Compact optical device for augmented reality having straightly-arranged optical structure, and method for manufacturing optical means
The present invention provides a compact optical device for augmented reality, the compact optical device including: an optical means configured to transmit at least part of real object image light therethrough toward the pupil of a user's eye; a first reflective means embedded and disposed inside the optical means, and configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, to a second reflective means; and the second reflective means including a plurality of reflective units embedded and disposed in the optical means to transfer the augmented reality image light, transferred from the first reflective means, to the pupil of the user's eye by reflecting the augmented reality image light toward the pupil; wherein the optical means has first and second surfaces, and a method for manufacturing an optical means used in the same.
1 . A compact optical device for augmented reality having a straightly-arranged optical structure, the compact optical device comprising:
an optical means configured to transmit at least part of real object image light therethrough toward a pupil of a user's eye;
a first reflective means embedded and disposed inside the optical means, and configured to transfer augmented reality image light, which is image light corresponding to an image for augmented reality output from an image output unit, to a second reflective means; and
the second reflective means including a plurality of reflective units embedded and disposed in the optical means to transfer the augmented reality image light, transferred from the first reflective means, to the pupil of the user's eye by reflecting the augmented reality image light toward the pupil;
wherein the optical means has a first surface on which real object image light is incident, and a second surface through which the augmented reality image light transferred through the second reflective means and the real object image light are output toward the pupil of the user's eye;
wherein the second reflective means includes a plurality of reflective units having a size of 4 mm or less that are embedded and disposed inside the optical means;
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;
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 part increases; and
the first reflective unit group is arranged to be positioned closer to the first reflective means than the second reflective unit group.
2 . The compact optical device of claim 1 , wherein the reflective units constituting the second reflective unit group have a same distance to the second surface of the optical means regardless of a distance from the first reflective means.
3 . The compact optical device of claim 1 , wherein the reflective units constituting the second reflective unit group are disposed farther from the second surface of the optical means as a distance from the first reflective means increases.
4 . The compact optical device of claim 1 , wherein the first straight line and the second straight line are included in any one plane perpendicular to the z axis.
5 . The compact optical device of claim 1 , wherein the augmented reality image light output from the image output unit is directly transferred to the first reflective means through an inside of the optical means, or is reflected by total internal reflection on an inner surface of the optical means at least once and then transferred to the first reflective means.
6 . The compact optical device of claim 1 , wherein the first reflective means directly transfers the augmented reality image light to the second reflective means, or transfers the augmented reality image light to the second reflective means after the augmented reality image light has been reflected by total internal reflection on an inner surface of the optical means at least once.
7 . The compact optical device of claim 1 , wherein a reflective surface of the first reflective means that reflects the augmented reality image light is disposed to face the first surface of the optical means on which the real object image light is incident.
8 . The compact optical device of claim 1 , wherein a reflective surface of the first reflective means is formed as a curved surface formed to be concave toward the first surface of the optical means.
9 . The compact optical device of claim 8 , wherein the first reflective means is formed to extend closer to the second reflective means in directions from a central portion thereof toward both left and right ends thereof when the optical means is viewed from the pupil toward a forward direction.
10 . The compact optical device of claim 1 , wherein a length of the first reflective means in a widthwise direction is 4 mm or less.
11 . The compact optical device of claim 1 , wherein the second reflective means includes a plurality of second reflective means, and the plurality of second reflective means are arranged in parallel at intervals along a direction of the z-axis.
12 . The compact optical device of claim 11 , wherein there is present at least one second reflective means that is disposed such that distances between the individual reflective means and the second surface of the optical means are not all the same.
13 . The compact optical device of claim 11 , wherein each of the second reflective means is arranged such that each of the reflective units constituting each of the second reflective means is positioned together with any one of reflective units constituting an adjacent second reflective means along an imaginary straight line parallel to the z axis.
14 . The compact optical device of claim 11 , wherein each of the second reflective means is arranged such that each of reflective units constituting each of the second reflective means is not positioned together with all reflective units constituting an adjacent second reflective mean along an imaginary straight line parallel to the z axis.
15 . The compact optical device of claim 1 , wherein the plurality of reflective units are formed in bar shapes extending along imaginary straight lines parallel to the z axis.
16 . The compact optical device of claim 1 , wherein the first reflective means is formed to extend closer to the second reflective means in directions from a central portion thereof toward both left and right ends thereof when the optical means is viewed from a plane perpendicular to the x axis.
