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Laser Beam Printer Technology
Intermediate Transfer Drum for Superior Paper Management  Intermediate transfer drum and printing process One modification we have made in our copying machine engines is the adoption of an intermediate transfer drum. Instead of transferring yellow, magenta, cyan and black toners directly onto paper coiled around the transfer drum, a four-color toner image is first created in the intermediate transfer drum and then transferred onto the paper. Since it is not necessary to coil paper around the drum, a wide variety of paper media can be used, including envelopes, labels and thick paper. Using the intermediate transfer drum led to the problem
of disposal of untransferred toner from the drum. Our new spherical S toner, however,
facilitates electric charge control and simplifies the return of toner to the photosensitive
drum's Cleaning box, thus avoiding complex maintenance procedures.
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To make the most of the new engine's capabilities, we had to
develop a controller to perform processes suited to the engine's characteristics
and send suitable image data to the engine. To this end, instead of the conventional
method of having all processes controlled by the main central processing unit (CPU),
Canon has developed a system incorporating both the main CPU and a dedicated graphics
chip. The main CPU controls overall input and output commands, and the graphics chip
creates bit maps while performing color rendering and image compression/enlargement
functions matching the characteristics of the engine. This system enhances efficiency
and allows the creation of high-quality images.
Printer
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