Method and an apparatus for illuminating points on a medium
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United States of America Patent
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Nov 26, 1996
Grant Date -
N/A
app pub date -
Nov 28, 1994
filing date -
May 26, 1992
priority date (Note) -
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Abstract
A method and apparatus for the illumination of points on a medium by illuminating a plurality of perforations that are arranged parallel to the medium with light having a center wavelength .lambda.. The perforations have a cross-section so as to provide for each perforation a diverging bundle of rays formed by defracting the light. The medium is positioned from the perforations at substantially the transition of the diverging bundle of rays between the Fresnel region and the Fraunhofer region.
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