Edinburgh Napier University

  A new type of imaging microlens, primarily for use with solid-state image-capture systems such as a charge coupled device (CCD) or metal oxide semiconductor array sensors, is described. The design, having less aberration than conventional lenses of similar specification, is particularly advantageous in wide-angle, low-light applications. The lens type is substantially simpler than any existing design. A particular example, a fixed focus f/3.5 lens with a 90° field of view and a depth of field from 2 cm to infinity, is detailed. The lens can be directly bonded to a solid-state array detector and requires no other mechanical support. The lens can be designed and manufactured at low cost and has current applications in surveillance and microscopy.