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Excelitas Technologies
Multi-zone Irradiance Control in UV LED Systemsfor Uniform Curing of Non-Linear Surfaces
Mike Kay
Director of Product Management, OmniCure®
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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 locations
in the Americas, Europe and Asia
• Design and creation of innovative UV curing solutions
since 1984
• Over 35,000 UV curing systems currently being used in
more than 50 countries
• Lamp and LED UV systems
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Advantages of LED
•
LED systems have manyfunctional advantages over
lamp-based systems
‒ Longer life, reduced energy, lower
heat, lower maintenance, instanton/off, Hg free
• Modular LED arrays allows for
multi-zone irradiance control
‒ Customizable output profiles to
achieve uniform curing
‒ Offers potential of further benefits
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LED Arrays Designed for Multi-zone
Irradiance Control
• LED building blocks‒ Arrays made up of multiple
smaller modules
• Patented technology to allow for
individual control of module
segments within array‒ Increase flexibility
‒ Customize output profile
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• Optical 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
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• Optical output of LED modules will have tighter tolerance
‒ Results in uniform curing across LED array
+/-5%
Uniformity of LED Array
• Adjust input to modules to achieve uniform output
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Compensation of Edge Effects
• Irradiance drops off atthe edges of array
– Reduces cure width
• Increase irradiance on
end modules
– Increase useableexposure area
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Multiple Cure Widths
• Selectively turn on onlythe LED modules
required
•
Increases flexibilitywhen curing multiple
widths on same
machine
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Curing on Non-Linear Surfaces
•
3D objects present challengesfor curing
• Radius of parts change working
distance from UV head
– Different output seen at substrateresults in non-uniform curing
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Irradiance vs Working Distance
• Small changes in
working distance can
have significant effect
on irradiance
– 10% drop with 2mm increasein working distance
• Potential for uneven
curing of 3D objects
– Under curing objectsfurther away or over
curing objects that are
closer
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Irradiance vs Working Distance
• Customize irradiance profile
to match shape and
working distance of parts
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Custom Profiles for 3D parts
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Thank You
Questions?
Contact: Mike Kay
Director of Product Management, OmniCure
Excelitas Technologies
uv.eb West 2015: Booth #42
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