Illumination obscurement device

Details Illumination obscurement device Illumination obscurement device

2007-09-28

2009-08-11

Choi, Jacob Y (Department: 2885)

Illumination

Light modifier

Adjustable or positionable

C362S143000, C362S321000, C250S201900, C359S316000, C359S318000, C359S320000, C359S385000, C359S387000, C359S389000, C359S900000

Reexamination Certificate

active

07572035

ABSTRACT:
An illumination obscurement device for controlling the obscurement of illumination from a light source which is optimized for use with a rectangular, arrayed, selective reflection device. In a preferred embodiment, a rotatable shutter with three positions is placed between a light source and a DMD. The first position of the shutter is a mask, preferably an out of focus circle. This out of focus circle creates a circular mask and changes any unwanted dim reflection to a circular shape. The second position of the shutter is completely open, allowing substantially all the light to pass. The third position of the shutter is completely closed, blocking substantially all the light from passing. By controlling the penumbra illumination surrounding the desired illumination, DMDs can be used in illumination devices without creating undesirable rectangular penumbras.

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