Photoplotting method and an arrangement for plotting a...

G - Physics – 06 – F

Patent

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Details

G06F 3/13 (2006.01) B41J 2/447 (2006.01) G06K 15/22 (2006.01) H04N 1/195 (2006.01)

Patent

CA 2234896

A computer stored raster image divided into subareas (A1, B1, C1, ...) with respective raster point positions (r1 - r9) is plotted on a photosensitive record carrier divided into subareas A1', B1', C1', ...) with respective picture element positions (p1 - p9). In relation to the raster points in the r1 positions of all the subareas A1, B1, C1, ..., the picture elements in the p1 positions of all the subareas A1', B1', C1', ... are plotted simultaneously during a first time interval; during subsequent time intervals, the picture elements in the p2 positions are plotted in relation to the raster points in the r2 positions, etc. The plotting process, which is controlled with the aid of a computer program, is carried out by means of a matrix 1 of light modulation elements LA1, LB1, LC1, ..., an aperture matrix a movementmechanism and an image-scale determining lens. The preferred application is theproduction of photographic artwork for printed circuit boards.

Une image matricielle en mémoire, divisée en sous-zones (A1, B1, C1, ...) associées à des positions de points matriciels (r1 - r9), est tracée sur un support d'enregistrement photosensible divisé en sous-zones (A1', B1', C1', ...) associées à des positions d'éléments d'image (p1 - p9). Relativement aux points matriciels des positions r1 de toutes les sous-zones A1, B1, C1, ... , les éléments d'image des positions p1 de toutes les sous-zones A1', B1', C1', ... sont tracés simultanément pendant un premier intervalle de temps; pendant les intervalles de temps suivants, les éléments d'image des positions p2 sont tracés relativement aux points matriciels des positions r2, etc. Le processus de traçage, qui est commandé à l'aide d'un programme informatique, est exécuté au moyen d'une matrice 1 d'éléments de modulation optique LA1, LB1, LC1, ..., d'une matrice d'ouverture, d'un mécanisme de déplacement et d'une lentille de détermination d'échelle d'image. L'application préférée consiste en la production de représentations photographiques de circuits imprimés.

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