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Photoelectric measuring system

  • US 4,778,273 A
  • Filed: 10/19/1987
  • Issued: 10/18/1988
  • Est. Priority Date: 05/09/1984
  • Status: Expired due to Term
First Claim
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1. In a device for photoelectrically generating electrical signals in a measuring system of the type comprising a graduation carrier, a scanning plate mounted to move relative to the graduation carrier at a defined scanning distance from the graduation carrier, an illuminating arrangement, at least one photosensor, and an evaluating unit coupled to the photosensor, the improvement comprising:

  • at least one graduation comprising a plurality of periodic grids;

    means for deriving a plurality of periodic signals from the periodic grids; and

    means for combining the plurality of periodic signals to generate a resultant signal;

    each of the grids defining a selected grid characteristic so that the resultant signal is generated with a predetermined waveform to reduce sensitivity to fluctuations in scanning distance.

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