Method and apparatus for making an offset plate

Details Method and apparatus for making an offset plate Method and apparatus for making an offset plate

B - Operations, Transporting

41

C

B41C 1/055 (2006.01) B41C 1/10 (2006.01) G03F 7/20 (2006.01)

Patent

CA 2301029

A plate making method for forming an image on a heat sensitive blank plate by a multichannel method using a plate making machine of outer surface cylinder scanning type. A blank plate (400) is secured to the outer circumferential surface of a hollow cylinder (131). A laser beam (800) is projected from an optical light head (150) onto the surface of the blank plate (400). The laser beam (800) is a beam group consisting of a plurality of infrared laser beams arranged in line. The laser beam (800) is generated based on an image forming signal. Further, the irradiation time of the laser beam (800) is controlled so that the laser irradiation time is short at the center of the line and long at the ends of the line. Application of the laser beam (800) forms an image corresponding to the image forming signal on the heat sensitive layer of the blank plate (400). The control of laser beam irradiation time ensures formation of an image of significantly improved quality thanks to uniform thermal reaction over the entire surface of the heat sensitive blank plate (400).

L'invention concerne un procédé de fabrication de plaques destiné à la formation d'une image sur une plaque de protection thermosensible par un procédé multivoies faisant appel à un appareil de fabrication de plaques de surface extérieure du type à scanner à tambour. Une plaque de protection (400) est fixée à la surface circonférentielle extérieure d'un cylindre creux (131). Un faisceau laser (800) est projeté à partir d'une tête de lumière optique (150) sur la surface de la plaque de protection (400). Le faisceau laser (800) se constitue d'un groupe de faisceaux formé de plusieurs faisceaux laser infrarouges montés en ligne. Le faisceau laser (800) est généré sur la base d'un signal de formation d'images. En outre, le temps de rayonnement du faisceau laser (800) est régulé de sorte que le temps de rayonnement du laser soit court au centre de la ligne et long aux extrémités de la ligne. L'application du faisceau laser (800) permet de former une image correspondant au signal de formation d'image sur la couche thermosensible de la plaque de protection (400). La régulation du temps de rayonnement du faisceau laser permet de former une image d'une qualité sensiblement améliorée grâce à une réaction thermique uniforme sur la surface entière de la plaque de protection thermosensible (400).

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