Collapsible imaging systems having lens arrays
Optics systems presented are arranged as high-performance imagers particularly characterized by their exceptional compactness in view of image quality. A plurality of lens and let's and or doublets are configured to cooperate with related mount systems optimized for compactness. To achieve very high resolution imaging despite somewhat abbreviated compound lens design, these systems include use of lens array elements proximate to an imaging plane. So placed lens array devices may be designed with lens elements which invariably operate on incident wave planes with radial dependence. That is, the focusing strength of lenses from which these lens arrays are comprised may depend upon its distance from system optic axis. This enables an imaging correction function that counters distortion and other undesirable imaging errors typically present in a simplified compound lens systems. When used together and in conjunction with special-purpose collapsing lens mounting systems, an imaging system of very high fidelity and very compact weight size is achieved to great advantage in system when a premium on lens size is necessitated.
1. A collapsible imaging system comprising:
a lens array proximally disposed near an image sensor,
two operational modes having an imaging mode and a storage mode, the imaging mode having a plurality of cooperating lens elements arranged about a common optic axis, and the storage mode having a plurality of cooperating lens elements arranged within a common thin planar volume,
wherein the lens array comprises a plurality of lens elements formed on a singe substrate as lens-let or lenticular lens,
wherein all lens elements of the imaging system are arranged off optical axis when the imaging system is collapsed;
wherein all lens elements form an image when the imaging system is in an imaging mode;
wherein the lens array comprises a plurality of lens elements distributed in two dimensions, a focusing power of the constituent lens elements being dependent upon a distance from the plurality of lens elements to the optical axis; and
wherein the focusing power dependence further comprises a positive focus value for a lens nearest the optical axis and a decreasing focus value for all lens elements as a function of their respective distance from the optical axis, the focusing power approaching zero at the lens array periphery.
2. The collapsible imaging systems of claim 1 further comprises lens elements, each lens element having a polygon shaped surface area.
3. The collapsible imaging systems of claim 2 , wherein the polygon shaped surface area of each lens element being on the order of about 0.5-5 square millimeters.
4. The collapsible imaging systems of claim 2 , further comprising a microlens array, wherein each microlens of the microlens array has a clear aperture of less than about 1 square millimeter.
5. The collapsible imaging systems of claim 1 further comprising a static filter operable for application in an electrical domain, said static filter having design features particularly cooperative with respect to physical optics.
6. The collapsible imaging systems of claim 5 , wherein the lens elements form a Cooke triplet or Cooke triplet like compound lens.