Lightguide having a viscoelastic layer for managing light
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G02B-006/00
F21V-008/00
출원번호
US-0057498
(2009-07-30)
등록번호
US-9285531
(2016-03-15)
국제출원번호
PCT/US2009/052198
(2009-07-30)
§371/§102 date
20110204
(20110204)
국제공개번호
WO2010/017087
(2010-02-11)
발명자
/ 주소
Sherman, Audrey A.
Meis, Michael A.
Boulos, Marie A.
Schaffer, Kevin R.
Winkler, Wendi J.
출원인 / 주소
3M INNOVATIVE PROPERTIES COMPANY
대리인 / 주소
Iden, Daniel J.
인용정보
피인용 횟수 :
1인용 특허 :
151
초록▼
Disclosed herein is an optical device including a light source and an optical article. The optical article includes a lightguide and a viscoelastic layer disposed on the lightguide. Light emitted by the light source enters the lightguide and is transported within the lightguide by total internal ref
Disclosed herein is an optical device including a light source and an optical article. The optical article includes a lightguide and a viscoelastic layer disposed on the lightguide. Light emitted by the light source enters the lightguide and is transported within the lightguide by total internal reflection. The viscoelastic layer manages light, for example, at least about 50%, or less than about 10%, of light that enters the lightguide may be extracted. The optical device can be used in a variety of constructions for signs, markings, display devices, keypad assemblies, tail light assemblies and illumination devices.
대표청구항▼
1. An optical device comprising a light source and an optical article, the optical article comprising a lightguide and a viscoelastic cladding layer, wherein the viscoelastic cladding layer comprises a pressure sensitive adhesive, wherein the viscoelastic cladding layer has an index of refraction lo
1. An optical device comprising a light source and an optical article, the optical article comprising a lightguide and a viscoelastic cladding layer, wherein the viscoelastic cladding layer comprises a pressure sensitive adhesive, wherein the viscoelastic cladding layer has an index of refraction lower by about 0.2 than an index of refraction of the lightguide and wherein the viscoelastic cladding layer is disposed on the lightguide, and wherein light emitted by the light source enters the lightguide and is reflected at at least a portion of an interface between the lightguide and the viscoelastic cladding layer; and wherein the interface between the lightguide and the viscoelastic cladding layer comprises a plurality of features oriented to extract light being transported within the lightguide. 2. The optical device of claim 1, wherein the viscoelastic cladding layer comprises first and second regions, wherein at least about 50% of light that enters the lightguide is extracted from the lightguide and into the first region, and less than about 10% of light that enters the lightguide is extracted from the lightguide and into the second region. 3. The optical device of claim 1, wherein the lightguide comprises a polymeric material or glass. 4. The optical device of claim 1, wherein the viscoelastic cladding layer comprises a silicone pressure sensitive adhesive. 5. The optical device of claim 1, wherein the viscoelastic cladding layer comprises a stretch releasable pressure sensitive adhesive. 6. The optical device of claim 1, wherein the viscoelastic cladding layer comprises a (meth)acrylate, rubber, silicone, urethane, or a combination thereof. 7. The optical device of claim 1, wherein the viscoelastic cladding layer comprises first and second regions having different refractive indices. 8. The optical device of claim 1, wherein the optical article has a light transmittance of from about 90 to about 100% and a haze value of from about 0.01 to less than about 5%. 9. The optical device of claim 1, the optical article further comprising a first substrate disposed on the viscoelastic cladding layer opposite the lightguide, wherein the first substrate comprises a polymer, metal, glass, ceramic, release liner, a graphic, paper, fabric, grease, antiseptic gel, or a combination thereof. 10. The optical device of claim 9, wherein the first substrate emits light extracted from the viscoelastic cladding layer. 11. The optical device of claim 10, wherein at least about 50% of light extracted from the viscoelastic cladding layer is emitted from the first substrate. 12. The optical device of claim 10, wherein a surface of the first substrate comprises a plurality of features oriented to emit light from the first substrate. 13. The optical device of claim 10, wherein the first substrate comprises an imaged polymeric film. 14. The optical device of claim 10, wherein light is emitted uniformly from the first substrate. 15. The optical device of claim 10, wherein light is emitted in one or more predetermined directions from the first substrate. 16. The optical device of claim 10, wherein light is emitted at different intensities from the first substrate. 17. The optical device of claim 9, wherein the first substrate does not emit light. 18. The optical device of claim 1, the optical article further comprising a first substrate disposed on the viscoelastic cladding layer opposite the lightguide, wherein the first substrate comprises a multilayer optical film, a reflector, a mirror, a polarizer, a prismatic film, a three-quarter polarizer, a retroreflective film or a combination thereof. 19. The optical device of claim 1, the optical article further comprising a third substrate disposed on the lightguide opposite the viscoelastic cladding layer, wherein the third substrate comprises a multilayer optical film, a reflector, a mirror, a polarizer, a prismatic film, a three-quarter polarizer, a retroreflective film, polymer, metal, glass, ceramic, a graphic, paper, fabric or a combination thereof. 20. The optical device of claim 19, wherein the third substrate emits light extracted from the lightguide. 21. The optical device of claim 19, wherein the third substrate comprises an imaged polymeric film. 22. The optical device of claim 19, wherein light is emitted uniformly from the third substrate. 23. The optical device of claim 19, wherein light is emitted in one or more predetermined directions from the third substrate. 24. The optical device of claim 19, wherein light is emitted at different intensities from the third substrate. 25. A sign or marking comprising the optical device of claim 1. 26. A display device comprising a display panel and the optical device of claim 1. 27. A keypad assembly comprising one or more keys and the optical device of claim 1. 28. A tail light assembly suitable for use with a vehicle, the tail light assembly comprising a housing, a transparent cover and the optical device of claim 1. 29. An illumination device comprising a housing and the optical device of claim 1.
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