| 摘要 |
A method of optical element manufacturing, the method may include selecting a range of a misfocus parameter psi; and designing the optical element to include multiple regions, wherein the optical transfer function (OTF) of the optical element allows, for the range of the misfocus parameter .psi., transmission of images with a contrast of at least 10% for all normalized spatial frequencies up to 50% of a theoretical maximum that is attainable with a full aperture in an in-focus condition.
|
