Segmented charge tunnel for drop charging in a printhead

Details Segmented charge tunnel for drop charging in a printhead Segmented charge tunnel for drop charging in a printhead

1993-12-07

1996-06-04

Barlow, Jr., John E.

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 80, 347 81, B41J 2115

Patent

active

055237789

ABSTRACT:
A segmented charge tunnel for ink jet printing having a plurality of individual segments is utilized to sequentially apply charges to a droplet stream. Precise location of the stream break-off point within the tunnel is accomplished by identifying which one of the segments of the charge tunnel is associated with the detection of a maximum charge by a downstream sensor. Precise determinations of the distance between the break-off point and the detection downstream permits accurate droplet flight time measurement to allow ink composition and spacing to be controlled.

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patent: 4638326 (1987-01-01), Yamada et al.

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