Two stage quadrature incremental encoder

Details Two stage quadrature incremental encoder Two stage quadrature incremental encoder

G - Physics

08

C

340/137.4

G08C 21/00 (2006.01) G05B 19/23 (2006.01)

Patent

CA 2032539

ABSTRACT OF THE DISCLOSURE An incremental position encoder and method are disclosed herein for a close loop position control system, for example, for positioning a printing device in an electronic postage meter. The incremental position encoder and method includes three chan- nels, first and second of which provide signals for coarse posi- tion determination and first or second and third of which provide signals for fine position determination. The signals of the first and second channels are 90° out of phase, i.e., they are in quadrature, and the signals of the third channel are in 90° out of phase with the second signal and 180° out of phase with the first signal. The second and third signals are used to determine fine position. The encoder includes an encoder wheel having first series and second series of slotted openings for two of the channels, and a third series of narrower width slotted openings for the third channel. The width of slots of the third series is exactly 1/2 the width of slots of the first and second series, and the slots of the third series are positioned to lie exactly in the center of the width of slots of either the first or the second series. The slotted openings of the first and second series are radially spaced from each other and offset by 90°. The slotted openings of the third series are radially spaced in- wardly from the slotted openings of the second series of openings and are offset from the first series by 180° and from the second series by 90°. Optical sensors sense the presence of the open- ings at respective reference points and provide the three signals described above.

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