The Print Matrix; The Print Head - Epson SQ-2000 Operating Manual

As the print head moves across the page, electrical impulses
cause the appropriate nozzles to release ink against the the paper,
causing a single dot to print with each impulse. Figure 5-1 shows
the print head as it prints a capital H. In the first column, six
nozzles release ink, and in the next four columns, one nozzle
releases ink. In the last column six nozzles release ink again.

The print matrix

Now that you know how the print head works, it's important
to understand how the characters are defined and stored in the
SQ-2000's memory. As mentioned earlier, each character is com-
posed of a series of dots arranged on a matrix.
The matrix is 24 dots high-one dot for each nozzle on the
SQ-2000 print head. The width of the character matrix is depen-
dent upon the character set in use. For draft characters, the grid is
nine dots wide. Letter quality characters are defined on a grid
which is 15 dots wide, but the dots are placed closer to each
other. The grid for proportional characters is 37 dots wide, with
the dots spaced even more closely.
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Figure 5-1. The print head