Screen systems for multicolor printing
AssigneeDr. Ing. Rudolf Hell GmbH
InventorJohannes Schoppmeyer
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Abstract
This invention relates to a screen system for color reproduction wherein screens differing in angle and screen line spacing from color separation to color separation are utilized in each case in the individual color separations. Special screens are specified, whereof the tolerance ranges are situated at 2.degree. for the angles and at approximately 12% for the screen fineness.
Claims9
A screen system for color reproduction comprising first, second, and third screens of different colour separations each having different screen angles and line spacings, said screens having lines which lie at successive angles selected from the ranges of 19.degree. to 24.degree., 25.degree. to 29.degree., and 32.degree. to 36.degree., as measured in a common direction from the first screen to the second screen, and from the second screen to the third screen, the tolerance range for screen fineness extending to plus or minus approximately 12% of the mean screen fineness.
A screen system for colour reproduction comprising first, second, and third screens of different colour separations having different screen angles and line spacings, said screen system comprising one of the sets of screen periods and the corresponding angular settings of the following table:
- ______________________________________ Screen Period Angular Setting d.sub.1 d.sub.2 d.sub.3 .alpha..sub.1,2 .alpha..sub.2,3 ______________________________________ 0.185 0.125 0.185 20-23 33-35 0.160 0.135 0.155 22-23 27-29 0.155 0.135 0.185 27-29 34-35 0.155 0.130 0.170 25-27 35-36 0.155 0.130 0.150 21-24 27-29 0.145 0.130 0.175-80 27-29 31-35 0.145 0.160 0.170 20-22 21-24 0.145 0.125 0.150 25-27 22-24 0.145 0.125 0.170 26-29 34-35 0.140 0.155 0.165 20-23 20-24 0.140 0.125 0.175 27-31 32-35 0.140 0.125 0.150 25-27 22-25 0.125 0.130 0.150 20-26 25-29 ______________________________________
- where d.sub.1, d.sub.2, and d.sub.3 are the screen periods of the first, second, and third screens respectively, .alpha..sub.1,2 is the angle between the lines of the first screen and the second screen, and .alpha..sub.2,3 is the angle between the lines of the second screen and the third screen, measured in the same direction as the angle between the lines of the first screen and the second screen.
Dependencies are inferred from the claim text.