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US 2008/0173802 A1Published application
Encoder
AssigneeHewlett-Packard Development Company, L.P.
InventorSean Chiu
Life of this patent
Estimating the term…
Abstract
Embodiments of an encoder are disclosed.
Claims20
An encoder comprising:
- a code strip having a first resolution;
- one or more light emitters;
- an array of optical sensors having a second resolution;
- and,
- a hardware circuit to output unique encoder states based on outputs of the optical sensors at a resolution equal to the second resolution,
- wherein the second resolution is greater than the first resolution.
3 more elements
A printing device comprising:
- a carriage;
- a printing mechanism on the carriage, the carriage movable along a first dimension with respect to a media sheet that is movable in a second dimension perpendicular to the first dimension;
- and,
- a digital encoder to track movement of the printing mechanism in the first dimension, the digital encoder having a resolution provided without interpolation by a hardware circuit and that is greater than a resolution of a code strip of the digital encoder.
1 more element
A method comprising:
- relatively moving an array of optical sensors past a code strip having a plurality of interleaved dark regions and light regions, such that the optical sensors are in motion and the code strip is stationary or the optical sensors are stationary and the code strip is in motion;
- each of the optical sensors detecting light based on whether a light region of the code strip or a dark region of the code strip is incident to the optical sensor;
- performing one or more operations in hardware to output unique digital encoder states based on outputs of the optical sensors at a resolution equal to a resolution of the array,
- wherein the code strip has a resolution less than the resolution of the array.
1 more element
Dependencies are inferred from the claim text.