Imaging apparatus and method adapted to control ink droplet volu

Details Imaging apparatus and method adapted to control ink droplet volu Imaging apparatus and method adapted to control ink droplet volu

1999-06-04

2000-08-29

Barlow, John

Incremental printing of symbolic information

Ink jet

Ejector mechanism

347 15, B41J 205, B41J 2205

Patent

active

061097322

ABSTRACT:
Imaging apparatus and method adapted to control ink droplet volume and void formation. The apparatus includes an ink jet print head having a nozzle for ejecting an ink droplet therefrom. A heater element is in heat transfer communication with the ink droplet for variably supplying heat energy to the ink droplet, so that the volume of the ink droplet is controlled as the heat energy is variably supplied to the ink droplet. A controller is connected to the heater element for variably controlling the heat energy supplied to the ink droplet. The controller variably controls the heat energy by variably controlling a plurality of voltage pulses sequentially supplied to the heater element. Moreover, in order to reduce the potential for void formation in the ink droplet, the pulses are spaced-apart by a predetermined delay interval. Suitable control of ink droplet volume and delay interval between pulses results in uniform print density and "gray-scaling" of each dot or pixel in the output image and also precludes void formation.

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U.S. Pat. Application Ser. No. 08/783,256 titled "Ink Jet Printhead For Multi-Level Printing" filed Jan. 14, 1997 by Xin Wen.

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