OPTICAL ELEMENT AND HEADS-UP DISPLAY

摘要

An optical element that reflects the light forming a display image, thereby enabling the display image to be viewed as a virtual image. In this optical element, a plurality of half-mirrors having a Fresnel structure are formed within a single flat plate. At least one of the plurality of half-mirrors employs a Fresnel structure wherein the center of the free-form surface that is the basis of the Fresnel structure is not positioned at the center of that half-mirror. Thus, it is possible to suitably form a plurality of eyeboxes at different locations by means of one optical element.