Textured retro-reflective marker
AssigneeNorthern Digital Inc.
InventorsLarry Chen, Derek Peter Zwambag, Shaulaine White, Athanasios Tommy Balkos
Life of this patent
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Abstract
A marker comprising: a retro-reflective layer having a first retro-reflectance capability and a border defining a retro-reflective area of the retro-reflective layer. The retro-reflective layer includes a textured surface, a portion of the textured surface having a surface topology such that surface normal vectors positioned across the portion extend from the portion of the textured surface in different directions. A plurality of retro-reflective micro elements are distributed across the textured surface. A portion of the border provides a second retro-reflectance capability lower than the first retro-reflectance capability.
Claims21
1-22. (canceled)
A marker, comprising:
- a retro-reflective layer having a first retro-reflectance capability, the retro-reflective layer comprising:
- a textured surface, a portion of the textured surface having a surface topology such that surface normal vectors positioned across the portion extend from the portion of the textured surface in different directions;
- and
- a plurality of retro-reflective micro elements distributed across the textured surface;
- and
- a border defining a retro-reflective area of the retro-reflective layer,
- wherein a portion of the border provides a second retro-reflectance capability lower than the first retro-reflectance capability, and
- wherein the surface topology includes a sinusoidal geometry that includes a wavelength ranging between 1% and 50% of a size of the retro-reflective area.
A marker, comprising:
- a retro-reflective layer having a first retro-reflectance capability, the retro-reflective layer comprising:
- a textured surface, a portion of the textured surface having a surface topology such that surface normal vectors positioned across the portion extend from the portion of the textured surface in different directions;
- and
- a plurality of retro-reflective micro elements distributed across the textured surface;
- and
- a border defining a retro-reflective area of the retro-reflective layer, wherein a portion of the border provides a second retro-reflectance capability lower than the first retro-reflectance capability,
- wherein the surface topology includes a sinusoidal geometry that includes an amplitude ranging between 0.5% and 25% of a size of the retro-reflective area.
Dependencies are inferred from the claim text.