Patent ID: 6304825
Filing Date: 2001-10-16
Classification: G03G,H04N

Abstract:
A rotary encoder error compensation system for use in a marking device with a rotary encoder configured to generate an encoder signal indicating a detected position of a rotating element, the rotary encoder and rotating element forming a pair having a known rotary encoder error, the system comprising:a memory that stores an amplitude and phase of the known rotary encoder error;an error correction logic circuit that receives the encoder signal from the rotary encoder; andan error correction table linked to the error correction logic circuit, the table having normalized error correction values that are sine wave values;wherein the error correction logic circuit accesses the error correction table based on the detected position of the rotating element and the corresponding phase of the known rotary encoder error and obtains one of the normalized error correction values corresponding to the detected position of the rotating element and the known rotary encoder error, the error correction logic circuit generating a corrected encoder signal based on the encoder signal received from the rotary encoder and the normalized error correction value.