• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Invention m. used in systems in which rasters are used for separate two-sided images, the angular displacement and the lineatures of which differ from one another. To improve print quality, the first raster is placed under any of the angles lying in the range of 19-24 & to the second, the second - in the range of 25-29 to the third and the third in the range of 32-36 to the fourth. In the raster system, raster deviation of ± 12% from the average lineature of the device is allowed. The field of tolerances of angles of rotation 1-2. A raster of individual rasters hitting one another is independent of the color game. The combination of raster lines can be partially transformed one into the other by multiplying the periods of the rasters by a constant factor. Specific values of lineatures and raster angles for three- and four-color printing are given. ZP f-ly, 4il., 4 tab. § W c
    公开号:SU1412603A3
    申请号:SU823511952
    申请日:1982-11-12
    公开日:1988-07-23
    发明作者:Шоппмейер Йоханнес
    申请人:Др.-Инж.Рудольф Хелль Гмбх (Фирма)；
    IPC主号:
    专利说明:

    four
    ka
    about: about 00
     s
    The invention relates to a raster system for multi-color printing5 in which rasters, respectively, are used for individual color separation images, the angular displacement and the lengths of which differ FRIEND from the other.
    The purpose of the invention is to improve the quality of printing by using a raster system for multi-color printing, which is insensitive to the shift of rasters.
    FIG. 1a and b show the rosette structure with traditional rasters (prior art); figa and b - rosette structures for electronic screening (prior art); in fig. Za and b - rosette structure in raster system according to the invention; Fig. 4 shows a comparative diagram for the dependence of the resulting axis as a result of the color play of the color distance on the degree of surface coverage for different raster systems.
    The essence of the invention is that for the manufacture of printing forms for multi-color printing it is proposed to use the ranges of angular displacements of rasters relative to each other in accordance with the periods of these rasters shown in Table. one,
    In tab. 1 shows the individual raster systems, where the values of d
    and d.
    respectively raster periods.
    which should be understood as inverse values with respect to raster lineature in lines per centimeter (line / cm), and d and dj are the angular displacements of rasters relative to each other, with indices 1, 2 and 3 respectively corresponding to one of three printed rasters in three-color printing, in which printing is performed using the colors magenta, cyan and yellow.
    Values of parameters of raster structures presented in table. 1 are values with which particularly good results are achieved.
    According to the table. 1 shows that it is most advisable to use the lo
    blowing angle ranges: d, 19-24
    d 25-29 and dj 32-3o °.
    I agree on the use of a technical solution that a combination of lineature systems in systems can
    0
    5 0 5
    about
    five
    , g
    five
    partially translate one into another by multiplying the periods of the rasters by a constant coefficient, which is an advantage in that the combination can be converted into the desired lineature of the raster. The following is an example of such a conversion that showed good results in practice: d 0.145 mm, dj 0.125 mm, dj 0.150 mm, 23.5 ° and d J 23.
    The line patterns of rasters established by this are, at first, substantially thinner than the lineature range required in practice, by 60 lines / cm. The raster periods are therefore recalculated by multiplying by a constant factor into the desired range. This almost corresponds to an increase in the raster system with a camera. Due to the recalculation, the following partial 8 variants are obtained.
    Option 1, The largest raster lineature 60 lines / cm, coefficient
    1 44 I 5 J.
    Q, i 0.193 mm 51 ,,. 7 lines / cm;
    d „0.166 60.0 lines / cm;
    dj 0,200 mm 50JO lines / cm.
    Option 2, Medium raster lineature 60 lines / cm, coefficient 1.15:
    dj 0.166 mm - 60.0 lines / CMj
    dg - 0, 144 mm 69.4 lines / cm;
    dj 0.172 mm 58.0 lines / cm.
    Option 3, The smallest raster lineature is 54 lines / cm, the coefficient is 1.234568:
    d (0.179 mm 55J9 lines / cm;
    dj 0.154 micron 64.8 lines / cm;
    d. 0.185 mm 54.0 lines / cm.
