Driving method for an ink ejection device to enlarge print dot d

Details Driving method for an ink ejection device to enlarge print dot d Driving method for an ink ejection device to enlarge print dot d

1996-08-30

2000-05-09

Barlow, John

Incremental printing of symbolic information

Ink jet

Controller

B41J 2938

Patent

active

060593938

ABSTRACT:
In order to enlarge print dot diamter and to obtain an excellent print quality, two droplets are ejected successively at different speeds so that the two droplets merge before individually impinging against a sheet of paper. To this end, a first pulse signal A is applied to an actuator to thereby eject a first droplet at a first speed and thereafter a second pulse signal B is applied thereto to thereby eject a second droplet at a second speed faster than the first speed. The two droplets are merged during flying and the merged droplet forms a print dot on the sheet of paper. The print dot obtained when the flight time was shorter than 100 .mu.sec is larger by 20% than that obtained when the flight time was longer than 100 .mu.sec. The flight time can be adjusted by changing a time difference between the falling edges of the first and second pulse signals A and B.

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