US2768577A - Multi-color-separation printing plates - Google Patents

Multi-color-separation printing plates Download PDF

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Publication number
US2768577A
US2768577A US34595353A US2768577A US 2768577 A US2768577 A US 2768577A US 34595353 A US34595353 A US 34595353A US 2768577 A US2768577 A US 2768577A
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plates
color
plate
deformations
screen
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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
    • G03F5/00—Screening processes; Screens therefor
    • G03F5/22—Screening processes; Screens therefor combining several screens; Elimination of moiré

Definitions

  • one solution of the problem described has involved the exposure of each of the color-separation plates to light reflected from a specially prepared black-and-white separation plate with a conventional photoengravers screen interposed to produce the desired screen effect in the image.
  • the screens are rotated through different angles relative to a horizontal base line for the several exposures so that the lines of the screen-patterns fall at different angles relative to such a base line.
  • a group of color-separation plates so formed is capable of printing a color reproduction with a minimum of the objectionable moire patterns described.
  • a correlated set of three or more screen-pattern colorseparation printing plates each comprising a regular pattern of elementary deformations, the centers of adjacent deformations of each of the plates lying at the apices of a series of parallelograms with the sides of the parallelograms of diflferent ones of a plurality of the plates forming different corresponding angles therebetween, thereby substantially to reduce moire patterns in a resulting multicolor reproduction.
  • adjacent deformations is used herein and in the appended claims to refer to deformations which are adjacent along a given line of the screen pattern or to nearest deformations lying on adjacent lines of such pattern.
  • Figs. la-ld, inclusive are idealized representations of individual screen-pattern color-separation plates formed with conventional photoengravers screens oriented at different angles for different colors;
  • Figs. 2a2d, inclusive are idealized representations of individual screen-pattern color-separation plates engraved by apparatus of the type described in said Patent No. 2,575,546 and embodying the present invention
  • Figs. 3a3d, inclusive are fragmentary details of printing plates of the type represented in Figs. 2a2d, inclusive, respectively, illustrating the preferred form of the individual engraved impressions; while Figs. 4a and 4b are similar representations of a modificd form of color-separation plates suitable for use in place of those represented by Figs. 2b and 2d, respectively.
  • Figs. 1a1d there are represented in idealized form color-separation plates produced by conventional photoengraving methods with the engravers screens rotated at different angles for the different colors.
  • Fig. la may represent the black-and-white plate
  • Fig. 1b the yellow plate
  • Fig. 10 the blue plate
  • Fig. 1d the red plate.
  • the engraved deformations are shown as square and of minimum depth and area, which would represent in the black-and-white the darkest shade value and in the other plates maximum color saturation, although it will be understood that the configuration of the deformations will depend on the shape of the engraving stylus and its orientation relative to the direction of scanning.
  • the centers of adjacent deformations lie at the apices of a series of parallelograrns, specifically squares, with the sides thereof both making an angle of 45 to a horizontal reference base line.
  • the screen pattern is similar but the sides of the series of squares are parallel to and at to the horizontal base line.
  • the sides of the squares of the screenpattern form angles of 75 and 165 to the horizontal base line, while in the plate of Fig. 1d the sides of the squares of the screen-pattern form angles of 15 and to the horizontal base line.
  • Figs. 2a-2d, inclusive of the drawings, there are illustrated a correlated set of screen-pat tern color-separation engraving plates embodying the present invention.
  • the plates of Figs. 2a-2d, inclusive are idealized to show rectangular engraving deformations of minimum depth.
  • Each of the plates of Figs. 2a2d, inclusive comprises a regular screen-pattern of elementary deformations, the centers of adjacent deformations of each of the plates lying at the apices of a series of parallelograms, such as the parallelograms 10, it) of Fig. 2a; 11, 11 of Fig. 2b; 12, 12 of Fig. 2c; and 13, 13 of Fig. 2d.
  • the parallelograms 10 the parallelograms 10
  • the parallelograms of the several plates form different corresponding angles therebetween, that is, the parallelograms may be said to be collapsed like a scissors rather than being bodily rotated as in the plates of Figs. la ld, inclusive.
  • the angle or between the sides of the parallelogram 1.0 is equal to in the plate of Fig. 2b, the angle a is equal to 75; in the plate of Fig. 2c, the angle a is equal to 90"; while in the plate of Fig. 2d, the angle at is equal to 105.
  • the separations of the centers of the deformations in a direction parallel to a reference base line that is, the horizontal width of the parallelograms varies progressively from plate-to-plate as sine 0C.
  • the separations of the centers of the deformations in a direction normal to the horizontal base line of each plate that is, the length of the vertical side of each parallelogram, are varied from plate-to-plate as l/sin on. With such a pattern, the resolutions of the several plates are equal, although in the plates of Figs. 2a, 2b, and 2d the horizontal and vertical resolutions are not precisely equal to each other.
  • the stator 4% may be rotated by one-half of the angular distance of one tooth and one space for each revolution of the rotor 49a; in forming the plate of Fig. 2b, it may be rotated one-quarter of such angular distance; in forming the plate of Fig. 2c, it may be held stationary; While in forming the plate of Fig. 2d, it may be rotated three-quarter of such angular distance per revolution of the rotor 46a, or one-quarter of such angular distance per revolution but in the reverse direction.