    The best result is given by option 3, since it allows to obtain the best properties for good printability and a good image of details, if the thinnest raster is used for printing in black.
    In Table 2, the angular positions of the rasters relative to the angle 0 are given (the raster system for three-color
    print) i
    In practice, a large amount of work with four-color printing, i.e. In addition to the three printing colors — magenta, cyan, and yellow — printing is performed in black, according to which the color reduction (UCR) is applied to the three other print colors. Since the color of the print, which is transmitted in print with minimal contrast, i.e. as a rule, yellow color, less likely to form moire, i.e. its moire is minimally visible, it is recommended to choose yellow as the fourth print color and include it in the already proposed raster system. In the present case, the raster parameters for the fourth color are provided, given in Table. 3
    As the best option for implementing the software, option 3 ,. as with this combination due to the fourth color, i.e. the yellow raster, the visible moire is not created, in accordance with which the combination given in Table 4 is obtained as the best raster system for four-color printing. four.
    The ratio of color rasters naturally may also vary depending on the considerations associated with the original. This is often used, for example, at the traditional angular offset with print colors of cyan magenta and black.
    All raster systems proposed according to the invention have the advantage that they are relatively insensitive to angular displacement, which was not the case in all other rasters. In the present invention, deviations from the specified angular position by 1-2 and from the raster period on i O can be allowed 020-0.030 mm (respectively, in a more general form approximately ± 15%) without this leading to the formation of moire and visible fine structure, which is explained in more detail later.
    A feature of the known raster systems was the fact that the so-called rosette patterns appear during the final printing. FIG. Figures 1a and b show such fine structures, arising, for example, with conventional rasterization in accordance with DIN 16 547. FIG. 1a shows sockets without center points, and FIG. 16 - with the central points, and the size, respectively the diameter, of the resulting dotted pattern depends on the screen frequency. In practice, it turned out that it is still bearable, but a noticeable thin structure is obtained already with raster linature of about 60 lines / cm. More coarse rasters lead to an already unacceptable fine structure, as is also the case with the raster in the Schmitt dissertation.
    FIG. 2a and b also show the resulting dotted patterns of fine
    0 structures for electronic screening according to known methods. In addition, in FIG. 26 into the black raster is shifted half the diagonal of the raster cell. FIG. 1a and b,
    5, respectively, 2a and b, the used angles of the raster are depicted as thin strokes. As follows from FIG. 1a and b, respectively 2a and 26, after printing in these thin structures, various conditions can be met
    raster points of individual rasters. This is the cause of color current fluctuations, which are also referred to as color play. In practice, you were
    5 that as traditional raster systems of FIG. 1a and b, as well as the electronic screening systems of FIG. 2a and b have a noticeable color play, since the overlapping surfaces in individual partial colors change locally when printed by overlay and are periodically repeated in accordance with the fine structure.
    At the same time, in FIG. It’s obvious that, according to the invented invention, it is possible with the above raster structures to achieve significantly more favorable conditions regarding the color game. Comparison
    0 of the drawings shows that in the case of raster systems according to the invention, the thin structure has a much lower regularity. This simultaneously means jto getting each on
    The other 5 raster points of individual rasters have more subtle structures that are more significant due to the case, and thus are independent of the color play, since the residual effect is far below the perception of the human eye.
    FIG. 4 shows a graphic image that shows the comparison of the color distance resulting from a possible color play depending on the degree of surface coverage for a traditional raster system K according to
    0
    above the standard, the CIN, the electronic raster system E and the raster system according to the invention. The fluctuation of the color current can be created, for example, by displacing a black raster half the diagonal of the raster cell. As can be seen, the raster system according to the invention provides, in the range of surface coverage from 5 to 95%, a significantly smaller color distance.
    It should also be mentioned that the raster systems of the present invention can be used in practice in a variety of forms, be it in the form of so-called copy or contact rasters in the manufacture of printing plates for various printing technologies, in the form of electronic screening in the electronic production of color-separated images or in any other form in which such raster systems can be used to reproduce color images.
