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Optical low pass filter

  • US 4,998,800 A
  • Filed: 04/03/1989
  • Issued: 03/12/1991
  • Est. Priority Date: 04/04/1988
  • Status: Expired due to Term
First Claim
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1. An imaging device comprising:

  • an objective lens;

    a solid state image sensor having formed thereon a plurality of picture elements having a periodicity;

    a diffraction grating disposed between the objective lens and the solid state image sensor, said diffraction grating projecting an image having a periodicity onto the solid state image sensor by the objective lens, wherein the periodicity of the projected image of the diffraction grating is selected to be twice or 1/n of the periodicity of the picture elements, wherein n represents an integer.

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