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US 10,884,166 B2Granted
Retroreflective sheeting including cube corner elements
Assignee3M Innovative Properties Company
InventorKenneth L. Smith
Life of this patent
Estimating the term…
Abstract
The present disclosure is directed to lamina(e) comprising cube corner elements, a tool comprising an assembly of laminae and replicas thereof. The disclosure further relates to retroreflective sheeting.
Claims15
Retroreflective sheeting, comprising:
- a plurality of cube corner elements;
- wherein at least one of the cube corner elements has three dihedral angle errors having a magnitude between 1 arc minute and 60 arc minutes;
- wherein at least one of the cube corner elements forms a hexagonal shape when viewed in plan view;
- and
- wherein at least one of the cube corner elements forms a pentagonal shape when viewed in plan view;
- wherein the cube corner elements comprise preferred geometry cube corner elements,
- wherein the sheeting exhibits an average brightness at 0° and 90° orientation of at least 375 candelas/lux/m2 for an entrance angle of −4° and an observation angle of 0.5°;
- and
- wherein the sheeting exhibits an average brightness at 0° and 90° orientation of at least 625 candelas/lux/m2 for an entrance angle of −4° and an observation angle of 0.2°.
6 more elements
Retroreflective sheeting, comprising:
- a plurality of cube corner elements;
- wherein at least one of the cube corner elements has three dihedral angle errors having a magnitude between 1 arc minute and 60 arc minutes;
- wherein at least one of the cube corner elements forms a hexagonal shape when viewed in plan view;
- and
- wherein at least one of the cube corner elements forms a pentagonal shape when viewed in plan view;
- wherein the cube corner elements comprise preferred geometry cube corner elements,
- wherein the average brightness at 0° and 90° is at least 80 candelas/lux/m2 for an entrance angle of −4° and an observation angle of 1.0°, and
- wherein the sheeting exhibits an average brightness at 0° and 90° orientation of at least 625 candelas/lux/m2 for an entrance angle of −4° and an observation angle of 0.2°.
5 more elements
Dependencies are inferred from the claim text.