Fingerprint imaging systems comprising self-wetting adhesive, films and methods
A fingerprint imaging system is described comprising a film including an optically transparent self-wetting adhesive layer adhered to an imaging surface of an electronic optical image sensor. Also described is a method of use of an optical imaging system, and a film and multilayer film suitable for use with a fingerprint imaging system.
1. A fingerprint imaging system comprising
a film comprising an optically transparent self-wetting adhesive layer adhered to an imaging surface of an electronic optical image sensor, said self-wetting adhesive comprising at least one of the following: a polydiorganosiloxane polyurea copolymer or polydiorganosiloxane polyoxamide copolymer, a C2-C3 alkylene/a-olefin copolymer, a styrenic block copolymer.
2. The fingerprint imaging system of claim 1 wherein the self-wetting adhesive wets out the imaging surface at a rate no greater than 30, 20, 10, 5, or 1 second/cm 2 .
3. The fingerprint imaging system of claim 1 wherein the self-wetting adhesive is cleanly removable from the imaging surface with a 180 degree peel force of less than 30, 20, 10, 5, or 1 N/dm for a peel rate of 30.5 cm/min.
4. The fingerprint imaging system of claim 1 wherein the film further comprises an optically transparent substrate layer having a major surface adhered to the self-wetting adhesive.
5. The fingerprint imaging system of claim 1 wherein the film further comprises a skin contact layer having a different composition than the self-wetting adhesive disposed on the self-wetting adhesive.
6. The fingerprint imaging system of claim 1 wherein the electronic optical image sensor comprises a lens array comprising lenses, mirrors, or a prism.
7. The fingerprint imaging system of claim 6 wherein the imaging surface further comprises a rigid optically transparent platen disposed between the lens array and the self-wetting adhesive.
8. The fingerprint imaging system of claim 7 wherein the self-wetting adhesive is adhered to the prism or rigid optically transparent platen.
9. The fingerprint imaging system of claim 8 wherein the imaging surface further comprises a conformable optically transparent polymeric layer disposed between the prism and the self-wetting adhesive or disposed between the rigid optically transparent platen and the self-wetting adhesive.
10. The fingerprint imaging system of claim 4 wherein the substrate layer comprises a polymeric film.
11. The fingerprint imaging system of claim 10 wherein the substrate layer further comprises a release additive.
12. The fingerprint imaging system of claim 1 wherein the self-wetting adhesive is a urea-based Pressure Sensitive Adhesive (PSA).
13. The fingerprint imaging system of claim 5 wherein the skin contact layer comprises a polyolefin material, a polyester material, or a mixture thereof.
14. The fingerprint imaging system of claim 5 wherein the film further comprises an additional layer of the same composition as the skin contact layer and an additional self-wetting layer, said additional layers disposed between the self-wetting adhesive layer and the skin contact layer.
15. A method of use of an optical imaging system comprising:
providing a film comprising a self-wetting adhesive; and
adhering the self-wetting adhesive to an imaging surface of an optical image sensor, said self-wetting adhesive comprising at least one of the following: a polydiorganosiloxane polyurea copolymer or polydiorganosiloxane polyoxamide copolymer, a C2-C3 alkylene/a-olefin copolymer, a styrenic block copolymer.
16. The method of claim 15 wherein the self-wetting adhesive wets out the imaging surface at a rate no greater than 30, 20, 10, 5, or 1 second/cm 2 .
17. The method of claim 15 further comprising contacting a person's finger or other body site with the skin contact layer or self-wetting adhesive.
18. The method of claim 15 further comprising replacing the film after a first person and before a second person.
19. The method of claim 17 further comprising removing at least the layer contacted by the person's finger after a first person and before a second person.
20. The fingerprint imaging system of claim 5 , wherein the film further comprises an optically transparent substrate disposed between the self-wetting adhesive and skin contact layer.
21. The fingerprint imaging system of claim 5 wherein the film further comprises a removable release liner in contact with the self-wetting adhesive layer.
22. The fingerprint imaging system of claim 4 wherein the film further comprises at least an additional self-wetting adhesive layer and an additional substrate layer thereby forming a multilayer film comprising a repeating stack of a self-wetting adhesive layer and a substrate layer wherein at least one substrate layer comprises a release agent and one of the self-wetting adhesive layers adheres to the imaging surface.
23. The fingerprint imaging system of claim 5 wherein the film further comprises at least an additional layer having the same composition as the skin contact layer and an additional substrate layer thereby forming a multilayer film comprising a repeating stack of a layer having the composition of the skin contact layer and a substrate layer wherein the substrate layer comprises a release agent.
24. The fingerprint imaging system of claim 23 wherein the multilayer film comprises a self-wetting adhesive layer.
25. The method of claim 15 wherein the self-wetting adhesive is cleanly removable from the imaging surface with a 180 degree peel force of less than 30, 20, 10, 5, or 1 N/dm for a peel rate of 30.5 cm/min.
26. The method of claim 15 wherein the film further comprises an optically transparent substrate layer having a major surface adhered to the self-wetting adhesive.
27. The method of claim 15 wherein the film further comprises a skin contact layer having a different composition than the self-wetting adhesive disposed on the self-wetting adhesive.
28. The method of claim 15 wherein the electronic optical image sensor comprises a lens array comprising lenses, mirrors, or a prism.
29. The method of claim 28 wherein the imaging surface further comprises a rigid optically transparent platen disposed between the lens array and the self-wetting adhesive.
30. The method of claim 29 wherein the self-wetting adhesive is adhered to the prism or rigid optically transparent platen.
31. The method of claim 30 wherein the imaging surface further comprises a conformable optically transparent polymeric layer disposed between the prism and the self-wetting adhesive or disposed between the rigid optically transparent platen and the self-wetting adhesive.
32. The method of claim 26 wherein the substrate layer comprises a polymeric film.
33. The method of claim 32 further comprising a release additive.
34. The method of claim 27 wherein the self-wetting adhesive is a urea-based Pressure Sensitive Adhesive (PSA).
35. The method of claim 27 wherein the skin contact layer comprises a polyolefin material, a polyester material, or a mixture thereof.
36. The method of claim 27 wherein the film further comprises an additional layer of the same composition as the skin contact layer and an additional self-wetting layer, said additional layers disposed between the self-wetting adhesive layer and the skin contact layer.