The single original laser beam generated by the laser is split into multiple beams (usually 200-500 beams) by multiple optical fibers or a complex high-speed rotating optical splitting beam system. The characteristics of the brightness and darkness of the image information in the computer, after modulating the brightness and darkness of the laser beam, become a controlled beam. After focusing again, hundreds of micro-lasers directly hit the surface of the printing plate for engraving. After scanning the engraving, a latent image of the image is formed on the printing plate. After development, the image information on the computer screen is restored on the printing plate for direct printing by the offset press. The diameter of each micro laser beam and the light intensity distribution shape of the beam determine the resolution and resolution of the latent image forming the image on the printing plate. The smaller the spot size of the microbeam, and the closer the light intensity distribution of the beam is to a rectangle (ideal case), the higher the resolution of the latent image. The scanning accuracy depends on the mechanical and electronic control parts of the system. The number of laser microbeams determines the length of the scanning time. The greater the number of microbeams, the shorter the time to etch a plate. At present, the diameter of the beam has grown to 4.6 microns, which is equivalent to a printing accuracy of 600 lpi. The number of beams can reach 500. The time to etch a folio plate can be completed in 3 minutes. On the other hand, the higher the output power and energy density of the plate beam (laser energy generated per unit area in Joules / cm2), the faster the etching speed. But too high power will also have the negative effects of shortening the working life of the laser and reducing the quality of the beam distribution.
The light source of the plate-making machine includes: gas laser (argon ion laser 488nm, power: about 20mw); solid-state laser (FD YAG 532nm, more than 100mw); semiconductor laser (LD, infrared semiconductor laser in semiconductor laser has the advantages of low power and long life .)
The direct plate-making system is a comprehensive multi-disciplinary technology industry, which includes precision machinery and optical technology, electronic technology, color digital image technology, computer and software technology, new printing plate and material technology, automation technology and network technology. The automatic production system is another major technological revolution in the contemporary printing industry.
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