Absolute digital position encoder with multiple sensors per trac

Details Absolute digital position encoder with multiple sensors per trac Absolute digital position encoder with multiple sensors per trac

1994-02-25

1996-05-21

Williams, Howard L.

Coded data generation or conversion

Digital pattern reading type converter

Having combined coding pattern

341 11, H03M 122

Patent

active

055193935

ABSTRACT:
A method and apparatus to convert absolute angular or linear position to digital information utilizes a ternary coding scheme. The code is arranged along a single track. Sensors placed at essentially equal intervals distinguish three states per position. The sensor outputs are converted from ternary to binary data by combinatorial logic. The sensors may be mechanical contacts, optical detectors, magnetic detectors, or capacitive detectors. Such an encoder may be used as a potentiometer, multiposition switch replacement, shaft encoder, or length measurement device.

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EECO Catalog p. 545 showing PCB switches.
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Gilbert, E. N. "Gray Codes and Paths on the n-Cube", Bell Systems Tehnical Journal, May, 1958, pp. 815-826.
Ruskey, Frank et al. "Generating Necklaces", J. of Algorithms 13, 1992, pp. 414-430.
Stewart, Ian; "Game, Set & Math", Oxford Press, Cambridge, Massachusetts; 1989; pp. 42-54.

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