Radiant energy – Photocells; circuits and apparatus – With circuit for evaluating a web – strand – strip – or sheet
Reexamination Certificate
2005-02-22
2005-02-22
Porta, David (Department: 2878)
Radiant energy
Photocells; circuits and apparatus
With circuit for evaluating a web, strand, strip, or sheet
C356S237200
Reexamination Certificate
active
06858859
ABSTRACT:
An optically scanning apparatus and defect inspection system able to detect a defect with a high resolution and able to greatly shorten the inspection time. An radiation beam generated from a light source is converted to a light beam array of an m×n matrix by a two-dimensional diffraction grating. The light beams of the light beam array are focused into micro spots by an objective lens and projected on a sample. Therefore, a two-dimensional light spot array of an m×n matrix is formed on a sample. The sample stage rotates and moves rectilinearly in an r direction, so the sample surface is scanned by the m×n matrix of light spots. As a result, the sample surface is spirally scanned by a light beam of a belt shape of the scan width, so can be scanned at a high speed. Further, the beams reflected by the sample surface are received by light receiving elements separated by light blocking members, so a confocal optical system is formed and as a result the resolution of detection of defects becomes much higher.
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patent: 6043932 (2000-03-01), Kusunose
patent: 6208411 (2001-03-01), Vaez-Iravani
patent: 6433876 (2002-08-01), Kuhn
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Lasertec Corporation
Lee Patrick J.
Porta David
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