Optical device that produces flicker-like optical effects
An optical device that produces flicker-like optical effects is provided. The optical device employs directionally cured image icons. Specifically, the optical device is made up of at least one arrangement of image icons formed from one or more cured pigmented materials, and at least one arrangement of optionally embedded focusing elements positioned to form one or more synthetic images of at least a portion of the arrangement(s) of image icons. Some or all of the pigmented material(s) is cured using collimated light directed through the focusing elements toward the arrangement(s) of image icons at one or more angles relative to a surface of the optical device to form directionally cured image icons. The synthetic image(s) of the directionally cured image icons is viewable at the cure angle(s) and therefore visually appears and disappears, or turns on and off, as the viewing angle of the device moves through the cure angle(s).
1. An optical device comprising:
an icon layer comprising:
an arrangement of directionally cured image icons, each directionally cured image icon comprising a region of a directionally cured material of a first color; and
an arrangement of focusing elements, each focusing element configured to focus parallel rays of light at a focal point, wherein a spatial location of the focal point is dependent on an angle at which parallel rays of light impinge a surface of the focusing element,
wherein some of the directionally cured image icons are disposed proximate to focal points at locations dependent on a first set of cure angles,
wherein the focusing elements project a synthetically magnified image of at least part of the directionally cured image icons at viewing angles within the first set of cure angles, and
wherein a scale ratio between the arrangement of focusing elements and the arrangement of directionally cured image icons has a value substantially equal to 1.0000.
2. The optical device of claim 1 , wherein the directionally cured material of the first color is a fluorescent pigmented material.
3. The optical device of claim 1 , wherein the directionally cured material of the first color is a non-fluorescent pigmented material.
4. The optical device of claim 1 , wherein the icon layer further comprises:
a second arrangement of directionally cured image icons, each image icon of the second arrangement of directionally cured image icons comprising a region of directionally cured material of a second color,
wherein the directionally cured material of the first color is a fluorescent pigmented material, and
wherein the directionally cured material of the second color is a non-fluorescent pigmented material.
5. The optical device of claim 4 , wherein a synthetically magnified image of image icons of directionally cured material of the first color is only visible within the first set of cure angles.
6. The optical device of claim 4 , wherein the synthetically magnified image of at least part of the image icons of directionally cured material of the first color is machine readable within the first set of cure angles.
7. The optical device of claim 6 , wherein the synthetically magnified image of at least part of the image icons of directionally cured material of the first color is machine readable only within the first set of cure angles.
8. The optical device of claim 1 , wherein the directionally cured image icons comprise coated voids in a surface of a cured radiation curable resin layer.
9. The optical device of claim 8 , wherein the coated voids are machine readable.
10. The optical device of claim 9 , wherein the coated voids are machine readable within the first set of cure angles.