17 . The compact optical device of claim 1 , wherein a third surface through which the augmented reality image light output from the image output unit is incident on the optical means is formed as a curved surface to have refractive power.
18 . The compact optical device of claim 17 , wherein an auxiliary optical means is disposed between the image output unit and the third surface.
19 . The compact optical device of claim 1 , wherein at least some of the plurality of reflective units are each formed of a half mirror or a refractive element.
20 . The compact optical device of claim 1 , wherein at least some of the plurality of reflective units are each coated with a material absorbing light without reflecting light on a surface thereof opposite to a surface thereof that reflects the augmented reality image light.
21 . The compact optical device of claim 1 , wherein surfaces of at least some of the plurality of reflective units are each formed as a curved surface.
22 . The compact optical device of claim 1 , wherein at least some of the plurality of reflective units are each formed of a diffractive optical element (DOE) or a holographic optical element (HOE).
23 . A method for manufacturing the optical means of claim 1 , the method comprising:
a first step of forming reflective units on a surface of a lower base substrate along a first direction;
a second step of forming reflective units on a surface of each of a plurality of first substrates along a direction parallel to the first direction, and forming reflective units on a surface of each of a plurality of second substrates along a direction parallel to the first direction;
a third step of sequentially bonding and stacking the plurality of first substrates on the surface of the lower base substrate;
a fourth step of, after the third step, forming a second reflective means by sequentially bonding and stacking the plurality of second substrates on an uppermost one of the first substrates;
a fifth step of forming an optical means base material by bonding and stacking an upper base substrate including a first reflective means on an uppermost one of the second substrates; and
a sixth step of forming the optical means by processing the optical means base material;
wherein the second step includes forming reflective units on a surface of each of the first and second substrates so that a line connecting centers of reflective units formed on surfaces of the respective first substrates forms a straight line and a line connecting centers of reflective units formed on surfaces of the respective second substrates forms a straight line when the first and second substrates are viewed from an outside toward a plane perpendicular to the first direction;
wherein the straight line connecting the centers of the reflective units formed on the first substrates and the straight line connecting the centers of the reflective units formed on the second substrates are not parallel to each other; and
wherein the sixth step includes forming the optical means by cutting the optical means base material in directions parallel to the first direction along two parallel straight lines that allow the reflective units to be all included therebetween when the optical means base material is viewed toward a plane perpendicular to the first direction.
24 . The method of claim 23 , wherein the plurality of first substrates have a same shape, the plurality of second substrates have a same shape, and the plurality of first substrates and the plurality of second substrates have different shapes.
25 . The method of claim 24 , wherein, when the optical means base material is viewed toward a plane perpendicular to the first direction, a height of any one of both ends of the plurality of first substrates and both ends of the plurality of second substrates is higher than that of a remaining end.
26 . A method for manufacturing the optical means of claim 1 , the method comprising:
a first step of forming reflective units on a surface of a lower base substrate along a first direction;
a second step of sequentially bonding and stacking a plurality of first substrates on the surface of the lower base substrate, and forming reflective units on a surface of each of the plurality of first substrates along a direction parallel to the first direction;
a third step of, after the second step, sequentially bonding and stacking a plurality of second substrates on an uppermost one of the first substrates, and forming reflective units on a surface of each of the plurality of second substrates along a direction parallel to the first direction, thereby constructing a second reflective means;
a fourth step of forming an optical means base material by bonding and stacking an upper base substrate, including a first reflective means, on an uppermost one of the second substrates; and
a fifth step of forming an optical means by processing the optical means base material;
wherein the second step includes forming reflective units on a surface of each of the first substrates so that a line connecting centers of reflective units formed on surfaces of the respective first substrates forms a straight line when the first substrates are viewed from an outside toward a plane perpendicular to the first direction;
wherein the third step includes forming reflective units on a surface of each of the second substrates so that a line connecting centers of reflective units formed on surfaces of the respectively second substrates form a straight line when the second substrates are viewed from an outside toward a plane perpendicular to the first direction;
wherein the straight line connecting the centers of the reflective units formed on the first substrates and the straight line connecting the centers of the reflective units formed on the second substrates are not parallel to each other; and
wherein the fifth step includes cutting the optical means base material in directions parallel to the first direction along two parallel straight lines that allow the reflective units to be all included therebetween when the optical means base material is viewed toward a plane perpendicular to the first direction.