, the width of the image line and, accordingly, the width of the column occurs. The pulse is produced with a pulse, which, through line 42, sequentially turns on the counter 44 t columns one unit on line 45. This unit is a number that corresponds to the difference of the addresses of the data group loading one column of the parcel. The second line of the image follows, while now all the second columns are recorded in sequence.

5 until after further switching on of the counter 44, before the beginning of the third line of the image, the third columns will not be recorded. The process accordingly goes further until

0 reproduction will not be completed. As already mentioned, a separate raster element is recorded, in which the image signals call the start address of the memory area containing the parcel recording data to which the raster element belongs. The starting address is recalled through the bundle of wires 39. The counters 43 and 44 increase this starting address in the register of 40 addresses to the extent that the data of the raster element is called and recorded with the correct position inside the parcel. Through the tact at the entrance of the counter 43, the frequency of which is in accordance

5 with a finer division of the scale above, it is achieved that, when recording one column, these recording lines control the electron beam, which correspond to a given position inside

0 parcels.

Since the raster element, for example, according to FIG. 2 consists of eight recording lines, respectively, the frequency of horizontal deviation of the electric beam is calculated. The horizontal deflection is performed through the deflection amplifier 46 and through the line 47. One clock is eight times higher than the recording clock frequency, which comes from through the line 48, synchronizes the deflection amplifier 46. During the deflection, i.e. during the recording of the horizontal recording line, the emission velocity is constant. The time of the reverse transition relative to the recording time is small. In the vertical direction, in the drum instruments it is not necessary to deflect the beam, since as a result of the rotation of the drum, a relative vertical movement is achieved. All electronic lighting devices, in which the invention can also be applied, additionally require vertical control of the electron beam, because the carrier does not move during recording. During the horizontal deflection, the intensity of the electron beam is manipulated. The voltage for this manipulation is supplied by a register 49. The line 50 is used to coordinate with the sensor of clock pulses. If a recording line consists of twelve point units, then one clock cycle must be brought to the register, which is twelve times higher than the clock on line 48. In practice, the clock frequency on line 50 is even higher, for example, 14 times, so completely neglect the return time after the horizontal scan. Register 49 is a so-called shift register and acts as an intermediate accumulator between data accumulator 51 and recording tube 33. The shift register 49 contains additional electronics that provide the accumulated data for controlling the electron beam illumination according to the following program. By inverting the interleaving of data for horizontal recording lines or inverting a sequence of recording lines or by inverting both, it is achieved that all four mirror-symmetrical images of the raster element can be represented. This makes it possible to significantly reduce the amount of memory. It should also be mentioned that it is possible to easily change the scale between the copy and the original by changing the drum diameter. To avoid image distortion, however, the horizontal movement of the draw on the recording side is controlled so that the aspect ratio of the image is maintained. Form 1 of the invention. A method for manufacturing color separation matrices for reproducing color images, based on expanding the original image, color separation and image acquisition on the film as raster elements, and combining rasters of individual colors, in order to simplify the production of matrices while improving the quality of reproduction, rasters are located relative to each other at an angle from If 45. Sources of information taken into account in the examination 1. The patent of Germany 1193534, cl. 21 a 32/04, 1950 (prototype).

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