Hewlett-packard Company

Josep Tarradas

Robert Warren Beauchamp

Isidre Rosello Martos

Robert A Boeller

Thomas J Halpenny

Light emitted from an obliquely angled LED source is directed by peripheral light tube walls which extend vertically toward media displaying printed indicia. The emitted light provides an illuminated area surrounding the printed indicia, while the light tube walls shield the printed indicia from excessive external light, so that a sensor measures the intensity of emitted light directly reflected from the media through a protective aperture.

Calibration technique for test patterns from multiple color inkjet printheads

Optical path optimization for light transmission and reflection in a

A method of monitoring and controlling the quality of pen markings on a plotting medium by qualifying each pen based on optically sensing across a sample line drawn on an actual medium. During each subsequent plotting task of a particular pen which has been qualified, an actual line plot is optically sensed across a selected point to make a comparison with the sample line. If the actual line plot is unsatisfactory, the deficient pen is replaced and the plot is restarted from the beginning, or retraced from the last good verification, or is stopped to allow the user to select an appropriate corrective procedure.

Growing community of inventors

Banyoles, Spain

Josep Tarradas