Raster Settings
This section defines the important parameters for the rasterizer.
Dot Size
The user specifies the diameter of the droplet here.
Nominal Pitch
The user specifies the desired or nominal pitch of the droplets. This can be
expressed either as an absolute value or as a percentage overlap. Note that
because of the grid addressibility it may not be possible to achieve the user’s specific pitch.
The relation between nominal pitch (measured in distance) and percent overap is:
pitch = [droplet diameter] / [ 1 + (percent overlap/100)
Example
If Droplet Diameter = 47 um and pitch = 25 um then percent overlap = 88%.
Dots per UM
This is the grid resolution. In the example shown at left 0.2 dots per UM is
equivlent to 5080 dots per inch which is a 5 um grid on which droplets can be
placed.
Units
The units for entering parameters can be entered here. This has no effect on the
input or output data units which are determined by the units of the input
Gerber file.
Additional Offset
The droplets are automatically offset by 1/2 of their diameter (i.e. the Dot
Size) An engineer may wish to add or subtract from this offset. If so, he can specify
the additional offset here.
