Optical member inspection apparatus

Details Optical member inspection apparatus Optical member inspection apparatus

1998-03-05

2000-03-07

Font, Frank G.

Optics: measuring and testing

Inspection of flaws or impurities

Transparent or translucent material

3562392, 356124, G01N 2100, G01B 900

Patent

active

06034766&

ABSTRACT:
An optical member inspection apparatus is disclosed. A light shielding plate functions to cast a shadow region so that a line sensor receives an image producing a particular defined image data output, generally speaking a dark image representing an absence of light from an illuminator. When an inspection target optical member is inserted in the light path to intersect that shadow region, the line sensor produces the same image data in the event that there is no defect in the optical member. However, a defect in the optical member will enable light from outside that shadow region to be diffused to impinge on the line sensor thereby producing a change in the image data output. Evaluation of the change in the image data output can provide an indication of the degree of defectiveness.

REFERENCES:
patent: 5216481 (1993-06-01), Minato
patent: 5767961 (1998-06-01), Nishikawa et al.
patent: 5828500 (1998-10-01), Kida et al.
patent: 5835207 (1998-11-01), Sugiura et al.
patent: 5847822 (1998-12-01), Sugiura et al.

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