REPRODUCTION OF HALFTONE BY SINGLE SPOT MULTIBEAM LASER RECORDING

PROBLEM TO BE SOLVED: To enable screen reproduction of a contone image having improved reproducing characteristics which are called as gradation characteristics for highlight and shadow tone by making at least two radiation beams to collide against one microdot. SOLUTION: The DATA pattern 21 is sent...

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Bibliographische Detailangaben
Hauptverfasser:	OVERMEER ROBERT, BOSSCHAERTS JACOBUS, DELABASTITA PAUL, VAN HUNSEL JOHAN
Format:	Patent
Sprache:	eng
Schlagworte:	APPARATUS SPECIALLY ADAPTED THEREFOR AUXILIARY PROCESSES IN PHOTOGRAPHY CINEMATOGRAPHY COLOUR PRINTING CORRECTION OF TYPOGRAPHICAL ERRORS ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY ELECTROGRAPHY HOLOGRAPHY i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME LINING MACHINES MATERIALS FOR SURFACES USED IN PRINTING MACHINES FOR PRINTING,INKING, DAMPING, OR THE LIKE MATERIALS THEREFOR ORIGINALS THEREFOR PERFORMING OPERATIONS PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR,STEREO-PHOTOGRAPHIC PROCESSES PHOTOGRAPHY PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES,e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTORDEVICES PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION PREPARING SUCH SURFACES FOR USE AND CONSERVING THEM PRINTING PRINTING PLATES OR FOILS PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES PROCESSES FOR THE MANUFACTURE OR REPRODUCTION OF PRINTINGSURFACES SELECTIVE PRINTING MECHANISMS STAMPS TRANSPORTING TYPEWRITERS
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To enable screen reproduction of a contone image having improved reproducing characteristics which are called as gradation characteristics for highlight and shadow tone by making at least two radiation beams to collide against one microdot. SOLUTION: The DATA pattern 21 is sent through a modulator driver 19 to an acoustooptic modulator 13. Carrier waves which produce sound waves in the modulator 13 are modified by the bit pattern. When all data bits 21 are converted into acoustic energy, a narrow light pulse is produced from a laser diode 11 by the SYNC pule 22. With this light pulse, the acoustic field is focused on a photosensitive material 17 to form the permanent record of the data pattern. By moving the focusing element 17, a new bit pattern is recorded. At one time during exposure, at least two radiation beams are made to collide against one microdot.