The development of pre-press phototypesetting has gone through four dynasties, and each generation of phototypesetting machine has its own characteristics and different working principles. The author briefly introduces the working principle of each phototypesetting machine.
The "first generation" imagesetter is a manual imagesetter, a combination of typewriter and camera.
"Second generation" imagesetter, also called photoelectric automatic imagesetter. Its working principle is: through the keyboard punching machine, according to the typesetting requirements, hit the text on the perforated paper tape, and then correct it by the computer, enter the automatic shooting system, controlled by the electronic computer, select the word on the font version, pass Optical system, exposure and imaging on photosensitive materials, automatically complete the phototypesetting work.
"Third Generation" Phototypesetter
The "third generation" phototypesetting machine is a cathode ray tube (CRT) automatic phototypesetting machine, also known as a fully electronic automatic phototypesetting. Its working principle is: the text is compiled into digital, stored in a memory or made into a word template, stored, displayed and imaged on the X-ray screen of the cathode ray tube by electronic scanning, and then projected onto the photosensitive material exposure.
"Fourth Generation" Phototypesetter
"Fourth generation" imagesetter, also called laser imagesetter. The working principle of laser phototypesetting is: using laser plane line scanning, the laser beam is output by the helium-neon laser, and the font processed by the computer is focused on the photosensitive material through the multi-faceted rotating mirror projection to form the layout of the text.
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