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1. (WO2018199922) ENCODER PROVIDING ERROR DETECTION

Pub. No.:    WO/2018/199922    International Application No.:    PCT/US2017/029304
Publication Date: Fri Nov 02 00:59:59 CET 2018 International Filing Date: Wed Apr 26 01:59:59 CEST 2017
IPC: H05K 10/00
G01D 5/12
G05B 19/048
Applicants: HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P.
Inventors: GRANADOS ASENSIO, Vicente
BRUGAROLAS, Luis Miguel
ZAMORANO, Juan Manuel
Title: ENCODER PROVIDING ERROR DETECTION
Abstract:
Movement detection circuitry is provided for a moveable component of an apparatus having an encoder member having a plurality of spaced regions to cause a response by a first detector and a second detector on the moveable component. First and second detection signal detection signals are received respectively from the first detector and second detector by processing circuitry of the movement detection circuitry. At least one of the first detection signal and the second detection signal is sampled when the first detector and second detector move relative to the encoder member. An error due to any impairment to one the spaced regions of the encoder member is based upon a comparison between the samples from the two detectors. A movement characteristic of the moveable component is determined by the processing circuitry from at least one of the first detector samples and the second detector samples.