High resolution compass card position decoder

Details High resolution compass card position decoder High resolution compass card position decoder

1982-03-04

1983-11-15

Little, Willis

Geometrical instruments

Indicator of direction of force traversing natural media

Magnetic field responsive

33355R, 33125C, G01C 1728

Patent

active

044147546

ABSTRACT:
The angular position of a compass card or like rotary encoder disk includes the utilization of an optical pickoff system in which the accuracy associated with a digitally encoded disk is enhanced through the utilization of a secondary analog optical pickoff system in which the outer periphery or border of the disk carrying the digital code is provided with a series of skewed lines running at an angle to the radius of the disk. A mask having a narrow slot is located to one side of the disk along the radius of the disk. A light source is positioned on the other side of the disk, and a linear array of detectors is positioned above the slot. The use of the skewed lines and slot amplifies the motion of the rotary encoder disk such that fine angular orientation may be detected by virtue of the position along the length of the slot of a line within the slot aperture.

REFERENCES:
patent: 3480788 (1969-11-01), Barbieri et al.
patent: 3772502 (1973-11-01), Fowler
patent: 4109389 (1978-08-01), Balcom et al.
patent: 4117602 (1978-10-01), Lapeyre

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