Scanning optical devices and systems
In general, in one aspect, the invention features an optical system which forms a light field by providing components of the light field in a series of frames to an image space. The optical system includes a spatial light modulator, a projection lens assembly configured to image the spatial light modulator to the image space for each of a plurality of optical paths, and a scanning optical component configured to direct light from the spatial light modulator through the projection lens to the image space, wherein during operation the scanning optical component directs light corresponding to successive frames along each of the plurality of optical paths through the projection lens assembly.
1 . An optical system which forms a light field by providing components of the light field in a series of frames to an image space, the optical system comprising:
a spatial light modulator;
a projection lens assembly configured to image the spatial light modulator to the image space for each of a plurality of optical paths; and
a scanning optical component configured to direct light from the spatial light modulator through the projection lens to the image space,
wherein during operation the scanning optical component directs light corresponding to successive frames along each of the plurality of optical paths through the projection lens assembly.
2 . The optical system of claim 1 , wherein the different optical paths correspond to different orientations of the scanning optical component with respect to the spatial light modulator.
3 . The optical system of claim 1 , wherein the light field corresponds to a three-dimensional image.
4 . The optical system of claim 1 , further comprising an optical relay which images the spatial light modulator to an intermediate image surface.
5 . The optical system of claim 4 , wherein the scanning optical component is coincident with the intermediate image surface.
6 . The optical system of claim 4 , wherein the scanning optical component is located at a pupil of the projection lens assembly.
7 . The optical system of claim 1 , wherein the scanning optical component is a reflective scanning optical component.
8 . The optical system of claim 1 , wherein the scanning optical component is a transmissive scanning optical component.
9 . The optical system of claim 1 , wherein the scanning optical component comprises at least two scanners configured to scan in orthogonal directions.
10 . The optical system of claim 1 , wherein the projection lens assembly comprises a plurality of lenses.
11 . The optical system of claim 1 , wherein the projection lens assembly comprises an aspheric lens.
12 . The optical system of claim 1 , wherein the scanning optical component comprises a mirror mounted on a galvanometer.
13 . The optical system of claim 1 , further comprising a spatial filter configured to filter light from the spatial light modulator prior to the optical scanning directing the light to the projection lens.
14 . The optical system of claim 1 , further comprising a diffusing screen located at the image space.
15 . The optical system of claim 14 , wherein the scanning optic scans the light along different paths in a horizontal plane and the diffusing screen scatters incident light in a vertical direction.
16 . The optical system of claim 1 , wherein the spatial light modulator is a zero-dimensional spatial light modulator.
17 . The optical system of claim 1 , wherein the spatial light modulator is a one-dimensional spatial light modulator.
18 . The optical system of claim 1 , wherein the spatial light modulator is a two-dimensional spatial light modulator.
19 . The optical system of claim 1 , wherein the spatial light modulator is an emissive spatial light modulator.
20 . The optical system of claim 1 , wherein the spatial light modulator is a reflective spatial light modulator.
21 . The optical system of claim 20 , wherein the spatial light modulator is a micro electromechanical device.
22 . The optical system of claim 20 , further comprising a light source configured to direct light to reflect from the spatial light modulator.
23 . The optical system of claim 22 , wherein the light source is a laser.
24 . An optical system which forms a three-dimensional image by providing components of the three-dimensional image in a series of frames to an image space, the optical system comprising:
a spatial light modulator;
a projection lens assembly configured to image the spatial light modulator to the image space for each of a plurality of optical paths; and
a scanning optical component configured to direct light from the spatial light modulator through the projection lens to the image space,
wherein during operation the scanning optical component directs light corresponding to successive frames along each of the plurality of optical paths through the projection lens assembly.
25 . An optical system which forms a light field by providing components of the light field in a series of frames to an image space, the optical system comprising:
a spatial light modulator;
a diffusing screen positioned in the image space; and
a scanning optical component configured to direct light from the spatial light modulator to the image space,
wherein during operation the scanning optical component directs light corresponding to successive frames along different optical paths in a horizontal plane to the diffusing screen and the diffusing screen scatters incident light in a vertical direction.
26 . An optical system which forms a light field by providing components of the light field in a series of frames to an image space, the optical system comprising:
a spatial light modulator;
a projection lens assembly comprising an aspheric lens; and
a scanning optical component configured to direct light from the spatial light modulator through the projection lens assembly to the image space,
wherein during operation the scanning optical component directs light corresponding to successive frames along different optical paths through the projection lens assembly to form the light field at the image space.
27 . The optical system of claim 26 , wherein the projection lens assembly images the spatial light modulator to the image space for each of the different optical paths.
28 . An optical system which forms a light field by providing components of the light field in a series of frames to a primary image space, the optical system comprising:
a spatial light modulator which is imaged by the optical system to an intermediate image space;
a projection lens assembly configured to image the spatial light modulator to the primary image space; and
a scanning optical component coincident with the intermediate image space and configured to direct light from the spatial light modulator through the projection lens,
wherein during operation the scanning optical component directs light corresponding to successive frames along different paths through the projection lens assembly.