  • plates of Figs. 2a-2d, inclusive may be formed on a single engraving machine of the type described in aforesaid iatent 2,575,546 by making the adjustments described between the engraving of successive plates.
  • Figs. Za-Zd, inclusive may also represent a set of color-separation imprints, except that in this instance the dots represent printing islands" rather than depressions and the imprints represent highlight portions of a reproduced image, so that Figs. 2b, 2c, and 2d represent portions of the image of minimum color saturation. It is possible to form the color-separation plates of Figs. 2a- 2a', inclusive, by the conventional photoengraving method by interposing during the exposure of the several color-separation plates engravers screens of the same general configuration as the screen patterns shown in the figures. Further, as described above, plates for printing images as represented by Figs. 2a-2d, inclusive, may be readily formed by the photoelectric engraving apparatus of said Patent 2,575,546.
  • a multi-color image reproduction comprising the superimposition of a series of imprints, as represented by Figs. 2a-2d, inclusive, there may be made in any desired sequence first a black-and-white or brightness imprint, as represented by Fig. 2a, he ing screen pattern consisting of dots forming a series of parallelograrns 10. There is then superimposed upon the imprint of Fig. 2a the imprints representeds by Figs.
  • Figs. Bat-3d, inclusive, of the drawings there are represented idealized printing patterns formed by the use of pyramidal engraving stylus in the engraving machine adjusted to make color-separation plates having an orien on and separation between adjacent deformations corresponding to the patterns of Figs. 2a2d, respectively, and representing an image area of medium tone value or color saturation.
  • Figs. 311-311, inclusive the shaded areas 3.6-4.9, inclusive, respectively, represent the actual printing surface islands, while the intervening parallelograms with diagonals drawn in represent individual deformation: made by the pyramidal stylus in the engraving plate.
  • the printing patterns of Figs. 3a and 3c are formed by the use of a pyramidal stylus of square cross section while those of Figs. 3b and 3d are formed by the use of a pyramidal stylus whose cross section is a psralielogram.
  • the elemental printing surfaces of the plates of Figs. 3a-3d, inclusive have the same area and that there are the same number of surfaces per unit area of the image, but that the centers of adjacent deformations lie at the apices of a series of parallelograms with the sides of the parallelograms of different ones of the plates forming different corresponding angles therebetween, thereby substantially to reduce the moire patterns in a resulting multicolor reproduction, as described above.
  • Figs. 4a and 4b are represented screen-pattern colorseparation plates which may be substituted for certain of the plates of Figs. 2a-2d, inclusive, for example, those of Figs. 2b and 2d.
  • the deformations form a series of parallelograms 14 and 15, respectively, the sides of which form an angle of 60 to each other, but those of Fig. 4b being rotated through 90 relative to those of Fig. 4a.
  • the plate of Fig. 4a may readily be formed on the machine of Patent 2,575,546 in the same manner as the plates of any of Figs. 2a2d, inclusive.
  • the series of parallelograms formed by the deformations have different configurations relative to a horizontal base line and thus contribute to the elimination of intefering moire patterns in the same manner as the plates of Figs. 2a-2a', inclusive, described above.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of different ones of a plurality of said plates forming difierent corresponding angles therebetween, thereby substantially to reduce moire pat terns in a resulting multi-color reproduction.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of different ones of a plurality of said plates forming different corresponding angles a therebetween, the separations of said centers of said deformations in a direction parallel to a reference base line of each plate varying from plate to plate as sine thereby substantially to reduce moire patterns in a resulting multicolor reproduction.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of different ones of a plurality of said plates forming different corresponding angles a therebetween, the separations of said centers of said deformations in a direction parallel to a reference base line of each plate varying from plate to plate as sine a and the separations of said centers of said deformations in a direction normal to said base line of each plate varying from plate to plate as Us in a, thereby substantially to reduce moire patterns in a resulting multi-color reproduction.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of deformations of each plate lying in a series of parallel lines with said deformations of successive lines being progressively shifted from plate to plate in the direction of said lines, thereby substantially to reduce moire patterns in a resulting multi-color reproduction.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of different ones of a plurality of said plates forming difierent corresponding angles therebetween, each of said plates having substantially the same number of deformations per unit area, thereby substantially to reduce moire patterns in a resulting multicolor reproduction.
  • a correlated set of four screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of different ones of a plurality of said plates forming corresponding angles therebetween of 45, and thereby substantially to reduce moire patterns in a resulting multi-color reproduction.
  • a correlated set of three or more screen-pattern color-separation printing plates each comprising a homogeneous pattern of elementary deformations, the centers of adjacent deformations of each of said plates lying at the apices of a series of parallelograms with the sides of said parallelograms of diiferent ones of a plurality of said plates forming different corresponding angles a therebetween, the separations of said centers of said deformations in a direction normal to a reference base line of each plate varying from plate to plate as l/sin a, thereby substantially to reduce moire patterns in a resulting multi-color reproduction.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacture Or Reproduction Of Printing Formes (AREA)
US34595353 1953-03-31 1953-03-31 Multi-color-separation printing plates Expired - Lifetime US2768577A (en)

