Optical shield with graduated conical baffles
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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-
Feb 15, 2000
Grant Date -
N/A
app pub date -
Oct 16, 1998
filing date -
Oct 16, 1998
priority date (Note) -
Expired
status (Latency Note)
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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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