Micro-optic security device with zones of color
A micro-optic security device with zonal color transitions includes a planar array of focusing elements, an image icon layer including a plurality of retaining structures, the plurality of retaining structures defining isolated volumes at a first depth within the image icon layer, a first zone of image icons, the first zone of image icons having a first predefined subset of the plurality of retaining structures, wherein the isolated volumes of retaining structures of the first predefined subset of the plurality of retaining structures contain cured pigmented material of a first color, and a second zone of image icons, the second zone of image icons including a second predefined subset of the plurality of retaining structures, wherein the isolated volumes of retaining structures of the second predefined subset of the plurality of retaining structures contain cured pigmented material of a second color, wherein the second color contrasts with the first color.
1. A method of making a micro-optic security device, the method comprising:
selectively applying a layer of uncured pigmented material of a first color to an image icon layer of a micro-optic security device, the image icon layer comprising a plurality of retaining structures, the plurality of retaining structures defining isolated volumes at a first depth within the image icon layer, wherein the selectively applied layer of uncured pigmented material defines a first zone comprising a subset of retaining structures of the plurality of retaining structures;
scraping the image icon layer such that uncured pigmented material of the first color remains in the retaining structures of the image icon layer at depths equal to or less than the first depth;
selectively curing the uncured pigmented material of the first color by directing a first pattern of light directly at the first zone of the image icon layer to form a first arrangement of image icons; and
removing the uncured pigmented material of the first color,
wherein the first pattern of light is directed directly at the image icon layer, and not through an array of focusing elements.
2. The method of claim 1 , wherein the image icon layer is scraped with a doctor blade.
3. The method of claim 1 , wherein the uncured pigmented material is removed with a spray wash.
4. The method of claim 1 , further comprising:
selectively curing the uncured pigmented material of the first color using a DLP UV projector, an LED projector, or a rasterized projection from a UV laser.
5. The method of claim 1 , further comprising:
applying a layer of uncured pigmented material of a second color to the image icon layer of the micro-optic security device, wherein the second color contrasts with the first color;
scraping the image icon layer; and
curing the uncured pigmented material of the second color.
6. The method of claim 5 , further comprising:
flood curing the uncured pigmented material of the second color.
7. The method of claim 5 , further comprising:
selectively curing the uncured pigmented material of the second color by directing a second pattern of light at a second zone of the image icon layer to form a second arrangement of image icons; and
removing the uncured pigmented material of the second color.
8. The method of claim 7 , further comprising:
applying a layer of uncured pigmented material of a third color to the image icon layer, wherein the third color contrasts with the first color and the second color; and
curing the layer of uncured pigmented material of the third color.