Filter
Top Products
If you use an application program that produces graphics, or a
package such as a spreadsheet that produces graphics, ail you need to
know about dot graphics is how to use the program. If, on the other
hand, you wish to do your own programming or merely wish to
understand how the LQ-2500 prints graphics, read on.
Income Breakdown
The Print Head
To understand dot graphics you need to know a little about how the
LQ’s print head works.
The LQ’s print head has 24 pins. As it moves across the page,
electrical impulses cause the pins to fire. pressing the inked ribbon
against the paper to produce a pattern of small dots. As the head moves
across the paper, the pins fire time after time in different patterns to
produce letters, numbers, or symbols.
Because the dots overlap each other both horizontally and vertically
in the Letter Quality mode, it is difficult to see individual dots. Instead,
the letters and symbols seem to be made of unbroken lines.
In order for the dots to overlap vertically the pins are arranged on the
print head in more than one column. The intelligence of the printer
handles the timing of pin firings so that the effect is that of 24 pins
arranged in a single vertical column.
6-2
Graphics and Userdefined Characters