Optical security device based on a surface of revolution
An optical article printed on a substrate may include an organic binder; and a plurality of reflective magnetic platelets provided in the organic binder, wherein the plurality of reflective magnetic platelets are substantially aligned in accordance with at least part of a surface of revolution, and wherein the plurality of reflective magnetic platelets are aligned to cause a first reflective effect of the optical article when the substrate is rotated around a first axis and to cause a second reflective effect of the optical article when the substrate is rotated around a second axis, wherein the first reflective effect is different from the second reflective effect.
1. An optical article printed on a substrate, comprising:
a plurality of reflective magnetic platelets,
wherein the plurality of reflective magnetic platelets are aligned to exhibit a funnel-shaped reflection in a view without rotating the substrate around an axis,
wherein the plurality of reflective magnetic platelets are aligned to cause a reflective effect in a different view,
wherein the reflective effect is different from the funnel-shaped reflection,
wherein the reflective effect comprises one of:
a first lateral motion of a first portion of the funnel-shaped reflection that is different from a second lateral motion of a second portion of the funnel-shaped reflection, or
a widening or a narrowing of a portion of the funnel-shaped reflection, and
wherein the different view is different from the view without rotating the substrate around the axis.
2. The optical article of claim 1 , wherein the different view occurs when the substrate is rotated around the axis.
3. The optical article of claim 1 , wherein the axis is a vertical axis.
4. The optical article of claim 1 , wherein the reflective effect comprises the first lateral motion of the first portion of the funnel-shaped reflection that is larger than the second lateral motion of the second portion of the funnel-shaped reflection.
5. The optical article of claim 1 , wherein the first portion of the funnel-shaped reflection is a top portion of the funnel-shaped reflection.
6. The optical article of claim 1 , wherein the second portion of the funnel-shaped reflection is a bottom portion of the funnel-shaped reflection.
7. The optical article of claim 1 ,
wherein the portion of the funnel-shaped reflection is the first portion of the funnel-shaped reflection, and
wherein the reflective effect comprises the widening of the first portion of the funnel-shaped reflection in relation to the second portion of the funnel-shaped reflection.
8. The optical article of claim 1 ,
wherein the portion of the funnel-shaped reflection is a bottom portion of the funnel-shaped reflection, and
wherein the reflective effect comprises the narrowing of the bottom portion of the funnel-shaped reflection in relation to another portion of the funnel-shaped reflection.
9. The optical article of claim 1 , wherein the axis is a horizontal axis.
10. The optical article of claim 1 ,
wherein the portion of the funnel-shaped reflection is a top portion of the funnel-shaped reflection, and
wherein the reflective effect comprises the widening of the top portion of the funnel-shaped reflection in relation to another portion of the funnel-shaped reflection.
11. The optical article of claim 1 ,
wherein the view without rotating the substrate around the axis is a first view,
wherein the different view is a second view,
wherein the reflective effect is a first reflective effect, and
wherein the plurality of reflective magnetic platelets are aligned to cause a second reflective effect in a third view.
12. The optical article of claim 11 ,
wherein the axis is a first axis,
wherein the second view occurs when the substrate is rotated around the axis, and
wherein the third view occurs when the substrate is rotated around a second axis that is orthogonal to the first axis.
13. An optical article printed on a substrate, comprising:
a plurality of reflective magnetic platelets,
wherein the plurality of reflective magnetic platelets are aligned to exhibit a funnel-shaped reflection in a view without rotating the substrate around an axis,
wherein the plurality of reflective magnetic platelets are aligned to cause a reflective effect in a different view,
wherein the reflective effect comprises a first lateral motion of a first portion of the funnel-shaped reflection, that is larger than a second lateral motion of a second portion of the funnel-shaped reflection, and
wherein the different view is different from the view without rotating the substrate around the axis.
14. The optical article of claim 13 , wherein the axis is a horizontal axis.
15. The optical article of claim 13 , wherein the plurality of reflective magnetic platelets are aligned to further cause a different reflective effect that comprises a widening of a portion of the funnel-shaped reflection.
16. The optical article of claim 15 ,
wherein the portion of the funnel-shaped reflection is a top portion of the funnel-shaped reflection, and
wherein the first portion of the funnel-shaped reflection is the top portion of the funnel-shaped reflection.
17. The optical article of claim 13 , wherein the plurality of reflective magnetic platelets are aligned to further cause a different reflective effect that comprises a narrowing of a portion of the funnel-shaped reflection.
18. The optical article of claim 17 ,
wherein the portion of the funnel-shaped reflection is a bottom portion of the funnel-shaped reflection, and
wherein the second portion of the funnel-shaped reflection is the bottom portion of the funnel-shaped reflection.
19. An article comprising:
a plurality of reflective magnetic platelets,
wherein the plurality of reflective magnetic platelets are aligned to exhibit a funnel-shaped reflection in a first view,
wherein the plurality of reflective magnetic platelets are aligned to cause a reflective effect in a second view, and
wherein the reflective effect comprises a first lateral motion of a first portion of the funnel-shaped reflection that is larger than a second lateral motion of a second portion of the funnel-shaped reflection.
20. The article of claim 19 , wherein the reflective effect appears as an arc-shaped reflection.