Nalux Co., Ltd.

Makio Nishimaki

Daisuke Seki

Kazuya Yamamoto

Masato Okano

A diffusion element is configured by combining: a structure for diffusion constituted by combining periodic surface structures having multiple periods to achieve a light intensity distribution in which the light intensity is uniform at angles less than or equal to a predetermined diffusion angle &#x3b8; and the light intensity is as close as possible to zero intensity at angles greater than the diffusion angle &#x3b8;; and a diffractive structure having a period of 1 or more and 2 or less times of &#x39b;max, where &#x39b;max is the maximum period of the structure for diffusion.

Diffuser

A diffuser is provided with a recess-protrusion structure formed on a plane. When a z-axis is defined as a normal to the plane, an x-axis is defined on the plane, the x-axis is divided into plural intervals, Snx represents length of an interval nx, Sx-max and Sx-min represent the maximum and the minimum of Snx, respectively, the relationship2&#x3c;-max/-minholds, Snx varies on a random basis between Sx-min and Sx-max, in an xz cross section, a recess portion and a protrusion portion are formed on each of adjacent intervals along the x-axis, respectively, and when dznx represents a difference between the maximum and the minimum of z coordinate of the recess-protrusion structure in the interval nx in the xz cross section, Anx represents a ratio between dznx and Snx, Anx-max and Anx-min represent the maximum and the minimum of Anx, the relationship-max/-min&#x3c;1.3holds.

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Osaka, Japan

Makio Nishimaki