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US34595353 US2768577A (en) 1953-03-31 1953-03-31 Multi-color-separation printing plates
GB739665D GB739665A (cs) 1953-03-31 1954-03-22

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075042A (en) * 1959-12-23 1963-01-22 Fairchild Camera Instr Co Cold cutting technique for half-tone electronic engraving
US4286385A (en) * 1979-12-26 1981-09-01 Huck Joseph F Color screen indicator

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102007049238A1 (de) 2007-10-11 2009-04-16 Visumotion Gmbh Anordnung zur räumlichen Darstellung

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029103A (en) * 1930-01-31 1936-01-28 Howey Walter Photo-electric intaglio and relief engraving system
US2047851A (en) * 1932-06-25 1936-07-14 Joseph W Piercy Machine for reproducing printing plates from pictures
US2086798A (en) * 1932-06-22 1937-07-13 Greenberg Otto William Photoelectrical device for producing half-tone cuts
GB497194A (en) * 1937-01-05 1938-12-12 Ig Farbenindustrie Ag Process for influencing moire effects in photo-mechanical printing processes
US2238601A (en) * 1939-10-26 1941-04-15 Bell Telephone Labor Inc Telephotography

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2029103A (en) * 1930-01-31 1936-01-28 Howey Walter Photo-electric intaglio and relief engraving system
US2086798A (en) * 1932-06-22 1937-07-13 Greenberg Otto William Photoelectrical device for producing half-tone cuts
US2047851A (en) * 1932-06-25 1936-07-14 Joseph W Piercy Machine for reproducing printing plates from pictures
GB497194A (en) * 1937-01-05 1938-12-12 Ig Farbenindustrie Ag Process for influencing moire effects in photo-mechanical printing processes
US2238601A (en) * 1939-10-26 1941-04-15 Bell Telephone Labor Inc Telephotography

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3075042A (en) * 1959-12-23 1963-01-22 Fairchild Camera Instr Co Cold cutting technique for half-tone electronic engraving
US3209687A (en) * 1959-12-23 1965-10-05 Fairchild Camera Instr Co Half-tone printing plate
US4286385A (en) * 1979-12-26 1981-09-01 Huck Joseph F Color screen indicator

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