WIDE ANGLE VARIABLE NEUTRAL DENSITY FILTER
A three (or more) polarizer arrangement is used to demonstrate a wide-angle variable-neutral-density (VND) filter that has both contrast uniformity and color uniformity. According to one embodiment, the outer polarizers effectively counter-rotate with respect to a fixed center polarizer as a means o...
Saved in:
Main Authors | , |
---|---|
Format | Patent |
Language | English French German |
Published |
16.08.2023
|
Subjects | |
Online Access | Get full text |
Cover
Loading…
Summary: | A three (or more) polarizer arrangement is used to demonstrate a wide-angle variable-neutral-density (VND) filter that has both contrast uniformity and color uniformity. According to one embodiment, the outer polarizers effectively counter-rotate with respect to a fixed center polarizer as a means of compensating for transmission non-uniformity associated with geometrical polarization distortions experienced by off-normal rays. In particular, the achromatic compensation arrangement enables angle uniformity relative to normal-incidence transmission when the number of stops of attenuation grows large (e.g. 10-stops, or OD3). The filters are useful for cameras or instrumentation allowing mechanical or electromechanical tuning. |
---|---|
Bibliography: | Application Number: EP20230168098 |