Optical device that produces flicker-like optical effects
An optical device that produces flicker-like optical effects is provided. The inventive 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:
a layer of a cured radiation curable resin,
an arrangement of directionally cured image icons, each directionally cured image icon comprising a region of a directionally cured material of a first color disposed on the layer of the cured radiation curable resin; and
an arrangement of focusing elements, each focusing element configured to focus parallel rays of light at a focal point, the focal point associated with 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 at locations proximate to focal points associated with a first set of cure angles,
wherein the focusing elements project a synthetically magnified image of 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 image icons comprise posts on a surface of the cured radiation curable resin.
3. The optical device of claim 1 , wherein the directionally cured image icons comprise voids in a surface of the cured radiation curable resin.
4. The optical device of claim 1 , wherein the arrangement of focusing elements comprises reflective focusing elements.
5. 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 disposed on the layer of cured radiation curable resin.
6. The optical device of claim 5 , wherein image icons of the second arrangement of directionally cured image icons are disposed at locations proximate to focal points associated with the first set of cure angles.
7. The optical device of claim 5 , wherein image icons of the second arrangement of directionally cured image icons are disposed at locations proximate to focal points associated with cure angles outside of the first set of cure angles.
8. The optical device of claim 1 , further comprising a laser markable layer, the laser markable layer comprising regions of material whose optical properties are altered in response to application of laser light.
9. The optical device of claim 8 , wherein the laser markable layer provides a static, two dimensional image.
10. The optical device of claim 8 , wherein the laser markable layer is disposed below the icon layer.
11. The optical device of claim 8 , wherein the laser markable layer is disposed above the icon layer.
12. The optical device of claim 8 , wherein the regions of material whose optical properties are altered in response to the application of laser light are at locations proximate to focal points associated with cure angles outside of the first set of cure angles.
13. The optical device of claim 1 , wherein a focusing element of the arrangement of focusing elements is an embedded focusing element.