Optical device for augmented reality having ghost image prevention function

Abstract

Provided is an optical device for augmented reality having a ghost image prevention function. The optical device includes: an image output unit to output virtual image light; an optical unit configured such that the virtual image light propagates through an inside thereof and real object image light is transmitted therethrough toward a pupil; a first optical element inside the optical unit to transfer the virtual image light to a plurality of second optical elements; and the second optical elements disposed inside the optical unit, and configured to provide a virtual image to the user by transferring the virtual image light toward the user's pupil. The optical unit has a first, a second, and a third surfaces. The third surface has an inclination angle to a normal line in a forward direction from the user's pupil and the image output unit is spaced apart from the third surface.