Multi-zone Irradiance Control in UV LED Systems for Uniform Curing of Non-Linear Surfaces. LED systems have many functional advantages over lamp-based systems. Modular LED arrays allows for multi-zone irradiance control.

2. Excelitas
Technologies
Mul$-­‐zone
Irradiance
Control
in
UV
LED
Systems
for
Uniform
Curing
of
Non-­‐Linear
Surfaces
Mike
Kay
Director
of
Product
Management,
OmniCure®

3. Who
We
Are
• Lumen
Dynamics
was
acquired
by
Excelitas
Technologies
Company
in
November
2013
• Excelitas
has
over
5,000
employees
worldwide
• Global
network
of
design
and
manufacturing
loca$ons
in
the
Americas,
Europe
and
Asia
• Design
and
crea$on
of
innova$ve
UV
curing
solu$ons
since
1984
• Over
35,000
UV
curing
systems
currently
being
used
in
more
than
50
countries
• Lamp
and
LED
UV
systems

4. Advantages
of
LED
• LED
systems
have
many
func;onal
advantages
over
lamp-­‐based
systems
‒ Longer
life,
reduced
energy,
lower
heat,
lower
maintenance,
instant
on/off,
Hg
free
• Modular
LED
arrays
allows
for
mul;-­‐zone
irradiance
control
‒ Customizable
output
profiles
to
achieve
uniform
curing
‒
Offers
poten$al
of
further
benefits

5. LED
Arrays
Designed
for
Mul;-­‐zone
Irradiance
Control
• LED
building
blocks
‒ Arrays
made
up
of
mul$ple
smaller
modules
• Patented
technology
to
allow
for
individual
control
of
module
segments
within
array
‒ Increase
flexibility
‒ Customize
output
profile

6. • Op$cal
output
of
LED
modules
at
same
input
will
vary
• Results
in
non-­‐uniform
curing
across
array
+/-­‐
13%
Output
measured
at
1mm
–
no
lens
Uniformity
of
LED
Array
• All
modules
at
same
input
power

7. • Op$cal
output
of
LED
modules
will
have
$ghter
tolerance
‒ Results
in
uniform
curing
across
LED
array
+/-­‐5%
Uniformity
of
LED
Array
• Adjust
input
to
modules
to
achieve
uniform
output

8. Compensa;on
of
Edge
Effects
• Irradiance
drops
off
at
the
edges
of
array
– Reduces
cure
width
• Increase
irradiance
on
end
modules
– Increase
useable
exposure
area

9. Mul;ple
Cure
Widths
• Selec;vely
turn
on
only
the
LED
modules
required
• Increases
flexibility
when
curing
mul;ple
widths
on
same
machine

10. Curing
on
Non-­‐Linear
Surfaces
• 3D
objects
present
challenges
for
curing
• Radius
of
parts
change
working
distance
from
UV
head
– Different
output
seen
at
substrate
results
in
non-­‐uniform
curing

11. Irradiance
vs
Working
Distance
• Small
changes
in
working
distance
can
have
significant
effect
on
irradiance
– 10%
drop
with
2mm
increase
in
working
distance
• Poten;al
for
uneven
curing
of
3D
objects
– Under
curing
objects
further
away
or
over
curing
objects
that
are
closer

12. Irradiance
vs
Working
Distance
• Customize
irradiance
profile
to
match
shape
and
working
distance
of
parts

13. Custom
Profiles
for
3D
parts

14. Thank
You
Ques;ons?
Contact:
Mike
Kay
Director
of
Product
Management,
OmniCure
Excelitas
Technologies
uv.eb
West
2015:
Booth
#42
Mike.Kay@excelitas.com
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