Interdial compensation technique for angular position detectors
AssigneeCain Encoder Company
InventorThomas D. Wason
Life of this patent
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Abstract
A transducer formed of one or more electrode arrays is positioned in confronting relation and parallel to the plane of rotation of one or more rotating members. A binary interdial compensation value is generated to correct for errors in the mechanical misalignments of certain ones of the rotating members which would normally lead to ambiguities in the dial readings.
Claims8
In a device for remotely reading the position of a plurality (n) of continuously movable position indicators representing less significant and more significant digits in any number system, movement of any more significant of two adjacent indicators being in a ratio of 1/N to the less significant of the two adjacent indicators where N is the base of the number system employed, a method of interdial compensation for minimizing the effect of errors in the apparent positions of the indicators comprising:
- (a) sensing the readings of the least significant of said indicators to the nearest digit of the N-based numbering system;
- (b) in ascending sequence starting with the least significant indicator and storing the compensated reading from each less significant indicator, if any, in a storage means;
- (c) for each reading after the first, with adding means, adding a variable compensation value to the apparent value of the indicator being read based on a cumulative compensation value from the previous adjusted values of all lesser significant indicator, which tend to make the reading from each indicator one which falls exactly halfway between two adjacent integers on the more significant indicator being read responsive to the compensated value from all the previous less significant indicators;
- (d) outputting the compensated value from each indicator as data.
In a device for remotely reading the positions of a plurality (n) of continuously movable position indicators representing less significant and more significant digits in any number system, movement of any more significant of two adjacent indicators being in a ratio of 1/N to the less significant of the two adjacent indicators where N is the base of the number system employed, a method of interdial compensation for minimizing the effect of errors in the apparent positions of the indicators by:
- (a) generating a number called an interdial compensation value from the readings of all less significant dials;
- (b) adding said number to the numerical reading of the dial being addressed to obtain a compensated reading;
- (c) outputting said compensated reading as data.
Dependencies are inferred from the claim text.