Absolute encoder

Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system

Reexamination Certificate

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Reexamination Certificate



An apparatus having a code strip carrier that is illuminated by an illumination system and a plurality of read heads is disclosed. Each code track includes a plurality of dark and light stripes. Each read head is positioned to detect light from a corresponding one of the code tracks as that code track moves relative to the read head, the read head generating a signal indicative of the intensity of light reaching that read head. One of the code tracks includes a first absolute position track that provides an indication of the absolute position value when the code strip carrier is at each of a plurality of predetermined absolute positions relative to the origin position. A different one of the code tracks includes an incremental position track for generating a digital value indicative of a displacement of the code strip carrier relative to the last predetermined absolute position.

patent: 4463089 (1984-07-01), Bouldin
patent: 5210409 (1993-05-01), Rowe
patent: 5936236 (1999-08-01), Setbacken et al.
patent: 6093928 (2000-07-01), Ohtomo et al.


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