The imagesetter appeared in the world with the development of printing technology. In 1048, China's Bi Sheng invented the movable type printing, which is a milestone in printing technology. Four hundred years later, in 1448, the German Gutenberg invented the typeface printing using metal melting and casting. World printing began the era of "fire and boat".
In the middle of this century, with the development and application of electronic technology, laser technology and polymer materials, the world's printing has brought about tremendous changes. Some countries with more developed industries have realized the upgrading of printing technology. "Achieved long-term progress. Foreign countries have invented the first, second, third and fourth generation photo typesetting machines. This imagesetter is connected to a computer to form an editing and typesetting system, which can replace formal publications such as typefaces, typographical books, newspapers, etc., and significantly improve labor productivity.
The first generation was a manual photo-aligning machine, which was first created in the United States in 1946. Unlike the letterpress type, the font is not made up of typefaces but on lithographs. Under the control of the keyboard, the selected word is aligned with a window and is sensitized on the negative film under strong illumination. China has mass-produced manual photo-aligning machines.
The second generation is an optical camera. The first in the United States in 1951. The text is engraved on a disc or cylinder, and the disc moves at high speed during the photographing process.
The third generation is the cathode line photo-aligning machine. It was first created in West Germany in 1965 and gradually matured in the late 1960s. In the computer, the digital output device is a dot font shape memory is a cathode ray tube, or the Western alphabet characters scanned on the screen dot image on the film.
The fourth generation is a laser imagesetter. The first in Britain in 1976. It has all the advantages of the three generations of machines, and the requirements for the film are very low. In addition, it is more attractive to be able to transition to laser direct typesetting, which is the future development direction.
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