Diffractive optical element and camera

Abstract

A diffractive optical element and a camera are disclosed. The diffractive optical element may be arranged at a camera head of a camera for assisting the camera in imaging. The diffractive optical element may be configured by inverse design. The diffractive optical element is inversely designed to minimize stray spots during image capture and to enhance its light transmission capability. The inverse design is applied to reduce an etching depth of a patterned region in the diffractive optical element, thereby lowering primary and secondary diffraction efficiency, increasing light transmission capacity, and minimizing stray spots in captured images. The inverse design is further applied to narrow the patterned region in the diffractive optical element, thereby lowering diffraction efficiency and increasing light intake through a light transmissive region, which enables a camera aperture to obtain more light, enhancing background light intake, shutter response speed, and overall quality in imaged background.

Dependencies are inferred from the claim text.