multi-zone irradiance control in uv led systems for uniform curing of non-linear surfaces
TRANSCRIPT
Excelitas Technologies
Mul$-‐zone Irradiance Control in UV LED Systems for Uniform Curing of Non-‐Linear Surfaces
Mike Kay
Director of Product Management, OmniCure®
Who We Are • Lumen Dynamics was acquired by Excelitas
Technologies Company in November 2013
• Excelitas has over 5,000 employees worldwide
• Global network of design and manufacturing loca$ons in the Americas, Europe and Asia
• Design and crea$on of innova$ve UV curing solu$ons since 1984
• Over 35,000 UV curing systems currently being used in more than 50 countries
• Lamp and LED UV systems
Advantages of LED
• LED systems have many func;onal advantages over lamp-‐based systems ‒ Longer life, reduced energy, lower heat, lower maintenance, instant on/off, Hg free
• Modular LED arrays allows for mul;-‐zone irradiance control ‒ Customizable output profiles to achieve uniform curing
‒ Offers poten$al of further benefits
LED Arrays Designed for Mul;-‐zone Irradiance Control
• LED building blocks ‒ Arrays made up of mul$ple smaller modules
• Patented technology to allow for individual control of module segments within array ‒ Increase flexibility ‒ Customize output profile
• Op$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
• 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
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
Mul;ple Cure Widths
• Selec;vely turn on only the LED modules required
• Increases flexibility when curing mul;ple widths on same machine
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
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
Irradiance vs Working Distance
• Customize irradiance profile to match shape and working distance of parts
Custom Profiles for 3D parts
Thank You
Ques;ons?
Contact: Mike Kay
Director of Product Management, OmniCure Excelitas Technologies
uv.eb West 2015: Booth #42 [email protected]
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