| 摘要 |
PROBLEM TO BE SOLVED: To solve the problem in which: when a light guide plate has a difference in angle between areas, a desirable image cannot be formed.SOLUTION: A light guide plate of an optical device comprises first light convergence parts that are provided in a first area, and second light convergence parts that are provided in a second area different from the first area along a light guide direction of the light guide plate; the light convergence parts each include an optical surface that emits, from the emission surface, emission light in a direction to substantially converge to one convergence point or convergence line on a space or substantially emitted from one convergence point or convergence line on a space; the light convergence parts have different convergence points or convergence lines from each other; the plurality of convergence points or convergence lines in the first light convergence parts are gathered to form a first image on the space, and the plurality of convergence points or convergence lines in the second light convergence parts are gathered to form a second image on the space; when the images are projected on a surface parallel to the light guide direction of the light guide plate and perpendicular to the emission surface, the first light convergence parts each emit emission light to the emission surface at a first angle, and the second light convergence parts each emit emission light to the emission surface at a second angle.SELECTED DRAWING: Figure 2 |
