Device for determining surface proportion of a printed pattern for printing machines
AssigneeVeb Kombinat Polygraph "Werner Lamberz" Leipzig
InventorsBernd Morgenstern, Helmut Weigend, Gudrun Dietrich
Life of this patent
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Abstract
A series of equidistant measuring heads is arranged at a uniform distance above a surface to be measured. Each head includes a light source emitting light through a narrow exit opening, and two light sensors arranged adjacent the opposite narrow sides of each opening. The light input characteristic of respective sensors is such that light reflected from the measured surface section is detected with a sensitivity which is inversely proportional to the different intensity of illumination of central and marginal points of the measured section.
Claims5
A device for determining printed surface proportion on a pattern to be used in a printing machine, comprising at least one measuring unit including a light source arranged for illuminating with a high light intensity a central area of the printed surface and, with a reduced light intensity, marginal areas at opposite sides of said central area, at least two light sensors each arranged at equal distance above an assigned marginal area whereby the intensity of light reflection from said printed surface against said sensors is in inverse proportion to the different illumination intensities of said central and marginal areas.
Dependencies are inferred from the claim text.