Crease pattern for a Miura fold. The parallelograms of this example have 84° and 96° angles.Animation of the folding and unfolding of a Miura-creased material
The Miura fold (ミウラ折り, Miura-ori) is a method of folding a flat surface such as a sheet of paper into a smaller area. The fold is named for its inventor, Japanese astrophysicist Kōryō Miura.[1]
The crease patterns of the Miura fold form a tessellation of the surface by parallelograms. In one direction, the creases lie along straight lines, with each parallelogram forming the mirror reflection of its neighbor across each crease. In the other direction, the creases zigzag, and each parallelogram is the translation of its neighbor across the crease. Each of the zigzag paths of creases consists solely of mountain folds or of valley folds, with mountains alternating with valleys from one zigzag path to the next. Each of the straight paths of creases alternates between mountain and valley folds.[2]
The Miura fold is related to the Kresling fold, the Yoshimura fold and the Hexagonal fold, and can be framed as a generalization of these folds.[3]
The Miura fold is a form of rigid origami, meaning that the fold can be carried out by a continuous motion in which, at each step, each parallelogram is completely flat. This property allows it to be used to fold surfaces made of rigid materials, making it distinct from the Kresling fold and Yoshimura fold which cannot be rigidly folded and require panel deformations to compress to a compact state.[4] For instance, large solar panel arrays for space satellites in the Japanese space program have been Miura folded before launch and then spread out in space.[5][6] A folded Miura fold can be packed into a compact shape, its thickness reflecting only the thickness of the folded material. Folded material can be unpacked in one motion by pulling on its opposite ends, and likewise folded by pushing the two ends together. In the solar array application, this property reduces the number of motors required to unfold this shape, reducing weight and complexity.
^Forbes, Peter (2006), The Gecko's Foot: How Scientists are Taking a Leaf from Nature's Book, Harper Perennial, pp. 181–195.
^Bain, Ian (1980), "The Miura-Ori map", New Scientist. Reproduced in British Origami, 1981, and online at the British Origami Society web site.
^Reid, Austin (2017), "Geometry and design of origami bellows with tunable response", Physical Review E, 95 (1): 013002, arXiv:1609.01354, Bibcode:2017PhRvE..95a3002R, doi:10.1103/PhysRevE.95.013002, PMID 28208390, S2CID 20057718
^Miura, K. (1985), Method of packaging and deployment of large membranes in space, Tech. Report 618, The Institute of Space and Astronautical Science
^Nishiyama, Yutaka (2012), "Miura folding: Applying origami to space exploration" (PDF), International Journal of Pure and Applied Mathematics, 79 (2): 269–279
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