Multiple image camera and lens system
View Patent ↗A system for simultaneously producing multiple images substantially identical images on multiple separate detector planes is disclosed. A reflective spatially beam-splitting element preferably comprising multiple reflective areas is preferably placed at a location substantially coincident with the pupil or aperture of the system. In non-diffraction limited systems, each area preferably comprises an actual cross section that is circular or has the rotational symmetry (or a multiple thereof) of the number of images to be formed. In diffraction limited systems, all of the areas preferably comprise actual cross sections that have the same shape, size and orientation with respect to the incoming optical beam. Each individual actual cross section may be due to the shape of each area, optionally in combination with a mask. Appropriate selection of filters enables real-time multi-spectral scientific imaging, imaging polarimetry, or high dynamic range imaging (HDRI) for photography and cinematography, even with a moving camera and/or moving subjects.
1. A method for producing multiple diffraction limited images, the method comprising the steps of:
splitting an optical beam into a plurality of images using a plurality of beam-splitting elements, the beam-splitting elements comprising actual cross sections each having substantially the same size, shape, and orientation, wherein at least one beam splitting element is partially masked; and
imaging the images using a plurality of imaging systems;
wherein each imaging system comprises an off-axis curved mirror.
2. The method of claim 1 wherein the splitting step comprise splitting the beam substantially at an aperture stop or pupil of an entire optical system.
3. The method of claim 1 wherein each beam splitting element comprises a reflective element comprising a mirror or a facet of a reflective prism.
4. The method of claim 1 wherein the plurality of images are substantially identical.
5. The method of claim 1 further comprising the step of filtering at least one of the plurality of images through a neutral density filter, a wavelength filter, and/or a polarizing filter.
6. The method of claim 1 wherein distances between the beam-splitting elements and corresponding image planes are different.
7. A diffraction limited system for producing multiple images, the system comprising:
a plurality of beam splitting elements comprising actual cross sections each having substantially the same size, shape, and orientation;
a plurality of imaging systems, each imaging system comprises an off-axis curved mirror; and
a plurality of detectors for imaging a plurality of images.
8. The system of claim 7 wherein said beam splitting elements are disposed substantially at an aperture stop or pupil of the system.
9. The system of claim 7 wherein each of said beam splitting elements is reflective and comprises a mirror or a facet of a prism.
10. The system of claim 7 further comprising at least one mask for masking the beam splitting elements.
11. The system of claim 7 wherein said plurality of images are substantially identical.
12. The system of claim 7 further comprising at least one neutral density filter, wavelength filter, and/or polarizing filter disposed at an afocal or collimated space.
13. The system of claim 7 wherein each distance between a beam-splitting element and a corresponding detector is different.