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US 2002/0158927 A1Published application
Ink jet device that ejects ink droplets having different volumes
AssigneeBrother Kogyo Kabushiki Kaisha
InventorMasatomo Kojima
Life of this patent
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Abstract
As shown in FIG. 3, three types of ink droplets, i.e., ink droplets 40, 41, and 42 having a larger volume in this order, is ejected from a single nozzle 16. Because ejection speed decreases as the volume of the ink droplet decreases, a smaller ink droplet will take a flight time to reach a recording sheet than a larger ink droplet. Ejecting the smaller ink droplet at a timing earlier than the larger ink droplet can control the impact position of the smaller ink droplet as shown in FIG. 8, thereby preventing displacement of impact position on the recording sheet.
Claims5
An ink ejection device comprising:
- a cavity plate formed with a pressure chamber and a nozzle;
- an actuator that fluctuates an internal pressure of the pressure chamber to eject an ink droplet from the nozzle onto a recording medium;
- and
- a driving unit that selectively outputs a driving signal to the actuator, wherein
- the actuator fluctuates the internal pressure in response to the driving pulse;
- and
- the driving unit outputs the driving signal for ejecting a smaller ink droplet at a first timing earlier than a second timing for a larger ink droplet.
4 more elements
Dependencies are inferred from the claim text.