An optical device for augmented reality having a reflective means arranged in a straight line, the optical device comprising:
- a reflective means configured to transfer augmented reality image light, output from an image output unit, to a pupil of a user's eye by reflecting the augmented reality image light toward the pupil, thereby providing an image for augmented reality to the user;
- and
- an optical means configured such that the reflective means is buried and disposed therein, and also configured to transmit at least part of real object image light, output from a real object, therethrough toward the pupil of the user's eye;
- wherein the optical means has a first surface through which the augmented reality image light reflected from the reflective means and the at least part of the real object image light are output toward the user's pupil, and a second surface which is opposite to the first surface and the real object image light enters;
- wherein the reflective means includes a plurality of reflective units buried and disposed inside the optical means;
- wherein the reflective means includes a plurality of reflective means, and the plurality of reflective means are arranged in parallel at intervals along a direction of the z-axis;
- wherein, when the optical means is placed in front of the user's pupil and a forward direction from the pupil is set as an x axis, the image output unit is disposed outside or inside the optical means to be located on a straight line orthogonal to the x axis;
- and
- wherein, when any one of line segments passing between the first and second surfaces of the optical means while being parallel to a vertical line extending from the image output unit to the x axis along the x axis is set as a y axis and a line segment orthogonal to the x axis and the y axis is set as a z axis:
- at least two of the plurality of reflective units form a first reflective unit group disposed inside the optical means so that centers thereof are located on a first straight line when the optical means is viewed from an outside toward a plane perpendicular to the z axis;
- at least two of remaining reflective units excluding the reflective units forming the first reflective unit group among the plurality of reflective units form a second reflective unit group disposed inside the optical means so that centers thereof are located on a second straight line that is not parallel to the first straight line when the optical means is viewed from an outside toward a plane perpendicular to the z axis;
- and
- the reflective units forming the first reflective unit group are disposed inside the optical means to be located closer to the second surface of the optical means as a distance from the image output unit increases.