Patterned marking of multilayer optical film by thermal conduction
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02B-005/30
G02B-005/08
G02B-005/28
출원번호
US-0916819
(2014-09-03)
등록번호
US-9864120
(2018-01-09)
국제출원번호
PCT/US2014/053883
(2014-09-03)
국제공개번호
WO2015/034910
(2015-03-12)
발명자
/ 주소
Free, Michael Benton
Wolk, Martin B.
Biernath, Rolf W.
Johnson, Stephen A.
Merrill, William W.
Edmonds, William F.
Jalbert, Claire A.
출원인 / 주소
3M INNOVATIVE PROPERTIES COMPANY
대리인 / 주소
Iden, Daniel J.
인용정보
피인용 횟수 :
2인용 특허 :
38
초록▼
A multilayer optical film (130) has a packet of microlayers that selectively reflect light by constructive or destructive interference to provide a first reflective characteristic. At least some of the microlayers are birefringent. A stabilizing layer attaches to and covers the microlayer packet pro
A multilayer optical film (130) has a packet of microlayers that selectively reflect light by constructive or destructive interference to provide a first reflective characteristic. At least some of the microlayers are birefringent. A stabilizing layer attaches to and covers the microlayer packet proximate an outer exposed surface of the film Heating elements (122) can physically contact the film to deliver heat to the packet through the stabilizing layer by thermal conduction, at altered regions of the film, such that the first reflective characteristic changes to an altered reflective characteristic in the altered regions to pattern the film The stabilizing layer provides sufficient heat conduction to allow heat from the heating elements to change (e.g. reduce) the birefringence of the birefringent microlayers disposed near the outer exposed surface in the altered regions, while providing sufficient mechanical support to avoid substantial layer distortion of the microlayers near the outer exposed surface in the altered regions.
대표청구항▼
1. A patterned multilayer optical film having an outer exposed surface, comprising: a packet of microlayers arranged to selectively reflect light by constructive or destructive interference to provide a first reflective characteristic, the microlayers comprising thermoplastic materials; anda stabili
1. A patterned multilayer optical film having an outer exposed surface, comprising: a packet of microlayers arranged to selectively reflect light by constructive or destructive interference to provide a first reflective characteristic, the microlayers comprising thermoplastic materials; anda stabilizing layer attached to and covering the packet of microlayers proximate the outer exposed surface, the stabilizing layer comprising a thermoset material;wherein the packet of microlayers is selectively altered in a pattern to provide the first reflective characteristic in one or more unaltered regions and a second reflective characteristic, different from the first reflective characteristic, in one or more altered regions;wherein the packet of microlayers includes a first and second group of microlayers each having a birefringence in the unaltered regions, and wherein the first group of microlayers substantially maintain the birefringence in the altered regions, and the second group of microlayers have a changed birefringence in the altered regions relative to the unaltered regions, the group of second microlayers being closer than the group of first microlayers to the outer exposed surface; andwherein the one or more altered regions have an optical haze of no more than 20%. 2. The film of claim 1, wherein the stabilizing layer is a hard coat layer. 3. The film of claim 1, further comprising a lubricant layer attached to and covering the stabilizing layer, the lubricant layer comprising a non-polymer lubricant material comprising wax. 4. The film of claim 1, further comprising a thermal buffer layer at least partially covering the stabilizing layer, the thermal buffer layer being effective to inhibit heat-induced birefringence reduction of the second group of microlayers in one or more zones of the film in which the thermal buffer layer covers the stabilizing layer, such zones referred to as non-writable zones. 5. The film of claim 4, wherein the thermal buffer layer covers substantially an entire major surface of the stabilizing layer, such that substantially all of the film is rendered non-writable. 6. The film of claim 4, wherein the thermal buffer layer is substantially absent from one or more zones of the film, such zones referred to as writable zones, such that the film comprises both writable zones and non-writable zones. 7. The film of claim 6, wherein the one or more non-writable zones at least partially overlap with the one or more altered regions. 8. A multilayer optical film having an outer exposed surface, comprising: a packet of microlayers arranged to selectively reflect light by constructive or destructive interference to provide a first reflective characteristic, the microlayers comprising thermoplastic materials, at least some of the microlayers being birefringent; anda stabilizing layer attached to and covering the packet of microlayers proximate the outer exposed surface;wherein the stabilizing layer comprises a thermoset material and is tailored to, upon exposure of a region of the film to a thermal printer at the outer exposed surface, provide sufficient heat conduction to allow heat from the thermal printer to change the birefringence of the birefringent microlayers disposed near the outer exposed surface in such exposed region, while also providing sufficient mechanical support to inhibit distortion of the microlayers near the outer exposed surface in such exposed region, the changed birefringence associated with an altered reflective characteristic for the packet of microlayers different from the first reflective characteristic. 9. The film of claim 8, wherein the outer exposed surface is a surface of the stabilizing layer. 10. The film of claim 8, wherein the stabilizing layer provides sufficient mechanical support such that, upon the exposure of the region of the film to the thermal printer at the outer exposed surface, an optical haze of the optical film due to layer distortion in said exposed region is no more than 10%. 11. The film of claim 8, the film further comprising a lubricant layer covering the stabilizing layer, the lubricant layer comprising a non-polymer lubricant material comprising wax. 12. The film of claim 8, wherein the stabilizing layer is a hard coat layer. 13. The film of claim 8, further comprising a thermal buffer layer partially covering the stabilizing layer, the thermal buffer layer being patterned to have a variable thickness to define one or more writable zones and one or more non-writable zones of the film. 14. The film of claim 13, wherein the thermal buffer layer has a physical thickness in the one or more non-writable zones, the physical thickness being at least 5 microns. 15. The film of claim 14, wherein the thermal buffer layer is substantially absent from the one or more writable zones.
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Free, Michael Benton; Wolk, Martin B.; Biernath, Rolf W.; Johnson, Stephen A.; Merrill, William W.; Edmonds, William F.; Jalbert, Claire A., Patterned marking of multilayer optical film by thermal conduction.
Free, Michael Benton; Wolk, Martin B.; Biernath, Rolf W.; Johnson, Stephen A.; Merrill, William W.; Edmonds, William F.; Jalbert, Claire A., Patterned marking of multilayer optical film by thermal conduction.
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