Dark field lighting testing device
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United States of America Patent
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Apr 20, 2010
Issued Date -
N/A
app pub date -
Jul 30, 2007
filing date -
Jul 30, 2007
priority date (Note) -
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Abstract
A dark field lighting testing device, for detecting a surface defect of an object having mirror surfaces, includes a cavity, the interior surface of which is made of a light-absorbing material; an opening arranged on a top of the cavity; a tape body arranged on the interior surface of the cavity; a plurality of lighting elements arranged on the tape body and electrically connected to each other; and a plate body arranged right above the opening of the cavity. During testing procedure, light emitted from each lighting element is incident upon the surface of the tested object, from which the diffusively reflected or refracted light forms an image on the surface of the plate body, thus a defect on the surface of the tested body and a position thereof being able to be detected.
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