|
OLEC Pointlight-Exposure |
Tube-Exposure |
Scan-Light-Source |
Advantage |
UV-output is permanently measured and the
exposure time is automatically adjusted. |
All formats up-to 130 x 200 cm.
Constant UV-output across the whole format. Consequently the
dots and angles are of the same quality on all points of the
format. |
All formats up-to 130 x 200 cm.
UV-output quantity is controlled and displayed. Steep flank
angles for screen dots, consequently an analog dot structure
in CtP-quality. |
|
Steep flank angles with short use of dispersion
sheet.
Risk of not having a good dot base with the result of an unstable
dot. |
|
Very good lighting across the whole format.
Very short exposure time.
Vacuum foil in a guided rail. Easy change of the one light
source.
Optional with light-finishing and post-exposure because of
modular construction. |
Disadvantage |
Format only upto 90 x 130 cm.
If the whole format is used the dots become more and more
sloped to the edges.
Fine lines often, (even when a dispersion sheet is used),
will not become staight. |
UV-tubes, are difficult and sometimes impossible
to measure. |
|
|
High energy is needed
(380V/32 Amp) |
Changing the UV-tubes is very time consuming. |
|
|
Very noisy because of strong exhaustors for
cooling. |
|
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