摘要:
Bei der Herstellung einer Druckform wird in die Oberfläche eines Druckformrohlings (1) ein Relief dadurch eingebracht, daß Material des Druckformrohlings (1) entlang von Spuren durch Strahlung abgetragen wird. Zu diesem Zweck werden entlang jeweils ein und derselben Spur unterschiedlich tief liegende Reliefbereiche durch entsprechend häufiges Bestrahlen erzeugt.
摘要:
A plotter for recording an image on a sheet of light sensitive flexible medium. The plotter includes a drum having a wall with a cylindrical inner surface, which is adapted to have the sheet attached thereto. The drum is rotatable about the geometric axis of the cylindrical inner surface. The plotter also includes an electro-optical assembly for projecting at least one modulatable light beam onto the inner surface.
摘要:
The invention relates to a process and device for exposing imaging material. A light beam (2) generated in a light source (1) is modulated linewise during an exposure time in a video modulator (5) and deflected over the imaging material (9) by means of a light beam deflector (7). During a returm time following the exposure time the video modulator (5) is deactivated. To present back-reflections, between the light source (1) and the video modulator (5) there is an optical isolator (4) which is switched on during the exposure time by gate pulses. In oder to maintain a constant operating temperature of the optical isolator (4) during the exposure and return times, the optical isolator (4) is swiched on linewise by additional gate pulses (GI) during a compensation time within the return time, during which the optical isolator (4) heats up. The optical isloator (4) is controlled in such a way that the sum of the lenghts of the exposure time and the compensation time is fairly constant within each line.
摘要:
An imagesetter for exposing a medium (12) is disclosed, as is a method of exposing. The imagesetter includes a slowly translating carriage (10), a flat-field scanning optical head (14) translation apparatus to translate the optical head (14) and butting apparatus (31). The optical head (14) scans only a portion of a scan line (38) at a time and thus exposes at least two strips (16) of the medium (12), wherein the strips (14) overlap in a butting zone. The butting apparatus (31) controls the exposure of the medium (12) within the butting zone.
摘要:
An imagesetter of the "internal drum" type for producing an image on a flexible section of photosensitive material does not actually have a drum (10). Instead, the photosensitive material (30) is supported in a cylindrical shape by spaced internal disks (32, 34). The flexible photosensitive material (30) is held in position to pass around the periphery of the disks (32, 34) by rollers (38, 40, 44, 46). In some cases the flexible photosensitive material (30) may be supported by a sheet of flexible, but relatively rigid material (66).
摘要:
An internal drum printing plate plotter and method for using same is disclosed. The plotter provides a smooth path for a printing plate from an input location to a plotting location to an output location. The plotter includes a partially cylindrical drum and a loading tray associated with the drum at one end thereof. The drum covers at least 180 degrees of curvature and has an internal surface and the loading tray and the internal surface define the smooth path.
摘要:
Un compositeur d'image du type à "tabour interne" pour la production d'une image sur une section flexible d'un matériau photosensible ne possède pas réellement de tambour (10). En lieu et place du tambour, le matériau photosensible (30) est supporté dans une forme cylindrique à l'aide de disques internes espacés (32, 34). Le matériau photosensible flexible (30) est maintenu en position afin de passer autour de la périphérie des disques (32, 34) par l'action de rouleaux (38, 40, 44, 46). Dans certains cas, le matériau photosensible flexible (30) peut être supporté par une feuille de matière flexible mais relativement rigide (66).