Multi-attribute light effects for use in curing and other applications involving photoreactions and processing
View Patent ↗Systems and methods that provide multi-attribute light effects, including one or more channels for each light effect, preferably both channels being provided in an array of solid state light emitters.
1. A method for performing a photo reaction on a target object, comprising:
emitting from a light source a continuous output of irradiance onto the target object having a first photo-reactive Zone A, and a second photoreactive Zone B;
superimposing over the continuous light output a pulsed light output of irradiance onto the target object, with the pulsed output having a peak irradiance level greater than that of the continuous light output;
wherein the target object has a first Zone A that has a photo-reactive character for curing that is different from a Zone B, and the pulsed light output enhances a photo-reaction in Zone A relative to the continuous light output.
2. The method of claim 1 wherein the light source comprises an array of solid state light emitters having a power output/cm 2 from about 500 mQ/cm 2 to about 4 W/cm 2 .
3. The method of claim 2 wherein the wavelength of light from the first and second channels is within the range of from about 420 nm to about 150 nm.
4. The method of claim 2 wherein the continuous emission has an irradiance within the range of from about 100 mW/cm 2 to about 1.5 W/cm 2 .
5. The method of claim 4 wherein the pulsed emission has a peak irradiance within a range of from about 1 W/cm2 to about 30 W/cm2 and the ratio for the peak of the pulse to the base of the pulse is at least about 0.02 to about 100.
6. The method of claim 2 wherein the output is provided by groups of emitters comprising a first group of one or more emitters dedicated to the continuous output and a second group of emitters dedicated to providing the pulsed output.
7. The method of claim 2 wherein the output is provided by a group of emitters dedicated to providing both the continuous and pulsed outputs.
8. The method of claim 2 wherein the continuous and pulsed output profiles, respectively, are selected so as to couple into respective absorption bands for predetermined Zone A and Zone B photo-reactants.
9. The method of claim 2 wherein the polymerization reagents in the target object comprise a photo-initiator compound and a monomer or oligomer reactive with the compound.
10. The method of claim 9 wherein the polymerization reagents are selected from the group consisting of reagents for epoxies, acrylates, polyimides and polyamides.
11. The method of claim 9 wherein the method comprises an application fur curing inks; automotive coatings; industrial coatings' cement or concrete coatings; adhesives; tape release polymers in semiconductor processes; paints; or lithography.
12. The method of claim 2 wherein the method is used in an application comprising cleaning or sterilizing the target object.
13. The method of claim 1 wherein the wavelength of light from the first and second channels is within the range of from about 1800 nm to about 150 nm.
14. The method of claim 1 wherein the continuous emission has an irradiance within the range of from about 100 mW/cm 2 to about 10,000 mW/cm 2 .
15. The method of claim 14 wherein the pulsed emission has a peak irradiance within a range of from about 5 W/cm 2 .
16. The method of claim 1 wherein the duty cycle for the pulsed emission is from about 1% to about 50% at about 0.02 Hz to about 40,000 Hz.
17. The method of claim 1 wherein the duty cycle for the pulsed emission is from about 1% to about −25% at about 0.02 Hz to about 40,000 Hz.
18. The method of claim 1 wherein the duty cycle for the pulsed emission is from about 1% about 10% at about 0.02 Hz to about 40,000 Hz.
19. The method of claim 1 further comprising introducing during light output a laminar flow across a surface area of the material exposed to the light.
20. The method of claim 19 wherein an inerting agent is introduced via the laminar flow.
21. The method of claim 1 wherein the target object comprises CD or DVD.
22. A product comprising a photo-reacted target object, the target object being formed by a method comprising:
emitting from a light source a continuous level of irradiance onto the target object having a first photo-reactive Zone A, and a second photoreactive Zone B;
superimposing over the continuous light output a pulsed light output having a peak irradiance level greater than that of the irradiance level of the continuous light output;
wherein the target object has a first Zone A that has a photo-reactive character for curing that is different from a Zone B, and the pulsed light output enhances a photo-reaction in Zone A relative to the continuous light output.