Two mirror scanning relay optics
An optical projection system includes a source of collimated light, a first microelectromechanical system mirror positioned to receive collimated light from the source, and an optical relay system positioned to receive collimated light from the first microelectromechanical system mirror. The optical relay system includes a single-pass relay having a first component, a second component, and a third component. The optical projection system also includes a second microelectromechanical system mirror positioned to receive collimated light from the optical relay system and an eyepiece positioned to receive light reflected from the second microelectromechanical system mirror.
1 . An optical projection system comprising:
a source of collimated light emitting projection light;
a first microelectromechanical system mirror positioned to receive the projection light from the source, the first microelectromechanical system mirror having a first scan axis, and the first microelectromechanical system mirror configured to reflect the projection light from the source along a first range of propagation directions about the first scan axis;
an optical relay system positioned to receive the projection light from the first microelectromechanical system mirror along the first range of propagation directions about the first scan axis and direct reflected the projection light, wherein the optical relay system consisting of, in order of propagation of the projection light, a first mirror, a second mirror, and a third mirror having a different radius of curvature from the first mirror and the second mirror;
a second microelectromechanical system mirror positioned to receive the projection light from the optical relay system, the second microelectromechanical system mirror having a second scan axis oriented perpendicular to the first scan axis, and the second microelectromechanical system mirror configured to reflect the projection light from the optical relay systems at a second range of propagation directions about the second scan axis; and
an eyepiece positioned to receive light reflected from the second microelectromechanical system mirror.
2 . The optical projection system of claim 1 , wherein the eyepiece includes one or more optical components configured to receive and redirect light reflected by the second microelectromechanical system mirror to one or two eyes of a user.
3 . The optical projection system of claim 1 , wherein the first mirror includes a first reflective surface directing and focusing the projection light from the first microelectromechanical system mirror at a second reflective surface of the second mirror.
4 . The optical projection system of claim 1 , wherein the first mirror comprises a concave mirror, the second mirror comprises a convex mirror, and the third mirror comprises a concave mirror.
5 . The optical projection system of claim 4 , wherein the first mirror, the second mirror, and the third mirror comprise one or more cylindrical mirrors.
6 . The optical projection system of claim 4 , wherein the first mirror, the second mirror, and the third mirror comprise one or more one or more toroidal mirrors.
7 . The optical projection system of claim 4 , wherein the first mirror, the second mirror, and the third mirror comprise one or more spherical mirrors.
8 . The optical projection system of claim 4 , wherein the first mirror, the second mirror, and the third mirror comprise one or more one or more aspherical mirrors.
9 . The optical projection system of claim 1 , wherein the first mirror focuses the projection light at the second mirror.
10 . The optical projection system of claim 1 , wherein the optical relay system comprises a cylindrical mirror.
11 . The optical projection system of claim 1 , wherein the optical relay system is disposed in a tilted configuration.
12 . The optical projection system of claim 1 , wherein the optical relay system is characterized by angular magnification greater than or less than unity.
13 . The optical projection system of claim 1 , wherein the projection light reflected from the first microelectromechanical system mirror undergoes at least three reflections in the optical relay system prior to reaching the second microelectromechanical system mirror.
14 . The optical projection system of claim 1 , wherein the first mirror is configured to form a line focus at the second mirror.
15 . The optical projection system of claim 1 , wherein the optical relay system comprises a toroidal mirror or an aspheric mirror.
16 . The optical projection system of claim 1 , wherein the optical relay system comprises an aspheric mirror.
17 . The optical projection system of claim 1 , wherein the first mirror, the second mirror, and the third mirror comprise one or more cylindrical mirrors.
18 . The optical projection system of claim 17 , wherein the first mirror is configured to form a line focus at the second mirror.