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US 2020/0003935 A1Published application
Retroreflecting article including retarder
Assignee3M Innovative Properties Company
InventorsJohn A. Wheatley, Michael A. McCoy, Tien Yi T.H. Whiting, Guanglei Du, Neeraj Sharma, Kui Chen-Ho, Kenneth A. Epstein
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Abstract
Retroreflecting articles are described. In particular, retroreflecting articles including a quarter wave retarder and a retroreflecting layer are described. The retarder is rotationally invariant and the retroreflecting layer is non-depolarizing. Such articles may be useful for sensor-detectable signs, labels, and garments.
Claims20
A retroreflecting article having a light incidence surface, comprising:
- a retroreflecting layer;
- and
- a retardation layer disposed nearer to the light incidence surface than the retroreflecting layer;
- wherein the retardation layer includes a quarter wave retarder for at least one wavelength in the near infrared range;
- wherein the retroreflecting layer is non-depolarizing;
- and
- wherein the retardation layer is rotationally invariant.
4 more elements
Dependencies are inferred from the claim text.