Matrix encoder for resistive sensor arrays

Details Matrix encoder for resistive sensor arrays Matrix encoder for resistive sensor arrays

G - Physics

06

G

354/22, 354/70

G06G 7/48 (2006.01) G08C 15/08 (2006.01) H03M 1/22 (2006.01)

Patent

CA 1157158

44 48,773 ABSTRACT OF THE DISCLOSURE An encoder includes an array of variable resistance photosensors responsive to variations of incident illumination. The array is interconnected in a row and column matrix having row inputs connected to a sampling control device for sequen- tial application of a predetermined voltage to the inputs. The matrix column outputs are connected to a detecting circuit having a current-measuring detector for receiving sensing currents from the outputs and for producing current responsive detection signals in response to the application of the pre- determined voltage at the inputs. The outputs are held at a constant voltage, thereby providing effective isolation between the column outputs and eliminating interaction between elements connected to adjacent columns without the need of additional isolation means, such as isolation diodes, at each matrix intersection.

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