Micro-optic device
The present invention relates to a micro-optic device for use in a micro-optic image presentation system. Specifically, the micro-optic device is formed as a single layer unitary structure arranged to generate various complex imagery effects.
1 . A micro-optic device, comprising:
a substrate including a first surface and a second surface;
optical elements; and
image elements, wherein the optical elements and the image elements are integrally formed as a unitary structure located on the first or the second surface of the substrate, and
a reflective layer, provided between at least one of (i) the substrate and the unitary structure or (ii) the unitary structure and an observer as a translucent coating over the optical elements and the image elements;
wherein the image elements are arranged to be sampled by the optical elements with the reflective layer to form a focusing structure configured to produce a first optical effect observable from the first surface of the substrate, and the same image elements are arranged to be sampled by the optical elements with the reflective layer to form the focusing structure configured to produce a second optical effect observable from the second surface of the substrate.
2 . The micro-optic device of claim 1 , wherein the first and second optical effects are observable in both transmission and reflection from each surface of the substrate.
3 . The micro-optic device of claim 1 , wherein both the first optical effect and the second optical effect are optically variable effects.
4 . The micro-optic device of claim 1 , wherein the first optical effect and the second optical effect are different optical variable effects.
5 . The micro-optic device of claim 1 , wherein both the first and the second optical effects are moire magnification effects or integral image effects.
6 . The micro-optic device of claim 5 , wherein a perceived depth effect of the moire magnification effects or integral image effects is inverted when the micro-optic device is viewed from opposite side of the substrate.
7 . The micro-optic device of claim 5 , wherein a perceived depth effect of the moire magnification effects is inverted when the micro-optic device is viewed in reflection, but not in transmission.
8 . The micro-optic device of claim 1 , wherein the image elements are associated with a plurality of interlaced images, or moire images, or integral images.
9 . The micro-optic device of claim 8 , wherein the image elements are associated with interlaced images which represent an animation, such that micro-optic device displays an animation effect when the device is viewed at successive angles.
10 . The micro-optic device of claim 9 , wherein the image elements are associated with interlaced images which represent a 3-dimensional (3D) appearance of an object or a scene, such that the micro-optic device produces a 3D effect.
11 . The micro-optic device of claim 1 , wherein the image elements are formed as fixed size image pixels, wherein the image pixels are of a square or a rectangular shape of approximately 10 microns and are recessed into or protruding from the surface of the optical elements.
12 . The micro-optic device of claim 11 , wherein the image elements are associated with two interlaced images and the micro-optic device produces an image flipping effect of the interlaced images.
13 . The micro-optic device of claim 12 , wherein each image element includes an array of dots, and the image elements that represent the first interlaced image are substantially located on a left side of their corresponding optical elements, and the image elements that represent a second image are substantially located on a right side of their corresponding optical elements.
14 . The micro-optic device of claim 1 , wherein the optical elements include a one-dimensional array of part cylindrical lenses, and the image elements are offset with respect to a lens axis, wherein an offset distance is a function of an input greyscale value derived from an input greyscale image.
15 . The micro-optic device of claim 1 , wherein the optical elements include part concave and part convex lenses.
16 . The micro-optic device of claim 1 , wherein the image elements are entirely formed in surfaces of the optical elements; or partially formed in surfaces of the optical elements, and partially located in spaces between adjacent optical elements; or some of the image elements may be formed in surfaces of the optical elements, and some may be located in spaces between adjacent optical elements.
17 . The micro-optic device according of claim 16 , wherein the image elements are formed such that they occupy not more than 50% of the surface area of the optical elements.
18 . The micro-optic device of claim 1 , wherein the image elements are either recessed into surfaces of the optical elements or spaces between adjacent optical elements, or formed as protrusions which protrude from the surfaces of the optical elements or the spaces between adjacent optical elements, wherein the image elements protruding or recessed distance is less than the maximum depth or maximum height of the optical elements.
19 . The micro-optic device of claim 18 , wherein the protruding or recessed distance is less than 7 microns.
20 . The micro-optic device of claim 1 , wherein the reflective layer is provided to enhance visibility of the optical effect(s).