Adjusting contrast in an optical system

Details Adjusting contrast in an optical system Adjusting contrast in an optical system

2006-06-13

2006-06-13

Robinson, Mark A. (Department: 2872)

Optical: systems and elements

Extended spacing structure for optical elements

Extension of tubular element adjustable

C353S010000, C353S020000, C040S434000

Reexamination Certificate

active

07061680

ABSTRACT:
An improved object projection system provides an observer with a surrounding background that has adjustable contrast levels relative to an object. A transmissive polarizer and a reflective polarizer change relative orientations. The change in orientation causes the level of light passing through the transmissive polarizer to change. In one system, the transmissive polarizer is placed in front of an object. A light source is placed in front of the object and behind the transmissive polarizer. A reflective polarizer is placed behind the object. The reflective polarizer provides the surrounding background for the object. A light source illuminates the object and the reflective polarizer. The object emits reflected light, which travels through the transmissive polarizer. Light from the reflective polarizer is transmitted to the transmissive polarizer. The level of light transmitted depends on the orientation of a transmissive axis of the transmissive polarizer to a reflective axis of the reflective polarizer.

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