OPTICAL DEVICE, OPTICAL SYSTEM, AND TICKET GATE

摘要

An optical device that has a light-guiding plate that is provided with: first light-convergence parts that are provided in a first region; and second light-guiding parts that are provided along the light-guidance direction of the light-guiding plate in a second region that is different from the first region. The light-convergence parts have respective optical surfaces that cause emission light to be emitted from an emission surface in directions that substantially converge at a convergence point in space or in a convergence line or that substantially diverge from a convergence point in space or from a convergence line. The light-convergence parts have different convergence points or convergence lines. A first image is formed in space from the aggregation of a plurality of convergence points or convergence lines formed by the first light-convergence parts, and a second image is formed in space from the aggregation of a plurality of convergence points or convergence lines formed by a plurality of the second light-convergence parts. When light that is parallel to the light-guidance direction of the light-guiding plate is being projected onto a surface that is orthogonal to the emission surface, the first light-convergence parts are causing emission light to be emitted at a first angle to the emission surface, and the second light-convergence parts are causing emission light to be emitted at a second angle to the emission surface.