    Formula of Invention
    权利要求:
    Claims (4)
    [1]
    1. A raster system for multi-color printing, in which rasters are used for individual color separation images, the rotation of which is different for different color separation images, characterized in that, in order to increase the quality of
    chati, the first raster is placed under any angle from the angles lying in the range of 19-24 to the second, the second - from any of the angles lying in the range of 25-29 ° to the third, and the third - from any of the angles lying in 32-36 to the fourth, while the tolerance angle of the angles of rotation is 1-2, and the deviation of the rasters lies in the range of ± 12% of the system's average ruling.
    [2]
    2. A system up to claim 1, characterized in that for a three-color printing, a raster of the same color is chosen with a lineature of 54 lines / cm and an angle
    8, for the second color, a raster is selected with a lineature of 55, 56 lines / cm and an angular displacement of 51.5 and a third raster is selected with a lineature of 64, 52 lines / cm and an angular displacement of 75, the angles being measured relative to the direction O,
    [3]
    3. System pop. 1, characterized in that one raster s is selected for four-color printing, or -. with a diameter of 54.05 lines / cm and an angle of 8, another with a lineature of 55, 56 lines / cm and an angle of 5155 °, the third raster is with a lineature of 64, 52 lines / cm and an angle of 75,
    the angles are measured relative to the 0 ° direction,
    [4]
    4. The system in one of the paragraphs. 1-3, characterized in that the following raster systems are obtained by recalculating the lineatures of rasters by a slope factor.
    Table 1
    Raster period, nm

    0.125 0.155 0.126 0.125 0.130
    0.170 0.165 0.175 0.150 0.150
    T
    Color Period Liniatu raster, ra rast mm ra, line / cm
    The first 0.185 54.05 The second 0.180 55.56 The third 0.155 64.52
    Ta
    Color Raster Period, mm
    First yellow 0,155
    Second yellow 0.155
    Third yellow 0.175
    Continuation of table 1
    Angle mixing, deg.
    Nii.V

    34-35 20-24 32-35 22-25 25-29
    T a b faces 4
    Cyanogen
    0.18554.05
    but
    FIG. one
    5, 5
    four
    Q.fc
    About 5 0
    Ъ 30 W 50 60 70 80 90 95 100% Coverage rate, Ps
    0L / 2
    Editor E. Papp
    Compiled by A. Dobrydnev
    Tehred M. Khodanich, Proofreader S. Shekmar
    Order 3677/59
    Circulation 442
    VNIIPI USSR State Committee
    for inventions and discoveries 13035, Moscow, Zh-35, Rauyuka nab. 4/5
    Subscription
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    引用文献:
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    US3085878A|1958-09-29|1963-04-16|Rochester Inst Tech|Half-tone screen for color separation|
    DE2012728C3|1970-03-18|1974-09-19|Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel|Process for the electro-optical recording of screened halftone images|
    DE2827596C2|1978-06-23|1984-11-22|Dr.-Ing. Rudolf Hell Gmbh, 2300 Kiel|Method and arrangement for the production of screened printing forms|
    JPS6128202Y2|1979-08-21|1986-08-21|JPH0515103B2|1983-11-24|1993-02-26|Ricoh Kk|
    AT381401B|1984-06-04|1986-10-10|Weidinger Wolfgang|METHOD FOR THE PRODUCTION OF SCREEN COLOR EXTENSIONS AND THE FURTHER PROCESSING THEREOF IN A FLEXO PRINTING FORM|
    JPH0734110B2|1985-07-12|1995-04-12|富士写真フイルム株式会社|Image density changing method in simple color proof|
    JPH0691620B2|1988-11-15|1994-11-14|大日本スクリーン製造株式会社|Method for recording halftone image of color image|
    DE4011689C2|1990-04-06|1992-11-19|H. Berthold Ag, 1000 Berlin, De|
    US5155599A|1991-07-25|1992-10-13|Miles, Inc.|Screening system and method for color reproduction in offset printing|
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    法律状态:
    优先权:
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