Realization of moiré imaging by flat micro lens array

Abstract

Micro-focusing moire imaging has found successful application in security and anti-counterfeiting. It comprises of a micro-lens array and a micro-pattern array to visually present impressive dynamic and stereoscopic visual effects. In this paper a moire imaging device with new features is fabricated using the well-known techniques such as nanoimprinting and photoresist thermal reflow. The features of the moire imaging device benefit from the novel configuration of the micro lens array. With the same aperture diameter , the Flat Micro Lens Array can realize moire imaging on thicker substrate, which has better dynamic effect, compared to the moire image achieved by the traditional microlens array. The working surface of the MLA is buried in the UV layer, and the microlens moire device is not easily replicated. The Flat Micro Lens Array surface is flat, hard to worn, even if be worn does not affect the imaging quality. Due to the above features, the proposed moire device has application in the field of anti-counterfeiting.