R; diffractive optical element defining a spatially low frequency phase transition. The optical
element and the imaging lens define a predetermined pattern formed by spaced-apart Sub …

An imaging arrangement and method for extended the depth of focus are provided. The
imaging arrangement comprises an imaging lens having a certain affective aperture, and an …

(57) ABSTRACT A system for increasing the depth of field and decreasing the wavelength
sensitivity and the effects of misfocus-producing aberrations of the lens of an incoherent …

(57) ABSTRACT A system for increasing the depth of field and decreasing the wavelength
sensitivity and the effects of misfocus producing aberrations of the lens of an incoherent …

US4995714A - Multifocal optical device with novel phase zone plate and method for making -
Google Patents US4995714A - Multifocal optical device with novel phase zone plate and …

A tri-focal diffractive lens defining three foci, for viewing a band of light having a
representative wavelength of λ, including a diffractive surface having a number of optical …

(63) Continuation of application No. 09/603,806, filed on Jun.(List continued on next page.)
26, 2000, now Pat. No. 6,282,011, which is a division of application No. 09/079,687, filed on …

Imaging device and method, the device including receiver optics, a diffractive and focusing
surface, and a pair of diffractive and focusing arrangements, the receiver optics receiving …

According to one aspect of the invention an optical includes means to produce an optical
image to be viewed at an exit pupil by an observer, means to produce an enlarged exit pupil …

This application is a continuation of application Ser. No. 07/280,899 filed Dec. 7, 1988 now
abandoned, which is a continuation-in-part of commonly owned US application Ser. No …