Oji Holdings Corporation

Keiichi Kajita

Kei Shinotsuka

Kotaro Dai

Koki Hongo

An optical element including, on a substrate, an anti-reflection layer on multiple small concave protrusions, which have a modal pitch less than or equal to a wavelength of light in an environment where the optical element is to be used, are formed; in which 80% or more of the concave protrusions include one or more steps, and satisfy the following conditions: 0.12d&#x2264;w&#x2264;0.17d and 0.42h&#x2264;z&#x2264;0.52h, in which d is a diameter of the concave protrusions, h is a depth of the concave protrusions, wis a total width of the steps in any cut surface; and zis an average depth of the steps.

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Tokyo, Japan

Keiichi Kajita