Apparatus and method for calibrating a scanner with a document feeder
AssigneeHewlett-Packard Development Company, L.P.
InventorsPaul K. Mui, Eric L. Andersen, Russell A. Mendenhall
Life of this patent
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Abstract
An apparatus and method for calibrating a scanner connected to a document feeder are provided. In one embodiment, the apparatus includes a calibration strip attached to a rotatable wheel assembly disposed within the document feeder. A cam is provided to rotate the wheel assembly and expose the calibration strip to the field of view of a head assembly of the scanner for calibration. The cam is configured to then rotate the wheel assembly in the opposite direction, so that the calibration strip is no longer exposed to the head assembly. A cleaning blade may be provided to wipe the calibration strip as it is moved to its non-exposed position.
Claims18
Apparatus for calibrating the scanner head assembly in an image-capturing device of the type which includes a scanner head assembly and a document feeder for scanning an image, the apparatus comprising
- a calibration member disposed within the document feeder, the calibration member being movable to a position within an optical path of the scanner head assembly when the scanner head assembly is ready for scanning.
Apparatus for calibrating a scanner in an image-capturing device, the apparatus comprising:
- a feeding mechanism for moving a document through a document feeder;
- a guiding mechanism for guiding the document into an optical path of a scanner head assembly to capture an image on the document;
- and,
- a calibration member adapted to be movably positioned in the optical path of the scanner head assembly when the scanner head assembly is in a scan position, so that the scanner can be calibrated without the scanner head assembly moving from the scan position.
Method of calibrating a scanner in an image-capturing device having a scanning head assembly and a connected document feeder, the method comprising the steps of:
- moving the scanning head assembly to a scanning position;
- shifting a calibration strip into an optical path of the scanning head assembly while the scanning head assembly is in the scanning position;
- and
- scanning the calibration strip.
Apparatus for calibrating an image-capturing device of the type which includes a document feeder having a pickup mechanism coupled to a motor for feeding paper in a designated paper path substantially surrounding a cylindrical guide, the feeder being connected to an image-capturing device having a head assembly which in a first designated location scans the paper as the paper travels in the paper path, the apparatus comprising:
- a wheel assembly disposed within the cylindrical guide and rotatingly connected to a fixed central axis for reciprocating motion between first and second positions, the wheel having a curved outer surface;
- a calibration strip attached to the outer surface of the wheel such that when the wheel is in the first position the calibration strip is in an optical path of the scanner head in the first designated location, the calibration strip being adapted to calibrate an image-capturing device when scanned by the device;
- a cam in abutting engagement with the wheel for urging the wheel to rotate into the first or second position;
- a cam pivot connected to the cam and rotatingly coupled to the motor for rotating the cam;
- and,
- a biasing member connected to the cam and to a fixed stop within the cylindrical guide, the biasing member being configured to urge the wheel to rotate into abutment with the cam so as to retain the wheel in either the first or second position.
Dependencies are inferred from the claim text.