Optical observation instrument having a device for...

Details Optical observation instrument having a device for... Optical observation instrument having a device for...

2005-10-11

2009-08-04

Pritchett, Joshua L (Department: 2872)

Optical: systems and elements

Glare or unwanted light reduction

With absorption means

C359S834000

Reexamination Certificate

active

07568808

ABSTRACT:
An optical observation instrument has a device (1) for protecting against incoming flare (40) arranged within the beam path of the instrument. The device contains a filter (22/30) tuned to the flare (40). The filter (22/30) is configured and arranged within the beam path such that the flare (40) transits the filter (22/30) at least two times.

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H. Tsuda et al.; “Polarisation independent tunable liquid-crystal Fabry-Perot Interferometer filter module with double-pass configuration”; May 1995; pp. 828-829.

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