METHODE ET DISPOSITIF POUR FORMER PAS A PAS UNE IMAGE A PARTIR D'UN ORIGINAL

• Main Author: ANGELO BALZAN ET HANS STROPPEL
• Format: Patent
• Language: French
• Published: 14.05.1982
• Subjects: APPARATUS SPECIALLY ADAPTED THEREFOR; CINEMATOGRAPHY; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; ELECTROGRAPHY; HOLOGRAPHY; LINING MACHINES; MATERIALS THEREFOR; ORIGINALS THEREFOR; PERFORMING OPERATIONS; PHOTOGRAPHY; PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES; PHYSICS; PICTORIAL COMMUNICATION, e.g. TELEVISION; PRINTING; PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES; STAMPS; TRANSPORTING; TYPEWRITERS

UN ORGANE D'EXPLORATION 3 MOBILE PAR RAPPORT A UN ORIGINAL 2 EST PREVU POUR EXPLORER CELUI-CI. LA LUMIERE EMISE PAR UN SECTEUR 4 DE L'ORIGINAL EST PROJETEE PAR UN SYSTEME OPTIQUE 9, 10 SUR UNE PLURALITE DE PHOTOSENSEURS 6A, B, C; 8A, B, C DONT LES SIGNAUX DE SORTIE SONT AMPLIFIES 14, 17 EN PARTIE CHANGES DE SIGNES, PUIS ADDITIONNES 18. EN FONCTION DE LA SOMME AINSI CALCULEE UN PROCESSEUR 16 PRODUIT UN SIGNAL POUR COMMANDER UN BURIN 23 LEQUEL GRAVE SUR UN CLICHE 22 SE MOUVANT DE FACON SYNCHRONE AVEC L'ORIGINAL UNE IMAGE 27 DU SECTEUR 4. LA REPONSE LOCALE DES DIFFERENTS PHOTOSENSEURS PEUT ETRE RENDUE VARIABLE PAR L'UTILISATION DE FILTRES 19, 20 A FACTEUR DE TRANSMISSION VARIABLE D'UN POINT A L'AUTRE. A scanning device movable with respect to an original is provided for scanning the latter. An optical system focuses the light emitted by a region of the original on a plurality of photo-sensors, the output signals of which are then amplified, selectively inverted, and added. The summed up signal thus obtained is input into a processor which generates a driving signal for controlling a stylus which moves in synchronism with the original relatively to a printing cylinder, and engraves on it an image of said region. The response of the photosensors to light which issues from different parts of the region can be regulated by means of optical filters having locally varying densities.