Moiré pattern

About: Moiré pattern is a research topic. Over the lifetime, 1917 publications have been published within this topic receiving 27176 citations. The topic is also known as: moiré fringes & moire pattern.

Inside Moire patterns

Abstract: Moire patterns are produced by the interaction of two overlaid patterns. With a little geometry, it is easy to understand where they come from and how to create and control them. To demonstrate Moire effects the author uses a very simple set of patterns: sheets of parallel lines, called gratings.

A novel moiré fringe assisted method for nanoprecision alignment in wafer bonding

Abstract: High precision alignment is essential to 3D integrated circuit and other multilayer structure fabrication. A novel centrosymmetric square moire grating is developed for aligning between the top and bottom wafers. The mismatched moire fringes produced by the two superimposed centrosymmetric square gratings are highly sensitive with the misalignments and misaligned directions without requiring any external reference. Using two pairs of these square moire gratings, misalignments of the bonded wafers are determined in X-Y-θ direction simultaneously on wafer scale. In our experiment, the misalignments in the order of ± 0.5 µm in X-Y direction can be easily identified using a simple infrared (IR) microscope. Moreover, the measurement of misalignments using the moire fringe distances does not depend on the gap between the two wafers changing from tens of micrometers to zero during alignment process. Therefore, these moire gratings are suitable for being secondary alignment mark to achieve high-precision alignment as well. A moire fringe assisted alignment method is proposed for realization of alignment accuracy in nanometer-scale.

Reducing multi-separation color Moiré by a variable undercolor removal and gray component replacement strategy : Color imaging science

Abstract: One common artifact in color printing is the moire caused by the superposition of the different color separations. This problem is well known and a common approach to minimize the moire is the use of rotated halftone dots of precise frequency and angle for the different separations. In low resolution devices, the precise relationship between the different separations is commonly hard to satisfy and compromises have to be made. This paper describes a method to vary the undercolor removal (UCR) and gray component replacement (GCR) schemes employed as a function of the predicted inter-separation moire in order to allow for a better trade-off in the halftone design.

Three-dimensional pattern ornament body

Abstract: PROBLEM TO BE SOLVED: To provide a three-dimensional pattern ornament body capable of three-dimensionally displaying gradation moire patterns (interference stripes) having a fine area and a coarse area. SOLUTION: A pattern 4a colored into a desired color is printed in a pattern Ba on the surface of a transparent or opaque sheet-like ornament body 2 constituting the three-dimensional pattern ornament body 1, a pattern 4b colored different from the pattern 4a is printed in a pattern Bb on the surface of the pattern 4a, and a transparent convex lens 3 having almost a hemispherical shape cross section is printed in a pattern A on the pattern Bb surface of the pattern 4b. The pattern A and the patterns Ba, Bb are displaced or crossed at angles θ1, θ2 where the moire patterns appear, to three-dimensionally display gradation moire patterns wherein the pattern concentration and the color density change between the fine area and coarse area. COPYRIGHT: (C)2005,JPO&NCIPI