Small and fast zoom system using micromirror array lens
View Patent ↗The present invention provides a small and fast zoom system using micromirror array lens (MMAL). Thanks to the fast response and compactness of the MMAL as well as absence of the macroscopic mechanical movements of lenses, the zoom system of the present invention fastens the speed of the zooming and reduces the space and weight for the zoom system. Also the present invention provides magnifying the area not on the optical axis and can compensate the aberration of the zoom system.
1. A zoom system comprising one or more micromirror array lenses (MMALs), wherein the MMAL comprises a plurality of micromirrors, wherein the focal length of the MMAL is changed by controlling the translation and/or rotation of each micromirror of the MMAL, and wherein the MMAL compensates for the aberration of the system.
2. The zoom system of claim 1 , wherein the zoom system comprises:
a) a first MMAL comprising a plurality of micromirrors; and
b) a second MMAL comprising a plurality of micromirrors, wherein the second MMAL is optically coupled to the first MMAL;
wherein the first MMAL is closer to the object side of the zoom system, wherein the second MMAL is closer to the image side of the zoom system.
3. The zoom system of claim 2 , wherein the first MMAL is a variator to control magnification of the zoom system by controlling the micromirrors and the second MMAL is a compensator to maintain focus throughout the zoom range by controlling the micromirrors.
4. The zoom system of claim 2 , wherein the first MMAL is a compensator to maintain focus throughout the zoom range by controlling the micromirrors and the second MMAL is a variator to control magnification of the zoom system by controlling the micromirrors.
5. The zoom system of claim 2 , wherein the first MMAL and the second MMAL both control magnification and maintain focus of the zoom system by controlling the micromirrors.
6. The zoom system of claim 2 , wherein the first MMAL and the second MMAL are positioned so that the path of the light reflected by the first MMAL and the second MMAL is not blocked.
7. The zoom system of claim 2 , further comprising a beam splitter positioned between the first MMAL and the second MMAL.
8. The zoom system of claim 2 , further comprising an auxiliary lens or group of lenses, wherein the auxiliary lens or group of lenses comprise a focus lens, an erector lens and/or a relay lens.
9. The zoom system of claim 1 , wherein the zoom system comprises
a) a fixed-focus lens or a group of fixed-focus lenses having mechanical motion; and
b) a MMAL comprising a plurality of micromirrors.
10. The zoom system of claim 9 , wherein the fixed-focus lens or group of fixed-focus lenses having mechanical motion is a variator to control magnification of the zoom system and the MMAL is a compensator to maintain focus throughout the zoom range by controlling the micromirrors.
11. The zoom system of claim 9 , wherein the MMAL is a variator to control magnification of the zoom system by controlling the micromirrors and the fixed-focus lens or a group of fixed-focus lenses having mechanical motion is a compensator to maintain focus throughout the zoom range.
12. The zoom system of claim 9 , wherein the fixed-focus lens or group of fixed-focus lenses having mechanical motion and the MMAL both control magnification and maintain focus of the zoom system by controlling the position of the conventional lens or a group of lenses and/or controlling micromirrors.
13. The zoom system of claim 9 , further comprising an auxiliary lens or group of lenses, wherein the auxiliary lens or group of lenses comprise a focus lens, an erector lens and/or a relay lens.
14. The zoom system of claim 1 , wherein the zoom system comprises
a) a non-MMAL variable focus lens , wherein the focal length of the non-MMAL lens is changed; and
b) a MMAL comprising a plurality of micromirrors, wherein the MMAL is optically coupled to the non-MMAL variable focus lens.
15. The zoom system of claim 14 , wherein the non-MMAL variable focus lens is a variator to control magnification of the zoom system and the MMAL is a compensator to maintain focus throughout the zoom range by controlling the micromirrors.
16. The zoom system of claim 14 , wherein the non-MMAL variable focus lens is a compensator to maintain focus throughout the zoom range and the MMAL is a variator to control magnification of the zoom system by controlling the micromirrors.
17. The zoom system of claim 14 , wherein the non-MMAL variable focus lens and the MMAL both control magnification and maintain focus of the zoom system by controlling the focal length of the variable focus lens and controlling micromirrors.
18. The zoom system of claim 14 , further comprising an auxiliary lens or group of lenses, wherein the auxiliary lens or group of lenses comprise a focus lens, an erector lens and/or a relay lens.
19. The zoom system of claim 1 , wherein the zoom system comprises one MMAL comprising a plurality of micromirrors, wherein the MMAL controls the magnification of the zoom system by controlling the micromirrors, wherein the zoom system has a large depth of focus, whereby a pan focus zoom system is provided.
20. The zoom system of claim 19 , further comprising an auxiliary lens or group of lenses, wherein the auxiliary lens or group of lenses comprise a focus lens, an erector lens and/or a relay lens.
21. The zoom system of claim 1 , wherein the MMAL is tilted in the zoom system so that the normal direction of the MMAL is different from the optical axis of the zoom system.
22. The zoom system of claim 21 , wherein the profile of MMAL is symmetric about an axis which is perpendicular to the normal direction of the MMAL and the tilting axis.
23. The zoom system of claim 1 , wherein the optical axis of MMAL is changed by controlling micromirrors.
24. The zoom system of claim 1 , wherein the aberration is caused by phase errors of light introduced by the medium between an object and its image.
25. The zoom system of claim 1 , wherein the aberration is caused by the zoom system.
26. The zoom system of claim 1 , further comprising extra MMAL or MMALs to compensate for the aberration of the system including chromatic aberration.
27. The zoom system of claim 1 , wherein the MMAL is further controlled to compensate for chromatic aberration by satisfying the same phase condition for each wavelength of Red, Green, and Blue (RGB) or Yellow, Cyan, and Magenta (YCM), respectively, to get a color image.
28. The zoom system of claim 1 , wherein the MMAL is controlled to satisfy phase matching condition at an optimal wavelength to minimize chromatic aberration, wherein the optimal wavelength phase matching is used for getting a color image.
29. The zoom system of claim 1 , further comprising an optical filter or filters for image enhancement.
30. The zoom system of claim 1 , further comprising auxiliary lens or group of lenses, wherein the auxiliary lens or group of lenses comprise a focus lens, an erector lens and/or a relay lens.
31. The zoom system of claim 1 , wherein each micromirror of the MMAL is actuated by electrostatic force.