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BJC-5000
2.2 Printing System
Control functions are provided by conventional printers. In this printer, however, these
control functions are mostly processed by the printer driver of the host computer.
With conventional printers, image data in the raster direction (horizontal direction data)
is created on the printer driver and the printer side receives this data. Consequently,
the image data in raster direction received by the printer is converted into column data
(vertical direction data) by the printer and the printing is executed.
The printer driver on the host computer handle all processes until the creation of
column data matching the printhead installed in the printer. Then, the printer receives
this column data and prints it. (The printer reads the printhead ID and automatically
notifies the host computer of the printhead configuration.) Thus, this printer achieves
high speed printing because it does not need to convert raster data into column data
and can print the data as it is.
2.3 Printing Modes
2.3.1 Printing mode
This printer varies the printing method, such as carriage movement and bubble jet
head driving frequency, in accordance with the cartridge installed, the selected
medium, the selected printing mode, the resolution, and the print data in order to
achieve high-quality printing without any bleeding or shifting in the printout.
When color printing is performed using a single pass, the different colors printed at
the same time overlap, often causing the colors to run. By printing with two or more
delayed passes, there is less color bleeding because the color printed immediately
before is relatively stable by the time the next color is printed over it.
When print data is processed internally by the printer, the data is recognized and the
number of ink nozzles to be used by the black ink is automatically changed.
Characters are printed by taking preventive measures for bleeding and white mist
which are generated at the borders because the characteristics of the color and black
inks differ. This process is carried out as follows: During internal processing by the
printer, the borders where the color and black inks meet are identified. Cyan and
black ink are mixed in the printed black portion to suit the distance and density of
the black and color dots.
2.3.2 Photo print mode
The photo print mode can be used to obtain a print quality with rich gradation that
reduces granularity by printing several times on the same dot using the Photo BJ
cartridge which contains a light density ink.
The printer driver divides the pixel data into 4 values (not printed, print 1 dot, print 2
dots, and print 3 dots) enabling each pixel to be printed using up to 4 gradations.
When the color cartridge and photo auto cartridge are installed, high-quality print is
achieved by using 7 types of inks (cyan, magenta, yellow, black, photo cyan, photo
magenta and photo black). In addition, an improved gray color reproduction has been
provided by the use of 2 types of black inks.
2.3.3 Multi-drop print mode
The color cartridge uses drop modulation technology to print large and small dots
efficiently so that the granularity of low density portions can be reduced. The photo
cartridge of this machine prints small dots only.
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Part 4: Technical Reference
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