Optical shield with graduated conical baffles

Details Optical shield with graduated conical baffles Optical shield with graduated conical baffles

1998-10-16

2000-02-15

Nguyen, Thong

Optical: systems and elements

Glare or unwanted light reduction

Directional or angular discrimination

359399, 359601, 359611, G02B 2700, G02B 2100

Patent

active

060244585

ABSTRACT:
An optical shield for preventing stray light from reaching the focal plane of an optical device includes a tubular housing defining an aperture at one end for admitting light to pass through the housing to the focal plane, and a plurality of annular conical baffles attached to the housing wall and axially spaced along the housing between the aperture and the focal plane. In one embodiment, the housing wall is conical and the baffles are all aimed at a location on the housing wall which is between the aperture and a forwardmost one of the baffles adjacent the aperture, such that the rearward-facing surfaces of the baffles are shielded from direct and reflected light. The baffles are spaced sufficiently closely and are long enough that the baffles shield the focal plane from those portions of the housing wall that are directly illuminable by light passing through the aperture.

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