Ink jet printing apparatus
AssigneeRicoh Company, Ltd.
InventorMinoru Ameyama
Life of this patent
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Abstract
A charge deflection type ink jet printing apparatus adjusts, in detecting and controlling a deflection of charged ink droplets, the size (height or width) of characters with utmost accuracy by varying the number of guard droplets. In combination with the adjustment by the variation in the number of guard drops, the direction of ejection of an ink jet head and/or the position of a deflection detecting electrode may be adjusted.
Claims5
An ink jet printing apparatus including an ink jet head, vibrator means for applying pressure oscillation to ink in the ink jet head thereby causing the ink to be ejected from the ink jet head and separated into droplets, charging means for charging the ink droplets and deflection means for deflecting the charged ink droplets, characterized by comprising:
- control means for controlling a size of images printed by the printing apparatus, the control means comprising coarse control means for adjustably moving at least one of the ink jet head, charging means and deflection means and fine control means for varying the number of guard drops composed of uncharged ink droplets between charged ink droplets.
Dependencies are inferred from the claim text.