Hewlett-packard Company

Brian P Canfield

Frank Drogo

Ronald Albert Askeland

Clayton L Holstun

Kenneth J Courian

Jaime H Bohorquez

Susan Tousi

A method of operating a thermal inkjet printer having a thermal inkjet printhead that includes the steps of selecting an ink drop volume, selecting a pulse width that will cause the thermal inkjet printhead to deposit an ink drop having the selected drop volume, and operating the thermal inkjet printhead with the selected pulse width and at an operating energy that is greater than a turn-on energy of the printhead for the selected pulse width.

Control of ink drop volume in thermal inkjet printheads by varying the

An inkjet printer system fires smaller ink droplets in a single-pass print mode to achieve addressible print resolution of 600 dpi in the carriage scan axis along with 300 dpi resolution in the media advance axis, without having to employ any dot-depletion algorithms. In one embodiment, the system provides a fast print mode which prints the smaller drops of ink on a 300 dpi grid in the carriage scan axis. In another embodiment, the system provides a single-pass color print mode wherein primary colors are printed with two color droplets of the same primary color in two adjacent sub-pixels on the 300.times.600 grid, and secondary colors are printed with two color droplets of different primary colors in two adjacent sub-pixels on the 300.times.600 grid.

Inkjet printer with increased print resolution in the carriage scan axis

Method for increased print resolution in the carriage scan axis of an

An inkjet printer has a pen holder for removably holding an ink pen, a detector circuit for detecting whether ink with a degraded quality is likely to be ejected by said ink pen, and a servicing circuit responsive to said detector circuit for causing an initial quantity of ink to be discharged from said ink pen to ensure that ink with a degraded quality will not be used during normal printing.

Servicing a newly-installed ink pen to eliminate uneven print quality

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Barcelona, Spain

Brian P Canfield