Dark view inspection system for transparent media
AssigneeImage Processing Systems, Inc.
InventorsAdam Weiss, Alexandre Obotnine
Life of this patent
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Abstract
Apparatus and a method for the detection and identification of light diverting and transparent defects with optical properties in a transparent medium. The apparatus has a light source with an aperture stop, a lens system focusing an image of the aperture stop at a plane, and means to pass the transparent medium through said column of light. The apparatus and method provide dark view images of the defects. The apparatus and method may be combined with a viewing area inspection system. The transparent medium may be curved, and especially face plates for cathode ray tubes.
Claims57
Apparatus for the detection and identification of light diverting and transparent defects with optical properties in a transparent medium, comprising:
- a circularly symmetrical illumination source including a light source of extended length and width and a circular aperture stop located at said light source;
- a lens system to form a column of circularly symmetrical light from light provided by said illumination source and to focus said column of circularly symmetrical light and an image of said aperture stop at a plane;
- an optical recording device located at said and aperture stop image;
- and
- means to pass said transparent medium through said column of circularly symmetrical light.
A method for detection and identification of light diverting and transparent defects with optical properties in a transparent medium, comprising:
- a) passing said transparent medium through a column of circularly symmetrical light provided by a circularly symmetrical illumination source including a source of light and a circular aperture stop;
- b) focusing said column of circularly symmetrical light at a plane, an image of said aperture stop also being focused at said plane;
- and
- c) recording light diverted by a light diverting and transparent defect with optical properties in said transparent medium using an optical recording device positioned at said aperture stop image.
Apparatus for the detection and identification of light diverting and transparent defects with optical properties in a transparent medium, comprising:
- a) first and second illumination sources of extended length and width, each illumination source providing a column of light, said second illumination source including a light source and a circular aperture stop located at said light source, the column of light provided by said second illumination source being circularly symmetrical;
- b) a first optical recording device associated with the first illumination source and a second optical recording device associated with the second illumination source;
- c) means to pass said transparent medium through each column of light;
- and
- d) a lens system to focus the column of circularly symmetrical light provided by said second illumination source at a plane, an image of said aperture stop also being focused at said plane, said second optical recording device being located at said aperture stop image.
A method for the detection and identification of defects in a transparent medium, comprising:
- a) passing said transparent medium through first and second columns of light, one of said columns of light being circularly symmetrical;
- b) focusing the first column of light at a first optical recording device and focusing the second column of light at a second optical recording device;
- c) recording images of said transparent medium at said first and second optical recording devices;
- and
- d) combining said images for detection and identification of the defects.
An apparatus for detecting defects in a transparent medium comprising:
- a circularly symmetrical diffused illumination source including a light source and a circular aperture stop, said illumination source providing a generally even distribution of light;
- a lens system forming a column of circularly symmetrical light from said even distribution of light and focusing said column of circularly symmetrical light as well as an aperture stop image at a plane;
- an optical recording device located at said aperture stop image;
- and
- a conveyor passing a transparent medium through said column of circularly symmetrical light, said optical recording device capturing images of defects in said transparent medium as a result of light beams in said column of circularly symmetrical light diverted by said defects.
An apparatus for detecting defects in a transparent medium comprising:
- a circularly symmetrical diffused illumination source including a light source and a plurality of circular aperture stops at spaced locations relative to said light source, said illumination source providing a generally even distribution of light;
- a lens system forming a column of circularly symmetrical light from said even distribution of light and focusing said column of circularly symmetrical light as well as aperture stop images at a plane;
- an optical recording device located at each said aperture stop image;
- and
- a conveyor passing a transparent medium through said column of light, each said optical recording device capturing images of defects in said transparent mediums as a result of light beams in said column of light diverted by said defects.
Dependencies are inferred from the claim text.